CCAMTG-2500 A04 — Electrical Power Conversion & Energy Control

Volume 09 defines the CCAMTG-2500 A04 electrical power conversion subsystem, providing the bidirectional electrical interface between the PMSM/PMG machine, common rotor, battery energy storage system, grid connection and auxiliary control systems. The architecture supports motoring during charge operation, electrical generation during turbine-driven operation, controlled transitions between operating modes, DC power distribution, energy storage interfacing, grid conversion, protection, metering, auxiliary power, earthing, bonding, cooling and coordinated machine-control functions.

Electrical Power Conversion System Overview

Bidirectional PMSM/PMG power-conversion architecture
Machine-side active rectifier and motor-inverter functions
Common DC power-distribution system
Battery energy storage and PCS interface
Grid-side inverter interface
Transformer and switchgear integration
Auxiliary AC and DC control-power supplies
Electrical metering and monitoring
Protection, isolation and interlocking
Earthing, bonding and cable-segregation architecture

Charge-Mode Electrical Operation

Electrical energy supplied from the grid and/or approved energy-storage path
Bidirectional power converter operates in motoring mode
PMSM provides controlled torque to the common rotor and compressor system
DC-bus regulation maintained throughout charge operation
Current limiting protects the machine, converter and power-distribution system
Precharge completed before main high-energy circuit closure
Torque control coordinated with compressor and machine-control functions

Generation-Mode Electrical Operation

Turbine-driven common rotor transfers mechanical power to the PMG
Variable-frequency machine output converted through the active rectifier
Generated electrical energy transferred into the common DC system
Energy dispatched to the BESS and/or grid-conversion path
Grid inverter manages export to the installation electrical system
Power flow limited by machine, converter, storage and grid permissions
Generation coordinated with turbine and rotor-speed control

Standby & Transition Modes

Safety and control systems remain available during standby
Main power paths isolated as required by operating state
Auxiliary power maintained for PLC, SIS, AMB, cooling and instrumentation
Controlled transfer between motoring and generating operation
DC-bus stability maintained during operating transitions
Reverse power and uncontrolled electrical transients prevented
Rotor and magnetic-bearing stability preserved during mode changes

PMSM/PMG Electrical Interface

High-speed permanent-magnet synchronous motor/generator architecture
Variable-frequency three-phase machine interface
Bidirectional operation for motoring and generation
Industrial inverter-duty electrical insulation system
Dedicated machine terminal assembly
Cooling interface integrated with the machine thermal system
Electrical-machine control coordinated with rotor-speed and torque commands

Machine-Side Converter

Bidirectional active rectifier and motor-inverter operation
Motoring control during compressor charge operation
Active rectification during turbine-driven generation
Closed-loop torque and current control
DC-bus regulation
Safe converter blocking during faults
Controlled electrical braking where approved energy absorption is available
Protection against overcurrent, thermal overload and abnormal bus conditions

DC Power Distribution

Common DC bus connecting machine conversion, energy storage and grid conversion
DC-link energy storage and filtering
Main DC switching and isolation architecture
Controlled precharge before full bus energization
Stored-energy discharge provisions
Lockable service isolation
Continuous insulation monitoring
DC voltage and current measurement

Precharge & Isolation System

Precharge path limits electrical inrush before main closure
Bus voltage rise monitored during energization
Main isolation enabled only after acceptable precharge conditions are verified
Precharge path removed or bypassed after verified main closure
Faulted converters blocked before coordinated isolation
Stored electrical energy discharged before maintenance release
Lockout and verified isolation incorporated into service procedures

Battery Energy Storage Interface

Bidirectional electrical interface to the battery energy storage system
Battery-management permissive and trip integration
State-of-charge and state-of-health monitoring
Available charge and discharge power communicated to the energy-management system
Battery voltage, current and thermal limits integrated with control logic
Isolation and battery fault status monitored
Fire, gas and thermal alarms integrated with emergency shutdown logic
PCS active and reactive power commands coordinated with system operation

Grid Inverter & Utility Interface

Bidirectional grid-conversion architecture
Grid-code compliance coordinated with the installation jurisdiction
Controlled electrical import during charging
Controlled electrical export during generation
Reactive-power and power-factor capability coordinated with site requirements
Grid synchronization and anti-islanding functions
Harmonic performance coordinated through grid and converter studies
Utility and site protection requirements integrated with machine protection

Transformer & Switchgear

Site-rated transformer interface
Grid switchgear and isolation
Protection ratings coordinated with the electrical fault study
Interlocking between converter, transformer and switchgear systems
Operational and revenue metering where required
Site voltage and transformer ratio controlled by installation-specific engineering
Switchgear fault duty and protection coordinated with the approved site study

Auxiliary Electrical Power

Control power for PLC, SIS, HMI and SCADA
Power supplies for active magnetic bearing controllers and amplifiers
Cooling-pump and thermal-system auxiliary loads
Converter cooling auxiliaries
Valve actuator power
Instrumentation and metering power
UPS or ride-through support where required by the safety case
Safe shutdown capability maintained independently of the main power path where required

Control-Power Philosophy

Safety-critical controls do not rely solely on the main high-energy DC system
Auxiliary control power supports safe machine shutdown
Loss of normal auxiliary power generates alarms and controlled unloading actions
Magnetic-bearing and cooling capability protected during power disturbances
Emergency-stop functions use fail-safe or safety-rated architecture where required
Control power integrated with wider machine hazard and safety functions

