CN101383494A - DC control protection method for line ice melting of extra-high voltage DC transmission system - Google Patents
DC control protection method for line ice melting of extra-high voltage DC transmission system Download PDFInfo
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- CN101383494A CN101383494A CNA2008101548963A CN200810154896A CN101383494A CN 101383494 A CN101383494 A CN 101383494A CN A2008101548963 A CNA2008101548963 A CN A2008101548963A CN 200810154896 A CN200810154896 A CN 200810154896A CN 101383494 A CN101383494 A CN 101383494A
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Abstract
The invention relates to a direct-current controlling and protecting method for the ice-melting of an ultra high voltage direct current transmission line. For an once connection mode for the ice-melting of two parallel current converters, the control strategies and methods that two current converters at the rectification side are used for setting the electric current, and one of two current converters at the inversion side is used for setting the electric current, and the other one thereof is used for setting the voltage are adopted so as to ensure that an ultra high voltage direct current system can continuously and stably operates in an ice-melting operating mode. The currentration of each current converter at the rectification side is one half of the input ice-melting current instruction value and is one half of the currentration tracing line current measured value of the current converter used for setting the electric current at the inversion side, thereby the even distribution of the direct current between two current converters at the inversion side can be ensured, and the current converter used for setting the voltage at the inversion side is used for controlling the direct-current voltage of the parallel current converters.
Description
Technical field
The present invention relates to the DC control protection method of line ice melting of extra-high voltage DC transmission system; more particularly; the present invention is in conjunction with the characteristics of extra-high voltage direct-current converter ice-melt in parallel, and relating to extra-high voltage direct-current control protection system is to satisfy control protection strategy and the method that the line ice-melting requirement is adopted.
Background technology
The safe operation of transmission line icing in winter serious threat electric power system.Increased ice load on the lead, all can bring certain machinery and electrical damage to lead, iron tower and gold utensil, can cause tripping operation, broken string when icing is serious, fall shaft tower, the accident that causes power failure causes heavy losses to national economy.
The heating de-icing technology is that direct current is injected transmission line, reaches the effect of ice-melt by making the circuit heating, and the key of this technology is the direct current that will provide very big, will reach the requirement of minimum ice melting current at least.For the transmission line of alternation current,, form the power rectifier loop and realize ice-melt at present by changing the topological structure of reactive-load compensator SVC; For DC power transmission line, then adopt the converter parallel connection that big DC line electric current is provided.
The extra high voltage direct current transmission line fed distance is far away, middle need to cross over a plurality of easy zones of sending out the icing disaster serious, therefore study extra-high voltage direct-current engineering de-icing technology to improving the reliability of extra-high voltage DC transmission system, ensure that its safe and stable operation is significant.
The characteristics of extra-high voltage DC transmission system are that every end current conversion station has 4 12 pulse conversion devices, are divided into the two poles of the earth, two converter series connection of every utmost point, and the typical every utmost point of extra-high voltage DC transmission system provides 800kV direct voltage, and the DC line electric current is 4000A, as shown in Figure 1.But according to 6 * 720mm that the ultra high voltage engineering is adopted
2The research of lead, the minimum ice melting current of extra high voltage direct current transmission line is about 8000～9000A.Existing extra-high voltage direct-current primary system result of study shows, current conversion station increases a small amount of connecting line and isolating switch at the two ends of extra-high voltage direct-current transmission engineering, respective switch by the dc switch field is divided closing operation, make the conventional primary connection mode of the every utmost point two converters series connection switch to 2 converters (Fig. 2) of one pole or bipolar 2 converter parallel connections (Fig. 3), the DC line electric current of 8000A can be provided under specified situation like this, consider the capability of overload of converter, the highest ice melting current that provides above 9000A.
The research of line ice melting of extra-high voltage DC transmission system at present mainly concentrates on primary system design aspects such as converter series-parallel system, and its DC control protection research tactful and method also is in the starting stage.
