Power angle stability control method for doubly-fed wind power grid-connected system considering voltage amplitude and phase changes
A doubly-fed wind power, power angle stability technology, applied in wind power generation, electrical components, circuit devices, etc., can solve problems such as unsatisfactory control effect and ignoring the role of synchronous generator power angle stability
Active Publication Date: 2020-06-12
CHONGQING UNIV
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However, these methods ignore the effect of changes in the grid voltage phase angle on the power angle stability of the synchronous generator, which may lead to unsatisfactory control effects
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[0051] The present invention will be further described in detail below in conjunction with the accompanying drawings.
[0052] Such as figure 1 As shown, the present invention discloses a power angle stability control method of a doubly-fed wind power grid-connected system that takes into account voltage amplitude and phase changes, including the following steps:
[0053] S101. Calculate the maximum allowable operating current constraint of the rotor converter of the doubly-fed wind turbine and the controllable range of the power of the doubly-fed wind turbine under the network constraints. The power of the doubly-fed wind turbine includes the output active power and reactive power of the doubly-fed wind turbine;
[0054] S102. Calculating the system power angle stability evaluation index under the influence of the doubly-fed wind turbine;
[0055] S103. Calculate the active power control reference value and the reactive power control reference value of the doubly-fed wind tu...
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The invention discloses a power angle stability control method of doubly fed wind power grid-connected system considering voltage amplitude and phase change. The method comprises the steps of calculating a maximum allowable operating current constraint of a rotor converter of the double-fed wind power generation system and a controllable range of the double-fed wind power generation system power under the network constraint; calculating the system power angle stability evaluation index under the influence of doubly-fed wind turbine; calculating the active power control reference value and reactive power control reference value of doubly-fed wind turbine; when the doubly-fed wind turbine fails, setting the reference value of the outer power loop of the rotor-side converter of the doubly-fedwind turbine as the control reference value to realize the power angle stabilization control of the system. The invention fully takes into account the changes of the phase and amplitude of the grid voltage during the grid fault, and can accurately reflect the influence of the doubly-fed wind turbine generator system on the power angle stability of the power system. By using the coordinated control of active and reactive power of doubly-fed wind turbines, the power angle stability of power system with doubly-fed wind farms is maximized, and the security and stability of power system are improved.
Description
technical field [0001] The invention relates to the field of power system protection and control, in particular to a power angle stability control method for a doubly-fed wind power grid-connected system taking into account voltage amplitude and phase changes. Background technique [0002] Doubly-fed wind turbines are currently one of the wind power generation equipment with the most commercial prospects, and their penetration rate in the power grid is gradually increasing. The doubly-fed wind turbine adopts the excitation of the power electronic converter, which can adjust the frequency of the excitation voltage in real time according to the different wind speeds, so it can realize the operation within a relatively large wind speed. At the same time, the doubly-fed wind turbine can also adjust the output power according to the different control objectives under fault conditions to meet the needs of grid support. Due to the difference in operating principles and control met...
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IPC IPC(8): H02J3/38
CPCH02J3/386Y02E10/76
Inventor 欧阳金鑫郑迪熊小伏李梦阳唐挺肖超
Owner CHONGQING UNIV