CN103487680A - Converter valve commutation failure distinguishing method - Google Patents
Converter valve commutation failure distinguishing method Download PDFInfo
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- CN103487680A CN103487680A CN201310412301.0A CN201310412301A CN103487680A CN 103487680 A CN103487680 A CN 103487680A CN 201310412301 A CN201310412301 A CN 201310412301A CN 103487680 A CN103487680 A CN 103487680A
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Abstract
The invention relates to a converter valve distinguishing method, in particular to a converter valve commutation failure distinguishing method. The converter valve commutation failure distinguishing method comprises the steps that firstly, the operation states of a thyristor inside a converter valve are measured, minimum turn-off angles gammas<min> needed in the turn-off process of the thyristor are determined, then the minimum turn-off angle gamma<min> of each thyristor level is compared with a system turn-off angle gamma, the number of commutation failures of series-connection thyristor levels inside the same bridge arm is counted, and whether commutation failures occur to the bridge arm or not is analyzed comprehensively, wherein the operations states comprise the thyristor junction temperature Tj, the current descent rate di/dt, the back pressure borne in the turn-off process Vrr, the on state current IF and the like. According to the converter valve distinguishing method, actual criteria of the commutation failures are obtained by determining the dynamic minimum turn-off angle gamma<min>; and adjustment of the turn-off angle control margin by a direct current transmission control protection system is facilitated.
Description
Technical field
The present invention relates to a kind of method of discrimination of converter valve, specifically relate to a kind of converter valve commutation failure method of discrimination.
Background technology
Commutation failure (Commutation Failure, CF) be the comparatively common failure mode of inverter, when two valves carry out commutation, because of commutation process fail to carry out complete, or after the valve breakdown estimate turn-offed, fail to recover blocking ability during reverse voltage, when the voltage be added on this valve is timing, conducting again, switch phase immediately, make to estimate that the valve of opening turn-offs again, this phenomenon is referred to as commutation failure.The commutation failure fault can cause many adverse consequencess, and as the straight-flow system lower voltage, electric current increases, and transmission power reduces, the converter valve lost of life etc.When occurring continuously or simultaneously during commutation failure, likely causing straight-flow system to be stopped transport.In electrical network, because the DC engineering transmission capacity promotes, the problems such as multi-infeed HVDC and the weak interchange of large direct current cause the risk of commutation failure further to improve.
Commutation failure is in the nature: when electrical network breaks down, in advance, the commutation overlap angle of changing phase valve arm will increase line voltage zero-cross point, close angle of rupture γ and will reduce and be less than the required minimum turn-off angle γ of thyristor
min, the commutation brachium pontis loses the forward blocking ability, causes commutation failure.
According to engineering experience, generally the criterion of commutation failure had to following two kinds: 1) alternating voltage drops into a threshold value and just is considered as commutation failure; 2) think the minimum turn-off angle γ of thyristor
minfor certain value, generally be set as 8 degree, once closing the angle of rupture, DC transmission system is less than this definite value, commutation failure will occur.In fact, the minimum turn-off angle γ of thyristor
min(the corresponding time is t
q, μ
s) be a dynamic parameter, relevant with running status and the process conditions of thyristor, as thyristor junction temperature T
j, the back-pressure V that bears of electric current rate of descent di/dt, turn off process
rr, on state current I
f, minority carrier life time τ
petc..
Summary of the invention
For the deficiencies in the prior art, the purpose of this invention is to provide a kind of converter valve commutation failure method of discrimination, the method obtains thyristor minimum turn-off angle γ accurately
min, and by analyzing the γ of each thyristor level in same brachium pontis
min, by differentiating the commutation failure number of series thyristor level, the commutation situation of the whole change of current brachium pontis of analysis-by-synthesis, and using this as the commutation failure criterion.
The objective of the invention is to adopt following technical proposals to realize:
The invention provides a kind of converter valve commutation failure method of discrimination, the system that described method is used is the converter valve system, by a plurality of converter valve modules, the structure with eclipsed form is composed in series described converter valve system, two valve modules are connected in series and form the converter valve module, be connected to form the valve module of converter valve with saturable reactor after several thyristor level series connection, the utility appliance at single thyristor and two ends thereof forms the thyristor level again; Its improvements are, the dynamic minimum turn-off angle of described method based on thyristor, comprise the steps:
(1) test many data of lower turn-off time of operational factor;
(2) function of matching turn-off time to each operational factor;
(3) residual analysis judge whether maximum residul difference is less than 30～40us;
(4) determine the minimum turn-off angle of thyristor turn off process;
(5) relatively the minimum turn-off angle of each thyristor level and system are closed the angle of rupture;
(6) judge whether brachium pontis commutation failure occurs.
