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This paper proposes a capacitance estimation method of the supercapacitor bank in the supercapacitor energy storage system (SCESS). To diagnose a deterioration, the capacitance of the supercapacitor bank is estimated by using a current injection. The injected current causes an AC ripple voltage and AC ripple current in the supercapacitor bank, which are extracted by using the proposed signal processing...
Control scheme for TRIAC dimming high PF single-stage LED driver with adaptive bleeder circuit and nonlinear current reference is studied in this paper. The target of the control scheme is to achieve high efficiency and high compatibility to different kinds of TRIAC dimmers. The control scheme includes adaptive bleeder circuit control, operation modes control, non-linear current reference and output...
The use of a digital architecture in PWM controllers for point-of-load (POL) applications, together with system identification techniques, allows the development of fully automated routines for in-situ system performance optimization where controller parameters are specifically tailored to the application. In this context, this paper proposes a method for performing parametric system identification...
This study presents a comparison of several methods to improve state-of-charge (SOC) estimation performance using the extended Kalman Filter (EKF) algorithm for a commercial a lithium iron phosphate (LiFePO4) cell. Firstly, this work attempts to show the comparison of SOC performance according to the number of RC-ladder. Secondly, this work shows a comparison of SOC estimation with and without minor...
It is very important to estimate flux accurately in implementing high-performance control of AC motors. Theoretical analysis has been made to illustrate the performance of the pure-integration-based and the Low-Pass Filter (LPF) based flux estimators. A novel flux estimator based on Second-Order General Integrator (SOGI) with Frequency Locked-Loop (FLL) is investigated in this paper for induction...
The Second-Order Generalized Integrator (SOGI) was used as a building block for the SOGI-Quadrature-Signal Generator (SOGI-QSG) which has been widely used for grid synchronization, frequency estimation, and harmonic extraction over the past decade. This paper further investigates its integration and differentiation characteristics, with four new integrators and differentiators proposed. Theoretical...
This paper proposes a multilevel shunt active power filter (SAPF) to deal with either harmonic currents compensation or reactive power compensation. Such a device can reduce the harmonic distortion at the grid currents provided by non-linear loads located in stiff systems. The proposed SAPF is based on three-phase bridge (TPB) converters connected to cascaded single-phase transformers. The transformers...
This paper proposes a sensorless control method for Wound-Rotor Synchronous Starter/Generator (WSSG) in starting process. It is necessary to identify the initial rotor position when uses sensorless control method to start-up AC machines. However, during the process of initial orientation the excitation current of the main generator contains severe pulsating components, which leads to the ineffectiveness...
This paper proposes a novel method for magnetic polarity detection in pulsating current injection based self-sensing control of surface-mounted permanent-magnet synchronous motors (SPMSM). When a proper high frequency current is superimposed in d-axis, the flux linkage saturates which can lead to the distortion of the resulting voltage. With the Fourier analysis, the 2nd harmonic of the resulting...
The safe and continuous operation of the power switches of the inverter units is vital in assisting the functioning of the inverter units. This paper proposes an algorithm for the condition monitoring and prognosis of wire-bond fault in an IGBT- extensively used power switch in inverter systems. The proposed algorithm employs both on-state collector emitter voltage and collector current in the estimation...
Ultracapacitors (UCs) are the significant component of the energy storage systems (ESS) in the electric traction applications. In the field of electric transportation the UCs need to be modeled dynamically in order to capture real-time characteristics. The model should provide precise estimation of UC responses to various charge/discharge conditions and also predict the behavior of UCs under varied...
High precision state of charge (SOC) estimation in battery packs is an integral and important part of battery management and maintenance in various applications ranging from smart grid battery energy storage systems to Electric and Hybrid Electric Vehicles (EV/HEV). In practice, measuring voltage of battery cells in a noisy environment will lead to erroneous SOC estimation, thus compromising the management...
For a Li-ion battery based energy storage system, the state of energy is a key index for the energy management and operation optimization. In the actual Li-ion batteries based energy storage system in building environment, the varying load current will lead to the estimated battery's residual energy deviated from the real value. To solve this problem, an equivalent circuit model is presented for the...
Synchronization is a crucial aspect in grid-tied systems, including single-phase photovoltaic inverters, and it can affect the overall performance of the system. Among prior-art synchronization schemes, the Multi Harmonic Decoupling Cell Phase-Locked Loop (MHDC-PLL) presents a fast response under grid disturbances and high accuracy under harmonic distortions. However, major drawbacks of the MHDC-PLL...
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