Transient voltage mismatch risk and load shedding control method with high permeability photovoltaic power grid
DOI：10.7667/PSPC171273
Key Words:high permeability PV  equivalent admittance  transmission sections  transient voltage stability  load shedding control
Author NameAffiliation
ZHANG Hongli NARI Group Corporation State Grid Electric Power Research Institute, Nanjing 211106, China 
LIU Fusuo NARI Group Corporation State Grid Electric Power Research Institute, Nanjing 211106, China 
LI Wei NARI Group Corporation State Grid Electric Power Research Institute, Nanjing 211106, China 
HOU Yuqiang NARI Group Corporation State Grid Electric Power Research Institute, Nanjing 211106, China 
SUN Zhongqing NARI Group Corporation State Grid Electric Power Research Institute, Nanjing 211106, China 
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Abstract:High permeability photovoltaic (PV) integration has seriously affected the voltage recovery after fault. The mismatch risk may exist in load shedding method when the section power is set as the threshold of stability control. Thus, the method coupling with PV integration is proposed for this problem. Firstly, the dynamic variation characteristic of PV equivalent admittance is analyzed and the mechanism of transient voltage stability deteriorated by PV is indicated. Then the discrimination method of voltage instability dominant factor is proposed based on the reactive power changing of PV influx station after fault. When the dominant factor is PV, the equivalent admittance of PV is used as the guidance for the load shedding. When the dominant factor is the section power, there is an approximately linear relationship between the load shedding and sectional power. Finally, a simulation is carried out in practical system. The results show that this method realizes accurate load control for different instability dominant factors, thereby verifying its effectiveness. This work is supported by Science and Technology Project of State Grid Corporation of China “Technical Scheme Research of Accurate Load Control based on Multi-time Scale”.
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