A static reactive power control method for a photovoltaic power station

Abstract

The invention relates to a photovoltaic power station static reactive power control method comprising the steps that (1) a grid connection point voltage upper limit value U<max>, a grid connection point voltage lower limit value U<min>, an alarm voltage upper limit value U<ha>, an alarm voltage lower limit value U<la>, an inductive power factor lower limit value cosphi<pmin> and a capacitive power factor upper limit value cosphi<nmax> of a photovoltaic power station are set, and the photovoltaic power station is partitioned according to actually measured grid connection point voltage U, reactive power Q and power factor cosphi of the photovoltaic power station; (2) reactive power compensation amount deltaQ of the photovoltaic power station is acquired according to an area in which the photovoltaic power station is positioned; and (3) the reactive power compensation amount of each photovoltaic power generation unit of the photovoltaic power station is determined and reactive power compensation is performed on a power grid system according to the reactive power compensation amount. According to the method, safe and stable operation capacity of large-scale photovoltaic power station grid connection operation for power grid voltage is enhanced, and onsite commissioning correct rate of a photovoltaic power station reactive power control system is also enhanced.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power station control technology for new energy power generation technology, in particular to a static reactive power control method for photovoltaic power station. Background technique [0002] With the emergence of problems such as environmental pollution, petrochemical energy depletion and energy supply security, the development and utilization of renewable energy has attracted more and more attention from the international community. Solar energy is a renewable and clean energy, and photovoltaic power generation is its main form of utilization. Compared with traditional power generation technologies, photovoltaic power generation has the advantages of sustainable energy, safety and environmental protection, and has developed rapidly in recent years. [0003] In order to ensure the safe and stable operation of the grid and reduce the adverse impact of photovoltaic access on the grid, my c...

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Problems solved by technology

[0004] The core of photovoltaic power station’s participation in power system voltage stability control is the accuracy of reactive power control strategy of photovoltaic power station. If the design of reactive power control strategy is unreasonable, the investment in the control system will affect the normal operation of new energy power stations and threaten the security and stability of the power grid.

In order to give full play to the ability of new energy power plants to participate in power system regulation, scholars from various countries have proposed a variety of reactive power control strategies for new energy power plants, including: dynamic reactive power distribution strategies based on sensitivity, and reactive power ratio distribution strategies based on reactive power capacity. The above-mentioned optimal operation control strategy only stays in the simulation stage, and there is no report on field operation. The feasibility and correctness of the control system on-site operation have not been verified, which increases the risk of system failure in operation to a certain extent; again, the new Energy power plants are generally located in remote areas, and their power control systems have a large amount of on-site commissioning, involving many links, long test and verification cycles, and high investment costs. They do not yet have the conditions for large-scale on-site testing, and testing by simulating the on-site environment is currently the A more feasible technical solution, but the existing RTDS and other equipment for closed-loop performance testing of control and protection devices have problems such as high test cost and limited test system scale, and are not suitable for testing reactive power control systems of large-scale photovoltaic power plants.

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