Designing an Applicable MIMO DC-DC Converter with Multivariable Controller for SMES System

In modern power systems, utilization of renewable energy sources makes some difficulties for the power grid. One of these problems is shortage of electrical power during conditions which renewable energy sources cannot generate electrical power. For example, during shading conditions, the output power of the PV array is negligible. Using SMES (Superconducting Magnetic Energy Storage) systems is one of the applicable solutions which has been proposed to solve mentioned problem. In SMES system, energy is stored at high power inductances and during critical conditions; this power can be delivered to the load. One of the important parts of SMES systems is Multi input - Multi Output (MIMO) DC-DC converter. In this paper, at first step, one topology has been designed for the MIMO DC-DC converter. This topology has remarkable advantages such as fewer electrical elements and better controllability than other topologies. In the second part of this paper, based on multivariable controller strategy, an efficient controller has been designed for the SMES system which can set the output voltages of DC-DC converter at predetermined values. The most important feature of proposed controller is its efficiency at different conditions which some of these conditions make serious problems for conventional controllers. Generally, the objective of this paper is designing one SMES systems with an appropriate controller, which can regulate the output voltages at different conditions.