A predictive control method for voltage source energy storage to improve the power quality of microgrid
A voltage source type, predictive control technology, applied in the direction of AC network voltage adjustment, circuit devices, AC network circuits, etc., can solve the problems of small micro-grid capacity, harmonic pollution, etc., and achieve the effect of easy implementation and simple control method
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[0056] Embodiment: The theoretical basis and methods involved in the present invention will be introduced in turn below.
[0057] 1. The feasibility of using VESS for harmonic compensation.
[0058] figure 1 The schematic diagram of the structure of the VESS system is shown. The VESS is mainly composed of energy storage elements, DC / DC converters and voltage source converters (Voltages-source-converter, VSC) and other equipment. Among them, the energy storage element is connected in parallel with the DC side of the VSC through a DC / DC converter, and is interfaced with the power system through the VSC. On the one hand, VSC is based on the constant voltage V on the DC side DC , the output voltage waveform of its AC side can be adjusted through switch control to indirectly control its output current i VESSm (m=a, b, c) waveform, so as to realize the four-quadrant power regulation of VESS; on the other hand, the DC / DC converter of the energy storage unit adjusts i ESS magnitud...
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