CN105633941A - Commutation failure suppression method based on virtual current limiter - Google Patents
Commutation failure suppression method based on virtual current limiter Download PDFInfo
- Publication number
- CN105633941A CN105633941A CN201510027123.9A CN201510027123A CN105633941A CN 105633941 A CN105633941 A CN 105633941A CN 201510027123 A CN201510027123 A CN 201510027123A CN 105633941 A CN105633941 A CN 105633941A
- Authority
- CN
- China
- Prior art keywords
- current
- virtual
- current limiter
- vdcol
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
The invention belongs to the technical field of power transmission of a power system, and in particular relates to a commutation failure suppression method based on a virtual current limiter. The virtual current limiter is equivalently connected in series to a traditional DC power transmission circuit, and when the DC current on the power transmission circuit increases, a current instruction is rapidly adjusted by control of the virtual current limiter to achieve the purpose of suppressing the increase of the DC current. The commutation failure suppression method is applied to traditional high-voltage DC power transmission, the DC over-current amplitude is limited by the virtual current limiter when a fault occurs in the system, devices such as a smoothing reactor and a thyristor are protected, and the probability of commutation failure of the traditional DC power transmission system is reduced.
Description
Technical field
The invention belongs to power transmission and distribution technical field, be specifically related to a kind of commutation failure suppressing method based on virtual current limiter.
Background technology
Since the 1950's, tradition line commutation D.C. high voltage transmission (Line-Commutated-ConverterHighVoltageDirectCurrent, LCC-HVDC) worldwide obtains quick development with its Large Copacity long distance power transmission, active power quickly feature such as controlled.
But owing to LCC-HVDC adopts the triode thyristor without self-switching-off capability as commutation components, therefore LCC-HVDC system needs the AC system of some strength to realize commutation, it is necessary to AC network provides commutation voltage. When grid collapses or severe three-phase are asymmetric, causing that ac bus voltage declines, line voltage over zero is likely in advance, and the commutation overlap angle of LCC-HVDC valve arm will increase, and closing the angle of rupture will reduce, it is easy to cause commutation failure. After between two brachium pontis, commutation terminates, just exit the valve of conducting within a period of time of backward voltage effect, failing to recovery blocking ability, or commutation process fails to carry out complete during backward voltage always, both of these case threshold voltage be changed to positive to time all will be switched phase to the original predetermined valve exiting conducting by the valve of commutation, this is called commutation failure. When commutation failure occurs, there is short trouble in short-term in inverter side DC side, and inverter side DC voltage reduces, and rectification side DC voltage is of a relatively high, this makes the DC current of DC line quickly increase, and the equipment such as DC line, IGCT will bear over-current shock, affect service life of equipment. Additionally, due to the DC current of DC line is relatively big, inverter side can continue commutation failure, seriously limits straight-flow system through-put power, brings huge disturbance for whole AC-DC-AC system.
In prior art, VDCOL controls, by measuring AC line voltage value, to adjust DC current instruction. Under some failure condition, when finding DC voltage lower than a certain value, automatically reduce the setting valve of DC current regulator, after DC voltage recovers, automatically recover again setting valve. VDCOL can avoid the long-time commutation failure of inverter side, is conducive to the recovery of AC system voltage, improves the recovery characteristics of straight-flow system after fault.
But, when inverter side generation commutation failure, inverter side DC voltage substantially reduces, and rectification side DC voltage also has little time change. Until when DC current rises to bigger numerical, under the effect of the constant DC current control of rectification side, rectification side DC voltage just begins to decline, further, the DC current instruction of VDCOL output just can decline. Therefore, when current VDCOL controls for inverter side commutation failure, the restriction of DC current amplitude exists delayed, is also unfavorable for defence inverter side generation seriality commutation failure.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the present invention proposes a kind of commutation failure suppressing method based on virtual current limiter, the virtual reactor of equivalent series on DC power transmission line, system can be made properly functioning and manual control system is when blood pressure lowering state is run, the pressure drop �� that DC current produces on virtual reactance current limiterU *Without influence on the normal control of VDCOL, in the amplitude of system jam limit DC current, reduce the overcurrent amplitude of the equipment such as DC line, converter valve, reduce the probability of inverter side generation commutation failure to a certain extent.
