Photovoltaic inverter reactive voltage control method based on multi-segment reactive voltage curve

Abstract

The invention discloses a photovoltaic inverter reactive voltage control method based on a multi-segment reactive voltage curve. The method comprises the following steps: (1) random modeling of load and distributed photovoltaic power generation; (2) carrying out multi-segmentation on the photovoltaic reactive voltage curve; and (3) reactive voltage coordination control based on a multi-segment voltage-reactive curve. Through a method of mutual coordination of the integrated controller and the local controller, dual-time-scale coordination control of the hour level of an on-load voltage regulation transformer of reactive power voltage equipment and the 15-minute level of photovoltaic and SVG is realized respectively, loss in a power distribution network can be reduced to the maximum extent, voltage distribution can be improved, and the operation margin of other reactive power compensation devices can be improved; according to the invention, the photovoltaic inverter is helped to generate or absorb more reactive power, so that the voltage distribution in the power distribution network is improved, and the robustness is higher.

Description

technical field [0001] The invention relates to reactive power and voltage coordinated control of an active distribution network, in particular to a photovoltaic inverter reactive power and voltage control method based on multi-segment reactive power and voltage curves. Background technique [0002] In recent years, the scale of renewable energy power generation has continued to increase. In order to achieve the "dual carbon goal", the state has vigorously promoted photovoltaics in the entire county. The penetration rate of distributed photovoltaics in various regions continues to increase, but at the same time, it brings problems such as overvoltage and line overload to the distribution network. [0003] In order to solve the problem of voltage exceeding the limit caused by photovoltaic access to the distribution network, there are three general approaches: centralized control, local control, and a combination of centralized control and local control. At the local level, t...

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Problems solved by technology

Some scholars have also proposed the optimization of reactive voltage control, which focuses on minimizing system losses, but since the reactive power output of reactive voltage control is fixed, when the photovoltaic (PV) output power is low, the reactive voltage Control equipment does not provide sufficient reactive power

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