Abstract
As loads connected to active distribution network (ADN) grow, ADN’s voltage safety issues are becoming more serious. At present, the solution is mainly to build more distributed generation (DG) or to adjust the reactive power in the whole network, but the former needs a lot of investment while the latter requires a large amount of communication equipment and it takes a long time to calculate the adjustment amount of reactive power and to coordinate reactive power compensation equipment. When the loads are heavy, there will still be drawbacks of insufficient reactive power. Therefore, this paper analyzes the relationship between the active power, reactive power, and the voltage in the ADN. Through the autonomous region (AR) division, a voltage control method based on the active power variation and adjustable power in the AR is proposed. According to the relationship between the amount of active power and the adjustable amount active power, the active power control, the reactive power control, and the coordinated control of active power reactive power control are adopted to adjust the DGs’ output to stabilize the bus voltage. The simulation results show that the proposed method can effectively improve the voltage control capability of ADN and can enable it to operate normally under greater power changes. Through the control method in this paper, the communication requirements are greatly reduced and the calculation time is effectively shortened and is more adaptable.
Highlights
At present, global energy crisis and environmental pollution are becoming increasingly serious.As alternatives to traditional energy, renewable energy sources, such as wind power and photovoltaic (PV) generation, have been rapidly developed worldwide
This study presents an active distribution network (ADN) voltage control method based on autonomous region (AR)
All controllable sources and loads in the area operates at a rated capacity and the power factor of wind turbines, PVs, energy storages, and electric vehicles (EVs) must be adjusted to compensate for active power variation
Summary
Global energy crisis and environmental pollution are becoming increasingly serious. Renewable energy power fluctuations and massive access to EVs have made distribution grid voltage problems even more critical. Reference [23] adopts a transformer to increase the voltage margin, but differences still exist between bus voltages in this method To solve this problem, the use of transformers should be increased; the cost of on-load transformers is relatively high, which leads to a sharp rise in the cost of distribution network construction. In Reference [15], through the division of AR, the rapid response of active fluctuations is achieved and the loss is effectively reduced; the balance of reactive power and voltage fluctuation of the distribution network are not considered. The ADN voltage control method based on active and reactive power coordination in AR is proposed. The effectiveness of the proposed method is verified through case studies
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