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A method, device, and medium for smooth switching between on-grid and off-grid rolling and optimal scheduling of off-grid

A technology of smooth switching and rolling optimization, applied in the field of microgrid, can solve problems such as difficult to effectively identify different frequency bands, and unable to further separate power sources, so as to avoid damage to equipment due to reciprocating action and achieve reasonable distribution.

Active Publication Date: 2022-05-24
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although MPC is forward-looking, due to the limitations of the MPC algorithm itself, it is difficult to effectively identify different frequency bands of source-load fluctuations, so it is impossible to further separate high and low frequency band fluctuations for power supplies with different response characteristics

Method used

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  • A method, device, and medium for smooth switching between on-grid and off-grid rolling and optimal scheduling of off-grid
  • A method, device, and medium for smooth switching between on-grid and off-grid rolling and optimal scheduling of off-grid
  • A method, device, and medium for smooth switching between on-grid and off-grid rolling and optimal scheduling of off-grid

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Experimental program
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Embodiment 1

[0053] This embodiment provides an on-grid smooth switching and off-grid rolling optimization scheduling method, which includes the following steps:

[0054] Step 1: Determine the minimum limit of each load cut amount with the high rate characteristic of energy storage as the constraint condition.

[0055] Among them, the high rate characteristics of energy storage are restricted as follows figure 1 As shown, the minimum limit value of the load cut amount is shown in formula (1). figure 1 The horizontal axis P represents the active power overload value when the energy storage reactive power is 0; the vertical axis Q represents the reactive power overload value when the active power is 0. Assuming energy storage overload capacity The corresponding overload duration is T. After the energy storage is overloaded with S0, there is a Allows the energy storage to continue to overload T at S1. By analogy, an area surrounded by multiple overload capacities can be obtained. To b...

Embodiment 2

[0092] This embodiment provides an electronic device, including a memory and a processor, where a computer program is stored in the memory, and when the computer program is executed by the processor, the processor implements the method described in Embodiment 1.

Embodiment 3

[0094] A computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, implements the method described in Embodiment 1.

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Abstract

The invention discloses a method, device and medium for parallel-off-grid smooth switching and off-grid rolling optimization scheduling. The method includes: taking the high rate characteristic of energy storage as a constraint condition, determining the minimum limit value of each load shedding; , according to the dynamic PQ control to adjust the energy output from the energy storage; based on the energy storage high-rate characteristic constraints and dynamic PQ control to determine and off-grid smooth switching strategy; The model calculates the control instructions; the control instructions calculated by the off-grid rolling scheduling model are filtered by using the low-pass filtering algorithm, and the high and low frequency components are respectively assigned to the PQ energy storage and the gas engine, and finally the off-grid rolling optimal scheduling is completed. The invention can not only ensure that the voltage is always maintained at a relatively high level during the load shedding process and realize a smooth transition, but also can avoid the problem of untimely output adjustment due to the climbing constraint of the gas engine, and improve the stable operation ability of off-grid.

Description

technical field [0001] The invention belongs to the technical field of microgrids, and in particular relates to a parallel-off-grid smooth switching and off-grid rolling optimization scheduling method, equipment and medium. Background technique [0002] The smooth switching between the grid-connected and off-grid states of the microgrid can ensure the reliable power supply of the important loads in the microgrid, which has important research significance. Due to the instantaneous loss of grid support when off-grid, the voltage and frequency drop, and part of the load needs to be removed to achieve power balance. A one-time load shedding allows the voltage to return to its rated value as quickly as possible. However, this method can only roughly estimate the amount of load shedding. When the amount of load shedding is too large, it will lead to excess electric energy at the moment of cutting off, causing a large overvoltage and affecting the safe operation of the equipment. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/12H02J3/14H02J3/28H02J3/46
CPCH02J3/00H02J3/12H02J3/14H02J3/144H02J3/28H02J3/466H02J2203/10H02J2203/20H02J2310/60Y04S20/222Y02B70/3225
Inventor 李欣然刘小龙卢颖华罗真孟娅刘志谱杨徉
Owner HUNAN UNIV