Abstract
For a DC distributed power system, system stability can be predicted by dividing it into source and load subsystems, and then applying the Nyquist criterion to the impedance interaction between the source and load model. However, the generalized Nyquist criterion is extremely complicated and cannot directly reveal effective control strategies to reduce interaction problems of cascade three-phase AC systems. Specifically, as a current force rectifier, this characteristic makes it difficult to judge the stability of a cascade three-phase Vienna AC system. To deal with the aforementioned problems, a simplified small signal stability criterion is presented for an AC distributed power system. Based on the criterion, the small signal model and impedance based on the reduced order model in the d-q domain are studied theoretically. For the instability issue, an impedance regulator design method is presented. The correctness of the simplified stability criterion and the effectiveness of the proposed impedance regulator method are validated by extensive simulation and experiment.
Highlights
In recent years, with the fast development of communications technology, the electric vehicle (EV) charging station and the computer industry, the safe and reliable operation of high voltage direct current (HVDC) power supply systems has become an important research topic all over the world [1, 2]
For the DC distributed power system (DPS), the impedance criterion was first established by Middlebrook, who states that the system stability can be predicted by dividing it into the source and load subsystems, and applying the Nyquist criterion to the ratio between the source output impedance and the load input impedance [7,8,9]
In order to further simplify the theoretical analysis, this paper proposes a simplified stability criterion and an input impedance regulator design method to analyze the interaction problems between three-phase Vienna AC systems and the variable grid impedance
Summary
With the fast development of communications technology, the electric vehicle (EV) charging station and the computer industry, the safe and reliable operation of high voltage direct current (HVDC) power supply systems has become an important research topic all over the world [1, 2]. Power electronic converter systems with regulated output voltage feature negative incremental input impedance, which translates into a constant power load (CPL) behavior. This characteristic may makes the distributed power system (DPS) suffer from small-signal instability issues because of the dynamic interactions between the converters and passive components in the systems [5, 6]. For the AC DPS, there has been much less research
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