{"id":1552,"date":"2026-07-22T05:33:31","date_gmt":"2026-07-22T05:33:31","guid":{"rendered":"https:\/\/lstransformer.com\/harmonic-control-in-power-systems-reactor-selection-and-configuration\/"},"modified":"2026-09-26T14:14:57","modified_gmt":"2026-09-26T14:14:57","slug":"harmonic-control-in-power-systems-reactor-selection-and-configuration","status":"publish","type":"post","link":"https:\/\/www.lstransformer.com\/fr\/harmonic-control-in-power-systems-reactor-selection-and-configuration\/","title":{"rendered":"Harmonic Control in Power Systems: Reactor Selection and Configuration"},"content":{"rendered":"

Harmonic Control in Power Systems: Reactor Selection and Configuration<\/b><\/h1>\n

With the rapid development of industrial equipment, renewable energy power stations, and data centers, harmonic pollution in power systems has become increasingly severe. Harmonics not only cause transformer overheating and cable insulation aging but may also trigger serious accidents such as capacitor resonance explosions. Reactors, as the core equipment for harmonic control, directly determine the effectiveness of mitigation through their selection and configuration. This article explores how to achieve efficient harmonic control through scientific selection and systematic configuration, starting from the principles of harmonic suppression and incorporating global engineering practices.<\/p>\n

Contenu<\/span><\/b><\/h2>\n

1. Harmonic Hazards and the Suppression Principles of Reactors<\/em><\/b><\/h3>\n

1.1 Generation and Destructive Mechanisms of Harmonics<\/strong><\/i><\/h4>\n

Harmonics are voltage or current components with frequencies that are integer multiples of the fundamental frequency (50\/60 Hz), primarily generated by nonlinear loads such as variable frequency drives (VFDs), rectifiers, and LED power supplies. Their hazards include:<\/p>\n

(1) Transformer Overheating:<\/strong><\/h6>\n

Harmonic currents cause eddy current losses and stray losses. The loss formula is:<\/p>\n

\"wps9\"<\/p>\n

(2) Resonance:<\/strong><\/h6>\n

Harmonic currents interact with capacitor reactance to form resonance, leading to voltage amplification or even equipment breakdown.<\/p>\n

\"2\"<\/a><\/p>\n

1.2 Core Principles of Reactor-Based Harmonic Suppression<\/strong><\/i><\/h4>\n

Reactors suppress harmonics through two physical mechanisms:<\/p>\n

(1) Impedance Matching:<\/strong><\/h6>\n

Series reactors increase system impedance, altering the path of harmonic currents and directing them toward low-impedance filter circuits. For instance, the inductive reactance of a series reactor (\"wps10\") and capacitor reactance (\"wps11\") work together to make the system exhibit high impedance to specific harmonics, thereby preventing their flow into the grid.<\/p>\n

(2) Energy Absorption:\u00a0<\/strong><\/h6>\n

Filter reactors and capacitors form LC filters, creating low-impedance paths for targeted harmonics. For example, a 5th harmonic filter is designed with a resonant frequency of 250 Hz, where the LC circuit\u2019s impedance is minimized, actively absorbing harmonic currents and converting them into heat.<\/p>\n

(3) Case Study:\u00a0<\/strong><\/h6>\n

A German automotive factory installed a 5th harmonic filter (6% reactance rate) on the output side of a VFD, reducing 5th harmonic current from 120A to 30A and lowering transformer temperature rise by 40%.<\/p>\n

2. Key Technical Parameters for Reactor Selection<\/em><\/b><\/h3>\n

2.1 Reactance Rate Selection and Resonance Avoidance<\/strong><\/i><\/h4>\n

The reactance rate (\"wps12\"), the ratio of reactor inductive reactance to capacitor capacitive reactance, determines the resonant frequency.<\/p>\n

The resonant frequency is calculated as:
\n\"wps13\"<\/p>\n

where\"wps14\"\u00a0is the fundamental frequency.<\/p>\n

(1) 4%-7% Reactance Rate:<\/strong><\/h6>\n

\u00a0Suitable for suppressing 5th and higher-order harmonics (\"wps15\"). For example, a 6% reactance rate yields a resonant frequency of 204 Hz (corresponding to 4.08th harmonic), effectively avoiding 5th harmonic resonance risks.<\/p>\n

