A Coordinated Control Method for Improving Grid Frequency Stability After DC Blocking

A frequency stability, DC blocking technology, applied in the power transmission AC network, reducing/preventing power oscillation, etc., can solve problems such as coordination control problems that are not considered, to improve economy and safety, improve frequency stability, Avoiding the effect of load shedding
CN108879733BActive Publication Date: 2022-06-03NANJING NARI GROUP CORP +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING NARI GROUP CORP
Publication Date
2022-06-03

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Abstract

The invention discloses a coordinated control method for improving the frequency stability of the power grid after DC blocking. The cooperative control master station receives the DC blocking information sent by the DC control execution station, and obtains the control amount and the effective control object set from the matching of the control strategy table; The control master station identifies the current effective control quantities of DC, energy storage, and load controllable objects, forms real-time control measures, and sends them to the DC control execution station, energy storage control execution station, and load control execution station to coordinate and complete emergency control. The invention provides a coordinated control method for improving the frequency stability of the power grid after DC blocking, which can be used to solve the priority order problem of various control objects after the DC blocking of the receiving power grid, and is beneficial to make full use of the available DC, energy storage, and load systems. control characteristics, improve the frequency stability of the system, avoid reducing load shedding, and improve the economy and safety of power system operation.
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Description

technical field

[0001] The invention relates to a coordinated control method for improving the frequency stability of a power grid after DC blocking, and belongs to the technical field of automatic control of power systems. Background technique

[0002] At present, with the large-scale construction of UHVDC projects, the relationship between AC and DC systems and between DC systems is getting closer and closer. During the transition period of UHV power grid construction, the characteristics of “strong direct and weak alternating current” are obvious, and the safe operation of the system faces great risks. In a multi-infeed HVDC transmission system, due to the short electrical distance between the DC inverter stations, the interaction between the AC and DC systems is complex, and the failure of the DC system or the receiving AC system may lead to simultaneous or successive commutation failures of multiple circuits. and continuous commutation failure, resulting in DC blocking...

Claims

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