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Active distribution grid load flow calculation method

A technology of active distribution network and power flow calculation, which is applied in the direction of AC network with the same frequency from different sources, and can solve problems such as uncertainty and volatility

Inactive Publication Date: 2017-06-13
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0005] The present invention provides an active distribution network power flow calculation method to solve the problem that the existing power flow calculation method uses deterministic variables and constraints to deal with intermittent DG output, and there are obvious uncertainties and fluctuations

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  • Active distribution grid load flow calculation method
  • Active distribution grid load flow calculation method
  • Active distribution grid load flow calculation method

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Embodiment Construction

[0059] see figure 1 , is a flowchart of a method for calculating a power flow of an active distribution network provided by an embodiment of the present invention.

[0060] An active power distribution network power flow calculation method provided by an embodiment of the present invention uses compensation capacitors (capacitors, C) as reactive power compensation equipment in the active distribution network, and based on the calculation results of the distribution network probability power flow with intermittent DG, The chance constrained programming method is adopted for each time period, and the network loss benefit, emission reduction benefit and voltage quality comprehensive optimization of system optimization operation in all time periods are taken as the planning goal, and the time-varying nature of node load power and intermittent DG output is fully considered. The dynamic reactive power optimization method of distribution network with intermittent DG is used to improv...

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Abstract

The invention discloses an active distribution grid load flow calculation method. The method comprises the steps that network parameters of a power distribution system, nodal load power and relevant parameters of a probabilistic model of the power distribution system are obtained, and a dynamic reactive optimization model of a distribution grid containing intermittent DG is built according to the chance-constrained programming method; according to the load flow calculation method based on the cumulant method, the probabilistic load flow of the model is calculated; according to the configuration information of a compensating capacitor set, the number of control variables is determined, and the control variables are encoded in an integer encoding mode; a genetic algorithm with an elitist strategy is adopted to conduct optimization solution on the reactive optimization model, and node voltages, the phase angle, the branch circuit power and the power loss of the distribution power system are obtained. According to the method, the compensating capacitor set serves as reactive-load compensation equipment, the nodal load power and the time-varying characteristics of the intermittent DG output are taken into full consideration through the reactive optimization method, so that the load flow distribution of the power distribution system tends to be stable, and the running benefit and the voltage quality achieve comprehensive optimization.

Description

technical field [0001] The invention relates to the technical field of distribution network analysis, operation and control, in particular to an active distribution network power flow calculation method. Background technique [0002] Active distribution network (ADN) is a system composed of micro-power sources, loads, energy storage systems and control devices. The active distribution network can combine various types of distributed power generation units to effectively utilize the advantages of a single energy system, realize the complementarity of multiple energy sources, and improve the efficiency, energy utilization and power supply reliability of the entire microgrid system. The distributed generation units connected to the active distribution network include distributed wind generation (distributed wind generation, DWG), photovoltaic cells (photovoltaic, PV) and other intermittent distributed generation (distributed generation, DG), The output of intermittent DG is gr...

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Application Information

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IPC IPC(8): H02J3/06
CPCH02J3/06
Inventor 沈鑫马红升关文举闫永梅唐立军常亚东毛天张林山
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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