CN103078400B - 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 direct-current transmission converter, be specifically related to a kind of brachium pontis being applicable to Large Copacity MMC flexible direct-current transmission system and gather protection system.
Background technology
Modularization multi-level converter is composed in series by multiple submodule, need to carry out different real-time switchings according to capacitance voltage and submodule operating state to independent submodule to control, level number is more, and real-time control cycle is shorter, and capacitor voltage balance controls more difficult realization.Based on the high-voltage large-capacity flexible direct current transmission converter valve of modular multilevel (MMC) technology; the submodule of required serial connection is up to hundreds of and even thousands of; each submodule must control separately; valve base control appliance controls separately each submodule by adopting layer and section processing mode; as the temporary location of valve base control appliance---brachium pontis collection unit is the temporary location carrying out the submodule information of the whole brachium pontis of multiple brachium pontis segmenting unit to gather, arrange, gather balance of voltage process and the enforcement of brachium pontis Global Macros strategy.
Current, the various Power Electronic Circuit based on all-controlling power electronics device IGBT are applied to the fields such as electric power system, locomotive traction, Aero-Space more and more.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 direct current transportation field, directly facilitates birth and the development of Technology of HVDC based Voltage Source Converter.Different from traditional high voltage dc transmission technology, flexible direct-current transmission converter instead of Thyristors in series converter valve with the high-voltage commutation valve in series by IGBT, defines the flexible direct current converter of voltage-source type.Flexible DC power transmission can realize powering to remote middle-size and small-size isolated, weak load; Independent ,/Reactive Power Control of accurately, flexibly gaining merit can be carried out, improve economy and the stability of system load flow transmission; When trend is reversed, DC voltage polarity is constant, conveniently forms multi-terminal direct current transmission system; Not increasing the capacity of short circuit of system when being connected system short-circuit, being conducive to limiting short-circuit current, stop the fault pervasion of system; Reactive power support and FREQUENCY CONTROL can be provided, have special advantage for the regenerative resource such as wind energy turbine set and distributed power generation is grid-connected; Black starting-up power supply can be provided after the electric network fault that is connected, accelerate the fast restoration capabilities after electric network fault; Current conversion station floor space greatly reduces relative to conventional DC.
The performance advantage that Technology of HVDC based Voltage Source Converter enriches has attracted numerous scientific research technical staff to put in relevant research and practical work, its flexibly control performance also make the Control protection method of flexible direct current and control protective unit become the study hotspot of flexible direct current technology.In the control of the flexible direct current based on modular multi-level converter topological structure, be a very important link in 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 the Control protection scheme devising complete set and intelligence, it is reported and there is not yet the 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 above-mentioned defect; the invention provides a kind of brachium pontis being applicable to Large Copacity MMC flexible direct-current transmission system and gather protection system; achieve the overall complete signaling interface of brachium pontis submodule and status monitoring function, ensure that submodule reliability of operation and stability.
For achieving the above object; the invention provides a kind of brachium pontis being applicable to Large Copacity MMC flexible direct-current transmission system and gather protection system; the brachium pontis being applicable to Large Copacity MMC flexible direct-current transmission system gathers protection system; it is characterized in that, described system comprises: carry out the MMC converter valve of data interaction, VBC and station Ore-controlling Role successively.
In optimal technical scheme provided by the invention, described MMC converter valve, comprising: 400 brachium pontis submodules connected successively.
In second optimal technical scheme provided by the invention, described VBC, comprising: brachium pontis segment control unit, brachium pontis gather control unit, circulation control unit, light CT merging and interface unit and valve monitoring unit; Described brachium pontis segment control unit and described MMC converter valve carry out data interaction; Described brachium pontis gathers control unit and carries out data interaction with described brachium pontis segment control unit and described circulation control unit respectively; Described smooth CT merges and interface unit and described valve monitoring unit carry out data interaction with described circulation control unit respectively.
In 3rd optimal technical scheme provided by the invention, described brachium pontis segment control unit, comprising: 8 described brachium pontis segmentation modules carrying out data interaction respectively with described MMC converter valve.
In 4th optimal technical scheme provided by the invention, described brachium pontis gathers control unit, comprising: the voltage balancing control module be set up in parallel, diagnosing interior faults module, voltage status evaluation module and policy logic module.
