CN102185285B - Protection configuration method for converter valve in flexible direct current power transmission system - Google Patents
Protection configuration method for converter valve in flexible direct current power transmission system Download PDFInfo
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Abstract
The invention relates to a protection configuration method of a converter valve in a flexible direct current power transmission system. The method is characterized by comprising a protection configuration method used when a wiring fault of an alternating current bus and a valve arm in a station is detected by a valve base controller, a protection configuration method used when an alternating current overcurrent fault or a bridge arm overcurrent fault in the station is detected by the valve base controller and a protection configuration method used when an unbalance bridge arm voltage fault in the station is detected by the valve base controller. A protection scheme for realizing bottom layer protection configuration is discussed as a key point specific to converter valve faults of different types. By adopting the method, the requirement of a system on high running reliability is met effectively.
Description
Technical field
The present invention relates to collocation method, specifically, relate to the protection collocation method of flexible DC power transmission system converter valve.
Background technology
Flexible DC power transmission is a kind of novel high voltage dc transmission technology, and it at the power supply place such as hydroelectric plant or thermal power plant, becomes direct current by conventional AC electricity by voltage-source type current transformer, electric pressure tens between hundreds of kilovolt; By the transmission line such as overhead wire or cable, electric power is delivered to load place, a distant place, to meet client's need for electricity.
The flexible DC power transmission engineering having put into operation in world wide at present has 13, and maximum transfer capacity reaches 400MW; Domestic Section 1 flexible DC power transmission engineering will put into operation in Shanghai in 4 ends in 2011; In planning, project under construction has nine, and heap(ed) capacity reaches 800MW, and estimating follow-uply also will have many flexible direct current circuits to list construction plan in.Jumbo electric power transfer like this, has proposed high requirement to the operational reliability of flexible DC power transmission system.
Flexible DC power transmission system is made up of three parts, comprises two current conversion stations that are positioned at power supply and load place, and connects direct current cables or the overhead wire at two stations; Current conversion station internal main will be made up of the main primary equipment such as transformer, reactor, converter valve, isolating switch, by-pass knife switch, and wherein nucleus equipment is flexible direct current converter valve.Flexible direct current converter station fault is generally divided into AC fault, DC side fault; and three kinds of converter valve faults, AC and DC side error protection is realized by the control system of standing (being made up of assemblies such as voltage transformer, current transformer, the protection of alternating current-direct current side filter, tranformer protection, fieldbus, system servers).
At present; domestic flexible DC power transmission does not have actual motion engineering; and in conventional DC transmission system, the protection of thyristor valve does not adopt the method for layered configuration; but the converter valve degree of modularity of flexible DC power transmission system is higher; each converter valve all can isolated operation; therefore adopt conventional centralized protection scheme, cannot meet the requirement of system high reliability operation.For flexible direct current converter valve internal fault, i.e. converter valve fault on ordinary meaning, the false voltage electric current that it causes, and electric current and voltage rate of change is all very large, may exceed the reaction speed of station control system; If send latch-up protection instruction again by the work of valve base controller termination converter valve Deng station control system, can cause false voltage electric current to exceed the tolerance range of converter valve device and cause damaging, therefore for converter valve fault, independently protection mechanism need to be set.
Summary of the invention
The object of the invention is in view of the foregoing defects the prior art has; a kind of protection configuration method for converter valve in flexible direct current power transmission system is provided; for dissimilar converter valve fault; focus on the protection scheme by protective underlayer Configuration, the method can effectively meet the requirement of system high reliability operation.
A kind of protection configuration method for converter valve in flexible direct current power transmission system provided by the invention, its improvements are to comprise that protection collocation method and valve base controller that protection collocation method, valve base controller when interior ac bus and valve arm Wiring faults are arrived at a station in the detection of valve base controller detects while arriving at a station interior AC overcurrent or brachium pontis over current fault detect the protection collocation method while arriving at a station interior bridge arm voltage imbalance fault.
