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Communication latency which inherently occurs in wide area measurement system greatly degrades small-signal stability (SSS) and is stochastic in nature, and thus, the current power oscillation damping controllers (PODCs) designed to improve SSS must consider this crucial factor. This paper proposes a probabilistic method to tune the parameters of PODCs incorporated in renewable farms to improve SSS...
The output power of a magnetic resonant coupling wireless power transfer (WPT) system drastically decreases when the distance of couplings coils changes due to impedance mismatch. A maximum power point occurs at only one optimal distance. These characteristics are caused by limitation in design stage. This paper proposes a new impedance tuning method of tracking, for maximum power point, by adjusting...
This paper presents a model predictive current control method for a class E resonant inverter for piezoelectric ceramic transducer (PCTs) applications. The capacitor voltage is used to predict a future value of the load current of the PCT. The class E resonant inverter is operated at the suboptimal mode to minimize switching losses of the power switch. Power switches operate under zero voltage switching...
This paper presents a model predictive control of a resonant inverter with LLC load configuration. The targeted application is an induction furnace. The proposed control requires neither phase-locked loop control nor PI tuning since the LLC load model is used to predict future current values for the load. An objective function is formulated such that a proper operating frequency reflecting the targeted...
Piezoelectric ceramic transducers (PCTs) are used as the vibration sources for the ultrasonic cleaner. However, PCTs have a narrow operational region and sensitive to load variation. This paper presents the operational region of a class E resonant inverter for extending the PCT operational range. The class E resonant inverter is operated at the suboptimum mode to minimize switching losses of the power...
This paper presents a study on a proton exchange membrane fuel cell (PEMFC) emulator based on dynamic model with relative humidity calculation. The dc/dc converter is controlled by using the PEMFC mathematic model to emulate the behavior of PEMFC. The dynamic models of PEMFC have been applied in the controller as well as the calculation of the relative humidity in order to choose the correct state...
Distance and frequency variation are the main causes for dramatic decrease of the output power and efficiency in wireless power transfer system. The influence of these parameters should be considered from the design stage. This paper investigates the effect of distance and proposes a method to estimate the distance with maximum output power for air-core coils. The effect of operating frequency focused...
Nowadays, transformerless photovoltaic (PV) inverter systems are becoming to be used widely to achieve high efficiency, and the research level of PV systems is widespread continuously. However, main problems of PV inverter systems are the leakage currents, electromagnetic emissions, and losses in system. This paper introduces the buck-boost-based three-switch three-state Z-source inverter for using...
This paper presents an improved power control of resonant inverter with the LLC topology using model predictive control. The targeted application is an induction furnace. The PI parameter tuning step is eliminated since an LLC resonant model is used to predict a future value of the inverter current. The output voltage can be predicted by all possible switch states of a full bridge LLC resonant inverter...
This paper investigates the impact of solar photovoltaic generation in small signal stability in a two area system at different penetration levels. The tested system also consists of the Flexible AC Transmission system (FACTS) device. This paper uses the Static Var Compensator (SVC) and Thyristor Controlled Series Capacitor (TCSC). The analysis can be categorized into three cases. The first case is...
This paper proposes the combining of μ-synthesis robust repetitive control and feedforward control scheme to the design of constant sinusoidal voltage tracking for a stand-alone three-phase constant voltage inverter. The controller designed problem is defined in the form of two-degree-of-freedom feedback-feedforward controller. The D-K iterative algorithm is used to solve for both parts of the controller...
This paper presents the method to estimate load value and output voltage of the inductive power transfer (IPT) system with series-parallel (SP) compensation topology. This technique uses primary side measured variables without the need of secondary side measurement and communication devices between the circuits. In addition, the magnitude of the output voltage has been controlled by using only a single-side...
This paper proposes a power control of LLC resonant inverter for an induction furnace using asymmetrical duty cycle control (ADC) with phase limit to guarantee zero voltage switching (ZVS) operation and protect switching devices from spike current during the operation. The output power can be simply controlled through duty cycle of gate signals of a full-bridge inverter. With the phase limit control,...
This paper presents a variable-frequency asymmetrical voltage-cancellation (AVC) control technique for inductive power transfer system. The commonly used series-series compensation topology is focused. The principle of the proposed method is to avoid unintentionally hard switching operation suffered in traditional fixed frequency AVC control when operated under low output power. With the inclusion...
This paper presents a technique to control the output voltage of series-parallel (SP) topology inductive power transfer (IPT) system by using only a primary side controller which reduces cost, size, complexity and loss compared to the conventional IPT dual-side controller. The duty cycle of the inverter output voltage is controlled by a controller located in the primary side which keeps the DC output...
This paper presents a comparison of two control strategies between the fixed-frequency method and the variable-frequency method for output power control of a full-bridge resonant inverter in domestic induction cooking to address an issue of the distorted load current due to low-quality-factor load. The control strategies are based on the asymmetrical control using positive half-cycle control while...
Inductive power transfer systems use the principle of magnetic coupling to transfer power through the air gap. The resonant inverter is use to produce magnetic flux by generating high frequency current transmitting through the power pad. The basic topologies give the large inverter current with the large conduction loss. This paper proposed the LCL resonant voltage source inverter in order to reduce...
This paper presents a high efficiency LCCL series resonant inverter for ultrasonic dispersion system with resonant frequency tracking and asymmetrical voltage cancellation control. With the proposed control, the operating frequency of the inverter is automatically adjusted to track the resonant frequency under load parameter variation due to surrounding condition. The zero-voltage switching (ZVS)...
This paper summarizes the progress of Automatic Meter Reading (AMR) system of Provincial Electricity Authority (PEA) Thailand. This paper provides information such as: the automatic meter reading system structure, AMR project information, number of smart meters deployed, benefits and obstacles. Emphasis is given to the successes and problems faced dokuring the implementation. This study is aimed at...
This paper presents a three-phase output power control scheme of an induction heating (IH) system using an automatic variable-frequency symmetrical voltage-cancellation (AVFSVC) control technique. The power control is based on the instantaneous output power, filtered and compared with a reference value. The phase angle a is automatically varied depending on the power requirements where the low-power...
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