Summary of the invention
The objective of the invention is: the DC control protection method that proposes line ice melting of extra-high voltage DC transmission system; increase necessary connecting line and isolating switch at extra-high voltage direct-current current conversion station primary system; current conversion station is possessed from normal series wiring to switch under the condition of ice-melt and tie; make extra-high voltage direct-current control protection system increase the ice-melt controlled function; ice melting current continuous controllable, and the smooth conversion between realization normal operation mode and the ice-melt working method.
Technical scheme of the present invention is:
Be provided with the respective straight Flow Line and the switch of ice-melting mode at the two ends of extra-high voltage DC transmission system current conversion station, by the branch closing operation of respective switch, the conventional primary connection mode that two converters of every utmost point are connected switches to two converters or two bipolar converter parallel connections of one pole.
The ice-melt mode of connection for two converter parallel connections, adopt two converters of rectification side parallel connection to decide that electric current, one of two converter of inversion side are decided electric current, another decides the control strategy and the method for voltage, makes the extra-high voltage direct-current system can run on the ice-melt working method continuously and stably.
Under the ice-melt working method, two converters in parallel are independently control separately.Two converters of rectification side parallel connection all are in decides current status, under rated condition, provides the 4000A electric current separately, parallel connection direct voltage 400kV, and the DC line electric current is 8000A, during overload, can reach 9000A.One of two converter of inversion side are in decides current status, and another is in decides voltage status.Be in the converter current ration of deciding current status and follow the tracks of half of DC line electric current, make inversion side two converter mean allocation direct currents; Decide the direct voltage of the converter control parallel inverter of voltage status.Because the both sides converter all is and tie, single converter is decided voltage can guarantee that fully the voltage of all converters all can remain near the definite value.
The present invention makes amendment to the part software function module of extra-high voltage direct-current control protection system, increases the specific function of these modules under ice-melting mode.The feature of these modifications is original function not to be done any change, when just all functions require under satisfying extra-high voltage direct-current engineering routine work mode, direct current system is transformed under the ice-melt working method moves.
The invention has the beneficial effects as follows: the present invention makes extra-high voltage direct-current control protection system increase the ice-melt controlled function, the ice melting current continuous controllable, and can realize smooth conversion between normal operation mode and the ice-melt working method.The extra-high voltage direct-current system constantly all is in stable working point in all of ice-melt work, the ice-melt load that control strategy has guaranteed rectification and inversion both sides all between the converter of parallel connection by mean allocation, can not cause the serious overload of single converter.
The present invention is applicable to the various converters of the extra-high voltage direct-current ice-melt mode of connection in parallel, includes but not limited to the in parallel and bipolar two converter parallel connections of one pole two converters.
Description of drawings
Fig. 1 is the extra-high voltage DC transmission system main wiring diagram;
Fig. 2 is extra-high voltage direct-current ice-melt one pole two converters winding diagrams in parallel;
Fig. 3 is bipolar two converters of extra-high voltage direct-current ice-melt winding diagrams in parallel;
Fig. 4 is a converter current-order program circuit schematic diagram;
Fig. 5 is extra-high voltage direct-current utmost point control protection system Organization Chart;
Fig. 6 is the control protection system Organization Chart under the one pole two valve groups ice-melt scheme in parallel;
Fig. 7 is the control protection system Organization Chart under the bipolar two valve groups ice-melt scheme in parallel.
Reference numeral: C1, C2, C3, C4 converter, R1, R2, R3, R4 smoothing reactor, Q1～Q22 switch or isolating switch; The bipolar control flow of BCP, the bipolar protection screen of BP, PCP utmost point control flow, PP utmost point protection screen, CCP converter control screen, CP converter unit protection screen.
Embodiment
The primary connection scheme of line ice melting of extra-high voltage DC transmission system has one pole two converters and tie and bipolar two converters and tie etc.; be example with one pole two converters connection plan in parallel below, the execution mode of extra-high voltage direct-current line ice-melting control guard method among the present invention is described.
