CN-121662578-B - Magnetic phase-shifting transformer structure based on vector magnetic circuit theory and application method thereof

CN121662578BCN 121662578 BCN121662578 BCN 121662578BCN-121662578-B

Abstract

The invention provides a magnetic phase-shifting transformer structure based on vector magnetic circuit theory and an application method thereof, wherein the magnetic phase-shifting transformer consists of a target transformer magnetic circuit and a magnetic induction element matrix, and realizes equivalent magnetic resistance to the magnetic circuit of the magnetic phase-shifting transformer Equivalent magnetic reactance of magnetic circuit of magnetic shift phase-change transformer Thereby continuously regulating the magnetic flux phase angle of the magnetic phase-shifting transformer Simultaneously, the equivalent magnetic resistance of the magnetic circuit of the magnetic shift phase transformer is regulated Equivalent magnetic reactance of magnetic circuit of magnetic shift phase-change transformer Parameters for realizing cut-off frequency of magnetic circuit Thereby filtering the harmonic wave in the magnetic circuit and applying active power to the magnetic circuit And reactive power The method comprises the steps of carrying out controllable distribution, carrying out wide-range adjustment on the magnetic flux phase in an iron core directly by carrying out dynamic control on the parameter configuration, combination mode and switching state of the magnetic induction element, thereby realizing the phase shift of the secondary winding voltage of the transformer relative to the primary voltage and realizing the harmonic screening and reactive compensation of a magnetic circuit.

Inventors

CHENG MING
QIN WEI
LUO ZHEJUN
WEI XINCHI
WANG WEI
ZOU ZHIXIANG
ZHU XINKAI
HUA WEI

Assignees

东南大学
华北电力大学（保定）

Dates

Publication Date: 20260508
Application Date: 20260205

Claims (7)

