CN107769173B - A kind of definite value choosing method of flexible direct current power transmission system bridge arm overcurrent protection - Google Patents
A kind of definite value choosing method of flexible direct current power transmission system bridge arm overcurrent protection Download PDFInfo
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- CN107769173B CN107769173B CN201711117492.2A CN201711117492A CN107769173B CN 107769173 B CN107769173 B CN 107769173B CN 201711117492 A CN201711117492 A CN 201711117492A CN 107769173 B CN107769173 B CN 107769173B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The present invention relates to a kind of definite value choosing methods of flexible direct current power transmission system bridge arm overcurrent protection; the present situation of shortage unified approach is chosen for the definite value of the bridge arm overcurrent protection in flexible direct current power transmission system direct current protecting device; if the bridge arm overcurrent function in selected definite value and valve arrangement mismatches, direct current protecting error action of device or tripping can be caused.Therefore, the present invention on current time figure by drawing valve arrangementC IPoint withC IIThe broken line and direct current protecting device of pointP IPoint、 P IIPoint、 P IIIPoint andP IVThe broken line of point, by judging whether definite value matches with the presence or absence of crosspoint between two broken lines, and by adjustingP IPoint、 P IIPoint、 P IIIPoint andP IVThe current value and time value of point carry out come the method for eliminating crosspointP IPoint、 P IIPoint、 P IIIPoint andP IVThe definite value of point is chosen.The present invention can effectively prevent the malfunction under external AC fault of direct current protecting device, while can also prevent its tripping under DC Line Fault, be suitable for Power System Flexible direct current transportation relay protection constant value calculating field.
Description
Technical field
The present invention relates to protecting electrical power system fixed value calculation analysis fields, more particularly, to a kind of flexible DC power transmission
The definite value choosing method of system bridge arm overcurrent protection.
Background technology
Flexible DC transmission technology is a kind of voltage source converter type HVDC Transmission Technology based on wholly-controled device.Especially
It is grid-connected suitable for regenerative resource, distributed power generation is grid-connected, the power supply of island with power, urban distribution network, Asynchronous Communication Power System Interconnection etc.
Field.
Beam lack China et al. " flexible direct current power transmission system control protection scheme " (Automation of Electric Systems, 2013,37
(15), 59~65) and " circulation Analysis on Mechanism inside modular multilevel converter type direct current transmission " (high electricity of Tu Qingrui et al.
Pressure technology, 2010,36 (2), 547~552) describe typical flexible direct current transmission control protection system framework, by level by
It is low to high, it is broadly divided into three valve control system, converter Control system and station level control system levels.Direct current protecting device conduct
One independent device configuration, individually undertakes defencive function.
The bridge arm current of flexible DC power transmission flows through power electronic devices, occurs inside or outside flexible direct current system
Failure when bridge arm current increases and is more than device permissible value, for protection device safety, should be acted by bridge arm overcurrent protection function,
It is latched transverter, isolated fault.It detects bridge arm overcurrent and is latched the function of transverter in valve control system and direct current protecting device
In have configuration.
Bridge arm overcurrent protection function in valve control is typically provided with two, i.e. CIPoint and CIIPoint.CIPoint outlet logic is forever
It is latched transverter long and jumps AC circuit breaker.CIIPoint is standby point, is delayed one section of long period, and outlet logic is also that locking is changed
Stream device simultaneously jumps AC circuit breaker.CIThe basis for estimation of point is bridge arm current instantaneous value, CIIThe basis for estimation of point is bridge arm current
Virtual value.CIPoint and CIIThe current value and time value of point are generally pre-set in manufacture by converter valve equipment manufacturer, after
It is continuous to immobilize.
Four bridge arm overcurrent protections, i.e. P are also configured in direct current protecting deviceIPoint, PIIPoint, PIIIPoint and PIVPoint.PIPoint
Basis for estimation is current instantaneous value, and outlet logic jumps outside AC circuit breaker in addition to being latched transverter, further includes triggering submodule
Bypass thyristor.PIIPoint, PIIIPoint and PIVThe basis for estimation of point is current effective value, and outlet logic is only to be latched transverter and jump
AC circuit breaker.
