CN103490439A - Control method using valve control system to carry out reversed recovery-stage protection on thyristor - Google Patents
Control method using valve control system to carry out reversed recovery-stage protection on thyristor Download PDFInfo
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- CN103490439A CN103490439A CN201310238780.9A CN201310238780A CN103490439A CN 103490439 A CN103490439 A CN 103490439A CN 201310238780 A CN201310238780 A CN 201310238780A CN 103490439 A CN103490439 A CN 103490439A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- 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 invention relates to a control method using a valve control system to carry out reversed recovery-stage protection on a thyristor and belongs to the technical field of high-voltage DC transmission of an electric system. According to the control method, the startup range of a reversed recovery stage of the thyristor is controlled by adding logical judgment conditions, and consequently the condition that the protection function of the thyristor in the reversed recovery stage can be controlled under different working conditions is achieved. The control method ensures that the protection functions of the valve control system in an original reversed recovery stage is not influenced, and the situation that reversed recovery-stage protection actions of the thyristor in the reversed recovery stage cause failure of a bypass pair or generation of excessive current under some special working conditions is also avoided. Consequently, the purpose that the valve control system can control and optimize the protection functions of the thyristor in the reversed recovery stage is achieved.
Description
Technical field
The present invention relates to the control method of a kind of valve control system to the thyristor recovery protection firing, belong to electric power system high voltage dc transmission technology field.
Background technology
In high voltage direct current transmission, safety, stable operation that recovery protection firing triggers for converter valve and even whole current conversion station system have a very important role.
Equipment fault in current conversion station or certain operations may cause converter valve to be closed in the very short time of having no progeny, and occur that at the thyristor two ends very steep forward transient voltage, the high voltage of this transient state forward may cause that the thyristor pressure punctures and damages.This be because, can bear forward blocking voltage after the thyristor reliable turn-off, it is very high that it bears the reverse recovery ability, and in reverse recovery, due to the existence of reverse recovery electric charge, the reverse recovery ability to bear of thyristor greatly reduces, and abroad it is generally acknowledged in 50V/ μ s left and right.
In HVDC (High Voltage Direct Current) transmission system, each thyristor has 1 gate pole plate, and valve control system is realized the triggering of thyristor is controlled by the gate pole plate.Under the control of valve control system, when thyristor turn-offs, when the transient forward voltage that two ends occur surpasses threshold value, the gate pole plate will trigger thyristor, make it normally, to avoid the destroyed property of thyristor, puncture, and the gate pole plate returns to 1 signal to valve control system simultaneously.When this situation appears in a plurality of thyristor levels in a single valve, the overvoltage that can cause other thyristor levels is arranged, therefore, valve control system can, according to the signal of return, be controlled and trigger whole single valve.
In the valve control system of operation now, each cycle of converter valve thyristor is closed and has no progeny, valve control system does not all have the startup recovery protection firing function of distinguishing, and at some in particular cases, the transient state disturbance meeting of system causes the possibility of false triggering.When as converter valve, carrying out locking or throwing the bypass operation; according to controlling sequential; control system can be selected a pair of by-pass valve conducting, if this constantly just in time other single valves due to anti-phase convalescence protection, triggering and conducting may cause to the device security of whole direct current system very large harm.As shown in Figure 3, be DC converter valve major loop wiring schematic diagram.Wherein A, B, C mean respectively the AC network three-phase circuit, and T1 means converter transformer, and V1-V6 means respectively 6 single valves of converter valve.Each single valve is formed by some Thyristors in series.Each thyristor in single valve is connected with valve control system by optical fiber respectively, receives the control & monitor of valve control system.The conducting of converter valve is sequentially arrived V6 for V1, each single valve conducting 120 degree electrical degree.At the inversion end, after completing the commutation of a single valve, as by V2, V3 conducting commutation to V3, V4 conducting.Thyristor is in turn off process, and electric current, from rated value drops to zero, just possesses the ability of bearing reverse voltage.Due to the existence of thyristor electric capacity, need certain reverse recovery electric charge, make reverse flow after current over-zero, this process is called reverse recovery.During this, there is the charge carrier that is called as recovery charge in thyristor.The intensity of charge carrier determines by the voltage change ratio du/dt at thyristor two ends, and too high du/dt can cause the instantaneous swift and violent increase of charge carrier intensity, and the PN junction of thyristor has little time to evacuate these charge carriers, likely causes local overheating and damages.If disturbance occurs in reverse recovery, as ac grid voltage fluctuation, commutation failure, lightning impulse etc., all likely cause du/dt excessive, therefore must add the reverse recovery trigger protection to thyristor.
