Comparative Evaluation of Three Phase Three Level Neutral Point Clamped Z-Source Inverters using Advanced PWM Control Strategies
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1 International Journal of Electronic and Electrical Engineering. ISSN Volume 5, Number 3 (2012), pp International Research Publication House Comparative Evaluation of Three Phase Three Level Neutral Point Clamped Z-Source Inverters using Advanced PWM Control Strategies K. Sreekanth, S. Nagaraja Rao and D.V. Ashok Kumar Dept. of EEE, SDIT, Nandyal, sreekanth266@gmail.com Dept. of EEE, RGMCET, Nandyal nagarajraomtech@gmail.com Dept. of EEE, SDIT, Nandyal principal.sdit@gmail.com Abstract Three-level Z-source inverters are recent single-stage topological solutions proposed for buck-boost energy conversion with all favorable advantages of three-level switching retained. Despite their effectiveness in achieving voltage buck-boost conversion, existing three-level Z-source inverters use two impedance networks and two isolated dc sources, which can significantly increase the overall system cost and require a more complex modulator for balancing the network inductive voltage boosting. Offering a number of less costly alternatives, this paper presents the design and control of two threelevel Z-source inverters, whose output voltage can be stepped down or up using only a single impedance network connected between the dc input source and either a neutral-point-clamped (NPC) or dc-link cascaded inverter circuitry. This paper investigates the carrier based modulation schemes (SPWM and Modified SVPWM) of three-level three phase Z-source inverters with either two Z-source networks or single Z-source network connected between the dc sources and inverter circuitry. With the proper offset added for achieving both optimized harmonic performance and fundamental output voltage, the proposed modulation schemes of three-level Z-source inverters can satisfy the expected boost operation under unbalanced modulation conditions. The Simulation has been performed through Matlab/Simulink and relative simulation results with conventional method have been presented to validate the proposed method.
2 240 K. Sreekanth et al Index Terms Neutral-point clamped (NPC) Z-source inverters, PWM Schemes, THD. INTRODUCTION The Z-impedance network consists of L and C components connected in an X fashion. The firing control of the Z-source inverter includes the shoot through states. The Z- source inverter advantageously utilizes the shoot-through state to boost the DC bus voltage by gating on both the upper and lower switches of a phase leg. Three-level neutral-point-clamped (NPC) inverters, having many inherent advantages, are commonly used as the preferred topology for medium voltage ac drives [1], and have recently been explored for other low-voltage applications including grid-interfacing power converters and high-speed drive converters [2], [3]. Despite their generally favorable output performance, NPC inverters are constrained by their ability to perform only voltage-buck operation with buck-boost energy conversion, usually achieved by connecting various dc-dc boost converters to the front ends of the dc-ac inverters. These two-stage solutions are usually more costly and can be harder to control, since they involve more active and passive components. Offering a singlestage solution, [4], [5] propose the buck-boost Z-source NPC inverter, whose topology is illustrated in Fig. 1 (can be viewed as an extension from the two-level Z- source inverter proposed in [6]). Compared to the traditional NPC inverter, the inverter in Fig. 1 uses two additional Z-source impedance networks for boosting its dc input voltage from V dc to a higher dc link voltage for driving the inverter directly. Although theoretically feasible, the inverter in Fig. 1 is not a favorable economical solution, since it uses two isolated dc sources and a number of passive elements, which can significantly increase the cost, size and weight of the inverter. Fig.1 Topology of Z-source NPC inverter with two LC impedance networks. With the above-described disadvantages in view and aiming to offer better alternatives, this letter presents the design of a Z-source NPC inverter that use only half the passive elements. With the integration of an appropriate pulse-width
3 Comparative Evaluation of Three Phase Three Level Neutral Point 241 modulation (PWM) scheme, the proposed inverters can operate with the correct voltsec average and inductive voltage boosting produced at all instances, while using only the minimum of six device commutations per switching cycle for continuous PWM switching. Therefore, compared to the dual Z-source NPC inverter presented in [4], [5], the single Z-source inverters proposed in this letter have equally good Performance with only a slight degradation in high-frequency switching (not fundamental) performance expected. This is more than compensated by the reduced element count and lower system cost achieved by the inverters. Implementation wise, the inverters can be controlled using a generic alternative phase opposition disposition (APOD) carrier-based modulator with an appropriate triplen offset and time advance/delay added. OPERATIONAL PRINCIPLES OF SINGLE Z- SOURCE THREE- LEVEL INVERTERS Fig. 2 shows the topologies of the proposed Z- source NPC and DCLC inverters, where a single Z-source impedance network, consisting of a split inductor (L 1 and L 2 ) and two capacitors (C 1 and C 2 ) are connected between the input split-dc source (can be implemented using a single dc source and two series-connected capacitors) and inverter circuitry. Compared to the inverter topology shown in Fig. 1, the proposed Z- source inverters clearly have the advantage of using only half the passive components and only a single split-dc source, which can either be isolated or non-isolated. Although the system cost is not expected to drop by half, since the voltage rating of the dc capacitors needed by the proposed inverter is nearly double that of the inverter shown in Fig. 1 (current rating of the inductors remains unchanged), the saving is still expected to be relatively sizable. This is because the proposed inverters use only a single split-dc source, implying that isolation transformers and additional rectifier circuits needed by the inverter in Fig. 1 (if isolated dc power supplies are not readily available) are omitted. Fig.2: Topology of Z-source NPC inverter using only a single LC impedance networks.
