Asian Institute of Technology, Energy field of study1 INTERCONNECTION OF PHOTOVOLTAIC BASED GENERATION AND ITS IMPACT ON STABILITY OF ELECTRIC POWER SYSTEM Committee: Dr. Mithulananthan Nadarajah (Chairman) Dr. Weerakorn Ongsakul Prof. Yaw-Juen Wang Presenter: Md.Rakibuzzaman Shah

Asian Institute of Technology, Energy field of study2 Presentation outline Objectives Background Introduction Results and Discussion Conclusions

Asian Institute of Technology, Energy field of study3 Introduction 1 Coal fired plants 2 Oil and Gas fired plants 3 Nuclear power plants Recently 4 Renewable energy based plants

Asian Institute of Technology, Energy field of study4 Introduction (cont.) Energy sustainability (Sustainable grid) Energy security issues Environmental degradation

Asian Institute of Technology, Energy field of study5 Introduction (cont.)

Asian Institute of Technology, Energy field of study6 Background 60% increment

Asian Institute of Technology, Energy field of study7 Background (Cont.) Intermittent nature of solar radiation. Power electronic device at the terminal.

Asian Institute of Technology, Energy field of study8 Objectives To assess the impact of photovoltaic generator on power system oscillatory stability. To assess the impact of photovoltaic generator on power system static voltage stability. To assess the economical evaluation of the photovoltaic generator.

Asian Institute of Technology, Energy field of study9 Results and Discussion Without PV generator With PV generator Effect of PV generator on IEEE-14 Bus Test System Oscillatory Stability

Asian Institute of Technology, Energy field of study10 Results and Discussion (Cont.) Effect of PV on EM modes in IEEE-14 Bus Test System Oscillatory Stability

Asian Institute of Technology, Energy field of study11 Results and Discussion (Cont.) Effect of radiation level on damping ratio of the critical modes Oscillatory Stability No change in damping ratio of the critical modes

Asian Institute of Technology, Energy field of study12 Results and Discussion (Cont.) Modes related to generator Damping ratio with out PV Damping ratio with PV G G G Most associated states Eigenvalues with out PV Eigenvalues with PV delta_syn1, omega_syn ± ± delta_syn2, omega_syn ± ± Eigenvalues of Two-area Test System without PV generator Oscillatory Stability

Asian Institute of Technology, Energy field of study13 Results and Discussion (Cont.) Damping ratio of EM modes without PVDamping ratio of EM modes with PV Effect of PV generator on Bangladesh Power System Oscillatory Stability

Asian Institute of Technology, Energy field of study14 Results and Discussion (Cont.) LM of IEEE-14 Bus System at base caseLM of IEEE-14 Bus System with PV Loading margin improved (6%) Static Voltage Stability

Asian Institute of Technology, Energy field of study15 Results and Discussion (cont.) Voltage profile at LF = 0 Voltage profile near to the collapse point Static Voltage Stability

Asian Institute of Technology, Energy field of study16 Results and Discussion (cont.) CaseLM (pu) Base With PHV(250 W/m 2 ) With PHV (400 W/m 2 ) With PHV (550 W/m 2 ) With PHV (750 W/m 2 ) Effect of radiation on system loading margin Effect of PV generator position on system LM Better LM than without PV Static Voltage Stability

Asian Institute of Technology, Energy field of study17 Results and Discussion (Cont.) LM of Bangladesh Power System at base case LM of Bangladesh Power System with PV Static Voltage Stability

Asian Institute of Technology, Energy field of study18 Results and Discussion (Cont.) Voltage profile at L.F = 0Voltage profile near to the collapse point Static Voltage Stability

Asian Institute of Technology, Energy field of study19 Results and Discussion (Cont.) NPC with emission taxEffect of different CO 2 tax Economical Evaluation

Asian Institute of Technology, Energy field of study20 Conclusions PV generator add more damping to the critical modes of the power system. Critical modes of the power system are not affected by the radiation level change. PV generator improves the loading margin of the power system. Even at lower radiation level, it provides better loading margin than the base case (Without PV). Comparatively lower CO 2 tax makes PV option viable than diesel in case of Bangladesh. Based on fuel availability and radiation level, different emission taxes can be implemented at different system buses.

Asian Institute of Technology, Energy field of study21 Thank you all