CN103078400A - Bridge arm collecting protection system suitable for high-capacity MMC (Multi Media Controller) flexible direct-current power transmission system - Google Patents
Bridge arm collecting protection system suitable for high-capacity MMC (Multi Media Controller) flexible direct-current power transmission system Download PDFInfo
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Abstract
The invention provides a bridge arm collecting protection system suitable for a high-capacity MMC (Multi Media Controller) flexible direct-current power transmission system. The bridge arm collecting protection system comprises an MMC converter valve, a VBC (Vehicle Bridge Coupling) and a station control system which sequentially carry out data interaction. According to the bridge arm collecting protection system suitable for the high-capacity MMC flexible direct-current power transmission system, which is provided by the invention, the monitoring function for an integral complete signal interface and the state of a bridge arm sub-module is realized and the reliability and the stability of the operation of the sub module are ensured.
Description
Technical field
The invention belongs to the control field of high-voltage large-capacity flexible DC power transmission converter, be specifically related to a kind of brachium pontis that is applicable to large capacity MMC flexible DC power transmission system and gather protection system.
Background technology
Modularization multi-level converter is composed in series by a plurality of submodules, need to carry out different real-time switching control to independent submodule according to capacitance voltage and submodule operating state, level number is more, and control cycle is shorter in real time, the more difficult realization of capacitance voltage balance control.High-voltage large-capacity flexible DC power transmission converter valve based on modular multilevel (MMC) technology; the submodule of required serial connection is up to hundreds of and even thousands of; each submodule must be controlled separately; the valve base control appliance is by adopting the layer and section processing mode that each submodule is controlled separately; temporary location as the valve base control appliance---brachium pontis gathers the unit, is that the submodule information with the whole brachium pontis of a plurality of brachium pontis segmenting units gathers, puts in order, gathers the temporary location that the balance of voltage is processed and brachium pontis Global Macros strategy is implemented.
Current, be applied to more and more the fields such as electric power system, locomotive traction, Aero-Space based on the various Power Electronic Circuit of all-controlling power electronics device IGBT.Along with the development of power electronic technology and material, manufacturing process, the through-current capability of IGBT device is also more and more stronger, makes it also obtain important performance space in the direct current transportation field, has directly promoted birth and the development of Technology of HVDC based Voltage Source Converter.Different from traditional high voltage dc transmission technology, the flexible DC power transmission converter has substituted the Thyristors in series converter valve with the high-voltage commutation valve that is made of the IGBT series connection, has formed the flexible direct current converter of voltage-source type.Flexible DC power transmission can be realized powering to remote middle-size and small-size isolated, weak load; Can carry out independent, accurately, meritorious/Reactive Power Control flexibly, improve economy and the stability of system load flow transmission; Direct voltage polarity is constant when trend is reversed, and conveniently consists of the multi-terminal HVDC transmission system; When linking system short-circuit, do not increase the capacity of short circuit of system, be conducive to limiting short-circuit current, stop the fault pervasion of system; Reactive power support and FREQUENCY CONTROL can be provided, be used for the regenerative resources such as wind energy turbine set and the distributed power generation special advantage that is incorporated into the power networks; Behind the electric network fault that links, can provide the black power supply that starts, the fast restoration capabilities behind the quickening electric network fault; The current conversion station floor space greatly reduces with respect to conventional DC.
The abundant performance advantage of Technology of HVDC based Voltage Source Converter has attracted numerous scientific research technical staff to put into relevant research and has put into practice in the work, its flexibly control performance also so that the control guard method of flexible direct current and control protective unit become the study hotspot of flexible direct current technology.In the control based on the flexible direct current of modularization multi-level converter topological structure, be very important link in the whole control protection system to the control protection of converter submodule inside.The brachium pontis that the present invention is directed to valve base control appliance VBC gathers and has designed the complete and intelligent control protection scheme of a cover, it is reported not yet to see similar correlation technique patent for MMC change of current submodule internal control guard method both at home and abroad at present.
