| High penetration of Distributed generation (DG) parallel operation has a adversely affect to voltage stability, protection coordination of distribution network, Virtual Power Plants (VPP) model, that coordination operation of multiple DG, is considered to solve this problem of the development direction of the future. This paper research on coordinated and optimize the control system of the framework, coordinated and optimize control model and coordinated control algorithm for the distribution network with VPP operation mode based on DG.This paper has proposed a coordination optimal control framework based on the Agent technology under normal operation mode and voltage control mode of the distribution network with VPP. It focuses on controlling demand of that the three layers of the Agent under the framework of voltage optimization control, organization management layer Agent, coordinated control layer Agent and implementation layer Agent under these two conditions. The paper also sets forth the core part between the basic structures of the Agent, coordination and cooperation ways of multi Agent and communication mode between corresponding Agent. This paper provides the basis for realization of coordination optimization control distribution network with virtual power plant operation model.According to the active power and reactive power coupling in a VPP because of distribution network line impedance is high. A virtual power control method based on coordinate rotational transformation matrix in order to power decoupling. A new voltage droop control strategy is proposed that apply to DG of VPP operating mode, and introduce of fuzzy PID the droop control factor in the Virtual power control strategy to improve the static stability and dynamic response characteristics of the VPP in DG. This paper provides the basis and the specific implementation method to achieve DG control in the VPP. Simple VPP run mode with grid structure simulation analysis to verify the correctness and validity of the proposed fuzzy PID droop control strategy.Use of the DG Agent and conventional surge equipment VPP Agent achieve the coordination of grid voltage control and design the coordination controller based on Multi-Agent coordination control theory in this paper. Multi-agent coordination calm sufficient conditions are given based on the bilinear matrix inequality approach, at the same time coordinated controller optimal design method is given also in the secondary performance indicators. By simulation analysis with voltage coordinated controller IEEE-33node system, the results verify the voltage coordinated controller designed for static voltage stability of the system has greatly improved, and by large disturbance simulation system the voltage coordinated controller design can be quite large operating range of work, that can significantly improve the dynamic performance of the distribution system.Based on the economic optimal control framework of Multi-Agent under normal operation mode of distribution network, this paper proposes a multi-objective optimization model with the objective that active power loss of distribution network is minimum, voltage deviation is minimum and investment costs of DG and conventional surge equipment; by comparing the performance of several different multi-objective evolutionary algorithms, chooses the multi-objective genetic scheduling algorithm(NSGA Ⅱ) with good performance that based on non-dominated sorting with elitist strategy for reactive voltage optimization control on the standard IEEE-33node and IEEE-69node system; when the power system scale is larger, in order to overcome the conventional evolutionary algorithm prone to premature convergence phenomenon, this paper uses cooperation co-evolutionary algorithm based on multi Agent to do the reactive voltage optimization control of power system, and through the simulation of two systems above to compare the advantage of NSGA Ⅱ and cooperative co-evolutionary algorithm. |
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