4 242 K. Sreekanth et al Under voltage-buck operation, the Z-source inverters are controlled with their ac outputs transiting between the three distinct voltage levels of 0 V and using the phaseleg switching states shown in Table I, which in principle are similar to those assumed by a traditional three-level inverter. Alternatively, when voltage-boost operation is commanded, both inverters must function with an additional shoot-through state inserted. A visibly obvious method for introducing the shoot-through state is to turn ON all switches from the same phase-leg simultaneously (e.g., {SA1, SA 1 1, SA2, SA 1 2} in Fig.2) to give the simplified circuit representation shown in Fig. 3(a) with input diodes D1 and D2 open-circuited. (Note that the turning ON of all switches from a phase leg to effect a short circuit is not the minimal-loss method, as explained in Section III, where a better shoot-through technique is also presented.) It is inferred that the presented Z-source inverters do not need dead-time delay for shortcircuit protection, unlike most traditional inverters. Thus, the presented Z-source inverters are expected to perform better, since performance limitations commonly associated with dead-time delay are avoided. Fig. 3. Simplified representations of single Z-source inverters when in (a) shootthrough and (b) non-shoot-through states. Table 1. Switching states of Three level Z-Source NPC State Type ON Switches ON Diodes V A Non Shoot-through SA1,SA2 D1,D2 +Vi 2 Non Shoot-through SA2, SA1 D1,D2 DA1orDA2 0 NonShoot- through SA1, SA2 D1,D2 Vi 2
5 Comparative Evaluation of Three Phase Three Level Neutral Point 243 Shoot- through (not preferred) Shoot-through (preferred) SA1,SA2, SA1, SA SA1,SA2, DA2,DB1 SA1, SB2,SB1, SB2 0 Using the simplified circuit shown in Fig. 3(a) and assuming that VL1 = V L2 = V L and V C1 = V C2 = V C for a symmetrical network, the capacitive and inductive voltages of the single Z-source impedance network can be expressed as (1) during the shootthrough duration T 0. V L = V C (1) Upon reverting to a non-shoot-through state during interval T 1, the inverters resume the circuit representation shown in Fig. 3(b), where the inverter circuitry and external load are represented by a simplified current source. Using this circuit representation, the capacitive and inductive voltages are re-expressed as V L = 2V dc V C Averaging V L over a switching cycle T then gives V C = 2 V dc (1-T 0 /T)/(1-2 T 0 /T) (2) Using (2), the inverter dc-link voltage V i and peak ac output voltage V x ( x =A,B or C ) when in a non-shoot-through state are derived as V i = V C - V L = 2 V C 2 V dc = 2 V dc /(1-2 T 0 /T) V x = M V i /2 = M B V dc where M is modulation index and B is is the boost factor (B = 1/(1-2 T 0 /T)), which should be set to unity for voltage-buck operation and B > 1 for voltage-boost operation. MODULATION SCHEME FOR TWO LEVEL ZSI Being different from the balanced three-phase operation, the carrier-based references have to be generated using appropriate offset plus the primarily derived sine waves. For optimizing the harmonic performance, the expected offset in sine-triangle modulation has been induced in [11] which would be summarized here briefly to demonstrate the three phase operation clearly. The offset for two-level optimal switching can be mathematically expressed as: V 2, V > 0 V = V 2, V < 0 (V + V ) 2, V > 0 and V < 0 Where, V max = max(v a, V b V c ) and V min = min(v a, V b V c ). The offset for multilevel optimal switching therefore can be further derived from
6 244 K. Sreekanth et al Where For a three-phase-leg two level VSI, both continuous switching (e.g., centered SVM) and discontinuous switching (e.g., 60 discontinuous PWM) are possible with each having its own unique null placement at the start and end of a switching cycle and characteristic harmonic spectrum. The same strategies with proper insertion of shoot through modes could be applied to the three-phase-leg Z source inverter with each having the same characteristic spectrum as its conventional counterpart [3]. There are fifteen switching states of a three-phase-leg z-source inverter. Fig.4. Traditional switching pattern for 2-level Z-Source inverter Fig.5. Modified switching pattern of Z-Source inverter
