After decades of development, photovoltaic power generation have made some achievements. Photovoltaic grid connected power generation system is composed of photovoltaic array, solar charge controller and grid connected inverter. It converts the direct current generated by solar inverter to grid connected inverter and converts it into a power generation system that meets the requirements of grid. Photovoltaic grid connected power generation system can supply power directly into the power grid, but the stability of the power generation process is poor, and it will also have a certain impact on the power grid.
Photovoltaic grid connected power generation and load characteristics
Photovoltaic power generation is greatly affected by the environment, and its power generation will increase with the increase of illumination. Generally, when the sunshine is shining, the power peak is generally at the strongest point of sunshine, which is about 10:00 ~ 14:00. When PV grid connected to large capacity, the load curve will also change. For example, the peak load of a photovoltaic power park appears at about 9:00, while 10:00 ~ 14:00, the equivalent load appears to be small.
PV grid connected power generation and grid planning
With the development of photovoltaic power generation capacity, the load and anti power will show some changes, which makes the original grid to meet the demand hardly, it needs to be replanned in accordance with the actual situation, re scheduling operation mode of power grid, increased the daily workload of relevant personnel to a certain extent, also increased the capital investment.
PV grid connected power generation and scheduling
At present, the photovoltaic power generation is not mature, and the automation function is not perfect, which makes the scheduling situation difficult to change with the voltage and frequency of the power grid. Under the original scheduling, the change of the power grid data will directly lead to the reduction of the dispatching capacity of the power grid, which will make the control and scheduling of power grid more and more difficult.
Photovoltaic grid connected generation and voltage
More and more photovoltaic power is connected to the end and terminal of the feeder line of the power grid, while there is a reverse trend in power grid, which makes the current photovoltaic power generation by the influence of feeder in power grid and will produce pressure drop. The voltage of the substation side is reduced, while the load side voltage is unequal to the side voltage of the substation, which makes the load side voltage there is limit. In addition, according to the relationship of voltage and current, when the current photovoltaic power generation changes, the current is bound to be followed by the change of the power generation and photovoltaic power generation light illumination are closely related, which causes the voltage fluctuation is bigger, may cause power in reactive power regulation for frequent action. effecting adjusting device service life and the safe operation of the power grid.
Photovoltaic grid connected power generation and power grid protection
At present, the middle and low voltage power grid in China is mainly divided into two kinds: the radiation type power supply network and the ungrounded single side power supply. At present, the protection principle of substation mainly includes three kinds: automatic recloser on main feeder, fuse in branch and three stage current protection device on circuit breaker. But the current photovoltaic power generation to large capacity development, so that the grid is no longer a single source radial network into a double end even multiterminal networks caused by the fault current direction, duration and current size change, these changes may cause the circuit breaker tripping, malfunction, resulting in fuse is to lose the original selectivity and protection performance, difficult to guarantee the safe operation of power grid. In addition, the solar grid tie power system itself fault and its anti island protection function, automatic reclosing will also change.
PV grid connected power generation and distributed generation unit
A small amount of distributed generation units have little impact on the power grid, when the distributed generation unit reaches a certain limit, it will cause changes to voltage flicker, harmonics, power loss, power flow, load characteristics and other related components, leading to effect on power grid operation quality, stability and safety.
REVO Series Wall Mounted Integrated Solar Hybrid Grid Tie Inverter With Built-in MPPT Solar Controller
1.Touch screen display.
2.Output power factor PF=1.0
3.On grid with energy storage.
4.Energy generated record, load record, history information and fault record.
5.Language and time setting.
6.Structure with dust filter.
7.AC charging and AC output time setting.
8.Charging voltage and charging current timing.
9.External wi-fi device optional.
10.Parallel operation with up to only available for.
11.Smart battery charger design.
