Application of Random Space Vector Pulse Width Modulation in Electric Vehicle

Transcription

1 dvanced Science Technology Letters Vol143 (ST 017), pp pplication of Rom Space Vector Plse Width Modlation in Electric Vehicle Goqiang hen School of Mechanical Power Engineering, Henan Polytechnic niversity, Jiaozo, , hina bstract iming at the electromagnetic radiation noise problem reslting from the electric drive system, the application of the rom space vector PWM (SVPWM) strategy is proposed to be sed in the electric vehicle (EV) The rom SVPWM strategy is introdced firstly Frthermore, the closed-loop control system is analyzed based on the vector control method sing the rom SVPWM technology Finally, the proposed application is verified throgh an example The paper provides a new method idea in weakening redcing the electromagnetic radiation in the EV Keywords: Electric vehicle, rom space vector PWM, electromagnetic radiation, harmonic redction 1 Introdction The air polltion, PM5 for example, is a serios problem in the world, which does harm to hman health [1, ] The internal combstion engine vehicle is one main sorce The electric vehicle (EV) has been regarded as one efficient measre to solve the problem The motor the inverter are the key components of the EV The permanent magnet synchronos motor (PMSM) has been widely tilized in the EV The inverter converts the direct crrent (D) electric energy from the battery to the alternative crrent () electric energy, the two-level three-phase inverter has been widely sed becase of its simple strctre [3] The electromagnetic radiation noise in the EV reslting from the high voltage sbsystems is more serios than the traditional vehicle [4-6] Therefore to sppress the electromagnetic radiation noise is most important The inevitable ndesirable harmonic of the space vector plse width modlation (SVPWM) strategy cases the problems of electromagnetic radiation noise The large amplitdes of the clster harmonics (that makes the case more serios) can be evidently sppressed sing the rom SVPWM strategy Therefore, the rom SVPWM strategy has attracted plenty of stdy [7-9] Therefore, the application of the rom SVPWM strategy is proposed to be sed in the EV The rom strategy is introdced firstly Frthermore, the closed-loop control system is analyzed based on the PMSM vector control method sing the rom SVPWM technology Finally, the proposed application is verified throgh an example ISSN: STL opyright 017 SERS

2 dvanced Science Technology Letters Vol143 (ST 017) Rom SVPWM Strategy The topology of the inverter the voltage vector are shown in Fig 1a) 1b), respectively [9, 10] n arbitrary comm voltage vector can be generated by two adjacent active vectors, the corresponding control signal waveforms for the pper arms in the six sextants are shown in Fig 1b) marked with the notations, for the commonly sed 7-segment SVPWM pattern D - P O T 1 D 1 T 3 D 3 T 5 D 5 4 (011) 3 (010) 3 0 (000) β (111) 7 T 1 1 T s s T (110) 1 1 (100) D - T D T 4 D 4 T 6 D N (001) 5 (101) 6 a) The topology of the inverter b) asic space vectors the 7- segment SVPWM pattern Fig 1 The inverter topology the voltage vector The three rom SVPWM schemes incldes (1) the rom switching freqency SVPWM (RSFSVPWM) with that the switching freqency or the switching period is romized in an interval, () the rom zero-vector distribtion SVPWM (RZDSVPWM) with that the zero vector dration time distribtion ratio between the two zero vectors is controlled by a rom variable, (3) the rom plse position SVPWM (RPPSVPWM) with that the plse positions of the three phases are controlled by three independent variables 3 pplication of Rom SVPWM in EV The Vector ontrol (V, also called field-oriented control (FO)) Direct torqe control (DT) are two main methods sed in variable freqency drives to control the three-phase electric motors The V DT have their advantages disadvantages have been sed in all kinds of fields The significant advantages of the V well satisfies the EV application that is reqired to generate fll torqe at zero speed, fast acceleration deceleration performance, so on The closed-loop control system sing the rom SVPWM in the EV is shown in Fig The control system incldes the following modles (1) The phase crrents i are measred sing two crrent sensors, the phase crrent i i is i i ( ) 90 opyright 017 SERS

3 dvanced Science Technology Letters Vol143 (ST 017) ()The crrents i are gotten from the three phase crrents, throgh larke transformation (3) The rotator position angle of the motor is measred sing an encoder or a rotary transformer (4) The crrents are i β gotten from the crrents i β throgh Park transformation (5) The actal speed of the motor is measred sing the rotary transformer or compted sing the differential method from the rotator position angle (6) The control strategy is selected based on the D link voltage, comm voltage, so on (7)The comm i d voltage i q d i are compted based on the selected control strategy (8)The comm q controllers (9) The crrents q are compted sing the crrent controllers, for example PI β are gotten from the comm voltages throgh inverse Park transformation (10) The 6 control plse signals are generated sing the rom SVPWM strategy i i d i i q i d Intention interpretation of the Driver attery ontrol strategy n i d i d i q i q PI PI q d dq dq β i i β Rom SVPWM abc D i Α i Inverter Speed comptation Encoder/rotary transformer PMSM Fig The closed-loop control system sing the rom SVPWM in the EV 4 Example Performance nalysis rom SVPWM strategy simlation model is bilt based on the control system described in Fig The D link voltage is 100V The fndamental freqency of the implicit modlation waveform is 30Hz The switching freqency is 5000Hz The rom zero-vector distribtion factor obeys the niform distribtion on the interval [0,1] for the RZDSVPWM scheme The three independent variables obey the niform distribtion on the interval [0,1] for the RPPSVPWM scheme The simlation reslts of the amplitde peak vales of the clster harmonics arond the switching freqency the doble freqency are shown in Fig 3 for the traditional deterministic 7- opyright 017 SERS 91

