{"id":1859,"date":"2026-07-03T19:05:40","date_gmt":"2026-07-03T11:05:40","guid":{"rendered":"https:\/\/cnbygele.com\/blog\/static-var-compensator-working-principle-explained\/"},"modified":"2026-07-08T12:01:40","modified_gmt":"2026-07-08T04:01:40","slug":"static-var-compensator-working-principle-explained","status":"publish","type":"post","link":"https:\/\/cnbygele.com\/ru\/blog\/static-var-compensator-working-principle-explained\/","title":{"rendered":"\u041f\u0440\u0438\u043d\u0446\u0438\u043f \u0440\u0430\u0431\u043e\u0442\u044b \u0441\u0442\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u043a\u043e\u043c\u043f\u0435\u043d\u0441\u0430\u0442\u043e\u0440\u0430"},"content":{"rendered":"<div class=\"cnbyg-article\" style=\"max-width:820px;margin:0 auto;\">\n<p style=\"margin:0 0 16px;line-height:1.7;\">The <strong>static var compensator working principle<\/strong> is based on electronically controlled reactive power exchange to support voltage and improve power factor under varying loads. This guide focuses on practical evaluation steps for U.S. industrial and commercial buyers\u2014measurement, documentation, and lifecycle support\u2014not generic marketing claims. Where equipment selection is involved, cross-check public specifications on cnbygele.com and confirm project-specific limits with your utility or consulting engineer. Section checklists can be reused as RFQ attachments and commissioning handover outlines.<\/p>\n<nav style=\"background:#f7f9fb;border:1px solid #e3e8ee;border-radius:8px;padding:14px 18px;margin:0 0 24px;\">\n<p style=\"margin:0 0 16px;line-height:1.7;\"><strong>On this page<\/strong><\/p>\n<ul style=\"margin:0 0 18px 1.2em;line-height:1.7;\">\n<li style=\"margin:0 0 16px;line-height:1.7;\"><a href=\"#part-1-basic-reactive-power-exchange\">Part 1. Basic Reactive Power Exchange<\/a><\/li>\n<li style=\"margin:0 0 16px;line-height:1.7;\"><a href=\"#part-2-svg-vs-conventional-capacitor-banks\">Part 2. SVG vs Conventional Capacitor Banks<\/a><\/li>\n<li style=\"margin:0 0 16px;line-height:1.7;\"><a href=\"#part-3-control-loop-and-voltage-support\">Part 3. Control Loop and Voltage Support<\/a><\/li>\n<li style=\"margin:0 0 16px;line-height:1.7;\"><a href=\"#part-4-documentation-and-handover-checklist\">Part 4. Documentation and Handover Checklist<\/a><\/li>\n<li style=\"margin:0 0 16px;line-height:1.7;\"><a href=\"#part-5-commissioning-monitoring-and-long-term-op\">Part 5. Commissioning, Monitoring, and Long-Term Operations<\/a><\/li>\n<\/ul>\n<\/nav>\n<figure style=\"margin:26px 0;text-align:center;\"><img loading=\"lazy\" decoding=\"async\" style=\"max-width:640px;width:100%;height:auto;display:block;margin:0 auto;border-radius:8px;\" src=\"https:\/\/cnbygele.com\/wp-content\/uploads\/2026\/07\/static-var-compensator-working-principle-explained-cover-2.webp\" alt=\"Static var compensator working principle schematic concept\" width=\"640\" height=\"360\"\/><\/figure>\n<h2 id=\"part-1-basic-reactive-power-exchange\" style=\"margin:42px 0 14px;font-size:1.35em;line-height:1.3;\">Part 1. Basic Reactive Power Exchange<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Inductive loads consume reactive power and depress voltage; capacitive sources supply reactive power and raise voltage.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">A static var compensator injects or absorbs reactive power without moving mechanical parts\u2014hence &#8216;static&#8217;.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Reactive power does not perform useful work at the load, but it still flows through conductors and transformers, increasing losses and apparent power.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Compensators exchange reactive power with the grid or load to improve power factor and support local voltage.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Understanding whether your load is inductive-dominated or capacitive-dominated guides whether you need to inject or absorb reactive power.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Capture nameplate data, single-line drawings, and utility interconnection rules in the RFQ package to reduce back-and-forth during technical review.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">If your site mixes linear motors and nonlinear electronics, treat harmonic and reactive targets as linked requirements rather than separate purchases.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Define acceptance criteria before shipment\u2014power factor, step response, or THD at agreed load points\u2014so commissioning disputes are less likely.