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Subsynchronous resonance control method and device for wind power and flexible direct current system

A technology of subsynchronous resonance and control method, which is applied in circuit devices, wind power generation, electrical components, etc., can solve the problems of high economic input requirements, the impact of transient characteristics of wind power and flexible direct systems, and the decline of economic benefits.

Active Publication Date: 2021-04-09
ELECTRIC POWER RES INST STATE GRID JIBEI ELECTRIC POWER COMPANY +1
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Problems solved by technology

However, from a long-term perspective, this method has a greater impact on the transient characteristics of wind power and flexible DC systems (transient characteristics of power frequency signals), such as transient characteristics during low-voltage ride-through and fault control; 2) blocking filtering device
The blocking filter realizes the control of subsynchronous oscillation by adding an LC filter to the actual wind power and flexible straight system, but this method requires high initial economic investment, and with the increase of system capacity, the required filter The capacity is also larger, and the economic benefits are also reduced

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  • Subsynchronous resonance control method and device for wind power and flexible direct current system
  • Subsynchronous resonance control method and device for wind power and flexible direct current system
  • Subsynchronous resonance control method and device for wind power and flexible direct current system

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[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0028] In the description of this specification, the words "comprising", "comprising", "having", "containing" and so on are all open terms, meaning including but not limited to. A description referring to the terms "one embodiment," "a particular embodiment," "some embodiments," "for example," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one of the present application. Examples or examples. In this specification, schematic representations of the above terms do not ne...

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Abstract

The invention provides a subsynchronous resonance control method and device for a wind power and flexible direct current system. The method comprises the following steps: determining a sensitivity parameter value of each control loop in the wind power and flexible direct current system according to subsynchronous resonance control parameters of each control loop in the wind power and flexible direct current system; based on the sensitivity parameter value of each control loop, determining the control loop of which the influence on the subsynchronous resonance characteristic of the wind power and flexible direct current system exceeds a set range; adding a frequency change controller into the control loop of which the influence on the subsynchronous resonance characteristic of the wind power and flexible direct current system exceeds a set range; and inputting an output result of the control loop added with the frequency change controller into a wind power and flexible direct current system. The method and the device can achieve the control of the subsynchronous frequency oscillation of the wind power and the flexible direct current system, are high in accuracy, do not affect the transient characteristics of a power frequency signal, and are low in cost.

Description

technical field [0001] The invention relates to the technical field of electric power systems, in particular to a subsynchronous resonance control method and device for wind power and flexible straight systems. Background technique [0002] In recent years, the demand for large-capacity and long-distance power transmission systems in new energy systems has gradually increased. With the large-scale application of new energy systems, the subsynchronous oscillation problems related to wind power and flexible DC converters have gradually become prominent, causing a lot of problems for Research on subsynchronous resonance control. [0003] At present, the commonly used subsynchronous resonant controllers of wind power and flexible straight systems mainly adopt two methods: 1) Additional damping controllers. The additional damping controller analyzes the impedance characteristics of wind power and DC systems, and from the perspective of impedance reshaping, adds a damping control...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/36H02J3/38
CPCH02J3/002H02J3/36H02J3/381H02J2203/10H02J2300/28Y02E60/60
Inventor 胡应宏龙凯华彭珑赵媛张静岚蔡巍刘羿辰
Owner ELECTRIC POWER RES INST STATE GRID JIBEI ELECTRIC POWER COMPANY
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