CN109038494B - Phase modifier field loss protection excitation low-voltage judgment method - Google Patents
Phase modifier field loss protection excitation low-voltage judgment method Download PDFInfo
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- CN109038494B CN109038494B CN201810933020.2A CN201810933020A CN109038494B CN 109038494 B CN109038494 B CN 109038494B CN 201810933020 A CN201810933020 A CN 201810933020A CN 109038494 B CN109038494 B CN 109038494B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/06—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors
- H02H7/065—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors against excitation faults
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- Protection Of Generators And Motors (AREA)
Abstract
The invention discloses a kind of phase modifier field loss protection excitation low-voltage judgment methods; using root-mean-square valve criterion and pulse wave root-mean-square valve criterion as main criterion; loss of excitation failure and phase modifier depth leading phase operation can be accurately distinguished, can identify the loss of excitation failure of the types such as complete loss of excitation and partial loss of excitation；Average value high level criterion is as assistant criteria to having protected the effect of checking on simultaneously; its definite value is not needed according to the minimum excitation voltage adjusting escaped when phase modifier operates normally; it can adjust as higher value; minimum excitation voltage when average value low value criterion can be operated normally according to phase modifier is escaped is adjusted; as the assistant criteria of excitation low voltage criterion, for preventing inverter mode or unusual service condition from leading to excitation low voltage criterion tripping.
Description
Technical field
The present invention relates to a kind of phase modifier field loss protection excitation low-voltage judgment methods, belong to relay protection of power system neck
Domain.
Background technique
Loss of excitation failure is a kind of failure that the synchronous motor with energized circuit such as synchronous generator and phase modifier may occur
Type.After loss of excitation failure occurs, a series of variation occurs for synchronous motor generator terminal electrical quantity, and synchronous motor will gradually transition
To asynchronous operation.One side synchronous motor will issue less idle or absorb from system more idle, may cause and be
It unites idle deficiency；Another aspect synchronous motor will generate difference frequency electric current in rotor windings after being transitioned into asynchronous operation, cause to turn
Sub- heating in winding.
In order to reduce destruction of the loss of excitation failure to synchronous motor and place system, generator protection can all configure field loss protection.
For generator, field loss protection has impedance circle, excitation low-voltage, generator terminal low-voltage and the reversed idle criterion for waiting maturation, loss of excitation
It protects fairly perfect.For phase modifier field loss protection, since phase modifier does not have active power to exchange with system, loss of exicitation is protected
Shield acts on most significant impedance circle criterion and cannot use, therefore excitation low-voltage, the criterions such as generator terminal low-voltage will become phase modulation
The main criterion of machine field loss protection.
As the excitation low voltage criterion of phase modifier field loss protection main criterion, actuating quantity is excitation voltage, is encouraged at present
Magnetic low voltage criterion uses its average value, and when phase modifier work is in depth leading phase operation, excitation voltage average value is very
Small, if excitation low voltage criterion is adjusted according to minimum excitation voltage when escaping depth leading phase operation, field loss protection excitation is low
Voltage criterion will not work substantially since definite value is too small, and if adjusting definite value is higher, it would be possible in phase modifier into phase
Criterion malfunctions when to a certain extent.In addition when partial loss of excitation occurs, since loss of excitation is not very seriously, excitation voltage very may be used
Setting valve can be dropped to hereinafter, existing field loss protection excitation low voltage criterion is also possible to tripping.In conclusion existing
Excitation low voltage criterion can not be suitable for phase modifier field loss protection.
Summary of the invention
The present invention provides a kind of phase modifier field loss protection excitation low-voltage judgment methods, solve existing excitation low-voltage
Criterion can not be suitable for the problem of phase modifier field loss protection.
