ABB calls the HiPerGuard's unique architecture “ZISC” – Impedance (Z) Isolated Static Converter. ZISC is a high performance, high efficiency power conditioning and uninterruptible power supply architecture. It is based on an isolating line reactor coupled with high performance ABB power converters. This simple approach, backed up with advanced control, provides unmatched reliability and performance, with class leading efficiency.
Decoupled from the utility via the isolating line reactor, the power converters continuously condition and filter utility disturbances without cycling the energy storage. Load related events, such as downstream faults and other dynamic reactive current demands, are managed with ZISCs high overload capability.
Inside ABB’s HiPerGuard MV UPS
- Isolating line reactor. This sits between the loads and the power supply. It blocks disturbances from the grid. To simplify maintenance, the isolating line reactor and coupling transformer are medium voltage, while the power converters and energy storage are low voltage.
- Coupling transformer. This converts the grid voltage into low voltage, and the voltage generated by the converters into medium voltage.
- System controller. This is the main controller, interfacing with all the different system components.
- Touchscreen HMI. ABB’s intuitive touchscreen interface. HiPerGuard can also be controlled remotely.
- PEBB (Power Electronic Building Block). These high-efficiency, high-performance multi-level converters connect to the low-voltage side of the coupling transformer. In power conditioning mode, HiPerGuard can provide up to five times the nominal current for two seconds. In independent mode, it’s four times nominal current for two seconds.
- Medium voltage switchgear. This houses the input, output and automatic bypass breakers, controlled by HiPerGuard via a high-speed fiber optic link. Energy storage. The lithium-ion battery can provide autonomous operation from a minute to hours. It supports the main response functionalities. Communication is via Modbus TCP connection.
