Coordinated control method and system for frequency of isolated microgrid based on temperature-controlled load

Abstract

The invention discloses a method and system for coordination control of isolated microgrid frequency based on a temperature control load, while ensuring the comfort level of users, uses a synergistic effect of an improved variable participation degree frequency modulation method for the temperature control load and an energy storage device frequency modulation method to realize secondary adjustment of microgrid system frequency, can give full play to a frequency modulation capability of the temperature control load, and can effectively lower a requirement for the capacity of the energy storage device, thereby well improving a microgrid frequency control effect. The method includes the steps of: S1. performing frequency modulation on a microgrid based on an improved user participation degree coefficient K<AC>, K<AC>=on%P<N> / (T<+>-T<->)*k<f>, wherein k<f> is an original user participation degree coefficient, on% is the proportion of the temperature control load in an on state under a stable running state, P<N> is rated power of the temperature control load, and T<+> and T<-> are set temperature limits for switching-on and switching-off of the temperature control load; and S2. performing frequency modulation on the microgrid again based on the energy storage device.

Description

technical field [0001] The invention relates to the field of energy management of a single-area micro-grid system, in particular to a method and system for coordinated control of the frequency of an isolated micro-grid based on temperature-controlled loads. Background technique [0002] With the development of the national economy, the high penetration rate of solar energy, wind energy and other variable energy sources and the continuous growth of power load demand, when the micro-grid operates in isolation, it brings great challenges to the maintenance of the balance between power supply and demand in my country, and it is difficult to ensure the grid frequency. stability. Under the operation mechanism of the traditional power grid, if there is insufficient power generation of new energy sources such as solar energy and peak loads of users, peak generating units may be activated, or load management measures such as power rationing shall be adopted for power users to maintain...

AI Technical Summary

Problems solved by technology

Although this method can enhance the adjustment effect of the system frequency and reduce the capacity demand of the energy storage device while ensuring the comfort of the user, it fails to give full play to the frequency adjustment effect of the user-side load, and the one-time adjustment of the system frequency It is a differential adjustment, and this method does not further optimize the error in the frequency adjustment effect itself.

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