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current (i,, ), (c) Compensation current (i a)» (d) Source

Figure 5 current (i,, ), (c) Compensation current (i a)» (d) Source

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The functional diagram of a shunt active power filter, based on a _ voltage source converter, for the compensation of current harmonics generated by the nonlinear load is shown in Fig.l. A three phase voltage source inverter is employed as a shunt active power filter. The inverter is controlled through two controllers. A fast inner loop is used to control the shape of the line currents, forcing them to be of the same shape, and in phase with, the phase voltages. The inner current loop is based on a sliding-mode controller, which is conceptually Fig.2 Outer control loop for dc-link voltage control
The functional diagram of a shunt active power filter, based on a _ voltage source converter, for the compensation of current harmonics generated by the nonlinear load is shown in Fig.l. A three phase voltage source inverter is employed as a shunt active power filter. The inverter is controlled through two controllers. A fast inner loop is used to control the shape of the line currents, forcing them to be of the same shape, and in phase with, the phase voltages. The inner current loop is based on a sliding-mode controller, which is conceptually Fig.2 Outer control loop for dc-link voltage control
Fig.1 Functional block diagram of SAPF distortion (THD) of source current in the above three operating conditions of supply voltage. Here MATLAB- SIMULINK results are validated with real-time performance analysis in the RT-LAB simulator. It is one of the most promising real-time simulation tools for all practical applications.
Fig.1 Functional block diagram of SAPF distortion (THD) of source current in the above three operating conditions of supply voltage. Here MATLAB- SIMULINK results are validated with real-time performance analysis in the RT-LAB simulator. It is one of the most promising real-time simulation tools for all practical applications.
Fig.3 Equivalent Circuit structure for a single phase converter
Fig.3 Equivalent Circuit structure for a single phase converter
broken into three first-order independent systems which are expressed as where x denotes the phase. To apply a sliding mode control theory to the active power filter, the sliding surfaces, or the trajectories, must be defined in such a way that we wish the system to follow. Here the trajectories are defined using the following two control strategies.
broken into three first-order independent systems which are expressed as where x denotes the phase. To apply a sliding mode control theory to the active power filter, the sliding surfaces, or the trajectories, must be defined in such a way that we wish the system to follow. Here the trajectories are defined using the following two control strategies.
capacitance of dc bus, v,,,, is the reference DC bus f and L, correspond to the link inductor model, C is the used in the simulation are shown in Table 1, where R f
capacitance of dc bus, v,,,, is the reference DC bus f and L, correspond to the link inductor model, C is the used in the simulation are shown in Table 1, where R f
Figs.9-10 shows the performance of SAPF under DCC and ICC with unbalanced source voltage conditions. It is observed from Fig.9 (d) and Fig.10 (d) that source current is
Figs.9-10 shows the performance of SAPF under DCC and ICC with unbalanced source voltage conditions. It is observed from Fig.9 (d) and Fig.10 (d) that source current is
Amplitudes of different harmonic orders on to 25th) for balanced source voltage condition are analysed using the above two methods, which are shown in Table 3, It can be found that the amplitude of harmonics is minimum in ICC as compared to DCC showing the higher priority of former one.
Amplitudes of different harmonic orders on to 25th) for balanced source voltage condition are analysed using the above two methods, which are shown in Table 3, It can be found that the amplitude of harmonics is minimum in ICC as compared to DCC showing the higher priority of former one.
