CN103257580A - Overload limit simulation device - Google Patents
Overload limit simulation device Download PDFInfo
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- CN103257580A CN103257580A CN2013101080704A CN201310108070A CN103257580A CN 103257580 A CN103257580 A CN 103257580A CN 2013101080704 A CN2013101080704 A CN 2013101080704A CN 201310108070 A CN201310108070 A CN 201310108070A CN 103257580 A CN103257580 A CN 103257580A
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Abstract
The invention provides an overload limit simulation device, belongs to the field of electrical measurement, and particularly relates to an overload limit simulation test device used for high-voltage direct current transmission equipment in direct current control protection system simulation researches. The device comprises a substractor, a first mode selection switch, a speed limiting device, an integrator, a summator, a second mode selection switch and an inertial element. A polar power control device is connected with the substractor and the summator, the substractor is connected with a neutral current signal end of a thyristor current converter, the substractor is connected with the speed limiting device through the first mode selective switch, the speed limiting device is connected with the summator through the integrator, and the output end of the summator serves as the output end of the polar power control device and is connected with a trigger angle control module of the current converter of a direct current control protection system. The device can truly simulate and reflect operation states of a direct current control protection device and provides corresponding simulation results for researches or design of the direct current control protection device.
Description
Technical field
The invention belongs to the electric measurement field, relate in particular to a kind of overload of studying for the DC control protection system simulation of high-voltage direct-current transmission system and limit simulation testing device.
Background technology
The continuous growth of electricity needs has caused transmission system to develop to the direction of growing distance, big capacity and high stability.Along with the ultra-high voltage AC transmission engineering in each electrical network zone and the construction project of high voltage direct current transmission project constantly increase, the electrical network of power consumption concentrated area presents the extra-high voltage alternating current-direct current series-parallel connection receiving end electrical network feature of tangible many direct currents feed-in, electric network composition is tight, electrical distance is tightr between many ac and dc circuits, behind extra-high voltage and the UHV (ultra-high voltage) fault in ac transmission system, easily cause and comprise high voltage direct current at many interior direct currents while commutation failures, and its rejuvenation of the commutation failure of many times direct currents will produce greater impact to AC system, if the recovery policy mismate of each straight-flow system, then also might cause many direct currents that continuous commutation failure takes place simultaneously, even cause the direct current locking.Many times bipolar locking takes place in direct current simultaneously, and a large amount of trends shift or on a large scale with the initiating system stable problem.Reciprocation between this ac and dc systems brings huge challenge for the safe operation of extra-high voltage alternating current-direct current series-parallel connection receiving end electrical network.
Therefore, in research or the design phase of high voltage direct current transmission project, must test and emulation for the stability of extra-high voltage alternating current-direct current series-parallel connection receiving end electrical network to the reciprocation between ac and dc systems, and with reference to test and simulation result, result to research or design verifies, the stability of system is assessed.China's utility model patent " a kind of many feed-ins DC transmission system real-timedigital simulation model " (utility model patent number: ZL201210532559.X Granted publication number: CN102945004A) disclose many feed-ins DC transmission system real-timedigital simulation model, it comprises the equivalent super high voltage direct current electricity transmission system of a plurality of parallel connections, and described super high voltage direct current electricity transmission system comprises primary system real-timedigital simulation model and electrical secondary system real-timedigital simulation model; Described primary system real-timedigital simulation model comprises current conversion station and DC power transmission line, and described current conversion station is arranged on the two ends of DC power transmission line; Described electrical secondary system real-timedigital simulation model comprises current conversion station control system and protection system, and described current conversion station control system is connected with current conversion station with protection system, is used for the operation of control and protection current conversion station.By control and the protection to the current conversion station operation of current conversion station control system and protection system, avoid easily causing behind the fault in ac transmission system impact that many times direct current simultaneous faultss and many times direct current faults and rejuvenation thereof produce AC system.But this realistic model does not relate to the emulation of overload restriction, truly the overload of simulated high-pressure direct current transportation DC control protection system restriction running status.
Summary of the invention
The objective of the invention is to provide a kind of overload restriction simulator; it can simulate the overload restriction state of reflection D.C. high voltage transmission DC control protection system truly; for the overload of DC control protective device restriction research or design provide corresponding simulation result, solve the technical matters that overload restriction research or design for the DC control protective device provide verification platform.
