A method for processing the interface between pq type distributed power supply and distribution network in time domain simulation
A distributed power source, time domain simulation technology, applied in the direction of instruments, control/regulation systems, simulators, etc., can solve the problems of network asymmetry, distribution network operation, power quality, adverse effects of local voltage stability, etc. The effect of simplifying the model form and solving the problem
Active Publication Date: 2017-08-29
STATE GRID CORP OF CHINA +4
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[0003] The distribution network is the most important small and medium-capacity distributed distributed power access network. When the number and capacity of distributed power sources increase, it may be detrimental to the operation of the distribution network, power quality, and local voltage stability. influences
The traditional distribution network has fewer dynamic components, and there is almost no transient research. However, the access of distributed power sources has brought attention to the transient research of distribution networks and microgrids with distributed Transient simulation does not address network asymmetry in depth
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[0040] The present invention provides a PQ type distributed power supply and distribution network interface processing method in time domain simulation, the method flow is as follows figure 1 shown by figure 1 It can be seen that the method includes:
[0041] Step S1, building a three-phase model of a distributed power supply: using an inverter interface type distributed power supply model, and using PQ control as a control strategy; building a PQ type distributed power supply three-phase model includes:
[0042] The source side of the distributed power supply is regarded as a DC voltage source, and the circuit topology of the distributed power supply is mainly composed of a DC voltage source, an inverter and a filter; the grid-connected distributed power supply adopts a PQ control strategy.
[0043] Step S2, establishing a three-phase system model of distribution network with distributed power, which includes:
[0044] The outlet bus of the superior substation of the distri...
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The invention provides a method for processing interfaces of a PQ type distributed power supply and a power distribution network in time-domain simulation. The method comprises the step S1 of constructing a PQ type distributed power supply three-phase model; step S2 of building a power distribution network three-phase system model; step S3 of forming a power distribution network three-phase simplified system to number nodes and branches in the power distribution network three-phase simplified system; step S4 of storing three-phase load parameters of each node according to numbering sequences of the nodes and storing three-phase impedance parameters of each branch according to the numbering sequences of the branches; step S5 of performing per-unit processing on three-phase load parameters of each node and three-phase impedance parameters of each branch; step S6 of performing three-phase load flow calculation for the power distribution network to solve initial value of the time-domain simulation; step S7 of analyzing the characteristics of the distributed power supply model and providing the interface processing method of the PQ type distributed power supply and the power distribution network; and step S8 of selecting step length and simulation time to perform time-domain simulation calculation for the power distribution network of the distributed power supply. The characteristics of the distributed power supply during grid connection are utilized, and the interface processing method of the PQ type distributed power supply and the power distribution network is put forward.
Description
technical field [0001] The invention relates to the field of time domain simulation of power system distribution network, in particular to a method for processing the interface between PQ type distributed power supply and distribution network in time domain simulation. Background technique [0002] Energy is the basis for human survival. With the long-term consumption of old energy sources, human beings are faced with the depletion of conventional energy sources and prominent environmental problems. It is the common responsibility of all mankind to develop clean new energy sources for energy conservation, emission reduction, and improvement of the human living environment. As the main form of utilizing renewable energy, distributed power generation has won rapid development due to the advantages of small investment, clean and environmentally friendly, reliable power supply and flexible power generation methods. [0003] The distribution network is the most important small an...
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IPC IPC(8): G05B17/02
Inventor 黄莉陈璐徐青山杨永标周静嵇文路钟侃王冬王金明
Owner STATE GRID CORP OF CHINA