Active power control method and device for photovoltaic power station

Abstract

The invention provides an active power control method and device for a photovoltaic power station. The method comprises the steps of judging an active instruction according to the current active powervalue acquired in advance, calculating the difference value between the instruction power and the current active power, judging the relation between the difference value and the power control dead zone, checking the active instruction according to the active control locking working condition, checking whether the active instruction is in the active power output range of the photovoltaic power station or not, assigning the active instruction according to the difference value and the adjusting dead zone, an active control locking condition, and the judgment result of the active instruction andan active power output range. The device comprises an instruction judging module, an instruction checking module and an instruction assigning module. According to the technical scheme, the photovoltaic inverter can work preferentially in the maximum efficiency interval in the active power control process, so that the inverter keeps higher power conversion rate, and the output efficiency of the whole power of the photovoltaic power station is improved.

Description

technical field [0001] The invention relates to the field of photovoltaic power station control, in particular to a photovoltaic power station active power control method and device. Background technique [0002] The power system relies on the balance between the sum of the active power generated by all parallel operating units in the system and the sum of the active power consumed by all loads to maintain the stability of the system frequency. Since the total load of the power system fluctuates from time to time, it is necessary to adjust the active power of the parallel operating units in time to ensure the stability of the power system. frequency operating range. With the large-scale development of photovoltaic power plants, domestic and foreign grid-connected standards have put forward requirements for the power control of photovoltaic power plants. May be consistent with conventional power supply functions. [0003] At present, research on control methods related to t...

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Problems solved by technology

[0005] Although the above prior art considers the adjustment margin of the photovoltaic power generation unit or the inverter, and formulates corresponding control strategies according to the active power increase and decrease margin, the efficiency of the photovoltaic inverter, which is the most important parameter for inverter work did not consider

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