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Microgrid control period stability analysis method and system

A technology of control cycle and analysis method, which is applied in the direction of electrical components, circuit devices, climate sustainability, etc., and can solve problems such as semaphore deviation, microgrid stability, and poor dynamic performance

Active Publication Date: 2021-01-22
INST OF ECONOMIC & TECH STATE GRID HEBEI ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the lack of centralized controllers and the development of open communication methods, especially wireless communication, the control cycle is independently controlled by each distributed power source. In practice, the inconsistency of the control cycle of each distributed power source's independent control leads to semaphore deviation, making the microgrid stable. Relatively poor performance and dynamic performance

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  • Microgrid control period stability analysis method and system
  • Microgrid control period stability analysis method and system
  • Microgrid control period stability analysis method and system

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Experimental program
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Effect test

Embodiment 1

[0100] Such as figure 1 As shown, a microgrid control cycle stability analysis method includes the acquisition of a stable control period of the microgrid, and the acquisition of the stable control period of the microgrid includes the following steps:

[0101] Step A. Establish signal model equations corresponding to different control cycles of each distributed power supply under the DC microgrid;

[0102] Step B. For the signal model equations corresponding to different control periods of each distributed power supply, based on Euler discretization, the corresponding control periods are discretized, and the least common multiple T of all distributed power secondary control periods is selected as an analysis period to establish Discretized characteristic equation;

[0103] Step C. Tracking the trajectory of the critical characteristic root of the discretized characteristic equation according to the analysis period, searching for the characteristic root on the unit circle, jud...

Embodiment 2

[0181] A microgrid control cycle stability analysis method, in which distributed power sources in the microgrid are sequentially marked with numbers 1, 2, ..., n;

[0182] Set the initial value of the control cycle of all the distributed power sources, gradually increase the control cycle of No. 1 distributed power source, and fix the control cycle of the remaining n-1 distributed When sex is switched, record this group of control cycles as the boundary points of the stable domain;

[0183] After determining all the boundary points of the stable region of the control cycle of No. 1 distributed power source under this group of parameters, gradually increase the control cycle of No. 2 distributed power source, fix the control cycles of the remaining n-2 distributed power sources, and calculate the The control cycle stability domain boundary of No. 1 distributed power supply under the group parameters;

[0184] After determining the stable domain boundaries of the remaining k di...

Embodiment 3

[0186] Embodiment 3: A microgrid control cycle stability analysis system, a computer program is stored on the analysis system, and the computer program is executed by a processor to implement the following steps:

[0187] Step A. Establish signal model equations corresponding to different control cycles of each distributed power supply under the DC microgrid;

[0188] Step B. For the signal model equations corresponding to different control periods of each distributed power supply, based on Euler discretization, the corresponding control periods are discretized, and the least common multiple T of all distributed power secondary control periods is selected as an analysis period to establish Discretized characteristic equation;

[0189] Step C. Tracking the critical characteristic root trajectory of the discretized characteristic equation according to the analysis period, searching for the characteristic root on the unit circle, and judging the stability of the microgrid accordi...

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Abstract

The invention belongs to the field of microgrid operation control, and discloses a microgrid control period stability analysis method and system. The method comprises the steps: building a small signal model of a microgrid distributed closed-loop control system, corresponding to different control periods, of each distributed power supply, and obtaining a discrete characteristic equation based on Euler discretization; carrying out critical characteristic root trajectory tracking on a system characteristic equation according to the least common multiple of multiple control periods, and searchingfor possible characteristic roots on a unit circle to calculate the control period enabling the microgrid to be stable. According to the invention, the relation between the control periods of different distributed power sources is studied, a basis is provided for distributed control period selection, average voltage recovery and active power equalization are realized, and the stability and the dynamic performance of the microgrid are improved.

Description

technical field [0001] The disclosure belongs to the field of microgrid operation control, and in particular relates to a method and system for analyzing stability of a microgrid control period. Background technique [0002] Under normal circumstances, the microgrid operates in parallel with the grid, and the large grid provides voltage and frequency support; when unexpected or planned events cause the microgrid to go off-grid, the microgrid will work in an autonomous state. Droop control strategies have gained widespread attention due to the fact that they do not require the domination of distributed generation and tie-line linkages. When the microgrid needs to change from the grid-connected mode to the independent operation mode, each distributed power supply can automatically share the load power in the microgrid. However, since the droop control of the DC microgrid is a proportional difference control, it will cause a steady-state deviation of the voltage, and the effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/00H02J1/10
CPCH02J1/00H02J1/10H02J2203/10H02J2203/20H02J3/388Y02P80/14
Inventor 容春艳张章李军阔李光毅洪吟秋楼冠男吴志
Owner INST OF ECONOMIC & TECH STATE GRID HEBEI ELECTRIC POWER