Multi-Angle Economic Analysis of Coal-Fired Units with Plasma Ignition and Oil Injection during Deep Peak Shaving in China

Abstract

What China committed in the Paris Agreement encourages the penetration of renewable energy in power grid. To consume more renewable energy, coal-fired units undertake the most part of peak shaving task and are usually operated at a low-load level during off-peak hours. However, deep peak shaving has harmed the benefits of thermal power plants and also brought about environmental problems. To improve the peak-shaving capacity and operation efficiency of coal-fired units, the government encourages the flexibility retrofits for coal-fired units. In this paper, peak-shaving related cost functions are proposed for the multi-angle economic analysis of coal-fired unit with plasma ignition (UPI) and oil injection (UOI), respectively. First, the operation characteristic is analyzed for three stages of peak shaving, and then the peak-shaving costs related to these three stages are proposed in terms of the coal consumption cost, wear-and-tear cost, combustion-supporting cost, and environmental cost. Afterwards, a peak-shaving cost-based economic dispatch model is presented with consideration of the curtailed wind penalty, and an environmental efficiency index is defined to evaluate the environmental benefits. Finally, in the case study, quantitative economy analysis is performed from the aspects of thermal power plants, wind power plants, and the environment separately, and the simulation results indicate that UPI has better peak-shaving economy and environmental efficiency than UOI.

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“…The peak shaving state of the unit is divided into conventional peak shaving and deep peak shaving. When the active power output of the unit falls below a certain threshold, the unit enters the deep peak shaving state, and the peak shaving cost will increase sharply [45,46]. This paper supposes that the peak shaving cost is a linear function of the peak shaving depth.…”

“…The annual peak shaving cost (APSC) of power generation technology repres equivalent cost incurred by the generator to reduce its own power generation through some technical means when there is a demand for peak shaving at the g This cost includes the operating cost of making the unit lower than the rated outp the potential risk cost caused by the unit being in a peak shaving state. The peak state of the unit is divided into conventional peak shaving and deep peak shaving the active power output of the unit falls below a certain threshold, the unit enters t peak shaving state, and the peak shaving cost will increase sharply [45,46]. Thi supposes that the peak shaving cost is a linear function of the peak shaving depth bined with the definition of CCI in Section 2.1, the APSC is expressed as a piecewis function of CCI.…”

Stochastic Economic Dispatch of Hydro-Thermal-Wind-Photovoltaic Power System Considering Mixed Coal-Blending Combustion

“…[12] gave an effective sizing strategy for a distributed battery energy storage system in the distribution networks with high photovoltaic penetration levels, which also analyzed the corresponding cost-benefit. Furthermore, for improving the peak-shaving capacities and operational efficiencies for coal-fired units, the cost function related with DPRO was presented for the multi-angle economic analysis of those units with plasma ignition and oil injection [13]. Nevertheless, these studies had not considered the influence of coal quality on the economy and environmental conservation of power system.…”

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