Summary of the invention
For overcoming defects; the invention provides a kind of brachium pontis that is applicable to large capacity MMC flexible DC power transmission system and gather protection system; realized brachium pontis submodule whole complete signaling interface and status monitoring function have been guaranteed submodule reliability of operation and stability.
For achieving the above object; the invention provides a kind of brachium pontis that is applicable to large capacity MMC flexible DC power transmission system and gather protection system; the brachium pontis that is applicable to large capacity MMC flexible DC power transmission system gathers protection system; it is characterized in that, described system comprises: the MMC converter valve, VBC and the station control system that carry out successively data interaction.
In the optimal technical scheme provided by the invention, described MMC converter valve comprises: 400 brachium pontis submodules that connect successively.
In the second optimal technical scheme provided by the invention, described VBC comprises: brachium pontis segmentation control unit, brachium pontis gather control unit, circulation control unit, light CT merging and interface unit and valve monitoring unit; Described brachium pontis segmentation control unit and described MMC converter valve are carried out data interaction; Described brachium pontis gathers control unit and carries out data interaction with described brachium pontis segmentation control unit and described circulation control unit respectively; Described smooth CT merging and interface unit and described valve monitoring unit carry out data interaction with described circulation control unit respectively.
In the 3rd optimal technical scheme provided by the invention, described brachium pontis segmentation control unit comprises: 8 described brachium pontis segmentation modules that carry out respectively data interaction with described MMC converter valve.
In the 4th optimal technical scheme provided by the invention, described brachium pontis gathers control unit, comprising: the balance of voltage control module that is set up in parallel, diagnosing interior faults module, voltage status evaluation module and policy logic module.
In the 5th optimal technical scheme provided by the invention, described balance of voltage control module according to each segmental averaging voltage of described MMC converter valve, is carried out whole submodule voltage-regulation balance.
In the 6th optimal technical scheme provided by the invention, described balance of voltage control module is carried out whole submodule voltage-regulation balance in the mode that sorts or table look-up.
In the 7th optimal technical scheme provided by the invention, described diagnosing interior faults module, communication judgement and oneself state are judged, the communication state between current unit and the brachium pontis segmentation control unit are carried out Real-Time Monitoring; Judge brachium pontis submodule voltage and threshold value, the submodule voltage of uploading by each section and, compare judgement with threshold value, each cross-talk module voltage is regulated; Each cross-talk module bypass count of brachium pontis and whole brachium pontis bypass count compare judgement with threshold values, assessment brachium pontis overall operation state; Wherein, each section of brachium pontis comprises that respectively quantity is less than 60 submodule.
In the 8th optimal technical scheme provided by the invention, described voltage status evaluation module according to the voltage of each brachium pontis submodule with judge whether system is in overvoltage or under-voltage state, according to the grade of plussage regulation fault, is made the protection action.
In the 9th optimal technical scheme provided by the invention, described policy logic module is protected strategy for the malfunction of brachium pontis, carries out respectively conservation treatment with catastrophe failure, generic failure and failure warning.
In the tenth optimal technical scheme provided by the invention, control system in described station comprises: the PCP and the operations staff's work station that is connected with described PCP that carry out data interaction with described VBC.
Compared with the prior art, a kind of brachium pontis that is applicable to large capacity MMC flexible DC power transmission system provided by the invention gathers protection system, realized brachium pontis submodule whole complete signaling interface and status monitoring function have been guaranteed submodule reliability of operation and stability; Configure the complete rational brachium pontis of a cover and gathered the control protection scheme, designed complete bridge arm voltage balance control protected mode, realized the cooperation with whole valve base control appliance control and protection; And, having realized asynchronous serial communication between submodule controller and the higher level's control system, the information interaction amount is large, flexibly mutual and communication speed is fast, has guaranteed the information flow of current conversion station control system integral body; Moreover adopting the DSP+FPGA logic element is core, makes things convenient for the upgrading of function, has reduced the hardware development cost.
