Power coordinated control strategy of concentrating solar power with thermal storage and new energy stations integrated by three-terminal VSC-HVDC
Most new energy bases are connected to high-voltage AC or DC transmission channels through traditional AC methods.In order to solve the problems of small grid connection capacity,high losses,and the impact of new energy power fluctuations on grid stability under AC access methods,a three-termi-nal flexible DC system was constructed for wind-photovoltaic power plants,concentrating solar power(CSP)plants and power grid based on flexible DC transmission grid connection.According to the char-acteristics of DC voltage-active power,a coordinated control strategy among stations suitable for this sys-tem was proposed.The strategy can adjust the output of CSP unit based on the fluctuation of DC voltage of the flexible DC transmission system,so as to suppress power fluctuations of wind and photovoltaic and reduce their impact on grid.For the CSP side converter station,a hybrid control strategy with DC voltage margin droop was adopted to suppress transient overvoltage during control mode switching and improve system response speed through controller parameter configuration.Finally,a simulation model of a three-terminal flexible DC transmission system was established in PSCAD/EMTDC to verify effectiveness of the proposed control strategy.
new energy integrationthree-terminal flexible direct current transmissionconcentrating solar power station with thermal storagepower coordination controlparameter settings
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