Controller of permanent magnet synchronous generator as well as rotor flux linkage online modification method and device
A technology of permanent magnet synchronization and rotor flux linkage, which is applied in the direction of motor generator control, electromechanical transmission control, electronic commutation motor control, etc., and can solve problems such as dependence on generator parameters
Active Publication Date: 2016-11-30
SUNGROW POWER SUPPLY CO LTD
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[0005] The invention provides a controller of a permanent magnet synchronous generator and a rotor flux linkage online correction method and device to solve the problem of relying on generator parameters in the prior art
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[0065]In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0066] The invention provides an online correction method for rotor flux linkage of a permanent magnet synchronous generator to solve the problem in the prior art that it needs to depend on the parameters of the generator.
[0067] Specifically, the online correction method of the rotor flux linkage of the permanent magnet synchronous generator, such as figure 1 shown, including:
[0068] S101. According to the torque-current conversion algorithm during the maximum torque-current ratio control, calculate the torque based on the stator current orientation Coordinate System Shaft stator current given value i s * and power factor angle α;
[0069] S102. According to the orientation based on the stator current Coordinate System S...
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The invention provides a controller of a permanent magnet synchronous generator as well as a rotor flux linkage online modification method and device. The method comprises: according to a torque-current conversion algorithm under maximum torque / current ratio control, calculating to obtain a stator current given value i<s>* and a power factor angle alpha based on the axis as shown in the description of a coordinate system as shown in the description oriented by stator current; according to real-time collected stator three-phase AC, calculating to obtain current stator phase voltage amplitude u<s>; calculating to obtain an average value u<av> of the three-phase voltage according to real-time collected stator three-phase voltage; if a difference value between the u<s> and the u<av> is larger than a preset threshold M, obtaining a modified rotor magnetic linkage formula as shown in the description; repeatedly performing the above process till the difference value between the u<s> and the u<av> is smaller than the M, and finally achieving rotor magnetic linkage online modification on the permanent magnet synchronous generator. According to the controller of the permanent magnet synchronous generator as well as the rotor flux linkage online modification method and device, complex and tedious parameter identification is avoided, influence of generator parameter fluctuation to the maximum torque current ratio control is overcome, optimization of the torque current and the exciting current given value is achieved, and the operation stability of a wind-power generation system is effectively improved.
Description
technical field [0001] The invention relates to the technical field of permanent magnet synchronous generators, in particular to a controller of a permanent magnet synchronous generator and a method and device for on-line correction of rotor flux linkage. Background technique [0002] In the variable-speed constant-frequency wind power generation technology, the direct-drive wind power generation system uses wind turbines to directly drive a multi-pole low-speed permanent magnet synchronous generator (PMSM) to generate electricity, and then incorporates the electric energy converted by the full-power converter into the grid. Compared with the doubly-fed asynchronous motor (DFIG) wind power system, the direct-drive wind power system omits the gearbox and has no direct coupling between the generator and the grid, so it has less energy loss, low maintenance cost, and strong ability to resist grid fluctuations. , high reliability and other advantages, so it has become one of the...
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IPC IPC(8): H02P21/26H02P21/22
CPCH02P21/141
Inventor 王成悦汪令祥杨春源张虎金结红
Owner SUNGROW POWER SUPPLY CO LTD