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Parameter design method for high-voltage high-capacity VSC (voltage source converter)

A voltage source converter, parameter design technology, applied in AC network to reduce harmonics/ripple, harmonic reduction devices, etc., can solve the problem of difficult to accurately realize the control target of the converter, and avoid the problem of power loss , The effect of meeting the requirements of grid-connected power quality

Active Publication Date: 2015-06-24
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fundamental wave content and harmonic content of the valve side current and the grid side current of the voltage source converter are not the same. Using the grid side current to control the valve side current will easily make the control target of the converter difficult to achieve accurately.

Method used

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  • Parameter design method for high-voltage high-capacity VSC (voltage source converter)
  • Parameter design method for high-voltage high-capacity VSC (voltage source converter)
  • Parameter design method for high-voltage high-capacity VSC (voltage source converter)

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Embodiment Construction

[0043] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0044] The main circuit topology of three-phase voltage source converter (VSC) using LCL filter is as follows: figure 1 As shown, the LCL filter includes a grid-side reactor, a valve-side reactor, and a filter capacitor connected in parallel between the valve-side reactor and the grid-side reactor.

[0045] The parameters involved in the LCL filter for high-voltage and large-capacity converters include the reactance value of the valve-side reactor, the reactance value of the grid-side reactor, the short-circuit resonant frequency, the open-circuit resonant frequency and the capacitance value of the filter capacitor. Its design method is:

[0046] (1) Calculate the reactance value parameters of the valve side reactor. The inductance of the valve side reactor is obtained by using the power operating range of the voltage ...

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Abstract

The invention provides a parameter design method for a high-voltage high-capacity VSC (voltage source converter). The VSC is connected with an electric grid through an LCL (lower control limit) filter, the LCL filter comprises an electric grid side electric reactor, a valve side reactor and a filter capacitor, and the filter capacitor is connected in parallel between the valve side reactor and the electric grid side electric reactor. The problems for filtering out harmonic waves filled into the electric grid by the VSC and inhibiting the converter main loop resonance led in by the LCL filter are solved through setting the parameters of the LCL filter and a controller of the VSC. Compared with the simple experience algorithm and the complicated calculating method of the existing LCL filter, the method has the advantages that the parameter of the filter is designed according to the operation characteristics of the VSC and the frequency-domain characteristics of the LCL filter, simplicity is realized, the implementation is easy, the engineering construction can be realized, the theoretical basis is full, the harmonic pollution to the electric grid is low, and the grid-connected electric energy quality requirement of the national standard on the VSC can be met.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a parameter design method for a high-voltage and large-capacity voltage source converter. Background technique [0002] With the development of power electronic control technology and full-control devices, voltage source converters (Voltage source converters, VSCs) using flexible control methods have been widely used in power systems such as flexible direct current transmission, new energy grid-connected and other fields due to their many advantages. wider application. In the field of electric power engineering and scientific research, the rated operating power and rated voltage of voltage source converters have been continuously improved, and a mature market for high-voltage and large-capacity converters has been formed. [0003] The high-voltage and large-capacity voltage source converter that introduces PWM modulation technology will generate characteristic harmonic c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 武迪赵晓冬俞拙飞陈永华温传新
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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