There is presently no specific direct current protecting device bridge arm overcurrent protection PIPoint, PIIPoint, PIIIPoint and PIVThe definite value choosing of point
Take method (including current value and time value).If PIPoint, PIIPoint, PIIIPoint and PIVIt is improper that the definite value of point is chosen, with valve arrangement
Middle CIPoint and CIIThe definite value of point mismatches, and will lead to direct current protecting malfunction or tripping, causes flexible direct current power transmission system unplanned
It stops transport.
Invention content
Technology during being chosen the present invention overcomes above-mentioned existing flexible DC power transmission bridge arm overcurrent protection definite value lacks
It falls into, provides a kind of definite value choosing method of new flexible direct current power transmission system bridge arm overcurrent protection, direct current protecting can be prevented
Bridge arm overcurrent protection malfunction under external AC fault in device, and its tripping under DC Line Fault can be prevented.
A kind of definite value choosing method of flexible direct current power transmission system bridge arm overcurrent protection, includes the following steps：
S1. pass through the DC current rated value of converter transformer valve-side rated current virtual value and flexible direct current power transmission system
Calculate the reference value I of bridge arm current instantaneous valuen_instWith the reference value I of bridge arm current virtual valuen_rms；
S2. current time figure is drawn, the current time figure is using the time as independent variable, using electric current as dependent variable；It will change
The C of bridge arm overcurrent protection in the valve arrangement of Liu Fa manufacturers settingIPoint and CIIPoint current value and time value are according to current value
Perunit value be labeled in the current time figure；
S3. the P of direct current protecting device bridge arm overcurrent protection is setIPoint, PIIPoint, PIIIPoint and PIVPoint current value and when
Between be worth；By PIThe perunit value for pressing instantaneous value is labeled in the current time figure, PIIPoint, PIIIPoint and PIVPress virtual value
Perunit value be labeled in the current time figure；
S4. on the current time figure C is connected with broken lineIPoint and CIIPoint obtains the bridge arm overcurrent work(of valve arrangement
The protection domain of energy, the connection CIPoint and CIIPoint the broken line technique of painting be：CIThe horizontal extension line and C of pointIIThe vertical of point is prolonged
Stretching line, there are intersection point X0, by CIPoint and X0Point makees straight line l1Connection, by X0Point is in CIIPoint makees straight line l2Connection, the straight line l1With
Straight line l2Composition connection CIPoint and CIIThe broken line of point；
S5. on the current time figure P is connected with broken lineIPoint, PIIPoint, PIIIPoint and PIVPoint obtains direct current protecting dress
The bridge arm overcurrent protection curve set, the connection PIPoint, PIIPoint, PIIIPoint and PIVPoint the broken line technique of painting be：Adjacent each two point
The broken line technique of painting and CIPoint and CIIThe broken line technique of painting of point is identical；
S6. judge the bridge arm overcurrent protection curve of direct current protecting device and connect CIPoint and CIIWhether the broken line of point has friendship
Point；If there is intersection point, P is adjustedIPoint, PIIPoint, PIIIPoint and PIVThe current value and time value of point, make it meet instantaneous value definite value about
Beam condition and virtual value definite value constraints, and return to S5；If without intersection point, enter S7；
S7. the bridge arm overcurrent protection P of direct current protecting device is obtainedIPoint, PIIPoint, PIIIPoint and PIVThe current value of point and time
Value.
In a kind of preferred scheme, the I in the S1n_instAnd In_rmsIt is calculated by following formula：
In formula, IvnFor the virtual value of converter transformer valve-side rated current, IdcnFor the direct current of flexible direct current power transmission system
Flow rated value.
In a kind of preferred scheme, P is adjusted in the S6IPoint, PIIPoint, PIIIPoint and PIVThe current value of point and time
Value includes the following contents：
Increase or reduce PIPoint, PIIPoint, PIIIPoint and PIVThe current value of point；
Increase or reduce PIPoint, PIIPoint, PIIIPoint and PIVThe time value of point.
In a kind of preferred scheme, the instantaneous value definite value constraints in the S6 includes the following contents：
I (C in formulaI) it is the valve arrangement bridge arm overcurrent protection C that converter valve manufacturer setsIThe current value of point；t(CI)
For the valve arrangement bridge arm overcurrent protection C of converter valve manufacturer settingIThe time value of point；I(PI) it is direct current protecting device jackshaft
Arm overcurrent protection PIThe current value of point, t (PI) it is direct current protecting device bridge arm overcurrent protection PIThe time value of point.
