Compensation of higher current harmonics at harmonic distortions of mains supply voltage

Improvement of compensation method for non-active current components at mains supply voltage unbalance

“…It can be explained by the fact that interpretation of power components according to the IP p-q theory as well as other theories, does not answer the question what nonsinusoidality or unbalance is caused by: the load or the mains [11,14,15]. The above said explains the urgent interest of contemporary scientists [9,12,14] in the problem of research in the frequency-domain and the time-domain of compensation processes in power supply systems to improve the method of compensation for current non-active components when the supply mains voltages are asymmetric [11,14,15].…”

“…9, 10), where operation of the known compensator is demonstrated, significant harmonic distortion of voltage and current signal form was observed [14,15]. They were assessed by the coefficient of total harmonic distortions of voltages THD U and currents THD I [23].…”

“…It should be mentioned that the analysis of the obtained expressions for compensation for non-active components of current in the frequency-domain demonstrated that the APF correct operation is possible without taking into account asymmetrical components of supply voltage and harmonic distortions [14,15], caused by load impact on current signals curves. It means that independently of the cause of current unbalance: load or supply mains, the use of harmonic components of voltage, without taking into account their asymmetric components, in generation of compensation currents will enable high-quality compensation.…”

“…7). It consists of linear active-inductive load, active-inductive resistances of the mains, current and voltage measuring blocks, a compensator, a CS compensator, a voltage signal balancing block (VSBB), and also a separation block (SB) [14,15]. For performance of preliminary research during mathematical modeling APF was represented as a controlled current source.…”

“…It allows one to properly research both simple nonlinear electric circuits [18][19][20], and more complicated electrotechnical complexes [21] and power supply systems [14,15].…”