Most of the state grid, photovoltaic (pv) proportion of distributed generation, such as no more than 10% of the power grid, more than will join the energy storage system, pv system is connected to the grid if not using energy storage inverter
system, pv systems will be brought some negative influence to power network, and, with the continuous expansion of photovoltaic power generation systems and photovoltaic power in the system, the increasing proportion of these effects cannot be ignored.
The impact on the power flow.
When not connected to the photovoltaic (pv) grid power generation system, power grid branch tidal current is generally one-way flow, and for distribution network with increasing distance from the substation drab reduce active trend.
However, when the pv power grid, fundamentally change the trends of system pattern and trend has become impossible to predict.
The trend of change makes the voltage adjustment is difficult to maintain and even lead to the abnormal response voltage adjustment of the distribution network equipment, (
The impact on the system protection.
When the light is good, the photovoltaic (pv) grid power station output power is larger, the short circuit current will increase, may cause the over-current protection with error, and excessive short-circuit current will affect the normal work of the fuse.
In addition, before access to the photovoltaic power generation systems for distribution network branch trend generally is one-way, protection does not have its orientation, and photovoltaic power generation system after the access to the distribution network into a multi-source network, the flow of network trend is uncertain.
Therefore, must require additional directional protection device.
The influence of the economical operation of power grids.
Due to its output of photovoltaic (pv) power supply instability, when the photovoltaic system parallel operation, the system must increase the corresponding spinning reserve capacity, to ensure the system's ability to peaking and frequency modulation, that is to say, the photovoltaic (pv) grid power generation system to the grid power supply, reduce the unit use hours, at the expense of grid economy running (
The impact on the power quality.
Affected by cloud cover, a power of photovoltaic (pv) power supply could fall below 30%, from 100% in a short time or increased by 30% to 100%, for large photovoltaic (pv) grid system, will cause the voltage fluctuation and flicker or frequency fluctuations.
In addition, due to the photovoltaic power generation system of electric power for dc, must pass a inverter device connected to the electricity grid, a process that will generate harmonic, cause an effect to the grid.
The impact on the running schedule.
Photovoltaic (pv) power output of the power supply is directly affected by the weather and control, as a result, photovoltaic power constrained scheduling sex also, when a system to a certain proportion of photovoltaic power supply, power grid operators should seriously consider how to safe and reliable electric power dispatching.
In addition, pv electricity price and regular price, there are differences on how to meet the various security constraints for economic dispatch of power grids will also be a concern.
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