7 Comparative Evaluation of Three Phase Three Level Neutral Point 245 To easily achieve this kind of shoot-through insertion for the whole fundamental period, the references can then be expressed as: Where /T = shoot through duty ratio. Where, X = A, B or C MODULATION SCHEMES FOR THREE LEVEL ZSI 4.1 Modulation Development for Three Level Z Source Inverter: In the proposed work of carrier-based implementation, the phase disposition PWM scheme is used. The rules for the phase disposition method, when the number of level m = 3, are The (m 1) = 2 carrier waveforms are arranged so that every carrier is in phase. The converter is switched to + Vdc when the reference is greater than both carrier waveforms. The converter is switched to zero when the reference is greater than the lower carrier waveform but less than the upper carrier waveform. The converter is switched to - Vdc when the reference is less than both carrier waveforms. In the carrier-based implementation at every instant of time the modulation signals are compared with the carrier and depending on which is greater, the definition of the switching pulses is generated. Fig. 6.Modulation of Traditional and ZSI of Three level
8 246 K. Sreekanth et al Fig.7: Pulse generation of Three Level ZSI using Sinusoidal Pulse Width Modulation. 4.2 Modified Reference Modulated Technique (SVPWM): In the SPWM scheme for three-level inverters, each reference phase voltage is compared with the triangular carrier and the individual pole voltages are generated, independent of each other. To obtain the maximum possible peak amplitude of the fundamental phase voltage, in linear modulation, a common mode voltage, Voffset1, is added to the reference phase voltages, where the magnitude of Voffset1 is given by ( Vmax Vmin ) V offset (4.1) Modified Reference with triangular carrier modulated technique for three level Inverters: In the proposed work, in the carrier-based implementation the phase disposition PWM scheme is used. For 3-level ZSI (m 1) = 2 carrier waveforms are arranged so that every carrier is in phase. In the carrier-based implementation at every instant of time the modulation signals are compared with the carrier and depending on which is greater, the definition of the switching pulses is generated. Fig.8: Pulse generation of Three Level ZSI using Modified Space vector Pulse Width Modulation.
9 Comparative Evaluation of Three Phase Three Level Neutral Point 247 V. SIMULATION RESULTS The 3- phase two level and three level Z source inverter configurations are simulated using MATLAB-SIMULINK tool box. The parameters used for z source inverter are given in the appendix. Different parameters which are considered for input voltage, voltage across capacitor, Inverter gain output voltage, line voltage and harmonic spectra etc 5.1. Simulation Results for 3-phase Three level Z Source Inverter using dual impedance networks Non Shoot-Through State for Three Level ZSI using SPWM at K=0 Fig.9.InputVoltage (V dc ) Fig.10. Voltage across Capacitor Fig.11.Inverter Gain Output Voltage Fig.12. Line Voltage of 3-level ZSI Fig.13. Line voltage THD
10 248 K. Sreekanth et al Non Shoot-Through State for Three Level ZSI using modified SVPWM at k=0 Fig.14. Voltage across Capacitor Fig.15.Inverter Gain Output Voltage Fig.16. Line Voltage for 3-level ZSI Fig.17. Line voltage THD Shoot-Through State for Three Level SPWM at K=0.2 Fig.18. Voltage across Capacitor
11 Comparative Evaluation of Three Phase Three Level Neutral Point 249 Fig.19.Inverter Gain Output Voltage Fig.20. Line Voltage of Three level ZSI Fig.21. Line voltage THD Shoot-Through State for Three Level Modified SVPWM at K=0.2 Fig.22. Voltage across Capacitor Fig.23.Inverter Gain Output Voltage Fig.24. Line Voltage
12 250 K. Sreekanth et al Fig.25.Line voltage THD 5.2. Simulation Results for 3-phase Three level Z Source Inverter using single impedance network Non Shoot-Through State for Three Level ZSI using SPWM At K=0 Fig.26.InputVoltage Fig.27. Voltage across Capacitor Fig.28.Inverter Gain Output Voltage Fig.29. Line Voltage of 3-level ZSI Fig.30. Line voltage THD