The framework of extra-high voltage direct-current utmost point control protection system is divided into bipolar key-course, utmost point key-course and three level of converter control layer as shown in Figure 5, and bipolar key-course comprises BCP screen and BP screen; Utmost point key-course comprises PCP screen and PP screen; The converter control layer comprises CCP screen and CP screen.The control defencive function of extra-high voltage direct-current is realized by a series of software function modules that are distributed in each layer control protection screen.The present invention is by increasing the program of ice-melt working method in following functional module, make the extra-high voltage direct-current system after receiving the ice melting operation instruction, can change the mode of connection smoothly, decide according to rectification side two converters that electric current, one of inversion side two converter are decided electric current, an ice-melt control strategy of deciding voltage runs on the ice-melt operating state:
(1) in converter control CCP, two valve groups are independently control separately.Voltage control mode is decided in one of them converter employing to the inversion side; Another converter adopts decides current control mode.Two converters of rectification side adopt decides current control mode.
(2) each converter current ration of rectification side for the input the ice melting current command value 1/2nd, make the ice melting current continuous controllable; Half of line current measured value adopted in the instruction of inversion side Current Control converter, and the electric current converter of deciding by the inversion side distributes direct current.Program circuit as shown in Figure 4, LEAD be 1 the expression converting plant, be 0 the expression Inverter Station; OPN_A, OPN_B are that two converters representing parallel connection at 1 o'clock respectively are in the ice melting operation state; IDL_PPC is the actual measurement line current; IO_LIMITED determines according to 1/2nd of the ice melting current command value of importing.Program obtains the current-order IO_PERFORMANCE of converter by selector, and the logic of selector is: when NLEAD was 1, IO_PERFORMANCE got IDL_C; When NLEAD was 0, IO_PERFORMANCE got IO_LIMITED.IO_PERFORMANCE is sent among the CCP, is used to calculate the reference value of deciding current controller.
(3) rectification side and inversion lateral root calculate the DC line voltage drop according to the product of two converter electric current sums and line resistance, and then calculate the direct voltage reference value of rectification side and inversion side converter.
(4) the switch yard sequential control logic of increase ice-melting mode wiring, with Fig. 2 is example, increase along the control program, elder generation closed Q21, Q5, Q8, Q18, close neutral bus metallic return respective switch converter C2 is changed over to the metallic return mode, closed again Q22, Q1, Q19, the ice-melt mode of connection in parallel of realization C1 and C2 converter.
(5) other correlation function module comprises: in utmost point control PCP, increase ice-melt mode control; Idle control increases the filter switching control that adapts with ice-melting mode; The change of current variation joint control that increase and ice-melting mode adapt etc.
The control protection screen that above-mentioned module relates to shows with gray background in Fig. 6.
The present invention only increases the ice-melt software function on the routine control defencive function basis of extra-high voltage direct-current control protection system; implementation method is fairly simple; little to the adjustment of original DC control protection system; do not need to increase new secondary screen cabinet or device; do not need to roll up the communication of control protective device yet, can realize extra-high voltage direct-current control protection system the ice-melt working method and with the conversion of routine work mode.
Ice-melt control guard method of the present invention also is applicable to other mode of connection of extra-high voltage direct-current converter ice-melt in parallel; for example for bipolar two converters scheme in parallel; the software module that the control strategy of two ends converter employing and needs increase the ice-melt function is identical when in parallel with one pole two converters; just since two converters in parallel from the different utmost points; two interpolars need transmit data such as operational mode, power and current-order, need to increase interpolar and interlayer exchanges data amount.The control protection screen that the ice-melt in parallel of bipolar two converters relates to shows with gray background in Fig. 7.
Claims (3)
1, a kind of DC control protection method of extra high voltage direct current transmission line ice-melt; it is characterized in that: for the ice-melt primary connection mode of two converter parallel connections; adopt two converters of rectification side to decide that electric current, one of two converter of inversion side are decided electric current, another decides the control strategy and the method for voltage, makes the extra-high voltage direct-current system can run on the ice-melt working method continuously and stably.
