Construction method of load shedding optimization model considering primary and secondary frequency regulation and minimum frequency deviation

Abstract

The invention discloses a load shedding optimization model taking into consideration primary and second frequency modulation and minimum frequency deviation. Frequency deviation is added to an objective function of the optimization model, and the minimum weighted sum of the load active power reduction and the square of frequency deviation is taken as the objective function. A primary frequency modulation equation of a wind turbine unit and a secondary frequency modulation equation of an AGC unit are added to the equality constraints of the optimization model. The equality constraints of the optimization model include a frequency quality constraint, a node voltage amplitude constraint, unit active power and reactive power constraints, an AGC unit ramp constraint, a branch power constraint and a load node active power reduction constraint.

Description

technical field [0001] The invention belongs to the field of power generation and transmission systems, and aims to realize the calculation of the load reduction amount of the power generation and transmission system, and specifically relates to a load reduction optimization model considering primary and secondary frequency modulation and minimum frequency deviation. Background technique [0002] In recent years, the continuous expansion of wind power application scale and the rapid growth of power load demand have put forward higher requirements for the safe and reliable operation of power generation and transmission systems. The operational reliability level of the power generation and transmission system is directly affected by the real-time operating conditions such as the system frequency. If the frequency is too small or too large, it is not conducive to the safe, reliable and economical operation of the system, and will lead to system collapse in severe cases. Primary...

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Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies of the existing generation and transmission system load reduction optimization model, and propose a load reduction optimization model that considers primary and secondary frequency modulation and minimum frequency deviation: add frequency deviation in the objective function of the optimization model, and take the load The minimum weighted sum of the active power reduction and the square of the frequency deviation is used as the objective function; the primary frequency regulation equation of the wind turbine unit and the secondary frequency regulation equation of the AGC unit are added to the equality constraint of the optimization model; the frequency is considered in the inequality constraint of the optimization model Quality constraints, node voltage amplitude constraints, unit active and reactive power constraints, AGC unit climbing constraints, branch power constraints and load node active power reduction constraints

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