Net Load Carrying Capability of Generating Units in Power Systems

Min, Chang-Gi; Kim, Mun-Kyeom

doi:10.3390/en10081221

Cited by 13 publications

(8 citation statements)

References 33 publications

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“…Challenge categorization according to the root cause analysis. 5 Analytically, balancing challenges are addressed with the help of different concepts, such as net load or the load carrying capacity of renewables [24,71]. case, mismatches between power supply and demand.…”

Section: Tablementioning

confidence: 99%

Challenges and solution technologies for the integration of variable renewable energy sources—a review

2020

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Section: Tablementioning

confidence: 99%

Challenges and solution technologies for the integration of variable renewable energy sources—a review

2020

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“…Setting aside the practicality of the plan, large-scale integration of renewable energy resources into power systems may cause flexibility problems [2,3], where flexibility is defined as the ability to respond to changes in net load, i.e., the load subtracted from the power outputs of renewable energy resources. The National Renewable Energy Laboratory (NREL) and the North American Electric Reliability Corporation (NERC) have investigated the flexibility problem in light of the expectation that the penetration of renewable energy resources is likely to increase significantly [4,5].…”

Section: Introductionmentioning

confidence: 99%

Analyzing the Impact of Variability and Uncertainty on Power System Flexibility

Min

2019

Applied Sciences

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Featured Application: This study presents a method for separating the variability and uncertainty in a power system, and determining which is more influential in terms of flexibility, based on the flexibility index, named the ramping capability shortage probability (RSP). A process of scenario generation and sensitivity analysis is also proposed, and applied to a modified IEEE-RTS-96. The proposed method can evaluate the individual effect of variability and uncertainty and effectively provide the system operator with information that will enable more efficient operation and planning of a power system. Abstract:This study investigates the impact of variability and uncertainty on the flexibility of a power system. The variability and uncertainty make it harder to maintain the balance between load and generation. However, most existing studies on flexibility evaluation have not distinguished between the effects of variability and uncertainty. The countermeasures to address variability and uncertainty differ; thus, applying strategies individually tailored to variability and uncertainty is helpful for more efficient operation and planning of a power system. The first contribution of this study is in separating the variability and uncertainty, and determining which is more influential in terms of flexibility in specific system situations. A flexibility index, named the ramping capability shortage probability (RSP), is used to quantify the extent to which the variability and uncertainty affect the flexibility. The second contribution is to generate various scenarios for variability and uncertainty based on a modified IEEE-RTS-96, to evaluate the flexibility. The penetration level of renewable energy resources is kept the same in each scenario. The results of a sensitivity analysis show that variability is more effective than uncertainty for high and medium net loads.

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“…Moreover, the distributed generators, electric vehicles, energy storages and so forth on the load side increase the uncertainties of the system as well. Hence, researchers introduced the concept of net load [7,8]. The net load means of the system in the premise that the economy of the system is ensured.…”

Section: Introductionmentioning

confidence: 99%

Sample Entropy Based Net Load Tracing Dispatch of New Energy Power System

Peng

Gao

et al. 2019

Energies

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The high-proportion of renewable energies is gradually becoming one of the main power supply sources and bringing strong uncertainties to the power grid. In this paper, a sample entropy (SampEn) based net load tracing dispatch strategy with a specific thermal generating mode is proposed. In this strategy, renewable energies are fully and preferentially consumed by electric loads, turned to net loads, to maximize the utilization of renewable energies. SampEn theory is utilized to evaluate the complexity of net load time series, based on which, the traditional power generators trace the complexity of the net load flexibly. According to the SampEn, a specific generating model of thermal generators is determined and the cooperation between thermal generators and pumped storage is realized, aiming at reducing the ramp power of thermal generators and increasing the throughput of pumped storage. The experiment simulation is developed on the 10-unit test system. Results show that the ramping power of the thermal generators are reduced 43% and 13% in the two cases together with the throughput of pumped storage is increased 44% and 27% on the premise that the economy of the system is maintained and renewable energies are fully consumed. Therefore, the efficiency and reasonability of the proposed dispatch strategy are confirmed.Energies 2019, 12, 193 2 of 23 the imbalance between electric loads and intermittent power energies. In this way, the source-load bilateral uncertainty problem is transformed to how to respond to the uncertainty of net loads.There are many studies focusing on the power balancing problems related to high-proportion renewable energies connected to the power grid. The multi-source coordination of power systems is an effective means. The flexible resources such as hydropower plant, gas turbine power plant, energy storage, and so forth are developed and utilized to respond to the uncertainty and fluctuation of renewable energies cooperatively [9,10]. In [10], a robust unit commitment model considering the cooperation of wind power and pumped storage is proposed, in which the wind power fluctuation is restrained by the pumped storage. Reference [11] utilized the second life battery energy storage to assist thermal generators to respond to the fluctuation of renewable energies. Facing the high-percentage renewable energies, the ramp capability of generators is an important factor when to response to the load demands [12][13][14]. It is argued in [15] that the insufficient ramp resources in the system may lead to the insufficient flexibility to meet variations in the net loads. Reference [16] estimated the potential variability of net loads by the statistical approaches on the ramping characteristics to determine the required ramping capability in the future. The increasing ramping capability can improve the flexibility on supply side. However, the above studies are based on the traditional power dispatch. With the increasing of renewable energies percentage, the amplitude and frequency of generating and ram...

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Net Load Carrying Capability of Generating Units in Power Systems

Cited by 13 publications

References 33 publications

Challenges and solution technologies for the integration of variable renewable energy sources—a review

Challenges and solution technologies for the integration of variable renewable energy sources—a review

Analyzing the Impact of Variability and Uncertainty on Power System Flexibility

Sample Entropy Based Net Load Tracing Dispatch of New Energy Power System

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