In 5th optimal technical scheme provided by the invention, described voltage balancing control module, according to each segmental averaging voltage of described MMC converter valve, carries out overall submodule voltage-regulation balance.
In 6th optimal technical scheme provided by the invention, described voltage balancing control module, carries out overall submodule voltage-regulation balance in the mode sorting or table look-up.
In 7th optimal technical scheme provided by the invention, described diagnosing interior faults module, communication judgement and oneself state judge, carry out Real-Time Monitoring to the communication state between current unit and brachium pontis segment control unit; Judge brachium pontis submodule voltage and threshold value, the submodule voltage uploaded by each section and, compare judgement with threshold value, each cross-talk module voltage regulated; Brachium pontis each cross-talk module bypass number and overall brachium pontis bypass count, compare judgement with threshold values, assessment brachium pontis overall operation state; Wherein, each section of the brachium pontis submodule that comprises quantity respectively and be less than 60.
In 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, specifies the grade of fault, makes protection act according to plussage.
In 9th optimal technical scheme provided by the invention, described policy logic module, the malfunction for brachium pontis carries out Preservation tactics, carries out conservation treatment respectively with catastrophe failure, generic failure and failure warning.
In tenth optimal technical scheme provided by the invention, described station Ore-controlling Role, comprising: the PCP carrying out data interaction with described VBC and the operations staff's work station be connected with described PCP.
Compared with the prior art, a kind of brachium pontis being applicable to Large Copacity MMC flexible direct-current transmission system provided by the invention gathers protection system, achieve the overall complete signaling interface of brachium pontis submodule and status monitoring function, ensure that submodule reliability of operation and stability; Be configured with the rational brachium pontis of complete set and gather Control protection scheme, devise complete bridge arm voltage balance and control protected mode, achieve the cooperation with whole valve base control appliance control and protection; And achieve asynchronous serial communication between submodule controller and higher level's control system, information interaction amount is large, flexibly mutual and communication speed is fast, ensure that the information flow of current conversion station control system entirety; Moreover, adopt DSP+FPGA logic element to be core, facilitate the upgrading of function, reduce hardware development cost.
Accompanying drawing explanation
Fig. 1 is the structural representation that the brachium pontis being applicable to Large Copacity MMC flexible direct-current transmission system gathers protection system.
Embodiment
As shown in Figure 1, a kind of brachium pontis being applicable to Large Copacity MMC flexible direct-current transmission system gathers protection system, comprising: carry out the MMC converter valve of data interaction, VBC and station Ore-controlling Role successively.
Described MMC converter valve, comprising: 400 brachium pontis submodules connected successively.
Described VBC, comprising: brachium pontis segment control unit, brachium pontis gather control unit, circulation control unit, light CT merging and interface unit and valve monitoring unit; Described brachium pontis segment control unit and described MMC converter valve carry out data interaction; Described brachium pontis gathers control unit and carries out data interaction with described brachium pontis segment control unit and described circulation control unit respectively; Described smooth CT merges 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 gathers bridge arm current; Valve monitoring unit, monitors the state of valve, is upload host computer, is monitored by operating personnel.
Described brachium pontis segment control unit, comprising: 8 described brachium pontis segmentation modules carrying out data interaction respectively with described MMC converter valve.
Described brachium pontis gathers control unit, comprising: the voltage balancing control module be set up in parallel, diagnosing interior faults module, voltage status evaluation module and policy logic module.
Described voltage balancing control module, according to each segmental averaging voltage of described MMC converter valve, carries out overall submodule voltage-regulation balance.
Described voltage balancing control module, carries out overall submodule voltage-regulation balance in the mode sorting or table look-up.
Described diagnosing interior faults module, communication judgement and oneself state judge, carry out Real-Time Monitoring to the communication state between current unit and brachium pontis segment control unit; Judge brachium pontis submodule voltage and threshold value, the submodule voltage uploaded by each section and, compare judgement with threshold value, each cross-talk module voltage regulated; Brachium pontis each cross-talk module bypass number and overall brachium pontis bypass count, compare judgement with threshold values, assessment brachium pontis overall operation state; Wherein, each section of the brachium pontis submodule that comprises quantity respectively and be less than 60.
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, specifies the grade of fault, makes protection act according to plussage.
Described policy logic module, the malfunction for brachium pontis carries out Preservation tactics, carries out conservation treatment respectively with catastrophe failure, generic failure and failure warning.