In a kind of preferred scheme, the virtual value definite value constraints in the S6 includes the following contents：
I (C in formulaII) it is the valve arrangement bridge arm overcurrent protection C that converter valve manufacturer setsIIThe current value of point；t
(CII) it is the valve arrangement bridge arm overcurrent protection C that converter valve manufacturer setsIIThe time value of point；I(PII)、I(PIII) and I
(PIV) be respectively direct current protecting device bridge arm overcurrent protection PIIPoint, PIIIPoint and PIVThe current value of point, t (PII)、t(PIII)
With t (PIV) be respectively direct current protecting device bridge arm overcurrent protection PIIPoint, PIIIPoint and PIVThe time value of point.
Compared with prior art, the advantageous effect of technical solution of the present invention is：
By choosing bridge arm overcurrent protection definite value (the i.e. P in direct current protecting deviceI、PII、PIIIAnd PIVPoint current value and
Time value), it can be effectively prevent the malfunction under external AC fault of direct current protecting device, while can also prevent it under DC Line Fault
Tripping improves the operational reliability of flexible direct current power transmission system.
Description of the drawings
Fig. 1 is the method flow diagram of embodiment.
Fig. 2 is current time figure when embodiment protection domain intersects.
Fig. 3 is current time figure when embodiment protection domain does not intersect.
Specific implementation mode
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；
To those skilled in the art, it is to be appreciated that certain known features and its explanation, which may be omitted, in attached drawing
's.
The following further describes the technical solution of the present invention with reference to the accompanying drawings and examples.
As shown in Figure 1, a kind of definite value choosing method of flexible direct current power transmission system bridge arm overcurrent protection, including walk as follows
Suddenly：
S1. the reference value I of bridge arm current instantaneous value is calculatedn_instWith the reference value I of bridge arm current virtual valuen_rms：By changing
Convertor transformer valve side rated current virtual value IvnWith the DC current rated value I of flexible direct current power transmission systemdcnCalculate bridge arm current
The reference value I of instantaneous valuen_instWith the reference value I of bridge arm current virtual valuen_rms, In_instAnd In_rmsIt is carried out by following formula
It calculates：
S2. current time figure is drawn, by CIPoint and CIIPoint is labeled in current time figure：Current time figure is certainly with the time
Variable, using electric current as dependent variable；The C of bridge arm overcurrent protection in the valve arrangement that converter valve manufacturer is setIPoint and CIIPoint
Current value and time value are labeled according to the perunit value of current value in current time figure.
S3. by PIPoint, PIIPoint, PIIIPoint and PIVPoint is labeled in current time figure：Set direct current protecting device bridge arm mistake
Flow the P of protectionIPoint, PIIPoint, PIIIPoint and PIVThe current value and time value of point；By PIThe perunit value of the instantaneous value of point is labeled in electricity
It flows in time diagram, PIIPoint, PIIIPoint and PIVThe perunit value of the virtual value of point is labeled in current time figure.
S4. on current time figure C is connected with broken lineIPoint and CIIPoint constitutes the bridge arm overcurrent protection of direct current protecting device
Curve.Connect CIPoint and CIIPoint the broken line technique of painting be：CIThe horizontal extension line and C of pointIIThere are intersection point X for the line that extends vertically of point0,
By CIPoint and X0Point makees straight line l1Connection, by X0Point and CIIPoint makees straight line l2Connection, straight line l1With straight line l2Composition connection CIPoint and
CIIThe broken line of point.
S5. on current time figure P is connected with broken lineIPoint, PIIPoint, PIIIPoint and PIVPoint：Connect PIPoint, PIIPoint, PIIIPoint
And PIVPoint the broken line technique of painting be：The broken line technique of painting and C of adjacent each two pointIPoint and CIIThe broken line technique of painting of point is identical.
