One phase active filter with energy storage for active power surge compensation in feed line

Abstract

Abstract:The paper presents a concept of an active filter with energy storage. This solution can be used for the compensation of momentary one phase high power loads with discontinued power consumption (e.g. spot welding machines). Apart from the typical filtering capabilities, the system's task is also the continuity of the input power from the feeder line and limiting its fluctuation. The proposed by the author's solution can produce measurable economic benefits by reducing the rated power necessary to energize periodically operating loads and improving the indicators of electrical energy quality. The developed method of active power surges compensation enables a flexible approach to requirements concerning the rated power of the point to which the periodically operating loads with high peak current value are connected. The tests were conducted on a simulation model specially developed in Matlab & Simulink environment, proving high effectiveness of the presented solution.

An Active Power Filter with Energy Storage and Double DC Conversion for Power Surge Compensation

“…The non-repeatability of the shape of the recorded welding currents (e.g., the differences between the maximum values regardless of maintaining a constant welding angle) are due to phenomena occurring between electrodes (the burning out of oxides and contamination, uneven contact pressure, etc.) [16].…”

“…A graph of the waveforms produced in the analyzed time horizon is presented in Figure 10c (zoomed-in Figure 10d). Due to the step-down transformer in the structure of the used welding machine, currents are distorted by odd harmonics (especially 3, 5, 7-core saturation effect) [16]. The operation of the filter also limits their content in the line current.…”

“…The load was turned on for 12 periods of line voltage (twice as long as assumed). During compensation of this load pulse ES capacitance CS Due to the step-down transformer in the structure of the used welding machine, currents are distorted by odd harmonics (especially 3, 5, 7-core saturation effect) [16]. The operation of the filter also limits their content in the line current.…”

“…The solution of the issue is the employment of a single-phase active power filter (APF) connected to an energy storage (ES) system whose control algorithm will enable the active power surge suppression in the feeder line (by limiting the variable power component value) [16,17]. Such a solution can produce measurable benefits by reducing the rated power necessary to feed periodically operating loads, and it improves the indicators of electrical energy quality.…”

Three-phase four-wire shunt active power filter working simultaneously as energy conditioner

“…This possibility can be implemented by introducing controlled inertia to the active filter action (Szromba, 2015). A similar problem, but using an additional DC-DC converter, is discussed by Sowa et al (2016).…”