Described station Ore-controlling Role, comprising: the PCP carrying out data interaction with described VBC and the operations staff's work station be connected with described PCP.
Gather protection system by following examples to the brachium pontis being applicable to Large Copacity MMC flexible direct-current transmission system to be 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 control unit core; interface comprises the information communication with the protocol communication of circulation unit and 8 brachium pontis segment control unit; unify to gather to the valve information of 8 brachium pontis segmenting units; adopt the balance of voltage strategy of overall brachium pontis; meanwhile, unified safety evaluation and Preservation tactics enforcement are carried out to the overall submodule of brachium pontis.
First, overall as object of protection using brachium pontis, the important parameter of overall brachium pontis is monitored, assesses with this running status to single brachium pontis, analyze it and whether be in normal condition;
Secondly, each submodule voltage of overall brachium pontis is monitored, by carrying out threshold values protection to each submodule maximin of each moment, entirety being carried out to brachium pontis operation conditions and holds;
3rd, other important informations such as the bypass situation of overall brachium pontis and each segmentation are monitored in real time, judges that brachium pontis submodule runs overall condition, ensures the safe operation of overall brachium pontis submodule with this;
Finally, the malfunction for brachium pontis carries out the enforcement of Preservation tactics, carries out conservation treatment respectively with catastrophe failure, generic failure and failure warning;
The Control protection function that brachium pontis gathers control realization mainly comprises: 1. by the balance of voltage strategy of each segmentation of brachium pontis, carry out voltage balancing control to brachium pontis entirety; 2. realize the interface of other each unit inner with VBC, comprise the diagnosis of the conversion of output signal, the detection of input signal and various faults; 3. realize measurement and the overvoltage protection thereof of and each segmentation submodule storage capacitor magnitude of voltage overall to brachium pontis; 4. the control command controlled in conjunction with self-operating state and valve base realizes a set of action prioritization logic towards performing each segmentation of brachium pontis;
1. brachium pontis entirety carries out voltage balancing control
By each segmental averaging voltage of brachium pontis entirety, carry out overall submodule voltage-regulation balance in the mode sorting or table look-up, complete the balance of voltage strategy of submodule;
2. internal interface and failure diagnosis
Communication judgement and oneself state judge, carry out Real-Time Monitoring to the communication state between current unit and brachium pontis segment control unit, the oneself state of assessment electrical secondary system;
The each cross-talk module voltage of brachium pontis and threshold decision, the submodule voltage uploaded by each section and, compare judgement with threshold value, by Switching Strategy, each cross-talk module voltage regulated;
Brachium pontis each cross-talk module bypass number judges and overall brachium pontis bypass count judges, compares judgement with threshold values, assessment brachium pontis overall operation state;
3. voltage status assessment
Brachium pontis global voltage and judgement, setting threshold, judges system overvoltage, under-voltage state, according to plussage regulation fault level, make corresponding strategy protection, 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%) | √ | ||
| Overall brachium pontis bypass count is too much | √ | ||
| Each segmentation bypass count is too much | √ | ||
| Communication failure | √ | ||
| Valve fault message | √ | ||
| Transistors breakdown information | √ |
| By-pass switch fault message | √ | ||
| System faults itself | √ |
Table 1
It is to be understood that content of the present invention and embodiment are intended to the practical application proving technical scheme provided by the present invention, should not be construed as limiting the scope of the present invention.Those skilled in the art inspired by the spirit and principles of the present invention, can do various amendment, equivalent replacement or improve.But these changes or amendment are all in the protection range that application is awaited the reply.