2, the DC control protection method of extra high voltage direct current transmission line ice-melt as claimed in claim 1, the current ration that it is characterized in that each converter of rectification side is 1/2nd of an ice melting current command value.
3, as the DC control protection method of claim 1 and 2 described extra high voltage direct current transmission line ice-melts, the current ration of deciding the electric current converter that it is characterized in that the inversion side is followed the tracks of half of circuit current measurement value, reaches the purpose of direct current mean allocation between inversion side two converters; The inversion side decide the direct voltage that the voltage converter is then controlled parallel inverter because converter and tie, single converter is decided the strategy of voltage and is guaranteed that the voltage of all converters all can be stabilized near the definite value.
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| CNA2008101548963A CN101383494A (en) | 2008-10-17 | 2008-10-17 | DC control protection method for line ice melting of extra-high voltage DC transmission system |
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| CNA2008101548963A CN101383494A (en) | 2008-10-17 | 2008-10-17 | DC control protection method for line ice melting of extra-high voltage DC transmission system |
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| CN102510039A (en) * | 2011-11-09 | 2012-06-20 | 南方电网科学研究院有限责任公司 | Automatic switching circuit for multi-functional direct current ice melting and switching method thereof |
| CN103326300A (en) * | 2013-06-18 | 2013-09-25 | 国家电网公司 | Power-failure-free direct-current deicing device |
| CN103647243A (en) * | 2013-12-17 | 2014-03-19 | 国家电网公司 | Method and device for deicing direct current transmission line of extra-high-voltage direct current project |
| WO2014146241A1 (en) * | 2013-03-19 | 2014-09-25 | Abb Technology Ltd. | Bipolar universal converter station and mtdc system thereof |
| CN104600738A (en) * | 2015-01-21 | 2015-05-06 | 南京南瑞继保电气有限公司 | Control device for high-voltage DC transmission series valve set |
| CN104714138A (en) * | 2015-04-10 | 2015-06-17 | 国家电网公司 | Current and voltage rise testing system for ultra-high voltage direct-current deicing device |
| WO2015139443A1 (en) * | 2014-03-19 | 2015-09-24 | 许继集团有限公司 | Method of metal return longitudinal differential protection in parallel ice-melting mode |
| CN105790249A (en) * | 2014-12-14 | 2016-07-20 | 南京南瑞继保电气有限公司 | Voltage and current control method and system of extra-high voltage DC transmission system |
| CN106208167A (en) * | 2016-08-31 | 2016-12-07 | 南京南瑞继保电气有限公司 | A kind of parallel high voltage DC power transmission control system valve group control mode switch method |
| CN106329557A (en) * | 2015-07-07 | 2017-01-11 | 南京南瑞继保电气有限公司 | Control apparatus, system and method for multi-pole flexible direct current power transmission system |
| CN107643722A (en) * | 2017-11-06 | 2018-01-30 | 南京力通达电气技术有限公司 | Extra-high voltage converter cooler redundancy control system and its method |
| CN113471918A (en) * | 2021-06-28 | 2021-10-01 | 南京南瑞继保电气有限公司 | Ice melting circuit of extra-high voltage direct current transmission system and control method and control device thereof |
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- 2008-10-17 CN CNA2008101548963A patent/CN101383494A/en active Pending
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| CN102510039B (en) * | 2011-11-09 | 2014-10-01 | 南方电网科学研究院有限责任公司 | Automatic switching circuit for multi-functional direct current ice melting and switching method thereof |
| WO2013067754A1 (en) * | 2011-11-09 | 2013-05-16 | 南方电网科学研究院有限责任公司 | Multi-functional direct current ice melting automatic switching circuit and switching method thereof |