<\/p>\n<div class=\"tip-box\" style=\"border-left:4px solid #2e7d32;background:#f3faf4;padding:12px 16px;margin:0 0 18px;line-height:1.7;\"><strong>Tip:<\/strong> Think of reactive power as the magnetic field energy needed by motors and transformers.<\/div>\n<h2 id=\"part-2-svg-vs-conventional-capacitor-banks\" style=\"margin:42px 0 14px;font-size:1.35em;line-height:1.3;\">Part 2. SVG vs Conventional Capacitor Banks<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Capacitor banks provide step-wise compensation; <a href=\"https:\/\/cnbygele.com\/product\/svg-static-var-generators-2\/\">SVG systems<\/a> adjust output continuously and can mitigate certain harmonics.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Step-wise <a href=\"https:\/\/cnbygele.com\/product\/bsmjparallel-series-self-healing-low-voltage-parallel-capacitors\/\">low-voltage capacitor banks<\/a> switch in discrete kvar steps; continuous devices such as <a href=\"https:\/\/cnbygele.com\/product\/svg-static-var-generators-2\/\">SVG product line<\/a> track fast-changing reactive demand.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Hybrid schemes may combine stepped capacitors for base load and dynamic stages for fluctuating segments.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Protection and switching transients must be reviewed so compensation does not conflict with existing breakers or fuses.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Capture nameplate data, single-line drawings, and utility interconnection rules in the RFQ package to reduce back-and-forth during technical review.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">If your site mixes linear motors and nonlinear electronics, treat harmonic and reactive targets as linked requirements rather than separate purchases.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Define acceptance criteria before shipment\u2014power factor, step response, or THD at agreed load points\u2014so commissioning disputes are less likely.<\/p>\n<table style=\"width:100%;border-collapse:collapse;margin:0 0 20px;\">\n<thead>\n<tr>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f4f7fa;text-align:left;\">Technology<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f4f7fa;text-align:left;\">Response<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f4f7fa;text-align:left;\">Best for<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Capacitor + controller<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Step switching<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Stable, moderate loads<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">SVG \/ STATCOM<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Continuous, fast<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Welding, cranes, renewables<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Hybrid<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Combined<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Mixed industrial plants<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<figure style=\"margin:26px 0;text-align:center;\"><img loading=\"lazy\" decoding=\"async\" style=\"max-width:640px;width:100%;height:auto;display:block;margin:0 auto;border-radius:8px;\" src=\"https:\/\/cnbygele.com\/wp-content\/uploads\/2026\/07\/static-var-compensator-working-principle-explained-body-2.webp\" alt=\"static var compensator working principle \u2014 CNBYG product in industrial power facility (illustrative)\" width=\"640\" height=\"360\"\/><\/figure>\n<h2 id=\"part-3-control-loop-and-voltage-support\" style=\"margin:42px 0 14px;font-size:1.35em;line-height:1.3;\">Part 3. Control Loop and Voltage Support<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Controllers monitor bus voltage or power factor and adjust reactive output to maintain setpoints.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Poor tuning can cause hunting\u2014work with the manufacturer on controller settings during commissioning.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Control algorithms typically regulate power factor, bus voltage, or a combination\u2014tuning should follow manufacturer guidance and site measurements.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Commissioning should verify stable response without hunting when production lines start and stop.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">For plants with both distortion and reactive issues, evaluate <a href=\"https:\/\/cnbygele.com\/solution\/power-quality-system\/\">integrated power quality solutions<\/a> rather than treating symptoms separately.