The technical scheme is that, a kind of commutation failure suppressing method based on DC current limiter, it thes improvement is that: described virtual current limiter equivalent series is on the transmission line of electricity that Traditional DC is transmitted electricity, the pressure drop of its generation acts on the current limiting low-voltage in DC transmission system and controls VDCOL, and utilize gained DC voltage value, finally determine DC current instruction.
Further, the mode of the transmission line of electricity that described virtual current limiter equivalent series is transmitted electricity at Traditional DC comprises the following steps:
I, the virtual inductor parameter equivalent conversion accessed to connect are to control system, and convert formula is:
(1)
In formula,LFor to connect access virtual inductor parameter,I dNFor the rated current of described Traditional DC transmission system,U dNFor the rated voltage of described Traditional DC transmission system,L *For the virtual inductor value in equivalence conversion to control system.
II, by the DC current in control system to time derivation, and be multiplied by virtual inductor value, obtain the pressure drop that DC current produces on virtual current limiter, its computing formula is:
(2)
In formula,L *The virtual inductor value to control system is converted for equivalence,I d*For the DC current in equivalence conversion to control system, ��U *For the pressure drop that DC current produces on virtual current limiter.
III, by originally input VDCOL control DC voltage value deducted the pressure drop that DC current produces on virtual current limiter, obtain new DC voltage value, its computing formula is:
(3)
In formula,U d*For originally inputting the VDCOL magnitude of voltage controlled, ��U *For the pressure drop that DC current produces on virtual current limiter, for new DC voltage value.
Further, obtained new DC voltage value is as the VDCOL input quantity controlled, and obtains DC current instruction according to the VDCOL characteristic controlled.
Compared with prior art, beneficial effects of the present invention is as follows:
(1) method of the present invention reduces produced DC current amplitude after inverter side generation commutation failure, make the DC current suffered by device such as DC power transmission line, smoothing reactor, IGCT impact to reduce, be conducive to the safe and stable operation of equipment, the service life of extension device.
(2) method of the present invention can reduce the probability of DC transmission system generation commutation failure to a certain extent, is conducive to DC transmission system to recover rapidly from commutation failure;
(3) method of the present invention can effectively reduce the situation that Secondary cases commutation failure occurs in multi-infeed HVDC system, and the safe and stable operation for Ac/dc Power Systems provides certain guarantee.
Accompanying drawing explanation
Fig. 1 is the control mode of virtual current limiter.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is clearly and completely described.
As it is shown in figure 1, the implementing procedure figure that Fig. 1 is the commutation failure suppressing method based on virtual current limiter; In figure,U d*For originally inputting the VDCOL magnitude of voltage controlled, ��U *For the pressure drop that DC current produces on virtual current limiter, for new DC voltage value,L *The virtual inductor value to control system is converted for equivalence,I d*For equivalence conversion to the DC current in control system, for differential operator, for the VDCOL current-order exported under virtual current limiter effect.
The technical scheme is that, a kind of commutation failure suppressing method based on DC current limiter, it thes improvement is that: described virtual current limiter equivalent series is on the transmission line of electricity that Traditional DC is transmitted electricity, the pressure drop of its generation acts on the current limiting low-voltage in DC transmission system and controls VDCOL, and utilize gained DC voltage value, finally determine DC current instruction.
Described virtual current limiter equivalent series comprises the following steps in the mode of the transmission line of electricity that Traditional DC is transmitted electricity:
I, the virtual inductor parameter equivalent conversion accessed to connect are to control system, and convert formula is:
(1)
In formula,LFor to connect access virtual inductor parameter,I dNFor the rated current of described Traditional DC transmission system,U dNFor the rated voltage of described Traditional DC transmission system,L *For the virtual inductor value in equivalence conversion to control system.
II, by the DC current in control system to time derivation, and be multiplied by virtual inductor value, obtain the pressure drop that DC current produces on virtual reactance current limiter, its computing formula is:
(2)
In formula,L *The virtual inductor value to control system is converted for equivalence,I d*For the DC current in equivalence conversion to control system, ��U *For the pressure drop that DC current produces on virtual reactance current limiter.
III, by originally input VDCOL control DC voltage value deducted the pressure drop that DC current produces on virtual reactance current limiter, obtain new DC voltage value, its computing formula is:
(3)
In formula,U d*For originally inputting the VDCOL magnitude of voltage controlled, ��U *For the pressure drop that DC current produces on virtual reactance current limiter, for new DC voltage value.
Obtained new DC voltage value is as the VDCOL input quantity controlled, and obtains DC current instruction according to the VDCOL characteristic controlled.
