CN102496924B - Modeling method and system for correcting and predicting arc extinguishing angle - Google Patents
Modeling method and system for correcting and predicting arc extinguishing angle Download PDFInfo
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Abstract
The invention discloses a modeling method and a system for correcting and predicting an arc extinguishing angle. The modeling method includes the following steps: firstly constructing a main circuit of a direct current system in simulation software power system computer aided design/electromagnetic transients including DC (PSCAD/EMTDC), and establishing a control model in an inversion side control circuit by adopting the modeling method for correcting and predicting the arc extinguishing angle. The modeling method is verified by adopting a yingdong +-660kV direct current system model, and results show correctness of the modeling method. The modeling method and the system for correcting and predicting the arc extinguishing angle can solve the problem that the arc extinguishing angle cannot be measured actually, and guarantees that an inversion side control curve is a positive slope curve. The modeling method is simple and practical, can well simulate and study dynamic property service of the direct current system, and is an essential condition for detailed modeling of the direct current system which cannot measure the arc extinguishing angle actually.
Description
Technical field
The present invention relates to a kind of predicting arc extinguishing angle method and system.Relate in particular to a kind of correction predicting arc extinguishing angle modeling method and system.
Background technology
The direct current system dynamic characteristic is the emphasis that DC engineering is paid close attention to for a long time always, and along with the DC engineering scale is increasing, the direct current transmission capacity is more and more higher, and its importance highlights day by day.HVDC dynamic characteristics analysis content is extremely extensive, and the research of all DC side can be included, and wherein each aspect is worth carrying out separately careful research.According to the structure of direct current system, from system perspective, the research direction relevant to electromagnetic transient can be summarized as:
1. the Sub-synchronous Resonance that causes of direct current transportation;
2. the self-excitation problem of the generator that is connected with current conversion station;
3. the equivalent problem of AC system that is used for electromagnetic transient simulation;
4. under different AC system intensity and different AC fault, the response problem of direct current system;
5. the saturated and magnetic bias problem of transformer;
6. the ferro resonance problem of converter transformer;
7. the harmonic wave and the low order resonance problems that cause of direct current transportation;
8. the temporary overvoltage at direct-current transmission converter station (TOV) problem;
9. the specificity analysis of direct-current power transmission control protection system and newly control strategy;
10. DC transmission system fault response characteristics and fault recovery problem;
11. the commutation failure of commutation failure and multi-infeed HVDC transmission of electricity;
12. direct current transmission line fault and with the electromagnetic coupled of alternating current circuit;
13. the communication interference problem of direct current transportation.
Above research all belongs to the direct current transportation dynamic analysis, between each problem and dependent, but interrelated.As mentioned above, each problem be worth to drop into energy and goes further investigation, and for above research topic, and engineering circles or academia be relating to more or less all, but because focal point is different separately, therefore concrete research contents and method also there are differences.
No matter direct current system or AC system, fault is inevitable.And the response characteristic at different faults subinverse transform stream station also there are differences.For example, the AC three-phase fault causes change of current busbar voltage to be fallen, and the large young pathbreaker of earth resistance has influence on the amplitude that voltage falls, thereby has determined whether Inverter Station commutation failure can occur, and commutation failure will directly cause the interruption of direct current transmission power; Single phase ground fault can cause not only that voltage copies and fall, and simultaneously because three-phase is asymmetric, its zero crossing skew also can cause the commutation process of direct current to be affected.Under the fault of same-type, again can be because of the difference of AC system power, also there is very big-difference in the characteristic of the direct current system that connects.Fault itself can't be avoided, and how to avoid dc system fault important undoubtedly, but how to make direct current system recover from fault fast, thereby recovers power delivery, is equally also the problem that people pay close attention to always.
For emulation technology, electric system simulation can be divided into electromechanical transient simulation and two large classes of electromagnetic transient simulation as previously mentioned, and all there are very big-difference in its research purpose and modeling method.Electromechanical transient simulation generally adopts PSS/E or BPA, and its focus is the transient stability of large electrical network, can also not need direct current system is carried out careful engineering simulation.And to carry out specificity analysis as direct current transportation or FACTS to containing the system of power electric component, must rely on the electromagnetic transient simulation analysis.ABB and SIEMENS once attempted to adopt a kind of software to cover electromechanical transient and electromagnetic transient simulation, but because technology and other reasons are finally abandoned this route, then use PSS/E to carry out electromechanical transient simulation, use PSCAD/EMTDC to carry out electromagnetic transient simulation.
