Implementation of new features in ATPDraw version 3
Contents
1. Fig 4 Specification of Cable data under Cable Parameters grounding is fixed and View of the cross section Grounded conductors appear in the background color Fig 3 Cross section of 750 kV overhead line An important part is the Verify module that supports two method of model verification The first one is called LINE MODEL FREQUENCY SCAN 1 This method compares the model with the exact PlI equivalent in the frequency domain Calculation of impedances in the zero and positive sequence and the mutual sequence impedance between two circuits of 6 phase systems is supported The user can specify which circuit the conductors belong to and optionally ground conductors Fig 5 shows the verification of the model in fig 2 3 The method can be used to verify if the model is suitable for the typical transients occurring in the study For the JMarti line verified in fig 5 0 55 1 55 0 0585 17 5 27 9 13 4 2 2 0 55 1 55 0 0585 0 27 9 13 60 45 4 3 j3 0 55 1 55 0 0585 17 5 27 9 13 60 45 4 PEF e 0 03 08 0304 132 41 05 2615 0 0 0 4 0 too Line model 5 jo o3 os 0 304 132 41 05 2615 0 0 a es O a E cal Mode Zero seq Fig 2 Line Cable dialog box Upper Selection of system type line or cable standard data grounding and frequency and Model data type of model and frequency Lower Specification es of conductor data O2 1 3 13 2 m i 01 loglfreq Copy wmf At tower 0 02. 2 0 4 0 6 0 T 41 05 m Midspan Fig 5 Verification of the JMarti line in fig 2 positive sequence 26 15 m The accuracy is highest around the transformation matrix _ 00 ee ee frequency Freq matrix 1000 Hz j gt 4 Separ 60 cm 17 5 m par 60 c At tower Alpha 45 i Short circuit impedances and open circuit line chargin Na ABE Circuit RO ohm X0 ohm AR ohm 5 ohm G vA G MA INCU onm onm anm jonm Midspan ee 20a ee ee eee sil Um 1 1225 51 12 09529 23 66 146 2 200 7 ELE EEE EE EOE EE EEE EEE ENTE EEE ENED Calculated at frequency Hz 50 Reference line voltage kY 750 Report Help OF Fig 6 Verification of the 750 kV power line in fig 2 3 The second method is called POWER FREQUENCY CALCULATION This method calculates the short circuit impedances and the open circuit reactive power charging in the zero and positive sequence as well as mutual transfer impedance for multi circuit systems at power frequency Such values are typically available benchmark data for systems in operation Fig 6 shows the verification of the model in fig 2 3 The method can be used to verify if the International Conference on Power Systems Transients IPST 2003 in New Orleans USA parameters used for the system is correct Typical problems could be overhead line heights and ground resistivity etc When the user clicks on the Run ATP or the OK button of the Line Cable dialog
3. Fig 9 Viewing the magnetization characteristic A similar characteristic can also be calculated for the resistive part If zero sequence data are available they can be specified in fig 7 as well The calculated J U characteristic can be automatically transformed to an i A current fluxlinked characteristic by an internal SATURA like routine 1 2 Selecting the Lm flux will allow to display the i A characteristic similar to fig 9 and to copy it directly to nonlinear inductances of type 93 and 98 The user can choose to Auto add nonlinearities under Structure and in this case the magnetizing inductance is automatically added to the final ATP file as a type 98 inductance ATPDraw connects the inductances in Y or A dependent on the selected connection for actual winding for a 3 phase transformer In this case the user has no control of the initial state of the inductor s If more control is needed Auto add nonlinearities should not be checked The user must then create separate nonlinear inductances and copy the 1 4 characteristic Fig 10 shows a simulation of the open circuit excitation current into the low voltage side applying 16 kV line voltage Fig 10 Open circuit currents at nominal voltage Fig 11 shows the measured no load current of the at the same transformer The line current in phase A is shown together with the phase current A to C This figure fits qualitively well with fig 10 The peaks of the line c
