H‑Infinity

A Power Management System (PMS) is the brain of any multi-generator plant. It automatically controls generator start/stop sequencing, load sharing, frequency and voltage regulation, and load shedding — all critical for maintaining stable power supply during grid outages, islanded operation, or when multiple generators are running in parallel.

01What is PMS Design?

PMS design encompasses the hardware, software, and integration architecture that enables automated plant control:

Automatic Sequencing

Auto-start/stop of generators based on load demand, with soft parallel operation and load sharing among running units.

Load Shedding

Under-frequency or dF/dt load shedding to prevent generator overload and ensure critical loads remain powered.

Islanding Detection

Seamless transition between grid-connected and islanded modes with automatic reconnection when grid is restored.

Monitoring & HMI

Real-time monitoring of all plant parameters, alarm management, and operator interface for manual control when needed.

02Why PMS Design Matters

Without a properly designed PMS, multi-generator plants face significant operational risks:

▸Blackout Risk — Manual start/stop sequences during emergencies are too slow, leading to complete power loss before generators come online.
▸Engine Damage — Without proper load sharing and sequencing, generators can be overloaded or run in reverse power, causing mechanical damage.
▸Fuel Waste — Inefficient generator utilisation means more units running at partial load than necessary, burning excess fuel.
▸Frequency Instability — Without load-frequency control, system frequency can swing outside safe limits (47.5–52.5 Hz for 50 Hz systems).

03Our Approach

Our PMS design follows a structured methodology from requirements to FAT:

1. Requirements Analysis

Define PMS requirements based on load profiles, generator characteristics, criticality classification, and operational procedures.

2. Control Logic Design

Develop detailed control logic diagrams, sequencer diagrams, and interlock schedules for all plant operating modes.

3. Integration Design

Design communication interfaces with generators, switchgear, protection relays, and SCADA systems using Modbus, DNP3, or IEC 61850.

4. FAT & SAT Support

Prepare FAT/SAT test procedures and support factory and site acceptance testing to verify all control functions work correctly.

04Scope of PMS Design

Our comprehensive PMS design services include:

▸PMS Hardware Specification — Controller hardware, HMI panels, communication modules, and I/O modules.
▸Control Logic & Programming — All PMS control algorithms, sequencing logic, and HMI screens.
▸Secondary Schematics — PMS panel wiring, I/O terminal diagrams, and communication network diagrams.
▸Test Procedures — Comprehensive FAT and SAT procedures for all PMS functions.

05Standards & Compliance

✓IEC 61850 — Substation Communication

✓ISO 8528 — Generator Set Performance

✓IEEE C37.94 — Parallel Generator Control

✓API 616 — Gas Turbines for Power Gen

06Why H-Infinity

We've designed PMS solutions for power plants ranging from 5 MW to 500 MW, serving industrial complexes, data centres, hospitals, and remote communities. Our team has deep expertise in generator control systems from all major manufacturers — Cummins, Caterpillar, MAN, MTU, and Wartsila — and can deliver vendor-agnostic solutions that give you operational flexibility.

Power Management System (PMS) Design