Abstract
The problem of developing a mathematically rigorous methods for calculating the composition of the higher harmonics is important in the electrical grids of power systems in modern conditions to increase accountability between power suppliers and its consumers. The first reason is the solution of problems of energy saving. The second reason is delineation of responsibilities to ensure the required power quality between the electricity supply company and customers.”
Highlights
The widespread use in the power conversion devices based power semiconductor materials leads to conducted disturbances in power grids, primarily the higher harmonic components of voltage and current (1-4)
On the basis of the mathematical apparatus of the local Fourier transform we receive the equivalent circuit of а three-phase manage thyristor converter, allowing use to calculate harmonic currents in the power supply system
The influence of the network on the equivalent circuit has an effect through the angle control, which depends on the voltage supply for a given average rectified current, whose value is determined by technological process and maintained by the control system unchanged
Summary
The widespread use in the power conversion devices based power semiconductor materials leads to conducted disturbances in power grids, primarily the higher harmonic components of voltage and current (1-4). Approximation methods of calculation the composition of the higher harmonics have been working successfully up till now. Approximation methods are in conflict with the requirements of detail costing of electricity transmission and financial responsibility for ensuring proper power quality between its provider and the consumer. There is extensive scientific literature of calculations of harmonic voltage and current in power systems. Calculations of higher harmonics of current and voltage in power systems almost use one method of accounting for inverter. The composition of the current harmonics thyristor converter is given as a current source in the equivalent circuits of power supply systems. The equivalent circuit as a current source with parallel conductivity given in (9) is postulated without proof and, as will be shown below, incorrect. Miscalculation of possible level of overvoltage may cause unjustified costs for their elimination
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