The provided by the invention first preferred protection configuration method for converter valve in flexible direct current power transmission system, the protection collocation method that described valve base controller detects while arriving at a station interior ac bus and valve arm Wiring faults is the first temporary transient locking converter trigger impulse of valve base controller; If stood, the failure locking signal of control system occurs simultaneously, and valve base controller transfers Permanent lockout converter to; If not, valve base controller is attempted unlocking, once secondary overcurrent transfers Permanent lockout to.
The provided by the invention second preferred protection configuration method for converter valve in flexible direct current power transmission system, it is fault current value locking converter immediately while being greater than 1.4p.u that valve base controller detects protection collocation method while arriving at a station interior AC overcurrent or brachium pontis over current fault; Locking converter when fault current value is greater than 1.2p.u and reaches more than three times; When fault current maximum is higher than 1.1p.u and exceed 2 hours locking converters.
The provided by the invention the 3rd preferred protection configuration method for converter valve in flexible direct current power transmission system; once the protection collocation method that valve base controller detects while arriving at a station interior bridge arm voltage imbalance fault is that bridge arm voltage sum reaches operating value with the difference of protection set point; and the duration also reaches preset value, the valve base controller trigger impulse of locking converter immediately.
The provided by the invention the 4th preferred protection configuration method for converter valve in flexible direct current power transmission system; described valve base controller comprises the optical-electrical converter, measurement mechanism, the supervising device that connect by optical cable; described optical-electrical converter is also connected with station control system, and described measurement mechanism is also connected with converter valve with supervising device.
The provided by the invention the 5th preferred protection configuration method for converter valve in flexible direct current power transmission system, described station control system comprises operations staff's layer, controls protective layer and measures layer, described operations staff's layer is connected with Industrial Ethernet, described measurement layer is connected with fieldbus, and described control protective layer is connected with Industrial Ethernet and fieldbus; Described operations staff's layer comprises system server; Described control protective layer comprises controller and AC/DC filter protection, tranformer protection; Described measurement layer comprises voltage current transformer; System server receives the operating instruction of higher level power system dispatching department, through calculating the running state parameter that converter is corresponding, and under reach valve base controller, accept the status signal of valve base controller report simultaneously.
The provided by the invention the 6th preferred protection configuration method for converter valve in flexible direct current power transmission system, described measurement mechanism is the device of measuring voltage electric current.
The provided by the invention the 7th preferred protection configuration method for converter valve in flexible direct current power transmission system; described supervising device is device for monitoring running state; comprise electric current and voltage monitoring and monitoring temperature; one end of described electric current and voltage monitoring and monitoring temperature is connected with station control system by optical cable; the other end is connected with one end of temperature sensor, current Hall and AD sampling A/D chip, and the other end of described temperature sensor, current Hall and AD sampling A/D chip is connected with converter valve.
The provided by the invention the 8th preferred protection configuration method for converter valve in flexible direct current power transmission system, described voltage current transformer is alternating current magnetic-type voltage current transformer and DC electronic voltage current transformer.
Technique scheme and design thereof:
For typical converter valve faults such as ac bus fault, the short circuit of valve arm line, bridge arm voltage imbalances in station; the electric current and voltage of the main measurement point of valve base controller fast detecting converter valve; once exceed protection action set point; and the duration exceedes and presets; valve base controller directly sends latch-up protection instruction to converter valve; the work of locking converter valve, to avoid the damage of converter valve.
When occurring in station when ac bus fault, converter requires locking rapidly in 2ms, and this blocking function can only be realized by valve base controller: when valve base controller detects while arriving at a station interior ac bus overcurrent, and temporarily locking converter trigger impulse; If the failure locking signal of upper system occurs simultaneously, transfer Permanent lockout converter to, if but do not occurred, valve base controller trial solution is except pulse blocking, once there is secondary overcurrent, the trigger impulse of Permanent lockout converter submodule is controlled system with tripping AC circuit breaker by fault information reporting station, effectively isolated fault simultaneously.
In the time of the internal faults such as short circuit between converter generation valve arm line ground connection, the short circuit of valve arm line, brachium pontis; if the difference of each brachium pontis electric current sum and direct current is non-vanishing and lasting setting-up time value after; valve base controller will be realized the action of valve differential protection; protection flow process is with ac bus fault in above-mentioned station; protection action consequence is locking converter trigger impulse, and tripping AC circuit breaker.
