The variable speed pumped storage unit with full-size converter(FSC-VSPSU)is connected to power grid through back-to-back converters,which has the advantages of fast power adjustment and independent decoupling of active and reactive power,so it has attracted wide attention in recent years.Due to the volatility of new energy station,it is usually equipped with static var generator(SVG)to maintain the stability of system voltage,but SVG is also prone to insufficient capacity.Aiming at this situation,the coordinated power control of FSC-VSPSU and SVG is studied,the reactive power regulation characteristics of FSC-VSPSU and SVG are analyzed,and a coordinated power control strategy based on model predictive control(MPC)is proposed.Model predictive control is used to coordinate FSC-VSPSU and SVG with different response times,and the relationship between reactive power and voltage is calculated by voltage sensitivity.A mathematical model of MPC problem is established with the goal of minimum voltage deviation of FSC-VSPSU and point of common coupling,and maximum SVG reserve,and then the power reference values of FSC-VSPSU and SVG are solved.The feasibility of the proposed model predictive control and its superiority over droop control are verified by the simulation.
variable speed pumped storage unit with full-size converterstatic var generatormodel predictive controlpower coordination
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