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Alternating-current excitation system and PWM control method of grid-side converter of alternating-current excitation system

A grid-side converter, AC excitation technology, applied in the direction of converting AC power input to DC power output, AC network to reduce harmonics/ripple, single-grid parallel feeding arrangement, etc., can solve the problem of reducing grid-side harmonics. The problem of wave realization is difficult to achieve the effect of easy realization and implementation, reducing precision requirements and reducing harmonic amplitude.

Pending Publication Date: 2021-03-19
XIAN XJ POWER ELECTRONICS TECH +2
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a PWM control method for an AC excitation system and its grid-side converter, which is used to solve the problem that the existing method of reducing grid-side harmonics is relatively difficult

Method used

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  • Alternating-current excitation system and PWM control method of grid-side converter of alternating-current excitation system
  • Alternating-current excitation system and PWM control method of grid-side converter of alternating-current excitation system
  • Alternating-current excitation system and PWM control method of grid-side converter of alternating-current excitation system

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Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0022] System embodiment:

[0023] The invention provides an AC excitation system, such as figure 1 As shown, it includes machine-side converter 1, grid-side converter 3, excitation transformer group 5 and control module; grid-side converter 3 includes 7 parallel grid-side modules, and the AC side of machine-side converter 1 Used to connect power generation equipment, the DC side of the machine-side converter 1 is connected to the DC side of each grid-side module through an independent DC bus, and a DC Crowbar 2 is set in the independent DC bus; the excitation transformer group 5 includes 7 excitation transformers, Each grid-side module is connected to an excitation transformer through the grid-connected / soft-start circuit breaker 4, and the excitation transformer is used to connect to the grid; the control module controls the connection of the machine-side ...

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Abstract

The invention relates to the field of power electronics and power transmission control, in particular to an alternating-current excitation system and a PWM control method of a grid-side converter of the alternating-current excitation system. The grid-side converter in the system comprises a plurality of grid-side modules which are connected in parallel, and each grid-side module is connected withan isolation type excitation transformer of the same type. According to the method, triangular carrier waves of all the grid-side modules are sequentially subjected to phase shifting by a set angle and compared with modulated waves of all the grid-side modules, and driving pulses corresponding to the grid-side modules are generated. Due to the fact that the excitation transformers on a grid side have no phase shift, after the triangular carrier waves are compared with the modulated waves, the driving pulses of all the grid-side modules are only staggered by the phase shift angle of the triangular carrier waves, and output harmonic waves are subjected to phase shift superposition, so the harmonic amplitude of total currents after parallel connection is reduced. The non-phase-shift isolationtransformers are used in the invention, so the design and production cost of the transformers is reduced through the non-phase-shift design, and a precision requirement is reduced; and a parallel circulation path is blocked through the isolation type design, so the problem of circulation is avoided.

Description

technical field [0001] The invention relates to the field of power electronics and electric drive control, in particular to a PWM control method for an AC excitation system and a grid-side converter thereof. Background technique [0002] In recent years, the grid-connected capacity of new energy grid-connected generator sets has been increasing. Due to the randomness of wind power and photovoltaic power generation, higher requirements have been placed on the peak-shaving and frequency-regulating capabilities of the grid. As the best tool for peak-shaving and valley-filling Pumped storage power station. As a comprehensive auxiliary management tool for the power grid, the pumped storage power station uses water energy conversion as a carrier to provide energy storage services and multi-working-condition dispatching operations for the system, and undertakes peak regulation, valley filling, frequency regulation, phase regulation, emergency backup, and blackout operations in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/01H02M7/5395
CPCH02J3/38H02J3/01H02M7/5395Y02E40/40
Inventor 陈旭东姚为正高洪来璐冯宇鹏王青龙吴金龙牛化鹏刘刚
Owner XIAN XJ POWER ELECTRONICS TECH
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