In order to solve the above-mentioned technical problem, the technical scheme adopted by the invention is that:
Phase modifier field loss protection excitation low-voltage judgment method, includes the following steps,
1) equal interval sampling is carried out to excitation voltage, N point is sampled inside every cycle time, N is the integral multiple of L；
2) it calculates field loss protection and acts sampling number Nset；
3) following processing is done to each sampled point n；
Arithmetic mean of instantaneous value E of the calculating sampled point n toward top n sampled point excitation voltagemean(n)；
Root-mean-square valve E of the calculating sampled point n toward top n sampled point excitation voltagerms(n)；
Calculate the root-mean-square valve E of sampled point n N/L sampled point excitation voltage forwardpul.rms(n)；
Calculate Epul.rms(n-k*N/L), the maximum value E of the total L data of k=0 ..., L-1pul.rmsmax(n) and minimum value
Epul.rmsmin(n)；
Calculate Epul.rmsmax(n) and Epul.rmsmin(n) difference and Epul.rmsmax(n) ratio Epul.rms.d(n)；
Judge Emean(n) whether it is less than the low high level definite value E of average value of adjustingmax.meanset, if it is, average value high level
Criterion movement mark bmax.meanIt (n)=1 is otherwise, 0；
Judge Emean(n) whether it is less than the average value low value definite value E of adjustingmin.meanset, if it is, average value low value
Criterion movement mark bmin.meanIt (n)=1 is otherwise, 0；
Judge Erms(n) whether it is less than the low definite value E of root-mean-square valve of adjustingrmsset, if it is, root-mean-square valve criterion acts
Indicate brmsIt (n)=1 is otherwise, 0；
Judge Epul.rms.d(n) whether it is greater than the pulse wave root-mean-square valve definite value E of adjustingpul.rms.dset, if it is, pulse wave side
Equal root criterion movement mark bpul.rms.dIt (n)=1 is otherwise, 0；
By brms(n) and bpul.rms.d(n) logic or the result and b of operationmax.mean(n) logic and operation, logical AND are carried out
The result and b of operationmin.mean(n) logic or operation are carried out, the final mark b of sampled point n is obtainedop.s(n)；
If 4) current sampling point N forwardsetThe final mark of a sampled point is all 1, then excitation low voltage criterion acts.
Field loss protection acts sampling number,
Nset=tset*N/T
Wherein, tsetFor the field loss protection actuation time of adjusting, T is the one cycle time of excitation voltage.
The one cycle time of excitation voltage is the minimum period of the alternating voltage before rectifying.
Epul.rms.d(n) specific formula is,
Epul.rms.d(n)=[Epul.rmsmax(n)-Epul.rmsmin(n)]/Epul.rmsmax(n)。
L=3 or 6.
If current sampling point N forwardsetThe final mark of a sampled point is not all 1, then excitation low voltage criterion is failure to actuate.
Advantageous effects of the invention: the present invention is using root-mean-square valve criterion and pulse wave root-mean-square valve criterion as main
Criterion can accurately distinguish loss of excitation failure and phase modifier depth leading phase operation, can identify the types such as complete loss of excitation and partial loss of excitation
Loss of excitation failure；As assistant criteria to having protected the effect of checking on, definite value is not needed according to hiding average value high level criterion simultaneously
Minimum excitation voltage adjusting when phase modifier operates normally is crossed, can be adjusted as higher value, average value low value criterion can be by
According to the minimum excitation voltage adjusting escaped when phase modifier operates normally, as the assistant criteria of excitation low voltage criterion, for preventing
Only inverter mode or unusual service condition lead to excitation low voltage criterion tripping.
Detailed description of the invention
Fig. 1 is logic chart of the invention.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
As shown in Figure 1, phase modifier field loss protection excitation low-voltage judgment method, comprising the following steps:
1) equal interval sampling is carried out to excitation voltage, N point is sampled inside every cycle time T, the cycle time is excitation
The minimum period of alternating voltage before voltage commutation, N are the integral multiple of L, L=3 or 6.
