How does the photovoltaic boost box substation prevent the impact of voltage fluctuations and reverse flow on the power grid?

Publish Time: 2025-03-17

As a key device in the photovoltaic power generation system, the photovoltaic boost box substation has the main function of boosting the voltage output by the photovoltaic grid-connected inverter to a level suitable for grid access and outputting electrical energy. However, during the grid-connected power generation process, voltage fluctuations and reverse flow may have an adverse effect on the power grid.

Measures to prevent voltage fluctuations

Electrical calculations and design optimization: Detailed electrical calculations are performed during the design phase to ensure that the voltage deviation is within an acceptable range. This includes considering factors such as the installed capacity of the photovoltaic system, the balance of power output and local load. Optimize the design of the boost box transformer, adopt advanced power electronic conversion technology and high-efficiency transformers, improve conversion efficiency, reduce energy loss, and thus reduce the risk of voltage fluctuations.

Access system scheme adjustment: Adjust the access system method according to the actual situation of the photovoltaic system. For example, change the grid connection point or increase the grid connection voltage level to adapt to different power needs and ensure voltage stability.

Inverter power factor adjustment: Adjust the power factor setting value of the inverter, although it may affect the user's reactive power assessment, it can effectively cope with voltage fluctuations. By setting the power factor reasonably, the active and reactive power in the power grid can be balanced and the voltage fluctuation can be reduced.

Power distribution network transformation: The power distribution network is transformed as necessary to adapt to the access of the photovoltaic system. This includes enhancing the carrying capacity and stability of the power grid to ensure that the photovoltaic system will not cause excessive impact on the power grid when it is connected to the grid for power generation.

Photovoltaic installation capacity adjustment: Appropriately reduce the photovoltaic installation capacity to reduce power output, thereby reducing the risk of voltage fluctuations. This requires a trade-off based on actual conditions to ensure a balance between the economic benefits of the photovoltaic system and the stability of the power grid.

Measures to prevent backflow

Configure anti-backflow devices: Configure anti-backflow devices such as anti-backflow meters and circuit breakers in the photovoltaic boost box substation. These devices can monitor the output current and voltage of the photovoltaic power generation system in real time. When a backflow trend is detected, some photovoltaic equipment is cut off in time or the power output is reduced to avoid the occurrence of backflow.

Intelligent monitoring and remote management: Equipped with advanced intelligent monitoring systems to monitor electrical parameters, equipment operating status and power generation data in real time. Through the remote communication function, the operation and maintenance personnel can grasp the operation of the power station in real time, and promptly discover and deal with the reverse flow problem.

Optimize the grid connection strategy: formulate a reasonable grid connection strategy according to the requirements of the power grid and the actual situation of the photovoltaic system. For example, photovoltaic power is used preferentially during the peak load period of the power grid, and the output of photovoltaic power is reduced during the load valley period to reduce the occurrence of reverse flow.

Strengthen the grid dispatching and coordination: Strengthen communication and coordination with the grid dispatching department to ensure that the photovoltaic system matches the operating status of the grid when it is connected to the grid for power generation. Through reasonable dispatching and coordination, the impact of reverse flow on the power grid can be effectively avoided.

In summary, the photovoltaic boost box substation prevents voltage fluctuations through electrical calculation and design optimization, access system solution adjustment, inverter power factor adjustment, distribution network transformation, and photovoltaic installation capacity adjustment; at the same time, anti-reverse flow devices, intelligent monitoring and remote management, optimization of grid connection strategies, and strengthening of grid dispatching and coordination are configured to prevent the impact of reverse flow on the power grid. These measures jointly ensure the safe and stable operation of the power grid and the economic benefits of the photovoltaic system.