Abstract
Power systems have developed significantly because of the increasing share of renewable energy sources (RESs). Despite the advantages, they also bring inevitable challenges to power system stability, especially under extreme fault conditions. This paper presents a practical active support control strategy for RESs to support the power grid under extreme fault conditions. The proof process is taken in an AC-DC hybrid power grid integrated with large capacity of PV stations and wind farms. The on-site engineering test results reflect that RESs bring potential risks in the AC-DC hybrid power grid operation and validate the excellent engineering practical features of the proposed control strategy. In addition, test results also reveal predisposing factors of power system instability which are missing in the simulation and fault simulation device-based testing results. They prove the outstanding advantages of on-site engineering tests.
Highlights
Power systems see more and more photovoltaic (PV) and wind generation integration
Where ULV is the threshold of Low-voltage ridethrough (LVRT), UT is the voltage per unit value at the access point, K1 is the current coefficient for reactive power control, and IN is the rated current of the equipment
Where UHV is the threshold of High-voltage ridethrough (HVRT), UT is the voltage per unit value at the access point, K3 is the current coefficient for reactive power control and its recommended value is over 1.5, and IN is the rated current of the equipment
Summary
Power systems see more and more photovoltaic (PV) and wind generation integration. Within increasing renewable energy source (RES) penetration level, despite the advantages such as environmental friendly and sustainable development, it brings problems to the utility grid [1,2,3]. Primary frequency regulation is insufficient in a weak AC/DC hybrid power system, which makes high frequency problem an ineluctable challenge for RESs operation Under this condition, the PV inverter, wind power generator, SVC, SVG in the PV station, and wind farm should maintain grid-connected operation. Insufficient voltage control ability of the power system brings high-voltage challenge to RESs. In the steady state, the PV inverter, wind power generator, SVC, SVG in the PV station, and wind farm operate in the grid-connected mode, and they provide dynamic support to the power system during the transient state. Provide dynamic support to the power system simultaneously. e high-frequency resistance control strategy is designed as
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