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Static synchronous compensator device of three-phase three-bridge-arm power distribution network and control method

A static synchronous compensation and distribution network technology, applied in the direction of circuit devices, reactive power adjustment/elimination/compensation, electrical components, etc., can solve the problems of inability to guarantee compensation capability, large algorithm delay, and incompatibility with various reactive power compensation way and other issues

Active Publication Date: 2017-06-13
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problems to be solved in the present invention are: the static synchronous compensator device of the distribution network disclosed in the present invention cannot be connected to the grid to start directly or cause a huge inrush current, cannot be compatible with various reactive power compensation methods, and cannot be guaranteed according to the voltage environment of the distribution network. Compensation ability, incapable of stable and safe step-down and step-down, unable to solve the problems of large amount of calculation and algorithm delay caused by the traditional low-pass filtering method, providing a static synchronous compensator device and control method for a three-phase three-arm distribution network

Method used

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  • Static synchronous compensator device of three-phase three-bridge-arm power distribution network and control method
  • Static synchronous compensator device of three-phase three-bridge-arm power distribution network and control method
  • Static synchronous compensator device of three-phase three-bridge-arm power distribution network and control method

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Experimental program
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Effect test

Embodiment 1

[0071] In this embodiment, the device startup simulation experiment is carried out using the condition of the presence or absence of the precharge circuit 2 . image 3 and Figure 4 medium, U sa represents the A-phase voltage of the distribution network 9, i a Indicates the A-phase current on the AC side of the power module 4. use figure 1 in the structural circuit.

[0072] The pre-charging circuit 2 can be divided into four steps during the start-up process of the device being connected to the network:

[0073] Step 1: Precharge the DC side capacitor 11 of the power module 4; the device 1 adopts a precharge circuit 2 composed of an uncontrollable rectifier bridge 2-1, a KM1 contactor 2-2, and a current limiting resistor 2-3. The control realizes the charging of the DC side capacitor 11 of the power module 4 . The specific operation is: close the KM1 contactor 2-2 and KM2 contactor 2-4 in the precharge circuit 2, so that the precharge circuit 2 can charge the DC side ca...

Embodiment 2

[0082] In this embodiment, the real-time detection of reactive current and the automatic compensation operation of the device 1 of the present invention are described; the process of real-time detection of reactive current of the device of the present invention is as follows: Figure 5 shown.

[0083] The first stage: Calculate the reactive current in the load current; collect the load current i through the current transformer la,lb , using the coordinate equivalent transformation to calculate the reactive current, but the reactive current at this time, in addition to the DC component, also contains the AC component.

[0084] The second stage: filter the reactive current to obtain the reactive current command If it is not filtered, it may cause over-compensation, and even inject a large amount of harmonics into the power grid, and the compensation effect is poor. Therefore, it is considered to be compensated after filtering.

[0085] The third stage: the device runs with lo...

Embodiment 3

[0089] In this embodiment, for the soft-start gate valve voltage U of the device of the present invention dc_start and DC link voltage target command of power module 4 It can be changed to ensure the compensation capability of the device 1. The specific implementation is as follows:

[0090] The soft-start gate valve voltage of the device 1 and the DC side voltage target command of the power module 4 are both obtained by collecting the voltage signal of the distribution network 9 and calculating by the data processing unit 3-2. changed characteristics;

[0091] The formula for calculating the soft-start gate valve voltage is:

[0092] U dc_start =K 1 ×V s(peak) (1)

[0093] In the formula, U dc_start Represents the soft-start gate valve voltage of device 1, that is, the DC side voltage value of power module 4 when device 1 starts; V s(peak) Represents the 9-phase voltage peak value of the distribution network; K 1 represents a user-defined coefficient, but K 1 Gene...

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Abstract

The invention discloses a static synchronous compensator device of a three-phase three-bridge-arm power distribution network and a control method. The static synchronous compensator device is specially composed of a pre-charging circuit, a control module, a power module, a protection module and a human-computer interaction interface. The static synchronous compensator device has the advantages that the problem of impact current produced by high-voltage network-hanging start and voltage rise and fall of the device is solved by utilizing forward characteristics of the pre-charging circuit and an inverse proportional function; the device has a friendly human-computer interaction interface, the selectable reactive compensation mode and operation information display of the device can be achieved, and the device is more humanized and intelligentized; 3, the idle handling capacity can be ensured according to a power distribution network voltage environment; 4, a traditional lowpass filtering method is replaced by adopting a movable pointer average filter method and a novel approach smoothing crest method, the operating efficiency of an algorithm routine is improved, and the problem of reactive current detection delaying is eliminated. The cost of the device is reduced, the technical contents of the reactive compensation device are enriched, and the device has a certain reference value on engineering application.

Description

technical field [0001] The invention relates to the technical field of reactive power compensation devices, in particular to a three-phase three-bridge arm distribution network static synchronous compensator device and a control method. Background technique [0002] At present, although the finished static synchronous compensator device already exists, it is expensive and the engineering technology has not been disclosed. The static synchronous compensator has been favored by scholars at home and abroad due to its advantages of fast reactive power compensation response and wide continuous adjustment range. [0003] The currently disclosed prototype device of static synchronous compensator for distribution network still has many shortcomings, such as: the device cannot be directly connected to the grid to start or generate huge inrush current at the moment of startup, cannot complete real-time detection of reactive current, single compensation capacity and fixed The given in...

Claims

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Application Information

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IPC IPC(8): H02J3/18
CPCH02J3/1842Y02E40/10
Inventor 杨达亮徐胜光吴宁卢子广吴玮钦王慧
Owner GUANGXI UNIV
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