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Control method for triple-harmonic current of static var compensator (SVC)

A control method and harmonic current technology, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, flexible AC transmission systems, etc., can solve problems such as inability to form zero-sequence components and increase system costs

Inactive Publication Date: 2012-12-05
HUBEI SANHUAN DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The disadvantage of the first method above is that when the voltage is asymmetrical, the harmonic current with a multiple of 3 cannot form a zero-sequence component in the reactor connected in a triangle, and part of it flows into the power grid
[0014] The disadvantage of the second method above is that it increases the capacity of the third harmonic filter of the system and increases the cost of the system

Method used

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  • Control method for triple-harmonic current of static var compensator (SVC)
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  • Control method for triple-harmonic current of static var compensator (SVC)

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Embodiment

[0068] Such as figure 1 , 2 As shown, the SVC device used in the present invention includes two parts, a thyristor-controlled reactor (TCR) and a fixed capacitor bank (FC). Each phase TCR includes a reactor divided into two halves and a pair of anti-parallel thyristors connected in series. Three single-phase TCRs are connected in delta, and then connected to the power grid. In the fixed capacitor bank (FC), three single-phase capacitor banks are connected in a star shape and connected to the power grid.

[0069] Controlling the firing angle α of each phase thyristor in the TCR can control the inductive reactive current in the reactors of each phase, and also control the inductive reactive power absorbed by the TCR from the grid.

[0070] When the grid voltage fluctuates, adjusting the inductive reactive power absorbed by the SVC can keep the grid voltage relatively stable.

[0071] When the firing angle α of the thyristor changes from 90° to close to 180°, the phase curren...

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Abstract

The invention discloses a control method for triple-harmonic current of a static var compensator (SVC). The method is characterized in that a triple-harmonic current signal in thyristor controlled reactor (TCR) is used as a control quantity, when three phases of voltage are asymmetric, relevant voltage and current signal is filtered, compared, amplified, operated and modulated to obtain an instruction value of a conduction angle of a thyristor, so that the three phases of triple-harmonic current values of the TCR are controlled to be approximately symmetric, the triple-harmonic current flowing from the SVC into an electric network is close to zero, the distortion of the electric network voltage can be inhibited, and the capacity of a triple-harmonic filter and the manufacturing cost of the SVC can be reduced.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and more specifically relates to a method for controlling the third harmonic current of SVC, which is applicable to the control of the third harmonic current of SVC. Background technique [0002] When SVC is used for power grid compensation, it can maintain the stability of the node voltage of the transmission line, reduce the fluctuation of the grid voltage caused by the change of reactive power, and improve the transmission capacity of the active power of the transmission line and the static stability of the grid. In the case of grid faults, SVC can increase the system damping, suppress the power oscillation of the grid, and improve the dynamic stability of the grid. [0003] Static var compensator (SVC-static var compensator) usually consists of two parts: fixed capacitor bank (FC-fixed capacitor) and thyristor-controlled reactor (TCR-thyristor-controlled reactor). TCR can provide c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/16H02J3/01
CPCY02E40/34Y02E40/12Y02E40/10Y02E40/30Y02E40/40
Inventor 范少春梅震卢运正周俊彭建怀龚世缨
Owner HUBEI SANHUAN DEV