Central China Electrical Power Dispatch and Communication Center

Wuhan, China

Central China Electrical Power Dispatch and Communication Center

Wuhan, China
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Jiang M.,Tsinghua University | Wu W.,Tsinghua University | Zhang B.,Tsinghua University | Sun H.,Tsinghua University | Li X.,Central China Electrical Power Dispatch and Communication Center
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2010

Automatic generation control (AGC) system is used to achieve load and generation balance by maintaining the system frequency and the tie line flows at their scheduled values. In order to mitigate the power fluctuations on the ultra-high voltage (UHV) tie-line, a coordinated control strategy between regional and provincial regulating zones is presented. In this strategy, the outputs of regional and provincial units are adjusted according to the power deviation of the UHV tie-line. Under normal conditions, the regional units act to mitigate the power fluctuations on the UHV tie-line when the power deviation is large and reset to scheduled value in advance when the power deviation is small. A compensation control strategy is proposed as well, in which the regional regulator is driven to balance the load disturbance if the AGC capacity of provincial regulator is insufficient. The numerical simulation results show that the proposed method works well under normal and emergency conditions of UHV AC interconnected power system. © 2010 State Grid Electric Power Research Institute Press.


Liu L.,Wuhan University | Lin T.,Wuhan University | Xu X.-L.,Central China Electrical Power Dispatch and Communication Center
Gaodianya Jishu/High Voltage Engineering | Year: 2011

The complex atom function (CAF) that owns flexible filter control feature is constructed by utilizing scalar to modulate the orthogonal triangular basis with the Gauss window. The time and frequency domain band width of CAF can be adjusted according to the requirements, meanwhile independent of the central frequency. Firstly, compact frequency band width and short observation time window are set in terms of the Gauss window radius formula. Then, the subsynchronous oscillation (SSO) modes are detected by CAF filtering. Subsequently, the amplitude, frequency and damping are extracted from the complex phasor which is the output of the previous filtering. It is demonstrated by the final simulation that the proposed method which keeps good timeliness can make the accurate measurement of the fundamental phasor, SSO and SSR parameters with high mode solution and short calculation window, simultaneously overcome the effect of noise and other components.


Hong F.,Huazhong University of Science and Technology | Chen J.,Huazhong University of Science and Technology | Duan X.,Huazhong University of Science and Technology | Xi J.,Central China Electrical Power Dispatch and Communication Center | And 3 more authors.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2011

The peak value of tie line oscillation power in the weak interconnection bulk power grids following large disturbances (generator tripping, DC blocking) was discussed based on the interconnected power system of North China and Central China. The characteristics of tie line oscillation were analyzed based on the real power grid. The maximum oscillation power value was deduced on two-machine system and analyzed the relative factors of influencing the power peak value of the tie line. It's pointed out that the peak value of oscillation power is proportional to the abrupt change of electromagnetic power and is inversely proportional to the ratio of the rotational inertia of the fault grid to the other side grid. The difference of abrupt change of electromagnetic power is closely related with the location of faults, therefore, the closer the distance between the fault location and tie line impact point, the smaller the transfer ratio. The conclusions were verified by the calculation results of the measured data of the tie line of North China and Central China interconnected power system. © 2011 Chinese Society for Electrical Engineering.


Shi D.,Huazhong University of Science and Technology | Luo G.,Huazhong University of Science and Technology | Chen J.,Huazhong University of Science and Technology | Duan X.,Huazhong University of Science and Technology | And 3 more authors.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2012

The rapid and accurate calculation of available transfer capability (ATC) is beneficial for operating and dispatching a bulk interconnected grid. Considering several influencing factors, this paper presented a fast algorithm for the calculation of ATC which is applicable in bulk interconnected grid. This calculation framework was based on the repeated power flow (RPF) method with optimizing the process of calculation as well as improving its speed. This paper has considered static constraints and dynamic constraints comprehensively. Based on the analysis of impact of different power incremental directions on ATC, three practical directions and their calculation methods were provided respectively. Furthermore, transient stability risk assessment was introduced to work out the ATC when certain instable risks appear in system. The application of developed software in practical power grid verifies the validity and applicability of the proposed approach. © 2012 Chin. Soc. for Elec. Eng.

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