In this post, we only talk about distributed PV power plant.
Following issues, we need to consider when we connect a distributed PV plant to local grid network.
Grid voltage adjustment: According to the requirements of the power grid company, adjust the grid voltage of the distributed photovoltaic power station to ensure its matching with the grid voltage. This is achieved by using distribution transformers or power electronic devices for voltage adjustment.
Frequency adjustment: Distributed photovoltaic power plants need to maintain a consistent frequency with the power grid, usually 50Hz or 60Hz. Use inverters and other devices to adjust the frequency of the current to meet the requirements of the power grid company.
Power control: Distributed photovoltaic power plants need to control power according to the needs of the power grid to avoid causing excessive impact or load on the power grid. By adopting intelligent control systems, power electronic devices, and power grid scheduling management.
Current limitation: In order to protect the safe operation of the power grid and photovoltaic power plant equipment, current limitation devices are used to control the output current of distributed photovoltaic power plants, preventing the current from exceeding the capacity of the power grid or the equipment’s bearing capacity.
Grid protection device: Distributed photovoltaic power plants need to be equipped with grid protection devices to automatically cut off the connection to the grid in case of grid failure or abnormal situations, protecting the safe operation of the grid.
Power grid monitoring and communication: Establish an effective power grid monitoring system to monitor the status and operating parameters of the power grid in real-time. By adopting communication technology, distributed photovoltaic power plants can exchange information and remotely control with the power grid.
Adhere to grid access standards and regulations: Ensure that the design, construction, and operation of distributed photovoltaic power plants meet the requirements and can be safely connected to the grid in accordance with local power industry standards and regulations. Power grid capacity enhancement: If the scale of distributed photovoltaic power plants is large and exceeds the capacity limit of the power grid, consider upgrading and capacity enhancement of the power grid. This includes increasing substation capacity, expanding transmission lines, and upgrading distribution equipment.
Power quality regulation: The grid connection of photovoltaic power plants causes power quality issues, such as voltage fluctuations, harmonic disturbances, etc. Adopting power quality regulation equipment, such as reactive power compensation devices and harmonic filters, to improve power quality and meet grid connection requirements.
Power grid planning and management: In the planning and design phase of distributed photovoltaic power plants, the feasibility and adaptability of grid access should be considered. Through reasonable power grid planning and management, including reasonable layout of power stations, optimization of power grid structure, and load dispatch, the problem of power grid connection is minimized to the greatest extent.
Regulatory and policy support: Reasonable regulatory and policy support promotes the grid access of distributed photovoltaic power plants. Local government formulate relevant regulations and policies, provide supporting technical guidance and economic incentives, and promote the smooth integration of photovoltaic power stations and the power grid.
Cooperation and coordination: The grid access of photovoltaic power stations should be coordinated and cooperated with power companies, grid operators, and other relevant parties. Timely communication, information sharing, and problem-solving can promote the smooth integration of the power grid.
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