基于MCU-FPGA的风光逆变并网系统设计

Wind and solar power inverse grid-connected system

为了缓解能源问题,在完全兼容现有供电系统的基础上,该系统采用风能和太阳能对电能进行补给的方法,并且附带快速检测孤岛效应,快速并网和断网的功能。系统的功率电路部分采用全桥拓扑进行逆变,数字控制系统采用MCU-FPGA构架。由全硬件完成对外网市电的倍频工作,再由FPGA动态调整系统输出相位,让输出和外网市电实现同相位。MCU完成对太阳能电池板的最大功率点追踪(MPPT),发电端电压欠压检测以及孤岛效应检测等功能。针对电力系统强电的特性并结合当今热门的物联网技术,该系统人性化地设计了无线检测的功能,用户能通过手机,计算机或者手持式终端就可以了解当前系统状态。该系统创造性的设计方式既可以用于电厂的多能源并行发电,也适合家用,让家庭从用电的角色转变微型发电厂,从而大大的缓解能源问题。

To relieve the pressure and be completely compatible with current power-supply system, a wind and solar power inverse grid-connected system was designed. The system chooses wind and solar power as replenishment, employs the full-bridge structure as the power part, and has the functions of island effect test, quick grid connection and grid disconnec- tion. The digital control unit of the system uses the MCU-FPGA framework. Hardware circuit take all charge of frequency multiplication. FPGA is responsible for the output phase regulation. The maximum power point tracking （MPPT）, under- voltage detection and island effect detection are done by MCU. Combined with strong electricity characterristics of the power system and IOT technology, the wireless monitoring function was also endowed with the system. The system has the hom- mization function which users can get to know power state by mobile phone, PC or PDA. The creative design make the system easily used in power factory to achieve multi-power generator, and also fit family application, which means every family turns to be a mini power factory. In this way, the power issue can be relieved.