Experimental evaluation of DG's dynamic voltage support capability improving short‐term voltage stability on power system loads

Abstract

SUMMARYHigh DG penetration will seriously degrade the short-term voltage stability of the load in bulk power systems. Simulation results in previous studies by the authors have shown that the dynamic voltage support (DVS) capability of a DG improves stability, but experimental evaluation does not yet exist. This paper presents the effects of the DVS capability of a DG on an experimental circuit consisting of an induction motor, a resistance load, and a compensation capacitor behind a reactance. First, an experimental setup that causes voltage instability without DVS is set up. Second, an improvement in DG inverter control is made in order to achieve a low-voltage ridethrough (LVRT) capability and DVS capability, and the DG's performance is confirmed by voltage sag tests. Finally, the tests on the experimental setup demonstrate that the DVS capability greatly improves the short-term voltage stability of power system loads, and the experimental results agree well with the simulation results.

Development of Solar Inverter with FRT and DVS Capabilities

“…It is recommended that PV's as well as synchronous generators should have the capabilities of FRT/DVS. These capabilities are required for wind power generators by grid codes in Europe and U.S.A. A number of papers on FRT of wind power generators have been reported, but there are not so many papers of solar inverter on FRT, especially DVS [1][2][3].…”