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Control method capable of improving stability during power exchange of VSC and weak AC network

A technology of AC power grid and control method, which is applied in the direction of AC network circuits, wind power generation, electrical components, etc., and can solve the problem that the transmission power cannot reach the steady-state limit, etc.

Active Publication Date: 2018-04-27
CHINA ELECTRIC POWER RES INST +2
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0020] In order to solve the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a control method for improving the stability of the exchange power between the voltage source converter and the weak AC grid, and to solve the problem of the classic double closed-loop control of the voltage source converter connected to the weak AC. When the transmission power cannot reach the steady-state limit in the grid, when the outer loop of the classic double closed-loop control is replaced by a complex nonlinear decoupling control, the power exchanged between the voltage source converter and the weak AC grid can reach the above-mentioned steady-state limit, and Simple control structure and simplified parameter design

Method used

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  • Control method capable of improving stability during power exchange of VSC and weak AC network
  • Control method capable of improving stability during power exchange of VSC and weak AC network
  • Control method capable of improving stability during power exchange of VSC and weak AC network

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Embodiment 1

[0104] Will figure 2 The main circuit topology and control system block diagram of the shown voltage source converter connected to the weak AC grid. Figure 5 The control method of the present invention shown is the best embodiment for specific application.

[0105] The method proposed by the present invention is applicable to voltage source converters that can be equivalent to controllable voltage sources on the AC side, including but not limited to common two-level VSC converters, three-level VSC converters, modular Multi-level (MMC) type VSC converter, etc.

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Abstract

The invention relates to a control method capable of improving the stability during power exchange of a VSC (voltage source converter) and a weak AC network. The control method comprises a nonlinear control law of outer loop control in double closed-loop control, an integral control law for eliminating a static error increase in the nonlinear control law, and outer loop control of the double closed-loop control formed through the nonlinear control law and the integral control law. According to the control method provided by the invention, the stability of a whole system formed by the voltage source converter and the weak AC network when the power is transmitted to the weak AC network by using the voltage source converter or the weak AC network outputs the power outwards by using the voltage source converter is improved, the possibility of a potential instability failure is reduced and the utilization efficiency of the voltage source converter is improved, thereby reducing the cost.

Description

technical field [0001] The invention relates to a control method for a connection system between a weak AC grid and a voltage source converter, in particular to a control method for improving the stability of exchange power between a VSC and a weak AC grid. Background technique [0002] Comparison between Voltage Source Converter based High Voltage Direct Current Transmission (VSC-HVDC) and conventional Line Commuted Converter based High Voltage Direct Current Transmission (LCC-HVDC) It has the advantages of flexible control, no commutation failure, and can supply power to weak AC grids and passive networks. It is especially suitable for the application scenarios of new energy grid-connected such as wind power generation, so it has been widely used. Voltage Source Converter (Voltage Source Converter, VSC) mainly has three typical topologies: two-level, three-level, and Modular Multilevel Converter (MMC). [0003] Although the voltage source converter has no commutation fail...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/382H02J3/386Y02E10/76
Inventor 吴广禄彭红英张星徐得超陈绪江穆清洪潮陈雁张东辉孙丽香刘敏王峰王艺璇徐树文王祥旭
Owner CHINA ELECTRIC POWER RES INST
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