Control method and controller of MMC-HVDC (Modular Multilevel Converter- High Voltage Direct Current) connected with weak receiving end alternating current system
A technology of MMC-HVDC, AC system, applied in the field of control strategy of power electronic power system, can solve the problems of small disturbance and instability of the system, deterioration of dynamic characteristics, etc.
Pending Publication Date: 2018-11-27
STATE GRID CORP OF CHINA +1
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However, existing studies have shown that when the VSC-HVDC system based on Vector-Current-Control (VCC) is connected to a weak AC grid, the dynamic characteristics of the Phase-Locked Loop (PLL) will deteriorate, which can easily lead to The system is unstable due to small disturbances
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[0071] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0072] A control method of the MMC-HVDC connected to the weak receiver AC system, such as figure 1 As shown, the method includes:
[0073] Determine the additional damping component of the AC voltage according to the angular frequency signal output by the phase-locked loop;
[0074] Using the phase signal output by the phase-locked loop and the additional damping component of the AC voltage to adjust the output voltage signal of the current vector controller;
[0075] The MMC converter station is controlled by using the output voltage signal of the current vector controller.
[0076] Specifically, the determining the additional damping component of the AC voltage according to the angular frequency signal output by the phase-locked loop includes:
[0077] Determine the additional damping component U of the AC voltage by the fo...
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The invention discloses a control method and controller of MMC-HVDC (Modular Multilevel Converter- High Voltage Direct Current) connected with a weak receiving end alternating current system. The control method comprises the steps that according to an angular frequency signal output by a phase-locked loop, an alternating current voltage additional damping component is determined, the alternating current voltage additional damping component is used for adjusting an output voltage signal of a current vector controller, and then through the output voltage signal of the adjusted current vector controller, a trigger pulse signal is generated to control turn-on and shut-down of a switching tube in an MMC convertor station. By means of the control method and the controller, the MMC-HVDC system unstable phenomenon caused by reduction of alternating current system strength can be inhibited, and the stability of an alternating system can be effectively improved; moreover, both the control methodand the controller are simple and have good practicability.
Description
technical field [0001] The invention relates to a control strategy of a power electronic power system, in particular to a control method and a controller of an MMC-HVDC connected to a weak receiving end AC system. Background technique [0002] Due to the advantages of good waveform quality, low loss and high modularity, Modular Multilevel Converter (MMC) has become a new technology for Voltage Source Converter based High Voltage Direct Current Transmission (VDC) at present. , VSC-HVDC) engineering applications of the main topology. [0003] Since the VSC type converter adopts full-control devices, it does not need the commutation voltage provided by the grid, and can realize power supply to weak AC systems or passive networks. However, existing studies have shown that when the VSC-HVDC system based on Vector-Current-Control (VCC) is connected to a weak AC grid, the dynamic characteristics of the Phase-Locked Loop (PLL) will deteriorate, which can easily lead to The system ...
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IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 郭贤珊郭春义谭骞杜晓磊殷子寒赵成勇
Owner STATE GRID CORP OF CHINA