Flexibilization of steam power plants as partners for renewable energy systems

Richter, M.; Möllenbruck, Florian; Obermüller, Frank; Knaut, Andreas; Weiser, Florian; Lens, Hendrik; Lehmann, Dorothea

doi:10.1109/pscc.2016.7540840

Cited by 17 publications

(7 citation statements)

References 1 publication

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“…Insufficient steam flow causes temperature increase and thermal stresses in turbine stages. It is important to revise all of the control loops and measuring devices in case the of power unit operation at low loads to avoid exploitation and performance problems [7,17]. The steadystate simulation analysis of the power unit model shows a good accordance to reference operating data throughout the power unit operating range.…”

Section: Discussionmentioning

confidence: 97%

Analysis of Coal-Fired Power Unit Operation in Reduced Minimum Safe Load Regime

Żymełka¹,

Żyrkowski²,

Bujalski³

2018

Thermal Power Plants - New Trends and Recent Developments

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Large coal-fired power plants were typically designed as a base load units. Any changes in load level, as well as start-up time, are noticeably slow on that kind of units. However, in order to adapt to changing market conditions with increasing number of renewable energy sources, coal-fired power plants need to improve their flexibility. In the paper, 200 MWe class unit has been taken into consideration. During the test campaign, a minimum safe load of the unit was decreased from 60 to 40%. Paper presents results of a model that was made using Ebsilon ® Professional software. The simulation model is comprised of boiler and turbine part of the power unit. Obtained results were validated using measurements collected from the test campaign. Parameters important from the technical and economical point of view were investigated. Results revealed that simulation model can be utilised successfully to scrutinise coal-fired units under off-design operation conditions. As the outcome of the performed analysis, a number of issues related to low load operation of the coal-fired unit are presented and discussed. Paper indicates sensitive areas that need to be addressed when operation in decreased safe load is considered. Finally, overall potential for flexibility improvement for 200 MWe class coal-fired units has been evaluated.

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Section: Discussionmentioning

confidence: 97%

Analysis of Coal-Fired Power Unit Operation in Reduced Minimum Safe Load Regime

Żymełka¹,

Żyrkowski²,

Bujalski³

2018

Thermal Power Plants - New Trends and Recent Developments

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“…These effects are accompanied by a more frequent provision of control services 16 . This is not least due to the growth of renewable energies 17 . One response from power plant operators is to make power plants more flexible 18 .…”

Section: Power Plant System Modelmentioning

confidence: 99%

Evaluation of the effects of a load shedding at a lignite power plant

Prause

Koltermann

Meinke

et al. 2021

Energy Science & Engineering

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The load‐shedding scenario describes an unscheduled load reduction in a power plant so that it produces only the electricity that is needed by the plant itself. The reason for such a scenario is a collapse of power supply in the transmission network. In the subsequent restoration of the electrical supply, different options are distinguished. An essential part of each option is island operating or black start capable thermal power plants. The load‐shedding scenario is complex and multilayered. If process steam is also decoupled during the load shedding, high exhaust steam temperatures in the turbine stages can lead to plant shutdown. In addition, component damage can be expected in thick‐walled components due to high temperature and pressure amplitudes. Thus, it can be shown in this paper that the lifetime losses are highest at the high‐pressure preheater 6 and at the deheater and that the process heat coupling cannot be operated with constant mass flow under all circumstances. In order to investigate these issues, a detailed model of a lignite power plant has been created, which was developed in Modelica for simulating and comparing scenarios for a variety of applications. The model comprises the entire water‐steam cycle including turbines, preheaters and pumps, as well as a very detailed boiler model including the air supply, coal mills, heating surfaces, and piping. Furthermore, the power plants' control system has been implemented in a very precise way. In addition, the study involves a calculation of lifetime consumption for specific components to evaluate the effects. In summary, it can be stated that this study examines the thermodynamic aspects during a load‐shedding scenario for the first time. It focuses on processes within the power plant and thus differs significantly from other studies on this topic, which approach the issue from the electrical grid side.

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“…Apparently, this is just a temporary solution and does not address the issue of the ramping shortage. The third strategy, proposed from the perspective of the supply side, is to enhance the flexibility of generation resources to quickly follow the dispatch for alleviating the system's fluctuations [9][10][11][12]. Although it offers an effective way for accommodating more renewable energy, it needs a large investment in adding new plants or retrofitting the existing ones.…”

Section: Introductionmentioning

confidence: 99%

Game-Theory Based V2G Coordination Strategy for Providing Ramping Flexibility in Power Systems

et al. 2020

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Large-scale integration of renewable generation into power systems invariably affects the system ramping capability. However, the vehicle-to-grid (V2G) concept that allows for using electric vehicles (EVs) as energy storages with the capability of bidirectional energy transfer between the EVs and the grid, can be employed to mitigate the above adverse effect. This paper proposes a game-theory-based V2G coordination strategy that uses EV clusters to improve ramping flexibility in power systems. In the proposed strategy, the V2G concept, representing the interactions between the distribution system operator (DSO) and EV clusters, is formulated as a Stackelberg game. The DSO acts as a leader who decides the charging prices for the buses to which the EV clusters are connected, while the EV clusters simply serve as followers, scheduling their own charging and discharging. This bi-level model is further reduced to a single-level, mixed-integer second-order cone programming (MISOCP) problem based on the Karush-Kuhn-Tucker (KKT) conditions, the strong duality theorem and second-order cone (SOC) relaxation. The performance of the proposed V2G coordination strategy on a modified IEEE 33-bus system connecting EV clusters and PV generations is investigated through simulations, and the results demonstrate that the largest ramp of the system can be reduced by up to 39% when EV clusters are providing flexibility, while the EV clusters can also have greatly reduced charging costs.

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Flexibilization of steam power plants as partners for renewable energy systems

Cited by 17 publications

References 1 publication

Analysis of Coal-Fired Power Unit Operation in Reduced Minimum Safe Load Regime

Analysis of Coal-Fired Power Unit Operation in Reduced Minimum Safe Load Regime

Evaluation of the effects of a load shedding at a lignite power plant

Game-Theory Based V2G Coordination Strategy for Providing Ramping Flexibility in Power Systems

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