Require the station internal fault of converter quick lock for ac bus fault in station etc., valve base controller can be according to temporary fault signal or permanent fault signal, configure different protection schemes, there is equally block signal, the direct Permanent lockout converter of valve base controller in the control system of even standing when the locking of valve base controller; If only have the valve base controller signal that breaks down, temporary transient locking continuing for some time, reattempts release converter, to improve converter operational reliability.In the time of AC overcurrent in generation station or brachium pontis over current fault, valve base controller is realized the flow-resistant capacity of protecting three sections of designs of action to should be taken into account fault in ac transmission system checkout time and converter valve: in the time that fault current value is greater than 1.4p.u, and locking converter immediately; In the time that fault current value is greater than 1.2p.u and reach more than three times, locking converter; When fault current maximum is higher than 1.1p.u and exceed 2 hours, locking converter: for station internal faults such as brachium pontis overcurrents, valve base controller is realized protection configuration according to inverse time lag principle, while being greater than protection higher limit, the direct locking converter of valve base controller; While being greater than normal runtime value and continue to preset after the time, valve base controller sends blocking order to converter.
For the uneven station internal fault that waits of bridge arm voltage; valve base controller is taked directly protection configuration; be greater than normal runtime value and continue for some time as long as occur; valve base controller Permanent lockout converter at once; in the time there is bridge arm voltage imbalance fault; if bridge arm voltage sum reaches operating value with the difference of protection set point; and the duration also reaches preset value; the valve base controller trigger impulse of locking converter immediately; simultaneously by fault information reporting station control system, tripping AC circuit breaker.
The running status instruction of valve base controller receiving station control system, whether production burst instruction is issued to converter valve, and accepts the running state information that converter valve is uploaded, offer supervising device and normally work with judgment means.
Compared with prior art, a kind of protection configuration method for converter valve in flexible direct current power transmission system provided by the invention has the following advantages:
1, realized the effect of valve base controller for converter valve internal fault high speed reliably protecting;
2,, in the time there is converter valve internal fault, if only rely on control system in station to protect, likely protection action is rapid not, causes excessive false voltage or electric current to damage converter valve; And the protection allocation plan that adopts the present invention to propose, due to the quick acting of valve base controller, can effectively be realized the action to internal fault, and then protection converter valve is not damaged by false voltage or electric current;
3, simultaneously for different internal faults, the present invention proposes different protection allocation plans, realized the reliably protecting to different faults, and shorten the recovery time after fault clearance;
4, this collocation method is reliable, effectively, and carry out convenient.
Brief description of the drawings
Fig. 1 is: the overall structure schematic diagram of a kind of protection configuration method for converter valve in flexible direct current power transmission system provided by the invention;
Fig. 2 is: station control System Construction and station control system and the valve base controller relational structure schematic diagram of a kind of protection configuration method for converter valve in flexible direct current power transmission system provided by the invention;
Fig. 3 is: the structure of the supervising device of a kind of protection configuration method for converter valve in flexible direct current power transmission system provided by the invention and with the schematic diagram that is related to of station control system;
Embodiment
By the following examples a kind of protection configuration method for converter valve in flexible direct current power transmission system provided by the invention is done to further more detailed description.
Embodiment 1
The protection configuration method for converter valve in flexible direct current power transmission system of the present embodiment, comprises that protection collocation method and valve base controller that protection collocation method, valve base controller when interior ac bus and valve arm Wiring faults are arrived at a station in the detection of valve base controller detect while arriving at a station interior AC overcurrent or brachium pontis over current fault detect the protection collocation method while arriving at a station the uneven event of interior bridge arm voltage.
The protection collocation method that valve base controller detects while arriving at a station interior ac bus and valve arm Wiring faults is the first temporary transient locking converter trigger impulse of valve base controller; If the failure locking signal of upper system occurs simultaneously, valve base controller transfers Permanent lockout converter to; If not, valve base controller is attempted unlocking, once secondary overcurrent transfers Permanent lockout to.