Further, stray capacitance in described utility appliance damping circuit, the equal hydraulic circuit of direct current, thyristor, saturable reactor and valve; Form the equal hydraulic circuit of damping circuit-direct current-thyristor parallel branch after described damping circuit, the equal hydraulic circuit of direct current and thyristor parallel connection, the equal hydraulic circuit of damping circuit-direct current-thyristor parallel branch is connected in parallel with stray capacitance in valve with saturable reactor.
Further, in described step (1), by measuring the turn-off time t of thyristor under different service conditions
q, obtain the corresponding turn-off time t of thyristor minimum turn-off angle
qdata and curves.
Further, in described step (2), according to test figure, carry out multiple linear regression analysis matching t
qto the function of each operational factor, its expression formula is as follows:
Obtain formula<1 by Mathematical Fitting>in coefficient: β
0, β
1, β
2, β
3and β
4;
Each operational factor comprises: thyristor junction temperature T
j, the back-pressure V that bears of electric current rate of descent di/dt, turn off process
rr, on state current I
f.
Further, in described step (3), utilize test figure to carry out residual analysis to Regression Analysis Result, residual analysis is for judging the matching effect of multiple linear regression model.Really.
Further, in described step (4), during the operating brachium pontis commutation of converter valve, each thyristor level in brachium pontis is carried out to operational parameter detection, obtain the minimum turn-off angle γ in each thyristor level actual motion
min;
Wherein, electric current rate of descent di/dt, the back-pressure V that turn off process bears
rr, on state current I
ftE plate by thyristor is measured, thyristor junction temperature T
jmeasure minimum turn-off angle γ by being embedded in the thyristor internal temperature sensor
minby following expression formula, meaned:
Further, the converter valve brachium pontis is in series by valve module; Each valve module is in series with reactor; Described valve module consists of the thyristor of series connection, and the control utmost point and the negative electrode of each thyristor are connected with the gate pole unit, and each thyristor is parallel with resistance branch and resistance-capacitance branch road.
Further, in described step (5), respectively by the γ of each thyristor level
minclose angle of rupture γ with system and compare, record γ
minthe thyristor progression N of<γ
cF, and calculate thyristor progression N
cFproportion k in whole brachium pontis
cF, expression formula is as follows:
Wherein: N
tfor brachium pontis series thyristor level sum.
Further, in described step (6), judgement thyristor progression N
cFproportion k in whole brachium pontis
cFwhether exceed 30%, if exceed 30%, judge the brachium pontis commutation failure; Otherwise, judge brachium pontis commutation success.
Compared with the prior art, the beneficial effect that the present invention reaches is:
1, the invention provides a kind of based on dynamic minimum turn-off angle γ
minconverter valve commutation failure method of discrimination, can obtain thyristor minimum turn-off angle γ comparatively accurately
min, and by analyzing the γ of each thyristor level in same brachium pontis
min, by differentiating the commutation failure number of series thyristor level, the commutation situation of the whole change of current brachium pontis of analysis-by-synthesis, and using this as the commutation failure criterion.
2, the present invention is by determining dynamic minimum turn-off angle γ
minobtain the actual criterion of commutation failure; Angle of rupture control nargin is closed in the control protection system adjustment that is conducive to direct current transportation.