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Capture nameplate data, single-line drawings, and utility interconnection rules in the RFQ package to reduce back-and-forth during technical review.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">If your site mixes linear motors and nonlinear electronics, treat harmonic and reactive targets as linked requirements rather than separate purchases.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Define acceptance criteria before shipment\u2014power factor, step response, or THD at agreed load points\u2014so commissioning disputes are less likely.<\/p>\n<div class=\"tip-box\" style=\"border-left:4px solid #2e7d32;background:#f3faf4;padding:12px 16px;margin:0 0 18px;line-height:1.7;\"><strong>Tip:<\/strong> Keep as-built single-line diagrams updated after any feeder changes.<\/div>\n<div class=\"warning-box\" style=\"border-left:4px solid #f9a825;background:#fffbf0;padding:12px 16px;margin:0 0 18px;line-height:1.7;\"><strong>Important:<\/strong> Over-compensation can raise voltage above acceptable limits on lightly loaded feeders.<\/div>\n<h2 id=\"part-4-documentation-and-handover-checklist\" style=\"margin:42px 0 14px;font-size:1.35em;line-height:1.3;\">Part 4. Documentation and Handover Checklist<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Industrial acceptance should not rely on energization alone\u2014documentation proves ratings, safety, and maintainability for the next maintenance cycle.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Use the tables below as a starting RFQ checklist; your utility or EPC contract may require additional items.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">For product-specific datasheets, cross-check <a href=\"https:\/\/cnbygele.com\/product\/svg-static-var-generators-2\/\">related CNBYG product pages<\/a> and request any missing type test excerpts.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Align factory acceptance tests with items your insurer or utility interconnection agreement may require.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">When comparing quotations, normalize currency, Incoterms, and included commissioning services before ranking suppliers.<\/p>\n<table style=\"width:100%;border-collapse:collapse;margin:0 0 20px;\">\n<thead>\n<tr>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f4f7fa;text-align:left;\">Document \/ item<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f4f7fa;text-align:left;\">Purpose<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f4f7fa;text-align:left;\">When to request<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Factory type test report<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Verify rated voltage, kvar, and temperature rise<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Before purchase order<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Single-line diagram template<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Panel layout and protection coordination<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Design phase<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Communication register map<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">BMS\/SCADA integration<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Before FAT\/SAT<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Spare parts list (5+ year)<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Lifecycle planning<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Contract negotiation<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Commissioning checklist<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Acceptance testing<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Before energization<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<table style=\"width:100%;border-collapse:collapse;margin:0 0 20px;\">\n<thead>\n<tr>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f4f7fa;text-align:left;\">Application<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f4f7fa;text-align:left;\">Load behavior<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f4f7fa;text-align:left;\">Typical approach<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Welding \/ crane halls<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Fast reactive swings<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">SVG or hybrid dynamic compensation<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Data center UPS<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Mixed harmonic + reactive<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Study first; may combine APF + controlled