4. International Conference on Power Systems Transients IPST 2003 in New Orleans USA Implementation of new features in ATPDraw version 3 Hans K Hgidalen Bruce A Mork Laszlo Prikler and James L Hall 1 Dept of Electrical Engineering the Norwegian University of Science and Technology N 7491 Trondheim Norway e mail hans hoidalen elkraft ntnu no 2 Dept of Electrical Engineering Michigan Technological University Houghton MI49931 1295 USA 3 SYSTRAN Engineering Services Viola u 7 H 2013 Pomaz HUNGARY 4 Bonneville Power Administration Portland OR 97208 3621 USA Abstract The paper addresses the new features in the ATPDraw program with focus on the technical aspects of line cable and transformer modeling Version 3 of the program supports directly the supporting routines LINE and CABLE CONSTANTS CABLE PARAMETERS and BCTRAN of ATP EMTP The paper finally outlines the advanced multilevel grouping facility and the new support of Parameter and Pocket Calculator Keywords Graphical preprocessor line cable and transformer modeling CAD ATP EMTP I INTRODUCTION ATPDraw is a graphical preprocessor to the ATP EMTP 1 2 on the MS Windows platform In the program the user can build up an electric circuit using the mouse by selecting predefined components from an extensive palette 3 4 Both single phase and 3 phase components are supported ATPDraw generates the ATP file in the proper f
5. N still needs improvements and increased knowledge about how to handle 3 legged cores and A connected magnetizing branches including the nonlinearity in the magnetization losses Saturation can be automatically added externally to the BCTRAN linear matrix model connected and in A or Y couplings A coupled nonlinear inductances can some times cause numerical problems so connecting the magnetization branch at the Y coupled winding closest to the core is recommended The new edit features Grouping and Parameters simplify and open up new possibilities in modular circuit construction ACKNOWLEDGEMENT The work on ATPDraw is possible due to financing from U S Dept of Energy Bonneville Power Administration and Pacific Engineering Corporation Francisco Gonzalez Molina and Sung Don Cho advised the development of the BCTRAN support REFERENCES 1 Alternative Transients Program ATP Rule Canadian American EMTP User Group 1987 1998 2 H W Dommel et al Electromagnetic Transients Program Reference Manual EMTP Theory Book Prepared for BPA Aug 1986 3 L Prikler H K H idalen ATPDraw version 3 5 for Windows 9x NT 2000 XP User s Manual SEfAS TR F5680 ISBN 82 594 2344 8 Aug 2002 4 H K H idalen L Prikler J Hall ATPDraw Graphical Preprocessor to ATP Windows version Proc IPST pp 7 12 June 20 24 1999 Budapest Hungary 5 L Dub Models in ATP Language manual Feb 1996 6 N Mohan Computer Ex
6. apts the number of windings and phases The user can also request the inverse L matrix as output by checking AR Output An Auto add nonlinearities button appears when an external magnetizing branch is requested as explained below Under Ratings the nominal line voltage rated power and type of coupling is specified Connections A auto transformer Y and D are available and all possible phase shifts are supported The specified line voltage is automatically scaled to get the winding voltage VRAT If an Auto transformer is selected for the primary and secondary winding HV LV the impedances are recalculated as shown in section 6 7 in 2 Z ir i 1 a Zy Va Vi Znaor Vn Zir V Vy V y Va VL Vi Vi where Zzp Zz 7 and Zy 7 are the Imp values from fig 7 lower and Zs oe Zoa and AR are the values written to the BCTRAN file BCTRAN C ATPDRAW versjon3 5 Bct BCTRAN_ipst bct mStructure Ratings Number of phases 3 Number of windings 2 cael m fie Type of core 5 leaged stacked core v Power MVA 2 my 230 Test frequency Hz 0 Connections Y z D z M AR Output Phase shift deg 150 v rFactory tests Open circuit Short circuit Performed at Lv Connect at Lv positive sequence Zero sequence data available 178 562 226 485 106 25 0 67 LILI View Copy Am Lm ms Lm flux rPositive core magnetization External Lm Exte
7. ard support of the graphics This feature is particularly useful for cable systems as it also shows which conductor is grounded as illustrated in fig 4 International Conference on Power Systems Transients IPST 2003 in New Orleans USA Line Cable Data C ATPDRAW versjon3 5 LCC LIN 750_1_alc Model Data m System type Overhead Line Phases 3 I Transposed Unit Metric English MV Auto bundling m Model fitting data Bergeron Decades Points Dec a MV Skin effect NAME DEFAULT VALUE OP ro ce SO Freq matrix Hz Freg SS Hz Standard data Rho ohm m 20 Freg init Hz 0 005 Lenath km 24 6 L Segmented ground MV Real transf matrix Model Type Data JMatti Noda i000 po JEPsTolAt os fos Sem E NorMax A1 30 emyen Use default fitting ee ee ee Comment OK Cancel Import SaveAs Run ATP View Verify Edit icon Help Data Fp ep epep eee CS G C a S S G C 60 45 corrections could be to change the frequency for which the transformation matrix is calculated at Model Data Cable number 2 3 Paste Copy m Total radius R7 m 0 075 0 055 Core 0 03 0 06 0 07 M On O Ground BS View Model Of x 2 5E 8 Edit View Sheath M On V Ground M On V Ground a m Position Vertical m i Horizontal m el
