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.

Inactive 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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Problems solved by technology

Although this method can obtain a good control effect, the traditional PI double closed-loop control parameters are not easy to debug, slow dynamic response, and limited stable operation range.

Method used

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

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Embodiment

[0032] This embodiment is a passive sliding mode variable structure control method of MMC-STATCOM, MMC-STATCOM includes: a three-phase three-wire modular multilevel converter, the AC side of which is directly or through a three-phase transformer It is connected to the AC power grid, and its specific structure is as follows figure 1 , 2 , 3 shown.

[0033] The MMC-STATCOM converter includes 6 bridge arms, and each bridge arm is connected in series by a reactor and N half-bridge sub-modules in turn.

[0034] The nonlinear control method of MMC-STATCOM such as Figure 4 shown, including:

[0035] The converter adopts a voltage and current double closed-loop decoupling control strategy based on the dq rotating coordinate system. Reactive power adjustment is performed through the q-axis component, generating or absorbing reactive power, and thereby stabilizing the AC bus voltage at the access point; active power adjustment is performed through the d-axis component, and the acti...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02J3/38H02J3/50H02J3/48
CPCH02J3/1857H02J3/1864H02J3/38H02J3/48H02J3/50Y02E40/10
Inventor 黄阮明朱淼阮映琴郭明星陈阳庞爱莉张梦瑶赵鹏飞兰莉傅晨
Owner 国网上海市电力公司经济技术研究院
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