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As the transformerless solar inverters have been pushed to an impressive 99% efficiency in residential and small commercial applications (less than 20 kW), high efficiency medium and large commercial scale (50–250 kW) transformerless solar inverters are gaining more and more attentions. However, due to the differences of inverter power ratings, grid voltages and standard requirements, there are new...
In case of the grid connected transformerless photovoltaic (PV) inverter, the leakage current through the parasitic capacitance of the PV panel can cause very serious electromagnetic interference problems. In this paper, a more accurate high frequency PV array model is proposed. It includes the influence of PV frame, mounting rack, solar cell material and area. Based upon that model, the common mode...
In a transformer-less photovoltaic (PV) grid-connected system, there exists a galvanic connection between the grid and the PV array. Without any transformer in the inverter, common-mode leakage currents can flow through the stray capacitance between the PV array and the ground. This paper first analyzes the equivalent common-mode circuit of single-phase inverter, and compares several single-phase...
This paper investigates power control to regulate both inputs of dual-input DC/AC inverter independently. The dual-input DC/AC inverter topologies can be either neutral point clamp (NPC) or T-type three-level inverter. A mathematical model is established to derive the relationship between the dual-input power and the duty cycle of the DC/AC inverter. Then a control scheme is proposed to decouple the...
A sampling switch with an embedded Digital-to-Skew Converter (DSC) is presented in this paper. The proposed switch eliminates time-interleaved ADCs' skews by adjusting the boosted voltage. A similar bridged capacitors' charge sharing structure is used to minimize the area. The circuit is fabricated in a 0.18µm CMOS process and achieves sub-1ps resolution and 200ps timing range at a rate of 100MS/s...
This paper presents a multi-string three-phase photovoltaic(PV) grid-connected inverter using a novel alternate single-phase current hysteresis PWM control method. In the multi-string PV grid-connected inverter, the maximum power point tracking(MPPT) of each PV array is independent, which leads to higher energy conversion efficiency. In the alternate single-phase PWM method, one line frequency cycle...
A grid-connected inverter consisted of two boost converters is proposed for single-phase grid-connected photovoltaic systems. The double loop control structure included outer current loop and inner voltage loop is designed for the system. The phase error between grid-connected current and grid voltage is computed when the negative zero-crossing of grid voltage is detected, and the phase adjustment...
A wideband compact balun for P-band dual-line polarization antenna system applications is provided, where the center frequency is 400 MHz with a 200 MHz of bandwidth (50% from 300MHz to 500MHz), and the size is smaller than 400mm×420mm. It is important to feed by balance balun to realize perfect cross-polarization level of antenna array. One of the most excellent achievements is to develop an integrated...
A system scheme of the stand-alone photovoltaic inverter based on parallel charge topology for the purpose of improving the energy conversion efficiency and optimizing the battery management was introduced. A novel circuit topology of the DC-AC inverter with the soft switching property using IGBTs and MOSFETs was presented. A modified P&O algorithm for better tracking performance with adaptive...
Emerging non-volatile memory (NVM) technologies are getting mature in recent years. These emerging NVM technologies have demonstrated great potentials for the universal memory hierarchy design. Among all the technology candidates, resistive random-access memory (RRAM) is considered to be the most promising as it operates faster than phase-change memory (PCRAM), and it has simpler and smaller cell...
Photovoltaic (PV) generation system is an intermittent power source in traditional power grid. With its capacity expanding, PV power station (PS) affects the power grid more and more obviously. In this paper, stochastic chance-constrained programming of large-scale (LS) grid-connected (GC) PVPS's capacity limit is studied in detail. The problem is represented as a planning model which maximizes total...
Based on the theory of controlled source and on the assumption that the input/output variables of all AC devices in the PV station are pure sine functions, a method to simulate the operation characteristics of PV station's power conversion and transmission system is proposed. Phasor analysis and controllable power source theory are applied in the proposed method for the first time. Then a whole mathematic...
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