Continuous Power Flow Algorithm for Three-phase Distribution Network Considering Distributed Power

Abstract

The invention discloses a three-phrase power-distributing network continuation power flow analysis of the distributed power supply, and belongs to the technical field of electrical power system static voltage stability analysis. According to the three-phrase power-distributing network continuation power flow analysis, by the introducing of the increasing relation between the active power output of load parameter simulation distributed power supply and the load power, a three-phrase power-distributing network continuation power flow equation with the load parameter is established, and a P-V curve of the three-phrase power-distributing network is traced with the method of prediction-parameterization-method correction. The invention also provides an identification method of branch-point type when the distributed power supply is connected. The grid-connected injection current spillage of the distributed power supply in the continuation power flow analyzing process is considered, a node-type bilateral switching logic is adopted to conduct the process, and the running state of the distributed power supply is more close to a real situation, so that the P-V curve of the three-phrase power-distributing network can be traced accurately, the voltage collapse critical point can be calculated accurately, and the branch-point type can be identified accurately.

Description

technical field [0001] The invention discloses a continuous power flow algorithm for a three-phase distribution network considering distributed power sources, and belongs to the technical field of static voltage stability analysis of electric power systems. Background technique [0002] The access of a large number of distributed power sources makes the traditional distribution network change from a single power source radial structure to a complex multi-power source network, and the size and direction of the power flow also change accordingly, which causes new problems of voltage distribution and voltage stability. At present, the research on the voltage stability problem mainly focuses on the transmission network, and seldom involves the distribution network. The continuous power flow method can accurately calculate the static voltage stability point of the system, and can consider certain nonlinear control and inequality constraints at the same time. It is a static voltag...

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Problems solved by technology

[0004] In fact, there are limit constraints on the injection current of each phase in the grid-connected operation of distributed power generation with different control strategies, which need to be considered in the process of continuous power flow calculation. If the traditional local or global parameterization method is used to select the wrong state variable as the continuous parameter, the continuous power flow will diverge at the critical point

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