Frequency-based method for fast-response reserve dispatch in isolated power systems

Wu, Chao‐Ming; Chen, N.

doi:10.1049/ip-gtd:20040028

Cited by 23 publications

(15 citation statements)

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“…The system frequency is more susceptible to load changes when a system is under a light load. The system frequency is less affected by load changes when a system is under a heavy load [23][24][25][26][27][28]. Because power system load implies a certain level of inherent uncertainty, errors or distortions in the load forecasting are common.…”

Section: Determining the Load-frequency Sensitivity Factor (Lfsf)mentioning

confidence: 99%

Experimental Research and Control Strategy of Pumped Storage Units Dispatching in the Taiwan Power System Considering Transmission Line Limits

Kuo

2013

Energies

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Taiwan's power system is isolated and not supported by other interconnected systems. Consequently, the system frequency immediately reflects changes in the system loads. Pumped storage units are crucial for controlling power frequency. These units provide main or auxiliary capacities, reducing the allocation of frequency-regulating reserve (FRR) and further reducing generation costs in system operations. Taiwan's Longmen Nuclear Power Plant is set to be converted for commercial operations, which will significantly alter the spinning reserves in the power system. Thus, this study proposes a safe and economic pumped storage unit dispatch strategy. This strategy is used to determine the optimal FRR capacity and 1-min recovery frequency in a generator failure occurrence at the Longmen Power Plant. In addition, this study considered transmission capacity constraints and conducted power flow analysis of the power systems in Northern, Central, and Southern Taiwan. The results indicated that, in the event of a failure at Longmen Power Plant, the proposed strategy can not only recover the system frequency to an acceptable range to prevent underfrequency load-shedding, but can also mitigate transmission line overloading.

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Section: Determining the Load-frequency Sensitivity Factor (Lfsf)mentioning

confidence: 99%

Experimental Research and Control Strategy of Pumped Storage Units Dispatching in the Taiwan Power System Considering Transmission Line Limits

Kuo

2013

Energies

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“…In the formulation, only the kinetic energy supplied from the units is deemed dispatchable, and therefore, it must be separated from in the constraint. For a maximum allowable Rocof of 0.25 Hz/s, the constraint is formulated as follows: (11) where is the set of generators, and is the kinetic energy supplied from the load. It can be seen that the Rocof constraint is inherently linear and can be expressed in terms of the control variables.…”

Section: A Rocof Constraintmentioning

confidence: 99%

“…Some developed electricity markets use linear programming (LP) dispatch algorithms to co-optimize energy and reserves as a means to ensure system reliability in a least-cost manner [8]- [10]. Work based on the Taiwan power system [11] and work based on the Republic of Ireland power system [12] use system frequency models to examine the behavior of the systems after the loss of large units. The amount of reserve carried by the systems is assessed to see if it is sufficient to meet the systems' frequency criteria.…”

Section: Introductionmentioning

confidence: 99%

Frequency Control in Competitive Electricity Market Dispatch

Doherty

Lalor

O’Malley

2005

IEEE Trans. Power Syst.

120

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The dynamic and inertial characteristics of electricity systems are evolving with consequences for system frequency control. This issue is particularly important for smaller, more isolated electricity systems, where simple heuristic reserve targets may no longer be sufficient to ensure the security of the system. In a market environment, this issue needs to be dealt with in a systematic way that is compatible with the method of market dispatch to ensure least-cost operation of the system. This paper describes how frequency control constraints can be derived and included into a market dispatch algorithm. Comparisons are made with a conventional reserve target dispatch approach for a real isolated power system. The impact on market prices, cost, and the number and size of problem contingencies is assessed. The effect of increasing amounts of wind capacity is also examined.Index Terms-Frequency control, linear programming (LP), power generation dispatch, power system security.

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“…However, this method does not reflect the ongoing system condition that may change the reserve requirement. Alternatively, some scheduling methods based on the statistical analysis of the frequency characteristic on the load were proposed [13]. When the regulating reserve is considered to be partial of the contingency reserve, however, this method lacks frequency response information to ensure frequency security.…”

Section: Introductionmentioning

confidence: 99%

“…When the regulating reserve is considered to be partial of the contingency reserve, however, this method lacks frequency response information to ensure frequency security. Alternatively, some scheduling methods based on the statistical analysis of the frequency characteristic on the load were proposed [13]. Although these methods have taken the frequency response into account, the reserve adjustment is still based on the historical data which are collected from the limited frequency events.…”

Section: Introductionmentioning

confidence: 99%

Adaptive regulating reserve scheduling for the isolated power system

Chang-Chien

Chien

2011

Int Trans Elec Energy Syst

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SUMMARY Regulating reserve is generally deployed to support system frequency. Because the moment‐to‐moment load fluctuations require continuous frequency control, allocating the reserve for this kind should be flexible to support the function of automatic generation control. Because fast response units not only are assigned to support automatic generation control but also are utilized to deal with credible frequency events, the regulating reserve may be planned as a portion of contingency reserve for security concern, especially for an isolated power system. Without inter‐tie to mutually support system frequency, frequency of an isolated system is much more sensitive to the disturbances than that in the interconnection. Therefore, the scheduling of regulating reserve for an isolated system should be more cautious to take both security and economy into account. This paper describes a methodology that adaptively schedules the regulating reserve based on the dynamic security margin as well as the ongoing demand of the system. Compared with the conventional way of using the historical data, the proposed scheduling method is proven to be more capable of dealing with the change of system condition and furthermore potentially reducing the extraneous reserve. More operational cases will be presented to show the merits of the proposed method that is applied to the ancillary service market. Copyright © 2011 John Wiley & Sons, Ltd.

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Frequency-based method for fast-response reserve dispatch in isolated power systems

Cited by 23 publications

References 10 publications

Experimental Research and Control Strategy of Pumped Storage Units Dispatching in the Taiwan Power System Considering Transmission Line Limits

Experimental Research and Control Strategy of Pumped Storage Units Dispatching in the Taiwan Power System Considering Transmission Line Limits

Frequency Control in Competitive Electricity Market Dispatch

Adaptive regulating reserve scheduling for the isolated power system

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