Dual-Mode Emergency and Peak Shaving Power System for Office and Commercial Buildings

• Customization: Available
• Type: Self-Starting Diesel Generator
• Installation Method: Fixed
• Model NO.: NCDG0042
• Stroke: Four Stroke
• Cooling Method: Water Cooling
• Output Type: AC Three Phase
• Conditions of Use: Land Use
• Usage: Common Units, Standby Unit, Emergency Crew
• Landuse Type of Unit: Low Noise Automation Type
• Rated Output (Kw/kVA): Support Customization
• Rated Voltage (V): 230/400V
• Rated Frequency: 50/60Hz
• Power Factor: 0.8lagging
• Cylinder Number: Support Customization
• Net Weight of Set (Kg): Specified
• Product Name: Silent Type Diesel Generator
• Transport Package: 1PCS/Carton
• Trademark: CE, ISO
• Origin: Made in China
• HS Code: 8504409999
• Production Capacity: 100pieces/Month

Product Description

Product Overview

Critical Loads Emergency Power System for Office Buildings is an integrated solution designed to protect mission-critical loads during grid failure. The system combines UPS System, Energy Storage System (BESS + PCS), Diesel Generator, and ATS (Automatic Transfer Switch) to achieve 0 ms class protection, stable voltage & frequency during transition, and long-duration backup power. Typical protected loads include data/server rooms, fire & life safety systems, security & access control, elevators, emergency lighting, and water pump systems. Nancome provides system design, equipment supply, and integration support for commercial buildings and data-critical facilities.

Product Parameters

Equipment	Model	Technical Specifications	Quantity	Function Description
UPS	UPS-100kVA	Input: 380VAC; Output: 380VAC; Battery voltage: 480VDC; Efficiency: 95%; Switchover: 0ms	2 units (parallel operation)	Zero-interruption protection for primary critical loads
PCS (Bi-directional Converter)	PCS-200kW	Bi-directional; Efficiency: 97%; THDi < 3%; Grid-tied/Islanded switching; Detection < 10ms, Switchover < 20ms; Phase difference < 2°	1 set	Peak shaving & valley filling, seamless emergency backup, microgrid support
Battery (LFP)	LFP-500kWh	Cell: 3.2V/280Ah; Cycle life: 6000 cycles @ 80% DoD	1 set	2-hour emergency backup + capacity base for peak-valley arbitrage
Generator	DG-400kW	Silent type; Rated: 400kW; Standby: 440kW; Cold start ≤ 10s; Load pickup ≤ 30s	1 unit	Long-term backup for sustained power outage scenarios
Intelligent Distribution Cabinet (ATS/Quad Power)	ATS-S400	Quad power automatic switching (Grid 1/Grid 2/ESS/DG); Switchover < 100ms; Interlocking + graded protection	1 set	Power dispatch and switching logic hub
Energy Management System	EMS-Pro	Monitoring + analysis + optimization + forecasting; Communication: Modbus/BACnet	1 set	System brain: strategy control, alarms, reports
Active Power Filter	APF-150A	Harmonic compensation, system THDi suppressed to < 5%	1 set	Power quality improvement, reducing risks for IT/precision loads
Isolation Transformer	IT-400kVA	Input: 540VDC side matching; Output: 380VAC side isolation; Harmonic blocking + safety isolation (engineering configuration)	1 unit	Electrical isolation, harmonic conduction blocking, output matching
DC Fuse	aR-100kA	Breaking capacity: 100kA; Response: 0.1ms	Several	Fast isolation protection for DC short circuits
Surge Protective Device	SPD-I/III	Class I impulse current ≥ 25kA; Class III residual voltage < 1.5kV; Grounding cable ≤ 0.5m	Several	Lightning/switching overvoltage protection for IGBTs and control boards
Rectifier (Optional Module)	Rectifier-100/200/400kW	Input: 3-phase 380VAC±10%, 50Hz; Output: 540VDC±1%; Efficiency ≥ 96%; PF ≥ 0.99; THDi < 5%	Optional	AC→DC energy supply and busbar stabilization, supporting high-reliability conversion links
Inverter (Optional Module)	Inverter-380V	Input: 480–600VDC; Output: 380VAC 3-phase 4-wire; THDv < 3%; Overload: 125%/10min, 150%/1min; Switchover < 10ms	Optional	DC→AC pure sine wave output, ensuring quality power supply for critical loads

Product Description

This integrated emergency power system combines UPS, Energy Storage System (BESS + PCS), Diesel Generator, and ATS to provide uninterrupted power supply for mission-critical loads. The system ensures 0 ms protection for critical loads, stabilized transition during 

generator startup, and long-duration backup for extended outages.

Mission-Critical Load Protection

Emergency power is designed to protect loads that cannot tolerate interruption, including data centers, life safety systems, security monitoring, elevator systems, emergency lighting, and essential water pump operations.

