Optimal Generation Expansion Planning Model of a Combined Thermal-wind-PV Power System Considering Multiple Boundary Conditions: A Case Study in Xinjiang, China

Abstract

Background The scarcity of fossil fuels and their high emissions impact on the environment have forced the rapid development of renewable energy. Wind and photovoltaic power play a more and more important role in today's power system because of their clean and renewable characteristics. However, with the large-scale grid connection of wind and photovoltaic power, the contradiction between renewable energy and thermal power is becoming more and more serious. The unreasonable planning of power generation resources has also caused a lot of waste of electric power.Methods To solve this problem, this paper comprehensively considers the construction and operation costs of power plants, and constructs an optimal generation expansion planning model of a combined thermal-wind-PV power system with the objective of minimizing total cost. The planning is calculated under the boundary conditions of ensuring the safe operation of the power grid and taking into account the share requirement, utilization requirements and construction requirements for renewable energy. The model is applied to the self-use and external power plants in Xinjiang.Results The results show that this generation expansion plan can reduce the total cost of the power plants while ensuring the load demand. The renewable energy has also received more consumption share and its abandonment rate has dropped significantly. Numerical examples show that the optimization model has good applicability.Conclusion The proposed optimization model can realize the coordinated development of three types of power sources under multiple boundary conditions, which can not only guarantee the economy of power construction, but also take into account the optimization of environmental benefits. Reasonable generation expansion planning can improve energy efficiency, achieve clean and low carbon in the process of power generation, and promote the sustainable development of society.

Optimal planning of Renewable energy generators in modern power grid for enhanced system inertia

“…Equations ( 34) and ( 35) constraint the active power of the thermal power plants by its ramp rate limits. Equation (34) gives the ramp down limit, while Eq. ( 35) gives the ramp up limit.…”

“…Equation (48) constraints the total power generation from RES using the flexible parameter fl, which is given as a fraction of the total load demand. Equation (49) limits the total power generation from thermal generators to at most (1-fl) percent of total load demand [34]. Equation (50) defines the range of values of the flexible parameter, fl, which is used to confine the RES penetration level to be between 33 and 100% of the total load demand.…”