It is fault current value locking converter immediately while being greater than 1.4p.u that valve base controller detects protection collocation method while arriving at a station interior AC overcurrent or brachium pontis over current fault; Locking converter when fault current value is greater than 1.2p.u and reaches more than three times; When fault current maximum is higher than 1.1p.u and exceed 2 hours locking converters.
Once the protection collocation method that valve base controller detects while arriving at a station interior bridge arm voltage imbalance fault is that bridge arm voltage sum reaches operating value with the difference of protection set point; and the duration also reaches preset value, the valve base controller trigger impulse of locking converter immediately.
As shown in Figures 1 and 3, valve base controller comprises the optical-electrical converter, measurement mechanism, the supervising device that connect by optical cable, and optical-electrical converter is also connected with station control system by cable, and measurement mechanism is all connected by cable with high-voltage commutation valve with supervising device; Wherein, measurement mechanism comprises electric current and voltage monitoring and monitoring temperature, and electric current and voltage monitoring is connected with converter valve by temperature sensor, current Hall and AD sampling A/D chip with monitoring temperature.
As shown in Figure 2, the control system of standing comprises operations staff's layer, control protective layer and measure layer, operations staff's layer comprises system server, control protective layer and comprise controller and AC/DC filter protection and tranformer protection, measure layer and comprise alternating current magnetic-type voltage current transformer and DC electronic voltage current transformer, wherein, control protective layer and measure layer and be all connected in bus, in service, system server receives the operating instruction of higher level's power system dispatching department, through calculating the running state parameter that converter is corresponding, and under reach valve base controller, accept the status signal of valve base controller report simultaneously.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; although the present invention is had been described in detail with reference to above-described embodiment; those of ordinary skill in the field are to be understood that: technical staff still can modify or be equal to replacement the specific embodiment of the present invention after reading present specification, but these amendments or change and all do not depart from the claim protection range that the present patent application awaits the reply within.
Claims (6)
1. a protection configuration method for converter valve in flexible direct current power transmission system, is characterized in that comprising that protection collocation method and valve base controller that protection collocation method, valve base controller when interior ac bus and valve arm Wiring faults are arrived at a station in the detection of valve base controller detect while arriving at a station interior AC overcurrent or brachium pontis over current fault detect the protection collocation method while arriving at a station interior bridge arm voltage imbalance fault;
The protection collocation method that described valve base controller detects while arriving at a station interior ac bus and valve arm Wiring faults is the first temporary transient locking converter trigger impulse of valve base controller; If stood, the failure locking signal of control system occurs simultaneously, and valve base controller transfers Permanent lockout converter to; If not, valve base controller is attempted unlocking, once secondary overcurrent transfers Permanent lockout to;
It is fault current value locking converter immediately while being greater than 1.4p.u that described valve base controller detects protection collocation method while arriving at a station interior AC overcurrent or brachium pontis over current fault; Locking converter when fault current value is greater than 1.2p.u and reaches more than three times; When fault current maximum is higher than 1.1p.u and exceed 2 hours locking converters;
Once the protection collocation method that described valve base controller detects while arriving at a station interior bridge arm voltage imbalance fault is that bridge arm voltage sum reaches operating value with the difference of protection set point; and the duration also reaches preset value, the valve base controller trigger impulse of locking converter immediately.
2. protection configuration method for converter valve in flexible direct current power transmission system according to claim 1; it is characterized in that described valve base controller comprises optical-electrical converter, measurement mechanism, the supervising device connecting by optical cable; described optical-electrical converter is also connected with station control system, and described measurement mechanism is also connected with converter valve with supervising device.
3. protection configuration method for converter valve in flexible direct current power transmission system according to claim 2, it is characterized in that described station control system comprises operations staff's layer, controls protective layer and measures layer, described operations staff's layer is connected with Industrial Ethernet, described measurement layer is connected with fieldbus, and described control protective layer is connected with Industrial Ethernet and fieldbus; Described operations staff's layer comprises system server; Described control protective layer comprises controller and AC/DC filter protection, tranformer protection; Described measurement layer comprises voltage current transformer; System server receives the operating instruction of higher level power system dispatching department, under reach controller, through calculating the running state parameter that converter is corresponding, then under reach valve base controller, accepted the status signal of valve base controller report by controller simultaneously.