The above; being only the present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto, any those familiar with the art is in the technical scope that the invention discloses; the change that can readily occur in or replacement, all should be encompassed within protection scope of the present invention. Therefore, protection scope of the present invention should be as the criterion with scope of the claims.
Claims (4)
1. the commutation failure suppressing method based on virtual current limiter, it is characterized in that, described virtual current limiter equivalent series is on the transmission line of electricity that Traditional DC is transmitted electricity, the pressure drop of its generation acts on the current limiting low-voltage in DC transmission system and controls VDCOL, and utilize gained DC voltage value, finally determine DC current instruction.
2. a kind of virtual current limiter according to claim 1, it is characterised in that described virtual current limiter equivalent series comprises the following steps in the mode of the transmission line of electricity that Traditional DC is transmitted electricity:
I, the virtual inductor parameter equivalent conversion accessed to connect are to control system, and convert formula is:
(1)
In formula,LFor to connect access virtual inductor parameter,I dNFor the rated current of described Traditional DC transmission system,U dNFor the rated voltage of described Traditional DC transmission system,L *For the virtual inductor value in equivalence conversion to control system;
II, by the DC current in control system to time derivation, and be multiplied by virtual inductor value, obtain the pressure drop that DC current produces on virtual reactance current limiter, its computing formula is:
(2)
In formula,L *The virtual inductor value to control system is converted for equivalence,I d*For the DC current in equivalence conversion to control system, ��U *For the pressure drop that DC current produces on virtual reactance current limiter;
III, by originally input VDCOL control DC voltage value deducted the pressure drop that DC current produces on virtual reactance current limiter, obtain new DC voltage value, its computing formula is:
(3)
In formula,U d*For originally inputting the VDCOL magnitude of voltage controlled, ��U *For the pressure drop that DC current produces on virtual reactance current limiter, for new DC voltage value.
3. a kind of virtual current limiter according to claim 1, it is characterised in that obtained new DC voltage value is as the VDCOL input quantity controlled, and obtains DC current instruction according to the VDCOL characteristic controlled.
4. a kind of commutation failure suppressing method based on virtual current limiter according to claim 1, it is characterized in that, system is properly functioning and manual control system is when blood pressure lowering state is run, DC current only exists small ripple fluctuation, the pressure drop �� that DC current produces on virtual reactance current limiterU *Normal control without influence on VDCOL; When fault causes that DC current quickly increases, the pressure drop �� that DC current produces on virtual reactance current limiterU *It is input to the VDCOL new magnitude of voltage reduction controlled by making, and then VDCOL quickly reduces current-order, reaches the purpose of restriction direct current overcurrent, suppression persistence commutation failure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510027123.9A CN105633941B (en) | 2015-01-20 | 2015-01-20 | A kind of commutation failure suppressing method based on virtual current limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510027123.9A CN105633941B (en) | 2015-01-20 | 2015-01-20 | A kind of commutation failure suppressing method based on virtual current limiter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105633941A true CN105633941A (en) | 2016-06-01 |
| CN105633941B CN105633941B (en) | 2018-04-17 |
Family
ID=56048609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510027123.9A Active CN105633941B (en) | 2015-01-20 | 2015-01-20 | A kind of commutation failure suppressing method based on virtual current limiter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105633941B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106712070A (en) * | 2017-01-22 | 2017-05-24 | 全球能源互联网研究院 | Method and system for inhibiting commutation failures based on controllable resistor |
| CN106998075A (en) * | 2017-05-26 | 2017-08-01 | 云南电网有限责任公司电力科学研究院 | Suppress the method and system of the 12 pulsation follow-up commutation failures of inverter of IGCT |
| CN110768284A (en) * | 2019-11-01 | 2020-02-07 | 云南电网有限责任公司电力科学研究院 | Method for inhibiting direct current commutation failure based on VDCOL additional controller |
| CN112636379A (en) * | 2020-12-09 | 2021-04-09 | 国家电网有限公司 | Virtual control method and system for direct current |