(2) 14% Reactance Rate:<\/strong><\/h6>\n

Targets 3rd harmonic (150Hz)scenarios, such as UPS systems in data centers. Here, the resonant frequency:<\/span><\/p>\n

\"wps16\"<\/p>\n

far from the 3rd harmonic frequency.<\/p>\n

\"4\"<\/a><\/p>\n

2.2 Current Capacity and Temperature Rise Design<\/strong><\/i><\/h4>\n
(1)\u00a0Current Capacity:<\/strong><\/h6>\n

Reactors must withstand additional thermal stress from harmonic currents. The total current capacity should satisfy:<\/p>\n

\"wps17\"
\nFor example, if the fundamental current is 100A and the\u00a05th harmonic accounts for 20%, the total current is 102A.<\/p>\n

(2) Temperature Rise Control:<\/strong><\/h6>\n

Based on the conductor resistive loss formula\"wps18\", reactors require:<\/p>\n

\u2013Insulation Class:Class B (\u226480K), Class F (\u2264100K), or Class H (\u2264125K) insulation materials to adapt to varying ambient temperatures.<\/p>\n

\u2013Cooling Structure:Natural cooling with aluminum casings or forced air cooling, matching heat dissipation area to power loss. For instance, a 100kW loss reactor requires a heat sink with a surface area \u22655m\u00b2.<\/p>\n

3. Reactor Configuration Strategies and Physical Principles<\/em><\/b><\/h3>\n

3.1 Location Selection: Centralized vs. Distributed<\/strong><\/i><\/h4>\n
(1) Centralized Configuration:<\/strong><\/h6>\n

\u00a0Reactors are installed at the transformer\u2019s low-voltage side or busbar to increase overall system impedance and suppress harmonics. The principle involves raising busbar impedance (\"wps19\"), directing harmonic currents toward low-impedance filter branches.<\/p>\n

\u2013Effect:\u00a0Suppresses 80% of wideband harmonics but cannot eliminate specific harmonics.<\/p>\n

(2) Distributed Configuration:<\/strong><\/h6>\n

Reactors are installed near harmonic sources (e.g., VFD outputs) to target specific harmonic suppression. The principle involves adjusting local impedance to block harmonic injection paths.<\/p>\n

\u2013Effect:\u00a0Achieves up to 95% suppression for characteristic harmonics like 5th and 7th but requires custom designs for each device.<\/p>\n

3.2 Parallel and Series Configuration Synergy<\/strong><\/i><\/h4>\n
(1) Parallel Reactors:\u00a0<\/strong><\/h6>\n

Compensate for reactive power and mitigate voltage fluctuations. Their principle involves offsetting capacitive reactive power with inductive currents but does not directly filter harmonics.<\/p>\n

\"5\"<\/a><\/p>\n

(2) Series Reactors:<\/strong><\/h6>\n

\u00a0Form tuned filters with capacitors to act as “harmonic absorbers” for specific frequencies. For example, a 5th harmonic filter\u2019s LC parameters satisfy:<\/p>\n

\"wps20\"<\/p>\n

At 250 Hz, the reactor and capacitor impedances are equal and opposite, minimizing total impedance and actively absorbing harmonic currents.<\/p>\n

(3) Case Study: <\/strong><\/h6>\n

A U.S. data center adopted a “7% series reactor + 5th harmonic filter” solution, reducing THDv from 12% to 2.8% and improving power factor from 0.82 to 0.98.<\/p>\n

Reactor Selection and Configuration Comparison Table<\/i><\/strong><\/i><\/p>\n\n\n\n\n\n\n\n
Scenario<\/b><\/td>\nRecommended Reactance Rate<\/b><\/td>\nConfiguration<\/b><\/td>\nHarmonic Suppression Principle<\/b><\/td>\nEffect (THDv Reduction)<\/b><\/td>\n<\/tr>\n
Industrial VFDs<\/td>\n4%-5%<\/td>\nDistributed series + 5th harmonic filter<\/td>\nBlocks 5th harmonic injection path<\/td>\n12% \u2192 4%<\/td>\n<\/tr>\n
Data Center UPS<\/td>\n14%<\/td>\nCentralized series + 3rd harmonic filter<\/td>\nAbsorbs 3rd harmonic energy<\/td>\n10% \u2192 2.5%<\/td>\n<\/tr>\n
Solar Power Plants<\/td>\n5%-7%<\/td>\nBusbar parallel + wideband filter<\/td>\nIncreases system impedance for wideband harmonics<\/td>\n9% \u2192 3%<\/td>\n<\/tr>\n
Commercial Buildings<\/td>\n6%<\/td>\nCentralized at transformer outlet<\/td>\nSuppresses multi-source harmonic overlap<\/td>\n7% \u2192 3.8%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

