Low voltage ride-through control method of permanent magnetic direct drive wind power system under unbalanced network voltage
A low-voltage ride-through and control method technology, applied in the direction of single-network parallel feeding arrangement, etc., can solve problems such as large inductance value of grid-connected reactor, low switching frequency of full-power converter, and complicated calculation process
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[0045] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.
[0046] Such as figure 1 As shown, a low-voltage ride-through control method of a permanent magnet direct-drive wind power system under unbalanced grid voltage, the control method specifically includes the following steps:
[0047] 1) Get the phase θ of positive and negative sequence voltage p , θ n .
[0048]2) Using the positive and negative sequence voltage phases, transform the voltage and current of the three-phase grid into the dq coordinate system, and obtain the positive and negative sequence voltage and current in the dq coordinate system;
[0049] 3) Calculate the DC comp...
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and the phase theta<n> of positive and negative sequence voltages are acquired; second, through the positive and negative sequence voltage phases, voltages and currents of a three-phase network are converted in a dq coordinate system, and positive and negative sequence voltages and currents in the dq coordinate system are obtained; third, through the positive and negative sequence network currents and parameters of a network connection reactor, the active power consumption direct current component deltaP<0>, the cosine component deltaP<c2> and the sine component deltaP<s2> on the network connection reactor are calculated; fourth, the reference value of the direct current component of active power output by an inverter and the reference value of the direct current component of reactive power output by the inverter are acquired; fifth, through the obtained reference values of power, the positive and negative sequence components of the output current of the inverter are calculated; sixth, switching signals are obtained through the positive and negative sequence components of the output current, and the output current and the output power of the inverter are controlled through the switching signals. Compared with the prior art, the low voltage ride-through control method of the permanent magnetic direct drive wind power system under unbalanced network voltage has the advantages of being efficient, easy and convenient to operate and the like.
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