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Control method of photovoltaic power station converter for transient stability of system

A technology for transient stability and photovoltaic power plants, applied in the field of power systems, can solve problems such as the inability to judge changes in system stability as a whole, and achieve effects that are conducive to safety and stability

Pending Publication Date: 2021-03-02
TIANJIN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

The conclusions of the existing literature on the influence of large-scale photovoltaic power plants on the transient stability of the power system are not consistent. , to judge the transient stability. When the power injected into the system motor and load node changes, it needs to re-simulate and calculate. The conclusion obtained is related to the operating state of the system. Transient characteristics are related to the inverter control strategy of photovoltaic power plants

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  • Control method of photovoltaic power station converter for transient stability of system
  • Control method of photovoltaic power station converter for transient stability of system
  • Control method of photovoltaic power station converter for transient stability of system

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[0041] Certain terms are used, for example, in the description and claims to refer to particular components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. As mentioned throughout the specification and claims, "comprising" is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0042] In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

[0043] In the invention, unless otherwise clearly specified and l...

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Abstract

The invention belongs to the technical field of power systems, and particularly relates to a control method of a photovoltaic power station converter for transient stability of a system. The method comprises the following steps of: 1, solving a dynamic safety domain of a photovoltaic power station by adopting a fitting method; 2, judging whether the boundary of the dynamic security domain can be fitted through a hyperplane or not; 3, selecting a plurality of operation points of the boundary of the dynamic security domain, performing simulation through a time domain, and checking the accuracy of the boundary; and 4, comparing the dynamic security domains of the photovoltaic power station under different control strategies, and obtaining an optimal control strategy according to the range size of the dynamic security domains. According to the invention, the control mode of the photovoltaic power station can be guided, and the safety and stability of the power system are facilitated.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a control method for a photovoltaic power station converter used for system transient stability. Background technique [0002] Fossil energy is increasingly depleted, and renewable energy power generation is the general trend. Photovoltaic, one of the representatives of renewable energy power generation, has continuously reduced its cost and its technology has become increasingly mature. my country's solar energy resources are mainly concentrated in the northwestern region, which is far away from the load center and requires high-voltage long-distance transmission. Therefore, the development trend of my country's photovoltaic industry is the large-scale and large-scale photovoltaic power plants. At present, many large-scale photovoltaic power plants with a capacity of several hundred megawatts are under construction or have been completed. For example, the firs...

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Application Information

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IPC IPC(8): H02J3/38H02J3/46
CPCH02J3/381H02J3/46H02J2203/20H02J2300/24Y02E10/56
Inventor 刘怀东方伟
Owner TIANJIN UNIV