Optimization of Transient Voltage Preventive Control of Receiving-End Power Grid Considering Start-up Unit Measures

Abstract

With the rapid development of ultra-high voltage direct current construction, the replacement effect of conventional power supply at the receiving-end power grid is intensified, and its insufficient reactive power support capacity has become an increasingly serious problem. In order to solve the problem, an on-line optimal decision method for transient voltage security prevention control of the receiving-end grid considering start-up unit measures is proposed. A stage-by-stage optimization strategy is adopted to first switch the reactors and capacitors, then to adjust the reactive power of the units, and finally to start up units. The heuristic algorithm based on the control performance index and the parallel computing platforms are used to meet the computing speed requirement of the online system. The transient voltage control performance indexes of the reactors/capacitors and the reactive power adjustable unit measures are established according to the voltage sensitivity for the weakest transient voltage monitored bus. And the transient voltage control performance indexes of the start-up unit measures are established according to the electrical distance between their high-voltage side buses and the weakest transient voltage monitored bus. The effectiveness of the proposed method is verified by a case study of an actual receiving-end power grid.