Reactive optimization method for improving qualified rate of power distribution network comprising distributed photovoltaic power sources

Abstract

The invention discloses a reactive optimization method for improving a qualified rate of a power distribution network comprising distributed photovoltaic power sources. The method mainly comprises the following steps: when the photovoltaic power sources work in an MPPT mode, by taking minimization of whole-network voltage deviations as a target, performing reactive optimization on residual capacities of photovoltaic inverters by use of a particle swarm algorithm; if an optimization result still comprises a node voltage off-limit condition, employing an improved optimization scheme: first of all, under the condition that it is ensured that whole-network voltages are qualified, by taking maximization of total active output of the photovoltaic power sources as a target, obtaining an optimal active value of each photovoltaic power source; and then by taking the result as an active output value of each photovoltaic power source and by taking the minimization of the whole-network deviations as the target, performing the reactive optimization on the residual capacities of the photovoltaic inverters again. According to the invention, operation economic benefits and reliability of the power distribution network are taken into integrated consideration, distribution of active and reactive output of the photovoltaic inverters is optimized, and the voltage qualified rate of the power distribution network comprising the photovoltaic power sources is effectively improved.

Description

technical field [0001] The invention relates to the technical field of reactive power optimization of distribution networks, in particular to a reactive power optimization method for improving the voltage pass rate of distribution networks containing distributed photovoltaic power sources. Background technique [0002] With the increasingly prominent energy crisis, renewable energy is more and more popular, especially solar energy, which is clean, pollution-free, widely distributed and easy to exploit. Photovoltaic power generation is rapidly growing globally as a form of efficient use of solar energy. After the photovoltaic power source is incorporated into the distribution network, the original single power source radial structure becomes a multi-power source structure, which changes the direction and magnitude of the original power flow. getting bigger. At present, some scholars have proposed that the photovoltaic inverter can output a certain amount of reactive power w...

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Problems solved by technology

In addition, since the active output and reactive output of the inverter have a coupling effect on the capacity, when the photovoltaic active output occupies too much capacity, it may happen that all the remaining capacity is used for reactive power compensation and the voltage cannot be adjusted within the specified range.

[0003] However, in the prior art, there is no optimal distribution method for the active output and reactive output of photovoltaic inverters, and it is impossible to achieve the goal of maximum active output of photovoltaic power supply and minimum voltage deviation of the whole network

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