Abstract
This paper presents a generalized linear model based on LMI state-feedbackwith integral action, applicable to the control of Electric Energy Stora-ge Systems (EESS) such as Superconducting Magnetic Energy Storage(SMES) and Supercapacitor Energy Storage (SCES). A Voltage SourceConverter (VSC) and a Pulse-Width modulated Current Source Converter(PWM-CSC) are respectively used to integrate the SCES and the SMESsystems to the electrical distribution system. To represent the dynamicsbetween the EESS and the power distribution system a reduced generallinear model in the state-space representation is introduced. The proposedcontrol scheme regulates independently the active and reactive power flowbetween the EESS and ac the grid. Three case scenarios comparing a con-ventional PI controller and the proposed technique are conducted conside-ring grid voltage fluctuations. Extensive time-domain simulations demons-trate the robustness and proper performance of the proposed controller to operate the EESS as power compensator, in order to improve the operativeconditions of electrical distribution systems.
Highlights
Energy storage systems (ESS) play an important role in balancing supply and demand in the electric grid
Depending on how the energy is stored, the ESS can be classified in electrochemical energy storage, mechanical energy storage and electrical energy storage systems (EESS) (e.g., Super magnetic energy storage (SMES) and super-capacitor energy storage (SCES), which store energy in the magnetic and electric field respectively)
Notice that when pac is zero, the current idc remain constant because no power is transfered between the SMES and ac grid
Summary
Energy storage systems (ESS) play an important role in balancing supply and demand in the electric grid They help the power transmission and distribution systems to improve operative conditions such as power system stabilization [1], [2], load frequency control [3], [4], damping of the. The ESS can be applicable in electrical power systems to: Load shifting, peak shaving, frequency and voltage control, wind and solar farms voltage fluctuations, among others Despite their multiple advantages electrochemical and mechanical energy storage have disadvantages such as: Low efficiency, life-time limited, susceptible to charge/discharge cycles, slow response, short-time periods between maintenances, etc. The main objective of this paper it is to propose a general dynamical model to control EESS via LMI-Feedback control taking into account the properties of the VSC and PWM-CSC. Section six provides conclusions and remarks of the research
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