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Abstract
An electric spring (ES) with series connection to non-critical loads (NCLs) is mainly known as a smart load (SL) technology that can compensate undervoltages and overvoltages. In this paper, an improved control method is presented for the electric spring to regulate the effective value of the critical load (CL) voltage to the nominal value and to compensate the harmonics of the critical load voltage caused by the grid side. The electric spring’s performance for simultaneous voltage magnitude regulation and harmonic distortion compensation is investigated through simulation studies. The results are compared with those of a conventional control scheme. It has been demonstrated that the electric spring, using the improved control system, reduces the amplitude deviation and distortion of critical load voltage.
Highlights
Renewable energy sources (RESs) such as wind and solar are expected to replace the traditional fossil fuel sources, to create an environment with less carbon pollution [1].The emergence of electric vehicles (EVs) is another example that can be effective in reducing pollution [2]
The electric spring has been presented as a demand-side technology to regulate the voltage of critical loads, especially in networks with significant penetration of renewable energy sources
Several control systems have been proposed for this technology to regulate the voltage through reactive power compensation
Summary
The emergence of electric vehicles (EVs) is another example that can be effective in reducing pollution [2]. The use of these devices in the grid, due to their oscillating nature, and the use of power electronic devices in them, causes power quality problems such as voltage fluctuations and harmonics in the electrical network [3]. Various power electronicbased devices have been utilized for voltage amplitude compensation (e.g., static VAR compensator (SVC), static synchronous compensator, STATCOM, etc.) and harmonic compensation (e.g., active filters). Electric spring (ES) has been introduced as a demand-side inverter-based technology to improve the power quality of critical loads by using various control methods
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