When the system locking, the inversion end can be thrown bypass to consume the direct current bus bar energy.As while conducting V1 and V4 achieve the goal to form short circuit.If now other single valves are owing to being subject to the recovery protection firing conducting that is triggered, likely can make to throw the bypass failure.If exchange the cover tube voltage in peak value, likely form super-high-current.Due to throw bypass to after can consume rapidly the DC bus electric energy, can weaken the surge voltage of the reverse recovery of other single valves.So, now should stop the recovery protection firing of thyristor.
Summary of the invention
The purpose of this invention is to provide the control method of a kind of valve control system to the thyristor recovery protection firing; start the recovery protection firing function with the valve control system that solves existing operation owing to not distinguishing; make in particular cases, the transient state disturbance of system causes without the problem of setting out.
The present invention provides the control method of a kind of valve control system to the thyristor recovery protection firing for solving the problems of the technologies described above, and the step of this control method is as follows:
1) according to the operating mode of valve control system, the recovery protection firing of valve control system is triggered and is divided into normal mode and special pattern, described special pattern refers to when converter valve is carried out locking or thrown the bypass operation, the false triggering that the valve control system in the reverse recovery and protection phase causes converter valve;
Whether the recovery protection firing that 2) judges valve control system triggers in special pattern, if not in special pattern, by normal sequential, carries out recovery protection firing startup, triggering and shutoff;
3), if in special pattern, judge whether converter valve enters reverse recovery;
4) if converter valve enters reverse recovery, by valve control system, to the gate pole plate, send recovery protection firing and trigger the shutoff pulse, otherwise, forbid sending the recovery protection firing starting impulse to the gate pole plate.
Described valve control system carrys out the running status of control gate pole plate by the transmitted signal, to realize controlling the function of converter valve thyristor conducting and shutoff.
Pulse signal between described valve control system and gate pole plate adopts five pulse codes, comprises that pulse is turn-offed in valve control system to recovery protection firing starting impulse, recovery protection firing trigger impulse and the recovery protection firing triggering of gate pole plate and gate pole plate to the negative voltage of valve control system is set up pulse and recovery protection firing action return pulse.
Described valve control system receive negative voltage set up signal after the recovery protection firing function of enabling gate pole plate immediately.
The invention has the beneficial effects as follows: the present invention is controlled the scope of thyristor reverse recovery startup by increasing the logic Rule of judgment, the thyristor recovery protection firing is divided into to normal mode and special pattern, under special pattern the shielding valve control system in reverse recovery the Trigger Function to whole single valve, guaranteed the correctness of recovery protection firing phase defencive function under the normal mode, guaranteed again closing in time of recovery protection firing function under the special pattern, realized the requirement that converter valve triggers recovery protection firing under different operating modes, and greatly reduce under special operation condition the probability of happening that causes false triggering because of the recovery protection firing action.
The accompanying drawing explanation
Fig. 1 is the control sequential chart of valve control system of the present invention to the thyristor recovery protection firing;
Fig. 2 is the control flow chart of valve control system of the present invention to the thyristor recovery protection firing;
Fig. 3 is DC converter valve major loop wiring schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described.
Valve control system passes through the transmitted signal to the gate pole plate, carry out the running status of control gate pole plate, and then the function of realization control converter valve thyristor conducting and shutoff, valve control system described here refers to the converter valve control appliance, and the gate pole plate is the control unit of thyristor level.As shown in Figure 1, wherein the FCS representative is the converter valve Trig control signal for the flow graph of its signal and sequential chart; What BYPASS represented is converter valve bypass useful signal; What DBLK represented is the converter valve unlocking signal; What TRP represented is the recovery protection firing control signal.