Source current harmonics during balanced source- voltage condition 5 Validation with Real-time Digital Simulator
Source current harmonics during balanced source- voltage condition 5 Validation with Real-time Digital Simulator
supply condition, (a) Source voltage( v, ), (b) Load
supply condition, (a) Source voltage( v, ), (b) Load
balanced case. From THD% analysis, it is found that source current THD in DCC scheme is 2.11% and in ICC scheme it is 1.95% using balanced condition. Also in unbalanced and distorted case, they are found to be (DCC=4.12%, ICC=3.13%) and (DCC=4.13%, ICC=3.15%) respectively. Finally a comparative assessment has been performed using MATLAB- SIMULINK and RTDS hardware as shown in Fig.20, and it is observed that the superiority of ICC over DCC under all operating conditions of supply voltage in SAPF.
balanced case. From THD% analysis, it is found that source current THD in DCC scheme is 2.11% and in ICC scheme it is 1.95% using balanced condition. Also in unbalanced and distorted case, they are found to be (DCC=4.12%, ICC=3.13%) and (DCC=4.13%, ICC=3.15%) respectively. Finally a comparative assessment has been performed using MATLAB- SIMULINK and RTDS hardware as shown in Fig.20, and it is observed that the superiority of ICC over DCC under all operating conditions of supply voltage in SAPF.
Fig.14(a) RT-lab real-time simulation waveform under Balanced supply for (a) source voltage (scale: 200v/div), (b Load current (scale:55A/div), Compensation current (scale:35A/div), Source current (scale:66A/div), DC link voltag (scale:600v/div) for DCC Control schemes.
Fig.14(a) RT-lab real-time simulation waveform under Balanced supply for (a) source voltage (scale: 200v/div), (b Load current (scale:55A/div), Compensation current (scale:35A/div), Source current (scale:66A/div), DC link voltag (scale:600v/div) for DCC Control schemes.
Fig.15(a) RT-lab real-time simulation waveform under balanced supply for (a) source voltage (scale: 200v/div), (b) Load current (scale:55A/div), Compensation current (scale:35A/div), Source current (scale:55A/div), DC link voltage (scale:600v/div) for ICC Control schemes
Fig.15(a) RT-lab real-time simulation waveform under balanced supply for (a) source voltage (scale: 200v/div), (b) Load current (scale:55A/div), Compensation current (scale:35A/div), Source current (scale:55A/div), DC link voltage (scale:600v/div) for ICC Control schemes
Fig.16(a) RT-lab real-time simulation waveform under unbalanced supply for (a) source voltage (scale: 200v/div), (b Load current (scale:67A/div), Compensation current (scale:38A/div), Source current (scale:80A/div), DC link voltage (scale:600v/div) for DCC Control schemes
Fig.16(a) RT-lab real-time simulation waveform under unbalanced supply for (a) source voltage (scale: 200v/div), (b Load current (scale:67A/div), Compensation current (scale:38A/div), Source current (scale:80A/div), DC link voltage (scale:600v/div) for DCC Control schemes
Fig.17(a) RT-lab real-time simulation waveform under unbalanced supply for (a) source voltage (scale: 200v/div), (b Load current (scale:67A/div), Compensation current (scale:38A/div), Source current (scale:80A/div), DC link voltage (scale:600v/div) for ICC Control schemes
Fig.17(a) RT-lab real-time simulation waveform under unbalanced supply for (a) source voltage (scale: 200v/div), (b Load current (scale:67A/div), Compensation current (scale:38A/div), Source current (scale:80A/div), DC link voltage (scale:600v/div) for ICC Control schemes
Fig.18(a) RT-lab real-time simulation waveform under distorted supply for (a) source voltage (scale: 200v/div), (b) Load current (scale:111A/div), Compensation current (scale:58A/div), Source current (scale:120A/div), DC link voltage (scale:600v/div) for DCC Control schemes.
Fig.18(a) RT-lab real-time simulation waveform under distorted supply for (a) source voltage (scale: 200v/div), (b) Load current (scale:111A/div), Compensation current (scale:58A/div), Source current (scale:120A/div), DC link voltage (scale:600v/div) for DCC Control schemes.
Fig.20 THD of Source Current for Direct sliding and Indirect sliding control strategies Using MATLAB-
Fig.20 THD of Source Current for Direct sliding and Indirect sliding control strategies Using MATLAB-
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EngineeringSliding mode control
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