4 dvanced Science Technology Letters Vol143 (ST 017) segment SVPWM strategy, RZDSVPWM RPPSVPWM schemes The reslts are gotten based on the FFT (Fast Forier Transformation) of the sampled line-line voltage data From the figre, it can be fond that the rom strategy can significantly sppress the clster harmonic amplitde The following conclsion can be drawn Firstly, the deterministic SVPWM strategy RZDSVPWM strategy present the maximm amplitde peak vales arond the doble freqency while the smaller vales arond the switching freqency if the modlation index is less than 1 The symmetry of the three-phase switching signals shown in Fig1b) contribtes to the above phenomenon Secondly, the RZDSVPWM scheme presents excellent performance on sppressing the harmonic amplitde peak vales arond the doble freqency while does little arond the switching freqency The line-line voltage is symmetrical in the half switching period to some extent, while the rom zero-vector distribtion ratio weakens the symmetry Finally, the RPPSVPWM scheme has more excellent performance than the RZDSVPWM scheme on sppressing the amplitde peak vales arond the doble freqency, which reslts from that the rom plse position in the RPPSVPWM scheme destroys the symmetry of the plse voltage waveforms Harmonic amplitde(%, of fndamental) Modlation index Harmonic amplitde(%, of fndamental) Modlation index a) rond the switching freqency b) rond the doble freqency Fig 3 mplitde peak vales of the clster harmonic 5 onclsion The rom SVPWM strategy is proposed to be sed in the electric drive system of the EV The application has several advantages Firstly, the proposed method has significant performance on sppressing the harmonic amplitde peak vales In addition, the rom variable can be realized throgh the psedo-rom nmber generated sing the comptation formlas The psedo-rom nmber array can also be generated in advance stored in the read-only memory of the microcontroller nit Finally, only the control program shold be pdated while no change in the control hardware of the EV is reqired for some rom SVPWM schemes, so the 9 opyright 017 SERS

5 dvanced Science Technology Letters Vol143 (ST 017) algorithm is highly convenient feasible However, the niversal theoretical expression for the performance is extremely complicated This task is or ftre stdy cknowledgments This work is spported by National Science Fondation of hina (No ) The athor wold like to thank the anonymos reviewers for their valable work References 1 M Manosakas, H Papaefthymio, E Diapoli, Migliori, G Karydas,I ogdanovic- Radovic, K Eleftheriadis: ssessment of PM5 sorces their corresponding level of ncertainty in a coastal rban area sing EP PMF 50 enhanced diagnosticsscience of the Total Environment574, (017) Imran Shahid,Magdalena Kistler, zam Mkhtar, adar M Ghari,arlos Ramirez-Santa rz, Heidi aer, Hans Pxbam: hemical characterization mass closre of PM10 PM5 at an rban site in Karachi-Pakistan tmospheric Environment18, (016) 3 Hynwoo Shim, Hongseok Kim, Yonghwan Kwack, Minkang Moon, Hynsk Lee, Jinwook Song, Jongho Kim, eomshik Kim Elyong Kim: Inverter Modeling Inclding Non-Ideal IGT haracteristics in Hybrid Electric Vehicle for ccrate EMI Noise Prediction IEEE International Symposim on Electromagnetic ompatibility (SEM015), Dresden, Germany, (015) 4 Hamza Djilali, Pahlevaninezhad Majid, Jain Praveen K: Implementation of a novel digital active EMI techniqe in a DSP-based D-D digital controller sed in Electric Vehicle (EV) IEEE Transactions on Power Electronics 8, (013) 5 li Emadi, Sheldon S Williamson, lireza Khaligh: Power electronics intensive soltions for advanced electric, hybrid electric, fel cell vehiclar power systems IEEE Transactions on Power Electronics1: (006) 6 Yon Hee Lee, Nasiri : nalysis modeling of condctive EMI noise of power electronics converters in electric hybrid electric vehicles Proceedings of Twenty-Third nnal IEEE pplied Power Electronics onference Exposition, PE 008, stin, TX, nited states, (008) 7 Holmes D G, Lipo T : Plse width modlation for power converters: principles practice IEEE Press, S(003) 8 Kaboli Shahriyar, Mahdavi Javad, gah li: pplication of rom PWM techniqe for redcing the condcted electromagnetic emissions in active filters IEEE Transactions on Indstrial Electronics 54, 333~343(007) 9 Na S H, Jng Y G, Lim Y, Yang, SH: Redction of adible switching noise in indction motor drives sing rom position space vector PWM IEE Proceedings Electric Power pplications ~00 (00) 10hen Goqiang, Kang Jianli, Zhao Jnwei: Nmeric analysis simlation of space vector plse width modlation dvances in Engineering Software65,60-65(013) opyright 017 SERS 93