1 Solution Introduction
1.1 Networking Architecture
The C&I microgrid energy storage solution has the following networking
architectures: on/o-grid PV+ESS system and o-grid PV+ESS system.
In o-grid scenarios, the load requirements are as follows:
1. The instantaneous peak current (basic current + inrush current) upon load
connection and disconnection shall not exceed 1.1 times of the PCS rated
current.
2. The total rated capacity of all loads shall not exceed 2/3 of the PCS rated
capacity.
3. Motor load constraints: The load of motors that use direct on line (DOL)
starters or star-delta starters shall not exceed 10% of the PCS rated power. The
load of motors that use variable frequency drives or soft starters shall not
exceed 2/3 of the PCS rated power. If the PCS carries load, the load of motors
to be connected and disconnected shall be decreased accordingly in the same
proportion.
4. Isolation transformer: The isolation transformer equipped for the PCS must be
started together with the PCS. Do not start the PCS before switching on the
isolation transformer.
5. Transformers on the load side (excluding isolation transformers): The load-side
transformers less than or equal to 50% of the PCS rated power can be
connected and disconnected independently, and those greater than 50% of the
PCS rated power shall be started together with the PCS.
6. Even harmonic load constraints: When the excitation reactive power of the PCS
transformer reaches 2.5 kvar (2.5% of the PCS rated power), 2.5% even
harmonics (calculated based on the typical 200 kVA transformer parameters)
are allowed. When the excitation reactive power of the PCS transformer
reaches 5 kvar or above (5% of the PCS rated power), 5% even harmonics are
allowed. When the PCS has no output fundamental wave current, loads with
even harmonics cannot be connected.
Commercial and Industrial Microgrid Energy Storage
Solution
Quick Guide (With Third-Party Microgrid Central
Controller) 1 Solution Introduction
Issue 04 (2023-12-18) Copyright © Huawei Digital Power Technologies Co., Ltd. 1
To Next Page
Loading...