2) it calculates field loss protection and acts sampling number Nset。
Field loss protection acts sampling number,
Nset=tset*N/T
Phase modifier field loss protection provides 5 setting valves and adjusts for user, the respectively low high level definite value E of average valuemax.meanset、
Average value low value definite value Emin.meanset, the low definite value E of root-mean-square valvermsset, pulse wave root-mean-square valve definite value Epul.rms.dset, loss of excitation protect
Protect actuation time tset。
3) following processing is done to each sampled point:
31) arithmetic mean of instantaneous value E of the calculating sampled point n toward top n sampled point excitation voltagemean(n)；
32) root-mean-square valve E of the calculating sampled point n toward top n sampled point excitation voltagerms(n)；
33) the root-mean-square valve E of sampled point n N/L sampled point excitation voltage forward is calculatedpul.rms(n)；
34) E is calculatedpul.rms(n-k*N/L), the maximum value E of the total L data of k=0 ..., L-1pul.rmsmax(n) and minimum value
Epul.rmsmin(n)；
35) E is calculatedpul.rmsmax(n) and Epul.rmsmin(n) difference and Epul.rmsmax(n) ratio Epul.rms.d(n)；, tool
Body formula are as follows: Epul.rms.d(n)=[Epul.rmsmax(n)-Epul.rmsmin(n)]/Epul.rmsmax(n)；
36) judge Emean(n) whether it is less than the low high level definite value E of average value of adjustingmax.meanset, if it is, average value
High level criterion movement mark bmax.meanIt (n)=1 is otherwise, 0；
37) judge Emean(n) whether it is less than the average value low value definite value E of adjustingmin.meanset, if it is, average value
Low value criterion movement mark bmin.meanIt (n)=1 is otherwise, 0；
38) judge Erms(n) whether it is less than the low definite value E of root-mean-square valve of adjustingrmsset, if it is, root-mean-square valve criterion
Movement mark brmsIt (n)=1 is otherwise, 0；
39) judge Epul.rms.d(n) whether it is greater than the pulse wave root-mean-square valve definite value E of adjustingpul.rms.dset, if it is, arteries and veins
Wave root-mean-square valve criterion movement mark bpul.rms.dIt (n)=1 is otherwise, 0；
310) to brms(n) and bpul.rms.d(n) logic or operation are carried out, mark b is obtainedrms.or(n)；
311) to bmax.mean(n) and brms.or(n) logic and operation is carried out, mark b is obtainedtemp(n)；
312) to bmin.mean(n) and btemp(n) logic or operation are carried out, the final mark b of sampled point n is obtainedop.s(n)。
If 4) current sampling point N forwardsetThe final mark of a sampled point is all 1, then excitation low voltage criterion acts, no
Then excitation low voltage criterion is failure to actuate.
When phase modifier depth leading phase operation, excitation voltage root-mean-square valve is not 0, by three-phase bridge rectifier circuit
It calculates, when IGBT group angle is 90 °, excitation voltage average value reaches minimum value 0 in 0-90 ° of phase shift range, at this time side
Although equal root also reaches minimum value in phase shift range, which is 30.8% of maximum value in phase shift range.It loses completely
Excitation voltage is endless when magnetic is all 0, the excitation voltage come out with mean value calculation when phase modifier depth leading phase operation close to 0
It is difficult to distinguish, but the excitation voltage calculated with 30.8% root-mean-square valve uses root-mean-square valve there are biggish difference
Criterion can effectively distinguish the operating condition of phase modifier depth leading phase operation and complete loss of excitation.
When there is a situation where partial loss of excitation such as pulse-losings, pulse wave root-mean-square valve criterion will be due to the Fang Jun of the pulse wave of loss
Root has larger difference with other pulse waves and acts, and when operating normally, pulse wave root-mean-square valve criterion will not act.Pulse wave Fang Jun
Root criterion may determine that the failure of the partial loss of excitation such as pulse missing.
