Cases-GoLead Intelligent

A Ultra-Supercritical Coal-Fired Power Plant of Shenergy Group

Overview

This ultra-supercritical coal-fired power plant adopts the world’s first high- and low-level arranged, dual-shaft secondary reheat ultra-supercritical generator technology, representing the largest single-unit coal-fired generating unit in operation worldwide, with a unit capacity of 1,350 MW.

In practical operation, given the ultra-supercritical, large-capacity unit characteristics, reactive power disturbances during grid synchronization must be carefully managed. For the 1,350 MW dual-shaft secondary reheat unit, a slip-frequency synchronizing prediction algorithm is applied, ensuring a fast, reliable, and stable grid-connection process. In addition, smart mode identification supports no-voltage check and double-sided live closing, reducing the risk of boiler flameout and achieving a grid-connection success rate exceeding 99.9%.

Pain Points & Solutions

Pain Point 1: Grid-Connection Impact of Large-Capacity Units Affecting Boiler Stability

Inrush currents at the moment of grid connection may cause boiler pressure fluctuations, potentially leading to unplanned shutdowns.
Solution 1

Precisely controls the synchronizing point to reduce reverse power during grid connection, ensuring safe and stable synchronization.
Pain Point 2: Complex On-Site Synchronization Requirements

Some synchronizing points may operate under slip-frequency conditions, while others require equal-frequency synchronization. In addition, support is required for single-side and double-side no-voltage closing checks.
Solution 2

The automatic synchronizing device supports self-identification of synchronization conditions and automatic determination of multiple closing modes.
Pain Point 3: Extremely High Requirements for Reliability and Availability

The generator synchronizing system must achieve exceptionally high reliability and availability to ensure proper operation under both normal and fault conditions.
Solution 3

The synchronizing control system adopts multiple redundancy designs, ensuring that remaining redundant systems continue to operate normally in the event of one or more system failures.

Values

Simple & Flexible

Supports grid connection and line synchronization of generators under various operating conditions.
Economical & Safe

Significantly reduces boiler pressure fluctuations during grid connection, preventing unplanned shutdowns.

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