Abstract
Aiming at the problem of insufficient peak shaving capacity of the power system after large-scale renewable energy such as wind power and photovoltaics is connected to the grid, a new energy-pumped storage combined system low-carbon economic operation strategy is proposed. First, the energy storage characteristics of pumped storage are studied; wind power and photovoltaic output are shifted in time and space; and a new energy-pumped storage combined system model with photovoltaics, wind power, and pumped storage as the main body is established. Second, the carbon trading mechanism was introduced, and the reward and punishment ladder carbon trading cost model was established. Then, via the new energy-pumped storage combined system, the upper optimization target with the smallest investment cost and the lower optimization target with the largest system benefit are established, and a two-layer optimization model solution method based on linearly decreasing inertia weight particle swarm optimization and sequential quadratic programming algorithm is proposed. Finally, via the operating data of a pumped storage power station on an island in northern China, the new energy-pumped storage combined system low-carbon economic operation strategy was simulated and verified. The simulation results show that the low-carbon economic operation strategy of the new energy-pumped storage combined system proposed in this paper can effectively suppress load fluctuations, reduce the impact of wind and wind anti-peak regulation characteristics on the power grid, increase the utilization rate of renewable energy, and improve system economy.
Highlights
With the national low-carbon strategy and policy support, a high proportion of wind power, photovoltaics, and other renewable energies has been connected to the power system. e volatility of wind power output and the characteristics of anti-peak regulation have brought great challenges to the peak regulation of the power system [1,2,3]
Wind power, photovoltaics, and pumped storage are clean power generation methods that have low-carbon emissions during production and operation, but the system’s component production, operation and maintenance, and recycling processes have relatively large carbon emissions, which are related to renewable energy-pumping. e optimal configuration of the energy storage combined system has a greater impact and cannot be ignored. erefore, by combining the constraints of the carbon trading mechanism on carbon emissions, establishing a joint operation mode of wind power, photovoltaics, and pumped storage has the advantages of reducing system peak shaving costs, reducing deep peak shaving of thermal power units, stabilizing load fluctuations, and promoting the consumption of renewable energy
Mathematical Problems in Engineering e pumped storage power station participates in the joint operation of wind and wind electric fields to smooth wind and wind power as a flexible resource
Summary
With the national low-carbon strategy and policy support, a high proportion of wind power, photovoltaics, and other renewable energies has been connected to the power system. e volatility of wind power output and the characteristics of anti-peak regulation have brought great challenges to the peak regulation of the power system [1,2,3]. Erefore, by combining the constraints of the carbon trading mechanism on carbon emissions, establishing a joint operation mode of wind power, photovoltaics, and pumped storage has the advantages of reducing system peak shaving costs, reducing deep peak shaving of thermal power units, stabilizing load fluctuations, and promoting the consumption of renewable energy. Via the operating data of a pumped storage power station on an island in northern China, simulation verification of the low-carbon economic operation strategy of the new energy-pumped storage combined system was conducted to verify the effectiveness of the proposed model and method. Rough the coordination and optimization of the new energy-pumped storage combined system, the originally fluctuating wind and photovoltaic power generation becomes a stable and dispatchable multisource energy storage system, realizing peak shifting and staggering valleys. In the formula, W(t) is the remaining water volume of the upper reservoir at time t; Qrain(t) is the increased flow of rainfall in the upper reservoir; Δt is the time interval; Qp(t) and Qh(t) are the flow of pumped storage in the pumping state and the power generation state, respectively; ηp and ηh are, respectively, reversible water pump-turbine unit storage efficiency and power generation efficiency; ηwp is the pipeline efficiency; Pp(t) and Ph(t) are the storage power and generation power of the reversible water pumpturbine unit, respectively; ρ is the density of water; g is the acceleration of gravity; h is the height of the head; and Kp and Kh are the flow-to-power ratios of pumped storage in the pumping state and the power generation state, respectively
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