A control method for improving the stability of doubly-fed wind turbines under weak grid conditions
The technology of a doubly-fed wind turbine and its control method is applied in the direction of wind power generation, single-grid parallel feed arrangement, etc., and can solve problems such as oscillation and instability of the doubly-fed wind turbine, and achieve simple and convenient use, cost saving, and improved The effect of stability
Active Publication Date: 2022-06-07
HARBIN INST OF TECH
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[0004] The present invention aims to solve the problem that doubly-fed wind turbines are prone to oscillation and instability under weak grid conditions, and now provides a control method for improving the stability of doubly-fed wind turbines under weak grid conditions
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specific Embodiment approach 1
[0049] Specific embodiment one: reference Figures 1 to 5 Specifically illustrate the present embodiment, a control method described in the present embodiment to improve the stability of doubly-fed wind turbines under weak grid conditions, comprising the following steps:
[0050] Step 1: Collect the parameters of the doubly-fed generator set as follows:
[0051] The stator current sensor of the doubly-fed generator stator winding is used to acquire the stator current signal i s_abc ，
[0052] The stator voltage sensor of the doubly-fed generator stator winding is used to collect the stator voltage signal u s_abc ，
[0053] The rotor current sensor using the doubly-fed generator rotor windings collects the rotor current signal i r_abc ，
[0054] The doubly-fed generator network side converter current sensor is used to collect the network side current signal i l_abc ，
[0055] The doubly-fed generator network side converter voltage sensor is used to collect the network side voltage s...
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A control method for improving the stability of a doubly-fed wind turbine under the condition of a weak power grid relates to the technical field of doubly-fed wind turbine grid-connected control. The invention aims to solve the problem that the doubly-fed wind turbine is prone to oscillation and instability under the condition of a weak power grid. The present invention comprehensively considers the dynamic characteristics of the inner loop controller, the outer loop controller and the phase-locked loop of the double-fed wind turbine converter to obtain a more accurate grid voltage disturbance compensation coefficient, and simultaneously adds the grid voltage on the rotor side and the grid side Disturbance compensation can effectively improve the stability of doubly-fed wind turbines under weak grid conditions. The invention can flexibly realize different compensation effects by adjusting the coefficients of the rotor-side and grid-side proportional amplifiers, is simple and convenient to use, and can effectively improve the stability of the double-fed wind turbine under different working conditions.
Description
Technical field [0001] The present invention belongs to the field of grid-connected control technology for doubly-fed wind turbines. Background [0002] Since most of the wind farms are remote and far from the load center, large-scale wind power needs to be transmitted over long distances, the grid impedance is large to form a weak grid, and there are distortions, harmonics and other disturbances in the grid-connected line voltage, which in turn affects the stability of the grid-connected system, so how to eliminate the grid-connected line voltage distortion, harmonics and disturbances has become a hot spot in the current research. [0003] In practical work, doubly-fed wind turbines are currently the most widely used types of wind turbines. Studies have shown that grid voltage disturbance under weak grid conditions will affect the phase-locked loop of doubly-fed wind turbines, and transmit the disturbance of grid voltage to the control system of doubly-fed wind turbines, which i...
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IPC IPC(8): H02J3/38
CPCY02E10/76
Inventor 张学广张雅阁邱望明徐殿国
Owner HARBIN INST OF TECH