CCAMTG-2500 A04 — Full Machine Assembly & System Architecture

The CCAMTG-2500 A04 is a complete dual-mode compressed-air energy-storage and recovery machine integrating multi-stage compression, thermal-energy recovery, high-pressure buffering, external compressed-air storage interfacing, reheated turbine expansion, a common high-speed rotor train, active magnetic bearings, touchdown bearings, a permanent-magnet motor-generator, bidirectional electrical power conversion, battery-energy-storage and grid interfaces, cooling, instrumentation, structural support, controls, protection and machine safety systems.

Main Public Specifications

Machine Class: 2.5 MW-Class Dual-Mode Compressed-Air Energy Storage / Recovery Magnetic Motor-Generator Machine
Net AC Generation: 2.50 MW
Nominal Rotor Speed: 12,000 rpm
Master Air Mass Flow: 12.2 kg/s
Compression Range: 1.20 bara → ~31 bara
Expansion Range: ~31 bara → 1.20 bara
DC Bus: 1,500 VDC
BESS Energy Capacity: ~5 MWh LFP
Dry Skid Mass (Estimated): ~22,000 kg

A04 Design Baseline: Published specifications represent the current CCAMTG-2500 A04 design baseline. Dimensions and preliminary engineering values remain subject to final confirmation under the approved A04 design freeze.

Full Machine System Overview

Dual-mode compressed-air energy storage and recovery architecture
Three-stage centrifugal compressor system
Three-stage reheated turbine system
Common high-speed rotor train
Permanent-magnet synchronous motor-generator
Active magnetic bearing system
Independent touchdown-bearing backup support
Thermal-energy recovery and reuse
High-pressure buffer vessel
External compressed-air storage interface
Bidirectional electrical power-conversion system
Battery energy storage and grid interface

Charge-Mode Operation

Electrical energy supplied through the approved grid and/or energy-storage path
Bidirectional converter operates the PMSM/PMG in motor mode
Motor torque drives the common rotor and three-stage compressor
Compressed air passes through staged intercooling
Recoverable compression heat is transferred into the thermal-energy system
Final compressed air passes through the HP buffer and storage interface
External compressed-air storage receives the charged pneumatic energy

Generation-Mode Operation

Stored compressed air is supplied through the external storage interface
High-pressure air passes through the HP buffer and turbine admission system
Recovered thermal energy is used for turbine preheating and reheating
Compressed air expands through three turbine stages
Interstage reheating supports controlled staged expansion
Turbine power drives the common rotor and PMSM/PMG in generator mode
Generated electrical energy is routed to the BESS and/or grid interface

Standby & Transition Operation

Magnetic-bearing levitation established before high-speed rotation
Cooling and control power established before motoring
Inactive high-pressure flow paths isolated
Rotor speed actively controlled during operating transitions
Electrical and pneumatic energy paths coordinated during mode changes
Trip functions remove energy sources and manage safe rotor coast-down

Common Rotor Architecture

Compressor, PMSM/PMG and turbine operate on the common rotor centreline
Mechanically coupled sections share the same instantaneous shaft speed
Modular rotor sections connected through high-speed diaphragm couplings
Rotor modules designed for independent balancing and service access
Thermal growth accommodated through the modular coupling architecture
Rotor design coordinated with rotordynamic and torsional analysis

Three-Stage Compressor System

Three sequential centrifugal compression stages
Stage-specific impeller and diffuser assemblies
Conditioned inlet and guide-vane architecture
Staged pressure rise through the complete compressor train
Intercooling between compressor stages
Final aftercooling before storage interfacing
Anti-surge recycle and protective control architecture
Compressor casing and labyrinth sealing system

Thermal Recovery & Intercooling

Heat removed after each compressor stage
Recovered compression heat transferred to a separate thermal-energy loop
Final aftercooler supports heat recovery before storage
Thermal-energy storage interface supports later reuse during generation
Thermal system coordinated with compressor and turbine operating states

High-Pressure Buffer System

Local compressed-air flow-stabilization vessel
Interfaces with compressor discharge
Interfaces with external compressed-air storage
Interfaces with the turbine admission path
Provides pressure buffering and controlled operating transitions
Provides isolation, relief and depressurization functions
Includes pressure and temperature instrumentation

