Dynamic model for controller design of condensate throttling systems

Hu, Yong; Zeng, Deliang; Liu, Jizhen; Zhao, Zheng; Li, Yazhe

doi:10.1016/j.isatra.2015.07.002

Cited by 34 publications

(8 citation statements)

References 9 publications

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“…Simulations are given to illustrate the load response speed of different ES (Fig.9-14). Since power load control is not the focus of this paper, the control model and method used refers to [22,28]. The control scheme conventional coordinated control system (CCS) refers to the use of fuel flow to adjust pressure before engine, and the use of control valves of HP to adjust the power load [28].…”

Section: Es Used For Increasing Flexibilitymentioning

confidence: 99%

“…Since power load control is not the focus of this paper, the control model and method used refers to [22,28]. The control scheme conventional coordinated control system (CCS) refers to the use of fuel flow to adjust pressure before engine, and the use of control valves of HP to adjust the power load [28]. The control scheme condensate throttling is based on CCS plus a condensate flow adjustment part [28].…”

Section: Es Used For Increasing Flexibilitymentioning

confidence: 99%

See 1 more Smart Citation

Quantitative Analysis of Energy Storage in Different Parts of Combined Heat and Power Plants

Deng

Liang

et al. 2020

IEEE Access

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Section: Es Used For Increasing Flexibilitymentioning

confidence: 99%

Section: Es Used For Increasing Flexibilitymentioning

confidence: 99%

Quantitative Analysis of Energy Storage in Different Parts of Combined Heat and Power Plants

Deng

Liang

et al. 2020

IEEE Access

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“…Similarly, the scheme that utilizing TES capacity in turbine system itself (especially in deaerator and condenser) instead of additional TES facilities has also been proposed, named “condensate throttling” . The specific operational characteristics of the condensate system, control strategy design and dynamic processes simulation, control strategy optimization have been researched in recent years. These works prove that the steam extraction adjustment through condensate throttling can effectively enhance the flexibility of power plants.…”

Section: Introductionmentioning

confidence: 99%

A comprehensive thermodynamic analysis of load‐flexible CHP plants using district heating network

Sun

Cheng

et al. 2019

Int J Energy Res

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Summary Because of the rapid expansion of intermittent renewable energy, conventional coal‐fired power plants, including combined heat and power (CHP) plants, are required to improve the quick‐response ability to respond the changing demand of the grid. However, the flexibility of CHP plants is not easy to be improved because of the restriction of traditional load variation mechanism. This work presents a comprehensive thermodynamic analysis on the flexibility‐improving scheme using the thermal energy storage (TES) capacity of district heating (DH) network. A typical CHP plant and related DH network were selected as a case study. The flexibility demand under the context of renewables accommodation in the short timescale (counted by minutes) and the operational characteristics of CHP plants were analyzed on the basis of experimental data and thermodynamics. Besides, the influence of heat supply adjustment on heat users' indoor temperature was quantified with a dynamic model, and the thermal inertia of the DH network is discussed. Moreover, a thermodynamic model for the load variation processes simplified with operational characteristics was established to analyze the response ability improvement of CHP plants. Results of the case study show, the scheme can shorten approximately 34% of the response time while almost have no influence on the indoor temperature of heat users.

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“…Apart from the stored energy of the boiler, a large amount of thermal storage existing in the turbine side has being exploited and utilized in recent years. Lausterer [16] proposed condensate throttling to rapidly increase the power output of thermal power plants and Hu et al [17] set up its nonlinear dynamic model for controller design. Zhao et al [6] and Umezawa [18] developed feed water bypass and high-pressure (HP) extraction throttling techniques to improve the flexibility of unit.…”

Section: Introductionmentioning

confidence: 99%

Improved Boiler-Turbine Coordinated Control of CHP Units with Heat Accumulators by Introducing Heat Source Regulation

Wang¹,

Sun

Jing

et al. 2018

Energies

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It is significant for power system stability to improve the operation flexibility of grid-connected units. Such improvement has always been a hot topic, especially for coal-fired units. In recent decades, it has become increasingly urgent and challenging as large-scale fluctuant renewable energy is connected to the power grid. Boiler-turbine coordinated control strategy (CCS), which is employed to perform unit load control according to automatic generation control (AGC), has a slow ramp rate in general on account of large delay and inertia of boiler, so to improve the unit operating flexibility, it is necessary to explore usable heat storage and optimize the control strategy. In combined heat and power (CHP) units with heat accumulators, their heat and power are decoupled. Therefore the extraction steam that goes to the heating station can be regulated flexibly even operating in “heat-led mode”. The change of extraction steam flow has a significant influence on the turbine power output, so we propose to improve the load-following capability of CHP units by regulating the heat source flow. In this paper, the influencing model is set up, and it is about heat source flow variations on the electric power output. The load control strategy is further optimized and designed through combinations of CCS and heat source regulation. Finally simulations and analysis are performed on a 330MW CHP unit, and the results reveal that the power ramp rate with our strategy is two times faster than that with traditional strategy.

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Dynamic model for controller design of condensate throttling systems

Cited by 34 publications

References 9 publications

Quantitative Analysis of Energy Storage in Different Parts of Combined Heat and Power Plants

Quantitative Analysis of Energy Storage in Different Parts of Combined Heat and Power Plants

A comprehensive thermodynamic analysis of load‐flexible CHP plants using district heating network

Improved Boiler-Turbine Coordinated Control of CHP Units with Heat Accumulators by Introducing Heat Source Regulation

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