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Common mode current suppression is important to grid-connected photovoltaic (PV) systems and depends strongly on the value of the parasitic capacitance between the PV panel and the ground. Some papers address that the parasitic capacitance of PV panel becomes larger in the humid environment. However, they do not give detailed explanation, and some give confusing address. This paper presents clarified...
A multiterminal Energy Interconnection System Based on MMC was developed, which connected active sub-modules, DC grids and AC grids. However, the power imbalance of the active sub-modules exists in this system, for example, inconsistent maximum power points of the PV panels will lead to system power loss. In order to solve the problem, this paper first presents a power control scheme between the three-terminals,...
In this paper, a new passive islanding detection method for grid-connected photovoltaic inverters is proposed. The proposed method is based on extracting signatures from the high frequency components of voltage at the point of common coupling (PCC), which occur after an islanding condition. These high frequency components contain signature information capable of identifying the islanding condition...
A cascaded H-bridge multilevel inverter has been applied in large scale photovoltaic systems, with the features of modular, distributed maximum power point tracking control scheme and so on. However, the power of photovoltaic modules supplied to each phase of the inverter may be different, introduced by the different irradiance levels and ambient temperatures, leading to the asymmetric grid currents...
According to the problem that differential mode circulating current exists in the three-level modular grid-connected photovoltaic system with LC filter, the equivalent model of differential mode circulating current was proposed in this paper. Differential mode circulating current was divided into two types according to different loops. The admittance curve of differential mode circulating current...
Linking the capacitor neutral point of LCL filter to the DC midpoint for transformerless three-level photovoltaic inverter has an advantage of leakage current reduction. But it also brings large current virtual value and low-frequency resonance of bridge-side current, which leads to the reduction of the system efficiency and stability. Aiming at these problems, the common and differential mode model...
This paper will introduce an advanced intelligent power module (IPM) for PV-inverter application, which is newly developed by Mitsubishi Electric and called as PV-IPM. According to the simulation results, the power loss of the new PV-IPM is lower, so the PV-inverter using new PV-IPM could have high efficiency. Moreover, the integrated drive IC and protection functions make the application of new PV-IPM...
Photovoltaic energy has nowadays an increased importance in electrical power applications. However, the output power provided via the photovoltaic conversion process depends on solar irradiation and temperature. Therefore a multiple-input DC/DC converter is proposed for stand-alone photovoltaic lighting system with battery storage in this paper. Compared with the traditional stand-alone photovoltaic...
In order to study the power loss caused by the truncation error, a range of operating points is proposed, during which the misjudgments caused by the truncation error occur. The span of the range of operating points directly decides the amounts of tracking loss. From this point of view, the Perturbation and Observation (P&O) Method and Incremental Conductance (INC) Method are compared. Eventually,...
Increasing efficiency is the most critical issues for photovoltaic systems, this paper introduces the views of the energy losses to the maximum power point tracking, and analyzes the maximum power point tracking's dynamic and static energy losses detailedly.Then proved by the simulation of static and dynamic characteristics for incremental method (IncCond). The simulation and the theory proved that...
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