Power grid frequency modulation method and device

Abstract

The invention provides a power grid frequency modulation method and device. The method comprises steps of determining a photovoltaic power supply active power reference value and a voltage / current outer feature curve of a photovoltaic power supply, determining output power of the photovoltaic power supply, and generating an output P-U curve of the photovoltaic power supply; searching voltage corresponding to the active power reference value of the photovoltaic power supply on the output P-U curve of the photovoltaic power supply and defining the voltage to be a photovoltaic power supply outlet direct current voltage reference value; and fitting the photovoltaic power supply outlet direct current voltage reference value and grid-connected side frequency, and generating a photovoltaic power supply frequency modulation control feature curve. According to the invention, by changing the output power of a photovoltaic plant, the network relating features of the photovoltaic plant are improved; and it is achieved that the photovoltaic power supply participates in the system frequency modulation.

Description

technical field [0001] The invention relates to a control method and device, in particular to a power grid frequency modulation control method and device. Background technique [0002] Solar energy is clean, non-polluting and rich in resources, which can effectively alleviate the pressure on the power industry caused by the energy crisis and environmental crisis. In recent years, the solar photovoltaic industry has developed rapidly, and the installed capacity of power generation has continued to grow. [0003] When the installed capacity of photovoltaic power generation is low, the impact of grid-connected operation on the grid is negligible. Meanwhile, considering the high cost of photovoltaic power generation, it usually operates in a maximum power point tracking (MPPT) mode. Under this control method, the output of photovoltaic power generation is volatile and unpredictable, and cannot provide the auxiliary services required by the power system. Therefore, traditional ...

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Problems solved by technology

Under this control method, the output of photovoltaic power generation is volatile and unpredictable, and cannot provide the auxiliary services required by the power system. Therefore, traditional generators should maintain their capacity to provide sufficient auxiliary services.

As the penetration rate of photovoltaic power generation continues to increase, the resulting economic losses have increased significantly

In addition, the adverse impacts of grid-connected operation on the power grid have gradually become prominent, for example: ①The problem of delivery and consumption caused by the reverse distribution of resources and loads;

These factors seriously restrict the large-scale development of the new energy industry, and even lead to the repeated power cuts of the completed photovoltaic power stations, resulting in a huge waste of resources

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