External Compressed-Air Storage Interface

Long-duration compressed-air storage remains external to the machine skid
Storage system connected through controlled high-pressure interfaces
Fail-safe isolation incorporated into the storage connection
Reverse-flow prevention incorporated into the interface
Pressure control coordinated with independent protection functions
Storage design remains site-specific

Three-Stage Turbine System

Three sequential compressed-air expansion stages
Dedicated nozzle guide vane assemblies for each stage
Dedicated turbine wheel assemblies for each stage
Preheating before the first turbine stage
Reheating between successive turbine stages
Progressive shaft-power recovery through the turbine train
Diffuser and exhaust collector integration
Labyrinth sealing throughout the turbine architecture

Active Magnetic Bearing System

Non-contact radial rotor support
Non-contact axial thrust control
Multiple radial magnetic bearing stations
Double-acting axial magnetic bearing architecture
Continuous rotor-position monitoring
Rotor speed and phase sensing
Magnetic-bearing control integrated with machine protection

Touchdown Bearing System

Mechanically independent backup rotor support
Used during loss of magnetic levitation
Supports controlled rotor coast-down during defined fault conditions
Not used as the normal continuous running bearing system
Integrated with rotor dynamics and machine protection

PMSM/PMG Motor-Generator

High-speed permanent-magnet synchronous motor-generator
Motor operation during compressed-air charging
Generator operation during turbine-driven recovery
Variable-frequency three-phase electrical interface
Bidirectional power conversion
Closed-loop thermal management
Rotor retention and electromagnetic design integrated with the common rotor system

Electrical Power Conversion

Machine-side bidirectional active rectifier and motor inverter
Common DC power-distribution architecture
Precharge and main isolation functions
Continuous insulation monitoring
Battery energy storage and PCS interface
Grid-side inverter interface
Transformer and switchgear integration
Electrical metering and protection

Battery Energy Storage & Grid Integration

Battery-energy-storage interface supports charging and generation modes
Bidirectional PCS coordinates machine, battery and grid power flow
Battery-management data integrated with the energy-management system
Grid connection supports controlled import and export
Transformer and switchgear configuration coordinated with the installation site
Grid protection and synchronization governed by site-specific engineering

Machine Cooling System

Closed-loop cooling for the motor-generator
Cooling support for active magnetic bearing equipment
Cooling interfaces for power electronics
Cooling support for machine auxiliaries
Redundant pumping philosophy
Heat rejection, filtration and expansion management
Flow, temperature, pressure and differential-pressure monitoring

Valve & Process Control Architecture

Fail-safe external storage isolation
Fail-safe turbine inlet control
Compressor discharge isolation
Protective anti-surge recycle
Reheater isolation
Independent buffer-vessel overpressure relief
Controlled depressurization and blowdown
Passive reverse-flow protection

Instrumentation & Monitoring

Compressor inlet and discharge pressure monitoring
Buffer-vessel pressure monitoring
Main air-flow monitoring
Compressor temperature monitoring
Turbine preheat and reheat temperature monitoring
Turbine outlet temperature monitoring
Rotor vibration and position monitoring
Redundant rotor-speed sensing
Filter condition monitoring
Condensate and drain monitoring where required

Control System & Operating Sequences

Startup permissive verification before high-energy operation
Magnetic-bearing levitation and centring before rotor acceleration
Cooling availability verified before motoring
Controlled DC-bus precharge
Charge-mode sequencing with compressor anti-surge protection
Generation-mode sequencing with turbine preheat and reheat
Controlled transition between motoring and generation
Integrated trip and shutdown hierarchy

Machine Protection & Trip Functions

Overspeed protection
Magnetic-bearing instability protection
High-vibration protection
High-pressure protection
Cooling-failure protection
Electrical-fault isolation
Fire and emergency-stop response
Controlled high-pressure isolation
Controlled depressurization
Safe rotor coast-down management

