Method for controlling passive sliding mode variable structure of MMC-STATCOM

A sliding-mode variable structure and control method technology, applied in flexible AC transmission systems, reactive power adjustment/elimination/compensation, AC network circuits, etc., can solve the problem that PI double closed-loop control parameters are difficult to debug, slow dynamic response, and stable operation. It can achieve strong robustness and anti-interference ability, fast dynamic response speed, and improve control quality.
CN111884232AInactive Publication Date: 2020-11-03国网上海市电力公司经济技术研究院 +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
国网上海市电力公司经济技术研究院
Publication Date
2020-11-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a passive sliding mode variable structure control method of an MMC STATCOM, and the method is used for controlling an STATCOM device. The STATCOM device is a modular multilevel converter connected with an alternating current power grid, and the method comprises the following steps: adopting a voltage and current double-closed-loop decoupling control strategy based on a dqrotating coordinate system to carry out reactive power regulation through q-axis components to generate or absorb reactive power, so as to stabilize the AC bus voltage of the access point; carrying out active adjustment through a d-axis component, absorbing active power from a power grid AC bus to compensate active power loss of the converter, so the stability of the voltage of the direct-currentside of the converter is maintained. Compared with the prior art, the method has the advantages that the control system has high robustness and anti-interference capability on external disturbance andinternal parameter change, so that the control quality is improved. Compared with a traditional double-closed-loop PI, the method has the advantages that parameters are easy to adjust, the dynamic response speed is high, and robustness is high.
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Description

technical field

[0001] The invention relates to a reactive power control method of a grid, in particular to an MMC-STATCOM passive sliding mode variable structure control method. Background technique

[0002] FACTS devices play an important role in the construction of smart grid and energy Internet. STATCOM device is a static var generator device based on fully-controlled power electronic devices. It is one of the devices with the strongest reactive power control capability in the FACTS family and can effectively adjust the grid voltage level.

[0003] The basic structure of STATCOM is a three-phase inverter whose AC side voltage can be flexibly adjusted. At present, research on STATCOM devices at home and abroad mainly focuses on multi-level and H-bridge cascaded circuits. In order to meet the application requirements in the field of high-voltage and large-capacity power transmission, it is an inevitable trend for STATCOM devices to develop into modular multilevel (MMC) c...

Claims

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