The accompanying drawing explanation
Fig. 1 is the electrical schematic diagram of valve module provided by the invention;
Fig. 2 is the minimum turn-off angle γ of certain model thyristor provided by the invention
min(the corresponding time is t
q, μ
s) at different junction temperature T
jthe graph of a relation of electric current rate of descent di/dt under condition;
Fig. 3 is the minimum turn-off angle γ of certain model thyristor provided by the invention
min(the corresponding time is t
q, μ
s) under different di/dt conditions with T
jgraph of a relation;
Fig. 4 is the residual plot after certain model thyristor turn-off time linear regression analysis provided by the invention;
Fig. 5 is the workflow diagram of the converter valve commutation failure method of discrimination based on the dynamic pass angle of rupture provided by the invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Converter valve commutation failure method of discrimination based on the dynamic pass angle of rupture provided by the invention, with system be the converter valve system, by a plurality of converter valve modules, the structure with eclipsed form is composed in series described converter valve system, two valve modules are connected in series and form the converter valve module, be connected to form the valve module of converter valve with saturable reactor after several thyristor level series connection, the utility appliance at single thyristor and two ends thereof forms the thyristor level again; Stray capacitance in utility appliance damping circuit, the equal hydraulic circuit of direct current, thyristor, saturable reactor and valve; Form the equal hydraulic circuit of damping circuit-direct current-thyristor parallel branch after described damping circuit, the equal hydraulic circuit of direct current and thyristor parallel connection, the equal hydraulic circuit of damping circuit-direct current-thyristor parallel branch is connected in parallel with stray capacitance in valve with saturable reactor.
Converter valve commutation failure method of discrimination workflow diagram as shown in Figure 5, comprises the steps:
(1) by measuring the turn-off time t of thyristor under different service conditions of certain model
q, obtain the corresponding turn-off time t of thyristor minimum turn-off angle
qdata and curves, as Fig. 2 and Fig. 3.Fig. 2 measures under the junction temperature condition that do not coexist, turn-off time t
qchange curve with di/dt; Fig. 3 measures under different di/dt conditions, turn-off time t
qchange curve with junction temperature.
(2) carry out multiple linear regression analysis matching t according to test figure
qfunction to each operational factor:
Obtain formula<1 by Mathematical Fitting>in accurate coefficient: β
0, β
1, β
2, β
3and β
4.
(3) utilize test figure to carry out residual analysis to Regression Analysis Result, and judge whether maximum residul difference is less than 30～40us.Can obtain residual plot shown in Fig. 4, judge according to this precision of Regression Analysis Result.Fig. 4 is done to simple declaration.Fig. 4 is for to retouch formed figure on planimetric coordinates by the residual error of each independent variable.Equal 0 the upper and lower random scatter of straight line when the point of describing around residual error, illustrate that regression straight line is all right to the matching of former observed reading.
(4) during operating certain the brachium pontis commutation of converter valve, each thyristor level in this brachium pontis is carried out to operational parameter detection, obtain the γ in each thyristor level actual motion
min.The converter valve brachium pontis is in series by the valve module shown in some Fig. 1.
Wherein, electric current rate of descent di/dt, the back-pressure V that turn off process bears
rr, on state current I
ftE plate by thyristor is measured, thyristor junction temperature T
jmeasure minimum turn-off angle γ by being embedded in the thyristor internal temperature sensor
minby following expression formula, meaned:
(5) respectively by the γ of each thyristor level
minclose angle of rupture γ with system and compare, record γ
minthe thyristor progression N of<γ
cF, and calculate thyristor progression N
cFproportion k in whole brachium pontis
cF:
Wherein: N
tfor this brachium pontis series thyristor level sum.
(6) judgement thyristor progression N
cFproportion k in whole brachium pontis
cFwhether exceed 30% left and right, judge whether commutation failure of this brachium pontis: if exceed 30% left and right, judge the brachium pontis commutation failure; Otherwise, judge brachium pontis commutation success.
The present invention is by determining dynamic minimum turn-off angle γ
minobtain the actual criterion of commutation failure; Angle of rupture control nargin is closed in the control protection system adjustment that is conducive to direct current transportation.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment, the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.
Claims (9)
1. a converter valve commutation failure method of discrimination, the system that described method is used is the converter valve system, by a plurality of converter valve modules, the structure with eclipsed form is composed in series described converter valve system, two valve modules are connected in series and form the converter valve module, be connected to form the valve module of converter valve with saturable reactor after several thyristor level series connection, the utility appliance at single thyristor and two ends thereof forms the thyristor level again; It is characterized in that, the dynamic minimum turn-off angle of described method based on thyristor, comprise the steps:
(1) test many data of lower turn-off time of operational factor;
(2) function of matching turn-off time to each operational factor;
(3) residual analysis, and judge whether maximum residul difference is less than 30～40us;
(4) determine the minimum turn-off angle of thyristor turn off process;
(5) relatively the minimum turn-off angle of each thyristor level and system are closed the angle of rupture;
(6) judge whether brachium pontis commutation failure occurs.