The present invention solves the problems of the technologies described above the technical scheme that adopts:
A kind of overload restriction simulator is used for the emulation of the DC control protection system of high-voltage direct-current transmission system, and described overload restriction simulator is connected to the input side of the utmost point output control device of DC control protection system, it is characterized in that:
Described overload restriction simulator comprises first to fourth comparer, first with door, second with door, first to the 3rd timer, first mode selection switch and second mode selection switch;
The input end of described first comparer and second comparer is connected respectively to the bound setting value of two hours overload levels, the output terminal of described first comparer and second comparer, be connected respectively to described first with an input end of door; Described first with the door output terminal, by described first timer, be connected to the control end of described first mode selection switch;
The input end of described the 3rd comparer and the 4th comparer is connected respectively to the bound setting value of 3 seconds overload levels, the output terminal of described the 3rd comparer and the 4th comparer, be connected respectively to described second with an input end of door; Described second with the output terminal of door, by second timer and the 3rd timer of series connection successively, be connected to the control end of described second mode selection switch;
Two input ends of described second mode selection switch are connected respectively to first amplitude limit value and second amplitude limit value of current-order; The output terminal of described second mode selection switch is connected to an input end of described first mode selection switch; Another input end of described first mode selection switch is connected to the 3rd amplitude limit value of current-order; The output terminal of described first mode selection switch constitutes the maximum current limit signal end that described overload limits simulator, is connected to the utmost point output control device of DC control protection system.
A kind of preferable technical scheme of overload restriction simulator of the present invention; it is characterized in that described overload restriction simulator comprises that also continuous overload limits module; described continuous overload limits the input end of module; be connected to the transverter trigger angle control module of DC control protection system; described continuous overload limits the output terminal of module; be connected to the utmost point output control device of DC control protection system; current order instruction by restriction utmost point output control device makes the continuous overload of thyristor converter device be no more than 1.05p.u. direct current rated power.
The invention has the beneficial effects as follows:
1. the overload restriction running status of DC control protective device can be simulated, be reflected to overload of the present invention restriction simulator truly, for research or the design of DC control protective device provides corresponding simulation result;
2. overload restriction simulator of the present invention has the advantage of cross-platform emulation testing, both can realize with actual components in true environment, can realize with computer software in virtual environment again;
Description of drawings
Fig. 1 is the circuit theory diagrams for the simulator of DC control protection system;
Fig. 2 is the circuit theory diagrams of overload restriction simulator of the present invention.
The label of each parts among the above figure: 100-high-voltage direct-current transmission system; 110-alternating current filter switching device; the 120-converter power transformer; 130-thyristor converter device; the 200-control module; 210-angle, current/voltage reference value calculation element; 220-transverter trigger angle control device; 230-trigger pulse generation device, 240-change of current variation apparatus for controlling connection, 250-utmost point output control device; the 260-overload control apparatus; 270-Reactive Power Control device, 300-dc system protection unit, 900-operation control workstation.2611～2614-, first to fourth comparer, 2621-first and door, 2622-second and door, 2631～2633-, first to the 3rd timer, 2641-first mode selection switch, 2642-second mode selection switch, MAXCUR-maximum current limit signal end.
Embodiment
In order to understand technique scheme of the present invention better, be explained in further detail below in conjunction with drawings and Examples.
Fig. 2 has showed an embodiment of overload restriction simulator of the present invention; be used for the emulation of the DC control protection system of high-voltage direct-current transmission system, overload restriction simulator 260 is connected to the input side of the utmost point output control device 250 of DC control protection system.The simulator of the DC control protection system of high-voltage direct-current transmission system as shown in Figure 1.
As shown in Figure 2, overload restriction simulator of the present invention comprises first to fourth comparer 2611～2614, first and door 2621, the second and door 2622, first to the 3rd timer 2,631～2632, first mode selection switch 2641 and second mode selection switch 2642;
The input end of first comparer 2611 and second comparer 2622 is connected respectively to the bound setting value of two hours overload levels, the output terminal of first comparer 2611 and second comparer 2622, be connected respectively to first with an input end of door 2621; First with door 2621 output terminal, by first timer 2631, be connected to the control end of first mode selection switch 2641;
The input end of the 3rd comparer 2613 and the 4th comparer 2614 is connected respectively to the bound setting value of 3 seconds overload levels, the output terminal of the 3rd comparer 2613 and the 4th comparer 2614, be connected respectively to second with an input end of door 2622; Second with door 2622 output terminal, by second timer 2632 and the 3rd timer 2 633 of series connection successively, be connected to the control end of second mode selection switch 2642;
Two input ends of second mode selection switch 2642 are connected respectively to first amplitude limit value and second amplitude limit value of current-order; The output terminal of second mode selection switch 2642 is connected to an input end of first mode selection switch 2641; Another input end of first mode selection switch 2641 is connected to the 3rd amplitude limit value of current-order; The output terminal of first mode selection switch 2641 constitutes the maximum current limit signal end MAXCUR that overload limits simulator 260, is connected to the utmost point output control device 250 of DC control protection system.
Another embodiment according to overload restriction simulator of the present invention; overload restriction simulator 260 also comprises and comprises that also continuous overload limits the module (not shown); described continuous overload limits the input end of module; be connected to the transverter trigger angle control module of DC control protection system; described continuous overload limits the output terminal of module; be connected to the utmost point output control device of DC control protection system; current order instruction by restriction utmost point output control device makes the continuous overload of thyristor converter device be no more than 1.05p.u. direct current rated power.