PSCAD/EMTDC,, as a the Summary of Power System Simulation Software, obtained the approval of whole world engineering circles, and especially it is taken the course of its own especially in processing power electric component field.Except utilizing PSCAD/EMTDC to carry out emulation, the direct current system Research on Dynamic Characteristic also can be carried out real-time simulation by means of RTDS.Undoubtedly, RTDS emulation is more actual close to engineering, but its hardware investment is very large, and general run unit and school are difficult to possess experiment condition.
Therefore adopting PSCAD/EMTDC to the direct current system modeling and simulating, is an important method of its electro-magnetic transient characteristic of research.The core of direct current system is control system, and adopt of rectification side control system determined Current Control more usually, and inversion side control system control mode is more, mainly contains and determines gamma kick and determine voltage control etc.This dual mode respectively has pluses and minuses, determines gamma kick and can keep constant extinguish angle, effectively prevents commutation failure, determines voltage control and can stablize combined-voltage, effectively prevents voltage collapse or promotes false voltage to recover.The most domestic direct current system can be according to reality according to these two kinds of control mode modelings in PSCAD/EMTDC.It is not a production of units due to its converter valve and control system that but some direct current systems (as silver-colored east ± 660kV direct current system) are also arranged, not mating to a certain degree, appear, cause and can't survey extinguish angle, this just is difficult to adopt determines gamma kick, and inversion top-cross streaming system is comparatively stable, it is also bad that the voltage control effect is determined in employing, so need a kind of new control mode, predicting arc extinguishing angle control mode that Here it is, be decided to be positive slope but adopt this mode inversion side gamma kick curve to differ, be unfavorable for the stable of system.
Summary of the invention
Purpose of the present invention, exactly for addressing the above problem, proposes a kind of correction predicting arc extinguishing angle modeling method and system, and it can be the direct current system modeling service, for the Practical Project running provides certain theoretical direction.
For achieving the above object, the present invention adopts following technical scheme:
A kind of correction predicting arc extinguishing angle modeling method, the step that it comprises is as follows:
1) be the main circuit that PSCAD/EMTDC builds direct current system at Simulation Environment Software; Described main circuit comprises inversion side part;
2), for inversion side part in main circuit, build inversion side control circuit, with step 1) form the direct current system circuit together with described main circuit;
3), by inversion side control circuit, revise predicting arc extinguishing angle in circuit, obtain to be used for to control the leading Trigger Angle of the trigger impulse of inversion side valve; Thus, the control by leading Trigger Angle size maintains in normal 15 ° to 20 ° interval nominal angle extinguish angle.
The specific implementation step that described correction predicting arc extinguishing angle comprises is:
A) by the current transformer in the measurement links module I that is provided with in inversion side control circuit, main circuit one pole direct current is measured, will measure the current value of gained and the converter transformer leakage reactance X that definite value 6/ π, inversion side are provided with
T, the converter transformer no-load voltage ratio value T that is provided with of inversion side multiplies each other and obtains numerical value A through multiplication module I;
B), by the voltage transformer in the measurement links module ii that is provided with in inversion side control circuit, one pole direct voltage in main circuit is measured the definite value that provides with the definite value module ii
Multiply each other and obtain numerical value B through multiplication module II;
C) by the current transformer in the measurement links module I that is provided with in inversion side control circuit, main circuit one pole direct current is measured, definite value 1 addition that the current value of measuring gained is provided through adder Module II and definite value module ii I, the COEFFICIENT K that the result of addition and correction factor module provide, multiply each other and obtain numerical value C through multiplication module III; Described k value in different direct current systems is different, and span is between 0.5-2;
D) above-mentioned steps a), b) the numerical value A and the B that obtain be divided by by divider module, the definite value cosY that its result and numerical value C, definite value module VI provide is through adder Module I addition, described Y interval is 15 ° to 20 °; Gained and by limit value link module, after anti-cosine transform link module arccos conversion, the definite value π addition that provides through adder Module III and definite value module V, finally by the leading Trigger Angle output module of inversion side, obtain the leading Trigger Angle of inversion side, this leading Trigger Angle is used for controlling the trigger impulse of inversion side valve; Described limit value link module is carried out maximum, minimum value limits,, interval is cos110 °-cos155 °; Described maximum, minimum value limit the numerical value by this link, if numerical value, lower than limit value link minimum value,, by minimum value output, is exported if numerical value, greater than the limiting element maximum, is pressed maximum, all the other situations are pressed actual numerical value output,
E) utilize and finally obtain the leading Trigger Angle of inversion side, be used for controlling the trigger impulse of inversion side valve; Thereby the required extinguish angle size of indirectly controlled system normal operation, remain in 15 ° to 20 ° zone of reasonableness it.
