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Off-network-type microgrid black-start method

A technology of micro-grid and black start, applied in the direction of single-grid parallel feeding arrangement, etc., can solve the problems that the system operation cannot reach the expected stable state, the inverter control accuracy is poor, and the inverter power output deviation is large, etc.

Active Publication Date: 2014-09-10
CHINA ELECTRIC POWER RES INST +2
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  • Abstract
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AI Technical Summary

Problems solved by technology

It is easier to switch between the PQ control mode and the Droop control mode for the converter using the current source Droop control mode. The power output of the converter deviates greatly from the actual demand of the system, and the system operation cannot reach the expected stable state

Method used

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Embodiment Construction

[0056] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0057] Such as figure 1 , provide an off-grid microgrid black start method, the method includes the following steps:

[0058] Step 1: Start the V-F mode of the first energy storage self-synchronous voltage source converter, and switch from V-F mode to Droop mode;

[0059] Step 2: Start the second energy storage self-synchronizing voltage source converter in voltage source synchronous mode, and switch from voltage source synchronous mode to Droop mode;

[0060] Step 3: Repeat step 2 to enable the subsequent energy storage self-synchronous voltage source converter to be connected to the system for operation, and to realize the black start of the off-grid microgrid.

[0061] Described step 1 comprises the following steps:

[0062] Step 1-1: Start the V-F mode of the first energy storage self-synchronous voltage source converter; figure 2 , in the V-F mode o...

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Abstract

The invention provides an off-network-type microgrid black-start method. The method includes: according to real-time states of a system, controlling energy-storing self-synchronization voltage source current converters to run in different modes; and realizing black-start of an off-network-type microgrid through smooth switching among different running modes of multiple energy-storing self-synchronization voltage source current converters. Reliability of networking for power supply of the energy-storing self-synchronization voltage source current converters is improved. By the control method, black-start of the microgrid networked by the energy-storing self-synchronization voltage source current converters can be realized, and safety and stability in running of the system can be guaranteed.

Description

technical field [0001] The invention relates to the operation and control of a microgrid, in particular to an off-grid microgrid black start method based on the common networking of multiple energy storage self-synchronizing voltage source converters. Background technique [0002] A microgrid is a collection of distributed power sources, energy storage units, loads, and control and protection devices. It is an autonomous system capable of self-control, protection, and management. According to the connection relationship between the microgrid and the large power grid, the microgrid is divided into a networked microgrid and an off-grid microgrid. For the black start process of the networked microgrid, due to the voltage and frequency support of the large power grid, each distributed The power supply, energy storage unit and load can be directly connected to the grid to complete the black start of the networked microgrid; for the black start process of the off-grid microgrid, b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
Inventor 李光辉鲍薇何国庆孙艳霞冯凯辉赵伟然
Owner CHINA ELECTRIC POWER RES INST
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