Local voltage control method of high-permeability photovoltaic electric distribution network

Abstract

The invention discloses a local voltage control method of a high-permeability photovoltaic electric distribution network. The method comprises the steps that the voltage of the electric distribution network is monitored, and the voltage out-of-limit condition and a node I with most serious voltage out-of-limit of the electric distribution network are determined; the voltage-active power sensitivity vector of the node I and the voltage-reactive power sensitivity vector of the node I are calculated, wherein the voltage-active power sensitivity vector and the voltage-reactive power sensitivity vector are shown in the description; according to the voltage-active power sensitivity vector of the node I and the voltage-reactive power sensitivity vector of the node I, a photovoltaic adjustment sequence is determined; according to a voltage out-of-limit photovoltaic power adjustment principle and a photovoltaic active / reactive power adjustment margin, a photovoltaic combination and active / reactive output are determined and locally controlled. According to the local voltage control method, the double-quadrant reactive adjustment capacity of a distributed photovoltaic inverter is improved, the photovoltaic power adjustment sequence is determined by using voltage-power flexibility vectors, quick voltage control over the high-permeability photovoltaic electric distribution network is achieved, input and frequent switching of a reactive power compensation device are reduced, and the cost is lowered.

Description

technical field [0001] The invention relates to the technical field of high-permeability distributed photovoltaic access distribution network voltage control, in particular to a control method for distributed photovoltaic on-site voltage control of distribution network. Background technique [0002] With the access of large-scale distributed photovoltaics to the distribution network, the penetration rate of distributed photovoltaics in the distribution network is getting higher and higher. A high proportion of distributed photovoltaic power generation connected to the distribution network greatly changes the operating characteristics of the distribution network, causing the problem of excessive node voltage. When the load demand is large and the photovoltaic power generation is low, the voltage may be too low. While the distributed photovoltaic power generation inverter outputs active power in maximum power tracking (MPPT) mode, it often still has residual capacity and has ...

AI Technical Summary

Problems solved by technology

This type of method requires additional investment in voltage control equipment such as transformers and capacitors, and the cost is relatively high

In addition, due to the volatility and intermittency of distributed photovoltaic output, the frequent voltage fluctuations of the distribution network connected to high-permeability photovoltaics are particularly obvious. Therefore, the existing voltage control and adjustment methods including capacitors and transformers must also be adjusted frequently with voltage fluctuations. In order to prevent the voltage from exceeding the limit, it has a negative impact on the life and regulation effect of various voltage equipment

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