CN104979843A - Simulation method for improving accuracy of judging direct-current phase commutation failure - Google Patents
Simulation method for improving accuracy of judging direct-current phase commutation failure Download PDFInfo
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- CN104979843A CN104979843A CN201410801426.7A CN201410801426A CN104979843A CN 104979843 A CN104979843 A CN 104979843A CN 201410801426 A CN201410801426 A CN 201410801426A CN 104979843 A CN104979843 A CN 104979843A
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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]
Abstract
The invention provides a simulation method for improving accuracy of judging direct current phase commutation failure. The method comprises: judging alternating current bus voltage at a direct current system inverter side, and simultaneously judging a phase commutation extinction angle of an inverter station converter valve of a direct current system; and when the alternating current bus voltage and the phase commutation extinction angle of the inverter station converter valve are detected to reach or be lower than a set threshold, considering that phase commutation failure occurs in the direct current system. According to the method, the direct current commutation failure is determined by the alternating current bus voltage at the direct current system inverter side and the phase commutation extinction angle of the inverter side converter valve, thereby improving probability of judging the direct current commutation failure, and reducing probability of mis-judging the direct current phase commutation failure. The method disclosed by the invention can improve the accuracy of judging the direct current commutation failure in simulation calculation; and in simulation means, the method is used to judge, so that the characteristics of direct current system can be simulated more practically, and the simulation accuracy of the whole system is improved.
Description
Technical field
The present invention relates to a kind of emulation mode improving differentiation direct-current commutation failure accuracy rate, especially improve by the method the method differentiating direct-current commutation failure accuracy rate in the emulation of customary DC transmission system.
Background technology
Along with the rapid growth of economy, also more and more higher to the demand of electricity consumption, and the energy source distribution of China and electricity consumption skewness, energy-intensive place often need for electricity is little, and the community energy of contrary load intensive and scarcity thereof, therefore the DC transmission system of long distance, voltage levels obtains under this background and develops fast, and south electric network has built up eight times DC transmission system at present.For the problem alleviating energy skewness provides solution, the high efficiency transmission electric energy of multiple-circuit line transmission of electricity energy, but also there is certain hidden danger simultaneously, if namely the drop point of many direct currents is relatively concentrated, then the fault in ac transmission system of a direct current drop point voltage levels may cause multiple-circuit line commutation failure, and multiple-circuit line commutation failure is once the duration is long, then the stability of electrical network is produced destructive greatly, therefore need to take Control Measure to multiple-circuit line commutation failure.
During current electromechanical transient simulation (as: BPA) calculates, for the criterion of direct-current commutation failure, mainly judge according to DC inversion station ac bus voltage and voltage change ratio, namely ac bus voltage is lower than the threshold value (as: 0.9p.u.) of setting, then think that direct current there occurs commutation failure.But according to DC field ruuning situation: alternating voltage is lower than in 0.9pu situation, and Partial DC transmission system commutation failure does not occur; Also exist under alternating voltage is more than or equal to 0.9pu situation, DC transmission system there occurs commutation failure.So this criterion is very inaccurate.Stability analysis when making to adopt this standard to carry out alternating current-direct current interconnection system fault, the credible result degree drawn is little.According to DC transmission system commutation failure Analysis on Mechanism, when converter valve commutation extinguish angle is less than a certain numerical value (as: 5 degree), commutation failure can be there is.Namely, when the commutation extinguish angle of converter valve is lower than 5 °, there is commutation failure and belong to Great possibility.
When large scale system stability is studied, main use electromechanical transient simulation software.This software can not reflect detailed control details as electro-magnetic transient software to the modelling of direct current system, thus when judging direct-current commutation failure often through ac bus voltage as criterion.Contrasted with on-the-spot by emulation, direct-current commutation failure difference to some extent in this criterion and actual motion, if add the commutation extinguish angle differentiating ac bus voltage and Inverter Station converter valve at electromechanical transient software simultaneously, then greatly can improve the accuracy rate of direct-current commutation failure.To the stability of research Iarge-scale system, there is larger help.
Summary of the invention
Object of the present invention is exactly provide a kind of emulation mode differentiating direct-current commutation failure accuracy rate that improves to overcome defect that above-mentioned prior art exists, and the method can improve the accuracy rate differentiating direct-current commutation failure greatly, makes simulation result more credible.The system that multiple-circuit line is run, accurately judge that the direct-current commutation failure caused because of fault in ac transmission system seems extremely important, can understand maximum to the risk causing multiple-circuit line commutation, to carry out prevention counter-measure for which fault in ac transmission system.