Revise the predicting arc extinguishing angle system and comprise inversion side control circuit, be provided with a measurement links module I that is used for measuring main circuit one pole direct current in described inversion side control circuit, described measurement links module I is current transformer, the leakage reactance value X that definite value 6/ π that the current value that described measurement links module I will be measured and definite value module I provide, inversion side converter transformer leakage reactance module provide
T, the no-load voltage ratio value T that inversion side converter transformer module provides is input to respectively multiplication module I, and described multiplication module I outputs to divider module with the product numerical value A that multiplying obtains;
Be provided with in inversion side control circuit for the measurement links module ii of measuring main circuit one pole direct voltage, described measurement links module ii is voltage transformer, the definite value that measurement links module ii gained measured value and definite value module ii provide is input to respectively multiplication module II, and the product numerical value B that described multiplication module II computing obtains outputs to divider module;
In the main circuit that described measurement links module I will be measured, the one pole DC current values is by adder Module II and definite value module ii I addition, and the COEFFICIENT K that the result of addition and correction factor module provide, carry out multiplying by multiplication module III and obtain numerical value C;
Be input to adder Module I together with the numerical value C that described divider module and multiplication module III output obtain and definite value module VI and carry out add operation, acquired results is sent into limit value link module, limit value link module is after limit value, the limit value result is transfused to anti-cosine transform link module, described anti-cosine transform link module and definite value module V are input to respectively adder Module III and carry out addition, and the leading Trigger Angle output module of addition result input inversion side obtains the leading Trigger Angle of inversion side.
Described definite value module ii provides definite value to be
It is 1 that described definite value module ii I provides definite value; It is cosY that described definite value module VI provides definite value; Described Y is specified extinguish angle, and span is between 15 ° to 20 °, and it is π that described definite value module V provides definite value.
Utilize measurement links module I, measurement links module ii to measure one pole direct current in main circuit and one pole direct voltage, extinguish angle is predicted, revises, calculated, finally obtain the leading Trigger Angle of inversion side, be used for controlling the trigger impulse of inversion side valve; Thereby in the time of indirectly working, required extinguish angle size, remain in 15 ° to 20 ° zone of reasonableness it.This control mode can prevent the generation of the faults such as commutation failure effectively.
The invention has the beneficial effects as follows: it can be preferably be the dynamic characteristic service of simulation study mixing ac and dc systems, be applicable to survey the direct current system of extinguish angle, after revising, inversion side gamma kick curve is a positive slope curve, can return to the steady operation point after disturbance.It is the indispensable part of the detailed modeling of direct current system.
Description of drawings
Fig. 1 is for revising predicting arc extinguishing angle modeling method flow chart;
Fig. 2 is for revising predicting arc extinguishing angle control circuit model;
Fig. 3 is the static volt ampere of direct current system under this control model;
Fig. 4 is the static volt ampere of the silver-colored east of adopting this control mode ± 660kV direct current system model;
Fig. 5 a is the anodal rectification side direct voltage of the silver-colored eastern direct current system that adopts this control circuit modeling and current waveform;
Fig. 5 b is the anodal inversion side direct voltage of the silver-colored eastern direct current system that adopts this control circuit modeling and current waveform;
Fig. 5 c is for adopting silver-colored eastern direct current system negative pole rectification side direct voltage and the current waveform of this control circuit modeling;
Fig. 5 d is for adopting silver-colored eastern direct current system negative pole inversion side direct voltage and the current waveform of this control circuit modeling;
Fig. 5 e is the silver-colored eastern direct current system inversion side extinguish angle of this control circuit modeling of employing and the active power of transmission;
Fig. 5 f is the silver-colored eastern direct current system rectification side that adopts this control circuit modeling and the reactive power that the inversion top-cross is changed.
