Research Of New Three-Phase Emergency Power Supply

With the continuous development of industrial and electric power technology, high-rise buildings, factories and other public places demand on power supply increasable. When the electricity fails, it will impact on people's lives and the economy. In this case, high-performance Emergency Power Supply is increasingly applied to the national economy and people's life.Based on researching the three-phase EPS transformation technology and applications, according to the faults of circuit complexity and low utilization rate with direct-current voltage at the traditional EPS, this paper researched a new type of three-phase emergency power system, which system consists bidirectional DC/DC conversion circuit and bidirectional PWM converter. Inverter is the core of EPS. In order to improve voltage output waveform quality and energy utilization of EPS, this paper conducted study of which in-depth. Firstly, using advanced space vector pulse width modulation technology, it obtains higher voltage utilization. Secondly, basing on the vector coordinate transformation, using voltage and current double closed-loop control, this paper transforms the three-phase inverter output voltage change to the d-axis and q-axis to decoupling control. By building simulation model, it proved that inverter can also output perfect voltage waveforms with a good degree of balance, symmetry strong distortion, whether with a resistive load or inductive load. In addition, this paper analyzed digital lock-in technique of inverter by Digital Signal Processor and achieved lock-in function from the electricity to the inverter.Based on theoretical analysis and system design, we built the EPS experimental circuit based on the conformity of L2407 DSP, and program generation of space voltage vector PWM, software Lock, and PI regulator module control. Simulation and experimental results show that the new EPS can output a good waveform quality and stable working system.Figure [66] table [9] reference [32]...