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Wang X.,Shandong University | Wang C.,Shandong University | Zhou X.,Shandong University | Yang Z.,Shandong University | Yang Z.,Integrated Electronic Systems Laboratory Co.
Journal of Information Processing Systems | Year: 2017

This paper proposes a color image coding algorithm based on shape-adaptive all phase biorthogonal transform (SA-APBT). This algorithm is implemented through four procedures: Color space conversion, image segmentation, shape coding, and texture coding. Region-of-interest (ROI) and background area are obtained by image segmentation. Shape coding uses chain code. The texture coding of the ROI is prior to the background area. SA-APBT and uniform quantization are adopted in texture coding. Compared with the color image coding algorithm based on shape-adaptive discrete cosine transform (SA-DCT) at the same bit rates, experimental results on test color images reveal that the objective quality and subjective effects of the reconstructed images using the proposed algorithm are better, especially at low bit rates. Moreover, the complexity of the proposed algorithm is reduced because of uniform quantization. © 2017 KIPS.

Liu Y.,University of Jinan | Sun T.,Integrated Electronic Systems Laboratory Co.
Dianwang Jishu/Power System Technology | Year: 2016

Computation burden of non-recursive Fourier algorithm is well-known heavy, limiting its application in numerical relays. Although recursive form of Fourier algorithm reduces computation burden greatly, errors caused by finite word-length effect and truncated data bits seriously affect accuracy and long-term stable operation because the errors will be cumulated step by step. Based on sources and characteristic analysis of cumulative errors mentioned above, the paper proposes an improved method calculating alternatively using recursive and non-recursive forms to minimize cumulative errors. Moreover, employing distribution and synchronous calculation technology for weighted product terms, the improved method maintains inherent advantages of recursive algorithm, whose calculation amount only increases 2 additions compared with continuous recursive algorithm. The proposed method is applied in busbar protection and substation-area protection for smart substation requiring access of large number of analog channels. Digital simulation and prototype long-term running experiments show that the improved method can effectively reduce cumulative errors and drastically decrease computation burden in comparison to non-recursive algorithm. © 2016, Power System Technology Press. All right reserved.

Liu Y.,Shandong University | Liu Y.,Integrated Electronic Systems Laboratory Co. | Gao H.,Shandong University | Gao W.,Shandong University
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2011

A novel approach to data processing for relay protection is proposed based on analysis of basic requirements of data processing in digital substation. The new scheme involves three major steps, applying the Fourier algorithm immediately to equal-interval sampling data from merging unit, amending the sine/cosine items in accordance with the real-time frequency, and finally acquiring the signal's true root mean square value and phase. The new scheme not only obtains high precision frequency with the phase-shift-cycle measurement algorithm, but also adapts to phasor based protection without using interpolation or sampling rate conversion. The concrete implementation of novel data processing approach and related issues (e. g. how to deal with startup with sampled values) are given in detail. The feasibility and validity of proposed approach have been verified with ATP based simulation. © 2011 State Grid Electric Power Research Institute Press.

Qi L.,Shandong University | Wang C.,Shandong University | Zhou W.,Integrated Electronic Systems Laboratory Co. | Yang Z.,Integrated Electronic Systems Laboratory Co.
DRPT 2011 - 2011 4th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies | Year: 2011

This paper explores Free and Open Source (FOS) Geographical Information System (GIS) with multi-platform feature applicable in distribution Supervisory Control and Data Acquisition (SCADA) providing lightweight GIS functions. To realize the complete integration of GIS and SCADA, a scheme is proposed to develop distribution SCADA applications based on FOS GIS. An evaluation is carried out to several FOS desktop GIS projects using a formal method and by the utilization of test installations. The results show that uDig which is built with Eclipse Rich Client Platform (RCP) is suitable to be the base platform. Moreover it is flexible to make secondary development. The user interface of distribution SCADA is directly developed on GIS platform making use of the same distribution network model to draw both GIS based feeder maps and electric diagrams on the basis of the graphic architecture of uDig. The distribution network model is in accordance with Common Information Model (CIM) in IEC61970. System designed in the proposed scheme is convenient to integrate with other power utilities. © 2011 IEEE.

Zhao H.,Shandong University | Wang X.,Shandong University | Yang Z.,Integrated Electronic Systems Laboratory Co.
DRPT 2011 - 2011 4th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies | Year: 2011

With the development of digital substation, the devices of the substation put forward higher demands on clock synchronization. The standard of the IEEE1588 provides a protocol that enables precise synchronization of clocks in measurement and control systems, and the precision of its network is sub-microsecond level which can satisfy the need of clock synchronization of the substation. This paper makes a brief analysis of the principles of clock synchronization and the protocol state machine, and achieves the clock synchronization by programming. Under the Linux operating system, the design of software contains the protocol engine module, transmission control module and receipt control module. Eventually it is transplanted into the platform of ARM9 and tested. The results show that the precision of time synchronization this paper designed can meet the requirements of the synchronous units of digital substation. © 2011 IEEE.

