Design of a Measuring System for Electricity Quality Monitoring within the SMART Street Lighting Test Polygon: Pilot Study on Adaptive Current Control Strategy for Three-Phase Shunt Active Power Filters

Abstract

This study focuses on the design of a measuring system for monitoring the power quality within the SMART street lighting test polygon at university campuses with relation to testing an adaptive current control strategy for three-phase shunt active power filters. Unlike conventional street lighting, SMART elements are powered 24/7. Due to the electronic character of the power part of such mass appliances, there are increased problems with the power quality of the electric energy. Compared to the current concept of street lighting, there is a significant increase in the content of higher current harmonic components, which cause several problems in the distribution system. The test polygon contains 16 luminaires made by various manufacturers and mounted with various SMART components. Using the polygon control and monitoring system, dynamic load scenarios were selected. These scenarios tested the possibilities of different adaptive current control strategies for three-phase shunt active power filters to improve the power quality of electricity. This study focuses on three adaptive algorithms that respond to dynamic changes of current harmonics level in real-time. The possibility of active filter control was tested using FPGA, mainly due to the low latency of the filter control part.

Optimal Design and Control of MMC STATCOM for Improving Power Quality Indicators

“…where idiffj denotes the phase j inter-circulating current that circulates between the upper and lower legs and is expressed as below: As discussed in [7], the MMC operates according to the following equations:…”

“…where ej denotes the inner emf produced in phase a and is given as follows: As discussed in [7], the MMC operates according to the following equations:…”

“…Many research papers have proposed different techniques and optimization algorithms to improve power quality indicators in the presence of nonlinear and/or unbalanced loads [4]. The static synchronous compensator (STATCOM) is one of the FACTS devices that introduces an efficient and flexible solution for power quality improvement and disturbance mitigation [5][6][7]. The practical circuit of the STATCOM usually includes two-level voltage source converters (VSC), and a line-frequency transformer is adopted for the enhancement of its voltage and current ratings; however, it results in the heavy, unreliable and expensive design of the compensator [5,6].…”

Power Quality Disturbance Tracking Based on a Proprietary FPGA Sensor with GPS Synchronization

“…The results were delivered by choosing a real case study of STCOMET, a commercial electronic board widely used for remote energy metering purposes, and the paper has verified the possibility to implement PQ metrics in it. The authors of [ 18 ] designed an intelligent street lighting PQ monitoring system to test the adaptive current control strategy, in which a commercial measurement system from National Instruments (NI) cDAQ-9185 was used. As a result, they observed that the THD decreased by 19% on average.…”

The Influence of Power Network Disturbances on Short Delayed Estimation of Fundamental Frequency Based on IpDFT Method with GMSD Windows

“…Monitoring the frequency of voltage waveforms in power supply networks is one of the most important parameters from the point of view of, e.g., power quality measurements [1,2] and power network protection automation devices, especially those occurring in inverters used in the photovoltaic industry [3][4][5]. In the first industry, incorrect estimation of the fundamental frequency of the waveform results in a so-called spectrum leakage, and consequently, in an increased uncertainty of measurement of spectral parameters such as harmonics and interharmonics.…”