In order to achieve the above object, solution of the present invention is: the present invention improves the emulation mode differentiating direct-current commutation failure accuracy rate, by judging the ac bus voltage of direct current system inverter side, judge the commutation extinguish angle of direct current system Inverter Station converter valve simultaneously, when detect the commutation extinguish angle of ac bus voltage and Inverter Station converter valve all reach or threshold lower than separately setting time, then think that direct current system there occurs commutation failure.
The threshold value of described direct current system inverter side ac bus voltage is set to certain value, and when inverter side ac bus voltage is lower than the definite value set, this condition is set up.
The threshold of described converter valve commutation extinguish angle is set to a fixed angle, and when the commutation extinguish angle at DC inversion station is lower than this fixed angle, this condition is set up.
The present invention improves the emulation mode differentiating direct-current commutation failure accuracy rate, must meet when requiring as follows simultaneously, just think that direct current system there occurs commutation failure:
1) threshold value of described direct current system inverter side ac bus voltage is set to certain value, and when inverter side ac bus voltage is lower than the definite value set, this condition is set up;
2) threshold of described converter valve commutation extinguish angle is set to a fixed angle, and when the commutation extinguish angle at DC inversion station is lower than this fixed angle, this condition is set up.
The present invention improves the emulation mode of differentiation direct-current commutation failure accuracy rate for the dynamo-electric Transient calculation of electric power system.
The present invention improves the emulation mode of differentiation direct-current commutation failure accuracy rate compared with the method for existing judgement direct-current commutation failure, and this method can improve the accuracy rate differentiating direct-current commutation failure greatly, avoids judging direct-current commutation failure by accident, more has confidence level.
Accompanying drawing explanation
Fig. 1 is the flow chart of the emulation mode of the judgement direct-current commutation failure that the present invention proposes;
Fig. 2 is the schematic diagram of DC transmission system of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
The present invention proposes a kind of emulation mode improving differentiation direct-current commutation failure accuracy rate, and one of them embodiment as shown in Figure 1.The present invention improves the emulation mode differentiating direct-current commutation failure accuracy rate, by judging the ac bus voltage of direct current system inverter side, judge the commutation extinguish angle of direct current system Inverter Station converter valve simultaneously, when detect the commutation extinguish angle of ac bus voltage and Inverter Station converter valve all reach or threshold lower than separately setting time, then think that direct current system there occurs commutation failure.
The threshold value of described direct current system inverter side ac bus voltage is set to certain value, and when inverter side ac bus voltage is lower than the definite value set, this condition is set up.
The threshold of described converter valve commutation extinguish angle is set to a fixed angle, and when the commutation extinguish angle at DC inversion station is lower than this fixed angle, this condition is set up.
The present invention improves the emulation mode differentiating direct-current commutation failure accuracy rate, must meet when requiring as follows simultaneously, just think that direct current system there occurs commutation failure:
1) threshold value of described direct current system inverter side ac bus voltage is set to certain value, and when inverter side ac bus voltage is lower than the definite value set, this condition is set up;
2) threshold of described converter valve commutation extinguish angle is set to a fixed angle, and when the commutation extinguish angle at DC inversion station is lower than this fixed angle, this condition is set up.
The present invention improves the emulation mode of differentiation direct-current commutation failure accuracy rate for the dynamo-electric Transient calculation of electric power system.Calculate as applied wider PSD-BPA electromechanical transient simulation at present.
Described direct current system is the customary DC transmission system of commutation device based on thyristor.Described ac bus voltage, mainly refers to the ac bus voltage at DC inversion station, generally takes the ac bus voltage of stream change as basis for estimation.The threshold value of described ac bus voltage, can be set to 0.9p.u. (i.e. the reference voltage of 0.9 times), think that this condition is set up lower than this value.
The commutation extinguish angle of described converter valve, mainly refers to the commutation extinguish angle of Inverter Station, and the threshold value of this optimum configurations can be 5 °.
The present invention can not significantly increase simulation work difficulty, can improve the accuracy rate differentiating direct-current commutation failure, reflects the characteristic of the direct current system commutation failure in actual motion more really.
Should be noted that: only illustrate that technical scheme of the present invention is not intended to limit in conjunction with above-described embodiment.Those of ordinary skill in the field are to be understood that: those skilled in the art can modify to the specific embodiment of the present invention or equivalent replacement, but these amendments or change are all being applied within the patent requirements protection range awaited the reply.
