# A Comparative Study between DPC and DPC-SVM Controllers Using dspace (DS1104)

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2 IJECE ISSN: High sampling frequency needed for digital implementation of hysteresis comparators Fast microprocessor and A/D converters requirements Therefore, it was difficult to implement VF-DPC in industry. But all of the above drawbacks can be eliminated when instead of the switching table a PWM voltage modulator is applied [8]. 2. DIRECT POWER CONTROL Direct power control is based on the same control principles as in the direct torque control technique (DTC). In DTC, it s the electromagnetic torque and the rotor flux which are directly controlled, while in DPC, it s the stator active and reactive powers that are directly controlled [9]. Also, in DPC no internal current control loops or PWM modulator block are required, because the converter switching states are selected by a switching table based on the instantaneous errors between the commanded and measured values of active and reactive power. Therefore, the main feature of the DPC implementation is a correct and fast extraction of the active and reactive power [1]. Figure 1. Configuration of DPC Controller for PWM converter [6] 2.1. Instantaneous Power Source Calculation the active and reactive powers are obtained by the following equations P = v a i a + v b i b + v c i c (1) Q = 1 3 [v a (i c i b ) + v b (i a i c ) + v c (i b i a )] (2) 2.2. Line Voltage Vector Position The phase of the power-source voltage vector is converted to the sector signal θ i. For this purpose, the stationary coordinates are divided into 12 sectors, as shown in Table I, and the angle can be deduced from equation (3) [5]. ( vβ ) θ = arctan (3) v α 2.3. Switching Table the selection of the adequate vector is determined by the following table according to the variation in the active and reactive power with the position of voltage vector. A Comparative Study between DPC and DPC-SVM Controllers Using dspace DS1104 (Adel Mehdi)

3 324 ISSN: Table 1. Switching Table dq qp θ 1 θ 2 θ 3 θ 4 θ 5 θ 6 θ 7 θ 8 θ 9 θ 10 θ 11 θ DIRECT POWER CONTROL WITH PWM The DPC-SVM with constant switching frequency uses closed-loop power control, as shown in Figure 2. The commanded reactive power Q ref set to zero for unity power factor operation and delivered from the outer PI dc voltage controller. The reference active power P ref and reactive power Q ref which are in the DC frame and flowing between the supply and the dc link are compared with the calculated P mes and Q mes respectively. The errors are delivered to a PI controller to eliminate steady-state error, and the output signals are transformed to the fixed frame and used for switching signals generation by the space-vector modulator (SVM)[10]. Figure 2. Configuration of DPC-SVM Controller for PWM converter 3.1. Synthesis of Active and Reactive Power Controllers The synthesis of active and reactive power controllers can be done analytically using a simplified model. In this model the switching waveforms created by the PWM converter are replaced by its average value within the switching period [3].The active and reactive power in (dq) coordinates has the form after orientation the frame. Figure 3. Simplified block diagram[8] IJECE Vol. 4, No. 3, June 2014:

4 IJECE ISSN: P = UI qs (4) Q = UI ds (5) 4. SIMULATION RESULTS 4.1. Direct Power Control 4.2. Direct Power Control with Modulation (a) (b) (c) (d) (e) (f) Figure 4. Simulated basic signal waveforms and line current harmonic spectrum under purely sinusoidal line voltage for DPC. From the top: instantaneous active and reactive power, DC link voltage, line current, and harmonic spectrum of the line current (THD = 4.87%). (g) (h) Figure 5. Simulated basic signal waveforms and line current harmonic spectrum under purely sinusoidal line voltage for DPC-SVM. From the top: instantaneous active and reactive power, DC link voltage, line current, and harmonic spectrum of the line current (THD = 3.87%). A Comparative Study between DPC and DPC-SVM Controllers Using dspace DS1104 (Adel Mehdi)

