Variable-speed technology used in power plants for better plant economics and grid stability

The objective of this research is to simultaneously reduce energy requirements along with rapid and broad load ranges using variable-speed pumps (VSPs) in thermal power plants. This paper proposes a novel algorithm to calculate the operating points of VSP. A case study on the operation optimization of condenser cooling water pump shows that VSP is far superior to fixed-speed pump in terms of energy savings. Vacuum adjustment system is established to improve the capability of thermal power plants in executing rapid load changes. The authors also bring forth a proposal to establish an automatic variable-speed control system to ensure safety, economy, and stability of the units and grid operations.