Grid-connected and off-grid smooth switching and off-grid rolling optimization scheduling method, equipment and medium

A technology of smooth switching and rolling optimization, applied in the field of microgrid, it can solve the problems such as the inability to further separate the power supply and the difficulty in effectively identifying different frequency bands.

Active Publication Date: 2021-08-31
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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  • Grid-connected and off-grid smooth switching and off-grid rolling optimization scheduling method, equipment and medium
  • Grid-connected and off-grid smooth switching and off-grid rolling optimization scheduling method, equipment and medium
  • Grid-connected and off-grid smooth switching and off-grid rolling optimization scheduling method, equipment and medium

Examples

Experimental program
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Effect test

Embodiment 1

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

[0054] Step 1, taking the high-rate characteristic of energy storage as a constraint condition, determine the minimum limit of each load shedding.

[0055] Among them, the high-rate characteristic constraints of energy storage are as follows: figure 1 As shown, the minimum limit of load shedding 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. Assumed energy storage overload capacity The corresponding overload duration is T. After the energy storage is overloaded with S0 for T, there is a The energy storage can be continuously overloaded with S1 for T hours. By analogy, an area surrounded by multiple overload capaciti...

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, the method described in Embodiment 1 is implemented.

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Abstract

The invention discloses a grid-connected and off-grid smooth switching and off-grid rolling optimization scheduling method, equipment and a medium. The method comprises the following steps: taking an energy storage high-magnification characteristic as a constraint condition, and determining a minimum limit value of each load shedding capacity; during load shedding, adjusting slave energy storage output according to dynamic PQ control; determining a grid-connected and off-grid smooth switching strategy based on an energy storage high-rate characteristic constraint condition and the dynamic PQ control; constructing an off-grid rolling scheduling model based on model prediction control, and calculating a control instruction by using the constructed off-grid rolling scheduling model; and filtering a control instruction calculated by the off-grid rolling scheduling model by using a low-pass filtering algorithm, and respectively distributing high and low frequency components to a PQ energy storage engine and a gas engine to finally complete off-grid rolling optimization scheduling. It can be guaranteed that the voltage is always kept at a high level and smooth transition is achieved in the load shedding process, the problem that output adjustment is not timely due to climbing constraint of the gas engine can be avoided, and the off-grid stable operation capacity is improved.

Description

technical field [0001] The invention belongs to the technical field of micro-grids, and in particular relates to a method, device and medium for smooth switching between grid-connecting and off-grid and rolling optimization of off-grid. Background technique [0002] The smooth switching between microgrid grid-connected and off-grid states can ensure the reliable power supply of important loads in the microgrid, which has important research significance. As the off-grid loses the support of the grid in an instant, and the voltage frequency drops, it is necessary to remove part of the load to achieve power balance. A one-time load shedding allows the voltage to return to 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, causing a large overvoltage and affecting the safe operation of the equipment. When t...

Claims

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Application Information

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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
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