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arXiv 2024年

作者： Yu, Zekuan Zhong, Haiwang Ruan, Guangchun Yan, Xinfei The State Key Laboratory of Power System Operation and Control Dept. of Electrical Engineering Tsinghua University Beijing China The Sichuan Energy Internet Research Institute Tsinghua University China The Lab for Information & Decision Systems Massachusetts Institute of Technology Massachusetts United States

Modern network-constrained unit commitment (NCUC) bears a heavy computational burden due to the ever-growing model scale. This situation becomes more challenging when detailed operational characteristics, complicated constraints, and multiple objectives are considered. We propose a novel simplification method to determine the flexible temporal resolution for acceleration and near-optimal solutions. The flexible temporal resolution is determined by analyzing the impact on generators in each adaptive time period with awareness of congestion effects. Additionally, multiple improvements are employed on the existing NCUC model compatible with flexible temporal resolution to reduce the number of integer variables while preserving the original features. A case study using the IEEE 118-bus and the Polish 2736-bus systems verifies that the proposed method achieves substantial acceleration with low cost variation and high accuracy. Copyright © 2024, The Authors. All rights reserved.

关键词： Energy management

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Model Predictive control with Reach-avoid Analysis

arXiv

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arXiv 2023年

作者： Ren, Dejin Lu, Wanli Lv, Jidong Zhang, Lijun Xue, Bai State Key Lab. of Computer Science Institute of Software CAS Beijing China University of Chinese Academy of Sciences Beijing China National Engineering Research Center of Rail Transportation Operation and Control System Beijing Jiaotong University Beijing China

In this paper we investigate the optimal controller synthesis problem, so that the system under the controller can reach a specified target set while satisfying given constraints. Existing model predictive control (MPC) methods learn from a set of discrete states visited by previous (sub-)optimized trajectories and thus result in computationally expensive mixed-integer nonlinear optimization. In this paper a novel MPC method is proposed based on reach-avoid analysis to solve the controller synthesis problem iteratively. The reach-avoid analysis is concerned with computing a reach-avoid set which is a set of initial states such that the system can reach the target set successfully. It not only provides terminal constraints, which ensure feasibility of MPC, but also expands discrete states in existing methods into a continuous set (i.e., reach-avoid sets) and thus leads to nonlinear optimization which is more computationally tractable online due to the absence of integer variables. Finally, we evaluate the proposed method and make comparisons with state-of-the-art ones based on several examples. Copyright © 2023, The Authors. All rights reserved.

关键词： Model predictive control

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A Novel Triple Capacitor Multi-Level Submodule Mmc Topology with Fault Current Clearing Capability

SSRN

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SSRN 2023年

作者： Sun, Yinfeng Jia, Guobin Hao, Jiaqi Lu, Mingzhi Li, Guoqing Wang, Zhenhao Wu, Xueguang Modern Power System Simulation Control and Green Energy New Technol. Key Lab. The Ministry of Education Northeast Electric Power Univ. Jilin132012 China State Grid Smart Grid Research Institute Beijing China

In the high voltage direct current system based on modular multilevel converter (MMC-HVDC), the half-bridge submodule (HBSM) has become the preferred submodule for significant projects due to its convenient control and low cost. However, the DC shortcircuit protection performance of MMC-HVDC will seriously restrict its development in areas such as overhead lines, high voltage, and large capacity. This article proposes a triple capacitor multi-level submodule (TCMSM) based on a modular multilevel converter with DC fault-blocking capability. It utilizes at least one-third of the module capacitance in the bridge arm to reverse, suppress the DC fault current and turn off the diode. At the same time, the unidirectional conductivity of the diode can also prevent arc reignition at the fault point. The article also conducted in-depth research on the DC short-circuit fault elimination mechanism of this topology, and compared its performance with other topologies. Through analysis, it can be concluded that TCMSM reduces the initial investment and operating costs by reducing the number of devices inside the module while possessing the fault current blocking ability. Finally, MATlab.Simulink was used to simulate and verify the proposed new topology, and its performance was analyzed. © 2023, The Authors. All rights reserved.

关键词： Topology

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Reliability Assessment of Wind Farm with Wind Turbine Gearbox Fatigue

Reliability Assessment of Wind Farm with Wind Turbine Gearbo...