The work of valve control system and gate pole plate adopts five pulse codes, and the control principle of five pulse codes is that 1 work period of thyristor is divided into to four-stage, opens the stage negative voltage establishment stage, reverse recovery detection-phase, and state-detection stage.What valve control system was given the gate pole plate is pulse code, and what the gate pole plate was given valve control system is thyristor state reporting signal.Control sequential of the present invention as shown in Figure 1; pulse 1; 2; 3; represent respectively the recovery protection firing starting impulse of valve control system to the gate pole plate, the recovery protection firing trigger impulse, recovery protection firing triggers and turn-offs pulse; 4,5 of pulses represent that gate pole plate to the negative voltage of valve control system is set up signal and signal is returned in the recovery protection firing action.
After receiving that negative voltage is set up signal; valve control system is the recovery protection firing function of enabling gate pole plate immediately; when reverse recovery is greater than threshold value; the gate pole plate sends a negative voltage to valve control system and sets up signal; the quantity of valve control system statistics return signal; when the thyristor quantity that the generation negative voltage on a valve is set up signal at the appointed time reaches some, valve control system sends a reverse recovery starting impulse to the gate pole plate, starts the recovery protection firing function.
The gate pole plate can be returned a recovery protection firing actuating signal to valve control system in the thyristor triggering and conducting; when the thyristor quantity of the recovery protection firing actuating signal on a valve reaches some; valve control system can send one to the gate pole plate and trigger dipulse, goes to trigger all thyristor conductings in this valve.After the time (approximately 1000 milliseconds) of detecting in reverse recovery, valve control system sends the 3rd simple venation and brings and close reverse recovery and detect loop.Equally, corresponding the previous case, i.e., when reverse recovery action number is greater than some, after valve control system sends dipulse, equally yet has 1 and turn-off pulse.
As shown in Figure 2, in the present invention, on original recovery protection firing function and the control constant basis of sequential; operating mode according to converter valve; in the phase III of controlling, for valve control system increases by 1 control signal, control the reverse recovery Trigger Function of valve control system.Specific as follows:
For the startup of recovery protection firing, the valve control provides two kinds of patterns to select, and normal mode and special pattern, select normal mode when system is normally moved, and in throwing bypass, locking and other definition operating mode, selects special pattern constantly.Introduce again a signals reverse convalescence protection control signal TRP in valve control system, the criterion whether normally started for the recovery protection firing function.By this signal, complete following logic judgement: under AD HOC, definition of T RP signal is effective (TRP=1), no longer start under the reverse recovery Trigger Function normal mode of valve control system, when TRP invalidating signal (TRP=0), normally start the reverse recovery Trigger Function of valve control system.
The present invention is controlled the scope of thyristor reverse recovery startup by increasing the logic Rule of judgment, can realize under different operating modes, the defencive function of thyristor reverse recovery being controlled.Both guaranteed that the original recovery protection firing function of valve control system was unaffected, also avoided under some special operation condition by thyristor recovery protection firing action and cause the false triggering of thyristor in reverse recovery.
Claims (4)
1. the valve control system control method to the thyristor recovery protection firing, it is characterized in that: described optimal control method comprises the following steps:
1) according to the operating mode of valve control system, the recovery protection firing of valve control system is triggered and is divided into normal mode and special pattern, described special pattern refers to when converter valve is carried out locking or thrown the bypass operation, the false triggering that the valve control system in the reverse recovery and protection phase causes converter valve;
Whether the recovery protection firing that 2) judges valve control system triggers in special pattern, if not in special pattern, by normal sequential, carries out recovery protection firing startup, triggering and shutoff;
3), if in special pattern, judge whether converter valve enters reverse recovery;
4) if converter valve enters reverse recovery, by valve control system, to the gate pole plate, send recovery protection firing and trigger the shutoff pulse, otherwise, forbid sending the recovery protection firing starting impulse to the gate pole plate.
