Management and dynamic performances of combined cycle power plants during parallel and islanding operation

Bagnasco, Andrea; Delfino, B.; Denegri, G.B.; Massucco, S.

doi:10.1109/60.678985

Cited by 54 publications

(12 citation statements)

References 7 publications

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“…The dynamic response characteristics of gas turbines during frequency decrease events are well established in the published literature [10][11][12]. During frequency decrease events gas turbine (both the CCGT and OCGT) power output decreases because of the reduction in pressure ratio across the gas turbine.…”

Section: Introductionmentioning

confidence: 98%

Characterisation of gas turbine dynamics during frequency excursions in power networks

Meegahapola

2014

IET Generation, Transmission & Distribution

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Gas turbines inherently depict unique frequency response characteristics compared with other conventional synchronous generation technologies as their active power output is not entirely determined by the governor response during frequency deviations of the power network. Thus, gas turbine dynamics significantly influence on system stability during frequency events in power networks. Power system and power plant operators require improved understanding of the gas turbine characteristics during various frequency events in order to mitigate adverse impact on power system. Therefore a comparative analysis has been performed between combined-cycle gas turbines (CCGTs) and open-cycle gas turbines (OCGTs) in order to characterise the dynamic behaviour considering different types of frequency events in power networks. Study has shown that CCGTs result in significant frequency variations in power networks in comparison with OCGTs because of the temperature control action performed by the fast acting inlet guide vanes at the combustor. In particular, they are susceptible to lean blowout during large frequency increase events such as short-circuit faults in power networks. Furthermore, a case study was developed based on the New England-39 bus system in order to illustrate the impact of gas turbine dynamics on network frequency during short-circuit events in power networks.

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Section: Introductionmentioning

confidence: 98%

Characterisation of gas turbine dynamics during frequency excursions in power networks

Meegahapola

2014

IET Generation, Transmission & Distribution

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“…The high-and lowpressure models are represented by weight factors in the power generation as suggested by Carneiro (2007); these weight factors are defi ned according to the experimental data, as well as the steam transport delays. Bagnasco et al (1998) developed a simplifi ed model for HRSG. Th e model considers HRSG delays for heat transfer and heat storage and is represented by transfer functions as can be seen in Fig.…”

Section: Combined Cycle Modelingmentioning

confidence: 99%

“…The Heat Recovery Steam Generator (HRSG) model was based on Bagnasco et al (1998) and the ST model, on Carneiro (2007). To achieve a representative model, a set of performance parameters was collected from the power plant operational data.…”

Section: Combined Cycle Modelingmentioning

confidence: 99%

Combined Cycle Performance Evaluation and Dynamic Response Simulation

Mattos

Bringhenti

Cavalca

et al. 2016

J.Aerosp. Technol. Manag.

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Power plants operating in combined cycle present higher thermal efficiency (over 60%) and increased power generation when compared to traditional simple cycles, such as gas or steam turbines operating alone. Considering that the power plant evaluated in this paper is already operational, a further development concerning to the power plant control system is required in order to evaluate disturbances and frequency variations, generated by the electrical grid during normal operation, as the loads applied to the turbines are intrinsically associated to the grid frequency. A computer program able to simulate the control system was developed to cope with these instabilities and to guarantee the necessary protection to the power plant operation. The develop program was made using MATLAB Simulink®. The main components of the power plant consists of 2 gas turbines of 90 MW each and a steam turbine of 320 MW, totalizing 500 MW. Firstly, the power plant main components were constructed separately. Once obtained stable models, the exhaust from the gas turbine was connected to the water-steam cycle through the heat recovery steam generator. The main parameters necessary to adjust the model such as gains, limits and constants were obtained from the power plant operational data. The simulation results allowed the evaluation of some key parameters; others are possible but not shown, such as power, exhaust gas temperature, fuel flow and variable stator angles during grid instabilities. The studies were conducted by testing the robustness, response time, transient analysis, steady state analysis and reliability of the proposed model.

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“…A major addition to the model is the inclusion of a combined cycle gas turbine (CCGT) representation [10], which is based on existing gas turbine models [11,12] with the addition of a heat recovery steam generator (HRSG) and steam turbine [13,14,15]. The steam turbine may be neglected in this case, apart from its contribution to the system inertia, by assuming that its response is negligible up to 20 seconds following a frequency event.…”

Section: System Modelmentioning

confidence: 99%