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Voltage control method and device for power distribution network line containing distributed power supplies

A voltage control method and a distributed power supply technology, which are applied to circuit devices, AC network voltage adjustment, and AC network circuits, and can solve problems such as reduced line stability, undervoltage, and increased equipment adjustment costs

Active Publication Date: 2020-02-28
XUJI GRP +5
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a voltage control method and device for distribution network lines containing distributed power sources, which are used to solve the problems of overvoltage and undervoltage of distribution network lines caused by the access of distributed power sources and the problems in the prior art , by adjusting multiple distributed power sources at the same time, the voltage recovery of each grid-connected point will reduce the stability of the line and increase the cost of equipment adjustment, as well as the problems that require strong communication capabilities.

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  • Voltage control method and device for power distribution network line containing distributed power supplies
  • Voltage control method and device for power distribution network line containing distributed power supplies
  • Voltage control method and device for power distribution network line containing distributed power supplies

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Embodiment 1

[0046] This embodiment takes line overvoltage regulation as an example to illustrate the voltage control method of the distribution network line with distributed power supply in the present invention:

[0047] Such as figure 1 As shown, there are a total of N+1 nodes in the line, which are node 0, node 1, ..., node N in turn. The distributed power supply is connected to the line through the load node. The voltage at node 0 is set as a constant value, and the distributed power supply in the line The node voltage of the access node is U DG1 , U DG2 ,...,U DGi ,...,U DGn , the distributed power output power is P DG1 +jQ DG1 ,P DG2 +jQ DG2 ,...,P DGi +jQ DGi ,...,P DGn +jQ DGn .

[0048] figure 2 is the node voltage state diagram, where 0.95U N ~1.05U N It is the normal range of the node voltage, indicating the normal state. At this time, the voltage of each node in the line is normal, and no voltage adjustment is required; 1.05U N ~1.07U N is the warning range, ...

Embodiment 2

[0061] This embodiment takes line undervoltage regulation as an example to illustrate the voltage control method of the distribution network line with distributed power supply in the present invention:

[0062] figure 2 is the node voltage state diagram, where 0.95U N ~1.05U N It is the normal range of the node voltage, indicating the normal state. At this time, the voltage of each node in the line is normal, and no voltage adjustment is required; 0.93U N ~0.95U N is the warning range, indicating the warning status ( figure 2 The middle and lower warning state is the warning state when the line is undervoltage), and the nodes with voltage within this range may become undervoltage state, so it is necessary to adjust the voltage in advance, but it does not need to be adjusted quickly; 0.85U N ~0.93U N is the emergency range, indicating the emergency state ( figure 2 The middle and lower emergency state is the emergency state when the line is undervoltage). At this time,...

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Abstract

The invention relates to a voltage control method and device for a power distribution network line containing distributed power supplies, and belongs to the field of power distribution network control. The method is characterized by obtaining node voltage of an access node of each distributed power supply in the power distribution network line, and selecting the access node with the node voltage exceeding a normal range and the highest voltage as a guide node; if the voltage of the guide node is in an early warning state, reducing a reactive power value of the distributed power supply at the guide node; and if the reactive power value of the distributed power supply at the guide node reaches the minimum reactive adjustable value and the voltage of the guide node still cannot reach the normal range, reducing the reactive power values of the rest distributed power supplies one by one from near to far according to the distance between the distributed power supplies and the guide node. According to the invention, only a small amount of distributed power supplies are used to adjust the voltage of the guide node to a normal range, and all overvoltage nodes on the distribution network line are gradually recovered to the normal range, so that the reliability and stability of power supply of the distribution network are improved.

Description

technical field [0001] The invention belongs to the field of distribution network control, and in particular relates to a voltage control method and device for distribution network lines containing distributed power sources. Background technique [0002] A large number of distributed power sources, such as distributed photovoltaic power sources and small hydropower, are connected to the distribution network lines, which will cause overvoltage in the lines when the distribution network is under load. It can solve the overvoltage problem of the distribution network line, and can also improve the undervoltage phenomenon of the line during the peak load, and finally realize the stable operation of the distribution network line. [0003] The Chinese invention patent with the notification number CN105490279A discloses a local voltage control method for distributed power sources based on dichotomy. This method collects the voltage of the grid-connected points of distributed power s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/16H02J3/38
CPCH02J3/16H02J3/381Y02E40/30
Inventor 郭宝甫赵江信栗磊曹新慧田盈王卫星苑军军
Owner XUJI GRP
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