An Optimal Day-Ahead Thermal Generation Scheduling Method to Enhance Total Transfer Capability for the Sending-Side System with Large-Scale Wind Power Integration

Zhang, Yuwei; Liu, Wenying; Yue, Huan; Zhou, Qiang; Wang, Ningbo

doi:10.3390/en13092375

Cited by 3 publications

(3 citation statements)

References 22 publications

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“…According to the equal area criterion, if the system is under the critical condition of transient stability, as shown in Figure 3, the equivalent rotor's acceleration area A and the biggest possible deceleration area D are equal in the first swing. In this condition, P m gets its maximum value P max m , which is the TSTTC of transmission lines [5].…”

Section: Sensitivity Between Tsttc and Thevenin Equivalent Voltagesmentioning

confidence: 99%

“…Several studies proposed methods for improving the system transient stability, as well as enhancing TSTTC from different aspects. One of the effective methods is active power control strategy, which reschedules the generation plans of thermal generation units to improve the system transient stability, thereby enhancing TSTTC [3][4][5]. However, for the sending-end integrated with large-scale RES, the original generation plans of thermal generation units are made considering maximizing the consumption of RES power, and rescheduling generation plans may crowd out the consumption space for RES power.…”

Section: Introductionmentioning

confidence: 99%

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Reactive Power Control Method for Enhancing the Transient Stability Total Transfer Capability of Transmission Lines for a System with Large-Scale Renewable Energy Sources

et al. 2020

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With the increased proportion of intermittent renewable energy sources (RES) integrated into the sending-end, the total transfer capability of transmission lines is not sufficient during the peak periods of renewable primary energy (e.g., the wind force), causing severe RES power curtailment. The total transfer capability of transmission lines is generally restricted by the transient stability total transfer capability (TSTTC). This paper presents a reactive power control method to enhance the TSTTC of transmission lines. The key is to obtain the sensitivity between TSTTC and reactive power, while the Thevenin equivalent voltage is the link connecting TSTTC and reactive power. The Thevenin theorem states that an active circuit between two load terminals can be considered as an individual voltage source. The voltage of this source would be open-circuit voltage across the terminals, and the internal impedance of the source is the equivalent impedance of the circuit across the terminals. The Thevenin voltage used in Thevenin’s theorem is an ideal voltage source equal to the open-circuit voltage at the terminals. Thus, the sensitivities between TSTTC and the Thevenin equivalent voltages of the sending-end and receiving-end were firstly derived using the equal area criterion. Secondly, the sensitivity between the Thevenin equivalent voltage and reactive power was derived using the total differentiation method. By connecting the above sensitivities together with the relevant parameters calculated from Thevenin equivalent parameter identification and power flow equation, the sensitivity between TSTTC and reactive power was obtained, which was used as the control priority in the proposed reactive power control method. At last, the method was applied to the Gansu Province Power Grid in China to demonstrate its effectiveness, and the accuracy of the sensitivity between TSTTC and reactive power was verified.

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Section: Sensitivity Between Tsttc and Thevenin Equivalent Voltagesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reactive Power Control Method for Enhancing the Transient Stability Total Transfer Capability of Transmission Lines for a System with Large-Scale Renewable Energy Sources

et al. 2020

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“…Therefore, the market design of this financial aid needs to be further improved so that more flexibility modifications could be implemented [17]. Before that, it is crucial to determine when to start up or shut down power units and how to dispatch their power outputs to meet system power demand and spinning reserve requirements while satisfying generation constraints over a specific time series [18,19]. These problems are traditionally called unit commitment (UC).…”

Section: Introductionmentioning

confidence: 99%

On the Way to Integrate Increasing Shares of Variable Renewables in China: Experience from Flexibility Modification and Deep Peak Regulation Ancillary Service Market Based on MILP-UC Programming

Zhang

2021

Sustainability

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China has declared ambitious carbon emission reduction targets and will integrate increasing shares of variable renewables for the next decades. The implementation for flexibility modification of thermal power units and deep peak regulation ancillary service market alleviates the contradiction between rapid capacity growth and limited system flexibility. This paper establishes three flexibility modification schemes and two price rules for simulation and proposes an analysis framework for unit commitment problem based on mixed-integer linear programming to evaluate the policy mix effects. Results confirm the promoting effects of flexibility modification on integrating variable renewables and illustrate diverse scheme selections under different renewables curtailment. Particularly, there is no need for selecting expensive schemes which contain more modified units and more developed flexibility, unless the curtailment decrement is compulsorily stipulated or worth for added modification cost. Similarly, results also prove the revenue loss compensation effect of deep peak regulation ancillary service market and illustrate diverse price rule selections under different curtailment intervals. Price rule with more subdivided load intervals and bigger price differences among them is more effective, especially under the higher requirement for curtailment rate. Therefore, the government should further enlarge flexibility modification via but not limited to more targeted compensation price, while generators should further consider a demand-based investment.

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Research on an optimization model for wind power and thermal power participating in two-level power market transactions

Fan

Huang²,

Cong

et al. 2022

International Journal of Electrical Power & Energy Systems

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An Optimal Day-Ahead Thermal Generation Scheduling Method to Enhance Total Transfer Capability for the Sending-Side System with Large-Scale Wind Power Integration

Cited by 3 publications

References 22 publications

Reactive Power Control Method for Enhancing the Transient Stability Total Transfer Capability of Transmission Lines for a System with Large-Scale Renewable Energy Sources

Reactive Power Control Method for Enhancing the Transient Stability Total Transfer Capability of Transmission Lines for a System with Large-Scale Renewable Energy Sources

On the Way to Integrate Increasing Shares of Variable Renewables in China: Experience from Flexibility Modification and Deep Peak Regulation Ancillary Service Market Based on MILP-UC Programming

Research on an optimization model for wind power and thermal power participating in two-level power market transactions

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