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A kind of inverter control method

A control method and converter technology, applied in the direction of converting AC power input to DC power output, conversion equipment that can be converted to DC without intermediate conversion, power transmission AC network, etc., can solve the problem of converter transformer network side bushing Problems such as CT saturation out of control, to achieve high economy and avoid out of control

Active Publication Date: 2020-09-08
NR ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

In order to solve this problem, the present invention proposes an economical control method to avoid the out-of-control problem caused by CT saturation of the bushing on the grid side of the converter transformer

Method used

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  • A kind of inverter control method
  • A kind of inverter control method
  • A kind of inverter control method

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Embodiment Construction

[0020] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] attached figure 1 Schematic diagram of measuring point configuration for the flexible DC system. The AC side of the voltage source converter C1 is connected to the bus B1 of the AC system through the converter transformer T1. The grid side of the converter transformer T1 is equipped with an electromagnetic voltage transformer Us and an electromagnetic current transformer Is. The converter transformer T1 The valve side is equipped with electronic voltage transformer Uvc and electronic current transformer Ivc. Generally, the active and reactive power of the grid side of the converter transformer is controlled as the set value, so the measurement values ​​of voltage transformer Us and current transformer Is are mainly used. , but the dynamic range of the control current transformer Is is generally only 2 times,...

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Abstract

The invention discloses a converter control method, which is applied to a voltage source converter. The AC side of the voltage source converter is connected to the AC system through a converter transformer, and the converter is realized by collecting grid side voltage and valve side current. Closed-loop current control of the converter. By adopting the control method provided by the invention, the problem of out-of-control caused by CT saturation of the bushing side of the transformer network is avoided, and new measuring equipment is not needed, thus having high economical efficiency.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a method for controlling a converter. Background technique [0002] Flexible DC transmission uses voltage source converters, which can independently and quickly control active power and reactive power, thereby improving system stability, suppressing system frequency and voltage fluctuations, and improving the steady-state performance of grid-connected AC systems. With the depletion of fossil energy and the increasing pressure to improve the environment, China and the world are facing a strategic adjustment of energy structure, large-scale development and utilization of new energy is imperative. [0003] The AC side of the converter of the flexible DC transmission system is connected to the AC system through the converter transformer. Generally, the active and reactive power of the grid side of the converter transformer is controlled as the set value. When a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02M7/00
CPCH02M5/12H02M7/797H02J3/36H02M1/0003
Inventor 卢宇汪楠楠董云龙田杰李海英姜崇学王佳成丁久东胡兆庆鲁江
Owner NR ELECTRIC CO LTD
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