A Coordinated Reactive Power and Voltage Control Method for DG Integrated Distributed Network

This thesis conducts an intensive study on the reactive power and voltage characteristics of the active distribution network. Current voltage regulation methods and state of art researches are reviewed in the thesis. The challenge brought by distributed generation for distribution network voltage control is analyzed in this thesis and a corresponding solution is proposed. This thesis develops a coordinated control method of reactive power and voltage control in distribution networks with distributed generations. This control approach includes two modes: online centralized optimization control and local decentralized optimization control. The online reactive power centralized optimization control uses the communication infrastructure to collect the real-time data of the whole network and the local operation data. The local decentralized reactive power and voltage control method does not depend on the strict modeling of the distribution line. This method considers the operation characteristics of the distribution network, energy saving problems and equipment safety issue. It includes three sub-methods: load analysis-based control method, correction power factor-based control method and self-regulated DG based control method. These three methods could meet the requirement for different optimization target priority. The specific implementation schemes of two reactive power voltage control modes are also described in this thesis. Case studies and simulation results are also provided in this thesis to verify the theoretical analysis results. Quantitative results and comparisons are given in the thesis. In the last part of this thesis, some suggestions and research outlook for future work are given