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IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Jiali Wang Xiaoqing Han Tianhao Song Yanbing Jia Shanxi Key Lab.of Power System Operation and Control Taiyuan University of Technology Tauyuan China

ISBN: (纸本)9781665434263

The gearbox of wind turbine has the longest downtime due to mechanical failure, and fatigue is the most important failure form of gearbox. Traditional wind reliability model not considering the influence of gear box of immobilized fatigue, this paper proposes a meter and gearbox fatigue reliability evaluation method of wind farms, this method is intuitive reflect the extent to which each gearbox fatigue damage caused by different failure rate difference, and applicable to other fatigue as the main failure forms of component reliability modeling. The fatigue failure rate model of wind turbine gearbox was established based on the fatigue analysis of wind turbine gearbox, and the fatigue failure state was embedded into the conventional wind turbine Markov model through the failure rate, which was applied to the reliability evaluation of containing wind farm to improve the evaluation accuracy. The results show that ignoring the gearbox fatigue failure will lead to the wind turbine outage risk assessment results are relatively conservative, overestimate the reliability level of wind farm, and the more serious the accumulation of gearbox fatigue damage, the more significant the impact on the system reliability.

关键词： Analytical models Wind farms Wind power generation Markov processes Fatigue power system reliability Wind turbines

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Research on control strategy of maximum power tracking variable step size perturbation & observation method for photovoltaic power generation system 5

Research on control strategy of maximum power tracking varia...

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5th International Conference on Energy Engineering and Environmental Protection, EEEP 2020

作者： Gao, Zhen Kai, Fei Xi, Ziqiang Hubei University of Technology Hubei Prov. Key Lab. of Efficient Solar Energy Utilization and Energy Storage Operation Control Wuhan430068 China State Grid Hubei Electric Power Company Wuhan Jiangxia District Power Supply Company Wuhan430000 China

There are three defects of traditional perturbation and observation method in the maximum power tracking control process of photovoltaic power generation systems, which are oscillation, misjudgment and poor tracking accuracy. Thus, a variable step perturbation and observation method based on power prediction is proposed for three-level DC/DC converters in this paper, which effectively solved oscillation, misjudgment, tracking accuracy problems, improving the tracking speed and precision of the algorithm, and the verification results of the maximum power tracking algorithm based on the three-level DC/DC converter structure has also been indicated. © Published under licence by IOP Publishing Ltd.

关键词： DC-DC converters

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Research on primary frequency regulation of grid integrated concentrating solar power plant 9

Research on primary frequency regulation of grid integrated ...

引用

9th China International Conference on Electricity Distribution, CICED 2021

作者： Qian, Minhui Zhao, Dawei Zhao, Liang Zhu, Lingzhi Wu, Fubao Chen, Ning Qin, Wenping Xu, Chang Jiangsu Eng. Technol. Res. Ctr. for Ener. Storage Conversion and Applic. China Elec. Pwr. Res. Inst. State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems Nanjing China Shanxi Key Lab of Power System Operation and Control Taiyuan University of Technology Taiyuan China College of Energy and Electrical Engineering Hohai University Nanjing China

ISBN: (纸本)9781728192291

High share of renewable energy will be one of the basic features of power systems in the future around the world. Compared with photovoltaic (PV) and wind power, concentrating solar power (CSP) equipped with heat storage system has similar regulation characteristics with thermal power units, and it can effectively overcome the intermittent and volatility of PV and wind power generation. Meanwhile, the CSP units can strongly support the voltage, frequency and short-circuit capacity of power systems. So, CSP is a very promising power generation technology for the future power system. The CSP unit has better ramp ability than thermal power unit, and can generally reach a speed between 2% and 5% of rated power per minute. Stated thus, the CSP unit has a good potential to participate in the primary frequency regulation of power grid. At present, there are many researches on the performance of each subsystem of the CSP unit in worldwide, and there are also some theoretical researches on the participation of CSP unit in the dispatching operation of power system. However, there is a lack of research reports on CSP plant's participation in the primary frequency regulation of the power grid, which is an urgently needed feature for the future power systems with high share of renewable energy. In this paper, a model with primary frequency regulation ability of CSP unit is established in DIgSILENT powerFactory software. A revised two-area four-machine system is used to investigate the CSP unit's participation in primary frequency regulation of power system. The simulation results show the good frequency regulation performance of CSP unit, which can effectively support the stable operation of power system with high share of renewable energy in the future. © 2021 IEEE.

关键词： Concentrated solar power

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Comprehensive Evaluation of AC-DC Distribution Network in Photovoltaic-Energy Storage Charging Station Based on AHP-TOPSIS Method

Comprehensive Evaluation of AC-DC Distribution Network in Ph...

