Browsing by Author "Jung, SL"

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A three-phase PWM AC-DC converter with low switching frequency and high power factor using DSP-based repetitive control technique
(1998)
Jung, SL
;
Huang, HS
;
Tzou, YY
;
電控工程研究所
;
Institute of Electrical and Control Engineering
This paper presents a novel digital control scheme for PWM AC-DC converters with low switching frequency used in high-power applications. The proposed scheme incorporates an inner current loop with an outer voltage loop to improve input power factor and regulate the output de-link voltage. The inner current loop consists of a predictive controller and a repetitive controller. The outer voltage loop is composed of a digital IPI controller and a load current compensator. A PWM AC-DC converter employing DSP control has been constructed to verify the proposed control scheme. A nearly unit input power factor can be achieved even with a low switching frequency. Experimental results confirm the feasibility and features of the proposed repetitive control scheme for unit power factor regulation.
Adaptive repetitive control of PWM inverters for very low THD ac-voltage regulation with unknown loads
(1999-09-01)
Tzou, YY
;
Jung, SL
;
Yeh, HC
;
電控工程研究所
;
Institute of Electrical and Control Engineering
An adaptive repetitive control scheme is proposed and applied to the control of a pulsewidth-modulated (PWM) inverter used in a high-performance ac power supply; The proposed control scheme can adaptively eliminate periodic distortions caused by unknown periodic load disturbances in an ac power supply, The proposed adaptive repetitive controller consists of a voltage regulator using state feedback control, a repetitive controller with tuning parameters, and an adaptive controller,vith a recursive least-squares estimator (LSE), This adaptive repetitive controller designed for ac-voltage regulation has been realized using a single-chip digital signal processor (DSP) TMS320C14 from Texas Instruments, Experimental verification has been carried out on a 2-kVA PWM inverter. Simulation and experimental results show that the DSP-based adaptive repetitive controller can achieve both good dynamic response and low total harmonic distortion (THD) under large-load disturbances and uncertainties.
Design and implementation of a real-time lossless dynamic electronic load simulator
(1997)
Chang, MY
;
Lin, JY
;
Jung, SL
;
Tzou, YY
;
交大名義發表
In this paper, the construction of a new power electronics instrument, dynamic electronic load simulator (DELS), is presented. A high-performance full-bridge power amplifier with two-stage output filter and 50 kHz snitching frequency is designed for high bandwidth current loop requirement. The control of the proposed DELS mainly consists of an inner current controller and an outer load-model controller (LMC). Through the simulation and experiments, it is verified that the proposed DELS can replace a heap of RLC power components, exhibit the load behavior approximately and save a large amount of energy during burn-in test.
Design and implementation of an FPGA-based control IC for AC-voltage regulation
(1999-05-01)
Jung, SL
;
Chang, MY
;
Jyang, JY
;
Yeh, LC
;
Tzou, YY
This paper presents a field-programmable gate array (FPGA)-based control integrated circuit (TC) for controlling the pulsewidth modulation (PWM) inverters used in power-conditioning systems for ac-voltage regulation, We also propose a multiple-loop control scheme for this PWM inverter control IC to achieve sinusoidal voltage regulation under large load variations. The control scheme is simple in architecture and thus facilitates realization of the proposed digital controller for the PWM inverter using the FPGA-based circuit design approach. Bit-length effect of the digital PWM inverter controller has also been examined in this paper. The designed PWM inverter control IC has been realized using a single FPGA XC4005 from Xilinx, Inc., which can be used as a coprocessor with a general-purpose microprocessor in application of ac-voltage regulation. Owing to the high-speed nature of FPGA, the sampling frequency of the constructed IC can be raised up to the range that cannot be reached using a conventional digital controller based merely on microcontrollers or a digital signal processor (DSP), Experimental results show the designed PWM inverter control IC using the proposed control scheme can achieve good voltage regulation against large load variations.
Design and implementation of an FPGA-based control IC for the single-phase PWM inverter used in an UPS
(1997)
Jung, SL
;
Chang, MY
;
Jyang, JY
;
Huang, HS
;
Yeh, LC
This paper presents an FPGA-based multiple-loop control scheme for the regulation of the PWM inverters used in UPS. The proposed control scheme incorporates an inner current loop with an outer voltage loop to regulate the output voltage of the PWM inverter, which is expected to be sinusoidal. The corresponding control gains are designed through deadbeat theory so that the inverter can achieve fast dynamic response. An output voltage decoupling mechanism and a load disturbance compensation scheme have been proposed to improve the stiffness of the controlled PWM inverter. The developed digital controller has been realized by a RAM-based FPGA XC4010 to verify its effectiveness. The simulation and experimental results show that the output voltage of the controlled PWM inverter has good transient response and little distortion under rough load conditions.