13 Comparative Evaluation of Three Phase Three Level Neutral Point Non Shoot-Through State for Three Level Modified SVPWM at k=0 Fig.31.Voltage across Capacitor Fig.32.Inverter Gain Output Voltage Fig.33. Line Voltage for 3-level ZSI Fig.34. Line voltage THD Shoot-Through State for Three Level SPWM at K=0.2 Fig.35. Voltage across Capacitor Fig.36.Inverter Gain Output Voltage
14 252 K. Sreekanth et al Fig.37. Line Voltage Fig.38. Line voltage THD Shoot-Through State for Three Level Modified SVPWM at K=0.2 Fig.39. Voltage across Capacitor Fig.40. Inverter Gain Output Voltage Fig.41. Line Voltage Fig.42.Line voltage THD
15 Comparative Evaluation of Three Phase Three Level Neutral Point 253 VI. Comparison of THD for different PWM techniques of 3-phase 3- level Z source inverter using dual and single impedance networks Table 2. Simulation parameters Parameters Specifications unit DC supply 200 V Modulation Index Output Frequency 50 Hz Switching Frequency 1000 Hz Shoot through C =C =C 1000 µf L = L = L 1 mh Load(Resistance) 10 Ώ Table.3 comparison of results for 3-level ZSI using dual impedance networks Switching state SPWM Modified SVPWM Fundamental % Fundamental output THD output voltage voltage Non Shoot-through (K=0) V i =60V, V 0 =60V Shoot-through (K=0.2) V i =60V, V 0 =100V % THD Boost factor Table.4 comparison of results for 3-level ZSI using single impedance networks Switching state SPWM Modified SVPWM Fundamental % Fundamental output THD output voltage voltage Non Shoot-through (K=0) V i =60V, V 0 =60V Shoot-through (K=0.2) V i =60V, V 0 =100V % THD Boost factor
16 254 K. Sreekanth et al The summary of THD and fundamental output voltage for various Z Source inverter topologies with their control strategies are presented. i.e., 3-Level Z source inverter with dual impedance networks and single impedance networks were simulated using SPWM and modified SVPWM with triangular carriers and it is concluded that 3-level z source inverter using single impedance network has given good fundamental output voltage(88.3v) with less THD (28.33%). Note: By increasing the Switching Frequency THD will decreases. Generally Switching Frequency is chosen in this paper is 1 khz but by using high switching frequency we will get the THD <5%. VII. CONCLUSION This paper presents the design of a Z-source NPC inverter that uses only half the passive elements. With the integration of an appropriate pulse-width modulation (PWM) scheme, the proposed inverters can operate with the correct volt-sec average and inductive voltage boosting produced at all instances, while using only the minimum of six device commutations per switching cycle for continuous PWM switching. Therefore, compared to the dual Z-source NPC inverter the proposed single Z-source inverter have equally good performance with good quality of output voltage and less THD. This is more than compensated by the reduced element count and lower system cost achieved by the inverters. REFERENCES [1] Fang Zheng Peng Alan Joseph,in Wang, Lihwa Chen Zhiguo Pan, Z-Source inverter for motor drives IEEE Trans. On Power Electronics Vol.20.No.4 July,2005. [2] F.Z.Peng, Z-Source inverter, IEEE Trans. Ind. Applicat.Mag.,vol.39,no.2,pp , Mar/Apr [3] Yu Tang, Shaojun Xie, Member, IEEE, Chaohua Zhang, And Zegang Xu, Improved Z- Source Inverter With Reduced Z-Source Capacitor Voltage Stress and Soft-Start Capability,IEEE Trans. On Power Electronics,vol.24,No.2,Feb [4] F.Z.Peng, X.Yuan, X.Fang, and Z.Qian, Z-Source /Inverter for adjustable speed drives, IEEE Power Electron, Lett, vol.1, no.2, pp.33-35, jun [5] Y.Kim and S.Sul, A Novel ride through system for adjustable speed drives using common-mode voltage, IEEE Trans. Ind. Applicat., vol.37, no.5, pp , sep/oct [6] A. Van Zyl, R. Spec, A. FAveluke, and S.Bhowmik, Voltage sag ride through for adjustable speed drives with active receivers, IEEE Trans. Ind. Applicat, vol.34, no.6, pp ,nov/dec,1998. [7] Fang Zheng Peng, Miaosen Shen, Zhaoming Qian Maximum Boost control of the Z-Source inverter, IEEE Trans. On Power Electronics, vol.20,no.4,july 2005.
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