A distributed power flow controller and a control method therefor are disclosed. The controller is mounted on a power transmission line, wherein the distributed power flow controller comprises shunt-wound side equipment and series-wound side equipment; each phase of power transmission line is split into multiple split conductors; the series-wound side equipment comprises multiple groups of single-phase power flow compensators connected with each phase of power transmission line in series separately; each group of certain-phase power flow compensators shares a set of converter, controller, current transformer, voltage transformer and communication module; each group of certain-phase power flow compensators also comprises multiple single-turn transformers matched with the number of the split conductors; and the alternating current side of the corresponding converter is connected to each split conductor through each single-turn transformer separately. The control method is carried out by the steps of comparing the each-phase transmission power target value with an actually collected and calculated transmission power parameter difference value; trigging control on the converter; optimizing and switching switch sequences of the converter; and realizing transmission power compensation for the power transmission line. According to the distributed power flow controller and the control method therefor, the transmission power of the power transmission system with multiple split conductors is realized; due to the control method, balanced power flow distribution is achieved; and the flexibility and reliability of equipment control are improved.

Distributed power flow controller and control method therefor

The invention discloses an automatic direct-current magnetic bias compensation device of a metering winding of a current transformer. The automatic direct-current magnetic bias compensation device is characterized in that a metering iron core of the current transformer is provided with the metering winding and a compensation winding which are independent of each other, and the compensation winding is connected with the automatic direct-current magnetic bias compensation device. The automatic direct-current magnetic bias compensation device is used for detecting the size and phase position of an even harmonic component in an output signal of the secondary-side metering winding of the current transformer, and therefore a direct-current source is controlled to inject reverse direct current of the corresponding amount to the secondary-side compensation winding of the current transformer as compensation current, the compensation current generates a magnetic field in the compensation winding, a magnetic field generated by the primary-side direct current is offset, and then automatic and on-line compensation for the direct-current magnetic bias of the current transformer is achieved. The automatic direct-current magnetic bias compensation device is remarkable in effect of automatically compensating for the direct-current magnetic bias of the current transformer.

Automatic direct-current magnetic bias compensation device of measurement winding of current transformer

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

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

The invention provides a distributed series-coupled type power flow controller comprising a control cabin, a coupling transformer cabin, a power-taking current transformer, an IGBT assembly, a control box and a coupling transformer, wherein the control cabin and the coupling transformer cabin are of an integral ladder structure, and the integral ladder structure consists of an upper shell and a lower shell and can be opened and closed; the power-taking current transformer, the IGBT assembly and the control box are arranged in the control cabin, and the coupling transformer is arranged in the coupling transformer cabin; and the control cabin and the coupling transformer cabin are made of an aluminum alloy material. According to the distributed series-coupled type power flow controller provided by the invention, insert of electrical reactance or capacitive reactance can be performed by virtue of a transformer coupling mode, a primary side winding of the coupling transformer is a single-turn power transmission line, and the coupling transformer is provided with a plurality of turns of secondary windings; the distributed series-coupled type power flow controller can perform rapid control by virtue of a solid-state combination switch, does not need to disconnect the power transmission line and change an original line structure, does not have space occupation requirements, achieves local control, is simple and flexible, is easy to assemble, can be repeatedly used in different lines, and can be used for greatly reducing the construction cost and running cost compared with a centralized FACTS device.

Distributed series-coupled type power flow controller

The invention discloses a DC power supply power flow controller topology, which is composed of a first guide switch module (11), a second guide switch module (12) and a full-bridge sub module (13), wherein the first leading-out terminal of the first guide switch module (11) is connected with the first leading-out terminal of the second guide switch module (12) to serve as a first leading-out terminal (1) of the DC power supply power flow controller; the second leading-out terminal of the first guide switch module (11) is connected with the first leading-out terminal (4) of the full-bridge sub module (13), and the connection point serves as a second leading-out terminal (2) of the DC power supply power flow controller; and the second leading-out terminal of the second guide switch module (12) is connected with the second leading-out terminal (5) of the full-bridge sub module (13) to serve as a third leading-out terminal (3) of the DC power supply power flow controller.

DC power supply power flow controller topology

The invention relates to a distributed power flow controller based on line cubic harmonic waves, comprising a power transmission line, wherein a first Y-delta type transformer and a second Y-delta type transformer are installed on two ends of the power transmission line; a power flow controller unit is installed on the power transmission line; the distributed power flow controller also comprises a cubic harmonic power supply, wherein the cubic harmonic power supply is connected with a neutral point of the Y-type winding of the first Y-delta type transformer; the neutral point of the Y-type winding of the second Y-delta type transformer is grounded; the power flow controller unit comprises a converter, wherein a positive pole of the converter direct-current side is connected with one end of a capacitor; the negative pole of the converter direct-current side is connected with the other end of the capacitor; the converter is connected with the power transmission line in series by a single-turn coupling transformer; the converter is connected with an output end of the controller; an input end of the controller is connected with a current mutual inductor and a voltage mutual inductor on the power transmission line The invention can improve reliability of the power transmission line

Distributed power flow controller based on line cubic harmonic wave

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Distributed power flow controller based on line cubic harmonic wave