Control method for power type capacitor cooperating with PMSG fan to participate in primary frequency modulation

Abstract

A control method for a power type capacitor cooperating with a PMSG fan to participate in primary frequency modulation adopts a super capacitor to upgrade a PMSG fan grid-connected converter, provides a control strategy for energy storage and the PMSG fan to participate in primary frequency modulation of a power grid cooperatively, and solves the problem of weak primary frequency modulation capability of the PMSG fan at present. According to the method, the structure and control of a back-to-back converter of the PMSG fan do not need to be changed, reserve capacity for frequency modulation does not need to be reserved, a wind storage cooperative control mode is adopted, the frequency modulation capacity of the fan can be utilized to the maximum extent, capacity configuration of a super capacitor is reduced as much as possible, and the economical efficiency of the PMSG fan participating in power grid frequency modulation in the whole life cycle is improved.

Description

technical field [0001] The invention belongs to the technical field of new energy power generation, and in particular relates to a control method in which a power type capacitor cooperates with a PMSG fan to participate in primary frequency modulation. Background technique [0002] Wind turbines generally operate in MPPT mode, so the frequency regulation capability of wind turbines is mainly limited by the upward power regulation capability, and they cannot participate in the primary frequency regulation of the power grid under all working conditions. In addition, the latest "Guidelines for the Safety and Stability of Power Systems GB 38755-2019" requires new energy to be grid-friendly and to participate in primary frequency regulation of the power grid just like traditional thermal power and hydropower. Therefore, many scholars have conducted research on PMSG wind turbines participating in the primary frequency regulation of the power grid, as follows: [0003] Li Junhui, ...

AI Technical Summary

Problems solved by technology

However, the method of sharing the DC bus may cause the current exceeding the original design peak value to flow on the DC bus, and at the same time, the current of the switching device of the wind turbine converter may exceed the maximum peak current it can withstand, causing irreversible damage to the wind turbine converter. damage

Therefore, this method of sharing the DC bus requires the close cooperation of the wind turbine manufacturer, starting from the selection of components to carry out in-depth transformation of the wind turbine converter, which is obviously difficult to operate in engineering practice

[0005] It can be seen from the above existing technologies that the existing energy storage and wind turbines participating in the primary frequency regulation of the power grid are mainly divided into two types: one is to use centralized energy-type energy storage, starting from the frequency regulation capability of the energy storage itself , but did not dig deep into the frequency modulation capability of the wind turbine itself; the other is to use distributed power energy storage, but because of the way of sharing the DC bus, although the cost of the energy storage converter can be saved, it needs to be used from The selection of components began to carry out in-depth transformation of wind turbine converters, which is obviously difficult for engineering applications

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