En R\u00e9sum\u00e9<\/span><\/b><\/h2>\n

Harmonic control fundamentally revolves around “impedance matching” and “energy diversion.” Through precise reactor selection (reactance rate, insulation class) and systematic configuration (centralized\/distributed, series\/parallel), harmonics can be effectively suppressed while avoiding resonance risks. For international users, solutions must align with grid characteristics (short-circuit capacity, environmental conditions): low-reactance centralized configurations for high short-circuit capacity scenarios, while distributed filtering is ideal for precise suppression of characteristic harmonics. Looking ahead, with the rise of broadband active filters (AFE) and smart reactors, harmonic control will enter a new era of “adaptive” and “predictive” solutions.<\/p>\n

Contact<\/strong><\/h2>\n

LuShan, heure de l'est. 1975, est un fabricant professionnel Chinois sp\u00e9cialis\u00e9 dans les transformateurs de puissance et des r\u00e9acteurs de plus de 50 ans. Les produits de pointe sont transformateur monophas\u00e9, triphas\u00e9 transformateurs d'isolement, transformateur \u00e9lectrique, transformateur de distribution, l'\u00e9tape vers le bas et d'intensifier le transformateur de basse tension du transformateur, transformateur \u00e0 haute tension, contr\u00f4le de transformateur toro\u00efdal transformateur, transformateur R-core; inductances DC, AC r\u00e9acteurs, le filtrage du r\u00e9acteur, de ligne et de charge du r\u00e9acteur, des bobines, le filtrage du r\u00e9acteur, et interm\u00e9diaire, \u00e0 haute fr\u00e9quence produits<\/a>.<\/p>\n

Nos transformateurs de puissance et les r\u00e9acteurs sont largement utilis\u00e9s dans les 10 domaines d'application: transport en commun rapide, les machines de construction, les \u00e9nergies renouvelables, intelligents de fabrication, des \u00e9quipements m\u00e9dicaux, de la mine de charbon de l'explosion de la pr\u00e9vention, de l'excitation du syst\u00e8me, frittage sous vide(four), d'une climatisation centrale.<\/p>\n

En savoir plus sur transformateur de puissance et le r\u00e9acteur: www.lstransformer.com<\/a>.<\/p>\n

Si vous souhaitez obtenir des solutions personnalis\u00e9es pour les transformateurs ou des r\u00e9acteurs, veuillez nous contacter.
\nWhatsApp\uff1a+86 13787095096
\nE-mail: marketing@hnlsdz.com<\/p>","protected":false},"excerpt":{"rendered":"

Harmonic Control in Power Systems: Reactor Selection and Configuration With the rapid development of industrial equipment, renewable energy power stations, and data centers, harmonic pollution in power systems has become increasingly severe. Harmonics not only cause transformer overheating and cable insulation aging but may also trigger serious accidents such as capacitor resonance explosions. Reactors, as […]<\/p>\n","protected":false},"author":3,"featured_media":1961,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[48],"tags":[],"class_list":["post-1552","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-faq"],"yoast_head":"\nHarmonic Control in Power Systems: Reactor Selection and Configuration - LS power transformer, Line reactor, High-voltage transformer, Oil-immersed transformer-CHANGSHA LUSHAN ELECTRONIC TECHNOLOGY CO.,LTD<\/title>\n<meta name=\"description\" content=\"With the rapid development of industrial equipment, renewable energy power stations, and data centers, harmonic pollution in power systems has become increasingly severe. 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This article explores how to achieve efficient harmonic control through scientific selection and systematic configuration, starting from the principles of harmonic suppression and incorporating global engineering practices.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.lstransformer.com\/fr\/harmonic-control-in-power-systems-reactor-selection-and-configuration\/","og_locale":"fr_FR","og_type":"article","og_title":"Harmonic Control in Power Systems: Reactor Selection and Configuration - LS power transformer, Line reactor, High-voltage transformer, Oil-immersed transformer-CHANGSHA LUSHAN ELECTRONIC TECHNOLOGY CO.,LTD","og_description":"With the rapid development of industrial equipment, renewable energy power stations, and data centers, harmonic pollution in power systems has become increasingly severe. 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