Power flow optimization method for microgrid considering voltage stability constraints

A technology of voltage stabilization and optimization method, which is applied to AC networks, circuit devices, AC network circuits, etc. with the same frequency from different sources, and can solve problems affecting calculation accuracy, rough DG modeling, and slow calculation speed, etc.

CN106532710BInactive Publication Date: 2019-04-09STATE GRID SHANDONG ELECTRIC POWER
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-04-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a microgrid power flow optimization method considering voltage stability constraint. The method comprises a step of establishing a voltage stability index, a step of establishing the optimization mathematical model of a micro grid considering the influences of a distributed power supply and an energy storage unit, a step of constructing a historical fitting prediction-correction interior point method considering voltage stability constraint based on a prediction-correction interior point method, a step of repeatedly calling a three-phase power flow calculation module in a solution process to carry out three-phase power flow calculation on a microgrid optimization scheme, feeding the obtained voltage stability index to the historical fitting prediction-correction interior point method to carry out optimization processing. The method has the advantages that the historical fitting prediction-correction interior point method is used to process a discrete control variable, the contradiction between the calculation accuracy and iteration efficiency is solved, the method has a better global optimization characteristic, and a prediction-correction interior point method advantage is maintained.
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Description

technical field

[0001] The invention relates to a power flow optimization method of a micro-grid, in particular to a power flow optimization method of a micro-grid considering voltage stability constraints. Background technique

[0002] Optimal Power Flow (OPF) is one of the important means of power system operation and control, and it is also an important part of the power management system. The so-called optimal power flow is when the structural parameters and load conditions of the power system are given, through the optimization of the control variables, find the power flow that can satisfy all the specified constraints and make one or more performance indicators of the system optimal distributed. With the continuous advancement of smart grid construction, clean and efficient renewable energy power generation technology has received extensive attention. In recent years, various distributed generation (Distributed Generation, DG), distributed energy storage unit (Storage...

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Embodiment Construction

[0087] The present invention is described in detail below in conjunction with accompanying drawing:

[0088] Considering the power flow optimization method of the microgrid considering the voltage stability constraints, its specific steps are as follows: figure 1 As shown, firstly, the voltage stability index L is established based on the grid-connected operation characteristics of the microgrid mg ; Then consider the impact of distributed power and energy storage units to establish a multi-objective, multi-constraint optimization mathematical model of the microgrid; based on the prediction-correction interior point method by introducing the continuous optimal target variable obtained by history fitting and using the AMD algorithm Perform node optimization numbering, and construct a historical fitting prediction-correction interior point method that takes into account voltage stability constraints; during the calculation process, the three-phase power flow calculation module i...