compensation<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Renewable coupling<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Variable generation<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Coordinate with inverter settings and grid code<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Stable motor plant<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Moderate step loads<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px;vertical-align:top;\">Capacitor bank + controller may suffice<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div class=\"tip-box\" style=\"border-left:4px solid #2e7d32;background:#f3faf4;padding:12px 16px;margin:0 0 18px;line-height:1.7;\"><strong>Tip:<\/strong> Store factory test reports with the panel serial number for future warranty claims.<\/div>\n<div class=\"tip-box\" style=\"border-left:4px solid #2e7d32;background:#f3faf4;padding:12px 16px;margin:0 0 18px;line-height:1.7;\"><strong>Tip:<\/strong> Confirm imperial and metric dimensions if shipping to mixed-design sites.<\/div>\n<h2 id=\"part-5-commissioning-monitoring-and-long-term-op\" style=\"margin:42px 0 14px;font-size:1.35em;line-height:1.3;\">Part 5. Commissioning, Monitoring, and Long-Term Operations<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Commissioning should verify that reactive and harmonic targets are met at the point of common coupling, not only at the compensation cabinet terminals.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Functional tests typically include step response, power factor at defined load points, and harmonic readings compared to contract or IEEE 519 guidance where applicable.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Monitoring after energization helps catch hunting, unexpected resonance, or capacitor cell failures before they affect production uptime.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Train maintenance staff on lockout\/tagout, discharge timing for capacitors, and which alarms require immediate shutdown versus scheduled service.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Schedule a post-warranty review to reassess load changes\u2014production line upgrades often change compensation needs within three to five years.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Utility account managers can clarify whether PF adjustments affect demand charges only, energy charges, or both\u2014align KPIs before writing acceptance tests.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Keep a spare-parts criticality list (fuses, contactors, fan assemblies, control boards) based on lead time and production impact, not catalog defaults alone.<\/p>\n<div class=\"tip-box\" style=\"border-left:4px solid #2e7d32;background:#f3faf4;padding:12px 16px;margin:0 0 18px;line-height:1.7;\"><strong>Tip:<\/strong> Log baseline power quality measurements after commissioning for future troubleshooting comparisons.<\/div>\n<h2 style=\"margin:42px 0 14px;font-size:1.35em;line-height:1.3;\">Recommended CNBYG Products<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7;\">For project support, explore our <a href=\"https:\/\/cnbygele.com\/contact-us\/\">related product line<\/a>, <a href=\"https:\/\/cnbygele.com\/solution\/power-quality-system\/\">power quality system options<\/a>, and <a href=\"https:\/\/cnbygele.com\/about-us\/\">OEM\/ODM capabilities<\/a> on cnbygele.com.<\/p>\n<figure style=\"margin:26px 0;text-align:center;\"><img loading=\"lazy\" decoding=\"async\" style=\"max-width:640px;width:100%;height:auto;display:block;margin:0 auto;border-radius:8px;\" src=\"https:\/\/cnbygele.com\/wp-content\/uploads\/2026\/07\/static-var-compensator-working-principle-explained-product-1.webp\" alt=\"CNBYG svg product recommendation (illustrative scene)\" width=\"640\" height=\"360\"\/><\/figure>\n<h2 style=\"margin:42px 0 14px;font-size:1.35em;line-height:1.3;\">FAQ<\/h2>\n<h3 style=\"margin:28px 0 10px;font-size:1.15em;line-height:1.35;\">How does a static var compensator regulate voltage?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7;\">An SVC controls the reactive power injected into or absorbed from the bus. When voltage is low it generates capacitive VARs; when voltage is high it absorbs inductive VARs, keeping the bus near a reference voltage (typically with a 1-4% droop).<\/p>\n<h3 style=\"margin:28px 0 10px;font-size:1.15em;line-height:1.35;\">What are TCR and TSC, and how do they work?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7;\">A thyristor-controlled reactor (TCR) is continuously variable by phase-angle firing and provides smooth control; thyristor-switched capacitors (TSC) add capacitive VARs in discrete steps. Combining them gives coarse plus smooth reactive control.