wherein, 1. one pole direct current, 2. measurement links module I, 3. multiplication module I, 4. definite value module I, 5. inversion side converter transformer leakage reactance module, 6. divider module, 7. one pole direct voltage, 8 measurement links module iis, 9. multiplication module II, 10. definite value module ii, 11. adder Module I, 12. definite value module VI, 13. inversion side converter transformer module, 14. adder Module II, 15. multiplication module III, 16. definite value module ii I, 17. correction factor module, 18. limit value link module, 19. anti-cosine transform link module, 20. adder Module III, 21. definite value module V, 22. the leading Trigger Angle output module of inversion side.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing and embodiment:
In Fig. 1, Fig. 2, specifically implemented a kind of correction predicting arc extinguishing angle modeling method and system, the concrete steps that it comprises are as follows: at Simulation Environment Software, be 1) main circuit that PSCAD/EMTDC builds direct current system; Described main circuit comprises inversion side part; 2), for inversion side part in main circuit, build inversion side control circuit, with step 1) form the direct current system circuit together with described main circuit; 3) by inversion side control circuit, revise prediction breath arc angle in circuit, obtain to be used for to control the leading Trigger Angle of the trigger impulse of inversion side valve; Thus, by the control to leading Trigger Angle size, extinguish angle is maintained in normal 15 ° to 20 ° interval nominal angle.
Wherein, the correction predicting arc extinguishing angle of proposition specifically comprises following content:
A) by the current transformer in the measurement links module I 2 that is provided with in inversion side control circuit, main circuit one pole direct current 1 is measured, will measure the current value of gained and the converter transformer leakage reactance X that definite value 6/ π, inversion side are provided with
T, the converter transformer no-load voltage ratio value T that is provided with of inversion side multiplies each other and obtains numerical value A through multiplication module I;
B), by the voltage transformer in the measurement links module ii 8 that is provided with in inversion side control circuit, one pole direct voltage 7 in main circuit is measured the definite value that provides with definite value module ii 10
Multiply each other and obtain numerical value B through multiplication module II 9;
C) by the current transformer in the measurement links module I 2 that is provided with in inversion side control circuit, main circuit one pole direct current 1 is measured, definite value 1 addition that the current value of measuring gained is provided through adder Module II 14 and definite value module ii I 16, the COEFFICIENT K that the result of addition and correction factor module 17 provide, multiply each other and obtain numerical value C through multiplication module III 15; Described k value in different direct current systems is different, and span is between 0.5-2;
D) above-mentioned steps a), b) the numerical value A and the B that obtain be divided by by divider module 6, the definite value cosY that its result and numerical value C, definite value module VI 12 provide is through adder Module I 11 additions, described Y interval is 15 ° to 20 °; Gained and by limit value link module 18, after anti-cosine transform link module 19 is the arccos conversion, the definite value π addition that provides through adder Module III20 and definite value module V 21, finally by the leading Trigger Angle output module 22 of inversion side, obtain the leading Trigger Angle of inversion side, this leading Trigger Angle is used for controlling the trigger impulse of inversion side valve; Described limit value link module 18 is carried out maximum, minimum value limits,, interval is cos110 °-cos155 °; Described maximum, minimum value limit the numerical value by this link, if numerical value, lower than limit value link minimum value,, by minimum value output, is exported if numerical value, greater than the limiting element maximum, is pressed maximum, all the other situations are pressed actual numerical value output,
E) utilize and finally obtain the leading Trigger Angle of inversion side, be used for controlling the trigger impulse of inversion side valve; Thereby in the time of indirectly working, required breath arc angle size, remain in 15 ° to 20 ° zone of reasonableness it.
