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Off-grid microgrid group and power balance control method thereof

A technology of microgrid group and power balance, applied in the field of microgrid, can solve the problems of poor power quality, unstable system operation, unbalanced power supply of off-grid microgrid, etc. economic effect

Pending Publication Date: 2021-03-05
JIANGXI THERMAL POWER CONSTR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to overcome the shortcomings of the prior art, provide an off-grid microgrid group and its power balance control method, and solve the problems of unbalanced power supply, poor power quality, and unstable operation of the off-grid microgrid , which improves the adjustment ability and flexibility of the system, and can effectively guarantee the power balance and power supply reliability of the microgrid

Method used

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  • Off-grid microgrid group and power balance control method thereof
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  • Off-grid microgrid group and power balance control method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] refer to figure 1 and image 3 , an off-grid microgrid group of the present invention includes several sub-microgrids, microgrid group control systems and microgrid group power distribution buses 8, each sub-microgrid is connected to each other through the microgrid group control system, each sub-microgrid The microgrids are electrically connected to the distribution busbars 8 of the microgrid group respectively through control switches, and the power transmission circuit between each sub-microgrid and the distribution busbars 8 of the microgrid group is connected with an electric energy bidirectional metering device 9, which is used to measure the power of the sub-microgrids. Electricity sales and purchases.

[0035]Each sub-microgrid includes a sub-microgrid power distribution bus 10, a sub-microgrid control system, a distributed power supply, a backup regulated power supply, an energy storage system, a load, a user terminal, and the output power used to collect dist...

Embodiment 2

[0058] The difference between this embodiment and Embodiment 1 is that the distributed power supply includes a photovoltaic power generation module, a wind power generation module and a small hydropower generation module. The backup regulated power supply includes diesel generators and gas-fired power generation modules.

Embodiment 3

[0060] The difference between this embodiment and Embodiment 1 is: when the power balance cannot be achieved through the charging and discharging adjustment of the energy storage system, if the distributed energy generation power of the sub-microgrid is less than the load demand, and the SOC of the energy storage system is lower than the minimum When the lower limit is 20% or the discharge power of the energy storage system is not enough to meet the load demand, the sub-microgrid load shortage amount P is calculated according to the formula (1) 缺 , and through the sub-microgrid control system, the load demand P 缺 Published on the sub-microgrid control system and notify the users on the load side, each user actively responds to cut off the load power P according to the load demand and its own power consumption characteristics 切 ; if P 切 =P 缺 , to achieve power balance; if the removable load P reported by each user on the load side 切 >P 缺 , the system realizes power balance ...

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Abstract

The invention relates to an off-grid microgrid group and a power balance control method thereof. The off-grid microgrid group comprises a plurality of sub-microgrids, a microgrid group control systemand a microgrid group power distribution bus. Each sub-microgrid comprises a sub-microgrid power distribution bus, a sub-microgrid control system, a distributed power supply, a backup adjusting powersupply, an energy storage system, a load, a user side and a data acquisition unit, and the sub-microgrid control system controls switching and operation of the distributed power supply, the backup adjusting power supply, the energy storage system and the load. And the data acquisition unit and the user side are in communication connection. Power balance is realized through quintuple regulation control of energy storage system regulation, load side active response, microgrid group interaction regulation, non-important load removal and backup regulation power supply regulation, the electric energy quality can be improved, the regulation capability and flexibility of the system are improved, and the power balance and power supply reliability of the microgrid are effectively guaranteed.

Description

technical field [0001] The invention relates to the technical field of micro-grids, in particular to an off-grid micro-grid group and a power balance control method thereof. Background technique [0002] Off-grid microgrid refers to a self-sufficient power supply system constructed using local distributed renewable energy, energy storage systems, loads, and power conversion devices. Off-grid microgrid solves the problem of difficult power supply in remote areas and improves distributed The ability to accept energy promotes green electricity consumption. However, because the off-grid microgrid is separated from the large power grid, it generally has problems such as unbalanced power supply, poor power quality, and unstable system operation. The operating efficiency of electrical equipment is low, the service life is short, and the system security is poor. Ensuring the power balance of the off-grid microgrid is the key to the safe and reliable operation of the microgrid. The...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/28H02J3/14
CPCH02J3/388H02J3/381H02J3/28H02J3/14H02J2300/10H02J2300/24H02J2300/28H02J2310/60H02J2310/64Y04S20/222Y02E70/30Y02B70/3225Y02E10/56
Inventor 徐小勇肖伟超吴昌垣谢光辉汪志斌李刚熊建英
Owner JIANGXI THERMAL POWER CONSTR CORP
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