CEA Energy Storage & Grid Integration 2

Question 1

What is the primary purpose of frequency regulation in grid-connected battery energy storage systems (BESS)?

Accepted Answer

Maintain grid frequency within acceptable bounds (e.g., 59.95–60.05 Hz)

Answer

Frequency regulation services require fast-responding storage to inject or absorb power to keep grid frequency within tight operational limits.

Question 2

Which metric best describes a battery's ability to deliver stored energy relative to its rated capacity over its lifetime?

Accepted Answer

State of health (SOH)

Answer

State of health (SOH) quantifies capacity fade and power degradation compared to the battery's original specifications.

Question 3

A utility-scale vanadium redox flow battery (VRFB) is best characterized by which operational advantage over lithium-ion?

Accepted Answer

Independent scaling of power and energy capacity

Answer

In flow batteries, power (stack size) and energy (electrolyte volume) are decoupled, allowing independent optimization of each parameter.

Question 4

In grid integration planning, what does 'interconnection queue' refer to?

Accepted Answer

The backlog of generation and storage projects awaiting grid connection studies

Answer

The interconnection queue is the backlog of projects awaiting transmission studies and approvals before connecting to the grid.

Question 5

Which IEEE standard governs the interconnection and interoperability requirements for distributed energy resources including storage?

Accepted Answer

IEEE 1547

Answer

IEEE 1547 sets technical requirements for interconnection of distributed energy resources, including ride-through, voltage, and frequency response.

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