Revise the predicting arc extinguishing angle system and comprise inversion side control circuit, be provided with a measurement links module I 2 that is used for measuring main circuit one pole direct current 1 in inversion side control circuit, described measurement links module I 2 is current transformer, the leakage reactance value X that definite value 6/ π that the current value that described measurement links module I 2 will be measured and definite value module I 4 provide, inversion side converter transformer leakage reactance module 5 provide
T, the no-load voltage ratio value T that inversion side converter transformer module 13 provides is input to respectively multiplication module I 3, and described multiplication module I 3 outputs to divider module 6 with the product numerical value A that multiplying obtains; Be provided with in inversion side control circuit for the measurement links module ii 8 of measuring main circuit one pole direct voltage 7, measurement links module ii 8 is voltage transformer, the definite value that measurement links module ii 8 gained measured values and definite value module ii 10 provide is input to respectively multiplication module II9, and the product numerical value B that described multiplication module II 9 computings obtain outputs to divider module 6; In the main circuit that measurement links module I 2 will be measured, the one pole DC current values is by adder Module II 14 and definite value module ii I 16 additions, the COEFFICIENT K that the result of addition and correction factor module 17 provide, carry out multiplying by multiplication module III 15 and obtain numerical value C; Be input to adder Module I 11 together with the numerical value C that divider module 6 and multiplication module III 15 outputs obtain and definite value module VI 12 and carry out add operation, acquired results is sent into limit value link module 18, limit value link module 18 is after limit value, the limit value result is transfused to anti-cosine transform link module 19, described anti-cosine transform link module 19 is input to respectively adder Module III 20 with definite value module V 21 and carries out addition, and the leading Trigger Angle output module 22 of addition result input inversion side obtains the leading Trigger Angle of inversion side.Definite value module ii 10 provides definite value to be
It is 1 that described definite value module ii I 15 provides definite value; It is cosY that described definite value module VI 12 provides definite value; Described Y is specified extinguish angle, and span is between 15 ° to 20 °, and it is π that described definite value module V 21 provides definite value.
The leading Trigger Angle of inversion side that utilization obtains, this leading Trigger Angle is used for controlling the trigger impulse of inversion side valve, has so just played and has controlled preferably effect.all control modes of direct current system are (such as determining Current Control, determine voltage control etc.) be finally all in order to control the size of Trigger Angle, described Trigger Angle is called again the trigger delay angle, satisfied 180 degree subtract the trigger delay angle and equal the relation of leading Trigger Angle, this control model is based on the prerequisite that can't survey extinguish angle, by other parameter (voltage, electric current etc.) extinguish angle is predicted, revise, calculate, draw Trigger Angle, and by the control of leading Trigger Angle size, make extinguish angle maintain a normal nominal angle, extinguish angle is lower than 8 °, think the generation commutation failure, this control mode can prevent the generation of the faults such as commutation failure effectively.
Adopt this control circuit model, the effect that can reach in theory as shown in Figure 3, Fig. 3 is the static volt ampere of direct current system under this control model, dotted line e-i in Fig. 3 is inversion side control model, positive slope curve gh has embodied correction predicting arc extinguishing angle control model, has guaranteed can return to the steady operation point after disturbance.
Modelling verification: according to the modeling method of above-mentioned mixing ac and dc systems, right ± eastern direct current system of 660kV silver is carried out the modeling checking, this model of operation after modeling, and after the system operation, the gained graphic parameter is as shown in Fig. 4, Fig. 5 (a)-(f):
Can obtain from simulation result, as shown in Figure 4, adopt the silver-colored east of this control mode ± static volt ampere of 660kV direct current system model and the design sketch 3 that reaches in theory substantially to be consistent,
after adopting correction predicting arc extinguishing angle control model method, the eastern direct current system model leakage reactance XT value of silver adopts 9.92, inversion side converter transformer module (13) no-load voltage ratio value T, the eastern direct current of silver is got 515/269.1, adjusted coefficient K, generally get 0.5-2, the eastern direct current of silver is got 1, limit value link module (18) is got-0.91--0.34 concerning the eastern direct current of silver, as can be seen from Figure 4, the eastern direct current system model the two poles of the earth rectification side dc voltage value of silver is all between 650-670kV, its value meets the standard value under the specified operation of direct current system, the two poles of the earth rectification side direct current is 3-3.05kA, its value also meets the standard value under the specified operation of direct current system.The two poles of the earth inversion side direct voltage is 630-650kV, direct current is 3-3.02kA, after inversion side extinguish angle is stable, its value size is 17 degree, the active power that direct current system is carried is about 3850MW, the reactive power that absorbs is about 2200MVAR, consider the scope that error allows, all with Practical Project, coincide.Thereby prove that this correction predicting arc extinguishing angle modeling method is feasible for the emulation of mixed DC system dynamic characteristic research.