4. protection configuration method for converter valve in flexible direct current power transmission system according to claim 3, is characterized in that described measurement mechanism is the device of measuring voltage electric current.
5. protection configuration method for converter valve in flexible direct current power transmission system according to claim 3; it is characterized in that described measurement mechanism; comprise electric current and voltage monitoring and monitoring temperature; one end of described electric current and voltage monitoring and monitoring temperature is connected with station control system by optical cable; the other end is connected with one end of temperature sensor, current Hall and AD sampling A/D chip, and the other end of described temperature sensor, current Hall and AD sampling A/D chip is connected with converter valve.
6. protection configuration method for converter valve in flexible direct current power transmission system according to claim 4, is characterized in that described voltage current transformer is alternating current magnetic-type voltage current transformer and DC electronic voltage current transformer.
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| CN201110095915.1A CN102185285B (en) | 2011-04-18 | 2011-04-18 | Protection configuration method for converter valve in flexible direct current power transmission system |
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| CN201110095915.1A CN102185285B (en) | 2011-04-18 | 2011-04-18 | Protection configuration method for converter valve in flexible direct current power transmission system |
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| CN103064016B (en) * | 2012-12-11 | 2015-05-06 | 国家电网公司 | Fault protection method for steady-state operation testing apparatus of modular multilevel converter (MMC) valve |
| CN103123482B (en) * | 2012-12-12 | 2016-05-25 | 国网智能电网研究院 | Be applicable to the valve monitoring equipment of large capacity MMC flexible DC power transmission transverter |
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| CN103296671B (en) * | 2013-04-09 | 2016-08-10 | 国家电网公司 | For flexible direct current power transmission system AC overvoltage protection and guard method |
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| CN104821556A (en) * | 2015-04-15 | 2015-08-05 | 国家电网公司 | Layered protecting configuration of outdoor low-voltage distribution area active compensation device and fault handling method |
| CN104953568B (en) * | 2015-07-17 | 2017-11-07 | 江苏雪梅制冷设备有限公司 | A kind of fault protecting method of flexible direct current power transmission system |
| CN105676100B (en) * | 2016-01-19 | 2019-01-18 | 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 | A kind of silicon-controlled electronic equipment applied voltage test method under wet environment |
| CN106207990A (en) * | 2016-07-13 | 2016-12-07 | 深圳供电局有限公司 | The rapid protecting device of a kind of flexible direct current system and guard method |
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| CN109217249B (en) * | 2018-10-09 | 2019-12-03 | 国电南瑞科技股份有限公司 | A kind of reliable bypass protection system and method for series devices |
| CN110068758B (en) * | 2019-04-22 | 2021-08-03 | 南方电网科学研究院有限责任公司 | Flexible direct current converter valve monitoring and diagnosing system |
| CN110148929B (en) * | 2019-06-10 | 2021-02-05 | 天津大学 | Annular direct-current micro-grid single-end protection method based on control and protection cooperation |
| CN110556802B (en) * | 2019-09-25 | 2021-05-28 | 南京南瑞继保电气有限公司 | Converter fault protection method for multi-converter direct-current transmission system |
| CN112134253B (en) * | 2020-08-19 | 2022-09-20 | 许继集团有限公司 | Unbalance identification and protection method of direct current energy consumption device |
| WO2024087164A1 (en) * | 2022-10-28 | 2024-05-02 | 宁德时代未来能源(上海)研究院有限公司 | Overcurrent protection method and system for energy storage valve, computer device, and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| SE520786C2 (en) * | 1997-03-24 | 2003-08-26 | Abb Ab | Electric power transmission system |
| CN101588061B (en) * | 2008-12-31 | 2012-06-13 | 中国电力科学研究院 | Thyristor valve triggering and monitoring system for fault current limiter |
| CN101726640B (en) * | 2009-12-23 | 2012-09-05 | 中国电力科学研究院 | Control and protection system of converter valve operating test device |
| CN101752873B (en) * | 2010-01-25 | 2012-05-23 | 株洲变流技术国家工程研究中心有限公司 | Protection method of DC electricity transmission high-voltage convertor station |
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