S6. judge the bridge arm overcurrent protection curve of direct current protecting device and connect CIPoint and CIIWhether the broken line of point has friendship
Point：
If there is intersection point, as shown in Fig. 2, increasing or reducing PIPoint, PIIPoint, PIIIPoint and PIVThe current value of point and time
Value, makes it meet instantaneous value definite value constraints and virtual value definite value constraints, and return to S5；
Instantaneous value definite value constraints content is as follows：
I (C in formulaI) it is the valve arrangement bridge arm overcurrent protection C that converter valve manufacturer setsIThe current value of point；t(CI)
For the valve arrangement bridge arm overcurrent protection C of converter valve manufacturer settingIThe time value of point；I(PI) it is direct current protecting device jackshaft
Arm overcurrent protection PIThe current value of point, t (PI) it is direct current protecting device bridge arm overcurrent protection PIThe time value of point；
Virtual value definite value constraints content is as follows：
I (C in formulaII) it is the valve arrangement bridge arm overcurrent protection C that converter valve manufacturer setsIIThe current value of point；t
(CII) it is the valve arrangement bridge arm overcurrent protection C that converter valve manufacturer setsIIThe time value of point；I(PII)、I(PIII) and I
(PIV) be respectively direct current protecting device bridge arm overcurrent protection PIIPoint, PIIIPoint and PIVThe current value of point, t (PII)、t(PIII)
With t (PIV) be respectively direct current protecting device bridge arm overcurrent protection PIIPoint, PIIIPoint and PIVThe time value of point；
If without intersection point, as shown in figure 3, entering S7.
S7. the bridge arm overcurrent protection P of direct current protecting device is obtainedIPoint, PIIPoint, PIIIPoint and PIVThe current value of point and time
Value.
The terms describing the positional relationship in the drawings are only for illustration, should not be understood as the limitation to this patent；
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
All any modification, equivalent and improvement etc., should be included in the claims in the present invention made by within the spirit and principle of invention
Protection domain within.
Claims (3)
1. a kind of definite value choosing method of flexible direct current power transmission system bridge arm overcurrent protection, which is characterized in that include the following steps：
S1. it is calculated by converter transformer valve-side rated current virtual value and the DC current rated value of flexible direct current power transmission system
The reference value I of bridge arm current instantaneous valuen_instWith the reference value I of bridge arm current virtual valuen_rms；
S2. current time figure is drawn, the current time figure is using the time as independent variable, using electric current as dependent variable；By converter valve
The C of bridge arm overcurrent protection in the valve arrangement of manufacturer's settingIPoint and CIIPut the mark of current value and time value according to current value
One value is labeled in the current time figure；
S3. the P of direct current protecting device bridge arm overcurrent protection is setIPoint, PIIPoint, PIIIPoint and PIVThe current value and time value of point；
By PIThe perunit value for pressing instantaneous value is labeled in the current time figure, PIIPoint, PIIIPoint and PIVPress the perunit of virtual value
Value is labeled in the current time figure；
S4. on the current time figure C is connected with broken lineIPoint and CIIPoint obtains the bridge arm overcurrent protection work(of valve arrangement
The protection domain of energy, the connection CIPoint and CIIPoint the broken line technique of painting be：CIThe horizontal extension line and C of pointIIThe vertical of point is prolonged
Stretching line, there are intersection point X0, by CIPoint and X0Point makees straight line l1Connection, by X0Point and CIIPoint makees straight line l2Connection, the straight line l1With
Straight line l2Composition connection CIPoint and CIIThe broken line of point；
S5. on the current time figure P is connected with broken lineIPoint, PIIPoint, PIIIPoint and PIVPoint obtains direct current protecting device
Bridge arm overcurrent protection curve, the connection PIPoint, PIIPoint, PIIIPoint and PIVPoint the broken line technique of painting be：The folding of adjacent each two point
Line drawing method and CIPoint and CIIThe broken line technique of painting of point is identical；
S6. judge the bridge arm overcurrent protection curve of direct current protecting device and connect CIPoint and CIIWhether the broken line of point has intersection point；If