8. box fig 2 ATPDraw executes ATP and automatically transforms the punched file into a library file on data base module format ready to be used in the electrical circuit B Transformer modeling In version 3 5 of ATPDraw BCTRAN is supported directly in the same way as lines cables ATPDraw supports single and 3 phase transformers with up to 3 windings All types of phase shifts for A and Y connected windings are supported and a special handling of auto transformers is included Handling of the nonlinear magnetization branch is also incorporated both manually and automatic In a new View module the user can get a picture of the nonlinear characteristic and easily transforms the voltage current rms value characteristic into a fluxlinked peak current characteristic Fig 7 shows the BCTRAN dialog box with data based on the test report of a 290 MVA transformer shown in table I Table I Transformer test report 290 MVA 50 Hz MVA Coupling 290 YNJ 290 d5 Open EO kV circuit test LS 12 75 14 87 5 15 93 75 16 100 17 106 25 Short kV MVA ek er circuit test HS LS 432 16 14 6 0 24 The reference current in the open circuit case is Ief 290 MVAI 3 16 kV 10 5 kA Pk kW 704 4 Under Structure in fig 7 the user specifies the number of phases the number of windings the type of core not supported yet except for single phase cores triplex and the test frequency The dialog box format ad
9. e can be automatically examined for error warning messages The user can select 5 different and typical flags e Free format ATP file input The user now has the option to insert text strings directly into the ATP file at predefined positions These text strings follow the project file This will enable an indirect support of special miscellaneous ATP options like ABSOLUTE U M DIMENSIONS etc e The file system is substantially changed The ATPDraw distribution consists of 4 files along with the examples The executable program two help files and the standard component library ATPDraw scl which contains the format of about 200 standard components The user save his work in a project file which contains all the files required to edit run and distribute the data case e A User s Manual 3 that documents ATPDraw version is divided in six parts Parts 1 3 introduce ATPDraw and explain how to get started with the program Part 4 is a Reference manual for all menus and components Part 5 is the Advanced manual that covers the new features presented in this paper along with how to create new components Modules or MODELS Part 6 is an Application manual with several practical examples IV DISCUSSION CONCLUSION ATPDraw version 3 covers line cable and transformer modeling The Verify part of overhead lines functions well while problems still exist for cable systems Verification of Noda models is not supported The support of BCTRA
10. ence on Power Systems Transients IPST 2003 in New Orleans USA possible to handle the saturation Typically the magnetization inductance can be added externally To accomplish this the user has to select External Lm The inductive part of the magnetization current at 100 voltage is then subtracted and the remaining open circuit current becomes equal to the resistive part IEXPOS 100 P 10 MV4 SPOSLMV4 2 178 6 10 290 0 0616 where SPOS is equal to the Power MVA specified under Ratings for the winding where the test is performed and P is equal to the open circuit Loss kW at 100 voltage The current in the magnetizing inductance ref fig 8 is then calculated as Loss kW 10 SPOS MVA _ 10 SPOS MVA afi Im 3 on 3 where V is actual rated voltage specified under Ratings divided by J3 for 3 phase Y and Auto connected transformers Curr Loss and Volt are taken directly from the open circuit data The factor 3 in 3 is used only for the 3 phase case The U ms values are then _ Volt calculated as U E a Veg KV 4 h Uim Fig 8 Definition of the Zms U ms quantities Selecting Lm rms under the View Copy group and then the button View will display the nonlinear characteristic for the positive sequence system as shown in fig 9 a View Nonlinearity MELE mir 2 47560906 mar ja AIREA T T log scale C Add 0 0 Copy wmf
11. ercises for Power Electronics Education Dept Electrical Engineering University of Minnesota 1990 Book
