MATLAB EMBEDDED IDE LINK 4 Podręcznik Użytkownika Strona 1

Industrial Electrical Engineering and Automation CODEN:LUTEDX/(TEIE-5259)/1-57/(2008)Evaluation of a DSP for power electronic applications Per Moli

8Each event manager is equipped with two independent timers – making it a total of four. Timers are useful when handling time critical algorithms or

94 - Software A number of software tools has been used and evaluated for this report, giving the user two main alternatives when programming – eith

10 Screenshot of CCS 3.1 CCS v3.1 comes with a selection of emulators, including a F2812 specific. This is a great feature considering that the hard

115 - Implementation of a digital relaying algorithm 5.1 – Relays of the past and present Since the beginning of the 20th century, relays built wi

125.2 – The model To check the suitability of the DSP regarding power electronic applications, a simplified relay model is constructed. The model co

136 - Benchmark Considering that relays and circuit breakers demand short response times between the actual error and the moment when the signal ha

14The system clock frequency of 150MHz is divided by the high speed clock prescaler of 2, and then divided by the timer control input clock prescaler

157 - Conclusion As shown in previous chapters the F2812 performs really well in this type of applications, and the Link- and Target- package for S

168 - References 8.1 – Books [8.1.1] Computer Relaying for Power Systems, Arun G. Phadke, James S. Thorp, SRP Ltd., 2000 [8.1.2] Power System A

17Appendix A – A Quick guide to CCS and the hardware A.1 – Before you start Basic experience of c/c+ is highly recommended. Download the example

Evaluation of a DSP for power electronic applications Master Thesis work, 2008 at The Department of Industrial Electrical Engineering and Aut

18A.2 - Code Composer Studio A.2.1 – The User Interface Directly after opening CCS, your screen should look something like this: Let’s start by

19In this case, we open up the project Example_281xEvPwm.pjt. Note that we have a beautifully arranged directory-style file structure with the main

20enabled. (this procedure can also be used for the removal of breakpoints) To review the deployed breakpoints a command called simply “Breakpoints”

21A.3 - Hardware Note that a lot of the information found in this section only applies for the modified F2812 with interface card. On the front pla

22 The DSP-board A.3.1 – The LEDs The LEDs are connected to the P7-connection on the DSP-board. Here’s a code segment displaying how to use them:

23A.3.2 – The buttons The buttons are also connected to the P7-connection and can be used in the following manner: void Init_Buttons(void){ EALLOW;

24 A.3.4 – Rear connections The DSP can generate a pulse train with variable period (actually, its duty cycle) - this method, PWM (Pulse-Width Modula

25 // Initalize EVA Timer2 EvaRegs.T2PR = 0x03FF; // Timer2 period EvaRegs.T2CMPR = 0x03C0; // Timer2 compare EvaRegs.T2CNT = 0x0000;

26This concludes the CCS part of the guide, please refer to the literature used in this report for further information.

27Appendix B – Simulink blocks This part of the guide covers some of the new Simulink blocks and how to use them. Basic knowledge of Simulink and M

1Acknowledgements The author would like to thank Magnus Akke and Gunnar Lindstedt for their invaluable support and expertise during this project.

28 A lot of options regarding the control logic and deadband are also available – giving the user full control over how the resulting signal shoul

29 Nonetheless, it has great potential and a closer look at the example programs provided by Mathworks is highly recommended. Finally, some old a

30Appendix C – Useful registers The contents of this chapter should be of little interest when using Simulink to generate the code. Should one ever

31Another useful register is GPTCONA (Address 7400h) GPTCONA as seen in the Event Manager Reference Guide Bit(s) Name Description 15 Rese

32Bit(s) Name Description 4−3 Reserved 2 C3TRIPE C3TRIP Enable: 1 C2TRIPE C2TRIP Enable: COMCONA contains settings for the PWM

33 ADCTRL1 as seen in the Analog-to-Digital Converter Reference Guide Bit(s) Name Description 15 Reserved Reads return a zero. Writes h

34Appendix D – Simulink Models D.1 – The relay algorithm This is the main model, notice the ADC block in red, the green Digital Output block con

35 The contents of the oscillator subsystem. A 50 Hz reference signal is on the input side – sine- and cosine-waves are outputted. D.2 – The benchm

36 The first triggered subsystem, triggered by the push of a button – the current timer position is read and saved – the filter calculation is starte

37Appendix E – C-code E.1 – The relay algorithm Code Composer Studio generates all necessary files and directories, I’ve chosen to only include th

2Table of contents TABLE OF CONTENTS...

