CN102064757B - Generator accident reinforced excitation circuit - Google Patents

Generator accident reinforced excitation circuit Download PDF

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Publication number
CN102064757B
CN102064757B CN2010106031560A CN201010603156A CN102064757B CN 102064757 B CN102064757 B CN 102064757B CN 2010106031560 A CN2010106031560 A CN 2010106031560A CN 201010603156 A CN201010603156 A CN 201010603156A CN 102064757 B CN102064757 B CN 102064757B
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China
Prior art keywords
diode
rectifier
excitation
rotor winding
reinforced
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CN2010106031560A
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CN102064757A (en
Inventor
黄大可
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China Three Gorges Corp
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China Three Gorges Corp
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Abstract

The invention relates to a generator accident reinforced excitation circuit, wherein the secondary side of an excitation transformer is a duplex winding which is respectively connected with a first rectifier and a second rectifier; the first rectifier is connected with a first diode and a rotor winding in series; the second rectifier is connected with a second diode and the rotor winding in series; one end of the rotor winding is connected with the anode of the first diode, and the other end of the rotor winding is connected with the cathode of the second diode; and a thyristor switch is connected between the cathode of the first diode and the anode of the second diode. By the structure innovation of the excitation main circuit, the invention completely optimizes the function features of the system, improves the parameter performance under an normal operation condition, achieves the purposes of high safety of 99.99%, high efficiency, energy saving, consumption reduction, and the like during long-term operation of an excitation system, reduces the cost of high-parameter excitation configuration, is favorable for safe operation for a long term, and ensures sufficient supply of accident reinforced excitation to generators.

Description

A kind of generator accident forced exciting circuit
Technical field
The present invention relates to a kind of synchronous generator accident forced exciting circuit, belong to big-and-middle-sized synchronous generator stationary rectifier excitation system field.
Background technology
Conventional electric generators stationary rectifier excitation circuit exists parameter configuration high, and utilization rate of equipment and installations is low, running wastage is big, a series of disadvantages such as overvoltage height during the thyristor commutation, and the accident that reality provides for generator is the ability of encouraging problem such as be difficult to meet design requirement by force.
Summary of the invention
The purpose of this invention is to provide a kind of forced exciting circuit; Solve field circuit parameter configuration height in the prior art; Problems such as utilization rate of equipment and installations is low, running wastage is big, commutation overvoltage height; Through structure optimization, realize the parallel running and the flexibility conversion of connecting and encouraging by force of rectifier power source to excitation system.
For solving the problems of the technologies described above; The objective of the invention is to realize like this: a kind of generator accident forced exciting circuit; The excitation transformer secondary side is a double winding; Double winding connects first rectifier, second rectifier respectively, first rectifier and first diode, rotor windings in series, second rectifier and second diode, rotor windings in series; Rotor winding one end connects first diode anode, the other end connects second diode cathode, also is serially connected with thyristor switch between first diode cathode and second diode anode.
A kind of generator accident of the present invention forced exciting circuit adopts double-winding structure, and rectifier is divided into groups to supply power, and the thorough separation on the source, normal rectification move two groups of rectifiers in the load end parallel connection, export exciting current jointly; Through encouraging change-over circuit by force, realize the mode of encouraging by force of voltage stack when needing accident to encourage by force.
The voltage superimposed type is encouraged circuit by force, guarantee to encourage by force for accident provide encourage ability by force in, promptly satisfy systematic failures less than 0.01% probability; Again through optimizing the functional structure of excitation main body circuit; Cooperating excitation to become transforms; It is high to have solved traditional field circuit parameter configuration, a series of disadvantages such as utilization rate of equipment and installations is low, running wastage is big, commutation overvoltage height, and the reality ability of encouraging problem such as be difficult to meet design requirement by force.
Structure innovation through excitation main body circuit; Comprehensively optimized the functional characteristic of system; Improved the performance parameters under the normality service conditions, also fine when having solved the excitation system long-time running greater than 99.99% fail safe, high efficiency and problem such as energy-saving and cost-reducing, and reduced the cost of high parameter excitation arrangement; Help operation steady in a long-term, and guarantee that the accident that provides enough encourages ability by force to generator.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is described further:
Fig. 1 is a structural representation of the present invention.
Embodiment
A kind of generator accident forced exciting circuit; Excitation transformer ZB secondary side is a double winding; Double winding connects the first rectifier Z1, the second rectifier Z2 respectively; The first rectifier Z1 connects with the first diode V1, rotor winding L, and the second rectifier Z2 connects with the second diode V2, rotor winding L, and rotor winding L one end connects the first diode V1 anode, the other end connects the second diode V2 negative electrode; Also be serially connected with thyristor switch QK between the first diode V1 negative electrode and the second diode V2 anode, as the executive component of encouraging action by force.
Normal operating condition:
Encourage switch S CR blocking-up by force, the first rectifier Z1 and the parallelly connected output of the second rectifier Z2, and can regulate and control the output current current-sharing respectively, because power supply is independent, current-sharing realizes being more prone to.
Exciting voltage UL=UZ1=UZ2 ULmax=1.3 ~ 1.5Ufn
If=I1+I2 Iqk=0
The excitation output voltage is rectifier voltage, and about a=50 ° of rectifier pilot angle can provide the adjusting range of 1.5Vfn, and rectification becomes secondary voltage and is merely 60~70% of existing anode voltage, and usage ratio of equipment significantly improves.
Accident is encouraged state by force:
Encourage switch S CR triggering and conducting by force, the first rectifier Z1 and the second rectifier Z2 are automatically converted to series system, then realize the state of encouraging by force of high limited value, field-forcing voltage ULq=UZ1+UZ2=(1.3 ~ 1.5) 2UZ.
Exciting current is begun to increase to encouraging the top value by force by Ifo=I1+I2, and its final value is by encouraging the electric current limit decision by force, and excitation output field-forcing voltage is that the first rectifier Z1 and the second rectifier Z2 voltage sum reach the more high-strength top value of encouraging.Encourage function operations by force and just switch realization by additional thyristor SCR switch QK.If encourage release by force; Then cut off the triggering signal of the switch QK of thyristor SCR; Make a certain group of rectifier inversion 10~20ms among the first rectifier Z1 and the second rectifier Z2 simultaneously, the switch QK of thyristor SCR is oppositely closed, field circuit is replied normal condition.

