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The uncertainty and intermittency of the available wind resource in nature would potentially cause wind generation curtailment when the flexibility of the integrated power grid is limited, especially in small-scale microgrids for islands. In this paper, an optimal configuration method is proposed to use thermal energy storage (TES) to relieve wind generation curtailment in an island microgrid. The thermal network is modeled along with the electrical network to utilize its regulation capability, while TES is introduced as an additional flexibility resource. The detailed cost models of combined heat and power (CHP) units and TES are presented to realize the objective of minimizing the overall operating cost. The performance of TES in improving wind power utilization is firstly validated by using an electrical boiler (EB) as a benchmark and further analyzed under different scenarios considering the growths of wind power capacity, electrical load, and heat load. The effectiveness of the proposed method is validated using real-world data obtained from the practical island microgrid.
Huanhuan Luo; Weichun Ge; Jingzhuo Sun; Quanyuan Jiang; Yuzhong Gong. Using Thermal Energy Storage to Relieve Wind Generation Curtailment in an Island Microgrid. Energies 2021, 14, 2851 .
AMA StyleHuanhuan Luo, Weichun Ge, Jingzhuo Sun, Quanyuan Jiang, Yuzhong Gong. Using Thermal Energy Storage to Relieve Wind Generation Curtailment in an Island Microgrid. Energies. 2021; 14 (10):2851.
Chicago/Turabian StyleHuanhuan Luo; Weichun Ge; Jingzhuo Sun; Quanyuan Jiang; Yuzhong Gong. 2021. "Using Thermal Energy Storage to Relieve Wind Generation Curtailment in an Island Microgrid." Energies 14, no. 10: 2851.
The volatility and uncertainty of high-penetration renewable energy (RE) challenge the stability of the power system. To tackle this challenge, an optimal dispatch of high-penetration RE based on flexible resources (FRs) is proposed to enhance the ability of the power system to cope with uncertain disturbances. Firstly, the flexibility of a high-penetration RE integrated power system is analyzed. The flexibility margin of power supply and flexible adaptability of RE are then introduced as the evaluation indices for optimal operation. Finally, a multi-objective optimal dispatch model for power system flexibility enhancement based on FRs under the constraint of flexibility indices is proposed. The simulation results show that the proposed optimal dispatch can effectively enhance the flexibility of the power system and the penetration of RE and reduce pollutant emissions. Compared with the conventional method, the daily average emissions of CO2, SO2, and NOx with the proposed method are reduced by about 83,600 kg, 870 kg, and 370 kg, respectively, the maximum allowable volatility of net load is increased by 7.63%, and the average volatility of net load is reduced by 2.67%.
Jiawei Feng; JunYou Yang; Haixin Wang; Huichao Ji; Martin Onyeka Okoye; Jia Cui; Weichun Ge; Bo Hu; Gang Wang. Optimal Dispatch of High-Penetration Renewable Energy Integrated Power System Based on Flexible Resources. Energies 2020, 13, 3456 .
AMA StyleJiawei Feng, JunYou Yang, Haixin Wang, Huichao Ji, Martin Onyeka Okoye, Jia Cui, Weichun Ge, Bo Hu, Gang Wang. Optimal Dispatch of High-Penetration Renewable Energy Integrated Power System Based on Flexible Resources. Energies. 2020; 13 (13):3456.
Chicago/Turabian StyleJiawei Feng; JunYou Yang; Haixin Wang; Huichao Ji; Martin Onyeka Okoye; Jia Cui; Weichun Ge; Bo Hu; Gang Wang. 2020. "Optimal Dispatch of High-Penetration Renewable Energy Integrated Power System Based on Flexible Resources." Energies 13, no. 13: 3456.