38 /* S-Function Block: <Root>/ADC (c28xadc) */ { AdcRegs.ADCTRL2.bit.RST_SEQ1 = 0x1;// Sequencer reset AdcRegs.ADCTRL2.bit.SOC_SEQ

39 */ rtb_Gain.re = TwinDFTs_CCS_P.Gain_Gain_n * rtb_ComplextoMagnitudeAngle1_o2; rtb_Gain.im = TwinDFTs_CCS_P.Gain_Gain_n * rtb_PhaseRelay;

40 */ rtb_Product.re = TwinDFTs_CCS_P.Gain_Gain_m * rtb_Angle; rtb_Product.im = TwinDFTs_CCS_P.Gain_Gain_m * rtb_PhaseRelay; /* ComplexToMag

41 TwinDFTs_CCS_B.TmpHiddenBufferAtDigitalOutputI[0] = rtb_RelayDFT1; TwinDFTs_CCS_B.TmpHiddenBufferAtDigitalOutputI[1] = rtb_RelayDFT2; TwinDFT

42static void TwinDFTs_CCS_update(int_T tid) { /* Update for UnitDelay: '<S7>/Unit Delay' */ TwinDFTs_CCS_DWork.UnitDelay_DSTATE

43 /* Update absolute time for base rate */ if (!(++TwinDFTs_CCS_M->Timing.clockTick0)) ++TwinDFTs_CCS_M->Timing.clockTickH0; TwinDFT

44 pVoidBlockIORegion = (void *)(&TwinDFTs_CCS_B.ADC[0]); for (i = 0; i < 13; i++) { ((real_T*)pVoidBlockIORegion)[i] = 0.0;

45 void MdlInitialize(void) { /* InitializeConditions for UnitDelay: '<S7>/Unit Delay' */ TwinDFTs_CCS_DWork.UnitDelay_DSTATE = T

46 * o Embedded Target for TI C6000 DSP User's Guide */ #include "TwinDFTs_CCS.h" #include "TwinDFTs_CCS_private.h" #inc

47// Entry point into the code // void main(void) { volatile boolean_T noErr; const char_T *status; init_board(); /************************

3A.3 - HARDWARE... 21

48 */ #include "TwinDFTs_CCS.h" #include "TwinDFTs_CCS_private.h" /* Block parameters (auto storage) */ Parameters_TwinDFTs_CCS

49 { -0.0, -0.0, -0.0, -0.0, -0.0, -0.0, -0.0, -0.0, -0.0, -0.0, -0.0, -0.0, -0.0, -0.0, -0.0, -0.0, -0.0, -0.0, -0.0 }, /* Meanof20samples1

50 #include "benchmark.h" #include "benchmark_private.h" /* Block signals (auto storage) */ BlockIO_benchmark benchmark_B; /* B

51 { int_T i; const real_T *Amtx = &benchmark_P.DiscreteFilter_A[0]; real_T *x = &benchmark_DWork.DiscreteFilter_DSTATE[

52 /* Initialize timing info */ { int_T *mdlTsMap = benchmark_M->Timing.sampleTimeTaskIDArray; mdlTsMap[0] = 0; benchmark_M->Ti

53/* Model terminate function */ void benchmark_terminate(void) { /* (no terminate code required) */ } /*=========================================

54void MdlTerminate(void) { benchmark_terminate(); } /*========================================================================* * End of GRT com

55 * is what makes the generated code "real-time". The function rt_OneStep is * always associated with the base rate of the model. Subra

56 rtmGetOffsetTimePtr(S), rtmGetSampleHitPtr(S), rtmGetSampleTimeTaskIDPtr(S), rtmGetTStart(S), &rtmGetSimTimeStep(S), &a

41 - Introduction and project outline The complexity of the power grid increases with its continuous expansion and the addition of software control

52 - Alternatives and their properties Before choosing the system to be evaluated, four main DSP-alternatives have been scrutinized in order to fin

62.1.3 - Signal levels Regarding signal levels, the eZdsp is the only alternative that doesn’t support the standardized [-10, 10] V by default – howe

73 - Hardware In the previous chapter the decision to evaluate the Spectrum Digital eZdsp F2812 was made. The obvious reasons for choosing the eZ