Analysis And Optimization Of Hydro-photovoltaic Renewable Energy System In Sichuan Province Based On EnergyPLAN Model

Sichuan Province has a high proportion of clean energy inputs.However,the rapid development of power supply construction and the slowdown in the growth of provincial electricity demand have led to an imbalance in the power grid,and the difficulties in sending hydropower to the outside have led to increasingly serious abandonment of hydropower,which in turn reduces the efficiency of power system utilization.This paper therefore optimises the supply-side structure of the power system in Sichuan Province with the support and guidance of the National Key R&D Programme project "Distributed Photovoltaic and Tertiary Small Hydropower Complementary Cobined Generation Technology and Application Demonstration"(2018YFB0905200).The energy structure of various sectors in Sichuan Province is analyzed to achieve a clean and low-carbon energy system based on maintaining the stability of the power system using hydro-PV-wind-storage complementarity.The study is divided into three main parts:(1)The research simulates and analyzes the current(2017)Sichuan energy system.2017 is selected as the reference year to construct a reference year energy analysis model to accurately simulate the energy system of Sichuan Province.The current absorption capacity of new energy sources such as hydropower,wind and solar in Sichuan Province,as well as the carbon dioxide emissions of the power,industry,and transportation sectors are analyzed.(2)This research assesses the response of Sichuan’s energy system to different hydropower levels in the medium term(2030).In accordance with current technology development trends and policy requirements,the policy analysis models of Sichuan energy system are constructed.According to different hydropower generation capacity indexes,the policy models of different scenarios in 2030 are divided into three scenarios to conduct multiple analyses of power structure,supply and demand balance,new energy consumption capacity,and environmental/economic benefits.According to the power shortage phenomenon in different scenarios,the renewable energy consumption capacity are studied.(3)This research proposes a variety of long-term(2050)Sichuan energy system structure optimization schemes.Based on a series of supply and demand forecasts,clean energy/electric substitution hypotheses,multiple energy optimization models under different hydropower scenarios are constructed respectively.Through the comparison of technical advantages and environmental benefits,it is verified that the energy storage system and multi-energy complementary technology are excellent in maintaining the stability of the power system and improving the ability to intergrate renewable energy.Comparing the costs of different models and scenarios,the research finally obtains an optimized structure of renewable energy that can effectively improve the capacity of renewable energy consumption,solve the problem of surplus water and power,achieve the goal of "carbon neutrality",and reduce the cost of power construction.This optimized structure has important theoretical significance and application value for the clean transformation of Sichuan’s mid-and long-term energy system and the efficient use of energy.