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Alternating current and direct current hybrid micro-grid control architecture and control method

An AC-DC hybrid and control method technology, applied in the field of microgrid, can solve the problems of system stability and reliability deterioration, increase system instability, etc., to achieve the effect of improving stability

Pending Publication Date: 2022-07-29
CEEC JIANGSU ELECTRIC POWER DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since PCS needs to perform complex working conditions such as active power and reactive power adjustment on the AC side, off-grid switching, and frequency modulation, the system will switch multiple times between the PCS stable DC bus and DCDC stable DC bus modes, which will easily lead to system stability. and poor reliability
Especially in the application scenario where multiple microgrids are interconnected, the addition of multiple sources will increase the instability of the system

Method used

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  • Alternating current and direct current hybrid micro-grid control architecture and control method
  • Alternating current and direct current hybrid micro-grid control architecture and control method

Examples

Experimental program
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Effect test

Embodiment 1

[0035] like figure 1 As shown, this embodiment introduces an AC-DC hybrid microgrid control architecture, including:

[0036] High and low voltage conversion power frequency isolation transformer, the high voltage side of the high and low voltage conversion power frequency isolation transformer is connected to the 10kv power grid, and the low voltage side 380VAC is connected to the micro grid system;

[0037] STS transient switching device, the upper level of the STS transient switching device is connected to the low voltage side of the high and low voltage conversion power frequency isolation transformer, and the lower level is connected to the AC side of the PCS device; the internal switch of the STS is closed in the grid-connected mode, and the STS is automatically disconnected in the off-grid mode Disconnect the microgrid system from the large grid for energy self-circulation. After the mains is restored, the STS automatically detects the voltage and phase of the grid, co...

Embodiment 2

[0048] see figure 2 , this embodiment provides a control method for an AC / DC hybrid microgrid control architecture according to any one of Embodiment 1, including:

[0049] In grid-connected or off-grid mode: the PCS connected to the DC bus, the supercapacitor, and the bidirectional DCDC connected to the energy storage battery all work in the DC voltage regulation mode. The maximum power output, once entering the bus high voltage mode, the power optimizer enters the constant voltage limit mode. The wind energy converter works in the same mode as the photovoltaic optimizer. The DC charging pile is charged according to the needs of the vehicle, and at the same time, it is dispatched and operated by the general control system.

[0050]In this strategy, the system is divided into first-level response and second-level scheduling, and the first-level response is ms-level fast response by the module control system. The second-level scheduling is scheduled by the upper-level contr...

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Abstract

The invention discloses an AC / DC hybrid micro-grid control architecture and a control method. The control architecture comprises a high-low voltage conversion power frequency isolation transformer, an STS transient switching device and an AC bus. The PCS device is used for carrying out bidirectional AC (Alternating Current) or DC (Direct Current) energy conversion and active or reactive adjustment in a grid-connected mode; the direct current bus is a direct current output of the PCS device, and the direct current bus is connected with various direct current loads; a photovoltaic panel; a fan; the electric vehicle charging pile is connected to the direct current bus through a bidirectional DCDC and charges the electric vehicle through the energy of the direct current bus; a micro-grid interconnection system; according to the invention, the stability of the system can be greatly improved, and the PCS device only carries out AC side demand function control such as active and reactive demand adjustment, off-grid and grid-connected switching, frequency modulation and the like on the AC side in a grid-connected or off-grid mode.

Description

technical field [0001] The invention relates to an AC-DC hybrid microgrid control architecture and a control method, belonging to the technical field of microgrids. Background technique [0002] With the increasing development of the new energy industry, the application scope of energy storage and microgrid is becoming more and more extensive, especially the application scenarios involving multi-source integration such as photovoltaic, wind power, new energy electric vehicles, etc., the requirements for the control architecture of the entire system are becoming more and more higher. At present, the commonly used microgrid architectures include a common AC bus control architecture, a common DC bus control architecture, and an AC / DC hybrid microgrid control architecture, each of which has its own advantages according to different system requirements. [0003] At present, the commonly used control strategy is that the STS switching device is closed in the grid-connected mode, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/32H02J3/36H02J3/06H02J3/14H02J3/16H02J3/24H02J1/10H02J7/34
CPCH02J3/38H02J3/32H02J3/322H02J3/36H02J3/06H02J3/144H02J3/16H02J3/241H02J1/109H02J7/345H02J2300/24H02J2300/28H02J2207/50
Inventor 周江山钱康朱东升晏阳许文超何梦雪耿路徐怡悦王佐君王欣怡乐小龙彭宇菲刘明涛杨景旭李晓琪
Owner CEEC JIANGSU ELECTRIC POWER DESIGN INST
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