Claims (7)
1. the brachium pontis being applicable to Large Copacity MMC flexible direct-current transmission system gathers a protection system, it is characterized in that, described system comprises: carry out the modular multilevel controller converter valve of data interaction, valve base controller and station Ore-controlling Role successively;
Described valve base controller, comprising: brachium pontis segment control unit, brachium pontis gather control unit, circulation control unit, optic current transformer merge cells and interface unit and valve monitoring unit; Described brachium pontis segment control unit and described modular multilevel controller converter valve carry out data interaction; Described brachium pontis gathers control unit and carries out data interaction with described brachium pontis segment control unit and described circulation control unit respectively; Described optic current transformer merge cells and interface unit and described valve monitoring unit carry out data interaction with described circulation control unit respectively;
Described brachium pontis segment control unit, comprising: 8 are carried out the brachium pontis segmentation module of data interaction with described modular multilevel controller converter valve respectively;
Described brachium pontis gathers control unit, comprising: the voltage balancing control module be set up in parallel, diagnosing interior faults module, voltage status evaluation module and policy logic module;
Described station Ore-controlling Role, comprising: the pole Control protection system carrying out data interaction with described valve base controller and the operations staff's work station be connected with described pole Control protection system; Unified safety evaluation and Preservation tactics enforcement are carried out to the overall submodule of brachium pontis:
First, overall as object of protection using brachium pontis, the parameter of overall brachium pontis is monitored, assesses with this running status to single brachium pontis, analyze it and whether be in normal condition;
Secondly, each submodule voltage of overall brachium pontis is monitored, by carrying out threshold values protection to each submodule maximin of each moment, entirety being carried out to brachium pontis operation conditions and holds;
3rd, the bypass situation of overall brachium pontis and each segmentation is monitored in real time, judges that brachium pontis submodule runs overall condition with this, ensure the safe operation of overall brachium pontis submodule;
Finally, the malfunction for brachium pontis carries out the enforcement of Preservation tactics, carries out conservation treatment respectively with catastrophe failure, generic failure and failure warning.
2. system according to claim 1, is characterized in that, described modular multilevel controller converter valve, comprising: 400 brachium pontis submodules connected successively.
3. system according to claim 1, is characterized in that, described voltage balancing control module, according to each segmental averaging voltage of described modular multilevel controller converter valve, carries out overall submodule voltage-regulation balance.
4. system according to claim 3, is characterized in that, described voltage balancing control module, carries out overall submodule voltage-regulation balance in the mode sorting or table look-up.
5. system according to claim 1, is characterized in that, described diagnosing interior faults module, and communication judgement and oneself state judge, carry out Real-Time Monitoring to the communication state between current unit and brachium pontis segment control unit; Judge brachium pontis submodule voltage and threshold value, the submodule voltage uploaded by each section and, compare judgement with threshold value, each cross-talk module voltage regulated; Brachium pontis each cross-talk module bypass number and overall brachium pontis bypass count, compare judgement with threshold values, assessment brachium pontis overall operation state; Wherein, each section of the brachium pontis submodule that comprises quantity respectively and be less than 60.
6. system according to claim 1; it is characterized in that, 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; specify the grade of fault according to plussage, make protection act.
7. system according to claim 1, is characterized in that, described policy logic module, and the malfunction for brachium pontis carries out Preservation tactics, carries out conservation treatment respectively with catastrophe failure, generic failure and failure warning.
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Address after: 102209 Beijing City, Changping District science and Technology Park in the future smart grid research institute hospital Co-patentee after: CHINA-EPRI ELECTRIC POWER ENGINEERING Co.,Ltd. Patentee after: GLOBAL ENERGY INTERCONNECTION Research Institute Co-patentee after: DALIAN POWER SUPPLY COMPANY, STATE GRID LIAONING ELECTRIC POWER Co.,Ltd. Co-patentee after: State Grid Corporation of China Address before: 102211 Beijing city Changping District Xiaotangshan town big East Village Road No. 270 (future technology city) Co-patentee before: CHINA-EPRI ELECTRIC POWER ENGINEERING Co.,Ltd. Patentee before: STATE GRID SMART GRID Research Institute Co-patentee before: DALIAN POWER SUPPLY COMPANY OF LIAONING ELECTRIC POWER Co.,Ltd. Co-patentee before: State Grid Corporation of China |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170612 Address after: 102209 Beijing City, Changping District science and Technology Park in the future smart grid research institute hospital Co-patentee after: DALIAN POWER SUPPLY COMPANY, STATE GRID LIAONING ELECTRIC POWER Co.,Ltd. Patentee after: GLOBAL ENERGY INTERCONNECTION Research Institute Co-patentee after: State Grid Corporation of China Address before: 102209 Beijing City, Changping District science and Technology Park in the future smart grid research institute hospital Co-patentee before: CHINA-EPRI ELECTRIC POWER ENGINEERING Co.,Ltd. Patentee before: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE Co-patentee before: DALIAN POWER SUPPLY COMPANY, STATE GRID LIAONING ELECTRIC POWER Co.,Ltd. Co-patentee before: State Grid Corporation of China |