Abstract
This study proposes a novel voltage source converter (VSC)-based voltage dynamic regulatory device based on energy storage and virtual synchronous control, called as a rotating inertia and voltage stiffness compensator (RIVSC), to enhance grid voltage dynamics. In the proposed RIVSC, there is no inner cascaded current control, and the output voltage of the VSC, i.e., inner potential, is directly connected to the grid via a filter. Stiffness characteristic is featured in the inner potential of the RIVSC by the virtual synchronous control. On the basis of the stiffness characteristic, the RIVSC can naturally provide dynamic support for grid voltage. Compared to the traditional synchronous condenser, the proposed RIVSC is more flexible and contributes less short-circuit current. Compared to the existing power electronic-interfaced voltage regulatory device, dynamic support is natural without any time delay, and the proposed RIVSC can improve the dynamic performance of the grid voltage, which is helpful to alleviate the temporary overvoltage at the sending terminal. The basic principle, control methods, and application analysis are presented. Meanwhile, a 10 kW prototype is set up, and the experiment results validate the feasibility and effectiveness of the proposed RIVSC on improving grid voltage dynamics.
Highlights
With more and more renewable energy generations (RES) integrated into the grid, the equivalent inertia of the power system declines and the voltage regulation capability is weakened, which deteriorates the dynamic behavior of grid voltage (Du et al, 2019)
The study proposes a novel voltage source converter (VSC)-based voltage regulatory device based on energy storage and virtual synchronous control, called as the static synchronous condenser (RIVSC)
In the proposed rotating inertia and voltage stiffness compensator (RIVSC), the inner potential is generated by the VSC, which is synchronized with the grid by the active and reactive power controls
Summary
With more and more renewable energy generations (RES) integrated into the grid, the equivalent inertia of the power system declines and the voltage regulation capability is weakened, which deteriorates the dynamic behavior of grid voltage (Du et al, 2019). A traditional synchronous condenser (SC) is installed at the sending terminal to alleviate the temporary overvoltage by its natural dynamic voltage support capability (Teleke et al, 2008), (Mendis et al, 2014), which is a reluctant solution. The virtual synchronous control has been developed for the improvement of grid frequency dynamics, but the impact on grid voltage dynamics is still not discussed, and the specialized reactive power dynamic compensator is still not reported. This study develops the theory analysis of the stiffness compensation and studies a virtual synchronous condenser (RIVSC) simultaneously for stiffness compensation to improve the grid frequency and voltage dynamics like the traditional SC by experiment validation. Different from existing dynamic compensation, the RIVSC can naturally provide dynamic reactive power support prior to the functioning of the local voltage control based on stiffness compensation, which is effective to improve grid voltage dynamics.
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