Simulation and physical modelling of synchronous electric drive for electric and hybrid vehicles

The article presents the theoretical foundations of the device and the principle of control of a power electric drive. An overview of the main structural elements and the requirements for the electric drive are made. Power electric drive control systems using inverter converters are considered: frequency-current control based on a current inverter; frequency-current control based on a voltage inverter; direct torque control; vector field control. The main provisions of the use of simulation and physical modeling in the development of an electric drive are presented. On the basis of the previous analysis, the best solutions allowing modeling the electric drive have been selected. The choice of the element base has been substantiated and the development of a physical model has been carried out.

Analisis Arus Bocor pada Sistem PLTS Terhubung ke Jaringan Tanpa Transformator Terhadap Keselamatan Manusia

Intisari — Sistem PLTS yang terhubung ke jaringan tanpa transformator merasakan arus bocor akibat adanya kapasitansi parasitik pada panel surya yang diketanahkan dan hubungan galvanis antara sumber DC dan jaringan. Arus bocor berbahaya bagi keselamatan manusia yang menyentuh panel surya. Penelitian ini menghitung arus bocor melalui simulasi menggunakan Matlab. Rangkaian simulasi terdiri dari sumber DC PLTS, inverter satu fasa, sumber AC jaringan, filter dan kapasitansi parasitik. Kapasitansi Parasitik dimodelkan dengan sebuah kapasitor tunggal. Kondisi panel basah atau kering memberikan nilai kapasitansi yang berbeda. Hasil simulasi menunjukkan bahwa kondisi panel basah menghasilkan arus bocor sepuluh kali lebih tinggi dari kondisi panel kering. Arus bocor pada kedua kondisi masih dibawah batas maksimum standar keselamatan mengacu pada DIN VDE 0126-1-1.Kata kunci — arus bocor, PLTS, kapasitansi parasit, arus common mode, inverter.Abstract — PV system on grid transformerless experiences leakage current due to parasitic capacitance on grounded-PV panel and a galvanic connection between the grid and the dc source. Leakage current is harmful for human who touch the PV panel. This research calculates the leakage current via simulation using Matlab. Simulation circuit consists of DC source as PV system, one phase inverter, grid AC source, filter and parasitic capacitance. A single capacitor is used to model parasitic capacitance. Wet and dry condition of PV panel generate a different capacitance. The simulation results show wet PV panel produce a leakage current ten times higher than that in dry PV panel. The leakage curent either in wet and drycondition are below maximum limit of DIN VDE 0126-1-1 safety standard.Keywords— leakage current, PV system, parasitic capacitance, common mode current, inverter.

Critical frequency of autonomous current inverter when operating on active-inductive load

The article presents the results of a study of a circuit of an autonomous current inverter with shut-off valves when operating on an active-inductive load in terms of identifying its properties, energy characteristics and comparing the circuit with a traditional parallel current inverter with capacitive switching without additional valves.

An Overview of PV Technology by Analyzing Various MPPT Algorithms, Suitable Converters, Stability & Their Cost Estimation.

Recently, solar energy is growing as a power source for potential alternative to meet the global demand. Unlike other energy sources such as coal, nuclear, gas and oil, their prices are not only stable, they prevent the harmful side-effects on the environment, being one of the best sources of clean energy (solar energy). This article presents an analysis of the transformation of the static system for the treatment of solar energy using photovoltaic modules. It is designed to generate energy for future generations to be more useful from different parts of the photovoltaic energy conversion system, such as a DC-DC converter, current inverter, maximum power tracking algorithm (MPPT), filter, the stability of a system, etc. The above result will be useful in the improvement of efficiency in photovoltaics structures.