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| 1 | Technology and engineering application of cross area HVDC interconnection system high-precision simulation modeling based on ADPSS显示文摘In recent years, a large number of high voltage direct current(HVDC) transmission projects have been connected to AC systems. This has started to have an impact on AC/DC hybrid power grids, particularly receiving terminal power grids. An HVDC system is a large-scale power electronic integrated nonlinear system, and it includes a primary system and a control and protection system. Hence, the precision and degree of detail of HVDC systems directly affect the actual effect of simulation. In recent years, in the case of the normal operation and failure of AC power grids, the abnormal fluctuation and even locking of HVDC systems caused by the inappropriate strategies of the control and protection system component have strongly affected power grids. This has significantly affected the safety and stability of receiving power grids and normal operation. In this study, the actual engineering HVDC control logic provided by a manufacturer is analyzed and simulated based on the user defined component library of the ADPSS electromagnetic transient calculation program, and an HVDC control model based on an actual system is established. The accuracy of the DC control custom model based on ADPSS is verified through the simulation of an actual power grid. | Weijie Zheng Jianfeng Yan Xujiang Chen Shuwen Xu Yalou Li | 2018 | Global Energy Interconnection2018，1，5： | 3 |
| 2 | Analysis and Design of Vector Control for VSC-HVDC Connected to Weak Grids显示文摘Voltage source converter based high voltage direct current transmission(VSC-HVDC)is considered one of the most suitable technologies to integrate renewable energies.However,connecting VSC to a weak grid is challenging since traditional vector control tends to become unstable under high power demand conditions.In this paper,an improved vector control method is proposed wherein a feed forward branch based on steady state and small signal analysis of the VSC system is added under weak grid situations.The feed forward branch promotes faster reactive power response,thus enhancing the stability of the VSC system.Since the improved vector control uses the same inner loop as traditional vector control,the proposed method allows for the ability to retain fault current suppression capabilities.Furthermore,the control parameters of the outer loop of the improved vector control need not vary according to the variation of the operating points,which makes it easy to implement.The feed forward branch is implemented by solving a nonlinear equation or through use of a look-up table.The influence of the estimation errors of short circuit ratio(SCR)on the control performance is also studied.The effectiveness of the improved vector control is demonstrated through small signal model analysis and time domain simulations. | Guanglu Wu Jun Liang Xiaoxin Zhou Yalou Li Agusti Egea-Alvarez Gen Li Hongying Peng Xing Zhang | 2017 | CSEE Journal of Power and Energy Systems2017，3，2： | 3 |
| 3 | Online Decision-Making and Control of Power System Stability Based on Super-Real-Time Simulation显示文摘During power grid cascading failure,the operating point changes frequently,resulting in a mismatch or inaccuracy of online pre-decision making emergency control strategy.To solve this problem,an online power system stability decisionmaking and control method based on super-real-time simulation is presented in this paper.A decision-making and control system is developed in which the three main operation modes,offline pre-decision-making,online pre-decision-making,and real-time control,are all coordinated.To verify the method,ADPSS(advanced digital power system simulator)is used to simulate a digital power grid with about 20,000 buses.The closed-loop operation of the digital power grid and the online decisionmaking and control system are implemented.Test results show that when online pre-decision making control strategies are mismatched,aided real-time control works well and can prevent power grid stability loss. | Fang Tian Xing Zhang Zhihong Yu Weijiang Qiu Dongyu Shi Jian Qiu Min Liu Yalou Li Xiaoxin Zhou | 2016 | CSEE Journal of Power and Energy Systems2016，2，1： | 2 |
| 4 | Coastal wetland loss and environmental change due to rapid urban expansion in Lianyungang, Jiangsu, China显示文摘 | Yangfan Li Yalou Shi Xiaodong Zhu Huhua Cao Tao Yu | 2014 | Regional Environmental Change2014，，3： | 1 |
| 5 | The Design and Implementation of the Data Mining Prototype System: RoboMiner显示文摘 | Liu Lijun Huang Yalou Xue Bin | 2000 | Computer Sciences (in Chinese)2000，27，10： | 1 |
| 6 | Using SVM to Extract Acronyms from Text显示文摘 | Xu Jun Huang Yalou | 2006 | Soft Computing2006，11，4： | 1 |
| 7 | Investigation of a coupling model of coordination between urbanization and the environment显示文摘 | Yangfan Li Yi Li Yan Zhou Yalou Shi Xiaodong Zhu | 2012 | Journal of Environmental Management2012，，： | 1 |
| 8 | The de sign and implementation of the data mining prototype system: RoboMiner显示文摘 | Liu Lijun Huang Yalou Xue Bin | 2000 | Computer Sciences2000，27，10： | 1 |
| 9 | Effect of sodium fluoride on expression of PI3K/Akt signal molecules and apoptosis in human osteosarcoma Saos-2 cells显示文摘To investigate the mechanism of fluoride induced apoptosis of osteoblasts in PI3K/Akt pathway and to understand the pathological mechanism of fluoride-induced apoptosis of osteoblasts.Osteoblasts were exposed to fluoride at 0(control group),5.0,10.0,20.0,40.0 mg/L sodium fluoride at the concentration of fluoride.The changes of PI3K-Akt signaling pathway and mitochondrial apoptotic pathway-related molecule FoxO1 were detected after 24 h and 48 h. | Jiang Xiangju Zhang Li He Yi Zhang Rong Shang Xiangyu Xie Yu He Mengya Zhang Yalou | 2021 | 解剖学杂志2021，44，S01： | 0 |
| 10 | Four-layer cache strategy of edge computing in education environment显示文摘The rapid development of MEC and 5G technology has aroused huge repercussions and aroused the attention of education and industry.The storage of educational resources,energy consumption and delays in use have become urgent issues.In response to the above problems,this paper proposes a three-tier education network model and abstracts the network modeling.At the same time,the DQN method in reinforcement learning is used to solve the modeling method and simulation.Finally,the simulation results show that this method can effectively improve the cache hit rate and reduce the network load. | Lingyun Lu Yalou Song | 2020 | 计算机教育2020，，12： | 0 |
| 11 | Optimal Operation of Flexible Distribution Networks for Security Improvement Considering Active Management显示文摘This paper presents a stochastic optimal operation problem of gas turbine integrated distribution networks in the presence of active management schemes,which is formulated as a multi-objective chance-constrained mixed integer nonlinear programming problem.The control variables are the on-load tap-changer tap position,the power provided by the distributed generation(DG),the DG power factor angle,the load participating in demand side management and the switch status.The objectives defined in this paper are to simultaneously minimize the expectation cost and variation coefficient of security distance.Uncertainties related to DG output and load fluctuation and fault power restoration under contingencies are also considered in the optimization problem.The collaboration of normal boundary intersection and the dynamic niche differential evolution algorithm is proposed to handle the optimal operation mode.Simulation results are presented and demonstrate the effectiveness of the proposed model.Compared with the operation result without the consideration of security,the security-constrained operation can reduce the expectation cost.Therefore,the proposed optimization is reasonable and valuable. | Jia Liu Pingliang Zeng Hao Xing Yalou Li Qiuwei Wu | 2023 | CSEE Journal of Power and Energy Systems2023，9，3： | 0 |
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