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Integrated variable renewable energy presents a flexibility requirement for power system operation, as depicted in Fig. 1.The graph in Fig. 1 illustrates three curves, where the blue curve represents the total load demands, the yellow curve indicates the net load, produced by subtracting the curve of renewable energy generation from the total
FAN ET AL. 605 the value of demand response resources and storage capacity, and establishes a power planning model that integrates thermal power, renewable energy, storage, and demand-side response. Reference [16] developed a scenario-based stochastic
After the thermal demand is met, the remaining thermal energy is stored in the thermal storage (such as 10:00 on sunny and cloudy day) and released at the peak thermal load hours (18:00–20:00 on sunny day and around 18:00 on
The anti-peaking characteristics of a high proportion of new energy sources intensify the peak shaving pressure on systems. Carbon capture power plants, as low-carbon and flexible resources, could be beneficial in peak shaving applications. This paper explores the role of carbon capture devices in terms of peak shaving, valley filling,
Chloride molten salt is the most promising thermal energy storage materials for the next generation concentrated solar power (CSP) plants. In this work, to enhance the thermal performance of KNaCl 2 molten salts, composited thermal energy storage (CTES) materials based on amorphous SiO 2 nanoparticles and KNaCl 2 were
The on-grid price for both the thermal power plant and PV power generation is 547 yuan/MWh. The penalty for solar energy curtailment is 280 yuan/MWh ( Cui et al., 2021 ). The carbon trading cost is 100 yuan/t, with an emission reduction factor of 0.7 ( Cui et al., 2021 ).
Maintaining frequency stability is a prerequisite to ensure safe and reliable operation of the power grid. Based on the purpose of improving the frequency regulation performance of the power grid and efficiently utilizing the frequency regulation resources, a improved particle swarm optimization-based thermal power-energy storage combined automatic power
Solar thermal power generation technology is an environment-friendly power generation technology that can make full use of solar energy. The power generating model and economical model of the concentrating solar power (CSP) station are established in this paper. The reliability of the power generation system is calculated based on the
LI Junhui, ZHANG Jiahui, MU Gang, GE Yanfeng, YAN Gangui, SHI Songjie, "Hierarchical Optimization Scheduling of Deep Peak Shaving for Energy-storage Auxiliary Thermal Power Generating Units
To further improve the peak regulation capability, the integration of the CSP plant with EH is proposed to actively join the power system operation. EH can convert electric energy into heat energy through the Joule effect (He et al., 2021).The excess power from wind
Integration of energy storage infrastructures into electrical grids represents a crucial milestone in the transition towards energy systems with high penetration of
In order to alleviate the peak regulation pressure of thermal power units, a comprehensive evaluation index of peak regulation adequacy and an energy storage power station
Coal-fired power plant coupled with thermal energy storage has been proposed to enhance the flexibility of CFPPs before 1990 [19], [20]. Molten salt is directly heated by fossil fuel during charging. Levelized energy cost is
Coupling energy storage system is one of the potential ways to improve the peak regulation and frequency modulation performance for the existing
The transition to renewable energy production is imperative for achieving the low-carbon goal. However, the current lack of peak shaving capacity and poor flexibility of coal-fired units hinders the large-scale consumption of
Thermal power unit coupled with ejector and thermal energy storage both technically and economically Phase change heat exchangers, medium and low-pressure turbines are key to exergy loss. Maximum cycle efficiency of 70–80 % and peak-valley regulation rate of 16.5 % and 11.7 % were obtained.
To enlarge the regulation capacity of the power system, some thermal power plants have a specially built energy storage system for peak regulation. However, building energy storage systems speci on the side fically of thermal power plants has a relatively high
2.1.2. The impact of thermal energy storage and/or electric heat pump on feasible operating region of the combined heat and power plant This section indicates the peak shaving mechanisms of TES, EHP and their combination by a graphical analysis method. The
Different energy storage utilization methods of thermal power units vary in terms of time response scale, economic impact, and load regulation depth. Although employing a specific energy storage utilization scheme can contribute to the improvement of load regulation, it does not maximize the energy storage utilization of the unit.
1 INTRODUCTION In China, the installed capacity for renewable energy, such as wind and solar power, has grown rapidly in recent years. At the end of 2018, the total installed capacity of wind and solar power in
Peak regulation of oil-fired thermal power units can be divided into three stages [], namely regular peak regulation Li P, Yu X, Zhou Q, et al (2022) Multi-source low-carbon peak-shaving transaction optimization model for thermal power-energy storage-demand
As a peak regulation power source, the SPT plant has more excellent peak shaving ability than the coal power plant. Therefore, the thermal stress generated in the power cycle system is obvious, especially during the start-up, shut down, and operating under variable conditions.
The simulation example shows that the virtual power plant and its day-ahead and intra-day optimal peak regulation strategy can reduce the peak regulation
Operation mechanism of VPP participating in the energy market In a Virtual Power Plant (VPP), common aggregated members include small-scale thermal power units, micro gas turbines, distributed solar and wind farms, and energy storage stations, among
Liquid air energy storage is used for load regulation of thermal power plants. • The novel integrated system eliminates the use of heat transfer oil. • The comprehensive efficiency of the integrated system is improved by 1 %. • The levelized cost of storage is reduced
The requirement for primary frequency regulation (PFR) capability of thermal power plants (TPPs) in power systems with larger penetration of renewable energy resources (RESs) is higher since the RESs contribute less to PFR compared with TPPs. To ensure the system frequency stability, this paper proposes to enhance the PFR capability of TPPs through
Second, by combining the AHP and the entropy method, the combined weights of the indicators are determined by establishing a conformity model of the weighted attribute values. The optimization model is formulated as follows. (1) min L = ∑ j = 1 m ∑ i = 1 n a 1 w i 1 x ij − a 2 w i 2 x ij 2 s. t a 1 a 2 ≥ 0, a 1 + a 2 = 1 where x ij denotes the normalized value
The SPT station is composed of multiple subsystems, including that of solar concentrating system, heat absorption system, steam generation system (SGS), thermal energy storage system, power generation system, etc., as shown in Fig. 1 which is a process schematic of molten salt SPT in TRNSYS platform.
Within the realm of energy storage methods, molten salt TES stands out as a promising approach for regulating the peak performance of thermal power units.
Most combined heat and power plants in northern China are mainly used as heat sources for central heating systems. To improve the electricity regulation ability and evaluate objectively, this study establishes an evaluation method of cogeneration peak shaving which reflects the marginal cost of power generation in the valley and the peak
A concentrating solar power (CSP) plant with a high-capacity thermal storage system (TES) is a utilization form of solar energy (Zhang et al., 2022). TES can store heat energy efficiently. The photoelectric decoupling characteristics provide the CSP plant with the capacity to control the output.
Aiming at the peak regulation and spinning reserve demand in the power system, the dual peak regulation and spinning reserve ability of the CSP plant
Abstract: The requirement for primary frequency regulation (PFR) capability of thermal power plants (TPPs) in power systems with larger penetration of renewable energy
This method comprehensively considers the frequency regulation output characteristics of thermal power units and energy storage systems, the operating characteristics and
Previous studies have mainly focused on the static techno-economic evaluation of coal-fired power plant retrofit options without considering the optimal allocation of flexibility resources and power
Concentrating solar power (CSP) is a promising renewable and sustainable energy technology [1]. The integration of CSP with thermal storage systems can address the shortcomings of low renewable
Yu (2019) designed thermal power units for a wind-PV-CSP system, explored the best TES capacity configuration scheme, and looked at the impact of solar collecting system size on TES capacity planning
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