Frequency modulation characteristic control policy for doubly-fed wind turbine generator-energy storage system by simulating synchronous machine

Abstract

The invention discloses a frequency modulation characteristic control policy for a doubly-fed wind turbine generator-energy storage system by simulating a synchronous machine. The control policy is characterized by comprising the steps of establishing the doubly-fed wind turbine generator-energy storage system considering self wind power frequency modulation capacity; enabling the doubly-fed wind turbine generator-energy storage system to simulate capacity configuration of the frequency modulation characteristic of the synchronous machine, and enabling the doubly-fed wind turbine generator-energy storage system to perform frequency modulation control policy analysis and the like; establishing the doubly-fed wind turbine generator-energy storage system by analysis of the frequency modulation requirement of the system, combination of the self frequency modulation capacity of the doubly-fed wind turbine generator, and reasonable configuration of the energy storage capacity; reasonably allocating the power modulation capacity according to different frequency response time of the wind turbine generator and the energy storage system to endow the doubly-fed wind turbine generator-energy storage system with frequency response capability which is similar to that of a conventional synchronous generator so as to realize bidirectional frequency modulation; and by fully utilizing the complementary advantages of the wind turbine generator and the energy storage system under different air speeds in the aspects of frequency response speed, available frequency modulation energy and the like, lowering the energy storage configuration cost. The control policy has the advantages of scientific and reasonable property, high applicability, excellent effect and the like.

Description

technical field [0001] The invention relates to the technical field of new energy power generation, and is a doubly-fed wind turbine-energy storage system analog synchronous machine frequency modulation characteristic control strategy. Background technique [0002] Low-carbon power promotes the large-scale development of wind power, and the proportion of wind power has increased significantly; the output power of wind turbines has the characteristics of randomness, intermittency, and volatility. The problem of safe operation brings new challenges; as we all know, the speed of synchronous generators is directly coupled with the frequency of the power system, which can quickly respond to system frequency changes and has the ability to damp system frequency fluctuations; while wind turbines including doubly-fed induction wind turbines Connected to the power grid through a four-quadrant converter, when the wind turbine is running in Maximum Power Point Tracking (MPPT) mode, the ...

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Problems solved by technology

[0002] Low-carbon power promotes the large-scale development of wind power, and the proportion of wind power has increased significantly; the output power of wind turbines has the characteristics of randomness, intermittency, and volatility. The problem of safe operation brings new challenges; as we all know, the speed of synchronous generators is directly coupled with the frequency of the power system, which can quickly respond to system frequency changes and has the ability to damp system frequency fluctuations; while wind turbines including doubly-fed induction wind turbines Connected to the power grid through a four-quadrant converter, when the wind turbine is running in Maximum Power Point Tracking (MPPT) mode, the operating state of the wind turbine is "isolated" from the system, unable to respond to system frequency changes, and has no contribution to system frequency regulation , which deteriorates the security of system operation;

[0003] Scholars at home and abroad conduct research from the following two aspects: 1) Improve the operation control strategy of wind turbines so that they have the ability to respond to system frequency changes; 2) The wind farm participates in the system frequency control with the energy storage system; During the restoration process, the system frequency may drop twice. At the same time, the power system does not always require the wind farm to provide frequency modulation energy, resulting in a low utilization rate of the wind farm’s standby power and a reduction in the economic benefits of the wind farm. The latter ignores the wind turbine rotor speed control capability. , resulting in frequent movements of the pitch angle, accelerated mechanical wear, and indirectly increased the cost of frequency modulation

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