Abstract
By analyzing the mechanism of the low voltage ride through on the permanent magnet direct drive synchronous wind power generating units, this paper proposes a coordinated control strategy for permanent magnet synchronous generator. In order to avoid over speed operation of the generation units, over voltage on DC capacitor and over current on convert, the improved pitch angle control and inverter control are used. When the grid voltage drops, the captured wind power is cut down by the variable pitch system, which limits the speed of the generator, the generator side converter keeps the DC capacitor voltage stabile; and the grid side converter provides reactive power to the grid to help the grid voltage recover. The control strategy does not require any additional hardware equipment, with existing control means, the unit will be able to realize low voltage ride through. Finally, based on Matlab/Simulink to build permanent magnet direct drive wind power generation system, the simulation results verify the correctness and effectiveness of the control strategy.
Highlights
As an important new energy power generation, wind power generation rapidly develop in China
After a lot of Permanent Magnet Synchronous Generator (PMSG) connected to the grid, if you do not LVRT capability, when the grid fails, the unit will be a large area off the network, causing a tremendous impact on the stability of the grid [5], [6]
Domestic and foreign research workers have done a lot of research on the low voltage ride through of PMSG
Summary
As an important new energy power generation, wind power generation rapidly develop in China. Literature [7]-[9] by adding unloading resistance or energy storage element to ensure the unit PMSG in low voltage ride through, but additional hardware increases system cost and maintenance difficulty [10], [11]. Using the pitch control system, reduce the fan captured during grid fault wind energy, in order to avoid generator over speed; Monitoring DC bus voltage, once the capacitor voltage reaches the threshold, the controller responds quickly and avoids DC capacitor; according to the degree of grid voltage drop, providing dynamic reactive power to grid converter side through the network, to help restore the grid voltage
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