Structural Skid & Foundation Interface

Integrated welded machinery skid
Structural support for compressor, motor-generator and turbine modules
Support interfaces for magnetic bearings and touchdown bearings
Support interfaces for heat exchangers and cooling equipment
Support interface for the HP buffer vessel
Machinery mounting and alignment system
Grout and anchor interface
Lifting and transport provisions
Site-specific foundation interface

Fasteners, Joints & Sealing

Critical bolted-joint engineering
Controlled fastener preload
Pressure flange and gasket systems
Compressor and turbine casing joints
Rotating-component retention systems
Structural mounting joints
Labyrinth and static sealing systems
Joint inspection and lifecycle traceability

System-Level Component Families

Compressor module
PMSM/PMG module
Turbine module
Radial active magnetic bearing assemblies
Axial active magnetic bearing assembly
Touchdown-bearing assemblies
High-speed diaphragm couplings
Compressor intercoolers
Aftercooler and heat-recovery exchanger
Turbine preheater
Interstage reheaters
HP buffer vessel
Anti-surge recycle system
High-pressure control and isolation valves
Cooling package
AMB controller and power amplifiers
PLC, SIS and HMI systems
Electrical conversion package
Battery energy storage
Grid transformer and switchgear
Structural skid and guards
Instrumentation
External compressed-air storage interface
Thermal-energy storage interface

Manufacturing & Quality Integration

Controlled manufacturing documentation across all machine subsystems
Traceable materials and critical components
Subsystem-specific machining and fabrication controls
Qualified welding and pressure-boundary procedures
Critical rotor balancing and alignment controls
Electrical and instrumentation verification
Inspection and non-destructive examination
Controlled assembly and installation records

Required Engineering Analysis

Thermodynamic cycle modelling
Compressor aerodynamic analysis
Turbine aerodynamic analysis
Heat-exchanger and thermal-energy-storage modelling
Rotor dynamics
Torsional analysis
Rotor and wheel structural analysis
Skid and foundation structural analysis
Magnetic-bearing electromagnetic and stability analysis
Motor-generator electromagnetic design
Pressure-vessel code calculations
Electrical protection and short-circuit analysis
Hazard and safety analysis
Site foundation and structural engineering

Safety Architecture

Independent mechanical overpressure protection
Fail-safe high-pressure isolation
Protective compressor anti-surge architecture
Redundant rotor-speed monitoring
Magnetic-bearing fault management
Touchdown-bearing fault support
Electrical insulation and earthing protection
Fire detection and emergency response integration
Guarding of high-energy rotating and pressure-containing components
Controlled depressurization before maintenance

Verification & Performance Acceptance

Rotor-speed regulation verification
Compressed-air flow verification
Compressor performance verification
Turbine performance verification
Electrical generation verification
Magnetic-bearing vibration verification
Overspeed protection testing
Anti-surge protection testing
Pressure-protection verification
Operating-mode transition verification
Battery-energy-management interface testing
Integrated factory and site acceptance testing

Master Design Rules

Serial process-flow paths maintain mass-balance consistency
Mechanically coupled rotor sections share one instantaneous shaft speed
Every claimed output is tied to its defined energy source and conversion losses
Mechanical, electrical and thermal power quantities remain clearly distinguished
Pressure boundaries include controlled pressure, temperature, material and protection requirements
High-speed rotor geometry remains subordinate to approved rotor and stress analysis
Aerodynamic geometry remains subordinate to approved performance analysis
Critical bolted joints receive controlled preload engineering
Electrical systems receive coordinated voltage, current, fault and thermal verification

Full Machine Engineering Package

Master Blueprint Document
General arrangement and datum control
Air-intake and conditioning engineering
Three-stage compressor engineering
HP buffer vessel engineering
Three-stage turbine engineering
Active magnetic bearing and touchdown-bearing engineering
Thermal, cooling and airflow engineering
Structural skid and foundation-interface engineering
Electrical power-conversion engineering
Fasteners, joints and sealing engineering
Manufacturing engineering
System architecture and functional integration
QA, inspection and NDE
Assembly and installation engineering
Maintenance and service engineering
Controls, PLC, SIS, HMI and SCADA
Commissioning and performance acceptance
Safety-case and hazard-control engineering
Supporting calculation and analysis volumes