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Grid connected energy storage system

Author: Source: Datetime: 2016-11-22 11:22:51

1.1 system components


Storage energy station (system) mainly with photovoltaic power generation applications, therefore, the whole system includes a photovoltaic component array, photovoltaic controller, LiFePO4 battery pack, battery management system (BMS), the inverter and the corresponding Bess combined control scheduling system, power system.


The array of PV modules using photovoltaic solar panels to convert light energy into electrical energy, and then charge the lithium battery through the inverter to convert DC to AC power to the load; intelligent controller according to the change of sunshine intensity and load, switching and adjusting constantly work on the battery state: on the one hand, the adjusted the electrical energy directly to DC or AC load. On the other hand, the excess power can be sent to the battery pack. The power output can not meet the needs of the load, the controller to battery power sent to a load, to ensure the continuity and stability of the whole system; grid connected inverter system by several inverters, the DC battery in a standard 380V power user side low voltage network or the step-up transformer into high voltage power grid. Lithium battery pack in the system at the same time to play the role of energy regulation and balance load two. The output power of the photovoltaic power generation system can be converted into chemical energy storage to be used when the power supply is insufficient.


1.2 battery selection


As a part of the energy storage power station, the solar power battery can be improved by the use of photovoltaic power generation to achieve the energy storage power station, which can improve the power quality: 


Easy multi way combination, to meet the higher operating voltage and large current; detection and diagnosis of battery capacity and performance, the control system can realize the control of power load scheduling in predicting battery capacity and the performance of the case; the high safety and reliability: under normal circumstances, the normal service life of the battery not less than 15 years; in the limit, even if the fault occurred in the controlled range, explosion and combustion should not endanger the safe operation of the power station fault; with fast response and good high rate charge discharge capacity, charge discharge capacity and general requirements of 5-10 charge and discharge times; higher conversion efficiency; easy installation and maintenance; it has better environmental adaptability, wide temperature range.


Comparison of several kinds of battery


From the initial investment cost point of view, the lithium-ion battery has a strong competitive, sodium sulfur battery and all vanadium redox flow battery industry has not formed, the supply channel is limited, more expensive. From the operation and maintenance costs, the need for continuous heating of sodium sulfur, vanadium redox flow battery needs to pump for fluid control, increased operating costs, while the lithium battery is almost no need to maintain. According to the present situation and the characteristics of battery energy storage power station in China and abroad, it is suggested that the battery selection of the energy storage power station is mainly the lifepo4 batteries. Does not recommend the use of lead-acid batteries is the battery life of the problem, large brands of lead-acid batteries in the case of frequent charging and discharging of about only 2.5-3 years of life, a lot of lithium battery life.

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