Research on voltage optimization under the time-varying characteristics of renewable energy and load

Abstract

Reasonable reactive power and voltage control can greatly lower energy loss during transmission while also increasing the power grid's voltage qualification rate. The comprehensive utilization of various distributed equipment that can regulate reactive power and voltage of power system and the implementation of reactive power global centralized optimization control can effectively improve the voltage quality while ensuring the security and stability of the power grid operation. At present, AVC can only control the current operation state of the power grid. In essence, it is the real-time control after finding that the voltage exceeds the limit or the reactive power flow distribution is unreasonable. In the case of renewable energy and load active power fluctuation, failure to effectively deal with the requirements of the reactive power balancing and voltage control on the grid will lead to frequent repeated adjustment of the equipment, affect the service life of the equipment, and seriously endanger the safe and stable operation of the power grid. With the massive connection of renewable energy sources and the mixed operation of AC and DC power grid, uncertainties on both the source and load side increases, the dynamic characteristics of power grid are complex and changeable, and the problem of reactive power and the regulation of power supply and voltage become more and more prominent. Hence, it makes sense to study the dynamic reactive power optimal dispatching control technology of AC / DC power grid. Considering the change trend of renewable energy and load, comprehensively coordinate reactive power and voltage equipment such as flexible DC, SVC, generator reactive power, capacitive reactor and OLTC to carry out multi cycle coupling dynamic reactive power optimization. Complete scheduling cycle. In this way, the fine control of reactive power and voltage can be realized.