| With the continuous development of technology and the depletion of traditional fossil fuels, the importance of renewable energy power generations has been deeply aware of. However, the integration of distributed generations (DGs) also has certain impacts on the traditional distribution network such as changing voltages, increasing the short-circuit capacity of the power grid, complicating the relay protection strategy and affecting the reliability of the power supply. In addition, due to the integration of the DGs, the voltage fluctuation becomes relatively larger and the power quality is also affected. Therefore, in order to maintain the safe operation status of the active power distribution network, not only the structure of renewable energy on the primary side of power grids needs to be optimized, but also a coordinated control strategy of voltage and reactive power compensation is required. According to the characteristics of the active distribution network, this paper presents a hybrid reactive power compensation device which combines a SVG and a TSC in parallel. Combined with the voltage coordinated control strategy, the proposed compensation device can control the voltages and reactive power in the active distribution network so that the voltage demand of the users of each node can be met and the outputs of the generators and power loss on lines can also be reduced.Finally, the reactive power compensation and the regulation of the reactive power of the hybrid reactive power compensation device are studied by simulation. It is found that hybrid reactive power compensation device can effectively improve the distribution of active power distribution network and compensate the vacancy of reactive power, thus effectively solving the problem of voltage offset. The simulation also indicates that the scheme can enhance the stability of active distribution network and further improve the reliability of power supply. |
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