Description of drawings
Fig. 1 is the structural representation that the brachium pontis that is applicable to large capacity MMC flexible DC power transmission system gathers protection system.
Embodiment
As shown in Figure 1, a kind of brachium pontis that is applicable to large capacity MMC flexible DC power transmission system gathers protection system, comprising: the MMC converter valve, VBC and the station control system that carry out successively data interaction.
Described MMC converter valve comprises: 400 brachium pontis submodules that connect successively.
Described VBC comprises: brachium pontis segmentation control unit, brachium pontis gather control unit, circulation control unit, light CT merging and interface unit and valve monitoring unit; Described brachium pontis segmentation control unit and described MMC converter valve are carried out data interaction; Described brachium pontis gathers control unit and carries out data interaction with described brachium pontis segmentation control unit and described circulation control unit respectively; Described smooth CT merging and interface unit and described valve monitoring unit carry out data interaction with described circulation control unit respectively.
Light CT merges and the effect of interface unit is to gather the brachium pontis electric current; The valve monitoring unit monitors the state of valve, is to upload host computer, is monitored by operating personnel.
Described brachium pontis segmentation control unit comprises: 8 described brachium pontis segmentation modules that carry out respectively data interaction with described MMC converter valve.
Described brachium pontis gathers control unit, comprising: the balance of voltage control module that is set up in parallel, diagnosing interior faults module, voltage status evaluation module and policy logic module.
Described balance of voltage control module according to each segmental averaging voltage of described MMC converter valve, is carried out whole submodule voltage-regulation balance.
Described balance of voltage control module is carried out whole submodule voltage-regulation balance in the mode that sorts or table look-up.
Described diagnosing interior faults module, communication judgement and oneself state are judged, the communication state between current unit and the brachium pontis segmentation control unit are carried out Real-Time Monitoring; Judge brachium pontis submodule voltage and threshold value, the submodule voltage of uploading by each section and, compare judgement with threshold value, each cross-talk module voltage is regulated; Each cross-talk module bypass count of brachium pontis and whole brachium pontis bypass count compare judgement with threshold values, assessment brachium pontis overall operation state; Wherein, each section of brachium pontis comprises that respectively quantity is less than 60 submodule.
Described voltage status evaluation module according to the voltage of each brachium pontis submodule with judge whether system is in overvoltage or under-voltage state, according to the grade of plussage regulation fault, is made the protection action.
Described policy logic module is protected strategy for the malfunction of brachium pontis, carries out respectively conservation treatment with catastrophe failure, generic failure and failure warning.
Described station control system comprises: the PCP and the operations staff's work station that is connected with described PCP that carry out data interaction with described VBC.
By following examples the brachium pontis that is applicable to large capacity MMC flexible DC power transmission system being gathered protection system is further described.
VBC valve base control appliance structured flowchart as shown in Figure 1; it is processor DSP+ programmable device FPGA that brachium pontis wherein gathers the control unit core; interface comprises the information communication with protocol communication and 8 brachium pontis segmentation control units of circulation unit; the valve information of 8 brachium pontis segmenting units is unified to gather; adopt the balance of voltage strategy of whole brachium pontis; simultaneously, the overall submodule of brachium pontis is carried out unified safety evaluation and the enforcement of protection strategy.