1. A magnetic shift phase-change transformer based on vector magnetic circuit theory is characterized by comprising a target transformer magnetic circuit and a magnetic induction element matrix, wherein the equivalent magnetic resistance of the magnetic shift phase-change transformer magnetic circuit is realized by controlling the parameter configuration, combination mode and switching state of the magnetic induction element in the magnetic induction element matrix Equivalent magnetic reactance of magnetic circuit of magnetic shift phase-change transformer Thereby continuously regulating the magnetic flux phase angle of the magnetic phase-shifting transformer Simultaneously, the equivalent magnetic resistance of the magnetic circuit of the magnetic shift phase transformer is regulated Equivalent magnetic reactance of magnetic circuit of magnetic shift phase-change transformer Parameters for realizing cut-off frequency of magnetic circuit Thereby filtering the harmonic wave in the magnetic circuit and applying active power to the magnetic circuit And reactive power The primary side of the system forms an independent system, the secondary side is a system coupled with the primary side through a magnetic circuit of a magnetic shift phase transformer, and the secondary side is an independent active power system or a passive user load; The magnetic flux phase angle of the magnetic shift phase transformer Equivalent reluctance of the magnetic circuit Equivalent magnetic reactance of magnetic circuit of phase-shifting transformer Determining that the formula is satisfied If the magnetic flux phase angle of the magnetic phase shifting transformer needs to be adjusted to a new target phase angle Then the equivalent magnetic resistance of the magnetic induction element matrix needs to be adjusted Equivalent magnetic reactance to a matrix of magnetically sensitive elements Make it meet In which, in the process, Representing the equivalent reluctance of the magnetic circuit of the target transformer, Representing the equivalent magnetic reactance of the magnetic circuit of the target transformer; Equivalent reluctance of the magnetic circuit of the magnetic shift phase-change transformer Equivalent reluctance by target transformer magnetic circuit Equivalent reluctance with a matrix of magnetically sensitive elements Determination, i.e. The equivalent magnetic reactance of the magnetic circuit of the magnetic shift phase transformer Equivalent magnetic reactance of magnetic circuit of target transformer Equivalent magnetic reactance to a matrix of magnetically sensitive elements Determination, i.e. ; The magnetic induction element matrix is composed of a plurality of magnetic induction elements, each magnetic induction element is composed of a magnetic induction closing coil, a capacitor and other circuit elements, and comprises a circuit element type and a vector magnetic circuit element type, and the four-way adjustment of the equivalent magnetic circuit parameters of the magnetic induction element matrix, namely the forward equivalent magnetic resistance change, is realized by dynamically controlling the parameter configuration, the combination mode and the switching state of the magnetic induction elements Negative equivalent reluctance change Forward equivalent magnetic reactance change Negative equivalent magnetostriction change 。
2. The vector magnetic circuit theory-based magnetic shift phase transformer according to claim 1, wherein the active power of the magnetic circuit of the magnetic shift phase transformer And reactive power Equivalent magnetic resistance of magnetic circuit of magnetic shift phase-change transformer Equivalent magnetic reactance of magnetic circuit of phase-shifting transformer Determining, wherein the active power satisfies a condition Reactive power satisfies the condition , Is the magnetic flux effective value of the target magnetic circuit, The dynamic regulation and control of the magnetic circuit power are realized by adjusting the equivalent magnetic circuit parameters of the magnetic phase-shifting transformer, so that the active power and the reactive power of the magnetic circuit are distributed according to the expected direction and the expected size, and the active power regulation and the reactive power compensation of the power transmission line are realized.
3. The vector magnetic circuit theory-based magnetic shift phase transformer according to claim 2, wherein the magnetic shift phase transformer has a magnetic circuit cut-off frequency of Equivalent reluctance of magnetic circuit of phase-change transformer by magnetic displacement Equivalent magnetic reactance of magnetic circuit of magnetic shift phase-change transformer When the equivalent magnetic circuit parameter of the magnetic phase-shifting transformer changes, the cut-off frequency is dynamically adjusted accordingly, so that the partial filtration of harmonic waves in the magnetic circuit can be realized.
4. The device of claim 3, wherein the target transformer magnetic circuit has a plurality of topologies including single magnetic circuit, double magnetic circuit, multiple magnetic circuits or rotating magnetic circuit, by adjusting the equivalent reluctance of the magnetic induction element matrix Equivalent magnetic reactance to a matrix of magnetically sensitive elements Realize the phase angle of the magnetic flux of the target magnetic circuit Is controlled by the control program.
5. The magnetic shift phase transformer based on the vector magnetic circuit theory, as claimed in claim 4, is suitable for both single-phase transformer magnetic circuits and three-phase transformer magnetic circuits, wherein for the three-phase transformer magnetic circuits, different adjustment modes are selected according to specific application requirements, firstly, a magnetic induction element matrix is respectively introduced on each phase of magnetic circuit to realize independent adjustment and control of magnetic flux phases of each phase, and secondly, the magnetic induction element matrix is used for carrying out integral phase adjustment on three-phase composite magnetic fluxes.
6. The vector magnetic circuit theory-based magnetic shift phase transformer of claim 5, wherein when the magnetic shift phase transformer is connected to two application systems, bidirectional power flow regulation between the two systems can be realized, and active power of a line between the two systems Satisfy the formula Reactive power of line between two systems Satisfy the formula In which, in the process, And The voltage amplitude and phase of the system 1 respectively, And The voltage amplitude and phase of the system 2 respectively, Reactance of transmission line by adjusting magnetic phase-shifting transformer The phase difference of the power of the circuit is controlled by the direction and the magnitude of the power of the circuit When the line power flows forward, when When the line power flows negatively And no power is transmitted between the two systems, so that bidirectional regulation and control of power flow in the power transmission line are realized.
7. An application method of a magnetic shift phase-change transformer according to any one of claims 1 to 6, characterized in that for a target transformer magnetic circuit, the parameter configuration, combination mode and switching state of a magnetic induction element matrix are adjusted to realize the phase angle of the magnetic flux of the magnetic shift phase-change transformer Is precisely regulated to reach a preset target phase angle The method comprises the following specific steps: S1, calculating equivalent magnetic circuit parameters without adding a magnetic induction element matrix according to the physical structure, frequency and temperature actual working conditions of a target transformer magnetic circuit, wherein the equivalent magnetic circuit parameters comprise equivalent magnetic resistance of a magnetic phase-shifting transformer magnetic circuit Equivalent magnetic reactance of magnetic circuit of magnetic shift phase-change transformer ; S2, according to a preset target phase angle And tangent curve thereof, constructing magnetic flux phase angle Equivalent reluctance with magnetic circuit of magnetic shift phase-change transformer Equivalent magnetic reactance of magnetic circuit of magnetic shift phase-change transformer Functional relation between the two to determine that the target phase angle is satisfied Required to be at the same time The adjusting direction and adjusting range of the magnetic induction element matrix to the magnetic circuit parameter of the target transformer are defined by combining the equivalent magnetic circuit parameters obtained in the step S1; S3, determining a specific construction form of a magnetic induction element matrix according to a magnetic circuit structure and application requirements of the target transformer, wherein the specific construction form comprises a circuit element type or a vector magnetic circuit element type, and determining parameter configuration, combination modes and corresponding switching states of the magnetic induction elements under the constraint of the magnetic circuit parameter adjustment direction of the target transformer in the step S2; s4, connecting the magnetic induction element matrix configured in the step S3 into a magnetic circuit of a target transformer, and constructing the magnetic shift phase transformer; S5, on the premise that the safe and stable operation of the magnetic phase-shifting transformer and the power transmission line is not affected, the parameter configuration and switching state of the magnetic induction element matrix are dynamically adjusted according to the real-time phase-shifting and power flow adjusting requirements of the power transmission line, so that effective suppression of magnetic circuit harmonic waves, flexible regulation and control of active power and dynamic compensation of reactive power are achieved, fine control of power flow of the power transmission line is achieved, and the overall operation performance of the power transmission system is improved.

