Automatic low-frequency low-voltage load-reducing centralization optimization control system

Abstract

The invention relates to an automatic low-frequency low-voltage load-reduction centralized optimization control system for power systems in the technical field of industrial control. The control system comprises a data acquisition module, an off-line computation module and an on-line control module, wherein the data acquisition module acquires EMS data through a data server, and acquires the operation information of a system through data acquisition devices arranged on a PMU, a UFLS device and an important element, as well as the operation condition of every element; the off-line computation module computes voltage stability boundary of nodes, as well as load frequency response functions; and the on-line control module computes load shedding amount, determines the order of UFLS movements, transmits control instructions to the UFLS device, and determines a next control instruction according to the information fed back by the UFLS. The control system is based on the parameters of the real-time changes of the power systems, and determines the movement order and load shedding amount of the UFLS device of a whole network, thereby speeding up the frequency recovery of the systems and improving the operation stability of the systems.

Description

technical field [0001] The invention relates to a power system optimization control system in the technical field of industrial control, in particular to an automatic low-frequency and low-voltage load reduction centralized optimization control system. Background technique [0002] When there is a lack of active power in the power system, the system frequency will drop due to the imbalance between supply and demand. If the backup cannot restore the system frequency quickly, the system may collapse. The frequency automatic load shedding device is the third line of defense for the safe operation of the power grid. Its main function is to cut off a part of the load quickly according to the predetermined control strategy before the system frequency collapses when a serious abnormal accident occurs and a serious active power shortage occurs. , in order to "sacrifice local security overall" to ensure the safe operation of the system and uninterrupted power supply to important user...

AI Technical Summary

Problems solved by technology

The time for frequency recovery is increased, which is not conducive to the rapid recovery of frequency

[0008] 3. The action parameter is single, and only the frequency f is considered. According to the actual operating experience, when the frequency deviation is the same, when the frequency change rate, node voltage value, and online load characteristics are different, the dynamic frequency of the system will also be very different. In some cases, the df / dt (du / dt) action parameters are increased, and the adaptability of the UFLS device is still very low

The actual operation data shows that when the system has a serious active power shortage, especially the island system, its df / dt may even be greater than 10. , UFLS does not act, and in severe cases, it may cause the system to crash and disconnect

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