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Three level inverters use multiple lower voltage DC sources connected in series to generate a stepped voltage waveform and reduce harmonic content. They have applications in high power systems and renewable energy. The diode clamped multilevel inverter connects capacitors between each level through clamping diodes. It requires m-1 capacitors and 2m-2 switching devices for an m level inverter. While it produces a high quality output with less harmonics, it has disadvantages such as unequal switch ratings and difficulties controlling real power flow.
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An improved modulation technique suitable for a three level flying capacitor ...
This research paper introduces an innovative modulation technique for controlling a 3-level flying capacitor multilevel inverter (FCMLI), aiming to streamline the modulation process in contrast to conventional methods. The proposed
simplified modulation technique paves the way for more straightforward and
efficient control of multilevel inverters, enabling their widespread adoption and
integration into modern power electronic systems. Through the amalgamation of
sinusoidal pulse width modulation (SPWM) with a high-frequency square wave
pulse, this controlling technique attains energy equilibrium across the coupling
capacitor. The modulation scheme incorporates a simplified switching pattern
and a decreased count of voltage references, thereby simplifying the control
algorithm.
Design and optimization of ion propulsion drone
Electric propulsion technology is widely used in many kinds of vehicles in recent years, and aircrafts are no exception. Technically, UAVs are electrically propelled but tend to produce a significant amount of noise and vibrations. Ion propulsion technology for drones is a potential solution to this problem. Ion propulsion technology is proven to be feasible in the earth’s atmosphere. The study presented in this article shows the design of EHD thrusters and power supply for ion propulsion drones along with performance optimization of high-voltage power supply for endurance in earth’s atmosphere.
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Mechanical Engineering on AAI Summer Training Report-003.pdf
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Anik Tarafder_EE(B)_83.pdf
- 1. THREE LEVEL INVERTERS By Anik Tarafder EE(B),83
- 2. NEED FOR MULTILEVEL INVERTER High Power application Staircase waveform Input Current Switching Frequency Renewable Energy sources Only disadvantage – More Switches, Cost
- 3. BASIC CONCEPT Use of Power Semiconductor Switches in series - with several lower Voltage dc sources - staircase voltage waveform Lower voltage dc sources – Capacitors, Batteries, PV cells
- 4. TYPES Diode Clamped Multilevel Inverter Flying Capacitor Multilevel Inverter Cascade Multilevel Inverter
- 5. DIODE CLAMPED MULTILEVEL INVERTER Let, m → number of nodes or levels Then, We require, (m-1) → Capacitors 2(m-1) → Switching Devices Example :- m= 6 Therefore, Capacitors – 5 Switching Devices - 10
- 8. OUTPUT VOLTAGE WAVEFORM OF THREE LEVEL INVERTER
- 9. FEATURES OF DIODE CLAMPED INVERTER High Voltage rating for blocking diodes Unequal Switch device Rating Capacitor Voltage Unbalance
- 10. Advantage & Disadvantage ADVANTAGES ➢Harmonic Content is less-filters avoided ➢Efficiency – High ➢Control method - simple DISADVANTAGES ➢Difficult to control the real power of individual converter ➢Need for more clamping diodes
- 11. Thank You