12. ies a 1 9 phase line cable model The input dialog box of this circuit element is shown in fig 2 In this dynamic dialog box the user specifies if the component is a cable with or without enclosing pipe or an overhead line Then the geometrical and material parameters can be entered under Data Under Standard data the ground resistivity only homogenous ground supported the initial frequency and the line cable length are specified Finally the user selects the suitable electrical model under Model along with special frequency and fitting data required in each case It is straightforward to switch between the various electrical models Pi Bergeron JMarti Semlyen and Noda and ATPDraw handles all the formats apart from special multiple pi sections Only those cases that really produce an electrical model are supported Fig 2 illustrates a JMarti specification of a 750 kV overhead line given in fig 3 In a cable data case the user can easily switch between CABLE CONSTANTS and CABLE PARAMETERS The first supports a flexible grounding scheme and the Semlyen model while the second supports additional shunt capacitance conductance and the Noda model For each cable in the system the user can specify data for the core sheath and armor and copy data between cables Selecting View will display the cross section This gives a quick overview of the system so obvious errors can be avoided In the View module zooming is supported as well as clipbo
13. nch voltage integrator automatically Also an extra node will appear where the user can specify the fluxlinked name II NEW EDIT OPTIONS Two new mayor edit options were added to ATPDraw version 3 These are multilevel grouping and support of text string parameters A Grouping This option is a powerful tool to increase the readability of the circuit drawings and for reuse of frequent sub circuits Typical examples are grouping of TACS blocks into control system units and creation of 3 phase components A group can be exported and imported making it possible to build up a library of frequent used sub circuits ATPDraw supports multilevel grouping The grouping process is called Compress and the user 1s free to select which of the data and nodes to be external and accessible from the outside If two data parameters are given the same name they seen as one from the outside It is also possible to let a nonlinear characteristic become external A simple example is shown in fig 12 where a 3 phase rms meter is constructed The user first selects a group then Edit Compress In this dialog box the external data nodes are specified Finally a single default icon that can be modified replaces the sub circuit The data parameters are the frequency used in the TACS device 66 and the type of input voltage 90 current 91 to TACS for the three phases These show up as only two parameters in the final rms meter object Fig 12 Compressi
14. ng a 3 phase rms meter in TACS Fig 13 shows a more advanced case where a 6 pulse thyristor bridge with TACS control 6 is grouped into a single object with the AC frequency the firing delay angle and the RC values of the snubber circuits as data parameters This is equal to example Exe 6g adp in the ATPDraw distribution Fig 13 6 pulse Thyristor Bridge grouped into a single object B Parameters ATPDraw version 3 supports ATP s Parameters and Pocket Calculator This implies that the user can specify a 6 character text string for most data parameters and later assign a value to this variable globally This is particularly useful when a data value is used several times in a circuit In such a case all equal data parameters could be given the same text string name The time consuming and risky procedure of clicking up a lot of windows to change the common value can thus be avoided ATPDraw takes care optimal resolution by adding characters to the text string The Pocket Calculator feature allows a data value to be a function of the simulation number in a multiple run Fig 14 shows an example where the rms value of the open circuit current for the transformer model in fig 7 is calculated as a function of the excitation voltage from 12 17 kV The External Lm and the Auto add nonlinearities options are selected The amplitude of the voltage
15. ormat based on what you see is what you get ATPDraw takes care of the node naming process All kinds of circuit editing facilities copy paste grouping rotate export import undo redo are available Most of ATP s standard components as well as TACS are supported and in addition the user can create new objects based on MODELS 5 or Data Base Modularization 1 ATPDraw has a standard Windows layout supports multiple documents and offers a large Windows help file system A ATPDraw File Edit View ATP Objects Tools Window Help Cleef ejaj BX ezl olaf aa al salva TE 2 Exa_11g adp U LEC y an m fa On 0Ff 0n RLC a Exa_6g adp Switches Mi Es Probes amp 3 phase Branch Linear Branch Nonlinear Lines Cables f ES Sources Machines Transformers MODELS TACS a ae v vy h e vr a v User Specified Frequency comp Standard Component MODE EDIT Fig 1 Layout of ATPDraw s main screen including the component selection menu II NEW COMPONENTS ATPDraw now directly supports line cable and transformer modeling via LINE CABLE CONSTANTS CABLE PARAMETERS and BCTRAN supporting routines of ATP The user operates directly with technical data in the circuit ATP EMTP is automatically executed to produce the electrical models included in the final data case A Line cable modeling To add a line or cable to the circuit the user first specif
