Reactive voltage dispersion coordination control system based on distributed photovoltaic power supply

Abstract

The invention discloses a reactive voltage dispersion coordination control system based on a distributed photovoltaic power supply. The reactive voltage dispersion coordination control system comprises a grid-connected inverter, a plurality of groups of electric reactors, and a plurality of groups of capacitors, wherein the grid-connected inverter adopts PV to control to output quantitative activepower, and distributes reactive power among the inverter, the electric reactor group and the capacitor group according to a coordination control strategy logic, so that the grid-connected point voltage is kept within a set range, wherein the coordination control strategy logic is that: whether the idle reactive power of the inverter is lower than a warning line or not is monitored in real time, and if so, the two conditions are divided according to the reactive power property output by the inverter in order to carry out different processing modes. According to the method, the grid-connected inverter is subjected to dynamic fine compensation of reactive power, and the capacitor group and the electric reactor group are subjected to dynamic coarse compensation of reactive power; and the voltage level of the system is guaranteed under the support of the designed reactive compensation control system, and the problem that slightly high or low voltage deviation possibly occurs in a distributed photovoltaic power distribution line in the system is solved.

Description

Technical field [0001] The invention relates to electric power engineering technology, in particular to a reactive voltage distributed coordinated control system based on distributed photovoltaic power sources. Background technique [0002] In recent years, the proportion of photovoltaic power generation in the world's total energy has gradually increased. It is currently one of the fastest growing and most promising renewable energy industries. However, because photovoltaic power generation is greatly affected by temperature and light intensity, the output of photovoltaic power generation has intermittent and uncertain characteristics, which makes the utilization rate of photovoltaic grid-connected inverters only about 20%, and frequent switching will also Decrease the stability of the power grid, bring various disturbances to the distribution network, and affect power quality. Moreover, photovoltaic power plants generally only output active power and not generate reactive powe...

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Problems solved by technology

However, since photovoltaic power generation is greatly affected by temperature and light intensity, the output of photovoltaic power generation has the characteristics of intermittent and uncertain, which makes the utilization rate of photovoltaic grid-connected inverters only about 20%, and frequent switching Decrease the stability of the power grid, bring various disturbances to the distribution network, and affect the power quality

Moreover, photovoltaic power plants generally only output active power and do not generate reactive power. However, the electric load in the distribution network not only absorbs active power but also absorbs reactive power. The loss of electric energy not only reduces the power supply efficiency but also causes voltage fluctuations.

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