Topology control method for integrated power converter of switched reluctance wind power generator
A technology of generator power and switched reluctance, which is applied in the direction of controlling the generator through the change of the magnetic field, controlling the generator, and controlling the system, etc., which can solve the problems of reduced system efficiency and uncertain output voltage of the switched reluctance generator
Active Publication Date: 2018-03-06
CHINA UNIV OF MINING & TECH
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Problems solved by technology
However, due to the inertia of the generator and the limitation of the wind force, the output voltage of the switched reluctance generator is usually uncertain
Although some literature maintains the output voltage stability by adding a DC / DC converter, it reduces the system efficiency
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[0019] (1) Switched reluctance wind turbine integrated power converter topology
[0020] The integrated power converter of the switched reluctance wind turbine is composed of the switched reluctance generator power converter and the front-end circuit, such as figure 1 shown. The switched reluctance generator power converter is a simplification of the traditional asymmetrical half-bridge power converter, which only needs one MOSFET and one freewheeling diode to control each phase winding of the generator. The front-end circuit consists of excitation power supply, capacitor, inductor and three MOSFETs, diode D 1 ~D 3is the internal parasitic diode of the corresponding MOSFET. For an m-phase generator, the integrated converter only needs 3+m MOSFETs and m diodes; for a traditional asymmetrical half-bridge power converter, it needs 2m MOSFETs and 2m+1 diodes. In most cases, m≥3, so the integrated power converter requires less power devices.
[0021] Taking the A-phase winding...
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The invention discloses a topology control method for an integrated power converter of a switched reluctance wind power generator. The integrated power converter is composed of a switched reluctance generator power converter and a front-end circuit. The switched reluctance generator power converter is short for a traditional asymmetrical half-bridge power converter. The front-end circuit is a Buck / Boost converter that can achieve the energy exchange between an excitation capacitor and an output capacitor. A direct capacitive energy control strategy is adopted for the front-end circuit to stabilize the voltage of the output capacitor, a current chopping control strategy is adopted for the switched reluctance generator to stabilize the voltage of the excitation capacitor, and meanwhile, theclosed-loop control of the output power of the excitation capacitor is introduced to improve the rapidity and accuracy of voltage control of the excitation capacitor. The topological structure of theintegrated power converter is simple. Through a simple control strategy, the optimization of the efficiency and dynamic response of an off-grid switched reluctance wind power generation system can berealized. The method has a broad application prospect.
Description
technical field [0001] The invention belongs to the field of switched reluctance wind power generation, and relates to a topology control method for an integrated power converter of a switched reluctance wind power generator. Background technique [0002] As a new type of electromechanical energy conversion equipment, the switched reluctance generator has a simple structure (no windings or permanent magnets on the rotor), low manufacturing cost, strong fault tolerance, and high operational reliability. It has high efficiency and has been successfully applied in many occasions, especially in harsh environments such as wind power generation. Nowadays, the power generation efficiency and dynamic response of the system are the hotspots in the research of the switched reluctance generator system. There are literatures to improve the dynamic response of generator output voltage (output current) by developing control strategies. There are also literatures that improve the system ...
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IPC IPC(8): H02P9/38H02P9/30
CPCH02P9/305H02P9/38H02P2101/15
Inventor 陈昊王青窦宇宇颜爽
Owner CHINA UNIV OF MINING & TECH