Although above-mentionedly by reference to the accompanying drawings the specific embodiment of the present invention is described; but be not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (2)
1. the correction predicting arc extinguishing angle system of a modeling method, it revises predicting arc extinguishing angle modeling method, and the step that comprises is as follows:
1) be the main circuit that PSCAD/EMTDC builds direct current system at Simulation Environment Software; Described main circuit comprises inversion side part;
2), for inversion side part in main circuit, build inversion side control circuit, form the direct current system circuit together with the described main circuit of step 1);
3), by inversion side control circuit, revise predicting arc extinguishing angle in circuit, obtain to be used for to control the leading Trigger Angle of the trigger impulse of inversion side valve; Thus, by the control to leading Trigger Angle size, extinguish angle is maintained in normal 15 ° to 20 ° interval nominal angle;
It is characterized in that, described correction predicting arc extinguishing angle system comprises inversion side control circuit, be provided with a measurement links module I (2) that is used for measuring main circuit one pole direct current (1) in described inversion side control circuit, described measurement links module I (2) is current transformer, the leakage reactance value X that definite value 6/ п that the current value that described measurement links module I (2) will be measured and definite value module I (4) provide, inversion side converter transformer leakage reactance module (5) provide
T, the no-load voltage ratio value T that inversion side converter transformer module (13) provides is input to respectively multiplication module I(3), described multiplication module I(3) product numerical value A that multiplying is obtained outputs to divider module (6);
Be provided with in inversion side control circuit for the measurement links module ii (8) of measuring main circuit one pole direct voltage (7), described measurement links module ii (8) is voltage transformer, the definite value that measurement links module ii (8) gained measured value and definite value module ii (10) provide is input to respectively multiplication module II(9), described multiplication module II(9) the product numerical value B that obtains of computing outputs to divider module (6);
In the main circuit that described measurement links module I (2) will be measured, the one pole DC current values is by adder Module II (14) and definite value module ii I (16) addition, the COEFFICIENT K that the result of addition and correction factor module (17) provide, by multiplication module III(15) carry out multiplying and obtain numerical value C;
described divider module (6) and multiplication module III(15) output the numerical value C and the definite value module VI(12 that obtain) together be input to adder Module I(11) carry out add operation, acquired results is sent into limit value link module (18), limit value link module (18) is after limit value, the limit value result is transfused to anti-cosine transform link module (19), described anti-cosine transform link module (19) and definite value module V(21) be input to respectively adder Module III(20) carry out addition, the addition result input inversion leading Trigger Angle output module of side (22) obtains the leading Trigger Angle of inversion side.
2. revise as claimed in claim 1 the predicting arc extinguishing angle system, it is characterized in that, described definite value module ii (10) provides definite value to be
Described definite value module ii I(16) providing definite value is 1; Described definite value module VI(12) providing definite value is cosY; Described Y is specified extinguish angle, and span is between 15 ° to 20 °, described definite value module V(21) definite value is provided is п.
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| CN104734172A (en) * | 2015-03-02 | 2015-06-24 | 河海大学 | Self-adaption PI control method for improving HVDC system suppressing phase commutation failure capacity |
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| CN103259257B (en) * | 2013-03-21 | 2015-02-04 | 国网智能电网研究院 | Implementation method for direct current transmission system forward direction slope control strategy |
| CN103257576B (en) * | 2013-03-29 | 2015-11-18 | 国家电网公司 | A kind of extinction angle start control simulation device |
| CN110137999B (en) * | 2019-05-28 | 2023-03-28 | 国网江西省电力有限公司电力科学研究院 | Direct-current power coordination control method and system with participation of receiving-end wind power plant |
| CN112701676B (en) * | 2020-12-15 | 2023-07-07 | 深圳供电局有限公司 | Arc extinguishing angle prediction and commutation failure suppression method |
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| CN1881772A (en) * | 2005-06-16 | 2006-12-20 | 许继集团有限公司 | Method for controlling prediction type extinguish angle in DC power transmission system |
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