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Three-level static var generator with auxiliary voltage equalization and voltage equalization method

A static reactive power, three-level technology, applied in reactive power adjustment/elimination/compensation, instruments, electrical components, etc., can solve bus voltage overvoltage faults, increase costs, and unbalance the compensation effect of static var generators and other problems, to achieve the effect of reducing the DC bus voltage, increasing the cost, and working reliably

Active Publication Date: 2022-03-11
XIAN ACTIONPOWER ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that when the large-capacity load of the existing three-level static var generator changes suddenly, the positive and negative DC bus voltage values ​​will be unbalanced for a short time, which will affect the compensation effect of the static var generator, and even cause the bus voltage to overshoot. In view of the technical problems of voltage faults, a three-level static var generator with auxiliary voltage equalization and its voltage equalization method are proposed. The auxiliary voltage equalization control is carried out by using the auxiliary power supply circuit inside the three-level SVG, which does not increase the cost and can Realize DC bus voltage equalization

Method used

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  • Three-level static var generator with auxiliary voltage equalization and voltage equalization method
  • Three-level static var generator with auxiliary voltage equalization and voltage equalization method

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Embodiment 1

[0053]The three-level static var generator with auxiliary voltage equalization proposed by the present invention is controlled by the internal power supply of the three-level static var generator to achieve the purpose of voltage equalization, such as figure 1 As shown, it is a schematic diagram of the topological circuit structure of the three-level static var generator with auxiliary voltage equalization, including the existing three-level circuit 5 and the auxiliary voltage equalization circuit, and the auxiliary voltage equalization circuit includes the first auxiliary power supply 1 and The second auxiliary power supply 2, the first auxiliary power supply 1 and the second auxiliary power supply 2 are output in parallel through the first output diode 3 and the second output diode 4 respectively, to provide power for the internal load 6 of the three-level static var generator, The auxiliary voltage equalization circuit cooperates with the voltage loop inside the system contr...

Embodiment 2

[0066] Such as Figure 4 As shown, the difference between this embodiment and Embodiment 1 is that: when the positive and negative DC bus voltage values ​​are unbalanced, the two voltage values ​​are subtracted, and the voltage equalization correction value em is obtained through the PI regulator, and the em is superimposed To the setting of the feedback control of the second auxiliary power supply 2, the output voltage of the second auxiliary power supply 2 is controlled.

[0067] When the voltage value of the negative DC bus is high, the voltage equalization correction value em is positive, the output voltage of the second auxiliary power supply 2 rises, the energy consumed on the negative DC bus is higher than that of the positive DC bus, and the voltage of the negative DC bus is forced to decrease; otherwise , the energy consumed on the negative DC bus is less than that of the positive DC bus, forcing the voltage of the positive DC bus to decrease. The control of the DC b...

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Abstract

The invention relates to reactive power compensation equipment for power grids, in particular to a three-level static var generator with auxiliary voltage equalization and its voltage equalization method, to solve the problem of a sudden change in the large-capacity load of the existing three-level static var generator. Negative DC bus voltage value will be unbalanced for a short time, which will affect the compensation effect of static var generator, and even cause technical problems of bus voltage overvoltage fault. The present invention includes a three-level circuit, an auxiliary voltage equalizing circuit and a system controller, wherein the auxiliary voltage equalizing circuit includes a first auxiliary power supply, a second auxiliary power supply, a first output diode and a second output diode; the system controller includes an auxiliary voltage equalizing circuit The controller, the auxiliary voltage equalization controller can obtain the deviation correction value of the positive DC bus and the negative DC bus voltage, and superimpose it on the voltage control terminal of the auxiliary power supply. The increase of the auxiliary power supply voltage will increase the power consumed by the DC bus, forcing the DC bus to The voltage is reduced to achieve auxiliary voltage equalization.

Description

technical field [0001] The invention relates to power grid reactive power compensation equipment, in particular to a three-level static var generator with auxiliary voltage equalization and a voltage equalization method thereof. Background technique [0002] In power electronic equipment, Static Var Generator (SVG) is an advanced dynamic var compensation device with fast adjustment speed and wide operating range. The static var generator adopts multi-level technology, which can greatly reduce the harmonic content in the compensation current. The three-level static var generator is one of the mainstream technologies for high-frequency, modular low-voltage static var generators. [0003] In the existing three-level static var generator, its DC bus is composed of positive and negative DC voltages relative to the neutral line (N), and the two sets of bus voltage values ​​can be equalized through software control. However, when the large-capacity load changes suddenly, the posit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18H02M7/483H02M3/335
CPCH02J3/1842H02M7/483H02M3/33507Y02E40/10
Inventor 张均华
Owner XIAN ACTIONPOWER ELECTRIC
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