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Digital isolators are widely used in isolated power converters for transmitting high-frequency gating pulses. Opto-isolators generally suffer from low reliability, while emerging RF based isolators are expensive and power-hungry. In this work, two Phase-Locked-Loop (PLL) based synchronization schemes are introduced and demonstrated to operate a bidirectional Dual-Active-Bridge (DAB) dc-dc converter...
The distributed inverters are generally integrated into power grid without switching sequence coordinated control capability since they are equipped with their own micro controllers to command the output quantities. The switching ripples of all distributed inverters will then be randomly accumulated at the point of common coupling. The recently proposed global synchronous pulsewidth modulation (GSPWM)...
In the bidirectional wireless power transfer (WPT) system, each power circuit of the transmitter and the receiver part is controlled by different controllers. Therefore, to control and maintain the entire system, the output voltage phase synchronization and data transmission functions between the controllers should be implemented. The communication circuit is normally used to realize them, but this...
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...
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...
In this paper, control of a grid-tied converter as a voltage controlled converter is investigated for distribution level grids. Small signal model of the converter is presented and a control structure is designed to deliver desired active and reactive power. This controller is using power flow equations to control the converter as a synchronous machine and without the need for a dedicated synchronization...
This paper presents a real-time integrated model of a micro-grid to simulate its electrical energy infrastructure. This infrastructure includes two PV arrays, a fuel cell, and a diesel generator that support building loads when islanded from the utility grid. The paper reviews existing models, which are usually available either as 1) low-level dynamic models, along with power electronics for specific...
This paper describes a novel concept of PWM phase and frequency synchronization. This approach applies for digitally controlled switched mode power supplies (SMPS) which need to regulate the switching frequency externally. One of the well-known advantages of having a system with a controllable switching behavior is the mitigation of the Electromagnetic Interference (EMI), which leads to the system...
Grid synchronization has always been an important challenge for three-phase grid-connected converters under unbalanced and distorted grid conditions. Moreover, how to quickly and accurately extract multiple harmonic sequence information is essential for control systems. In this paper, a three-phase multiple harmonic sequence detection method is proposed for estimating both the fundamental and harmonic...
In this paper, the performance of different interleaving control methods for gallium-nitride (GaN) devices based MHz critical conduction mode (CRM) totem-pole power factor correction (PFC) circuit is compared. Both closed-loop interleaving and open-loop interleaving are good for low frequency CRM PFC; but for MHz very high frequency CRM PFC with microcontroller (MCU) implementation, open-loop interleaving...
A complete control system of smart microgrid is proposed in this paper, in order to realize the smooth mode transfer of the grid-connected mode (GTM) and islanding mode (ILM). In the system, every DG unit will work as the voltage source and use the same control method of output voltage, whatever in GTM or ILM. The only difference of GTM and ILM is how to regulate of the reference voltage of the voltage...
This paper proposes synchronization strategies for cascaded H-Bridge multi level inverter (CHBMLI) topologies with carrier based sinusoidal pulse width modulation (PWM) techniques. It is presented how synchronous carriers are generated in desired phase and frequency from the instantaneous voltage references to maintain 3-Φ, half wave and quarter wave symmetries among inverter pole voltage outputs...
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