<\/p>\n<h3 style=\"margin:28px 0 10px;font-size:1.15em;line-height:1.35;\">What is the difference between SVG and SVC?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7;\">An SVG (static var generator) is an IGBT voltage-source converter that actively injects a controlled compensation current, so its output is largely independent of system voltage. An SVC is impedance-based (thyristor-switched reactors\/capacitors), so its capability decreases as voltage drops.<\/p>\n<h3 style=\"margin:28px 0 10px;font-size:1.15em;line-height:1.35;\">Does a static var compensator have moving parts?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7;\">No significant moving parts other than internal switchgear. Reactive control is done electronically by thyristors, which is why it is called static.<\/p>\n<h3 style=\"margin:28px 0 10px;font-size:1.15em;line-height:1.35;\">Why does SVC capability drop as system voltage falls?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Because an SVC is impedance-based, the reactive current it can supply depends on voltage. As voltage sags, available capacitive current from the capacitor banks falls, unlike an SVG that acts as a current source.<\/p>\n<h3 style=\"margin:28px 0 10px;font-size:1.15em;line-height:1.35;\">What is the V-I droop of an SVC?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Public modeling references note a voltage droop typically between 1% and 4% at maximum reactive output, which sets the slope of the SVC&#8217;s voltage-current characteristic within its control range.<\/p>\n<h3 style=\"margin:28px 0 10px;font-size:1.15em;line-height:1.35;\">What objectives can an SVC serve besides voltage support?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7;\">Technical documentation lists improved voltage regulation, steady-state and dynamic stability, overvoltage reduction, flicker reduction, and damping of sub-synchronous oscillations.<\/p>\n<h2 style=\"margin:42px 0 14px;font-size:1.35em;line-height:1.3;\">References<\/h2>\n<ul style=\"margin:0 0 18px 1.2em;line-height:1.7;\">\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Static_var_compensator\" rel=\"nofollow noopener\" target=\"_blank\">Wikipedia \u2014 Static VAR compensator<\/a><\/li>\n<li><a href=\"https:\/\/au.mathworks.com\/help\/sps\/powersys\/ref\/staticvarcompensatorphasortype.html\" rel=\"nofollow noopener\" target=\"_blank\">MathWorks \u2014 Static Var Compensator (Phasor Type)<\/a><\/li>\n<li><a href=\"https:\/\/emtp.com\/documents\/EMTP-Documentation\/doc\/advanced\/static-var-compensator.pdf\" rel=\"nofollow noopener\" target=\"_blank\">EMTP \u2014 Static Var Compensator device (PDF)<\/a><\/li>\n<li><a href=\"https:\/\/www.ketetransformer.com\/svg-vs-svc-functions-working-principles-and-key-differences\/\" rel=\"nofollow noopener\" target=\"_blank\">Ketetransformer \u2014 SVG vs SVC working principles<\/a><\/li>\n<\/ul>\n<p style=\"margin:0 0 16px;line-height:1.7;\"><strong>Ready to discuss your project?<\/strong> Contact <a href=\"https:\/\/cnbygele.com\/contact-us\/\">CNBYG engineering support<\/a> with your voltage class, load list, and target power factor or THD goals.<\/p>\n<\/div>\n<p><script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"How does a static var compensator regulate voltage?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"An SVC controls the reactive power injected into or absorbed from the bus. When voltage is low it generates capacitive VARs; when voltage is high it absorbs inductive VARs, keeping the bus near a reference voltage (typically with a 1-4% droop).\"}}, {\"@type\": \"Question\", \"name\": \"What are TCR and TSC, and how do they work?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A thyristor-controlled reactor (TCR) is continuously variable by phase-angle firing and provides smooth control; thyristor-switched capacitors (TSC) add capacitive VARs in discrete steps. Combining them gives coarse plus smooth reactive control.\"}}, {\"@type\": \"Question\", \"name\": \"What is the difference between SVG and SVC?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"An SVG (static var generator) is an IGBT voltage-source converter that actively injects a controlled compensation current, so its output is largely independent of system voltage. An SVC is impedance-based (thyristor-switched reactors\/capacitors), so its capability decreases as voltage drops.\"}}, {\"@type\": \"Question\", \"name\": \"Does a static var compensator have moving parts?