Power distribution network voltage management method based on voltage regulator and multi-photovoltaic system

Abstract

The invention discloses a power distribution network voltage management method based on a voltage regulator and a multi-photovoltaic system. In a conventional reactive power control method, an inverter must absorb reactive power all day long so as to eliminate overvoltage caused by photovoltaic power reverse power flow. A stepping voltage regulator is often used in a power distribution network toparticipate in system voltage management, so potential overvoltage can also be eliminated by regulating the tapping point position of the SVR. When the SVR participates in system voltage management, voltage fluctuation caused by drastic change of photovoltaic power is relieved by reactive output of the inverter. The invention provides a novel local reactive power real-time control method which isused for relieving the problem of violent voltage fluctuation. Compared with a conventional reactive power control method, the method can remarkably reduce the reactive power compensation burden of the photovoltaic inverter. Because only a small amount of reactive power needs to be injected into the power distribution network, the line loss can be greatly reduced (about 20% is saved), and the capacity of the inverter can be correspondingly reduced, thereby reducing the investment cost.

Description

technical field [0001] The invention proposes a distribution network voltage management method based on a voltage regulator and a multi-photovoltaic system. Background technique [0002] In today's society, in the face of increasingly severe energy and environmental problems, it is no longer a long-term solution to rely solely on fossil energy to supply human daily work. Therefore, the development of renewable energy has become the current mainstream direction in the energy field. In the distribution network system, renewable energy such as light energy is often used to replace traditional fossil energy. The invention is based on the voltage regulator and the multi-photovoltaic system to manage the voltage of the distribution network. Due to the strong randomness, intermittent, fluctuation and uncontrollability of light energy, it is difficult to maximize the utilization of renewable energy. [0003] Now more and more light energy is applied to power distribution system th...

AI Technical Summary

Problems solved by technology

However, the reactive power compensation burden of the photovoltaic inverter in the traditional local reactive power control method (such as Q-P curve) is arduous, which will increase the loss of the inverter and bring greater economic losses

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