Songyuan Power Supply Company

Jilin, China

Songyuan Power Supply Company

Jilin, China
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Huang W.,Shanghai JiaoTong University | Zhou L.-D.,Shanghai JiaoTong University | Zheng Y.-H.,Shanghai JiaoTong University | Wang X.,Shanghai JiaoTong University | And 3 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2012

A novel control strategy based on neural network PI algorithm and repetitive control is proposed. Compared with traditional PI controller, this approach has quicker response speed and higher accuracy of compensation. BP neural network technology is adopted to conduct an on-line real-time adaptive setting of PI controller parameter values according to the error value, thus meeting the requirement of an optimal control law. The steady-state accuracy of the device is guaranteed by taking the advantage of the zero steady-state error ability of the repetitive controller. The validity of the proposed method is demonstrated by simulation analysis comparing with traditional PI controller.


Zhou C.,Shanghai JiaoTong University | Zheng Y.,Shanghai JiaoTong University | Wang X.,Shanghai JiaoTong University | Li L.,Shanghai JiaoTong University | And 2 more authors.
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2014

An analysis model is established aiming at the inaccuracy of split-capacitor-type three-phase-four-wire DSTATCOM used in the reactive power compensation for unbalanced load and its control strategy based on dual-loop controller is proposed aiming at the poor periodic signal tracking of the traditional PI controller. It combines the PI controller, which has quick response to instruction, with the repetitive controller, which has high accuracy of periodic signal control, and applies the dual-loop controller in the inner current loop of DSTATCOM to track the current. The design of the controller is analyzed in detail and verified by simulation and experiment. Results indicate that, the split-capacitor-type three-phase-four-wire DSTATCOM controlled by the proposed strategy has better compensation effect than by the traditional PI control method, guarantees the response speed, improves the accuracy of current tracking, achieves the reactive power compensation for the unbalanced load, reduces output current and THD, and improves the quality of grid-connection current.


Yu L.,Shanghai JiaoTong University | Zheng Y.,Shanghai JiaoTong University | Wang X.,Shanghai JiaoTong University | Li L.,Shanghai JiaoTong University | And 2 more authors.
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2013

As to the short-term electric power load forecasting, its accuracy is affected by many uncertain influence factors. To solve this problem, a novel method using Similar Days based on fuzzy clustering analysis was proposed in this paper. Firstly it categorized weather factors as temperature, air pressure, wind speed, overcast and rainy etc, then together with week type and day type they consist of the influence items. According to the items above, fuzzy rules were applied to establish the mapping table to get the factors quantized. Next cluster technology was utilized to classify the content in the mapping table, and the similar days are chosen out based on the clustering level, which is to reduce the numbers of samples and accelerate the speed of selection. Secondly aiming to eliminating non-gaussian noise contained in the similar day's power load, wavelet transform was adopted to extract the low sequence components. Finally a SVM (Support Vector Machine), which was optimized by PSO (particle swarm optimization) algorithm, was designed to predict the low frequency part, while, mean square weighted method was used to predict the high frequency part. The simulation results show this approach is encouraging.


Lan W.H.,Shanghai JiaoTong University | Zheng Y.H.,Shanghai JiaoTong University | Li L.X.,Shanghai JiaoTong University | Wang X.,Shanghai JiaoTong University | And 2 more authors.
Applied Mechanics and Materials | Year: 2014

To make effective fault diagnosis of grounding grid, a new method using Self-Adaptive Particle Swarm Optimization (SAPSO) is proposed. Firstly, the grounding grid can be handled as a resistive network to establish fault diagnosis equations. Then the objective function based on minimum energy principle is added to lower the ill-condition of diagnostic equation. Next, according to optimization techniques, a new method of SAPSO is proposed to solve the corrosion diagnosis equations. The method takes advantage of the high global searching ability of SAPSO to obtain the optimal solution to the diagnosis model. By means of the analysis of the simulation, the correctness and reliability of the method have been verified. © (2014) Trans Tech Publications, Switzerland.


Zheng L.C.,Shanghai JiaoTong University | Li L.X.,Shanghai JiaoTong University | Zheng Y.H.,Shanghai JiaoTong University | Wang X.,Shanghai JiaoTong University | And 2 more authors.
Applied Mechanics and Materials | Year: 2014

Lead-acid batteries are widely used in all walks of life, the State-of-Charge is the most important part of the battery management system. On account of the strong coupling, multivariable, nonlinear characteristics of the batteries, this paper adopts the LS-SVM method to predict remaining battery capacity. The nonlinear POLYnomial (POLY) kernel is employed to design the LS-SVM. Aiming at predigesting the hardware requirement of the LS-SVM application, this paper uses the deduced induction of the input vector to simplify the POLY kernel, greatly reducing the memory capacity of the practical application. At last, simulation on MATLAB was done to verify the validity of the proposed model, the simulation results show that the LS-SVM based on the simplified PLOY kernel is applicable to battery SOC estimation, and the estimation error can be controlled within 5%. © (2014) Trans Tech Publications, Switzerland.


