Power Control Concepts

There are several reasons why dynamic generation management is required - the most frequent two reasons are due to regulatory restrictions on exporting power from a location, and co-generation with a backup power source such as a diesel generator.

Power Limiting With Grid-Tie Plants

When a solar power plant is installed on a building, it will generate the maximum power that it can at all times regardless of the current building load.
Figure depecting the utility grid at the left, a bidirectional energy meter and a solar inverter and building load at the right

In many areas of the world it is not permitted to export power to the utility grid. In these locations it is crucial to be able to regulate the power on the solar plant to ensure that it is always less than or equal to the building load.

The Wattmon monitoring solution connects to the energy meter and inverter via a communication protocol called Modbus and dynamically regulates the generation on the inverter to meet predefined set points, thus ensuring that no power is exported.

Power Limiting With Generators

Solar power plants can be run while a genset is active but it is crucial to ensure that a minimum load on the generator is maintained at all times. Due to this many power plants are simply shut off when a backup energy source is activated.
Figure depecting a genset at the left, a unidirectional energy meter and a solar inverter and building load at the right

The Wattmon monitoring solution connects to the energy meter and inverter via a communication protocol called Modbus and dynamically regulates the generation on the inverter to meet predefined set points (usually about 30% of the generator rated capacity), thus ensuring that minimum loading is always maintained on the generator.

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