Improving the safety and stability of power systems by adjusting the controllable load to improve the wind power integration has become a hot research topic. However, the methodology of accurately controlling the load and fundamentally improving the wind power integration capacity has yet to be studied. Therefore, this paper proposes an intelligent regulation method for a controllable load. This method takes the new energy consumption assessment as feedback, and it combines the wind power acceptance assessment and scheduling plan to form the internal and external loop control structure, and it derives the controllable load intelligent regulation architecture. The load curve is decomposed by an interactive load observer, and the load curve is adjusted by the interactive load controller according to a given standard, thereby improving the new energy acceptance capability. Finally, based on the actual grid operation data of a provincial power grid in Northeastern China, the source grid load balancing process and the interactive load regulation model of the wind power system are simulated. The above method verifies the validity and rationality of the proposed method.
Jia-Jue Li; Bao-Zhu Shao; Jun-Hui Li; Wei-Chun Ge; Jia-Hui Zhang; Heng-Yu Zhou. Intelligent Regulation Method for a Controllable Load Used for Improving Wind Power Integration. Energies 2018, 11, 3085 .
AMA StyleJia-Jue Li, Bao-Zhu Shao, Jun-Hui Li, Wei-Chun Ge, Jia-Hui Zhang, Heng-Yu Zhou. Intelligent Regulation Method for a Controllable Load Used for Improving Wind Power Integration. Energies. 2018; 11 (11):3085.
Chicago/Turabian StyleJia-Jue Li; Bao-Zhu Shao; Jun-Hui Li; Wei-Chun Ge; Jia-Hui Zhang; Heng-Yu Zhou. 2018. "Intelligent Regulation Method for a Controllable Load Used for Improving Wind Power Integration." Energies 11, no. 11: 3085.
Frequency stability in an isolated grid can be easily impacted by sudden load or wind speed changes. Many frequency regulation techniques are utilized to solve this problem. However, there are only few studies designing torque compensation controllers based on power performances in different Speed Parts. It is a major challenge for a wind turbine generator (WTG) to achieve the satisfactory compensation performance in different Speed Parts. To tackle this challenge, this paper proposes a gain scheduled torque compensation strategy for permanent magnet synchronous generator (PMSG) based wind turbines. Our main idea is to improve the anti-disturbance ability for frequency regulation by compensating torque based on WTG speed Parts. To achieve higher power reserve in each Speed Part, an enhanced deloading method of WTG is proposed. We develop a new small-signal dynamic model through analyzing the steady-state performances of deloaded WTG in the whole range of wind speed. Subsequently, H∞ theory is leveraged in designing the gain scheduled torque compensation controller to effectively suppress frequency fluctuation. Moreover, since torque compensation brings about untimely power adjustment in over-rated wind speed condition, the conventional speed reference of pitch control system is improved. Our simulation and experimental results demonstrate that the proposed strategy can significantly improve frequency stability and smoothen power fluctuation resulting from wind speed variations. The minimum of frequency deviation with the proposed strategy is improved by up to 0.16 Hz at over-rated wind speed. Our technique can also improve anti-disturbance ability in frequency domain and achieve power balance.
Haixin Wang; JunYou Yang; Zhe Chen; Weichun Ge; Shiyan Hu; Yiming Ma; Yunlu Li; Guanfeng Zhang; Lijian Yang. Gain Scheduled Torque Compensation of PMSG-Based Wind Turbine for Frequency Regulation in an Isolated Grid. Energies 2018, 11, 1623 .
AMA StyleHaixin Wang, JunYou Yang, Zhe Chen, Weichun Ge, Shiyan Hu, Yiming Ma, Yunlu Li, Guanfeng Zhang, Lijian Yang. Gain Scheduled Torque Compensation of PMSG-Based Wind Turbine for Frequency Regulation in an Isolated Grid. Energies. 2018; 11 (7):1623.
Chicago/Turabian StyleHaixin Wang; JunYou Yang; Zhe Chen; Weichun Ge; Shiyan Hu; Yiming Ma; Yunlu Li; Guanfeng Zhang; Lijian Yang. 2018. "Gain Scheduled Torque Compensation of PMSG-Based Wind Turbine for Frequency Regulation in an Isolated Grid." Energies 11, no. 7: 1623.