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Distributed photovoltaic power supply site selection optimization method based on power distribution network probabilistic load flow calculation

A probabilistic power flow calculation and distributed photovoltaic technology, applied in circuit devices, AC network circuits, AC networks with the same frequency from different sources, etc. , increase the network loss of the distribution network, etc., to achieve the effect of improving the stability of the power supply, improving the voltage qualification rate, and improving the scientificity

Inactive Publication Date: 2021-06-18
STATE GRID JIANGSU ELECTRIC POWER CO LTD NANTONG POWER SUPPLY BRANCH +2
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Problems solved by technology

On the one hand, due to the timing mismatch between photovoltaic power generation and load demand, the randomness of regional distribution network power flow increases, thereby reducing the voltage quality of distribution network and affecting the safety of power grid operation; on the other hand, distributed photovoltaic power generation Connecting to the power grid may increase the network loss of the distribution network and affect the economics of power grid operation

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  • Distributed photovoltaic power supply site selection optimization method based on power distribution network probabilistic load flow calculation
  • Distributed photovoltaic power supply site selection optimization method based on power distribution network probabilistic load flow calculation
  • Distributed photovoltaic power supply site selection optimization method based on power distribution network probabilistic load flow calculation

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Embodiment

[0031] Distributed generation (DG) site selection optimization flow chart reference figure 1 As shown, the present invention converts the dynamic multi-objective optimization problem of DG site selection into a multi-scenario static multi-objective optimization problem by using the Monte Carlo simulation method. Such as figure 2 As shown, the VEGA algorithm is used to solve the static problem. In this embodiment, a 10kV distribution network with 15 nodes and distributed power sources in the real world is used as the basic network of the simulation example. Refer to image 3 shown. The specific implementation process is as Figure 4 shown. The solution output by the VEGA algorithm is the non-inferior solution (Pareto solution) with the greatest fitness to the objective function, refer to Figure 5 , 6 shown.

[0032] In this embodiment, a 10kV distribution network with 15 nodes and distributed power sources in the real world is used as the basic network of the simulati...

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Abstract

The invention discloses a distributed photovoltaic power supply site selection optimization method based on power distribution network probabilistic load flow calculation. The method comprises steps that a multi-objective optimization model considering the dynamic characteristics of a power distribution network is constructed, and an objective function and constraint conditions of a multi-objective optimization problem are formulated; a sequential fluctuation rule of load and photovoltaic output is analyzed, and dynamic multi-objective planning is converted into static multi-objective optimization in a probabilistic power flow mode; Latin hypercube sampling is carried out on actual historical operation data of the multi-time-space power distribution network containing the photovoltaic power supply, and a Monte Carlo simulation method is utilized to calculate probabilistic load flow; different access schemes are scored by adopting a probabilistic load flow calculation result, and a distributed photovoltaic power supply site selection optimization scheme considering the dynamic characteristics of a distribution network topology line is obtained in combination with a vector evaluation genetic algorithm. The method is advantaged in that in a typical scene of any switch state combination, reduction of voltage deviation, voltage fluctuation and network loss after access can be realized.

Description

technical field [0001] The invention relates to the technical field of photovoltaic planning, in particular to a distributed photovoltaic power source site selection optimization method based on distribution network probabilistic power flow calculation. Background technique [0002] With the rapid development of distributed generation technology, the problems caused by photovoltaic and other distributed generation (Distributed Generation, DG) connected to the distribution network cannot be ignored. On the one hand, due to the timing mismatch between photovoltaic power generation and load demand, the randomness of regional distribution network power flow increases, thereby reducing the voltage quality of distribution network and affecting the safety of power grid operation; on the other hand, distributed photovoltaic power generation Connecting to the power grid may increase the network loss of the distribution network and affect the economy of the power grid operation. At t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20
Inventor 周嘉王栋徐晓轶蔡超韩俊蒋玮陈颢元
Owner STATE GRID JIANGSU ELECTRIC POWER CO LTD NANTONG POWER SUPPLY BRANCH
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