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Subsynchronous Oscillation Suppression Method for Doubly-fed Wind Turbines Based on Virtual Impedance Control

A virtual impedance control, subsynchronous oscillation technology, applied in the direction of reducing/preventing power oscillation, wind power generation, AC network circuit, etc., can solve the problems of complex controller structure, lack of physical concept, cumbersome parameter configuration, etc. Oscillation, the effect of low control cost

Active Publication Date: 2020-02-18
SOUTHEAST UNIV
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Problems solved by technology

However, the controller structure is relatively complex, and its parameter configuration is too cumbersome, which needs to be obtained through repeated time-domain simulation experiments, and lacks a clear physical concept

Method used

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  • Subsynchronous Oscillation Suppression Method for Doubly-fed Wind Turbines Based on Virtual Impedance Control
  • Subsynchronous Oscillation Suppression Method for Doubly-fed Wind Turbines Based on Virtual Impedance Control
  • Subsynchronous Oscillation Suppression Method for Doubly-fed Wind Turbines Based on Virtual Impedance Control

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Embodiment Construction

[0033] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] Such as figure 1 Shown is the equivalent circuit diagram of the test system of the present invention, which is a wind power delivery system including a double-fed wind farm and series capacitor compensation. The double-fed wind farm is composed of several identical 1.5MW double-fed fans, and each double-fed fan passes through The 0.69 / 35kV on-site transformer T1 is connected to the same busbar for grid-connected power generation, and the entire doubly-fed wind farm is simulated with a single-machine equivalent model. The entire double-fed wind farm is then connected to the 220kV line through the 35 / 220kV transformer T2, and finally connected to the 500kV line through the 220 / 500kV step-up transformer T3 for long-distance power transmission, and a series capacitor X is installed in the 500kV line C To compensate, the se...

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Abstract

The invention discloses a double-feed blower fan subsynchronous oscillation inhibition method based on virtual impedance control, and the method comprises the steps: enabling a dq-axis component of a rotor current of a double-feed blower fan to serve as an input signal, and filtering a low-frequency component and a fundamental frequency component through a band-pass filter, and then obtaining a subsynchronous current component. The current component brings virtual impedance to a rotor loop through a proportional amplifier and a differentiation link, thereby achieving the effects of increasing the subsynchronous oscillation damping and inhibiting the subsynchronous oscillation. According to the invention, the method starts from the structure of a rotor controller, achieves the research of the relation between the rotor current and the output voltage of the rotor controller, and obtains the equivalent resistance of a rotor side controller, i.e., the virtual resistance value. Afterwards, a double-feed blower fan rotor current transfer function model is used for solving and obtaining a virtual inductance value needed by the virtual impedance control. The method is advantageous in that the method is simple in parameter configuration, is clear in physical concepts, improves a virtual resistance control strategy, is better in adaptability, is low in control cost, and can effectively inhibit the subsynchronous oscillation to a certain degree.

Description

technical field [0001] The invention belongs to the field of power system stability and control, in particular to a subsynchronous oscillation suppression method for double-fed wind turbines based on virtual impedance control. Background technique [0002] Large cluster wind power access is the development direction of China's power grid. Due to the regional characteristics of wind energy, the overall distribution of wind energy resources and load centers in my country is reversed. Large-scale, high-voltage, and long-distance transmission of wind power is essential. Series capacitor compensation is one of the cost-effective measures to solve the problem of long-distance power transmission, and it is also the main measure for wind power grid-connected long-distance transmission. The transmission of thermal power through series compensation is easy to cause the problem of subsynchronous resonance, which is well known to people; the problem of subsynchronous oscillation also e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/24H02J3/386Y02E10/76
Inventor 吴熙宁威
Owner SOUTHEAST UNIV
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