Load Classification Based on International Engineering Standards

Three-Level Coordinated Protection Architecture

The system design follows load priority principles to ensure reliable and standardized protection. Critical loads require 0 ms class protection, while secondary loads are stabilized through energy storage before generator takeover.

Stage 1: UPS ensures instant takeover for critical loads.
Stage 2: BESS + PCS bridge generator startup and stabilize voltage and frequency.
Stage 3: Diesel generator provides long-duration backup power through ATS synchronization.

Power Flow During Outage Mode

Why Generator Alone Is Not Enough

During grid failure, the system operates as a temporary microgrid. UPS provides zero-interruption protection, while PCS stabilizes voltage and frequency before the diesel generator assumes long-duration supply.

Startup delay (5–30 s)                            0 ms interruption via UPS
Voltage and frequency fluctuation        Stable transition through BESS + PCS
IT system reboot risk                               Full mission-critical load protection

Core Equipment Used in the System

PCS photovoltaic integrated cabinet

Integrated cabinet for wood-based energy microgrid

diesel generator

·Wide input voltage range
·Multi-channel MPPT
·Support both grid-connected and off-grid output
·Integrated MPPT/PCS/EMS

·Supports up to multiple devices in parallel
·Integrated BMS/PCS/EMS
·Integrated photovoltaic MPPT/energy storage lithium battery/diesel generator interface
·Grid-off/on switching time <10ms

Silent Diesel Generator Set
Automatic start and load transfer
Long-duration backup capability

Technical Specifications
1	Electrical Parameters	Rated Voltage: 380V / 400V / 415V / 480V (customizable) Frequency: 50Hz / 60Hz UPS Switching Time: 0 ms (critical load path) PCS Grid Transition Time: <20 ms ATS Transfer Time: ≤100 ms System Efficiency: ≥95% (overall architecture)
2	Energy Storage System (BESS)	Battery Type: Lithium Iron Phosphate (LFP) Battery Capacity Range: 100 kWh – 2 MWh Cell Specification: 3.2V / 280Ah (typical) Cycle Life: ≥6000 cycles @ 80% DoD Depth of Discharge: 80% standard Battery Management System: Integrated BMS with thermal monitoring
3	Power Conversion System (PCS)	Rated Power: 50 kW – 500 kW Bidirectional Conversion: Yes Conversion Efficiency: ≥97% Total Harmonic Distortion (THDi): <3% Parallel Operation: Supported Microgrid Mode: Supported
4	Diesel Generator	Power Range: 100 kW – 1000 kW Startup Time: ≤10 seconds Load Acceptance Time: ≤30 seconds Fuel Type: Diesel Noise Level: Silent enclosure optional
5	Protection & Power Quality	Harmonic Filter (APF): THDi <5% Isolation Transformer: Optional DC Fuse Breaking Capacity: Up to 100 kA Surge Protection: Class I & Class III supported
6	Communication & Monitoring	Protocol: Modbus / BACnet Remote Monitoring: Supported Energy Optimization: Supported Load Strategy Programming: Supported
7	Solution Note on Photovoltaic (PV) Integration	The default solution does not include PV to ensure the predictability and high reliability of emergency power supply. If the project requires PV integration, it can be designed as an extended item separately (subject to grid connection approval, anti-backflow measures, and protection strategy upgrade).

• Basement electrical room for UPS, ATS and distribution cabinets
• Dedicated battery room for LFP battery system and PCS
• Separate generator room with ventilation and noise control
• Cable routing between generator, ATS and critical load panels

System layout is customized according to building structure and local electrical codes.

FAQ

Q1: Can the system achieve zero interruption?
Yes. Critical loads are protected by UPS with 0 ms switching time. Generator and storage coordination ensures stable transition during extended outages.

 
Q2: Why is energy storage required if a generator is installed?
Energy storage bridges the generator startup window, stabilizes voltage and frequency, and prevents IT system reboot or sensitive load disruption.

 
Q3: How long can the system provide backup power?
Backup duration depends on battery capacity and generator configuration. Typical battery backup ranges from 30 minutes to 2 hours before generator takeover.

 
Q4: Can the system support peak shaving in addition to emergency backup?
Yes. The Energy Storage System can operate in dual mode, supporting both emergency backup and peak demand management.

 
Q5: Is the system customizable for different building sizes?
Yes. System configuration is customized based on critical load capacity, required backup duration, voltage level, and redundancy requirements.

 
Q6: Does the system comply with international standards?
The system design follows standard engineering practices and supports compliance with local electrical codes and building safety regulations.

Inquiry Guide

Information Required for Quotation
To provide an accurate system design and quotation, please share the following information:

    • Total critical load capacity (kW)
    • Required backup duration (minutes or hours)
    • Voltage and frequency (e.g., 400V / 50Hz)
   • Building type and installation location
   • Redundancy requirement (N or N+1)
   • Available installation space (electrical room, battery room, generator room)
   • 7-day load profile (if available)

Providing these details allows precise load analysis and optimized system configuration.