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A control method of distributed power generation in distribution network

A technology of distributed power supply and control method, which is applied in the direction of AC network voltage adjustment, single network parallel feeding arrangement, reactive power compensation, etc. Effect

Active Publication Date: 2022-03-08
MEIZHOU POWER SUPPLY BUREAU OF GUANGDONG POWER GRID CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the transient level, the start-stop or output changes of distributed power sources often cause node voltage fluctuations

Method used

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  • A control method of distributed power generation in distribution network
  • A control method of distributed power generation in distribution network
  • A control method of distributed power generation in distribution network

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0015] figure 1 It is a flow chart of a method for controlling a distributed power supply in a distribution network provided by Embodiment 1 of the present invention. This embodiment is applicable to situations where the output voltage of a distributed power supply exceeds a limit. The method specifically includes:

[0016] S110. Acquiring the voltage value, active power value and reactive power value of multiple distributed power generation units in the distribution network;

[0017] Among them, the distributed power unit is composed of several independent power sources with a power of several kilowatts to tens of megawatts, small and independently compatible with the environment. In the above operation, specifically, the voltage value, active power value and reactive power value of the distributed power generation unit are all measured by related instruments.

[0018] S120. Using any distributed power generation unit as the target control unit, calculate the reactive power ...

Embodiment 2

[0024] figure 2 It is a flow chart of the voltage prevention control operation in the control method of the distribution network distributed power supply provided by the second embodiment of the present invention. This embodiment is applicable to the distributed power supply of the distribution network on the basis of the above-mentioned embodiments. Realization of voltage prevention control method in control. Among them, when a voltage regulation cycle comes, if 2T≥ t a+1 -t a ≥T, the voltage preventive control process is carried out, and the reactive power adjustment value of the target control unit is calculated according to the voltage value, active power value and reactive power value of the target control unit. The method specifically includes the following steps:

[0025] In the current pressure regulation cycle, obtain the planned active power value P of the target control unit G[i] at the next moment a+1 [i]; among them, P represents the active power value, the s...

Embodiment 3

[0061] image 3 Embodiment 3 of the present invention provides a flow chart of the voltage correction control operation in the control method of the distributed power supply of the distribution network. This embodiment is applicable to the distributed power supply of the distribution network on the basis of the above-mentioned embodiments. Realization of the voltage correction control method in the control. Among them, when a voltage regulation cycle comes, if t a+1 -t a a+1 -t a When >2T, the voltage correction control process is carried out, and the reactive power adjustment value of the target control unit is calculated according to the voltage value, active power value and reactive power value of the target control unit. The method specifically includes the following steps:

[0062] S310, if U a [i]≥U max [i], then calculate the reactive power reduction adjustment quantity Q of the target control unit according to the following formula (4): δ_down [i], and transfer ...

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Abstract

The embodiment of the invention discloses a control method of a distributed power supply of a distribution network. The method includes: collecting and acquiring the voltage value, active power value and reactive power value of a plurality of distributed power generation units in a distribution network; taking any distributed power generation unit as a target control unit, and controlling the voltage value, active power value and active power value of the unit according to the target. value and reactive power value, and calculate the reactive power adjustment value of the target control unit and / or non-target control unit; Adjust up or down to stabilize the output voltage of the target control unit. The embodiment of the present invention realizes the voltage stability control in the distributed power supply of the distribution network by controlling the reactive power value in the distributed power supply of the distribution network.

Description

technical field [0001] Embodiments of the present invention relate to electrical control technology, and in particular to a control method for distributed power sources in a power distribution network. Background technique [0002] After the distributed power generation is connected to the distribution network, it not only changes the one-way energy flow characteristics of the traditional distribution network, but also makes the reactive voltage characteristics change significantly both in the steady state and in the transient state. At the steady-state level, the high penetration rate of distributed power generation will affect the overall reactive power and voltage characteristics of the distribution network, and the degree of influence is related to its output, access location, access method and power factor. At the transient level, the start-stop or output changes of distributed power sources often cause node voltage fluctuations. [0003] With the large-scale integrati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/16H02J3/38H02J3/50
CPCH02J3/16H02J3/38H02J3/50Y02E40/30
Inventor 曹德发李志华马明谢明磊李灵勇陈诚伟饶巨为刘怀忠任萌曾晓丹邓文科刘国强彭静邬奇林李延亮
Owner MEIZHOU POWER SUPPLY BUREAU OF GUANGDONG POWER GRID CORP
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