Photovoltaic primary frequency modulation power control method and device considering light intensity and operation characteristics

Abstract

The invention provides a photovoltaic primary frequency modulation power control method considering light intensity and operation characteristics. According to the method, light intensity and photovoltaic operation characteristics are considered on the basis that photovoltaic power generation participates in primary frequency modulation of a system, additional power control is set for different stations before secondary frequency modulation actions of a synchronous unit of the system, and power output curves of the stations are determined by combining photovoltaic primary frequency modulation droop characteristics and sent to the stations for control. And after the system synchronizes the secondary frequency modulation action of the unit, the additional power control is quitted, and frequency modulation is completed. According to the invention, power control is added on the basis of photovoltaic participation in primary frequency modulation, so that the condition that the frequency deviation is over-limited in the first swing period in the primary frequency modulation process is effectively improved, and the dynamic stability of the system is improved; light intensity and photovoltaic operation characteristics are considered in additional power control, and output of each photovoltaic station in a primary frequency modulation process is reasonably distributed, so that each photovoltaic station gives full play to power generation and frequency modulation capabilities, and the control precision is improved.

Description

Technical field [0001] The present application relates to the field of photovoltaic power generation, and in particular to a photovoltaic primitive frequency control method for consideration of light intensity and operating characteristics. Background technique [0002] The photovoltaic power generation is rich in reserves, high cost, and the advantages of clean and environmental protection have been rapidly developed in recent years. The grid capacity is increasing. However, the photovoltaic power generation system is a still element, lacks the moment of inertia, and is generally in the maximum power tracking mode, and does not participate in the system faster. With the access to large-scale photovoltaic power, the proportion of conventional power generator in the power system is reduced, and the power system inertia is reduced to a certain extent, and the frequency modulation capability of the power system and the ability to deal with the power shortage and frequency fluctuatio...

AI Technical Summary

Problems solved by technology

However, since the maximum output power of each photovoltaic cell is greatly affected by the lighting conditions, and is affected by the differences in the power generation characteristics of photovoltaic panels, their location and inverter characteristics, the power generation capacity of each photovoltaic site varies.

The conventional average distribution strategy, that is, the distribution of the control target value according to the proportion of the installed capacity of the photovoltaic field station, does not take into account the operating characteristics of the photovoltaic itself and the adjustment margin and speed, and cannot fully utilize the potential of photovoltaics with different power generation capabilities to participate in frequency regulation

In addition, in the process of PV participating in the primary frequency regulation, if the primary frequency regulation capability of the system is insufficient, the frequency deviation cannot be limited within the allowable range, which seriously endangers the normal operation of the power system.

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