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随着智能电网建设的提出,单一耗电设备已经无法满足其发展要求,绿色、节能、并网型用电设备成为发展趋势。提出一种具有馈电功能的新型并网不间断电源(uninterruptible power supply,UPS)系统及其拓扑结构,并将该结构拆分为4个单相全桥电路,依次组成脉宽调制(pulse width modulation,PWM)整流馈电模块、隔离双向DC/DC模块以及逆变模块,从而使系统成为一可以四象限运行的电源装置。在此基础上,设计了系统的工作模式与分层控制体系,并将核心控制层离散为7个模块化的子控制器,通过它们的分散逻辑组合实现各部分的控制策略,从而达到不同工作模式下稳态和暂态运行的控制目标。最后,搭建了仿真系统和实验样机,验证了系统拓扑和控制的正确性及有效性。
With the construction of smart grid proposed, a single power-consuming equipment has been unable to meet its development requirements, green, energy-saving, and grid-based electrical equipment has become a trend. A novel uninterruptible power supply (UPS) system with feed function and its topology are proposed. The structure is split into four single-phase full-bridge circuits, which in turn form pulse width modulation modulation, PWM) rectifier feed module, isolated bidirectional DC / DC module and inverter module, so that the system becomes a four-quadrant operation of the power supply unit. On this basis, the system’s working mode and hierarchical control system are designed, and the core control layer is divided into seven modular sub-controllers. Through their decentralized logic combination, the control strategies of each part are achieved, so as to achieve different work Control targets for steady-state and transient operation in mode. Finally, the simulation system and experimental prototype are set up to verify the correctness and effectiveness of the system topology and control.