At first,, as object of protection the important parameter of whole brachium pontis is monitored with brachium pontis integral body, assessed with this running status to single brachium pontis, analyze it and whether be in normal condition;
Secondly, each submodule voltage of whole brachium pontis is monitored, by each each submodule maximin of the moment is carried out the threshold values protection, the brachium pontis operation conditions is carried out integral body hold;
The 3rd, other important informations such as bypass situation of whole brachium pontis and each segmentation are carried out Real Time Monitoring, judge brachium pontis submodule operation overall condition with this, guarantee the safe operation of whole brachium pontis submodule;
At last, protect implementation of strategies for the malfunction of brachium pontis, carry out respectively conservation treatment with catastrophe failure, generic failure and failure warning;
The control defencive function that brachium pontis gathers the control realization mainly comprises: by the balance of voltage strategy of each segmentation of brachium pontis, brachium pontis integral body is carried out balance of voltage control 1.; 2. realize and the interface of inner other each unit of VBC, comprise the conversion of output signal, the detection of input signal and the diagnosis of various faults; 3. realize measurement and the overvoltage protection thereof of and each segmentation submodule storage capacitor magnitude of voltage whole to brachium pontis; 4. the control command in conjunction with self-operating state and valve base control realizes that a cover is towards the action prioritization logic of carrying out each segmentation of brachium pontis;
1. brachium pontis integral body is carried out balance of voltage control
By each segmental averaging voltage of brachium pontis integral body, carry out whole submodule voltage-regulation balance in the mode that sorts or table look-up, finish the balance of voltage strategy of submodule;
2. internal interface and failure diagnosis
Communication judgement and oneself state are judged, the communication state between current unit and the brachium pontis segmentation control unit is carried out Real-Time Monitoring, the oneself state of assessment electrical secondary system;
Each cross-talk module voltage of brachium pontis and threshold decision, the submodule voltage of uploading by each section and, compare judgement with threshold value, by Switching Strategy, each cross-talk module voltage is regulated;
Each cross-talk module bypass count of brachium pontis is judged and whole brachium pontis bypass count is judged, compares judgement with threshold values, assessment brachium pontis overall operation state;
3. voltage status assessment
The brachium pontis global voltage and judgement, setting threshold is judged system overvoltage, under-voltage state, according to plussage regulation fault level, makes the corresponding strategy protection, such as subordinate list 1;
| Protected mode | Failure warning | Generic failure | Catastrophe failure |
| Under voltage (crossing threshold value 10%) | √ | ? | ? |
| Under voltage (crossing threshold value 20%) | ? | √ | ? |
| Overvoltage (crossing threshold value 10%) | ? | √ | ? |
| Overvoltage (crossing threshold value 20%) | ? | ? | √ |
| Whole brachium pontis bypass count is too much | ? | ? | √ |
| Each segmentation bypass count is too much | ? | ? | √ |
| Communication failure | ? | √ | ? |
| The valve fault message | ? | ? | √ |
| Transistors breakdown information | ? | ? | √ |
| The by-pass switch fault message | ? | ? | √ |
| System's faults itself | ? | √ | ? |
Table 1
What need statement is that content of the present invention and embodiment are intended to prove the practical application of technical scheme provided by the present invention, should not be construed as the restriction to protection range of the present invention.Those skilled in the art can do various modifications, be equal to and replace or improve inspired by the spirit and principles of the present invention.But these changes or modification are all in the protection range that application is awaited the reply.
Claims (11)
1. a brachium pontis that is applicable to large capacity MMC flexible DC power transmission system gathers protection system, it is characterized in that, described system comprises: the MMC converter valve, VBC and the station control system that carry out successively data interaction.
2. system according to claim 1 is characterized in that, described MMC converter valve comprises: 400 brachium pontis submodules that connect successively.
3. system according to claim 1 is characterized in that, described VBC comprises: brachium pontis segmentation control unit, brachium pontis gather control unit, circulation control unit, light CT merging and interface unit and valve monitoring unit; Described brachium pontis segmentation control unit and described MMC converter valve are carried out data interaction; Described brachium pontis gathers control unit and carries out data interaction with described brachium pontis segmentation control unit and described circulation control unit respectively; Described smooth CT merging and interface unit and described valve monitoring unit carry out data interaction with described circulation control unit respectively.
4. system according to claim 3 is characterized in that, described brachium pontis segmentation control unit comprises: 8 described brachium pontis segmentation modules that carry out respectively data interaction with described MMC converter valve.