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No significant moving parts other than internal switchgear. Reactive control is done electronically by thyristors, which is why it is called static.\"}}, {\"@type\": \"Question\", \"name\": \"Why does SVC capability drop as system voltage falls?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Because an SVC is impedance-based, the reactive current it can supply depends on voltage. As voltage sags, available capacitive current from the capacitor banks falls, unlike an SVG that acts as a current source.\"}}, {\"@type\": \"Question\", \"name\": \"What is the V-I droop of an SVC?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Public modeling references note a voltage droop typically between 1% and 4% at maximum reactive output, which sets the slope of the SVC's voltage-current characteristic within its control range.\"}}, {\"@type\": \"Question\", \"name\": \"What objectives can an SVC serve besides voltage support?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Technical documentation lists improved voltage regulation, steady-state and dynamic stability, overvoltage reduction, flicker reduction, and damping of sub-synchronous oscillations.\"}}]}<\/script><br \/>\n<script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BlogPosting\", \"headline\": \"Static Var Compensator Working Principle Explained\", \"description\": \"Understand the static var compensator working principle: reactive power exchange, voltage support, SVG versus SVC, and practical notes for plant engineers.\", \"keywords\": \"static var compensator working principle\", \"inLanguage\": \"en-US\", \"author\": {\"@type\": \"Organization\", \"name\": \"CNBYG\"}, \"publisher\": {\"@type\": \"Organization\", \"name\": \"CNBYG\", \"url\": \"https:\/\/cnbygele.com\/\"}, \"mainEntityOfPage\": {\"@type\": \"WebPage\", \"@id\": \"https:\/\/cnbygele.com\/blog\/static-var-compensator-working-principle-explained\/\"}, \"url\": \"https:\/\/cnbygele.com\/blog\/static-var-compensator-working-principle-explained\/\", \"image\": \"https:\/\/cnbygele.com\/wp-content\/uploads\/2026\/07\/static-var-compensator-working-principle-explained-cover-2.webp\", \"datePublished\": \"2026-07-03\", \"dateModified\": \"2026-07-06\"}<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u041f\u0440\u0438\u043d\u0446\u0438\u043f \u0440\u0430\u0431\u043e\u0442\u044b \u0441\u0442\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u043a\u043e\u043c\u043f\u0435\u043d\u0441\u0430\u0442\u043e\u0440\u0430 \u0440\u0435\u0430\u043a\u0442\u0438\u0432\u043d\u043e\u0439 \u043c\u043e\u0449\u043d\u043e\u0441\u0442\u0438: \u043e\u0431\u043c\u0435\u043d \u0440\u0435\u0430\u043a\u0442\u0438\u0432\u043d\u043e\u0439 \u043c\u043e\u0449\u043d\u043e\u0441\u0442\u044c\u044e, \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u043d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u044f, \u0421\u0412\u0420 \u0432 \u0441\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u0438 \u0441 \u0421\u0413\u0420, \u0438 \u043f\u0440\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0437\u0430\u043c\u0435\u0442\u043a\u0438 \u043f\u043e \u0432\u044b\u0431\u043e\u0440\u0443 \u0434\u043b\u044f \u0438\u043d\u0436\u0435\u043d\u0435\u0440\u043e\u0432.<\/p>","protected":false},"author":3,"featured_media":1949,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_gspb_post_css":"","footnotes":""},"categories":[1,195],"tags":[],"class_list":["post-1859","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-news-blog"],"blocksy_meta":[],"acf":[],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/cnbygele.com\/ru\/wp-json\/wp\/v2\/posts\/1859","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cnbygele.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cnbygele.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cnbygele.com\/ru\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/cnbygele.com\/ru\/wp-json\/wp\/v2\/comments?post=1859"}],"version-history":[{"count":6,"href":"https:\/\/cnbygele.com\/ru\/wp-json\/wp\/v2\/posts\/1859\/revisions"}],"predecessor-version":[{"id":1986,"href":"https:\/\/cnbygele.com\/ru\/wp-json\/wp\/v2\/posts\/1859\/revisions\/1986"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cnbygele.com\/ru\/wp-json\/wp\/v2\/media\/1949"}],"wp:attachment":[{"href":"https:\/\/cnbygele.com\/ru\/wp-json\/wp\/v2\/media?parent=1859"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cnbygele.com\/ru\/wp-json\/wp\/v2\/categories?post=1859"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cnbygele.com\/ru\/wp-json\/wp\/v2\/tags?post=1859"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}