CN101599645A - A kind of method that prevents the overvoltage of HVDC (High Voltage Direct Current) transmission system inversion-side reverse polar wire - Google Patents
A kind of method that prevents the overvoltage of HVDC (High Voltage Direct Current) transmission system inversion-side reverse polar wire Download PDFInfo
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- CN101599645A CN101599645A CNA200910135861XA CN200910135861A CN101599645A CN 101599645 A CN101599645 A CN 101599645A CN A200910135861X A CNA200910135861X A CN A200910135861XA CN 200910135861 A CN200910135861 A CN 200910135861A CN 101599645 A CN101599645 A CN 101599645A
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Abstract
A kind of method that prevents the overvoltage of HVDC (High Voltage Direct Current) transmission system inversion-side reverse polar wire, this method is by taking specific control mode to the trigger impulse of inversion side control system, trigger impulse is matched with the sequential that inversion side converter transformer exchanges service entrance switch, thereby reach the effect that prevents the reverse overvoltage of inversion side pole line.More specifically, when the inversion side converter valve of DC transmission system was thrown bypass to locking, when the direct-current polar reverse voltage surpassed set point, control system was sent and is thrown bypass to blocking order, prevents the further rising of direct-current polar reverse voltage.
Description
Technical field
The present invention relates to a kind of method that prevents the overvoltage of HVDC (High Voltage Direct Current) transmission system inversion-side reverse polar wire, when using this method can avoid the DC transmission system locking, higher inverse overvoltage appears in the inversion side, causes the insulation damages of inversion side electric equipment.This method improvement the locking sequential the during locking of DC transmission system inversion side, and in conjunction with the actual measurement dc voltage value, and relatively with the direction voltage permissible value of this magnitude of voltage and setting, thereby stop to throw the right time of bypass the reverse polar wire overvoltage when effectively having avoided the locking of DC transmission system inversion side when judging the locking of inversion side reliably.
Background technology
When DC transmission system is normally moved, the direct voltage potential difference of rectification side and inversion side has determined the throughput direction of direct current power, when DC transmission system under normal circumstances or locking is stopped transport under the failure condition, the rectification side is generally by spending trigger angle phase shift to 164, the trigger impulse of locking converter valve then, and the interchange service entrance switch that the change of current of rectification side is become draws back.The inversion side generally drops into bypass when locking right, shown in accompanying drawing one, 1,4,2,5,3,6 can to elect bypass as right, drop into bypass to after, to sending trigger impulse all the time, according to the conducting principle of thyristor, thyristor can conducting when having trigger impulse and positive pressurization to bypass for control system, therefore, after the locking of rectification side, for the inversion side, be equivalent to the open circuit of inversion side thyristor, drop into bypass in the inversion side and can cause inversion side thyristor valve reverse voltage to occur back peak value rectification owing to valve, if this reverse overvoltage is not suppressed, will cause the damage of converter valve equipment.Therefore, in control system, must take appropriate measures avoid DC transmission system inversion side after the locking of rectification side throw bypass to the time inverse overvoltage that causes.
Summary of the invention
The objective of the invention is to propose a kind of method that prevents the overvoltage of high voltage direct current transmission inversion-side reverse polar wire.This method makes trigger impulse and inversion side converter transformer switch possess certain matching timing, thereby reaches the effect that prevents the reverse overvoltage of inversion side pole line by inversion side trigger impulse is taked special control mode.
Fig. 1 is a high voltage direct current transmission inversion side schematic diagram, and wherein Ud is a direct-current polar voltage, and K is that the change of current becomes lead-in circuit breaker, and L is that the change of current becomes equivalent reactance, and Ud is greater than 0 under the normal running conditions.During the locking of inversion side, it is right generally will to throw bypass, as 1 valve among Fig. 2 and 4 valves.If the inversion side is thrown bypass the mishandling meeting in back is caused the very harmful reverse overvoltage of direct-current polar Ud, is analyzed as follows:
The inversion side is thrown bypass to valve 1, valve 4, i.e. expression continues valve 1, valve 4 are applied trigger impulse.At the positive half wave of eai, valve 1 might conducting, and eai will be to the stray capacitance charging in parallel with valve 1, because the unidirectional conduction (being that the valve electric current can only flow to negative electrode from anode) of valve, capacitance voltage is with unidirectional growth, up to the amplitude A that reaches eai, i.e. Ud2=-A.In like manner, at the negative half-wave of eai, valve 4 possible conductings, its stray capacitance voltage in parallel also will be charged to A, i.e. Ud1=-A, then polar curve voltage U d=Ud1+Ud2=-2A.The big or small 2A of this reverse voltage is suitable with the rated voltage of direct current system.Polar curve voltage snap back to high numerical value like this can make valve bear big stress, also can damage threshold when serious.Therefore should manage to avoid the reverse voltage of polar curve.
