Power Management Systems & Fast Load Shedding

What this covers

• Dynamic contingency calculation — continuous comparison of spinning reserve against operating load, so the shedding table reflects the plant's actual running configuration.
• Fast load shedding — priority-table feeder tripping executed within roughly 50 to 80 ms of the trigger event.
• Under-frequency and under-voltage staged shedding as the fallback layer when fast shedding is insufficient or unavailable.
• Active and reactive power sharing — dispatch to generator governors and AVRs to balance load and hold bus voltage.
• Redundant architecture — S7-1500H redundant CPUs with ET 200SP distributed I/O over fault-tolerant Profinet (MRP) rings.
• Interaction with protection — defining which protection trips initiate shedding and, just as importantly, which must not.

What you receive

• Functional Design Specification stating the shedding algorithm, trigger criteria and contingency tables
• Redundant PLC control code with the priority matrix documented
• Factory Acceptance Test protocol with contingency test scripts per scenario
• Operator interface for reserve status, shed priority and event history

Standards and references

Contingency cases are derived from load flow and stability studies prepared to IEEE 399 and IEEE 1110, with control logic to IEC 61131-3 and redundant Ethernet to IEC 62439 (MRP).