Claims (6)
1. one kind is improved the emulation mode differentiating direct-current commutation failure accuracy rate, it is characterized in that: by judging the ac bus voltage of direct current system inverter side, judge the commutation extinguish angle of direct current system Inverter Station converter valve simultaneously, when detect the commutation extinguish angle of ac bus voltage and Inverter Station converter valve all reach or threshold lower than separately setting time, then think that direct current system there occurs commutation failure.
2. the emulation mode improving differentiation direct-current commutation failure accuracy rate according to claim 1, it is characterized in that the threshold value of described direct current system inverter side ac bus voltage is set to certain value, when inverter side ac bus voltage is lower than the definite value set, this condition is set up.
3. the emulation mode improving differentiation direct-current commutation failure accuracy rate according to claim 1, it is characterized in that the threshold of described converter valve commutation extinguish angle is set to a fixed angle, when the commutation extinguish angle at DC inversion station is lower than this fixed angle, this condition is set up.
4. according to claim 1ly improve the emulation mode differentiating direct-current commutation failure accuracy rate, it is characterized in that meeting when requiring as follows simultaneously, just think that direct current system there occurs commutation failure:
1) threshold value of described direct current system inverter side ac bus voltage is set to certain value, and when inverter side ac bus voltage is lower than the definite value set, this condition is set up;
2) threshold of described converter valve commutation extinguish angle is set to a fixed angle, and when the commutation extinguish angle at DC inversion station is lower than this fixed angle, this condition is set up.
5. the raising according to any one of Claims 1-4 differentiates the emulation mode of direct-current commutation failure accuracy rate, it is characterized in that described emulation mode is for the dynamo-electric Transient calculation of electric power system.
6. according to claim 5ly improve the emulation mode differentiating direct-current commutation failure accuracy rate, it is characterized in that described direct current system is is the customary DC transmission system of commutation device based on thyristor.
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| CN201410801426.7A CN104979843A (en) | 2014-12-22 | 2014-12-22 | Simulation method for improving accuracy of judging direct-current phase commutation failure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106787896A (en) * | 2017-03-02 | 2017-05-31 | 南方电网科学研究院有限责任公司 | Avoid blow-out angular measurement abnormal circuit and avoid direct current transportation commutation failure circuit |
| CN108964110A (en) * | 2018-07-26 | 2018-12-07 | 清华大学 | A kind of method of discrimination and system of secondary commutation failure |
| CN114079290A (en) * | 2020-08-18 | 2022-02-22 | 许继电气股份有限公司 | Method and device for simulating commutation failure of direct current transmission system in PSS/E |
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| CN103065016A (en) * | 2013-01-07 | 2013-04-24 | 华南理工大学 | Method and system for determining alternating-current system fault range resulting in direct-current commutation failure |
| CN103545835A (en) * | 2013-09-22 | 2014-01-29 | 国家电网公司 | Direct-current power system commutation failure judgment method |
| CN103812129A (en) * | 2014-01-16 | 2014-05-21 | 东北电力大学 | Method for determining commutation failure of multi-infeed direct current power transmission system |
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2014
- 2014-12-22 CN CN201410801426.7A patent/CN104979843A/en active Pending
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| CN103065016A (en) * | 2013-01-07 | 2013-04-24 | 华南理工大学 | Method and system for determining alternating-current system fault range resulting in direct-current commutation failure |
| CN103545835A (en) * | 2013-09-22 | 2014-01-29 | 国家电网公司 | Direct-current power system commutation failure judgment method |
| CN103812129A (en) * | 2014-01-16 | 2014-05-21 | 东北电力大学 | Method for determining commutation failure of multi-infeed direct current power transmission system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787896A (en) * | 2017-03-02 | 2017-05-31 | 南方电网科学研究院有限责任公司 | Avoid blow-out angular measurement abnormal circuit and avoid direct current transportation commutation failure circuit |
| CN108964110A (en) * | 2018-07-26 | 2018-12-07 | 清华大学 | A kind of method of discrimination and system of secondary commutation failure |
| CN108964110B (en) * | 2018-07-26 | 2020-05-01 | 清华大学 | Method and system for judging secondary commutation failure |
| CN114079290A (en) * | 2020-08-18 | 2022-02-22 | 许继电气股份有限公司 | Method and device for simulating commutation failure of direct current transmission system in PSS/E |
| CN114079290B (en) * | 2020-08-18 | 2024-04-12 | 许继电气股份有限公司 | Method and device for simulating commutation failure of direct current transmission system in PSS/E |
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