Abstract
A wide speed range permanent magnet synchronous generator (PMSG) system is studied in this paper, including the PMSG design and comparative study on control strategies with a pulse width modulation (PWM) rectifier, the purpose of which is to regulate the DC-link voltage. It is of great importance to study the foregoing DC power system based on the PMSG and PWM rectifier, where vector control (VC) can be implemented and the corresponding field-weakening strategy can be realized by injecting a field-weakening current component without any auxiliary devices. Large machine inductance is desired in order to limit the short-circuit current and the loaded voltage drop. Different control strategies including VC, direct torque control (DTC) and direct voltage control (DVC) are studied and compared with both simulations and experiments.
Highlights
DC power systems are rather common, which usually consist of one or more power sources[1,2,3,4,5,6,7], e.g., wind turbine in a stand-alone power generation system[2,3], aircraft generator in the more electric aircraft system[4,5], vehicle generators[7]
It consists of the designed and studied permanent magnet synchronous generator (PMSG) driven by a speed-controlled prime mover, and the generated power of the PMSG is regulated by a voltage- controlled pulse width modulation (PWM) rectifier, and the generated DC power is supplied to a DC-link, with a capacitor filter and the load
The PMSG serves as a load of the prime mover, the variation of the working condition of the PMSG will have an impact on the speed of the prime mover
Summary
DC power systems are rather common, which usually consist of one or more power sources[1,2,3,4,5,6,7], e.g., wind turbine in a stand-alone power generation system[2,3], aircraft generator in the more electric aircraft system[4,5], vehicle generators[7]. Mohammed analyzed the performance and the DC-bus voltage control of a wind-powered self-excited induction generator (SEIG) and a three-phase vector-controlled PWM converter[9]. He has studied the DC-bus voltage control for parallel-integrated wind-based PMSG[10,11], e.g., in a sustainable energy conversion system[12]. The VC can have a fixed switching frequency, has complex coordinate transformation calculation and is parameter-dependent Another category of control strategy is the direct torque control (DTC), which regulates the flux linkage vector and further the torque of the PMSG directly, with the estimation of the stator flux linkage and the machine torque[13]. VC, DTC and the proposed DVC are studied and compared through theoretical analysis, simulation and experiments
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