电力电子技术第5版王兆安英文chapter04章节.ppt

Applications of Inverters Conversion of electric power from DC type energy sources to AC type load Battery Photovoltaic cell (Solar cell) Fuel cell As a part of composite converter AC-DC-AC frequency converter (for AC motor drive) AC-DC-AC constant-voltage constant-frequency converter (for uninterruptable power supplies) AC-DC-AC Converters for induction heating AC-DC-AC-DC switching power supplies Outline 4.1 Commutation types A classification of inverters Square-wave inverters (are discussed in this chapter) PWM inverters ( will be discussed in Chapter 6) The concept of commutation 4 types of commutation Load commutation Forced commutation  (capacitance commutation) Another classification of commutations 2 classes of inverters 4.2 Voltage source inverter (VSI) Single-phase half bridge VSI Single-phase full bridge VSI Single-phase full bridge VSI Fourier series extension of output voltage Magnitude of output voltage fundamental component Effective value of output voltage fundamental component Single-phase full bridge VSI Inverter with center-tapped transformer—push-pull inverter Three-phase VSI Three-phase VSI Three-phase VSI Fourier series extension of output line-to-line voltage Magnitude of output voltage (line-to-line) fundamental component Effective value of output voltage (line-to-line) fundamental component 4.3 Current source inverter (CSI) Single-phase bridge CSI Three-phase self-commutated CSI Three-phase force-commutated CSI Three-phase load-commutated CSI 4.4 Multiple-inverter connections  and multi-level inverters Series connection of 2 3-phase VSIs Multi-level Inverters Ways to deal with higher voltage and achieve better waveform Series connection of multiple converters Series connection of multiple switch devices Major type of multi-level inverters Neutral point clamped multi-level inverter Flying-capacitor multi-level inverter Cascade H-bridge( series connected H-bridges) In broad sense, previously discussed series connection