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Aiming at that it is difficult to choose the value of virtual damping(VD) in passivity-based controller of the Boost converter, this paper proposes an approach which can be used to calculate and optimize the value of VD. The range of VD can be determined by constraining overshoot of the current response of Boost converter. The optimal VD can be found in the range of VD by genetic algorithm(GA) and...
Vector control is the most commonly used control strategy for modular multilevel converter (MMC) based HVDC system. However, due to the complicated structure of MMC, there is no precise mathematical model for the outer DC voltage loop. The conventional model ignores the capacitor voltage dynamics, and the AC voltage boosted operation scenario is not considered. This paper proposes a small signal model...
An open-loop and closed-loop operating boost-power-stage converter with relatively low damping factor exhibit resonant behavior in transient conditions. Such an undamped transient characteristic introduces overshoot to the control-to-output-variable transfer function, which is also visible in the inductor current transient behavior. Therefore, due to the either too large duty ratio or voltage-reference...
Input current of a Current Fed Switched Inverter (CFSI) contains the switching frequency component (75 kHz) and a second harmonic component of line frequency (100 Hz) apart from the DC part. In prior designs, the second harmonic component was suppressed by increasing the size of passive components (inductor or capacitor), which makes the inverter implementation bulky. This paper presents a control...
Photovoltaic panel characterisation finds extensive use in output prediction, efficiency estimation and defect detection in photovoltaic (PV) industry. Out of the various characterisation methods available, the use of switched mode power converters is one of the most attractive solutions, owing to high speed, low power loss and additional maximum power point tracking ability. Duty ratio variation...
Buck and buck-boost ac-ac converter topologies with a center-point-clamped circuit configuration have been recently reported in literature. These converter circuits reduce the voltage stress on the bidirectional switches employed in corresponding direct ac-ac converters. This new topological structure enables access to the mid-point of voltage terminals. This paper introduces a family of such ac-ac...
Among various converters, the LLC electric current resonant converter attracts attention because of high power density, low noise and high efficiency. However, this converter cannot apply the analysis of averaging method, and impossible to derivate the transfer function, so designing is difficult. In this study, we devised a method to derive a frequency response characteristic with a transfer function...
One of the most important goals for this study is to reveal an effective way to develop systematically the state equations that define the analog circuits (linear, non-linear, timeinvariant etc.) with excess elements. These equations can be depicted in various forms, like symbolic form, numeric-symbolic form, numeric-normal form. At the beginning, we designed the calculation method and afterwards...
This paper proposes modeling and control system design for PV based Quasi-Z-Source Inverter (QZSI) for grid connected applications. The control system is designed based on the dynamical characteristics of the converter and introduces two cascaded controllers. Firstly, output current controller designed in the stationary frame. The second is DC-link voltage controller. Also, Modified Direct Incremental...
We propose a novel class-AB second-generation Current Conveyor (CCII) based on the class-AB Flipped Voltage Follower (FVF) topology, and compare it with a class-A CCII based on the conventional FVF. The AB-FVF is capable of driving larger capacitive loads, showing faster settling. Furthermore, it can drive the Z output with currents larger than the biasing ones, improving power efficiency. A modification...
Using current conveyors, we present six different current-mode circuits approximating fractional-order low-pass transfer function. Proposed circuits always use four active elements, three capacitors and seven or five resistors, whereas all are grounded. We show that the usage of only eight passive elements is sufficient to approximate a (1 + α)-order system (0 < α < 1) and can even provide better...
Available fractional-order PIλDμ controllers introduced in the literature use discrete component realizations, where the approximations of fractional-order integration and differentiation operations is performed using appropriately configured RC networks. A novel re-configurable fractional-order PIλ controller, suitable for brake and throttle control in an autonomous vehicle, is presented in this...
This paper presents the circuit simulator for noise analysis of switched-capacitor (SC) circuits using adjoint network approach in python environment. Adjoint network approach is a simpler method for noise calculations in SC circuits because just solving of the adjoint network gives the node voltages which are transfer functions (output is injected with unit current source in this approach) these...
Pseudo-differential circuits approximate the performance of fully-differential structures, while allowing single-ended operation of the two half stages in the circuit. This requires duplication of the circuitry, with accurate symmetry needed between the two halves to cancel common-mode noise. This paper proposes a single-ended scheme which uses double sampling and time interleaving to achieve a performance...
Output characteristics of phase module combined three-phase single-stage PFC converter based on full-bridge structure are analyzed in detail. The module combined three-phase single-stage PFC converter is the combination of three single phase full-bridge PFC converters, whose topology and operation principle are presented. Two times line frequency output voltage ripple under balanced and unbalanced...
To improve the dynamic performance and the anti-disturbance capability of the photovoltaic energy storage system, a control strategy of the bidirectional DC-DC converter based on Linear Active Disturbance Rejection Control (LADRC) is proposed in this paper. Firstly, the mathematical model of the bidirectional DC-DC converter is established. And then, the double closed-loop control strategy based on...
This paper introduces a speed-enhanced incremental ADC architecture for high-resolution low-power sensor applications, incorporating a third-order sturdy MASH modulator. Unlike previous sturdy MASH ADCs, owing to the properly modified loop filters in the 2-1 sturdy MASH, the quantization noise of the first noise-shaping loop could be cancelled out. The proposed ADC with a 4b coarse SAR ADC and a 2-1...
Dual active bridge (DAB) with input-series output-parallel (ISOP) structure is capable to interconnect low voltage DC micro grid with medium/high voltage DC distribution grid, named as DC solid state transformer (DCSST). This paper presents a combined decoupling control strategy for the DCSST, which aims to achieve input voltage sharing among sub-modules and enhance voltage control of the parallel...
In this paper, an output current differential control method is presented for an input series output parallel (ISOP) system. The method includes a specialized output current sharing loop to achieve power equilibrium in modules, and avoids steady- state sharing errors due to parameters mismatch. However, in the transient process, inconsistent parameters can produce individual input voltage and output...
This paper presents design and analysis of a charge-pump based high-gain boost converter. The converter exhibits higher voltage gain, almost double, in comparison to the well-established conventional boost converter. Additionally, to reduce the source current ripple an interleaved gating scheme is employed for the active switches. A steady-state analysis is made, and then design expressions for converter...
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