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Hybrid microgrid optimization operation method considering harmonic and voltage imbalance constraints

A technology for voltage unbalance, optimized operation, applied in AC networks with different sources of the same frequency, harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve harmonics and three-phase unbalance, etc. question

Active Publication Date: 2019-12-20
NINGBO POWER SUPPLY COMPANY STATE GRID ZHEJIANG ELECTRIC POWER
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Problems solved by technology

However, there are a large number of single-phase loads and single-phase micro-sources with power electronic devices as the fundamental wave unit in the low-voltage micro-grid, and the problems of harmonics and three-phase unbalance caused by them are becoming more and more serious

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  • Hybrid microgrid optimization operation method considering harmonic and voltage imbalance constraints
  • Hybrid microgrid optimization operation method considering harmonic and voltage imbalance constraints
  • Hybrid microgrid optimization operation method considering harmonic and voltage imbalance constraints

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Embodiment Construction

[0057] The present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0058] A hybrid microgrid optimization operation method considering harmonic and voltage unbalance constraints, comprising the following steps:

[0059] Step 1: Establish a hybrid microgrid optimal operation model, with the lowest operating cost as the objective function, and includes the following constraints: power balance constraints, node voltage constraints, energy storage system operation constraints, harmonic constraints, and three-phase unbalance constraints;

[0060] Step 2 uses the iterative microgrid three-phase power flow calculation method to solve the hybrid microgrid optimal operation model, so as to obtain the fundamental voltage, fundamental current, harmonic current and harmonic voltage of each node that meets the objective function for optimal operation; iterative microgrid The three-phase power flow calculation me...

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Abstract

The invention discloses a hybrid microgrid optimization operation method considering harmonic and voltage imbalance constraints. The method comprises steps that S1, a hybrid microgrid optimization operation model is established, the lowest operation cost is taken as an objective function, and the following constraint conditions of power balance constraint, node voltage constraint, energy storage system operation constraint, harmonic constraint and three-phase imbalance constraint are included; S2, the iterative microgrid three-phase load flow calculation method is adopted to solve the hybrid microgrid optimization operation model, so a fundamental voltage, a fundamental current, a harmonic current and a harmonic voltage, meeting the target function, of each node for optimization operationare obtained; based on the iterative microgrid three-phase load flow calculation method, on the basis of the three-phase fundamental wave load flow, the three-phase harmonic wave load flow of a microgrid is calculated through a linear coupling equation of the harmonic wave current and the fundamental wave voltage. The method is advantaged in that on the premise of considering the safety constraints, optimal operation of the comprehensive cost is realized while the load requirement is met.

Description

technical field [0001] The invention relates to the technical field of optimal operation of a hybrid microgrid. Background technique [0002] As a feasible technical means to accommodate renewable energy, microgrid has attracted much attention. The capacity scale of microgrid is generally small, and the connected voltage level generally does not exceed 35kV. The low-voltage microgrid has the advantages of simple control, flexible operation and low cost, and has become the main direction of microgrid development. However, there are a large number of single-phase loads and single-phase micro-sources with power electronic devices as the fundamental wave unit in the low-voltage micro-grid, and the problems of harmonics and three-phase unbalance caused by them are becoming more and more serious. Therefore, it is of great significance to improve the power quality in the low-voltage microgrid through the optimized operation of the microgrid. The economic operation of microgrid is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/26H02J3/06
CPCH02J3/01H02J3/06H02J3/26Y02E40/40Y02E40/50
Inventor 竺佳一龚向阳王波虞殷树贺旭黄亮王晴朱晓杰华宇肖石琦吴凯胡敬奎
Owner NINGBO POWER SUPPLY COMPANY STATE GRID ZHEJIANG ELECTRIC POWER
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