Coordinated Optimal Reactive Power Control of Renewable Energy Base Considering Grid-forming Energy Storage Station
Compared with traditional thermal power-dominated systems,renewable energy bases that lack synchronous power supply support exhibit low immunity and weak support.The use of grid-forming energy storage station(GFMS)is an effective solution.First,the control principle of GFMS is analyzed,the power adjustment ranges of GFMS under steady-state and dynamic conditions are determined,and a GFMS operation model is established.Then,a coordinated optimal reactive power control strategy considering GFMS auxiliary governance is proposed to adapt to reactive power coordinated optimization and real-time voltage support requirements.In the reactive power coordinated optimization stage,day-ahead and intra-day centralized optimization of reactive power sources is carried out with the goal of optimizing economic efficiency and maximizing dynamic reactive power reserve capacity.In the real-time voltage support stage,a GFMS voltage control strategy is proposed based on voltage support requirements of the grid-connected point.A renewable energy base in the northwest region of China that lacks synchronous power supply support is selected as a case for simulation to verify the effectiveness of the proposed strategy.The results show that the proposed coordinated optimal reactive power control strategy effectively improves the security and stability level of the renewable energy base and gives full play to the role of GFMS.
grid-forming energy storage stationrenewable energy basevoltage stabilityreactive power optimizationvoltage support
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