Modling Of Superconductor Magnetics Energy Storage And Its Interaction Impact Mechanism On The Grid

Superconductor magnetic energy storage(SMES) has the advantage of high efficiency in conversion, large power throughput rate and so on, which make it prospects application in power systems, such as improving transient stability of power system, regulating peak load, increasing power standby capacity and improving power quality and so on. However, these applications could be realized in other usual storage energy and didn’t take full advantage of SMES. Addressing to these use limitations, this paper establishes the detail model of the system. The equivalent model of superconductor windings is built. A charge-discharge control is brought out based on the converter. Simulation in EMTP has been done, the results shows that the converter has well characteristic and could satisfy the requirement of the system. Interaction with the grid is given. Based the large power throughput rate of SMES, the author used it to absorb the stochastically and pulse fluctuating power component in the grid, which could keep the area controlled error(ACE) almost zero.Based on the basic structure, this paper brings out two models of the superconducting windings, equivalent inductance models and lumped parameter model. It is simple in the first model and could meet the requirements of electrical simulation. The second model is a little complexion than the first because it has considered the capacitance effect between the windings. It has a directive significance guiding significance for superconducting manufacture. The SMES has the advantage of high efficiency with the reason that there is not power form exchanged while converting the energy situation. This means that its grid-connected inverter must have the same characteristic. Based on the usual used diode-clamped three-level inverter, this paper proposes a new type of converter with t-shaped topology, ANPC. The control method is brought out in the later and completes its simulation in EMTP, the results shows its high efficiency and well characteristics. In the end, a mall experiment prototype based on DSP has been done, the results shows the high efficiency.This paper has researched the peed and control strategy of charge and discharge about superconductor windings and explored its impact factor. Consider the characteristics of fast charging and discharging, we proposed that use SMES to regulate the ACE. Simulation in regional is given, and the results indicate the functions and the method keeps the limitation that that regulates the peak power in a long time with large standby power capacity. Finally arithmetic and control method are proposed to improve the power quality based on ANPC. Simulations are shown in the end under different load, and the results indicate its function.