Qi M.,Shandong University | Wang X.,Shandong University | Yang Z.,Integrated Electronic Systems Laboratory Co.
DRPT 2011 - 2011 4th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies | Year: 2011

IEEE1588 is a Precise Time Protocol (PTP), which is of potentially wide application in control and measurement networks. Stamping PTP messages accurately in physical layer taking advantage of hardware circuits, it is one of important key technologies to achieve the object of high precision time synchronization of IEEE1588. This paper analyzes the content of IEEE1588 standard in detail, and proposes a method of "Cyclone II FPGA + MAC + PHY", a hardware solution that stamps the time of PTP messages' arrival and departure. It permits to obtain messages from Media Independent Interface (MII) between MAC and PHY layers by using "DM9000 + LXT971A", while FPGA monitors these signals and timestamps synchronization messages. To validate the solution, a test platform was built. The result shows that the solution can detect the sent and received synchronization messages accurately. This work laid a solid foundation for developing high-precision network clock based on the IEEE1588 standard. © 2011 IEEE.

Liu Y.,Shandong University | Liu Y.,Integrated Electronic Systems Laboratory Co. | Gao H.,Shandong University | Wei X.,Integrated Electronic Systems Laboratory Co. | And 2 more authors.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2011

The intelligent reconstruction of conventional substation needs to add process level device and to reconstruct bay level device so that causes complicated working and uneconomic for medium and low voltage bay. A distributed configuration scheme of secondary devices using intelligent electronic device (IED) with integrated functions for process level and bay level is presented. Based on the new scheme, a new type of integrated IED is designed, which completely implements merging-unit, intelligent-terminal, measurement-control and protection functions in one physical apparatus. The integrated design scheme and software-hardware architecture of the integrated IED is described, which is composed of four dominating parts: PowerPC main processor modular, digital signal processor (DSP) data processing module, field-programmable gate array (FPGA) integrated processing module and breaker intelligent control module. Several related issues are discussed in detail, including the design of sampled value data stream, rapid processing of generic object oriented substation event (GOOSE) and the design of measurement-control and protection function. Finally, the information model of the integrated IED is established according to IEC 61850 standard. In conclusion, the integrated IED, which is cost effective with reasonable design and superior performance, can effectively simplify the intelligent reconstruction of conventional medium and low voltage substations. © 2011 State Grid Electric Power Research Institute Press.

Wang X.-L.,University of Science and Technology of China | Wu Z.-H.,Integrated Electronic Systems Laboratory Co.
Communications in Theoretical Physics | Year: 2014

Using an improved homogeneous balance principle and an F-expansion technique, we construct the new exact periodic traveling wave solutions to the (3+1)-dimensional Gross - Pitaevskii equation with repulsive harmonic potential. In the limit cases, the solitary wave solutions are obtained as well. We also investigate the dynamical evolution of the solitons with a time-dependent complicated potential. © 2014 Chinese Physical Society and IOP Publishing Ltd.

Bu Q.,Qingdao University | Wang J.,Integrated Electronic Systems Laboratory Co.
Proceedings of 2014 4th IEEE International Conference on Network Infrastructure and Digital Content, IEEE IC-NIDC 2014 | Year: 2014

In the paper, a kind of novel video summarization extraction method based on cooperative video communication network is proposed. And based on the cross-layer design, the performance of video summary transmission nover cooperative wireless communication for Rayleigh, Rician, Nakagami channels was conducted. Good performance of video summary delivery over different wireless environment was proved. © 2014 IEEE.

Yuan W.-G.,Integrated Electronic Systems Laboratory Co. | Zhou W.-J.,Integrated Electronic Systems Laboratory Co. | Li C.-J.,Integrated Electronic Systems Laboratory Co.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2012

This paper studies the application of the SOA architecture in the distribution automation system. According to the characteristic and demands of distribution automation system, a real-time SOA architecture is put forward. By improving the realization technology of the SOA, including the multicast and P2P technology, the new architecture can satisfy the real-time demand of distribution automation system. To improve the reliability of the distribution automation system, the real-time SOA uses the same service named for redundancy backup technique. The new SOA architecture integrates the real-time SOA and IEC standard by bus-adapter to easily realize the cross-platform feature and the flexibility "plug and play" in distribution automation system. The overall architecture of real-time SOA of distribution automation system is given in the end. The practical application shows that the real-time SOA architecture can meet the real-time demand and still keep the characteristics of openness of SOA.

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