5 326 ISSN: EXPERIMENTAL RESULTS 5.1. Direct Power Control 5.2. Direct Power Control with Modulation (a) (b) (c) (d) (e) (f) Figure 6. Experimental results for DPC. From the top: instantaneous active and reactive power, DC link voltage, line current, and a focused part of the line current. (g) (h) Figure 7. Experimental results for DPC-SVM. From the top: instantaneous active and reactive power, DC link voltage, line current, and a focused part of the line current. 6. EXPERIMENTAL SYSTEM CONFIGURATION An experimental study has been developed to examine operating characteristics of both techniques DPC and DPC-SVM. The power circuit of the PWM converter is constituted by an insulated gate bipolar transistor (IGBT)- IJECE Vol. 4, No. 3, June 2014:

7 328 ISSN: CONCLUSION This paper has described two concepts to improve the total power factor and efficiency of the PWM converter. The first method is direct instantaneous active and reactive power control of the converter, in this method the active and reactive power can be regulated directly by relay control of the power, which is implemented by hysteresis comparators and a switching table. In this configuration, the errors between the power commands and the feedback signals are compared by the hysteresis elements, and the specific switching state of the converter is appropriately selected by the switching table, so that the errors can be restricted within the hysteresis bands. Also it is shown that DPC-SVM has proven excellent performance and verifies the validity of the proposed control system. The DPC-SVM system constitutes a viable alternative to the conventional control strategies and it has the following features and advantages: Lower sampling frequency (than a conventional DPC) Good dynamic response Offers sinusoidal line currents (low THD), for ideal and distorted line voltage Constant switching frequency ACKNOWLEDGEMENT we would like to thanks all members of (Laboratoire de l électrotechnique de Constantine LEC) for your helps to complete this work. REFERENCES [1] Noguchi et al. direct power control of PWM converter without power-source voltage sensors. Industry Applications, IEEE Transactions on, 34(3): , [2] Kazmierkowski. control strategies for PWM rectifier/inverter-fed induction motors. In Industrial Electronics, ISIE Proceedings of the 2000 IEEE International Symposium on, volume 1, page TU15 TU23. IEEE, [3] Lechat. voltage oriented control of three-phase boost PWM converters [4] Malinowski et al. a comparative study of control techniques for PWM rectifiers in AC adjustable speed drives. Power Electronics, IEEE Transactions on, 18(6): , [5] Serpa et al. a modified direct power control strategy allowing the connection of three-phase inverters to the grid through LCL filters. Industry Applications, IEEE Transactions on, 43(5): , [6] Serpa et al. virtual-flux direct power control for mains connected three-level npc inverter systems. In Power Conversion Conference-Nagoya, PCC 07, page IEEE, [7] Hu et al. direct active and reactive power regulation of grid-connected DC/AC converters using sliding mode control approach. Power Electronics, IEEE Transactions on, 26(1): , [8] Malinowski et al. simple direct power control of three-phase PWM rectifier using space-vector modulation (DPC-SVM). Industrial Electronics, IEEE Transactions on, 51(2): , [9] Tremblay et al. direct power control of a DFIG-based WECS with active filter capabilities. In Electrical Power & Energy Conference (EPEC), 2009 IEEE, page 1 6. IEEE, [10] Restrepo et al. a simple switch selection state for SVM direct power control. In Industrial Electronics, 2006 IEEE International Symposium on, volume 2, page IEEE, BIOGRAPHY OF AUTHOR Adel Mehdi is a Ph.D. student and member at the electro-technique laboratory of Constantine LEC with Master of management and transformation of Electrical Energy from University of Constantine 1 Algeria (2011). He obtained Licence Degree in Electrical Engineering from Institute the sciences of Technology in His researches are in fields of control systems, digital signal processing,direct power control, microprocessors, renewable energy, and micro-grids. He is affiliated with IEEE as student member from 2012.and at university agency of francophone AUF from IJECE Vol. 4, No. 3, June 2014:

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