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Battery energy storage solutions

- May 15, 2018 -

Battery energy storage solutions

Battery energy storage systems are typically configured in one of two ways: a power configuration or an energy configuration, depending on their intended application.

In a power configuration, the batteries are used to inject a large amount of power into the grid in a relatively short period of time, which requires a high inverter-to-battery ratio. A typical application would be to simulate a turbine ramp up for frequency regulation, spinning reserve, or black start capacity.

In an energy configuration, the batteries are used to inject a steady amount of power into the grid for an extended amount of time. This application has a low inverter-to-battery ratio and would typically be used for addressing such issues as the California “Duck Curve” in which power demand changes are occurring over a period as long as several hours, or shifting curtailed PV production to later in the day.

This is accomplished by adjusting the ratio of inverters to batteries in the system. Imagine a bathtub, with the volume of water in the tub representing the batteries and the tub drain(s) representing the inverter(s). For a fixed level in the bathtub, several drain lines can be incorporated, resulting in a rapid discharge (a power configuration), or a single drain line can be incorporated resulting in a slower discharge (an energy configuration). In each case, the system has the same amount of water (stored energy in the battery), but the discharge rate is varied.

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