Abstract
Original scientifica paper Recently, there has been an increasing interest in using distributed generators (DG) not only to inject power into the grid, but also to enhance the power quality. In this study, a space voltage pulse width modulation (SVPWM) control method is proposed for a synchronous grid-connected controller in a wind-solar-storage micro grid. This method is based on the appropriate topology of the synchronous controller. The wind-solar-storage micro grid is controlled to reconnect to the grid synchronously while maintance or repair is being completed to the power source equation DG at some point, the voltage difference that exists between DG and both sides of the node, a large and sudden electrical surge when DG is reconnected to the grid. It also affects the normal work of the other DG and power quality of a necessary load, and could even seriously paralyze the whole system. So, the topological structure and control method of the synchronous grid-connected controller are discussed in detail and simulation results are presented. The results demonstrate the effectiveness of the proposed method in the synchronous grid-connected controller for the wind-solar-storage micro grid.
Highlights
The distributed generation system (DG) is becoming a vital development direction in many countries and regions
The wind-solar-storage micro grid system structure is shown in Fig. 1, where the micro grid is connected to the medium voltage (MV) alternating current distribution network by ac/dc or dc/ac converters [9, 10]
The control method of SVPWM control after the control of power supply current is basically similar to the sine wave, which can make the output of the DG and the regional power grid have the same voltage amplitude, phase and frequency, realizing the synchronization operation
Summary
The distributed generation system (DG) is becoming a vital development direction in many countries and regions. The micro grid can join the distributed generation and energy storage equipment together through an advanced control system, and form a controllable cell. It operates with the distribution power system connection grid, and can operate independant of the grid [6, 7]. The synchronous grid-connected controller as a bridge between the grid and micro power supply, can play a crucial role for the stable operation of the whole system and the effective distribution of power. The voltage space vector control method is applied to process the dynamic real-time simulation for the synchronous grid-connected controller, and its performance was analyzed. The simulation results demonstrate the viability and effectiveness of the proposed method of reconnecting the DG to the grid
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