Microgrid system and control method

A micro-grid and control cabinet technology, applied in the field of micro-grid, can solve problems such as unbalanced calculation errors, achieve high current sharing accuracy, good scalability, and realize the effect of orderly parallel connection

Active Publication Date: 2020-03-31
SHANDONG LUNENG SOFTWARE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the above problems, the present invention proposes a microgrid system and control method, which can improve the information processing speed of the microgrid when processing infor

Method used

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  • Microgrid system and control method

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Embodiment 1

[0065] In one or more embodiments, a microgrid system is disclosed, including: distributed power sources, energy storage systems, and loads; see figure 1 with figure 2 , also includes: 1 set of grid-connected or parallel control cabinet and multiple sets of power storage converters (PCS), the number of power storage converters is N, and N is greater than 1. Among them, the grid-connected or parallel-connected control cabinet has N+2 ports, N ports are connected to the energy storage converter in parallel, 1 grid-connected port, and 1 off-grid port (load port); in some embodiments, it is also possible to leave There is a diesel generator backup port; if there is a diesel generator backup port, a bypass switch should be configured in the grid / connection control cabinet.

[0066] The bypass switch is set between the diesel generator and the load. When the grid fails and the load can no longer obtain energy from the grid, and the system cannot meet any demand, the bypass switch ...

Embodiment 2

[0129] In one or more embodiments, a control method of a microgrid system is disclosed, referring to Image 6 , when the grid-connected or parallel-connected control cabinet works in the grid-connected mode, it specifically includes the following process:

[0130] 1) Collect the three-phase voltage and three-phase current of the grid-connected point;

[0131] 2) Phase-lock the three-phase voltage at the grid-connected point to obtain the operating frequency of the grid;

[0132] 3) The dq transformation module performs αβ / dq transformation on the collected three-phase voltage and three-phase current to obtain the actual total feedback voltage and feedback current in the two-phase synchronous rotating coordinate system;

[0133] 4) The instantaneous power conversion module determines the instantaneous active power and instantaneous reactive power of the grid-connected point according to the obtained actual total feedback voltage and feedback current in the two-phase synchronou...

Embodiment 3

[0143] In one or more embodiments, a control method of a microgrid system is disclosed, referring to Figure 7 , grid-connected or parallel-connected control cabinets work in parallel mode, specifically include the following process:

[0144] 1) Collect the three-phase voltage and three-phase current of the parallel connection point;

[0145] 2) Phase-lock the three-phase voltage of the grid-connected point to obtain the frequency feedback f of the grid-connected point;

[0146]3) The amplitude calculation module obtains the grid-connected point voltage and current feedback amplitudes u and i according to the collected three-phase voltage and three-phase current;

[0147] 4) Take the parallel point feedback frequency f, feedback voltage u and reference frequency f ref = 50Hz reference voltage amplitude u ref =220 or 380V comparison, get the frequency error δf and voltage amplitude error δu, respectively carry out the proportional integral operation to get the frequency coef...

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Abstract

The invention discloses a microgrid system and a control method. The microgrid system comprises a plurality of energy storage converters connected in parallel between a DC bus and an AC bus; the AC sides of the energy storage converters are connected in parallel through an AC bus and then connected with the grid-connected or parallel control cabinet; the grid-connected or parallel-connected control cabinet receives an instruction of a coordination control device of the microgrid and controls the microgrid to work in a grid-connected mode or an off-grid mode; the grid-connected or parallel-connected control cabinet obtains a current component reference value of a current inner loop through outer loop control, and sends the obtained current component reference value to each energy storage converter connected in parallel; and each energy storage converter performs current inner loop operation according to the received current component reference value to obtain a driving signal for driving the switching tube of the energy storage converter to be switched on and switched off. According to the method, the information processing speed of the microgrid during information processing can beincreased, Meanwhile, the problems of respective sampling of each energy storage converter in the microgrid energy storage system and imbalance of outer loop calculation errors can be effectively eliminated.

Description

technical field [0001] The invention relates to the technical field of micro-grids, in particular to a micro-grid system and a control method. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Micro-Grid refers to a small power generation and distribution system composed of distributed power sources, energy storage systems, energy conversion devices, loads, monitoring and protection devices, etc. Because the microgrid has the advantages of low operating cost and less pollution, it has been widely used in real life. [0004] Since the microgrid often needs to switch between the grid-connected operation mode and the off-grid operation mode, the control strategy and response speed of the microgrid are particularly important. However, in the prior art, most of the coordinated control devices of the microgrid are in a centralized control mode, ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/32
CPCH02J3/32H02J3/381
Inventor 黄德旭王培仑石众孙永亮刘爱忠丁玉华丁积德孙久军胡勇任士康杨勇段连君李志高张宗慧
Owner SHANDONG LUNENG SOFTWARE TECH
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