Abstract
In the structural-algorithmic synthesis (SAS) of voltage source inverter (VSI) in this area of application is primarily determined by three factors: (1) increased value of output power level (1 MVA or more) that are beyond the capabilities of modern element base; (2) small distortion level of output voltage (with distortion no more than 5%); and (3) characteristics of primary power source, which is a solar modules (SM) characterized by one-sided conductivity. Structurally the SM is a set of the solar panels (SPs), which included photovoltaic cells. In SM, the solar panels (SPs) connected in parallel-series, which in turn are connected in the same way to increase the required power of the SM. To solve this problem in the paper consider the possibility as the SAS of using the principle of multi-channel conversion (MCC) of the energy flow. At that each of the M channels uses single-phase voltage source inverter (SPVSI) with pulse-amplitude modulation (PAM) of the output voltage. Today they are often referred to as multilevel SPVSI. When all channels are fed from a common power supply source, the outputs of the M channels are connected in parallel through transfilters, which sum up the currents of the channels and partially perform the function of voltage filtering. This concept is characterized by significantly smaller difference in neighboring quantization levels both in the output voltages of SPVSIs and the resulting output voltage of SPVSI with MCC. As a result electromagnetic compatibility is better here than SPVSI with pulse width modulation (PWM). Feature of a PAM in these solutions is the use of voltage levels (steps) optimized for minimum THD of output voltage and as well as modified solutions of transfilters. This reduces the installed capacity of the equipments. The results and recommendations obtained in the basis of computer simulation are presented for their comparative assessment and design.
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