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Control method of variable frequency transformer fault ride-through circuit, and related circuit

A transformer failure and control method technology, applied to a single AC network with different frequencies, circuit devices, AC network circuits, etc., can solve problems such as noise pollution, variable frequency transformer torque fluctuations, and limited effect of short-circuit current limitation

Active Publication Date: 2018-04-17
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although various series combinations of multiple resistors can be used to deal with different degrees of voltage drop faults, the limited combination of resistors cannot fully compensate the voltage at both ends of the variable frequency transformer, and the limiting effect on short-circuit current is limited. Low, and a large amount of power loss is on the series dynamic braking resistor, causing unnecessary power loss
In addition, when a voltage asymmetry drop occurs on one side of the power grid, it will also cause torque fluctuations in the variable frequency transformer, shorten the life of mechanical components, and generate huge noise pollution

Method used

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  • Control method of variable frequency transformer fault ride-through circuit, and related circuit
  • Control method of variable frequency transformer fault ride-through circuit, and related circuit
  • Control method of variable frequency transformer fault ride-through circuit, and related circuit

Examples

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no. 1 example

[0108] Please refer to Figure 4 , Figure 4 It is a schematic structural diagram of a variable frequency transformer fault ride-through circuit provided by the embodiment of the present application.

[0109] This embodiment provides a variable frequency transformer fault ride-through circuit, which can increase the circuit voltage and reduce the short-circuit current by compensating reactive power, and prevent the voltage drop from falling to the other side of the power grid. This embodiment may include:

[0110] The first power grid 1, the second power grid 2, the variable frequency transformer 3, the first three-phase rectifier 6, the motor drive converter 4, the first compensation circuit 5 and the control circuit 7;

[0111] The first grid 1 is connected to one end of the input end of the first three-phase rectifier 6 and the output end of the first compensation circuit 5;

[0112] The other end of the output end of the first compensation circuit 5 is connected with the...

no. 2 example

[0135] Please refer to Figure 6 , Figure 6 It is a schematic structural diagram of another variable frequency transformer fault ride-through circuit provided by the embodiment of the present application.

[0136] The first voltage compensation circuit provided by the embodiment of the present application is one-sided compensation, which cannot solve the voltage drop problem on the other side. Therefore, based on the first voltage compensation circuit embodiment, this implementation aims at the voltage drop problem that occurs on both sides. , as a supplementary note, the other parts are substantially the same as the previous embodiment, and the same parts can refer to the previous embodiment, and will not be repeated here.

[0137] Based on the first embodiment, this embodiment may further include a second three-phase rectifier 8 and a second compensation circuit 9;

[0138] The second grid 2 is connected to one end of the input end of the second three-phase rectifier 8 an...

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Abstract

The invention discloses a control method of variable frequency transformer fault ride-through circuit, and the related circuit. The control method of variable frequency transformer fault ride-throughcircuit includes the steps: preprocessing the acquired power grid voltage, the stator interface voltage and the rotor interface voltage to obtain the stator voltage direct current component and the rotor voltage direct current component, and obtaining the first power grid voltage frequency and the second power grid voltage frequency through detection and processing by means of a digital phase-locked loop; performing reference voltage calculation processing on the stator voltage direct current component, the rotor voltage direct current component, the first power grid voltage frequency and thesecond power grid voltage frequency to obtain the voltage reference value of a first PWM transformer and the voltage reference value of a second PWM transformer; and performing control signal acquisition processing on the voltage reference values to obtain switch signals of controlling the first PWM transformer and the second PWM transformer. When the asymmetric fault of the power grid voltage occurs, the control method of variable frequency transformer fault ride-through circuit performs voltage compensation to solve the asymmetric fault of power grid voltage so as to prevent propagating of the asymmetric fault of voltage.

Description

technical field [0001] The present application relates to the technical field of grid asynchronous interconnection, in particular to a control method of a variable frequency transformer fault ride-through circuit and a variable frequency transformer fault ride through circuit. Background technique [0002] With the continuous construction of power grids, power grids in different countries can share power resources. Among them, power grids of different frequencies can be connected to each other through variable frequency transformers. The asynchronous interconnection of the power grid using variable frequency transformers has simple control, strong overload capacity, no commutation failure, and high reliability; no harmonics will be generated during use, and the power quality is better; and it has stronger natural damping and inertial support capability, which is conducive to improving the stability of the power grid. [0003] However, variable frequency transformers cannot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/02H02J3/12H02J3/24
CPCH02J3/02H02J3/12H02J3/002H02J3/241
Inventor 陈思哲卢嘉豪张桂东叶远茂章云张淼
Owner GUANGDONG UNIV OF TECH
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