Electrical Metering & Monitoring

DC bus voltage measurement
DC current and power-flow measurement
AC voltage and current measurement
Active and reactive power monitoring
Power-factor monitoring
Frequency and energy measurement
Converter temperature monitoring
Cooling flow and temperature monitoring
Rotor speed and phase-reference monitoring
Breaker, contactor and disconnect status monitoring

Electrical Protection System

Converter overcurrent and short-circuit protection
DC overvoltage protection
DC undervoltage protection
Continuous insulation-fault monitoring
Machine and converter thermal protection
Grid fault and loss-of-grid response
BESS fault isolation
Overspeed coordination with machine torque removal
AMB instability coordination with high-energy drive removal
High-vibration shutdown coordination
Cooling-failure derating and shutdown
Fire and emergency-stop electrical isolation

Trip & Interlock Coordination

Motoring torque removed during critical machine faults
Generation blocked or limited during unsafe operating conditions
Faulted electrical paths isolated in a coordinated sequence
Rotor deceleration coordinated with available energy-absorption paths
High-pressure process isolation coordinated with electrical trips
Safe rotor coast-down preserved through active magnetic bearing support
Reset permitted only after the initiating fault condition is cleared

Earthing & Bonding

PMSM/PMG frame incorporated into the protective bonding network
Machine skid and structural assemblies bonded
Converter cabinets and switchgear bonded
Transformer enclosure bonded
Cable trays and guards bonded where required
Dedicated low-impedance bonds used across removable interfaces where required
Machine shaft-voltage and bearing-current mitigation coordinated with electromagnetic design
Site earthing coordinated with installation-specific electrical engineering

EMC & Cable Segregation

High-power DC routes segregated from low-level instrumentation
Converter-to-machine power cabling controlled for high-frequency effects
Grid and auxiliary AC cabling separated from sensitive control circuits
Analog instrumentation uses shielded low-noise routing
Safety I/O routing preserves independence where required
Industrial network and fibre routes physically separated as required
Cable shielding and screen termination coordinated with EMC requirements
Redundant safety channels routed to reduce common-cause damage risk

Electrical Cooling Integration

PMSM/PMG electrical losses incorporated into the machine cooling design
Converter semiconductor losses transferred to the cooling system
Converter cabinets include temperature monitoring
Thermal derating and trip logic protects electrical equipment
Cooling availability used as an electrical operating permissive
Electrical thermal loads coordinated with the V07 thermal and cooling subsystem
Battery thermal management remains a separate supplier package

Operating Control Exchanges

Torque command and torque limit
Motor and generator mode command
Speed reference and actual rotor speed
Converter ready, running and fault status
DC bus ready, voltage, current and power status
Precharge complete and main isolation status
BESS state-of-charge, state-of-health and available power limits
Grid availability and import/export limits
Cooling permissive and thermal-derating status
Emergency-stop and SIS trip signals

Electrical Load Management

Main PMSM motoring load during charge operation
PMG electrical generation during turbine operation
Active magnetic bearing system loads
Cooling-pump loads
Converter cooling loads
PLC, SIS, HMI and SCADA loads
Valve actuator loads
Instrumentation loads
Battery thermal-system interfaces
Essential and non-essential electrical loads identified through detailed design

Switchgear & Protection Engineering

Unique identification for protective devices and circuits
Protection functions coordinated with fault and selectivity studies
Breaker and switchgear ratings verified against installation fault duty
Protection interlocks coordinated across mechanical, electrical and software systems
Arc-flash and fault-containment requirements addressed through detailed study
Protection testing coordinated with factory and site acceptance procedures

Cable Engineering

Unique cable identification
Controlled source and destination references
Power, control, instrumentation and network classifications
Voltage and insulation requirements
Shielding and armour where required
Controlled routing through trays, conduits and penetrations
Ampacity and voltage-drop verification
Short-circuit withstand verification
Termination and gland control
Testing and continuity verification

Safety & Electrical Isolation

Lockable electrical service isolation
Verified stored-energy discharge before maintenance
Fail-safe response to critical electrical faults
Independent protection where required by the safety architecture
Electrical isolation coordinated with process high-pressure isolation
Safe rotor coast-down preserved during machine trips
Hazardous electrical conditions controlled through approved protection studies
Maintenance release only after verified safe electrical state

Interface Summary

General arrangement and equipment service envelopes
Three-stage compressor torque and drive requirements
Three-stage turbine generator and trip coordination
Active magnetic bearing and touchdown-bearing power requirements
Thermal and cooling subsystem
Structural skid, equipment supports and cable routes
Controls, PLC, SIS, HMI and SCADA architecture
PMSM/PMG electromagnetic design
Electrical protection, grid and earthing studies
Battery energy storage and BMS architecture
QA, inspection and commissioning systems
Safety-case and hazard-control architecture

Subsystem Documentation

Electrical Power Conversion master subsystem specification
Electrical single-line diagram
DC power-distribution documentation
Active rectifier and motor-inverter schematic
Grid inverter and transformer single-line documentation
Earthing and bonding diagram
Cable-routing and segregation documentation
Electrical load list
Cable schedule
Switchgear and protection schedule
Electrical current and thermal calculations
Factory and site acceptance records