引用

IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Xinfang Zhang Hao Li Lei Wang Yizhao Liu Fangda Wang Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China Hebei Gas Co. Ltd Taiyuan China Electric Power Research Institute Taiyuan China

ISBN: (纸本)9781665434263

Increasing studies have shown that DC distributi on will contribute substantially to future photovoltaic-energy st orage charging station (PV-ES CS) owing to the high efficiency and play an important role in distribution networks. It is neces sary to comprehensively compare low voltage DC (LVDC) with AC (LVAC) distribution networks for planning and design of PV-ES CS. This paper presents a comprehensive evaluation mo del of the distribution system based on AHP-TOPSIS theory. The evaluation index system, including reliability, economy and adaptability, is proposed based on the difference of AC and DC distribution network structure and performance. The propose d approach integrates ideal solution (TOPSIS) and Analytic hie rarchy process (AHP) to determine the weights. Finally, the re sults obtained from the case studies have demonstrated the rati onality and feasibility of proposed evaluation model. It is instru ctive to the application and popularization of DC PV-ES CS.

关键词： Photovoltaic systems power distribution Distribution networks system integration Charging stations Optical fiber networks Reliability theory

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Single-step model predictive control of VSC converter station supplying power to passive network 4

Single-step model predictive control of VSC converter statio...

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4th International Conference on Advanced Electronic Materials, Computers and Software Engineering, AEMCSE 2021

作者： Shuang, Lv Yu, Yu Wenkang, Yang Lichao, Xu Hubei University of Technology Hubei Key Lab. for High-Efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System China State Grid Hubei Electric Power Co.Ltd. Wuhan Electric Power Supply Company Wuhan430068 China

ISBN: (纸本)9781665415965

The AC power quality of the VSC converter station that supplies power to the passive network is in most cases affected by the PI control parameters. In this paper, the model predictive control algorithm without the need to modulate the PI parameters is applied to the VSC converter station control. Firstly, the discrete mathematical model of VSC inverter in αβ coordinate is derived, and the one-step prediction model of AC control voltage is established. Then, the corresponding cost function is constructed to obtain the next time optimal switching state to act on the inverter with the minimum cost function. Finally, a VSC inverter model that supplies power to the passive network is established in MATlab. and a single-step model predictive control strategy is used to do simulation studies on the conditions of linear load, sudden load change, AC voltage reference value change, and model parameter deviation. The results show that the single-step model predictive control method adopted in this paper improves the power quality and the robustness of the control system. © 2021 IEEE.

关键词： Passive networks

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control Strategy of Hybrid Energy Storage in Large-Scale Wind Farm

Control Strategy of Hybrid Energy Storage in Large-Scale Win...

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IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Liang Huang Hao Chen Yanbing Jia Feng Tian Yun Bai Mengdie Li Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China State Grid Shanxi Electric Power Company Taiyuan Power Supply Company Taiyuan China Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781665434263

The large-scale access of renewable energy sources such as wind power will affect the operation and dispatch of the power system, and will affect the safe and stable of the power grid. The ESS has the ability to respond quickly, which can reduce the impact of wind power on the grid. Based on a hybrid energy storage with a certain capacity, a corresponding rolling optimization control strategy is proposed. Using batteries and super capacitor as energy storage media, an optimal control model targeting the state of charge of the hybrid energy storage system is established, and the solution is solved by a particle swarm optimization algorithm. The simulation example shows that a HESS with a certain capacity on the generation side can achieve a smooth grid connection. The control strategy proposed in this paper extends the service life of the battery.

关键词： Renewable energy sources power supplies Capacitors Optimal control system integration Wind power generation Wind farms

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Research on Low Voltage Ride through and Reactive power Support of Hydrogen Production power Supply

Research on Low Voltage Ride through and Reactive Power Supp...

引用

Smart power & Internet Energy systems (SPIES), International Conference on

作者： Mingqi Zhang Ruitong Liu Kui Wang Kai Sun Qinglai Guo Yongdong Li Dept. of Electrical Energineering State Key Lab. of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China State Grid Liaoning Electric Power Co. LTD. Electric Power Research Institute Shenyang China

Hydrogen energy, a type of green secondary energy, has attracted much attention in recent years. The production of hydrogen by water electrolysis is less harmful to the environment and makes it possible to obtain hydrogen with a high degree of purity. But it requires a lot of electricity and is expensive. Installed capacity and the share of electricity generation from new energy sources have increased recently. The "double high" trend in the power system is becoming apparent. The combination of new energy power generation and hydrogen production by water electrolysis can not only promote the absorption of new energy power generation, but also reduce the cost of hydrogen production. The conventional thyristor power supply system for hydrogen production has low power factor and poor harmonic performance, which cannot meet the requirements of the new power system. Hydrogen production power supply based on fully controlled devices is gradually becoming mainstream. In this paper, the low voltage ride through capability and the reactive power support function for the power grid of hydrogen production power supply based on fully controlled devices are verified by simulation. For both symmetrical and asymmetrical faults, the hydrogen production power supply can ride through the fault.

关键词： Performance evaluation Reactive power power supplies Hydrogen Production Voltage power grids

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