2. the control method of valve control system according to claim 1 to the thyristor recovery protection firing; it is characterized in that: described valve control system carrys out the running status of control gate pole plate by the transmitted signal, to realize controlling the function of converter valve thyristor conducting and shutoff.
3. the control method of valve control system according to claim 2 to the thyristor recovery protection firing; it is characterized in that: the pulse signal between described valve control system and gate pole plate adopts five pulse codes, comprises that pulse is turn-offed in valve control system to recovery protection firing starting impulse, recovery protection firing trigger impulse and the recovery protection firing triggering of gate pole plate and gate pole plate to the negative voltage of valve control system is set up pulse and recovery protection firing action return pulse.
4. the control method of valve control system according to claim 3 to the thyristor recovery protection firing is characterized in that: described valve control system receive negative voltage set up signal after the recovery protection firing function of enabling gate pole plate immediately.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310238780.9A CN103490439B (en) | 2013-06-17 | 2013-06-17 | A kind of valve control system is to the control method of thyristor recovery protection firing |
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| CN201310238780.9A CN103490439B (en) | 2013-06-17 | 2013-06-17 | A kind of valve control system is to the control method of thyristor recovery protection firing |
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| CN103490439A true CN103490439A (en) | 2014-01-01 |
| CN103490439B CN103490439B (en) | 2016-01-20 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104967287A (en) * | 2015-06-30 | 2015-10-07 | 许继电气股份有限公司 | Method of automatically sending reverse recovery protection trigger state signal of converter valve |
| 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 |
| CN107765118A (en) * | 2017-09-22 | 2018-03-06 | 许继电气股份有限公司 | A kind of test device and method of light-operated converter valve recovery protection firing unit |
| CN112039588A (en) * | 2020-07-24 | 2020-12-04 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Optical fiber communication architecture and method for conventional direct current converter valve control protection system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0880057A (en) * | 1994-09-05 | 1996-03-22 | Toshiba Corp | Protective system of ac-dc converter |
| CN101599645A (en) * | 2009-04-30 | 2009-12-09 | 北京网联直流工程技术有限公司 | A kind of method that prevents the overvoltage of HVDC (High Voltage Direct Current) transmission system inversion-side reverse polar wire |
| CN102035189A (en) * | 2010-10-12 | 2011-04-27 | 中国电力科学研究院 | Novel monitoring and protecting system for test thyristor of converter valve module |
-
2013
- 2013-06-17 CN CN201310238780.9A patent/CN103490439B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0880057A (en) * | 1994-09-05 | 1996-03-22 | Toshiba Corp | Protective system of ac-dc converter |
| CN101599645A (en) * | 2009-04-30 | 2009-12-09 | 北京网联直流工程技术有限公司 | A kind of method that prevents the overvoltage of HVDC (High Voltage Direct Current) transmission system inversion-side reverse polar wire |
| CN102035189A (en) * | 2010-10-12 | 2011-04-27 | 中国电力科学研究院 | Novel monitoring and protecting system for test thyristor of converter valve module |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104967287A (en) * | 2015-06-30 | 2015-10-07 | 许继电气股份有限公司 | Method of automatically sending reverse recovery protection trigger state signal of converter valve |
| CN104967287B (en) * | 2015-06-30 | 2018-01-23 | 许继电气股份有限公司 | A kind of converter valve Reverse recovery protects triggering state signal upper delivery method automatically |
| CN107765118A (en) * | 2017-09-22 | 2018-03-06 | 许继电气股份有限公司 | A kind of test device and method of light-operated converter valve recovery protection firing unit |
| CN107765118B (en) * | 2017-09-22 | 2020-02-21 | 许继电气股份有限公司 | Testing device and method for reverse recovery period protection unit of light-operated converter valve |
| CN112039588A (en) * | 2020-07-24 | 2020-12-04 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Optical fiber communication architecture and method for conventional direct current converter valve control protection system |
| CN112039588B (en) * | 2020-07-24 | 2021-07-06 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Optical fiber communication architecture and method for conventional direct current converter valve control protection system |
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| CN103490439B (en) | 2016-01-20 |
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