Chapter 5 DC to AC Converters
5.2 Voltage source inverters
5.3 Current source inverters
5.4 Multiple- inverter connections and multi- level inverters
5.1 Commutation types
Basic operation principle of inverters
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
Fully- controlled devices: GTO, IGBT, MOSFET
Phase- controlled rectifier,Phase- controlled AC controller,
(1) Load commutation
(2) Forced commutation (capacitance commutation)
Another classification of commutations
2 classes of inverters
5.2 Voltage source inverter (VSI)
DC side is constant voltage, low impedance (voltage source, or bulk cap)
AC side voltage is square wave or quasi- square wave.
AC side current is determined by the load.
Anti- parallel diodes are necessary to provide energy feedback path.
(freewheeling diodes , feedback diodes)
Single-phase half bridge VSI
The current conducting path is determined by the polarity of load voltage and load current. (This is true for analysis of many power electronics circuits.)
The magnitude of output square- wave voltage is Ud/2.
Single-phase full bridge VSI
Fourier series extension of output voltage
Magnitude of output voltage fundamental component
Effective value of output voltage fundamental component
Output voltage control by phase-shift
Inverter with center- tapped transformer—push-pull inverter
Basic equations to obtain voltage
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
5.3 Current source inverter (CSI)
DC side is constant current , high impedance (current source, or large inductor)
AC side current is quasis-quare wave. AC side voltage is determined by the load.
No anti-parallel diodes are needed. sometimes series diodes are needed to block reverse voltage for other power semiconductor devices.
Single-phase bridge CSI
Parallel Resonant Inverter
Three- phase self-commutated CSI
Three- phase force- commutated CSI
Three- phase load-commutated CSI
5.4 Multiple- inverter connections and multi-level inverters
Series connection of 2 single- phase VSIs
Series connection of 2 3- phase VSIs
Multi-level Inverters 3- level inverter
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time：32 month ago
tag：power electronics circuits,ac converters,operation principle,source inverters,full bridge,dc side,feedback path,voltage source,load voltage,fundamental component,square wave,commutation,voltage control,line voltage,output voltage,phase shift,current source,diodes,quantitative analysis,three phase