A distributed photovoltaic grid-connected collaborative control method and system for preventing voltage from exceeding the limit

Abstract

The invention discloses a distributed photovoltaic grid-connected collaborative control method and system for preventing voltage from exceeding the limit. Back-to-back converters are used to control the reactive power of the local load at the grid-connected point of the distributed photovoltaic power generation system, and the photovoltaic grid-connected inverter is controlled. The working status of the system limits the output power of distributed photovoltaic power generation, and the braking control link is set to form a coordinated control system to adjust the voltage of photovoltaic grid-connected points. When the voltage exceeds the limit, the local load reactive power control of photovoltaic grid-connected points takes effect first, avoiding the consumption of photovoltaic power generation by the distribution network ability impact. The invention can effectively solve the voltage limit problem of distributed photovoltaic grid-connected points, and maximize the ability of the distribution network to accommodate photovoltaic power generation.

Description

technical field [0001] The invention relates to a new energy power generation grid-connected control technology, in particular to a distributed photovoltaic grid-connected coordinated control method and system for preventing voltage from exceeding the limit. Background technique [0002] Due to the grid-connected operation of a large number of distributed photovoltaic power generation systems, the proportion of photovoltaic power generation capacity to the total system capacity is getting higher and higher, and the impact on the power system is gradually increasing. The voltage limit problem of photovoltaic grid-connected points is an important factor affecting the safety and stability of the power grid. When the voltage exceeds the limit, giving the system dynamic reactive power support can effectively improve the voltage limit of the photovoltaic grid-connected point and improve the safety and stability of the grid-connected distributed photovoltaic power generation system...

AI Technical Summary

Problems solved by technology

[0003] Although limiting the active power output of photovoltaic grid-connected inverters is an effective measure to deal with insufficient reactive power adequacy, it does not take into account the impact on the penetration rate of distributed photovoltaic power generation systems, and cannot maximize reactive power on the basis of ensuring reactive power requirements. Reduce light rejection

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