Description

Magnetic phase-shifting transformer structure based on vector magnetic circuit theory and application method thereof Technical Field The invention belongs to the field of application of magnetic circuit theory, and particularly relates to a structural design of an electromagnetic device. Background The phase-shifting transformer is a device capable of changing the phases of input and output voltages, and has wide application requirements in aspects such as power flow control of a power transmission system. When the voltage in the power transmission line passes through the phase-shifting transformer, the amplitude and the phase angle of the voltage can be continuously or stepwise regulated within a certain range, so that the phase difference between the voltages at two ends of the line is effectively changed, and the flexible regulation and control of the line power flow are realized. Compared with other tide control devices, the phase-shifting transformer has the advantages of strong regulation capability, mature structure, high operation reliability, relatively low investment cost and the like, and is widely applied to the scenes of power grid tide distribution optimization, trans-regional interconnection line power control and the like. The phase-shifting transformer applied in the existing phase shifter engineering mainly comprises a single-core phase-shifting transformer, a double-core phase-shifting transformer, a rotary phase-shifting transformer and other structural forms. Although the specific structures of the power transmission lines are different, the basic working principle is basically consistent, namely, an additional voltage phasor with controllable amplitude and phase angle is introduced by means of a tap structure, an on-load tap changer, an additional voltage regulating winding and the like on the basis of the voltage at the input side of the original power transmission lines and is overlapped with the original voltage phasor, so that a new output voltage phasor is obtained through synthesis, and the voltage phase difference at two ends of the lines is expected to change. However, the above-mentioned phase-shifting transformer solution essentially still belongs to an electrical structure implementation manner based on voltage phasor superposition, and still has a certain technical limitation. In addition, the analysis and design of the existing phase-shifting transformer are generally based on a traditional equivalent circuit or scalar magnetic circuit model, so that the phase relation between magnetomotive force and magnetic flux is difficult to accurately describe, and the further improvement of the performance of the phase-shifting device and the innovative design of a novel structure are limited to a certain extent. Therefore, a new theory and design method for representing the phase characteristics of the magnetic circuit from the magnetic circuit mechanism are needed, and a new technical path is provided for analysis, design and optimization of the phase-shifting transformer and related phase-shifting power devices. The prior Chinese patent CN202011350276.4 and CN202311372958.9 show that based on the vector magnetic circuit theory, the magnetic circuit of the electromagnetic equipment can be characterized by three basic magnetic circuit parameters of magnetic resistance, magnetic induction and magnetic capacity, and the phase relation in the magnetic circuit is jointly determined by the basic magnetic circuit parameters. However, the Chinese patent CN202011350276.4, CN202311372958.9 and CN202311364997.4 mainly provide a method for forming vector magnetic circuit elements and a use rule thereof, and the key problems of how to quantitatively calculate and reasonably configure the number of vector magnetic circuit elements, electromagnetic parameters and structural forms according to actual phase-shifting requirements under the condition of given transmission line voltage amplitude and target phase-shifting angle, and how to realize effective realization and accurate regulation of phase-shifting functions by selecting and switching different vector magnetic circuit elements from the angle of vector magnetic circuit theory are not solved. The above problems have yet to be further studied. Disclosure of Invention Aiming at the defects of small phase shifting range, large tapping capacity, complex structure, single function (only phase shifting function, no filtering and reactive compensation function) and the like of the traditional phase shifting transformer, the technical problem is to provide a magnetic phase shifting transformer construction method based on vector magnetic circuit theory, which realizes the phase shifting of voltage from the magnetic circuit rather than the circuit layer. The magnetic shift phase transformer constructs a magnetic induction element matrix in a magnetic circuit of a target transformer based on a vector magnetic circuit principle, and the magnetic flux p