Operational Characteristic Analysis Of A Smes Magnet And Its Measurement And Control Platform

With the development of modern electric power transmission systems to meet the basic requirements of quality and stability, superconducting magnetic energy storage(SMES) has been highly valued by some developed countries due to its special advantages. This paper starts from the principle of a SMES system, and analyzed how the SMES technology to solve various problems to improve electric power systems. Then constructed the interactive circuit model and developed the calculation model for basic parameters of the SMES system. A measurement and control platform based on Labview technology was also developed, which was verified experimentally. The main contents of the article are presented as follows:1. A Simulink model for bridge chopper circuit’s charge, energy storage, and discharge was designed based on the SMES system’s principles. Then presented how the SMES is significant to improve electrical systems with the study of energy interaction in its operation. The energy interaction circuit model was constructed, which facilitated the analysis on characteristics of a practical SMES device.2. Two methods to calculate the magnetic field of arbitrary point of a HTS magnet were proposed, and two respect calculation models were also built. A magnet subdivision technology was proposed, which could enhance the calculation accuracy of above methods. Results with two different methods were compared, and we found the rapid method could save time significantly without affecting the accuracy. A calculation model for self inductance and mutual inductance of the magnet was proposed, which helps the structure design of the magnet.3. With the calculation model constructed above, superconducting related calculation models such as calculation models for limited current, n-value, AC loss were constructed, which help the analysis characteristics of superconducting magnets by presenting field distribution of each superconducting layer.4. A measurement and control platform for SMES system with Labview technology was developed. And a method for simulating the energy interaction in the SMES system was also proposed, which provided a convenient way for SMES in grid-connected experiment and verified efficiency of solving power fluctuations. Besides, this platform could be commonly used for measuring the critical current of a superconducting tape and its volt-ampere characteristics.Through a variety of calculation models, the analysis of the superconducting magnet characteristics can be carried out based on the comparison of theoretical calculation and simulation. Through the experiment platform, verification and test on characteristics of superconducting magnets can also be carried out.