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Harmonic based on APF and SVC and reactive-load dynamic state compensating system and frequency-dividing phase-splitting electrical current control method

A comprehensive compensation and dynamic technology, applied in the direction of reactive power adjustment/elimination/compensation, harmonic reduction device, flexible AC transmission system, etc., to achieve the effect of dynamic tracking and governance

Inactive Publication Date: 2008-06-18
HUNAN UNIV
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Problems solved by technology

[0005] Aiming at the defects existing in the prior art, the present invention aims to provide a dynamic comprehensive compensation system for harmonics and reactive power based on APF and SVC, so as to realize the dynamic compensation of each harmonic current and reactive power in the medium and high voltage grid current. Real-time governance and compensation, and in order to solve the problem of large coupling between APF and SVC during operation, the present invention provides a frequency-division and phase-separation current control method used in the system. When the control method is adopted, the comprehensive compensation system is implemented Real-time and dynamic compensation of reactive power and control of harmonic current in the power grid ensure the stability of the system

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  • Harmonic based on APF and SVC and reactive-load dynamic state compensating system and frequency-dividing phase-splitting electrical current control method

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Embodiment Construction

[0017] As shown in Figure 1, the harmonic and reactive power dynamic comprehensive compensation system based on APF and SVC includes a separate injection active power filter APF, a mechanical switching capacitor MSC, and a thyristor controlled reactor TCR. Separate injection type active power filter includes active power filter and injection branch, A phase injection branch has a capacitor C 1 , Capacitance C 2 , Inductance L 1 Series connection to form a single tuning filter, capacitor C 1 , Inductance L 1 The A-phase fundamental resonant circuit is formed in series, and the active power filter passes through the output filter inductor L 0 After filtering, it is connected in parallel with the fundamental resonance circuit through the coupling transformer T, and then through the filter capacitor C 2 Connected to the grid, the other two phase injection circuits are the same as phase A. Since the series resonant LC network in the injection branch is resonantly tuned to the fundament...

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Abstract

The invention discloses a harmonic and reactive dynamic comprehensive compensation system which is based on APF and SVC, comprising an independent resonance injection active power filter APF, a thyristor controlled reactor TCR and a mechanically switched capacitor MSC. The thyristor controlled reactor TCR is arranged beside a power network; the mechanically switched capacitor MSC is arranged beside a load; the independent injection active power filter APF is arranged between the TCR and the MSC; meanwhile, a frequency-dividing and phase-separating method which is applicable to the comprehensive compensation system is disclosed. The system of the invention can implement dynamic real-time tracking compensation treatment for power network harmonic current and reactive power; the current control method which is adaptable for the system overcomes the shortage of great coupling between the APF and the TCR when a traditional ipiq method is adopted, greatly reduces the interplaying of the control performances between the TCR and the APF, thus improving the reliability and control precision of the system.

Description

Technical field [0001] The invention relates to a harmonic and reactive power dynamic comprehensive compensation system based on APF and SVC, and a frequency division and phase division current control method. Background technique [0002] Electricity is one of the key factors affecting the development of my country's industry. Electricity energy saving will occupy an increasingly important position in the process of building a conservation-oriented society in my country. In recent years, due to problems such as low power factor of distribution network harmonics and transformers and other equipment, huge economic losses have been caused to power supply and electricity users. Thanks to the development of power electronics, power conversion and other technologies, it has enabled the dynamic The active power filter, which controls harmonics and improves power factor and high-power reactive power compensation, has become one of the current research hotspots in improving power quality...

Claims

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Application Information

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IPC IPC(8): H02J3/01H02J3/18
CPCY02E40/40Y02E40/22Y02E40/12Y02E40/10Y02E40/20
Inventor 罗安赵伟帅智康雷震李强姜中华
Owner HUNAN UNIV
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