Claims (1)

1. generator accident forced exciting circuit; It is characterized in that: excitation transformer (ZB) secondary side is a double winding; Double winding connects first rectifier (Z1), second rectifier (Z2) respectively; First rectifier (Z1) is connected with first diode (V1), rotor winding (L); Second rectifier (Z2) is connected with second diode (V2), said rotor winding (L), and said rotor winding (L) end connects first diode (V1) anode, the other end connects second diode (V2) negative electrode, also is serially connected with thyristor switch (QK) between first diode (V1) negative electrode and second diode (V2) anode.
CN2010106031560A 2010-12-24 2010-12-24 Generator accident reinforced excitation circuit Active CN102064757B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010106031560A CN102064757B (en) 2010-12-24 2010-12-24 Generator accident reinforced excitation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2010106031560A CN102064757B (en) 2010-12-24 2010-12-24 Generator accident reinforced excitation circuit

Publications (2)

Publication Number Publication Date
CN102064757A CN102064757A (en) 2011-05-18
CN102064757B true CN102064757B (en) 2012-11-07

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104993758B (en) * 2015-07-31 2018-02-23 华中科技大学 A kind of brushless double fed shaft electricity generation system short-time overload control device and control method
CN105099308B (en) * 2015-09-22 2018-06-29 东方电机控制设备有限公司 A kind of generator excitation unit
EP3393036A1 (en) * 2017-04-20 2018-10-24 ABB Schweiz AG Power generation systemtechnical field
CN107834922B (en) * 2017-11-08 2019-11-08 华北电力科学研究院有限责任公司 A kind of condition control method and device of the limitation of field regulator stator current
CN112952784A (en) * 2021-02-24 2021-06-11 国网浙江省电力有限公司电力科学研究院 Excitation becomes overload limiter suitable for flexible excitation system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE502005010890D1 (en) * 2004-10-28 2011-03-03 Alstom Technology Ltd STATIC EXTRACTION SYSTEM FOR A GENERATOR AND METHOD FOR OPERATING SUCH AN EXTRACTION SYSTEM
ES2325729B2 (en) * 2009-02-19 2010-09-27 Universidad Politecnica De Madrid QUICK DEEXCITATION SYSTEM FOR SYNCHRONOUS MACHINES WITH INDIRECT EXCITATION.
CN101741193A (en) * 2010-01-14 2010-06-16 刘志新 Series hybrid excitation synchronous generator
CN201616659U (en) * 2010-01-27 2010-10-27 东方电气集团东方电机有限公司 Multi-modular redundancy deexcitation protection circuit
CN101860313B (en) * 2010-05-27 2013-04-10 国电南瑞科技股份有限公司 Self-excited synchronous generator alternating current excitation initiating circuit
CN201887713U (en) * 2010-12-24 2011-06-29 中国长江三峡集团公司 Reinforced excitation circuit for handling electric generator accidents

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