2. converter valve commutation failure method of discrimination as claimed in claim 1, is characterized in that, stray capacitance in described utility appliance damping circuit, the equal hydraulic circuit of direct current, thyristor, saturable reactor and valve; Form the equal hydraulic circuit of damping circuit-direct current-thyristor parallel branch after described damping circuit, the equal hydraulic circuit of direct current and thyristor parallel connection, the equal hydraulic circuit of damping circuit-direct current-thyristor parallel branch is connected in parallel with stray capacitance in valve with saturable reactor.
3. converter valve commutation failure method of discrimination as claimed in claim 1, is characterized in that, in described step (1), by measuring the turn-off time t of thyristor under different service conditions
q, obtain the corresponding turn-off time t of thyristor minimum turn-off angle
qdata and curves.
4. converter valve commutation failure method of discrimination as claimed in claim 1, is characterized in that, in described step (2), according to test figure, carries out multiple linear regression analysis matching t
qto the function of each operational factor, its expression formula is as follows:
Obtain formula<1 by Mathematical Fitting>in coefficient: β
0, β
1, β
2, β
3and β
4;
Each operational factor comprises: thyristor junction temperature T
j, the back-pressure V that bears of electric current rate of descent di/dt, turn off process
rr, on state current I
f.
5. converter valve commutation failure method of discrimination as claimed in claim 1, is characterized in that, in described step (3), utilizes test figure to carry out residual analysis to Regression Analysis Result, and residual analysis is for judging the fitting effect of multiple linear regression model.
6. converter valve commutation failure method of discrimination as claimed in claim 1, it is characterized in that, in described step (4), during the operating brachium pontis commutation of converter valve, each thyristor level in brachium pontis is carried out to operational parameter detection, obtain the minimum turn-off angle γ in each thyristor level actual motion
min;
Wherein, electric current rate of descent di/dt, the back-pressure V that turn off process bears
rr, on state current I
ftE plate by thyristor is measured, thyristor junction temperature T
jmeasure minimum turn-off angle γ by being embedded in the thyristor internal temperature sensor
minby following expression formula, meaned:
7. converter valve commutation failure method of discrimination as claimed in claim 6, is characterized in that, the converter valve brachium pontis is in series by valve module; Each valve module is in series with reactor; Described valve module consists of the thyristor of series connection, and the control utmost point and the negative electrode of each thyristor are connected with the gate pole unit, and each thyristor is parallel with resistance branch and resistance-capacitance branch road.
8. converter valve commutation failure method of discrimination as claimed in claim 1, is characterized in that, in described step (5), respectively by the γ of each thyristor level
minclose angle of rupture γ with system and compare, record γ
minthe thyristor progression N of<γ
cF, and calculate thyristor progression N
cFproportion k in whole brachium pontis
cF, expression formula is as follows:
Wherein: N
tfor brachium pontis series thyristor level sum.
9. converter valve commutation failure method of discrimination as claimed in claim 1, is characterized in that, in described step (6), and judgement thyristor progression N
cFproportion k in whole brachium pontis
cFwhether exceed 30%, if exceed 30%, judge the brachium pontis commutation failure; Otherwise, judge brachium pontis commutation success.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764991A (en) * | 2015-04-17 | 2015-07-08 | 孟异山 | Method for detecting running state of phase-changing circuit thyristor of high-voltage DC converter valve |
| CN105375504A (en) * | 2014-08-25 | 2016-03-02 | 国家电网公司 | Converter valve extinction angle prediction control method |
| CN105511293A (en) * | 2014-09-22 | 2016-04-20 | 国家电网公司 | Converter valve simulation platform and realization method thereof |
| CN105743115A (en) * | 2016-02-29 | 2016-07-06 | 全球能源互联网研究院 | Parallel defense and repair device and method for commutation failure fault of DC power transmission |
