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Isolated microgrid reactive voltage control capacity assessment method and optimization method thereof

A technology of voltage control and micro-grid, which is applied in the direction of AC network voltage adjustment, reactive power compensation, circuit devices, etc., and can solve the problems of frequency difference, voltage amplitude difference, difference, etc.

Active Publication Date: 2019-03-08
SOUTH CHINA UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the island microgrid with peer-to-peer structure controlled by drooping distributed power generation network may have different steady-state values ​​due to the dispersion of different distributed power sources in the system and the difference in droop coefficient, resulting in voltage amplitude difference and frequency Difference

Method used

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  • Isolated microgrid reactive voltage control capacity assessment method and optimization method thereof
  • Isolated microgrid reactive voltage control capacity assessment method and optimization method thereof
  • Isolated microgrid reactive voltage control capacity assessment method and optimization method thereof

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Embodiment 1

[0079] Such as figure 1 As shown, the evaluation method for the reactive power voltage control capability of the island microgrid in this embodiment includes the following steps:

[0080] S1. Combining the operating characteristics of the island microgrid, determine the comprehensive reactive power and voltage control capability index URPCI as a first-level indicator from the dimension of the integrated reactive power and voltage control capability of the island microgrid;

[0081] S2. Under the first-level indicator of the comprehensive reactive voltage control capability indicator described in step S1, construct its second-level indicator;

[0082] The calculation formula of the voltage deviation index VD is as follows:

[0083]

[0084] Among them, U is the effective value of the bus actual voltage, U N is the effective value of the bus rated voltage.

[0085] The calculation formula of voltage fluctuation qualification rate index VF is as follows:

[0086]

[008...

Embodiment 2

[0123] see figure 2 , this embodiment provides an island microgrid reactive power and voltage control capability optimization method, the method uses the URPVCI index obtained by the evaluation method in Embodiment 1 and the equivalent annual investment cost as the objective function, and the distributed power supply capacity and energy storage device The voltage regulation mode is a decision variable, and the microgrid bus power balance constraints and the bus voltage operating range constraints are integrated to construct an optimization model for reactive power and voltage control capabilities, and the multi-objective particle swarm optimization algorithm is used to solve the model, and the reactive power and voltage control that meets multiple objectives is obtained capacity optimization program. Attached below figure 2 , 3 Each step is described in detail.

[0124] In this embodiment, the optimization objective function of the reactive power and voltage control capab...

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Abstract

The invention discloses an isolated microgrid reactive voltage control capacity assessment method. The method comprises the following steps: synthesizing five indexes of voltage deviation, voltage fluctuation, voltage harmonic, static reactive support capacity, transient state reactive support capacity through an analytic hierarchy process, finally obtaining a comprehensive reactive voltage control capacity index; and performing isolated microgrid reactive voltage control capacity assessment by utilizing the index. The invention further provides an optimization method. The optimization methodcomprises the following steps: taking a URPVCI index and uniform annual investment cost solved through above assessment method as a target function, taking distributed power capacity and energy-storage device voltage-regulating mode as the decision variable, synthesizing microgrid bus power balance constraint and bus voltage running range constraint, constructing a reactive voltage control capacity optimization model; performing model solving by adopting a multi-target particle swarm optimization to obtain a reactive voltage control capacity optimization scheme satisfying multiple targets, thereby helping a designer perform planning design.

Description

technical field [0001] The invention relates to the field of voltage control of an isolated island microgrid, in particular to a method for evaluating reactive power voltage control capability of an isolated island microgrid and an optimization method thereof. Background technique [0002] Due to the randomness and volatility of renewable energy output, it is difficult to predict. If it is directly integrated into the distribution network, it will cause the quality of the user's power to decline and threaten the security and stability of the system. Therefore, it is usually effectively integrated in the form of a flexible microgrid, and distributed renewable energy is used to achieve reliable power supply to remote areas. [0003] Microgrids can be divided into grid-connected microgrids and island-type microgrids in terms of types. Grid-connected microgrids mainly rely on the external large grid to support the normal operation of the grid, which can be regarded as a subnet o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/16
CPCH02J3/16H02J2203/20Y02E40/30
Inventor 杜兆斌詹浩钦陈琢王凯
Owner SOUTH CHINA UNIV OF TECH
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