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VSC (Voltage Source Converter)-HVDC (High Voltage Direct Current Transmission) system class synchronization machine controller design method

A technology of VSC-HVDC and controller, which is applied in the direction of AC network circuit, circuit device, reducing/preventing power oscillation, etc. It can solve the problems that the improvement effect needs to be improved, and the inner loop current is difficult to completely decouple, etc.

Active Publication Date: 2017-01-11
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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Problems solved by technology

[0003] At present, the existing controllers have the following problems: 1) It is difficult to completely decouple the inner loop current; 2) When the AC system encounters a large disturbance and may cause transient instability of the system, the existing VSC-HVDC controller has no The improvement effect of transient stability still needs to be improved

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  • VSC (Voltage Source Converter)-HVDC (High Voltage Direct Current Transmission) system class synchronization machine controller design method
  • VSC (Voltage Source Converter)-HVDC (High Voltage Direct Current Transmission) system class synchronization machine controller design method
  • VSC (Voltage Source Converter)-HVDC (High Voltage Direct Current Transmission) system class synchronization machine controller design method

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Embodiment Construction

[0027] The embodiments will be described in detail below in conjunction with the accompanying drawings.

[0028] figure 1 It is a detailed three-phase circuit topology diagram of a double-ended VSC-HVDC power transmission system. Assume figure 1 The left converter station in the center is the sending end station, working in the rectification mode; the right converter station is the receiving end station, working in the inverter mode. For the convenience of analysis, the connecting transformer and AC filter are omitted in the converter stations on both sides, and the leakage reactance and loss of the connecting transformer are uniformly equivalent to the phase reactor shown in the figure. Assuming that the parameters of the three-phase main circuit are exactly the same, the equivalent resistance and reactance are R s and L S , DC resistance and inductance respectively with R d and L d express. According to Kirchhoff's circuit law, the differential equation of the AC syst...

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Abstract

The invention belongs to the technical field of stability and control of power systems and particularly relates to a VSC (Voltage Source Converter)-HVDC (High Voltage Direct Current Transmission) system class synchronization machine controller design method in consideration of transient stability. The method comprises steps: a dual-unit equivalent model for the VSC-HVDC system is built, wherein the dual-unit equivalent model comprises an inverter end and a rectifier end; and a class synchronization machine controller is designed. The idea of a synchronous inverter is applied to HVDC containing the VSC, and the dual-unit equivalent model for the VSC-HVDC system is built; on the basis of the dual-unit equivalent model, the class synchronization machine controller with droop characteristics is designed, and the traditional outer-loop voltage inner-loop current controller is replaced to improve the transient stability of the system; and the class synchronization machine controller with the droop characteristics can be well applied to the VSC-HVDC system, adding of the class synchronization machine controller can effectively increase the system damping, the oscillation is suppressed, and the transient stability of an AC / DC system after disturbance can be improved.

Description

technical field [0001] The invention belongs to the technical field of power system stability and control, and in particular relates to a design method of a VSC-HVDC system-like synchronous machine controller considering transient stability. Background technique [0002] With the development of power electronic devices and control technology, DC transmission technology has been widely used. High-voltage direct current transmission technology based on voltage source converter and a new generation of high-voltage direct current transmission technology based on fully-controlled insulated gate bipolar transistors and pulse width modulation control technology have the ability to supply power to weak AC grids and even passive networks. There are many advantages such as no need for communication between the converter stations, active power and reactive power of the converter station can be independently and quickly controlled, and it is easy to build a multi-terminal DC transmissio...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/36
CPCH02J3/24H02J3/36H02J2203/20Y02E60/60
Inventor 陈艳波颛孙旭朱岸明陶帅马进
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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