5. system according to claim 3 is characterized in that, described brachium pontis gathers control unit, comprising: the balance of voltage control module that is set up in parallel, diagnosing interior faults module, voltage status evaluation module and policy logic module.
6. system according to claim 5 is characterized in that, described balance of voltage control module according to each segmental averaging voltage of described MMC converter valve, is carried out whole submodule voltage-regulation balance.
7. system according to claim 6 is characterized in that, described balance of voltage control module is carried out whole submodule voltage-regulation balance in the mode that sorts or table look-up.
8. system according to claim 5 is characterized in that, described diagnosing interior faults module, and communication judgement and oneself state are judged, the communication state between current unit and the brachium pontis segmentation control unit are carried out Real-Time Monitoring; Judge brachium pontis submodule voltage and threshold value, the submodule voltage of uploading by each section and, compare judgement with threshold value, each cross-talk module voltage is regulated; Each cross-talk module bypass count of brachium pontis and whole brachium pontis bypass count compare judgement with threshold values, assessment brachium pontis overall operation state; Wherein, each section of brachium pontis comprises that respectively quantity is less than 60 submodule.
9. system according to claim 5; it is characterized in that, described voltage status evaluation module is according to the voltage of each brachium pontis submodule with judge whether system is in overvoltage or under-voltage state; according to the grade of plussage regulation fault, make the protection action.
10. system according to claim 5 is characterized in that, described policy logic module is protected strategy for the malfunction of brachium pontis, carries out respectively conservation treatment with catastrophe failure, generic failure and failure warning.
11. system according to claim 1 is characterized in that, control system in described station comprises: the PCP and the operations staff's work station that is connected with described PCP that carry out data interaction with described VBC.
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| CN103368197A (en) * | 2013-07-15 | 2013-10-23 | 国网智能电网研究院 | Valve base control device and method of modularization multi-level converter |
| CN103631235A (en) * | 2013-12-05 | 2014-03-12 | 国家电网公司 | Valve monitor system applicable to high-capacity MMC flexible high-voltage direct-current transmission |
| CN103730880A (en) * | 2013-12-05 | 2014-04-16 | 国家电网公司 | Overvoltage control protection method suitable for MMC flexible direct current submodule |
| CN104007692A (en) * | 2014-06-06 | 2014-08-27 | 南京南瑞继保电气有限公司 | Reserved converter quitting method used after extra-high voltage direct current converter control device breaks down |
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| CN109962473A (en) * | 2017-12-14 | 2019-07-02 | 中电普瑞科技有限公司 | A kind of Control protection system of THE UPFC UPFC |
| WO2021034153A1 (en) * | 2019-08-21 | 2021-02-25 | 효성중공업 주식회사 | Sub-module of power converter including bypass switch |
| US11824462B2 (en) | 2019-08-21 | 2023-11-21 | Hyosung Heavy Industries Corporation | Sub-module of power converter including bypass switch |
| CN110752672A (en) * | 2019-11-01 | 2020-02-04 | 深圳供电局有限公司 | Fault alarm system and method for low-voltage distribution network |
| CN110752672B (en) * | 2019-11-01 | 2022-03-08 | 深圳供电局有限公司 | Fault alarm system and method for low-voltage distribution network |
| CN110749797A (en) * | 2019-11-29 | 2020-02-04 | 中国南方电网有限责任公司超高压输电公司 | Method for judging abnormity of converter valve power module through capacitance state |
| CN110749797B (en) * | 2019-11-29 | 2021-08-20 | 中国南方电网有限责任公司超高压输电公司 | Method for judging abnormity of converter valve power module through capacitance state |
| US20220352810A1 (en) * | 2020-03-26 | 2022-11-03 | Hyosung Heavy Industries Corporation | Control device and control method for modular multilevel converter |
| CN111478289A (en) * | 2020-04-14 | 2020-07-31 | 国家电网有限公司 | Converter valve overvoltage protection method and system |
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