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RISS 인기검색어
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- 저자 : Yang Yude (검색결과 5 건)
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OPF Calculation with Small-Signal Trajectory Constraints
Yang Yude,Mo Fujun,Liu Bin,Qin Zhijun 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.3
In order to avoid the complexity of obtaining the sensitivity in the usual optimal fl ow with small signal stability, which is easily result from the mere consideration of active power output optimization or the change of element model, a new model is proposed to improve the small-signal stability of the system by constraining the perturbation trajectory curve. Based on the time-domain simulation method, a power fl ow optimization model with small-signal trajectory constraint is established by extracting the damping ratio of the perturbation trajectory and forming constraints. The optimization calculation results of Western Systems Coordinating Council 3-generator 9-node system and China Electric Power Research Institute 6-generator 22-node system prove that the corresponding minimum damping ratio of the system increases with the increase of the constraint value of approximate damping ratio, which demonstrates the eff ectiveness of the model.
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Wind farm resonance characteristics analysis based on harmonic impedance measurement method
Yang, Yude,Yuan, Lili,Qin, Zhijun,Liu, Hui The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.4
Recently, subsynchronous oscillation (SSO) has been captured in direct-drive permanent magnetic synchronous generator (PMSG) based wind farms in many areas without series compensation in nearby power grids. However, there are fewer reports related to this new type of SSO. In addition, an analysis of the new SSO based on existing methods is computationally cumbersome, and the control effect of the converter was generally simplified in previous studies, which lead to serious errors. This paper proposes a method for analyzing the resonance characteristics of wind farms based on impedance measurement to simplify calculations and improve accuracy. The correctness and effectiveness of the proposed method are validated through the IEEE first benchmark model. A time-domain simulation model of a direct-drive PMSG is established and analyzed by harmonic impedance measurement. The results show that SSO exists when direct-drive PMSGs are connected to a weak AC system. The converter of the direct-drive PMSG exhibits a small negative value at the oscillation mode frequency. This means that the converter behaves like a capacitor with negative impedance. The capacitive impedance of the converter forms a resonant loop with the inductance of the AC grid and causes unstable SSO.
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Multidimensional Firefly Algorithm for Solving Day-Ahead Scheduling Optimization in Microgrid
Yang YuDe,Qiu JinLian,Qin ZhiJun 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.4
In this paper, an improved metaheuristic optimization algorithm based on the fi refl y algorithm, called multidimensional fi refl y algorithm (MDFA), is presented for solving day-ahead scheduling optimization in a microgrid. The proposed algorithm takes the output of power generations among a quantity of distributed energy resources during 24 h together rather than a single hour as a fi refl y separately. The proposed algorithm is combined with strategy of solving equality constraint replacing the use of the penalty-function technique. It is also enhanced by using a novel method in parameters self-adaption instead of applying fi xed values, resulting in avoiding tuning frequently the algorithm parameters during the process of optimization. The MDFA is utilized for optimization of energy production cost in a microgrid. The superiority of the MDFA is demonstrated by using the classic test power system proved in the previous literature. The solutions obtained by MDFA are compared with the results found by fi ve famous optimization algorithms. The high performance of MDFA is established by the quality with the minimum total cost, the reliability of gained solutions, the speed of convergence, and the ability to satisfy various constraints
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Wenjun Zhu,Chengyue Yang,Zhongxu Yu,Junhua Xiao,Yude Xu 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.6
This paper presents the corrosion-induced cracking performance of reinforced concrete in a chloride condition. The meso-scale structures of concrete specimens were studied according to the X-ray micro-computed tomography test, including the corrosion propagation, the accumulation and transportation of corrosion products, the defects and cracking behaviors of concrete cover. The experimental results show that the defects could provide a reasonable space for the accommodation of corrosion products, which could significantly increase the corrosion process and postpone the cracking performance. The propagation of the cracking path initiating from the corrosion area of the reinforcement to the concrete cover was also captured based on the experimental images, which can make contribution to the recognition of corrosion-induced cracking behavior of the concrete cover.
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Li Ling,Lu Guangzhen,Liang Zhencheng,Li Bin,Luo Cuiyun,Yang Yude,Zhu Dunlin,Liang Yangdou 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.5
Reducing the grid-connected volatility of wind farms and improving the frequency regulation capability of wind farms are one of the mainstream issues in current research. Energy storage system has broad application prospects in promoting wind power integration. However, the overcharge and over-discharge of batteries in wind storage systems will adversely affect the service life of energy storage. In order to avoid the risk of overcharge and over-discharge of energy storage and the lack of frequency modulation capability, an energy storage SOC optimization method based on Bollinger Bands is proposed. When the system is in the frequency modulation mode, the strategy realizes the dynamic optimization of the energy storage SOC to control the energy storage SOC in a safe range, so that it can meet the regulation requirements of the wind storage system. The effectiveness of the proposed method is verified by the simulation of power grid examples.
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