Voltage compensation in weak distribution networks using multiple shunt connected voltage source inverters

Voltage regulation of long weak distribution lines is a challenging problem, particularly when it is not economic to upgrade the entire feeder system. Power electronic converter systems offer an attractive alternative, with their potential to provide both steady state and transient voltage compensation for a limited capital investment. However, operation of these systems with weak networks and/or with multiple distributed installations needs careful attention to avoid unexpected interactions and to achieve optimum regulation performance. This paper explores the use of distributed D-STATCOM compensators to achieve stable steady state and dynamic compensation of the voltage profile along a radial distribution network under widely varying load conditions. Both simulation and experimental results are presented.