| CN105866602A (en) * | 2016-06-08 | 2016-08-17 | 全球能源互联网研究院 | High-voltage direct current power transformation converter valve phase change failure resistance device |
| CN107026464A (en) * | 2017-03-21 | 2017-08-08 | 全球能源互联网研究院 | A kind of optimization method of converter valve |
| CN105717383B (en) * | 2014-12-04 | 2018-10-23 | 国家电网公司 | The hot operating test device of the big component change current valve module of direct current transportation and its test method |
| CN109709423A (en) * | 2018-12-27 | 2019-05-03 | 清华大学 | A kind of measurement method of electric device commutation circuit stray parameter |
| CN110850210A (en) * | 2019-11-18 | 2020-02-28 | 全球能源互联网研究院有限公司 | Direct current transmission converter valve base electronic device and system |
| CN110850209A (en) * | 2019-11-15 | 2020-02-28 | 全球能源互联网研究院有限公司 | Monitoring control device and system for simulating commutation failure test |
| CN111555640A (en) * | 2020-03-31 | 2020-08-18 | 清华大学 | Control method of high-voltage direct-current transmission hybrid converter |
| CN113067360A (en) * | 2021-03-31 | 2021-07-02 | 全球能源互联网研究院有限公司 | Commutation failure suppression method and system for VSC-LCC hybrid direct current converter |
| CN105866602B (en) * | 2016-06-08 | 2024-07-09 | 全球能源互联网研究院 | Commutation failure defending device for high-voltage direct-current transmission converter valve |
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| CN105375504A (en) * | 2014-08-25 | 2016-03-02 | 国家电网公司 | Converter valve extinction angle prediction control method |
| CN105375504B (en) * | 2014-08-25 | 2018-03-16 | 国家电网公司 | A kind of converter valve blow-out angle forecast Control Algorithm |
| CN105511293A (en) * | 2014-09-22 | 2016-04-20 | 国家电网公司 | Converter valve simulation platform and realization method thereof |
| CN105511293B (en) * | 2014-09-22 | 2018-08-14 | 国家电网公司 | A kind of converter valve emulation platform and its implementation |
| CN105717383B (en) * | 2014-12-04 | 2018-10-23 | 国家电网公司 | The hot operating test device of the big component change current valve module of direct current transportation and its test method |
| CN104764991A (en) * | 2015-04-17 | 2015-07-08 | 孟异山 | Method for detecting running state of phase-changing circuit thyristor of high-voltage DC converter valve |
| CN104764991B (en) * | 2015-04-17 | 2018-01-19 | 孟异山 | A kind of high voltage direct current converter valve commutation circuit IGCT method for detecting operation state |
| CN105743115A (en) * | 2016-02-29 | 2016-07-06 | 全球能源互联网研究院 | Parallel defense and repair device and method for commutation failure fault of DC power transmission |
| CN105743115B (en) * | 2016-02-29 | 2024-03-22 | 全球能源互联网研究院 | Parallel connection defense and repair device and method for commutation failure fault of direct-current transmission |
| CN105866602A (en) * | 2016-06-08 | 2016-08-17 | 全球能源互联网研究院 | High-voltage direct current power transformation converter valve phase change failure resistance device |
| CN105866602B (en) * | 2016-06-08 | 2024-07-09 | 全球能源互联网研究院 | Commutation failure defending device for high-voltage direct-current transmission converter valve |
| CN107026464B (en) * | 2017-03-21 | 2021-09-03 | 全球能源互联网研究院 | Optimization method of converter valve |
| CN107026464A (en) * | 2017-03-21 | 2017-08-08 | 全球能源互联网研究院 | A kind of optimization method of converter valve |
| CN109709423A (en) * | 2018-12-27 | 2019-05-03 | 清华大学 | A kind of measurement method of electric device commutation circuit stray parameter |
| CN110850209A (en) * | 2019-11-15 | 2020-02-28 | 全球能源互联网研究院有限公司 | Monitoring control device and system for simulating commutation failure test |
| CN110850210A (en) * | 2019-11-18 | 2020-02-28 | 全球能源互联网研究院有限公司 | Direct current transmission converter valve base electronic device and system |
| CN110850210B (en) * | 2019-11-18 | 2022-03-04 | 全球能源互联网研究院有限公司 | Direct current transmission converter valve base electronic device and system |
| CN111555640A (en) * | 2020-03-31 | 2020-08-18 | 清华大学 | Control method of high-voltage direct-current transmission hybrid converter |
| CN113067360A (en) * | 2021-03-31 | 2021-07-02 | 全球能源互联网研究院有限公司 | Commutation failure suppression method and system for VSC-LCC hybrid direct current converter |
| CN113067360B (en) * | 2021-03-31 | 2022-12-06 | 全球能源互联网研究院有限公司 | Commutation failure suppression method and system for VSC-LCC hybrid direct current converter |
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| CN103487680B (en) | 2016-01-20 |
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