Robust Interval Wind Power Scheduling Method Based on Improved Frequency Response Characteristics of Generators

Abstract

The invention discloses a power generator improvement frequency response characteristic-based robust zone wind power dispatching method. The method comprises the following steps of building an expression of a primary frequency response model having proportion and differential controller feedback; simplifying the expression according to Routh stability criterion; expanding the simplified expressionto a multi-power generator system, and obtaining a standard form of the primary frequency response characteristic of the power system; converting the standard form to time domain, deriving differencebetween a rotor rotational speed of the power generator and a synchronous rotational speed, and acquiring maximum frequency deviation of the multi-power generator system under the condition of disturbance; determining an optimization target and a constraint condition of a robust zone wind power dispatching model according to the improved frequency response characteristic of the power generator; and performing robust zone wind power dispatching on the power system according to the optimization target and the constraint condition. When wind power output abruptly fluctuates, the system frequencyfluctuation range can be enabled to be within a system safety limit all the way, and more wind power can be absorbed.

Description

technical field [0001] The invention belongs to the technical field of power system operation and control, in particular to a robust interval wind power scheduling method based on improved frequency response characteristics of generators. Background technique [0002] Wind energy is inexhaustible, inexhaustible, and clean and pollution-free, making wind power one of the most promising forms of renewable energy utilization in the future. In the past two decades, the global wind power industry has achieved extraordinary development. China's new wind power installed capacity in 2017 was 19,660MW, accounting for 37.45% of the world's new wind power installed capacity, ranking first in the world. [0003] Although wind power generation has many advantages, it also has disadvantages such as randomness, large intermittency, and difficulty in accurate prediction. The integration of large-scale wind power into the grid has brought great challenges to the active power balance and fr...

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Problems solved by technology

Although a few literatures have considered the frequency stability problem in the dispatching process, the simulation results show that using the traditional primary frequency response model of the power system sometimes leads to a large number of wind curtailment problems, which makes these methods difficult to put into practical application

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