The operational process of overload restriction simulator of the present invention is as follows:
Overload restriction is under current environmental temperature and valve temperature conditions, considers whether standby cooling device is available, according to the minimum value of the intrinsic capability of overload at two stations the current-order of utmost point power/current control output is carried out amplitude limit.The principle of overload restriction is to make the whole capability of overloads of primary circuit under various operating modes all be fully utilized, and also can undesirable stoppage in transit not take place because equipment surpasses ability simultaneously.
The direct current capability of overload comprises: overload in short-term, overload continuously.Capability of overload refers to the overload level in 3 seconds or 2 hours in short-term.Under RTDS control protection system, following condition is considered in the system's restriction of overload in short-term control:
1) according to the difference of current overload current value, has different running overloads and allow the time.
2) according to the difference of time of current running overload, has different capability of overloads in short-term.
3) overload is continuously having under the redundant cooling condition, and capability of overload is 1.05p.u. direct current rated power continuously.
Those of ordinary skill in the art will be appreciated that; above embodiment illustrates technical scheme of the present invention; and be not to be used as limitation of the invention; any variation, modification of the above embodiment being done based on connotation of the present invention all will drop in the protection domain of claim of the present invention.
Claims (2)
1. an overload restriction simulator is used for the emulation of the DC control protection system of high-voltage direct-current transmission system, and described overload restriction simulator is connected to the outgoing side of the utmost point output control device of DC control protection system, it is characterized in that:
Described overload restriction simulator comprises subtracter, first mode selection switch, speed limiting device, integrator and totalizer;
The current command signal of described utmost point output control device is connected to the in-phase input end of described subtracter, and is connected to an input end of described totalizer, and the inverting input of described subtracter is connected to the neutral current signal end of thyristor converter device;
The output terminal of described subtracter is connected to the input end of described speed limiting device by first mode selection switch; The output terminal of described speed limiting device is connected to another input end of totalizer by integrator;
The output terminal of described totalizer is connected to the transverter trigger angle control module of DC control protection system as the output terminal of utmost point output control device.
2. overload according to claim 1 limits simulator, it is characterized in that described overload restriction simulator also comprises second mode selection switch and inertance element, the input end of described inertance element selects to be connected to corresponding compensating coefficient setting value by described second mode selection switch; The output terminal of described inertance element is connected to described integrator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310108070.4A CN103257580B (en) | 2013-03-29 | 2013-03-29 | Overload limit simulation device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310108070.4A CN103257580B (en) | 2013-03-29 | 2013-03-29 | Overload limit simulation device |
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| CN103257580A true CN103257580A (en) | 2013-08-21 |
| CN103257580B CN103257580B (en) | 2015-07-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105978014A (en) * | 2016-06-08 | 2016-09-28 | 南京南瑞继保电气有限公司 | Fault locking method under communication abnormity between parallel connection converter DC power stations |
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| WO2007033620A1 (en) * | 2005-09-22 | 2007-03-29 | Siemens Aktiengesellschaft | Control method for transmitting direct current |
| CN101281463A (en) * | 2007-12-24 | 2008-10-08 | 国网直流工程建设有限公司 | High voltage direct current transmission, extra-high voltage direct current transmission general-purpose control model developing method |
| CN102721900A (en) * | 2012-06-13 | 2012-10-10 | 珠海许继电气有限公司 | Method for detecting operation fault direction of distribution network |
| CN203101859U (en) * | 2013-03-29 | 2013-07-31 | 国家电网公司 | Overload limit simulating device |
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2013
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003061264A (en) * | 2001-08-07 | 2003-02-28 | Korea Electric Power Data Network Co Ltd | Load monitoring system of transformer on utility pole using wireless internet |
| CN2798109Y (en) * | 2005-01-12 | 2006-07-19 | 广凌科技股份有限公司 | Automatic DC power tester |
| WO2007033620A1 (en) * | 2005-09-22 | 2007-03-29 | Siemens Aktiengesellschaft | Control method for transmitting direct current |
| CN101281463A (en) * | 2007-12-24 | 2008-10-08 | 国网直流工程建设有限公司 | High voltage direct current transmission, extra-high voltage direct current transmission general-purpose control model developing method |
| CN102721900A (en) * | 2012-06-13 | 2012-10-10 | 珠海许继电气有限公司 | Method for detecting operation fault direction of distribution network |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105978014A (en) * | 2016-06-08 | 2016-09-28 | 南京南瑞继保电气有限公司 | Fault locking method under communication abnormity between parallel connection converter DC power stations |
| CN105978014B (en) * | 2016-06-08 | 2018-09-28 | 南京南瑞继保电气有限公司 | Parallel inverter direct current transportation interior communication descends failure locking method extremely |
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| CN103257580B (en) | 2015-07-01 |
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