Inverters with Capacitive Output Impedance (C-inverters)
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1 Inverters with Capacitive Output Impedance (C-inverters) Yu Zeng Supervisor: Prof. Qing-Chang Zhong Department of Automatic Control and System Engineering The University of Sheffield UKACC PhD Presentation Showcase
2 Content Background and Motivation Controller Design to Achieve C-Inverters Experimental Results Conclusion and Future Work UKACC PhD Presentation Showcase Slide 2
3 Background and Motivation An inverter is an electrical power converter that changes a DC source into an AC source. DGs and renewable energy sources Smart grids UKACC PhD Presentation Showcase Slide 3
4 Background and Motivation An inverter is an electrical power converter that changes a DC source into an AC source. Inverters are widely used to integrate the distributed generations (DGs) and renewable energy sources into smart grids. DGs and renewable energy sources Smart grids UKACC PhD Presentation Showcase Slide 4
5 Background and Motivation An inverter is an electrical power converter that changes a DC source into an AC source. Inverters are widely used to integrate the distributed generations (DGs) and renewable energy sources into smart grids. DGs and renewable energy sources Smart grids How to control inverters to achieve good power quality is critical for these applications. The output impedance of the inverter plays an important role. UKACC PhD Presentation Showcase Slide 5
6 Background and Motivation The output Impedance of the inverter is the equivalent impedance looking back into the output terminals of the inverter. UKACC PhD Presentation Showcase Slide 6
7 Background and Motivation The output Impedance of the inverter is the equivalent impedance looking back into the output terminals of the inverter. L-inverter UKACC PhD Presentation Showcase Slide 7
8 Background and Motivation The output Impedance of the inverter is the equivalent impedance looking back into the output terminals of the inverter. It could be designed to be resistive R-inverter L-inverter UKACC PhD Presentation Showcase Slide 8
9 Background and Motivation The output Impedance of the inverter is the equivalent impedance looking back into the output terminals of the inverter. It could be designed to be resistive R-inverter R-inverters achieve better power quality than L-inverters. L-inverter UKACC PhD Presentation Showcase Slide 9
10 Background and Motivation The output Impedance of the inverter is the equivalent impedance looking back into the output terminals of the inverter. L-inverter It could be designed to be resistive R-inverter C-inverter? R-inverters achieve better power quality than L-inverters. Can the output impedance of the inverter be designed capacitive? UKACC PhD Presentation Showcase Slide 10
11 Background and Motivation The output Impedance of the inverter is the equivalent impedance looking back into the output terminals of the inverter. L-inverter It could be designed to be resistive R-inverter C-inverter? R-inverters achieve better power quality than L-inverters. Can the output impedance of the inverter be designed capacitive? Yes! UKACC PhD Presentation Showcase Slide 11
12 Background and Motivation The output Impedance of the inverter is the equivalent impedance looking back into the output terminals of the inverter. L-inverter It could be designed to be resistive R-inverter C-inverter? R-inverters achieve better power quality than L-inverters. Can the output impedance of the inverter be designed capacitive? Yes! Why do we need C-inverters? UKACC PhD Presentation Showcase Slide 12
13 Background and Motivation The output Impedance of the inverter is the equivalent impedance looking back into the output terminals of the inverter. L-inverter It could be designed to be resistive R-inverter C-inverter? R-inverters achieve better power quality than L-inverters. Can the output impedance of the inverter be designed capacitive? Yes! Why do we need C-inverters? They achieve better power quality than L-inverters and R-inverters. UKACC PhD Presentation Showcase Slide 13
14 Controller Design The output impedance of an inverter can be designed to be capacitive via the feedback of the filter inductor current through an integrator. UKACC PhD Presentation Showcase Slide 14
15 Controller Design The output impedance of an inverter can be designed to be capacitive via the feedback of the filter inductor current through an integrator. UKACC PhD Presentation Showcase Slide 15
16 Controller Design The output impedance of an inverter can be designed to be capacitive via the feedback of the filter inductor current through an integrator. uf u UKACC PhD Presentation Showcase Slide 16
17 Controller Design The output impedance of an inverter can be designed to be capacitive via the feedback of the filter inductor current through an integrator. uf u UKACC PhD Presentation Showcase Slide 17
18 Controller Design The output impedance of an inverter can be designed to be capacitive via the feedback of the filter inductor current through an integrator. uf u small Co UKACC PhD Presentation Showcase Slide 18
19 Controller Design The output impedance of an inverter can be designed to be capacitive via the feedback of the filter inductor current through an integrator. uf u small Co UKACC PhD Presentation Showcase Slide 19
20 Controller Design The output impedance of an inverter can be designed to be capacitive via the feedback of the filter inductor current through an integrator. uf u small Co C o could be designed to optimise the voltage quality: UKACC PhD Presentation Showcase Slide 20
21 Experimental Results The instantaneous Output Voltage (a) C-inverter (b) R-inverter The Output Voltage Total Harmonic Distortion (THD) (a) C-inverter (b) R-inverter UKACC PhD Presentation Showcase Slide 21
22 Conclusion and Future Work Conclusion: The output impedance of an inverter can be designed to be capacitive. C-inverters achieve better voltage quality than L-inverters and R- inverters. UKACC PhD Presentation Showcase Slide 22
23 Conclusion and Future Work Conclusion: The output impedance of an inverter can be designed to be capacitive. C-inverters achieve better voltage quality than L-inverters and R- inverters. Current Achievements: C o Design to optimise the voltage quality. Parallel operation of C-inverters. Active capacitors implemented by inverters. UKACC PhD Presentation Showcase Slide 23
24 Conclusion and Future Work Conclusion: The output impedance of an inverter can be designed to be capacitive. C-inverters achieve better voltage quality than L-inverters and R- inverters. Current Achievements: C o Design to optimise the voltage quality. Parallel operation of C-inverters. Active capacitors implemented by inverters. Future Work: Parallel operation of combinations of L-inverters, R-inverters and C-inverters. Find out an universal droop controller for inverters with different type of output impedance. UKACC PhD Presentation Showcase Slide 24
25 Acknowledgement EPSRC Grant EP/J01558X/1 on Developing Fundamental Theory and Enabling Technologies for Parallel Operation of Inverters to Facilitate Large-scale Utilisation of Renewable Energy. Industrial Partners: UKACC PhD Presentation Showcase Slide 25
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