Digital Voltage and Current Controllers for Three-Phase PWM Inverter for UPS Applications 不间断电源用三相PWM逆变器的数字电压和电流控制器.pdfVIP

Digital Voltage and Current Controllers for Three-Phase PWM Inverter for UPS Applications Fernando Botterón, Humberto Pinheiro, Hilton A. Gründling, José R. Pinheiro, Hélio L. Hey UFSM/CT/DELC/NUPEDEE ZIP CODE: 97105-900 – Santa Maria, RS – Brazil E-mail: botteron@nupedee.ufsm.br, humberto@ctlab.ufsm.br Abstract – This paper proposes discrete time voltage and current which is normalized to couple with limited dynamic range of controllers for three-phase PWM inverters used in UPS a fixed-point DSP implementation. Section III presents the applications. An accurate state space discrete model of the PWM inverter-filter-load, which takes into account non- LC Filter design. Section IV presents voltage and current linearities and propagation delays associated with a real time controller design. Section V proposes an anti-windup digital implementation, is derived for the controller design. The strategy, while Section VI presents experimental results from output voltages and inductors currents are dynamically limited a 15kVA inverter prototype. Finally, Section VII summarizes by means of MIMO controllers designed using optimal servo linear quadratic regulators, which ensure stability for the the main points of this paper. system at all