| CN112928938A (en) * | 2021-03-25 | 2021-06-08 | 中国矿业大学 | Virtual reactance-based MMC direct current fault current limiting method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130035802A1 (en) * | 2011-08-02 | 2013-02-07 | Yashraj Khaitan | Power management device and system |
-
2015
- 2015-01-20 CN CN201510027123.9A patent/CN105633941B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130035802A1 (en) * | 2011-08-02 | 2013-02-07 | Yashraj Khaitan | Power management device and system |
Non-Patent Citations (1)
| Title |
|---|
| 郭利娜等: "抑制多馈入直流输电系统后续换相失败措施研究", 《电力自动化设备》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106712070A (en) * | 2017-01-22 | 2017-05-24 | 全球能源互联网研究院 | Method and system for inhibiting commutation failures based on controllable resistor |
| CN106712070B (en) * | 2017-01-22 | 2023-11-07 | 全球能源互联网研究院有限公司 | Method and system for inhibiting commutation failure based on controllable resistor |
| CN106998075A (en) * | 2017-05-26 | 2017-08-01 | 云南电网有限责任公司电力科学研究院 | Suppress the method and system of the 12 pulsation follow-up commutation failures of inverter of IGCT |
| CN110768284A (en) * | 2019-11-01 | 2020-02-07 | 云南电网有限责任公司电力科学研究院 | Method for inhibiting direct current commutation failure based on VDCOL additional controller |
| CN110768284B (en) * | 2019-11-01 | 2023-09-15 | 云南电网有限责任公司电力科学研究院 | Method for restraining direct current commutation failure based on VDCOL additional controller |
| CN112636379A (en) * | 2020-12-09 | 2021-04-09 | 国家电网有限公司 | Virtual control method and system for direct current |
| CN112928938A (en) * | 2021-03-25 | 2021-06-08 | 中国矿业大学 | Virtual reactance-based MMC direct current fault current limiting method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105633941B (en) | 2018-04-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109066759B (en) | Mixed double-feed-in direct current continuous commutation failure control method considering active balance | |
| CN107069679B (en) | A kind of symmetrical bipolar MMC DC side monopolar grounding fault passes through and restoration methods | |
| CN108418237B (en) | Method and device for controlling inter-station communication fault of multi-terminal direct-current power transmission system | |
| Li et al. | Offshore AC fault protection of diode rectifier unit-based HVdc system for wind energy transmission | |
| WO2017031991A1 (en) | Series hybrid bipolar direct-current transmission system having direct-current fault ride-through capability | |
| CN110417042B (en) | Safety control method and system for inhibiting continuous commutation failure of direct current system | |
| CN106849148B (en) | Alternating current fault ride-through control method for rectifying station of hybrid direct current transmission system | |
| CN109347133B (en) | Inversion side control method based on extra-high voltage direct current transmission project | |
| CN112886550B (en) | MMC flexible direct-current power grid self-adaptive fault clearing method based on source network coordination | |
| CN105048488A (en) | Flexible DC network DC short-circuit fault ride through method | |
| CN103730906B (en) | A kind of control method for coordinating suppressing Hybrid HVDC commutation failure | |
| CN105633941A (en) | Commutation failure suppression method based on virtual current limiter | |
| CN111934330B (en) | Active energy control method for offshore wind power under alternating current fault through flexible direct grid-connected system | |
| WO2023029813A1 (en) | Control method for suppressing overvoltage under fault of receiving-end power grid of hybrid direct-current power transmission system | |
| WO2023201922A1 (en) | Receiving end alternating-current fault ride-through control method for hybrid cascaded direct-current power transmission system | |
| Xu et al. | Modular multilevel converter with embedded energy storage for bidirectional fault isolation | |
| Wang et al. | A comprehensive improved coordinated control strategy for a STATCOM integrated HVDC system with enhanced steady/transient state behaviors | |
| CN111628507A (en) | Novel phase modulator and SVG coordinated control method for suppressing transient overvoltage | |
| Zheng et al. | Research on DC power control strategy for mitigating the continuous commutation failure | |
| Xin et al. | AC fault ride-through coordinated control strategy of LCC-MMC hybrid DC transmission system connected to passive networks | |
| Ouyang et al. | Fault security region modeling and adaptive current control method for the inverter station of DC transmission system | |
| WO2022000898A1 (en) | Method and system for coordinated control of high-voltage ride-through of wind turbine generator set | |
| CN109861192B (en) | Method for restraining direct-current fault current of flexible direct-current converter and application of method | |
| Rehman et al. | Coordinated control strategy for transient performance improvement of LCC based HVDC transmission system with STATCOM under weak AC grid | |
| Ma et al. | Optimized AC fault ride-through strategy for back-to-back VSC-HVDC system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |