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Operation control method of distributed power supply of active power distribution network

A technology of active distribution network and distributed power supply, which is applied in the direction of single-network parallel feeding arrangement, electrical components, circuit devices, etc., and can solve problems such as failure of operation mode conversion, hidden dangers of active distribution network safety operation, and large system impact

Active Publication Date: 2014-04-16
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

[0004] However, the switch of DG control method will bring a large impact on the system, and even cause the failure of the operation mode conversion, which brings hidden dangers to the safe operation of the active distribution network.

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  • Operation control method of distributed power supply of active power distribution network
  • Operation control method of distributed power supply of active power distribution network
  • Operation control method of distributed power supply of active power distribution network

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Embodiment Construction

[0048] The present invention will be further described below in conjunction with accompanying drawings and examples.

[0049] For the active distribution network distributed power operation control method, its steps are:

[0050] Step 1, there are m sets of DG in the active distribution network, and in the low-voltage distribution network, the connection line from DG to grid-connection point is resistive;

[0051] Step 2, take f n , U n are the reference values ​​of operating voltage frequency and amplitude of the active distribution network, P n（k） , Q n(k) are the reference values ​​of output active power and reactive power of the k-th DG, respectively, P （k） , Q (k) are the actual output active power and reactive power of the kth DG, respectively, m （k） , n (k) is the droop coefficient of the kth DG, f * （k） , U * (k) It is the reference value of output voltage frequency and amplitude of the kth DG. The traditional droop control equation is:

[0052] ...

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Abstract

Disclosed is an operation control method of the distributed power supply of an active power distribution network. For a low-voltage power distribution network, when the system in a traditional droop control method reaches a steady state, the output power is relevant to the errors of voltage frequency and amplitude. The method replaces the power with current in Park transformation; by means of appropriate transformation, droop control can be equivalent to 'constant power control' with reference current superposed with parts of frequency errors and parts of voltage amplitude errors; through the control of the error information, different operation requirements of two operation modes on DG (distributed generation) can be met. The operation control method of the distributed power supply of the active power distribution network is applicable to a grid-connected operation mode as well as an isolated island operation mode of the active power distribution network, can omit switch of control methods and accordingly can guarantee smooth conversion of the operation modes of the active power distribution network.

Description

technical field [0001] The invention relates to an operation control method of a distributed power supply in an active distribution network, in particular to an operation control method of a distributed power supply applicable to both grid-connected and islanded operation modes of the active distribution network. Background technique [0002] In recent years, Distributed Generation (DG) technology has been more and more widely used due to its significant economic and environmental benefits. With the large-scale access and application of DG in the distribution network, the passive consumption method of the traditional distribution network is difficult to apply, which seriously limits the high penetration of DG. Aiming at the access problem of distributed power in distribution network, active distribution network technology has been proposed and has received extensive attention. The active distribution network is a distribution network capable of combining and controlling var...

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Application Information

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IPC IPC(8): H02J3/00H02J3/38
Inventor 李兰芳王玲盛超梅桂华胡巨杨洪耕李媛
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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