| US9972988B2 (en) | 2011-11-09 | 2018-05-15 | Electric Power Research Institute, China Southern Power Grid | Multi-functional direct current ice melting automatic switching circuit and switching method thereof |
| CN102510039A (en) * | 2011-11-09 | 2012-06-20 | 南方电网科学研究院有限责任公司 | Automatic switching circuit for multi-functional direct current ice melting and switching method thereof |
| CN104508933A (en) * | 2013-03-19 | 2015-04-08 | Abb技术有限公司 | Bipolar Universal Converter Station And Mtdc System Thereof |
| WO2014146241A1 (en) * | 2013-03-19 | 2014-09-25 | Abb Technology Ltd. | Bipolar universal converter station and mtdc system thereof |
| CN104508933B (en) * | 2013-03-19 | 2017-11-28 | Abb技术有限公司 | The universal current conversion station of bipolarity and its MTDC systems |
| CN103326300A (en) * | 2013-06-18 | 2013-09-25 | 国家电网公司 | Power-failure-free direct-current deicing device |
| CN103326300B (en) * | 2013-06-18 | 2016-03-02 | 国家电网公司 | One does not have a power failure DC de-icing device |
| CN103647243A (en) * | 2013-12-17 | 2014-03-19 | 国家电网公司 | Method and device for deicing direct current transmission line of extra-high-voltage direct current project |
| CN103647243B (en) * | 2013-12-17 | 2016-03-16 | 国家电网公司 | A kind of de-icing method of direct current transmission line of extra-high-voltage direct current project and device |
| WO2015139443A1 (en) * | 2014-03-19 | 2015-09-24 | 许继集团有限公司 | Method of metal return longitudinal differential protection in parallel ice-melting mode |
| CN105790249A (en) * | 2014-12-14 | 2016-07-20 | 南京南瑞继保电气有限公司 | Voltage and current control method and system of extra-high voltage DC transmission system |
| CN105790249B (en) * | 2014-12-14 | 2018-05-22 | 南京南瑞继保电气有限公司 | A kind of voltage of extra-high voltage DC transmission system, current control method and system |
| CN104600738A (en) * | 2015-01-21 | 2015-05-06 | 南京南瑞继保电气有限公司 | Control device for high-voltage DC transmission series valve set |
| CN104714138A (en) * | 2015-04-10 | 2015-06-17 | 国家电网公司 | Current and voltage rise testing system for ultra-high voltage direct-current deicing device |
| CN104714138B (en) * | 2015-04-10 | 2016-03-09 | 国家电网公司 | Extra-high voltage direct-current deicing device up-flow pressure build-up test system |
| CN106329557A (en) * | 2015-07-07 | 2017-01-11 | 南京南瑞继保电气有限公司 | Control apparatus, system and method for multi-pole flexible direct current power transmission system |
| CN106329557B (en) * | 2015-07-07 | 2018-10-16 | 南京南瑞继保电气有限公司 | Control device, the system and method for multipole flexible direct current power transmission system |
| CN106208167A (en) * | 2016-08-31 | 2016-12-07 | 南京南瑞继保电气有限公司 | A kind of parallel high voltage DC power transmission control system valve group control mode switch method |
| CN106208167B (en) * | 2016-08-31 | 2018-11-13 | 南京南瑞继保电气有限公司 | A kind of parallel high voltage DC power transmission control system valve group control mode switch method |
| CN107643722A (en) * | 2017-11-06 | 2018-01-30 | 南京力通达电气技术有限公司 | Extra-high voltage converter cooler redundancy control system and its method |
| CN107643722B (en) * | 2017-11-06 | 2024-04-05 | 南京力通达电气技术有限公司 | Redundancy control method for extra-high voltage converter transformer cooler |
| CN113471918A (en) * | 2021-06-28 | 2021-10-01 | 南京南瑞继保电气有限公司 | Ice melting circuit of extra-high voltage direct current transmission system and control method and control device thereof |
| CN113471918B (en) * | 2021-06-28 | 2022-12-13 | 南京南瑞继保电气有限公司 | Ice melting circuit of extra-high voltage direct-current transmission system and control method and control device thereof |
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