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A microgrid control cycle stability analysis method and system

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

Active Publication Date: 2022-07-05
INST OF ECONOMIC & TECH STATE GRID HEBEI ELECTRIC POWER +2
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  • 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

Method used

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  • A microgrid control cycle stability analysis method and system
  • A microgrid control cycle stability analysis method and system
  • A microgrid control cycle stability analysis method and system

Examples

Experimental program
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Effect test

Embodiment 1

[0100] like figure 1 As shown in the figure, a method for analyzing the stability of a microgrid control period 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 of each distributed power source corresponding to different control periods under the DC microgrid;

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

[0103] Step C. Perform critical characteristic root trajectory tracking on the discretized characteristic equation according to the analysis period, search for charact...

Embodiment 2

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

[0182] Set the initial value of the control period of all the distributed power sources, gradually increase the control period of the distributed power source of No. 1, and fix the control period of the remaining n-1 distributed power sources unchanged, and judge the stability of the microgrid. When stability occurs During sex switching, record the group of control periods as the boundary point of the stability domain;

[0183] When all the stable domain boundary points of the control period of No. 1 distributed power generation under this group of parameters are determined, gradually increase the control period of No. 2 distributed power generation, fix the control periods of the remaining n-2 distributed power sources, and calculate the The control cycle stability domain boundary of No. 1 distributed power gen...

Embodiment 3

[0186] Embodiment 3: a microgrid control period stability analysis system, the analysis system stores a computer program, and the computer program implements the following steps when executed by a processor:

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

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

[0189] Step C. Carry out critical characteristic root trajectory tracking on the discretized characteristic equation according to the analysis period, search for the characteristic root on the unit circle, discriminate the stability of th...

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Abstract

The present disclosure belongs to the field of microgrid operation control, and discloses a method and system for analyzing the stability of a microgrid control period, establishing a small signal model of a microgrid distributed closed-loop control system in which each distributed power source corresponds to different control periods, and based on Euler discretization Obtain discrete characteristic equations, track the critical characteristic root locus of the system characteristic equations according to the least common multiple of multiple control periods, search for possible characteristic roots on the unit circle, and then calculate the control period to stabilize the microgrid, and control the control between different distributed power sources. The relationship between cycles is studied to provide a basis for the selection of distributed control cycles, to achieve average voltage recovery and active power equalization, and to improve the stability and dynamic performance of microgrids.

Description

technical field [0001] The disclosure belongs to the field of microgrid operation control, and in particular relates to a microgrid control period stability analysis method and system. Background technique [0002] Under normal circumstances, the microgrid operates in parallel with the grid, and the large grid provides voltage and frequency support; when a sudden or planned event causes the microgrid to be disconnected from the grid, the microgrid will work in an autonomous state. Droop control strategies have gained a lot of attention because they do not require dominant DGs and connections between tie lines. When the microgrid needs to change from the grid-connected mode to the independent operation mode, each distributed power source can automatically share the load power in the microgrid. However, since the droop control of the DC microgrid is proportional and differential control, it will cause a steady-state deviation of the voltage, and the effect of active power dis...

Claims

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Application Information

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Patent Type & Authority Patents(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
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