16. rnal Lm Aim Group No jo Label Comment OK Cancel Import Save As Run ATP View Copy Help Linear internat Factory test data x I Hide Short circuit Zero sequence data available a sequence Pon af HV L 114 6 290 704 4 Fig 7 BCTRAN dialog box Specification of data according to tab I Upper Open circuit data Lower Short circuit data Under Factory test the user can choose either the open circuit test or the short circuit test as shown in fig 7 Under the open circuit test the user can specify where the test was performed and where to connect the excitation branch Normally the lowest voltage is preferred but stability problems for delta connected nonlinear inductances could require the lowest Y connected winding to be used The user can choose between the HV and LV and TV winding for a three winding transformer The excitation voltage and current is specified in and the losses in kW With reference to the ATP RuleBook 1 the values at 100 voltage is used directly as IEXPOS Curr and LEXPOS Loss kW The user can specify up to 6 point on the magnetizing curve C Nonlinearities How to handle the nonlinear open circuit characteristic is specified under the Positive core magnetization group in fig 7 Specifying Linear internal will result in a linear core representation based on the 100 voltage values It is also International Confer
17. source is given the text string variable AMP This variable is then later assign a value under ATP Settings as shown in fig 15 The Number of simulations is set to 6 and this will enable the Pocket Calculator feature The amplitude is defined as a function of the simulation number KNT The constant value 816 5 is equal to 1000 2 3 International Conference on Power Systems Transients IPST 2003 in New Orleans USA Fig 14 ATPDraw circuit for calculation of rms values ATP Settings Simulation Output Switch UM Format Record Yariables PARAMETER settings NAME VALUE AMF 11 KNT 516 5 F x Delete Number of sirnulations E Fig 15 Assigning a value to the text string AMP Fig 16 compares the measured rms values of the open circuit currents from tab I with the calculated from fig 14 The resistive part of the magnetizing branch is fixed at the 100 voltage value 80 Meas Calc 12 13 14 15 16 17 Fig 16 Comparison of measured and calculated rms values of open circuit currents C Other options ATPDraw version 3 also supports some other new features Among these are e Rubber band connections When this option is selected connections behave like rubber bands and follows a moving component group This is useful when larger parts of a circuit are moved e Automatic lis file error detection After the ATP execution the lis fil
18. urrent are a bit higher particularly the second peak on the positive part that is produced by the phase current J 4 c The current in phase A into the A coupled inductors J 4 shown in fig 10 consists of two peaks each half period The first one comes from the current in the inductance in branch A B 4 and the second one comes from branch A C In 3 it is assumed that the current in each saturation inductor for a A connected winding is equal to the phase current divided by aS This is a doubtful assumption however since the three involved inductances will go into saturation at different times Nonlinear inductances with initial fluxlinked condition are added to ATPDraw This is straightforward for type 93 inductances while type 96 and 98 require special treatment A hidden DC voltage source is connected in series with the inductor lasting for one time step and with amplitude of 0 dt where X 0 is the user specified initial fluxlinked International Conference on Power Systems Transients IPST 2003 in New Orleans USA condition The voltage source and the required ideal transformer for non grounded inductances is hidden in the graphical drawing 60 A 40 20 0 5 10 15 20 ms Fig 11 Measurement of excitation currents at nominal voltage In addition these components offer the user to select the fluxlinked output just like any other branch output To support this ATPDraw adds a TACS bra
Download Pdf Manuals
Related Search