Active power control method of photovoltaic power station

Abstract

The invention discloses an active power control method of a photovoltaic power station. Specifically, the active power control method of the photovoltaic power station includes: calculating active power deviation of a photovoltaic power station grid-connected point; judging whether the active power deviation is in a dead zone threshold value range of power deviation; calculating maximum active power of each photovoltaic inverter; generating an active gain margin queue and an active reduced margin queue; calculating active gain margin sum and active reduced margin sum of all operated adjustable photovoltaic inverters; generating a starting-up queue and a shut-down queue; determining a power adjustment strategy; sending control instructions to the photovoltaic inverters in the station; and returning after the photovoltaic inverters complete instruction actions. The active power control method of the photovoltaic power station automatically enables dispatched active power adjusting instructions to be distributed to each photovoltaic inverter to be executed, greatly reduces labor intensity of operators in the photovoltaic power station and power loss of the photovoltaic power station, and improves response speed of a dispatching power target, economic benefit of the photovoltaic power station and power adjustment accuracy.

Description

Technical field: [0001] The invention relates to a method for controlling the active power of a photovoltaic power station, which belongs to the technical field of photovoltaic power generation. Background technique: [0002] In recent years, photovoltaic power generation has been vigorously developed as a renewable clean energy power generation. With the continuous improvement of the proportion of photovoltaic power generation installed capacity in the total installed capacity, large fluctuations in the power sent by photovoltaic power plants to the grid will have an increasingly negative impact on the stable operation of the power grid. Therefore, to achieve active power of photovoltaic power plants It is an urgent problem to be solved. [0003] At present, the active power adjustment methods used in photovoltaic power stations are mostly manual adjustment methods. Specifically, the grid dispatching department first notifies the photovoltaic power station to adjust the ac...

AI Technical Summary

Problems solved by technology

[0004] 1) Since the above-mentioned photovoltaic power station active power adjustment method is manually completed by the operator, that is, after the operator receives the dispatch adjustment request, the comparison between the target value of dispatch and the actual output value of the photovoltaic power station at this time is obtained by calculation. value, and manually control the start / stop and power up / down of the inverter in the photovoltaic power station according to the comparison difference, so there are problems such as large error and slow response speed, which will cause the loss of power generation of the photovoltaic power station

[0005] 2) The active power adjustment method of the above-mentioned photovoltaic power station does not call and control the inverters in the photovoltaic power station according to the specific working conditions, but the operators start / stop the photovoltaic inverters randomly or Operation of increasing / decreasing power

Therefore, the above-mentioned photovoltaic power station active power regulation method not only highly depends on the reliability of the corresponding inverter, but also ignores the specific working conditions of the photovoltaic inverter due to the random operation of the corresponding photovoltaic inverter (for example, the cumulative operation of the photovoltaic inverter Time, accumulated downtime, etc.), so some inverters will be running for a long time, while others will be down for a long time, resulting in an increase in inverter failure rate

Moreover, the frequent start / stop of the photovoltaic inverter itself will affect its stability and safety, and will also affect the service life of the photovoltaic inverter

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