During the locking of inversion side, exchange service entrance switch K except throwing bypass to also jumping, to isolate AC power.Notice that the polar curve reverse voltage pair causes with AC power jointly by throwing bypass, therefore can avoid polar curve reverse overvoltage prior to throwing bypass to disconnecting to making alternating-current switch as long as bypass is thrown in time-delay.
Description of drawings
Fig. 1 is a high voltage direct current transmission inversion side schematic diagram, and wherein Ud is a direct-current polar voltage, and K is that the change of current becomes lead-in circuit breaker, and L is that the change of current becomes equivalent reactance.
Fig. 2 be high voltage direct current transmission inversion side throw bypass to the time schematic diagram, wherein Ud is a direct-current polar voltage, K is that the change of current becomes lead-in circuit breaker, L is that the change of current becomes equivalent reactance, 1 valve wherein and 4 valves are that the bypass selected of control system is right.
Embodiment
For avoiding the inverse overvoltage of inversion side direct-current polar, can take to delay time and throw the right locking strategy of bypass, embodiment is:
1. after inversion side starts the action of locking converter, send and jump the instruction that exchanges service entrance switch K.
2.100ms sending, back inversion side throws the right instruction of bypass.Usually the incident that exchanges the service entrance switch tripping is 40ms, so the inversion side sends when throwing bypass to instruction and exchange service entrance switch tripping, and AC power is isolated.
3. be insurance meter, monitor direct-current polar voltage simultaneously, when it sends the 10ms bypass to blocking order when oppositely value is greater than reference value, the polar curve reverse voltage when preventing to exchange service entrance switch not by tripping.
4. throw bypass to 2s, back locking trigger impulse is finished whole locking sequential of converter.
Claims (2)
1, a kind of method that prevents the overvoltage of HVDC (High Voltage Direct Current) transmission system inversion-side reverse polar wire, it is characterized in that: by the trigger impulse of inversion side control system is taked specific control mode, trigger impulse is matched with the sequential that inversion side converter transformer exchanges service entrance switch, thereby reach the effect that prevents the reverse overvoltage of inversion side pole line.
2, specific control mode as claimed in claim 1, it is characterized in that: when inversion side converter valve is thrown bypass to locking, when the direct-current polar reverse voltage surpassed set point, control system was sent and is thrown bypass to blocking order, prevents the further rising of direct-current polar reverse voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200910135861XA CN101599645A (en) | 2009-04-30 | 2009-04-30 | A kind of method that prevents the overvoltage of HVDC (High Voltage Direct Current) transmission system inversion-side reverse polar wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200910135861XA CN101599645A (en) | 2009-04-30 | 2009-04-30 | A kind of method that prevents the overvoltage of HVDC (High Voltage Direct Current) transmission system inversion-side reverse polar wire |
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| Publication Number | Publication Date |
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| CN101599645A true CN101599645A (en) | 2009-12-09 |
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| CNA200910135861XA Pending CN101599645A (en) | 2009-04-30 | 2009-04-30 | A kind of method that prevents the overvoltage of HVDC (High Voltage Direct Current) transmission system inversion-side reverse polar wire |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066557A (en) * | 2012-12-10 | 2013-04-24 | 国网智能电网研究院 | Modular multi-level flexible direct current system direct current fault overvoltage restraining method |
| CN103490439A (en) * | 2013-06-17 | 2014-01-01 | 许继电气股份有限公司 | Control method using valve control system to carry out reversed recovery-stage protection on thyristor |
| CN103618331B (en) * | 2013-11-27 | 2016-01-20 | 南方电网科学研究院有限责任公司 | A kind of flexible direct current transmission converter station DC over-voltage Current limited Control method |
| CN105490576A (en) * | 2014-10-13 | 2016-04-13 | 国家电网公司 | Pre-trigger mechanism based commutation failure control method for converter valve |
-
2009
- 2009-04-30 CN CNA200910135861XA patent/CN101599645A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066557A (en) * | 2012-12-10 | 2013-04-24 | 国网智能电网研究院 | Modular multi-level flexible direct current system direct current fault overvoltage restraining method |
| CN103066557B (en) * | 2012-12-10 | 2015-06-24 | 国网智能电网研究院 | Modular multi-level flexible direct current system direct current fault overvoltage restraining method |
| CN103490439A (en) * | 2013-06-17 | 2014-01-01 | 许继电气股份有限公司 | Control method using valve control system to carry out reversed recovery-stage protection on thyristor |
| CN103490439B (en) * | 2013-06-17 | 2016-01-20 | 许继电气股份有限公司 | A kind of valve control system is to the control method of thyristor recovery protection firing |
| CN103618331B (en) * | 2013-11-27 | 2016-01-20 | 南方电网科学研究院有限责任公司 | A kind of flexible direct current transmission converter station DC over-voltage Current limited Control method |
| CN105490576A (en) * | 2014-10-13 | 2016-04-13 | 国家电网公司 | Pre-trigger mechanism based commutation failure control method for converter valve |
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Open date: 20091209 |