Abstract
The balance of electric power and energy is important for designing power stations’ load distribution, capacity allocation, and future operation plans, and is thus of vital significance for power design and planning departments. In this paper, we analyzed the correlation between the output fluctuations of power stations and the load fluctuations of the power system in order to study the load change of the power system within a year/month/day, and the output variation amongst the power stations in operation. Reducing the output of hydropower stations or increasing the output of thermal power stations (TPS) could keep the monthly adjustment coefficient of the power system within a certain range, and thus balance the power system’s electric power and energy. The method for calculating the balance of electric power and energy of TPS is also improved. The nested-structured load shedding method (NSLSM), which is based on the calculation principle of the load shedding method, is put forward to iteratively calculate the peak shaving capacity and non-peak shaving capacity of every single thermal power station. In this way, the output process of each thermal power station can be obtained. According to the results and analysis of an example, the proposed methods of calculating monthly adjustment coefficients and the balance of electric power and energy of a thermal power station are validated in terms of correctness, feasibility, and effectiveness.
Highlights
The balance of electric power and energy is one of the important calculations in the planning and design of power grids, as well as in forecasting the schedule and operation of future power systems [1,2,3]
This paper aims to solve the problem of how to allocate the installed capacity and generated energy of power stations in both the planning/design stage and the operation phase, according to the predicted load demand of the power system
By applying the improved load shedding method (ILSM) combined with the iterative idea of a nested structure, the working capacity of a single thermal power station is divided into peak shaving capacity and non-peak shaving capacity, which are separately calculated to eventually produce the whole output process of the power station
Summary
The balance of electric power and energy is one of the important calculations in the planning and design of power grids, as well as in forecasting the schedule and operation of future power systems [1,2,3]. The plotting method [6], for instance, moves the accumulative electricity curve of a power station along the horizontal and vertical directions on a daily load chart of the power system according to the station’s daily generated energy and maximum working capacity, respectively. By this means, the working position of the power station on the daily load chart can be pinned down, and its daily output process can be obtained. By applying the ILSM combined with the iterative idea of a nested structure, the working capacity of a single thermal power station is divided into peak shaving capacity and non-peak shaving capacity, which are separately calculated to eventually produce the whole output process of the power station
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