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Subsynchronous resonance suppression method for doubly-fed wind turbine based on convertor cooperative damping control

A doubly-fed wind turbine, subsynchronous resonance technology, applied in circuit devices, AC network circuits, reducing/preventing power oscillations, etc., can solve problems such as low equipment utilization, control signal acquisition errors, etc.

Inactive Publication Date: 2018-10-09
HARBIN INST OF TECH
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Problems solved by technology

[0004] The present invention aims to solve the problems of low equipment utilization rate and errors in control signal acquisition in existing subsynchronous oscillation suppression methods, and now provides a subsynchronous resonance suppression method for doubly-fed wind turbines based on converter cooperative damping control

Method used

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  • Subsynchronous resonance suppression method for doubly-fed wind turbine based on convertor cooperative damping control
  • Subsynchronous resonance suppression method for doubly-fed wind turbine based on convertor cooperative damping control
  • Subsynchronous resonance suppression method for doubly-fed wind turbine based on convertor cooperative damping control

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specific Embodiment approach 1

[0025] Embodiment 1: The subsynchronous resonance suppression method for doubly-fed wind turbines based on converter cooperative damping control described in this embodiment includes the following steps:

[0026] Step 1: Collect the stator current signal i through the stator current sensor of the stator winding of the doubly-fed generator s_abc , the grid-side converter current i is collected by the grid-side converter current sensor g_abc .

[0027] Step 2: The stator current signal i s_abc and grid-side converter current i g_abc The stator current signal i in the synchronous rotating system is obtained through Clark transformation and Park transformation in turn s_dq and grid-side converter current i g_dq °

[0028] Step 3: Use a second-order high-pass filter to eliminate i s_dq and i g_dq Influence of the DC component, the d, q axis disturbance components of the stator current and the d, q axis disturbance components of the grid-side converter are extracted respectiv...

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Abstract

A subsynchronous resonance suppression method for a doubly-fed wind turbine based on convertor cooperative damping control relates to the technical field of grid-connected control of doubly-fed wind turbines. The invention is to solve the problem that the subsynchronous oscillation suppression method has low device utilization rate and control errors. The invention comprises: sequentially performing Clark transform and Park transform on the collected stator current signal and the grid side converter current, and using a high-pass filter to eliminate the influence of the direct current component, inputting the d and q-axis disturbance components of the stator current into the proportional amplifier to obtain a rotor voltage additional signal, inputting the d and q-axis disturbance components of the grid side converter is input into the proportional amplifier to obtain a grid side converter current reference additional signal, loading the rotor voltage additional signal into the output signal of the rotor side current controller, and loading the grid side converter current reference additional signal into the input signal of the grid side converter current controller, thereby achieving the suppression of the subsynchronous resonance of the doubly-fed wind turbine.

Description

technical field [0001] The invention belongs to the technical field of doubly-fed wind turbine grid-connected control. Background technique [0002] Series compensation reduces the equivalent reactance of the line by compensating the capacitance in series on the line, which can improve the transmission capacity of the line. However, in large-scale wind power grid-connected systems, there is a risk of inducing subsynchronous resonance (SSR), which has attracted widespread attention at home and abroad. [0003] Doubly-fed wind turbine is currently the most widely used type of wind turbine, but it is more prone to subsynchronous oscillation than other types of wind turbines in the case of series compensation. At present, the subsynchronous oscillation suppression methods of doubly-fed wind turbine series compensation lines can be mainly divided into two categories: one is to use the flexible AC transmission system (FACTS) device to suppress, and the other is to suppress throug...

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/24H02J2203/20
Inventor 张学广邱望明方冉陈文佳徐殿国
Owner HARBIN INST OF TECH
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