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Fast control method of planned isolated island power supply switching power balance based on wide range information

A fast control and wide-area information technology, applied in information technology support system, AC network voltage adjustment, single-network parallel feeding arrangement, etc., can solve switching failure, difficulty in switching between voltage control and current control, and does not consider grid connection Operational adaptability, inrush current suppression, etc.

Active Publication Date: 2013-09-11
KUNMING UNIV OF SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing island power conversion adopts different control strategies, such as PQ current control for grid-connected operation and V-f control for independent operation, which meets the needs of planned island operation, but it is difficult to switch between voltage control and current control, and some switching failures Risk, using droop control, the micro power supply control strategy remains unchanged under the two modes of islanding and grid-connected, which conforms to the characteristics of plug-and-play, but does not consider the adaptability of droop control to grid-connected operation and the suppression of inrush current during the grid-connected process

Method used

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  • Fast control method of planned isolated island power supply switching power balance based on wide range information
  • Fast control method of planned isolated island power supply switching power balance based on wide range information
  • Fast control method of planned isolated island power supply switching power balance based on wide range information

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0028] Implementation Mode 1: The system diagram is as follows figure 1 As shown, the size of each distributed power source and load is shown in the table below.

[0029] Table 1 Distributed Power Design Capacity Unit: kW

[0030] gas turbine 20 fan 12 solar energy 10 energy storage 12

[0031] Table 2 Real-time monitoring capacity of distributed power generation Unit: kW

[0032] gas turbine 20 fan 8.1 solar energy 6.5 energy storage 12

[0033] Table 3 Maximum capacity of local load Unit: kW

[0034]

10

3+2+4+2.6=11.6

1+1+1+2+2+2+5+6+12=32

[0035] Table 4 Real-time monitoring capacity of local load Unit: kW

[0036]

10

10

1+1+1+2+2+2+5=14

[0037] =42kW

[0038] =34.6kW (excluding energy storage)

[0039] =34kW

[0040] Power difference =34-34.6=-0.6 kW

[0041] threshold =3.46 kW (here c% ...

Embodiment approach 2

[0043] Implementation Mode 2: The system diagram is as follows figure 1 As shown, the size of each distributed power source and load is shown in the table below.

[0044] Table 5 Distributed Power Design Capacity Unit: kW

[0045] gas turbine 20 fan 12 solar energy 10 energy storage 12

[0046] Table 6 Real-time monitoring capacity of distributed power generation Unit: kW

[0047] gas turbine 20 fan 8.1 solar energy 6.5 energy storage 12

[0048] Table 7 Maximum capacity of local load Unit: kW

[0049]

10

3+2+4+2.6=11.6

1+1+1+2+2+2+5+6+12=32

[0050] Table 8 Real-time monitoring capacity of local load Unit: kW

[0051]

10

10

1+1+1+2+2+2+5+12=26

[0052] =42kW

[0053] =34.6kW (excluding energy storage)

[0054] =46kW

[0055] Power difference =11.4kW

[0056] threshold =3.46 kW (here c% =10%) ...

Embodiment approach 3

[0063] Implementation Mode 3: The system diagram is as follows figure 2 As shown, the size of each distributed power source and load is shown in the table below.

[0064] Table 9 Distributed Power Design Capacity Unit: kW

[0065]

[0066] Table 10 Real-time monitoring capacity of distributed power generation Unit: kW

[0067]

[0068] Table 11 Maximum capacity of local load Unit: kW

[0069]

8

2+2+2+4=10

1+1+1+2+2+2+5=14

[0070] Table 12 Real-time monitoring capacity of local load Unit: kW

[0071]

8

2+2+4=8

1+1+1+2+2+5=12

[0072] =58kW

[0073] =46kW

[0074] =28kW

[0075] Power difference =-18kW

[0076] threshold =4.6kW

[0077] , planning the active power surplus of the isolated island, it is necessary to cut the machine, according to the output of the distributed power supply, optimize the adjustment and form the machine cut plan, so that the power can be q...

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Abstract

The invention relates to a fast control method of planned isolated island power supply switching power balance based on wide range information, and belongs to the technical field of electrical power system protective relaying. The power difference is the difference between the total power of planned isolated island internal loads and the total power of distributed generators, and the switching power on a public coupling point of a planned isolated island and a major network reflects the power difference in the planned isolated island. Before an isolated island operation is switched on, the power difference of the public coupling point, the output power of each distributed generator, the load of each circuit branch and the corresponding on-off state are monitored based on wide range information, and the monitored information is input to a main control unit of the planned isolated island. The main control unit gives a command of breaking or connecting a corresponding breaker according the comparison of the power difference and the setting threshold value, the total power of the distributed generators in the planned isolated island is in optimal matching with the total power of the loads, the requirements of adjustment and operation of the planned isolated island are met, and the planned isolated island is converted into the isolated island operation reliably.

Description

technical field [0001] The invention relates to a fast control method for planned isolated island power supply conversion power balance based on wide-area information, and belongs to the technical field of electric power system relay protection. Background technique [0002] Intentional islanding operation is to determine a reasonable island area in advance according to the capacity of the distributed generator (DG) and the size of the local load. After disconnecting from the main network, the stable operation of the small system can be guaranteed. Planned island operation is a very good fault handling method for distributed generation systems. It not only makes full use of the positive effect of distributed generation on improving the reliability of power supply, but also avoids the impact of distributed generation on power system security through reasonable planning and effective control. The adverse effects of stability can make the power system run more efficiently and r...

Claims

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Application Information

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IPC IPC(8): H02J3/46H02J3/14
CPCY04S20/222Y02B70/3225
Inventor 董俊束洪春徐丙垠王敬华朱梦梦王洪林王明锦
Owner KUNMING UNIV OF SCI & TECH
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