Method for realizing emergency control on frequency and voltage of electric system

Abstract

The invention relates to a method for realizing the emergency control on the frequency and the voltage of an electric system. On the basis of a bus voltage V, a frequency f, a generator or a load current I of an installing place of a frequency and voltage emergency controller, the emergency state, the measuring loop abnormal state and the load feedback state of the frequency and the voltage of the electric system can be automatically recognized, and the execution of the emergency control action can be correspondingly unlocked or locked. The method introduces the current amount measurement in a traditional controller, and a key problem that the device measuring abnormity and the electric network emergency state can not be correctly distinguished only through the variation rate of the frequency or the voltage can be solved.

Description

technical field [0001] The invention relates to an automatic control method of a power system, in particular to a method for realizing emergency control of the frequency and voltage of the power system. Background technique [0002] The frequency and voltage emergency control of the power system is an important technical means to prevent the stability of the power grid from being damaged and large-scale power outages. [0003] In order to ensure that after a sudden active power shortage occurs, the reserved operating load capacity can be adapted to the operating generating capacity at any time, and the system frequency can be quickly restored to the rated value, and an automatic load shedding device for frequency reduction must be configured. Similarly, the experiment of installing the automatic load shedding device according to the voltage reduction lacks the necessary safety automatic device in the reactive area. [0004] In addition, in order to reduce the mutual influen...

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Problems solved by technology

[0006] The analysis shows that when a serious fault occurs in the power system and the active power or reactive power is seriously unbalanced, the absolute value of df / dt or dV / dt may be very large, which will cause the frequency and voltage emergency control device designed according to the traditional method to refuse to operate

In other words, the absolute value of df / dt or dV / dt alone cannot distinguish whether an emergency situation has occurred in the power grid and emergency control should be implemented, or an abnormal situation such as the actual effect of the measurement circuit has occurred and the control should be blocked

[0007] Therefore, the traditional frequency voltage emergency control design method has the danger of causing serious consequences due to refusal to take control measures when the emergency state of the power grid urgently needs to be taken.

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