并离网系统不惧停电影响

并网系统和并离网系统的区别

光伏并网系统

特点：光伏并网系统，负载优先使用太阳能，当负载用不完后，多余的电送入电网，当光伏电量不足时，电网和光伏可以同时给负载供电，光伏发电依赖于电网和阳光，当电网断电时，逆变器就会启动孤岛保护功能，太阳能不能发电，负载也不能工作。

光伏并离网系统

光伏并离网系统由太阳能电池板、充电器、电池组、DSP控制器、逆变器等组成。通过充电器将PV直流输入转换为蓄电池和逆变器所需的电压；电池组可采用铅酸或锂电池,用来储存太阳能电池所发出的电能并可实时为负载或电网提供能量；DSP控制器用于MPPT跟踪处理、BUCK变换器开关管控制及全桥逆变控制, 实现系统DC-DC前级降压储能及双相逆变功能。

相对于并网发电系统，光伏并离网系统增加了充放电控制器和蓄电池，系统成本增加了一些，但是应用范围更广。一是可以设定在电价峰值时以额定功率输出，减少电费开支;二是可以电价谷段充电，峰段放电，利用峰谷差价赚钱;三是当电网停电时，光伏系统做为备用电源继续工作，逆变器可以切换为离网工作模式，光伏和蓄电池可以通过逆变器给负载供电

The difference between grid-connected and hybrid systems  

Photovoltaic grid-connected system  

Features: photovoltaic (pv) grid system, load is preferred to use solar energy, when the load to burn, redundant into electricity grid, when the photovoltaic battery is low, power grids and photovoltaic power supply to the load at the same time, photovoltaic power generation depends on the power grid and the sun, when power grid, the inverter will start island protection function, solar can't power, load can't work.  

The picture  

Hybrid system  

Photovoltaic off-grid system consists of solar panel, charger, battery pack, DSP controller, inverter and so on.  The PV DC input is converted into the voltage required by the battery and inverter through the charger;  The battery pack can use lead-acid or lithium batteries to store the energy generated by the solar cells and provide real-time power to the load or grid.  DSP controller is used for MPPT tracking processing, BUCK converter switch control and full-bridge inverter control, realizing dC-DC step-down energy storage and dual-phase inverter functions.  

Compared with the grid-connected power generation system, the photovoltaic off-grid system increases the charge and discharge controller and battery, which increases the system cost, but has a wider application range.   First, it can be set at the peak of the electricity price to the rated power output, reduce the cost of electricity;   Second, the price of electricity valley charge, peak discharge, the use of peak valley difference to make money;  Third, when the power grid fails, the photovoltaic system continues to work as a backup power supply, and the inverter can switch to off-grid working mode. Photovoltaic and battery can supply power to the load through the inverter