Li K.,Shanghai JiaoTong University | Zheng Y.H.,Shanghai JiaoTong University | Wang X.,Shanghai JiaoTong University | Li L.X.,Shanghai JiaoTong University | And 2 more authors.
Applied Mechanics and Materials | Year: 2014

To realize the STATCOM based on Modular Multilevel Converter (MMC), a simplified double-closed loop structure, simplifying from the control method of High Voltage Direct Current (HVDC) based on MMC, is presented. ConsideringMMC's DC side using capacitors, a part-controlling method based on energy balancing is proposed, to solve the voltage balancing problem. With the part-controlling fixing thechanging capacitors'voltage and the simplified double-closed loop control method, voltage fluctuation could be reduced, and the load's reactive power could be compensated. The correctness and the effectiveness of the MMC-STATCOM controllingscheme is verified by Matlab/Simulink. © (2014) Trans Tech Publications, Switzerland.


Zhang Y.L.,Shanghai JiaoTong University | Zheng Y.H.,Shanghai JiaoTong University | Li L.X.,Shanghai JiaoTong University | Wang X.,Shanghai JiaoTong University | And 2 more authors.
Applied Mechanics and Materials | Year: 2014

With GIS being widely used, partial discharge detecting and defect pattern recognition become more and more meaningful and important. To realize defects identification of partial discharge map in GIS, a novel method based on Radical Basis Function (RBF) neural network is proposed. Firstly, a model is constructed to simulate the discharge pattern map by the use of random function randint. Secondly, based on the model above, a lot of data which meet the condition can be collected to provide for pattern recognition. Then, a RBF network is introduced to identify the pattern recognition. It can be trained by using the data above. Finally, through changing training error, high correct rate can be got. These indicate that the method is effective. © (2014) Trans Tech Publications, Switzerland.


Wang S.,Shanghai JiaoTong University | Li L.,Shanghai JiaoTong University | Zheng Y.,Shanghai JiaoTong University | Yao G.,Shanghai JiaoTong University | And 4 more authors.
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2012

A multi-model PI controller is proposed for the voltage control of STATCOM, which applies multiple models to PI controller. The PI controller has simple structure, short computing time and easy realization, while the multi-model strategy is applied to ensure the accuracy and speed of voltage control at connecting point for different impactive loads. Simulative results show that, compared to traditional PI controller, the multi-model PI controller has better adaptability to the voltage variation at connecting point and higher compensation precision.


Gao Q.,Hohai University | Wei Z.,Hohai University | Sun G.,Hohai University | Sun Y.,Hohai University | And 2 more authors.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2015

Despite the overall consideration by the conventional optimal power flow (OPF) of the economy, safety and quality of power system, the OPF model is based only on the electric model to the neglect of the branch thermal model, which is a great deviation from the dispatch of an actual power system. On the basis of the theory of electric coordination and the relationship between resistance and temperature of the branch, a temperature-dependent OPF model with electro-thermal coupling is proposed. To further improve the efficiency of the algorithm, the electric model and thermal model are decoupled and then solved by the interior-point method. Finally, it is shown by the simulation results of IEEE 5-bus, Case 30-, 2736-, and 3012-bus of MATPOWER and actual 1856-bus test systems that the proposed model and method are successful and correct. ©2015 Automation of Electric Power Systems Press


Li G.,Northeast Dianli University | Tan L.,Northeast Dianli University | Wang Z.,Northeast Dianli University | Chen H.,Songyuan Power Supply Company
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2016

Because the upper and under bridge arm voltage of each phases are inconformity with each other based on MMC-HVDC, resulting in the internal circulation of converter. Circulation will cause each phase converter arm current distortion, so it is important to suppress the circulation. The usual method for inhibition circulation inhibits the internal circulation of converter under the normal operation condition. Firstly, it analyzes the method of inhibiting circulation under normal circumstances. Then, it focuses on the effects of unbalanced current under fault condition on the internal circulation and DC current through the AC system single-phase ground fault analysis and designs the additional controller to improve the traditional inhibition circulation strategy under fault conditions. Finally, it verifies the feasibility of theoretical analysis and improvement measures through the PSCAD/EMTDC simulation experiments. © 2016, Power System Protection and Control Press. All right reserved.

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