《电子电力技术》（英文版） Chapter 8 Composite Converters

Power electronics Chapter 8 Composite Converters

Power Electron cs i 1 Chapter 8 Composite Converters PPoowwee rr EE ll eeccttrroo nn ii ccss

PEREC The concept of composite converter Composite converter Combination of two or more converters in cascaded connection Indirect ac to ac converters (AC-DC-AC converters) Composite converters ndirect dc to dc converters (Isolated dC to DC converters) 2

Power Electron cs i 2 The concept of composite converter The concept of composite converter Composite converter: Composite converter: Combination of two or more converters in cascaded Combination of two or more converters in cascaded connection connection Indirect AC to AC converters Indirect AC to AC converters (AC -DC -AC converters) AC converters) Composite converters Composite converters Indirect DC to DC converters Indirect DC to DC converters (Isolated DC (Isolated DC to DC converters) to DC converters)

8. 1 Indirect ac to Ac converters (AC-DC-AC converters) Classifications 4 According to type of the dc links Voltage-source type AC-DC-AC converters Current-source type 4 According to whether output voltage and frequency is variable: Variable voltage variable frequency WF AC-DC-AC converters (AC-DC-AC frequency converters) Constant voltage constant frequen (CVCF) 3

Power Electron cs i 3 8.1 Indirect AC to AC converters Indirect AC to AC converters (AC -DC -AC converters) AC converters) Classifications Classifications According to type of the DC links: According to type of the DC links: Voltage Voltage -source type source type AC -DC -AC converters AC converters Current Current-source type source type Variable voltage variable frequency Variable voltage variable frequency (VVVF) (AC -DC -AC frequency converters) According to whether output voltage and frequency is According to whether output voltage and frequency is variable: AC -DC -AC converters AC converters AC frequency converters) Constant voltage constant frequency Constant voltage constant frequency (CVCF) variable:

PEREC 8.1.1 Configurations of AC-DC-Ac converters Configurations with one-direction power flow AC AC AC AC A ource Load Source Load Voltage-source type Current-source type

Power Electron cs i 4 8.1.1 Configurations of AC Configurations of AC -DC -AC converters AC converters Configurations with one Configurations with one -direction power flow direction power flow AC Load AC Source AC Load AC Source Voltage Voltage -source type source type Current Current-source type source type

Configuration with regenerative energy dissipating circuit AC 木 AC 0 Source Load 4 Braking transistor and braking resistor 5

Power Electron cs i 5 Configuration with regenerative energy Configuration with regenerative energy dissipating circuit dissipating circuit AC Load AC Source V 0 R 0 Braking transistor and braking resistor Braking transistor and braking resistor

PEREC Configurations with regenerative power feedback through inversion-mode thyristor rectifier circuit AC AC Source Load AC AC Source Load Voltage-source type Current-source type

Power Electron cs i 6 Configurations with regenerative power feedback Configurations with regenerative power feedback through inversion through inversion -mode thyristor rectifier circuit mode thyristor rectifier circuit AC Load AC Source AC Load AC Source I d Ud UL Voltage Voltage -source type source type Current Current-source type source type

PEREC Configurations realizing bi-directional power flow through double-sided PWM converters AC U Source bo VI Source Load 本本本 平平 Voltage-source type Current-source type 7

AC Load AC Source U V W a b c Source Load Power Electron cs i Configurations realizing bi Configurations realizing bi -directional power directional power flow through double flow through double -sided PWM converters sided PWM converters Voltage Voltage -source type source type Current Current-source type source type 7

peRec 8.1.2 Major Applications of AC-DC-AC frequency converters(WF converters) Adjustable speed Ac motor drives 4 Advantages of ac motors over dc motors 4 Energy saving on AC motors 4 High-performance AC motor drives Control of Ac motors driven by AC-DC-AC frequency converters (WVF converters) 4 Constant voltage frequency ratio control 4 Slip frequency control ◆∨ ector contro ◆ Direct torque control

Power Electron cs i 8 8.1.2 Major Applications of AC Major Applications of AC -DC -AC frequency converters (VVVF converters) frequency converters (VVVF converters) Adjustable speed AC motor drives Adjustable speed AC motor drives Advantages of AC motors over DC motors Advantages of AC motors over DC motors Energy saving on AC motors Energy saving on AC motors High -performance AC motor drives performance AC motor drives Control of AC motors driven by AC Control of AC motors driven by AC -DC -AC frequency AC frequency converters (VVVF converters) converters (VVVF converters) Constant voltage frequency ratio control Constant voltage frequency ratio control Slip frequency control Slip frequency control Vector control Vector control Direct torque control Direct torque control

PEREC 8.1.3 Major Applications of CVcF converters Uninterruptible power supplies(UPs) 4 Basic configuration of UPS Rectifier nverter Electricity utility 卡Load urce

Power Electron cs i 9 8.1.3 Major Applications of CVCF converters Major Applications of CVCF converters Uninterruptible power supplies (UPS) Uninterruptible power supplies (UPS) Basic configuration of UPS Basic configuration of UPS Source E lectr ici ty utility Re c tifie r Inv erte r Lo a d

PEREC UPS with back-up energy source electricity utility Rectifier Inverter Load Diesel Engine lourd

Power Electron cs i 10 UPS with back UPS with back -up energy source up energy source Source E l e ctricity utility Re ctifie r Inverter Lo a d D iesel Engine S 1 2