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Method for solving three-phase voltage imbalance by using SVG (Static Var Generator)

A three-phase voltage and balanced technology, applied in the direction of reducing the asymmetry of the multi-phase network, eliminating/reducing the asymmetry of the multi-phase network, etc., can solve the problems of the influence of the electrical equipment, large installation capacity, and load failure, etc., to achieve The effect of high control precision, improved tracking precision and fast response speed

Inactive Publication Date: 2011-11-23
RONGXIN POWER ELECTRONICS
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Due to the existence of single-phase loads (such as electrified railways) and three-phase asymmetrical loads (such as electric arc furnace loads) in the power grid, it will have a negative impact on the operation and efficiency of the power grid, and at the same time it will also connect to other electricity in the public power grid. The equipment brings some adverse effects or even hazards
Three-phase unbalance will generate negative sequence current, which will cause the negative sequence protection action of the power grid and affect the safety of power supply.
[0004] 1) It has large installation capacity, large floor space, large self-loss, and difficult ventilation and heat dissipation
[0005] 2) It generates harmonics by itself, and needs to be equipped with a suitable filter to filter
[0006] 3) The main control device of SVC is a thyristor, and its slow response speed cannot achieve the ideal effect on the rapidly changing load
[0008] 5) The filter is filtered by changing to harmonic impedance, which will generate series and parallel resonance in the system, which will endanger the safety of power supply

Method used

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  • Method for solving three-phase voltage imbalance by using SVG (Static Var Generator)
  • Method for solving three-phase voltage imbalance by using SVG (Static Var Generator)
  • Method for solving three-phase voltage imbalance by using SVG (Static Var Generator)

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Embodiment Construction

[0047] The specific implementation manner of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0048] See figure 1 , figure 2 , SVG method for solving three-phase voltage imbalance, including the following steps:

[0049] 1) Sampling; detect the grid voltage signal, and input the variation of the grid voltage to the controller;

[0050] 2) Filtering; filter out the high and low frequencies through a low-pass and high-pass filter, and then perform band-pass filtering through the band-pass filter in the band-pass filter to obtain a grid voltage difference signal;

[0051] 3) Phase correction; the above signals are then corrected by their respective phase shifting modules,

[0052] 4) proportional amplification; the signal after correcting the phase is then amplified by the proportional amplification module;

[0053] 5) Operational processing: perform operational processing on the phase-corrected and proportionally ampli...

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Abstract

The invention relates to a method for solving three-phase voltage imbalance by using an SVG (Static Var Generator). The method comprises the steps of sampling, filtering, phase correcting, proportional amplifying and operational processing. A comprehensive control quantity obtained by operating and processing is converted into an IGBT (Insulated Gate Bipolar Translator) triggering time through a function; a controller is used for controlling the IGBT triggering time by taking a PT (Potential Transformer) signal as a synchronous signal; therefore, an all-controlled converter in the SVG generates a voltage signal which is same as the three-phase difference value of a power grid and opposite in direction to offset unbalance voltage in the power grid; and a purpose of balancing the three-phase voltage is achieved. According to the method, by adopting the all-controlled converter, the three-phase voltage imbalance problem can be solved effectively; the response speed is rapid; the tracking precision is high; and the stability and the reliability of the power grid can be greatly improved.

Description

technical field [0001] The invention relates to a method for solving unbalanced three-phase voltages by SVG, in particular to a method for solving unbalanced three-phase voltages by using an SVG of a fully-controlled converter device. Background technique [0002] Due to the existence of single-phase loads (such as electrified railways) and three-phase asymmetrical loads (such as electric arc furnace loads) in the power grid, it will have a negative impact on the operation and efficiency of the power grid, and at the same time it will also connect to other electricity in the public power grid. The equipment brings some adverse effects or even hazards. Three-phase unbalance will generate negative sequence current, which will cause the negative sequence protection action of the power grid and affect the safety of power supply. Unbalanced current injected into the system will cause unbalanced three-phase voltage, loads working on the power grid with three-phase unbalanced volt...

Claims

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Application Information

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IPC IPC(8): H02J3/26
CPCY02E40/50
Inventor 王晓敏李旷郭自勇孙贤大
Owner RONGXIN POWER ELECTRONICS
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