Discrete sliding-mode control of a PWM inverter for sinusoidal output waveform synthesis with optimal sliding curve
(1996-07-01)
Jung, SL
;
Tzou, YY
;
交大名義發表
;
電控工程研究所
;
National Chiao Tung University
This paper presents a discrete sliding-mode control scheme with feedforward compensation for the closed-loop regulation of the pulse-width modulated (PWM) inverter used in an uninterruptible power supply (UPS), The proposed feedforward controller can effectively improve the tracking performance of the PWM inverter, In designing the sliding-mode controller, we have taken Load disturbance into consideration to enhance the robustness of the PWM inverter, Moreover, the upper bound of the load disturbance under which the sliding condition can be maintained has also been derived, The sliding curve of the sliding-mode controller is designed such that the behavior of the controlled PWM inverter is optimal subject to the selected cost function, Due to the coordinate transformation proposed in this paper, only the output voltage needs to be measured as feedback for the purpose of closed-loop regulation, Simulation and experimental results are given to show the effectiveness of the proposed control scheme.
DSP-based multiple-loop control strategy for single-phase inverters used in AC power sources
(1997)
Jung, SL
;
Huang, HS
;
Chang, MY
;
Tzou, YY
;
交大名義發表
This paper presents a fully digital multiple-loop control scheme for the regulation of the PWM inverters used in AC power sources. The proposed digital control scheme incorporates an inner current loop with an outer voltage loop to regulate the output voltage of the PWM inverter. The digital controller is designed through deadbeat theory so that the inverter can achieve fast dynamic response. To enhance the robustness of the PWM inverter concerned, an output voltage decoupling mechanism Is added to improve the performance of the inner current loop. Besides, a load disturbance compensation scheme Is also developed to remedy voltage distortion caused by load variation. Both the frequency domain end time-dom in behavior of the proposed control scheme have been examined in this paper. A PWM inverter control system based on DSP TMS320C14 was constructed to verify the control law. The results show that the output voltage of the controlled PWM inverter has little even under rough load conditions.
Full control of a PWM DC-AC converter for AC voltage regulation
(1998-10-01)
Tzou, YY
;
Jung, SL
;
電機工程學系
;
Department of Electrical and Computer Engineering
The design and implement action of a DSP-based fully digital-controlled single-phase pulsewidth modulated (PWM) dc-ac converter for ac voltage regulation is described. The proposed multiloop digital controller (MDC) consists of a current controller, a voltage controller, and a feedforward controller. This MDC was realized using a single-chip digital signal processor (DSP), The PWM gating signals are determined at Every sampling instant by the proposed multiloop digital control scheme using a set of detected feedback signals. A software current control scheme has been developed to achieve fast current control of the PWM inverter and decouple the inductor of the output filter Experimental results have been given to verify the proposed digital control scheme. The constructed DSP-based PWM dc-ac converter system can achieve fast dynamic response and with low total harmonic distortion (THD) for rectifier type of loads.
Full control of a PWM DC-AC converter for AC voltage regulation
(1998-10-01)
Tzou, YY
;
Jung, SL
;
電機資訊學士班
;
Undergraduate Honors Program of Electrical Engineering and Computer Science
The design and implement action of a DSP-based fully digital-controlled single-phase pulsewidth modulated (PWM) dc-ac converter for ac voltage regulation is described. The proposed multiloop digital controller (MDC) consists of a current controller, a voltage controller, and a feedforward controller. This MDC was realized using a single-chip digital signal processor (DSP), The PWM gating signals are determined at Every sampling instant by the proposed multiloop digital control scheme using a set of detected feedback signals. A software current control scheme has been developed to achieve fast current control of the PWM inverter and decouple the inductor of the output filter Experimental results have been given to verify the proposed digital control scheme. The constructed DSP-based PWM dc-ac converter system can achieve fast dynamic response and with low total harmonic distortion (THD) for rectifier type of loads.
High-performance programmable AC power source with low harmonic distortion using DSP-based repetitive control technique
(1997-07-01)
Tzou, YY
;
Ou, RS
;
Jung, SL
;
Chang, MY
;
交大名義發表
This paper proposes a new control scheme based on a two-layer control structure to improve both the transient and steady-state responses of a closed-loop regulated pulse-width-modulated (PWM) inverter for high-quality sinusoidal ac voltage regulation. The proposed two-layer controller consists of a tracking controller and a repetitive controller. Pole assignment with state feedback has been employed in designing the tracking controller for transient response improvement, and a repetitive control scheme was developed in synthesizing the repetitive controller for steady-state response improvement. Design procedure is given for synthesizing the repetitive controller for PWM inverters to minimize periodic errors induced by rectifier-type nonlinear loads. The proposed control scheme has been realized using a single-chip digital signal processor (DSP) TMS320C14 from Texas Instruments. A 2-kVA PWM inverter has been constructed to verify the proposed control scheme. Total harmonic distortion (THD) below 1.4% for a 60-Hz output voltage under a bridge-rectifier RC load with a current crest factor of 3 has been obtained. Simulation and experimental results show that the DSP-based fully digital-controlled PWM inverter can achieve both good dynamic response and low harmonics distortion.
Self-tuning discrete sliding mode control of a closed-loop regulated PWM inverter with optimal sliding surface
(1996)
Jung, SL
;
Huang, HS
;
Tzou, YY
;
電控工程研究所
;
Institute of Electrical and Control Engineering