Voltage rise inhibition method for medium-low-voltage distribution network comprising photovoltaic access

A low-voltage distribution network and voltage boosting technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve the problem of low utilization efficiency of photovoltaic power sources, and achieve the effects of reducing the loss of abandoned light, improving utilization efficiency, and voltage stability

Inactive Publication Date: 2018-02-02
HUNAN UNIV
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Problems solved by technology

However, due to the phenomenon of light abandonment, the

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  • Voltage rise inhibition method for medium-low-voltage distribution network comprising photovoltaic access
  • Voltage rise inhibition method for medium-low-voltage distribution network comprising photovoltaic access
  • Voltage rise inhibition method for medium-low-voltage distribution network comprising photovoltaic access

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[0058] In order to make the above objects, features and advantages of the present invention more comprehensible, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be pointed out that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all those skilled in the art can obtain without creative work. Other embodiments all belong to the protection scope of the present invention.

[0059] Such as Figure 1-4 As shown, the present invention proposes a method for suppressing voltage rise in a medium and low voltage distribution network including photovoltaic access, including the following steps:

[0060] Step 1. Set the voltage dead zone range of the medium and low voltage distribution network, the maximum allowable reactive power voltage, the maximum allow...

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Abstract

The invention discloses a voltage rise inhibition method for a medium-low-voltage distribution network comprising photovoltaic access. According to the invention, there is no need to modify a line inthe method, and the method comprises the steps: taking a conventional photovoltaic grid-connected inverter topological structure as a base; adding a power adjustment module; setting a Q-U relation curve of reactive power and a grid-connected point voltage; carrying out the corresponding reactive power compensation through the detection of the grid-connected point voltage, thereby achieving a certain voltage-stabilizing effect; estimating an active power value through the active power upper limit calculation when the grid-connected point voltage reaches a maximum allowed voltage, taking the value as the active power upper limit, and reducing the active output of a system correspondingly, thereby achieving a purpose of stabilizing the voltage. The method can guarantee that the system voltageoperates within a rated range, can reduce the photovoltaic-abandoning loss of the system, and improves the permeability of a distributed power supply in a power grid.

Description

technical field [0001] The invention relates to the technical field of distribution network optimization operation and control, in particular to a method for suppressing voltage rise of a medium-low voltage distribution network including photovoltaic access. Background technique [0002] As the penetration rate of PV in the distribution network increases, the power flow of the traditional distribution network will change. As the load at the receiving end is equipped with a photovoltaic power source, it can return the surplus power generated by the photovoltaic power source while meeting its own load needs. It is sent back to the grid, so it becomes the delivery end of energy, so a reverse power flow is generated. Since the voltage of the balance node remains unchanged, the change of the sending end and the receiving end makes the terminal voltage that originally dropped become a voltage rise (Voltage Rise, VR). In the rural distribution network with less load, due to the sm...

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Application Information

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IPC IPC(8): H02J3/48H02J3/50H02J3/38
CPCH02J3/383H02J3/48H02J3/50H02J2203/20Y02E10/56
Inventor 李勇刘嘉彦曹一家王姿雅罗隆福
Owner HUNAN UNIV
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