There is intersection point, then adjusts PIPoint, PIIPoint, PIIIPoint and PIVThe current value and time value of point, make it meet instantaneous value definite value constraints
With virtual value definite value constraints, and S5 is returned to；If without intersection point, enter S7；
S7. the bridge arm overcurrent protection P of direct current protecting device is obtainedIPoint, PIIPoint, PIIIPoint and PIVThe current value and time value of point；
Wherein, the instantaneous value definite value constraints in the S6 includes the following contents：
I (C in formulaI) it is the valve arrangement bridge arm overcurrent protection C that converter valve manufacturer setsIThe current value of point；t(CI) it is to change
The valve arrangement bridge arm overcurrent protection C of Liu Fa manufacturers settingIThe time value of point；I(PI) it is direct current protecting device bridge arm mistake
Stream protection PIThe current value of point, t (PI) it is direct current protecting device bridge arm overcurrent protection PIThe time value of point；
Wherein, the virtual value definite value constraints in the S6 includes the following contents：
I (C in formulaII) it is the valve arrangement bridge arm overcurrent protection C that converter valve manufacturer setsIIThe current value of point；t(CII) be
The valve arrangement bridge arm overcurrent protection C of converter valve manufacturer settingIIThe time value of point；I(PII)、I(PIII) and I (PIV) respectively
For the P of direct current protecting device bridge arm overcurrent protectionIIPoint, PIIIPoint and PIVThe current value of point, t (PII)、t(PIII) and t (PIV) point
Not Wei direct current protecting device bridge arm overcurrent protection PIIPoint, PIIIPoint and PIVThe time value of point.
2. definite value choosing method according to claim 1, which is characterized in that the I in the S1n_instAnd In_rmsPass through
Following formula is calculated：
In formula, IvnFor converter transformer valve-side rated current virtual value, IdcnIt is specified for the DC current of flexible direct current power transmission system
Value.
3. definite value choosing method according to claim 1 or 2, which is characterized in that adjust P in the S6IPoint, PIIPoint,
PIIIPoint and PIVThe current value and time value of point include the following contents：
Increase or reduce PIPoint, PIIPoint, PIIIPoint and PIVThe current value of point；
Increase or reduce PIPoint, PIIPoint, PIIIPoint and PIVThe time value of point.
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| CN201711117492.2A CN107769173B (en) | 2017-11-13 | 2017-11-13 | A kind of definite value choosing method of flexible direct current power transmission system bridge arm overcurrent protection |
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| CN107769173B true CN107769173B (en) | 2018-09-11 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101752839A (en) * | 2010-02-02 | 2010-06-23 | 南方电网技术研究中心 | Method for improving valve short circuit protection and setting performance of current converter |
| JP2011078228A (en) * | 2009-09-30 | 2011-04-14 | Minebea Co Ltd | Overcurrent protection circuit |
| CN104636602A (en) * | 2015-01-15 | 2015-05-20 | 国网上海市电力公司 | Definite value curve automatic drawing method |
| CN106485025A (en) * | 2016-11-01 | 2017-03-08 | 南方电网科学研究院有限责任公司 | A kind of check method of direct current protecting definite value |
| CN106936150A (en) * | 2015-12-30 | 2017-07-07 | 中国电力科学研究院 | A kind of parameter optimization collocation method of modular multilevel DC transmission system |
| CN106992500A (en) * | 2017-05-02 | 2017-07-28 | 许继集团有限公司 | The bridge arm current over-current protection method and control system of flexible direct current power transmission system |
-
2017
- 2017-11-13 CN CN201711117492.2A patent/CN107769173B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011078228A (en) * | 2009-09-30 | 2011-04-14 | Minebea Co Ltd | Overcurrent protection circuit |
| CN101752839A (en) * | 2010-02-02 | 2010-06-23 | 南方电网技术研究中心 | Method for improving valve short circuit protection and setting performance of current converter |
| CN104636602A (en) * | 2015-01-15 | 2015-05-20 | 国网上海市电力公司 | Definite value curve automatic drawing method |
| CN106936150A (en) * | 2015-12-30 | 2017-07-07 | 中国电力科学研究院 | A kind of parameter optimization collocation method of modular multilevel DC transmission system |
| CN106485025A (en) * | 2016-11-01 | 2017-03-08 | 南方电网科学研究院有限责任公司 | A kind of check method of direct current protecting definite value |
| CN106992500A (en) * | 2017-05-02 | 2017-07-28 | 许继集团有限公司 | The bridge arm current over-current protection method and control system of flexible direct current power transmission system |
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