Using root-mean-square valve criterion and pulse wave root-mean-square valve criterion as main criterion, loss of excitation failure and phase modulation can be accurately distinguished
Machine depth leading phase operation can identify the loss of excitation failure of the types such as complete loss of excitation and partial loss of excitation；Average value high level criterion simultaneously
As assistant criteria to the effect of checking on has been protected, definite value is not needed according to the minimum excitation electricity escaped when phase modifier operates normally
Repoussage is fixed, can adjust as higher value, minimum when average value low value criterion can be operated normally according to phase modifier is escaped is encouraged
Magnetoelectricity repoussage is fixed, as the assistant criteria of excitation low voltage criterion, for preventing inverter mode or unusual service condition from leading to excitation
Low voltage criterion tripping.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (6)
1. phase modifier field loss protection excitation low-voltage judgment method, it is characterised in that: include the following steps,
1) equal interval sampling is carried out to excitation voltage, N point is sampled inside every cycle time, N is the integral multiple of L；
2) it calculates field loss protection and acts sampling number Nset；
3) following processing is done to each sampled point；
Arithmetic mean of instantaneous value E of the calculating sampled point n toward top n sampled point excitation voltagemean(n)；
Root-mean-square valve E of the calculating sampled point n toward top n sampled point excitation voltagerms(n)；
Calculate the root-mean-square valve E of sampled point n N/L sampled point excitation voltage forwardpul.rms(n)；
Calculate Epul.rms(n-k*N/L), the maximum value E of the total L data of k=0 ..., L-1pul.rmsmax(n) and minimum value
Epul.rmsmin(n)；
Calculate Epul.rmsmax(n) and Epul.rmsmin(n) difference and Epul.rmsmax(n) ratio Epul.rms.d(n)；
Judge Emean(n) whether it is less than the low high level definite value E of average value of adjustingmax.meanset, if it is, average value high level criterion
Movement mark bmax.meanIt (n)=1 is otherwise, 0；
Judge Emean(n) whether it is less than the average value low value definite value E of adjustingmin.meanset, if it is, average value low value criterion
Movement mark bmin.meanIt (n)=1 is otherwise, 0；
Judge Erms(n) whether it is less than the low definite value E of root-mean-square valve of adjustingrmsset, if it is, root-mean-square valve criterion movement mark
brmsIt (n)=1 is otherwise, 0；
Judge Epul.rms.d(n) whether it is greater than the pulse wave root-mean-square valve definite value E of adjustingpul.rms.dset, if it is, pulse wave r.m.s.
It is worth criterion movement mark bpul.rms.dIt (n)=1 is otherwise, 0；
By brms(n) and bpul.rms.d(n) logic or the result and b of operationmax.mean(n) logic and operation, logic and operation are carried out
Result and bmin.mean(n) logic or operation are carried out, the final mark b of sampled point n is obtainedop.s(n)；
If 4) current sampling point N forwardsetThe final mark of a sampled point is all 1, then excitation low voltage criterion acts.
2. phase modifier field loss protection excitation low-voltage judgment method according to claim 1, it is characterised in that: field loss protection
Acting sampling number is,
Nset=tset*N/T
Wherein, tsetFor the field loss protection actuation time of adjusting, T is the one cycle time of excitation voltage.
3. phase modifier field loss protection excitation low-voltage judgment method according to claim 2, it is characterised in that: excitation voltage
One cycle time was the minimum period of the alternating voltage before rectifying.
4. phase modifier field loss protection excitation low-voltage judgment method according to claim 1, it is characterised in that: Epul.rms.d
(n) specific formula is,
Epul.rms.d(n)=[Epul.rmsmax(n)-Epul.rmsmin(n)]/Epul.rmsmax(n)。
5. phase modifier field loss protection excitation low-voltage judgment method according to claim 1, it is characterised in that: L=3 or 6.
6. phase modifier field loss protection excitation low-voltage judgment method according to claim 1, it is characterised in that: if currently adopting
Sampling point N forwardsetThe final mark of a sampled point is not all 1, then excitation low voltage criterion is failure to actuate.
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| CN110061475B (en) * | 2019-03-22 | 2022-10-11 | 中国电力科学研究院有限公司 | Phase modulator loss-of-field protection method and system based on influence degree on system |
| CN111123099B (en) * | 2019-12-10 | 2022-03-29 | 国电南瑞科技股份有限公司 | Partial field loss fault identification method for pulse loss |
| CN111509668B (en) * | 2020-04-23 | 2022-06-28 | 南京南瑞继保电气有限公司 | Phase modulator loss-of-field protection method and device and electronic equipment |
| CN111711169B (en) * | 2020-05-05 | 2022-03-25 | 许昌开普检测研究院股份有限公司 | Pumped storage unit magnetic loss protection judgment method |
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| CN107656203B (en) * | 2017-09-11 | 2019-08-09 | 中国农业大学 | A kind of loss of excitation fault detection method of magneto alternator |
| CN107689622B (en) * | 2017-10-11 | 2019-09-03 | 安徽新力电业科技咨询有限责任公司 | The field loss protection acting characteristic curve for relating to the check of net definite value generates and check method |
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