Multi-time-scale mathematical model establishing method of distributed power flow controller

Abstract

The invention relates to a multi-time-scale mathematical model establishing method of a distributed power flow controller. The method comprises: S1, a parallel-side apparatus of a distributed power flow controller is used as one converter groups including a parallel grid-side three-phase converter equivalent circuit, a parallel harmonic-side single-phase converter equivalent circuit, and a parallel-side common direct-current capacitor equivalent circuit in back-to-back connection; S2, a series-side apparatus of the distributed power flow controller is used as one applied to an alternating-current fundamental wave network equivalent circuit, an alternating-current third harmonic network equivalent circuit, and a series-side direct-current capacitor equivalent circuit simultaneously; S3, according to the principle of a voltage type PWM converter switch cycle average model, a dynamic mathematical model of the distributed power flow controller is established; and S4, a multi-time-scale analysis is carried out on the dynamic mathematical model of the distributed power flow controller by combining a singular perturbation principle and a multi-time-scale mathematical model of the distributed power flow controller is established. Therefore, the multi-time-scale characteristic of the whole power system can be analyzed well. The method is suitable for the order reduction analysis of the power system.

Description

technical field [0001] The invention relates to the technical field of flexible alternating current transmission, in particular to a method for establishing a multi-time scale mathematical model of a distributed power flow controller. Background technique [0002] In the next period of time, my country's energy consumption will enter a normal process of low-to-medium growth, and the level of power supply and demand will be further relaxed. Reasonably planning the supply and demand, and meeting the power supply in a more economical and efficient manner have become issues that need to be studied in depth. Flexible AC transmission technology (FACTS, Flexible AC Transmission System) uses power electronic conversion components and their control devices to control power transmission capabilities, and realizes power transmission in the form of a combination of device control and system central commands without changing the line topology. Real-time control of system operating indic...

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Problems solved by technology

[0004] At present, the research on the mathematical model of the distributed power flow controller is mainly focused on the modeling of the equivalent power source method, and the whole system is equivalent to a fundamental wave network model and a third harmonic network model, because the switch state inside the power electronic device is ignored , is not conducive to analyzing the internal characteristics of the device

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