Thermal power hydropower and energy storage ramp rate

What is the equivalent ramp rate function for thermal power systems?

Conventionally, the equivalent ramp rate for the equivalent thermal unit is the summation of each unit’s ramp rate. However, the equivalent ramp rate relies heavily on the operating points of each thermal unit. In this paper, a concept termed the equivalent ramp rate function (ERRF) for thermal power systems is proposed.

Do thermal units' operating points affect system-wide ramp rates?

Given the principle of dispatch such as cost minimization, the impact of thermal units’ operating points on the system-wide ramp rate can be accurately considered. Case studies reveal that the proposed ERRF can better reflect the system-wide ramp rates. Rest of the paper is organized as follows.

How does thermal system output affect system-wide ramp-up rate?

With the increase of thermal system output, some units may reach their full capacity earlier than others. These binding generating units cannot provide ramp-up capability for system operations. Therefore, the system-wide ramp-up rate would decrease with the increase of the thermal system output.

What is system-wide ramp rate?

Conventionally, the system-wide ramp rate is the summation of the units’ ramp rates . However, the ramp rate relies heavily on the operating points of thermal units. The simply summation of the units’ ramp rates may produce inaccurate results. Therefore, there is still a need to investigate the modeling technique for system-wide ramp rates.

What are the applications of ramp rate function?

The proposed ramp rate function can be applied in wind integration study, hydro-thermal coordination, multi-area economic dispatch, and etc. The economic dispatch model without network constraints is utilized in this paper to formulate the ERRF.

Can a thermal power system be simplified into an equivalent thermal unit?

The thermal power system can be simplified into an equivalent thermal unit in the studies where the performance of individual units is not the focus. Conventionally, the equivalent ramp rate for the equivalent thermal unit is the summation of each unit’s ramp rate. However, the equivalent ramp rate relies heavily on the operating points of