Shandong Power Dispatching Center

Jinan, China

Shandong Power Dispatching Center

Jinan, China
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Li H.,Shanghai University of Electric Power | You D.,Shandong Power Dispatching Center | Gao Y.,Qinhuangdao Power Supply Company | Shen L.,Qinhuangdao Power Supply Company | Wang Z.,Qinhuangdao Power Supply Company
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2013

A continuous method to calculate the Hopf bifurcation in small disturbance is presented. The second-order sensitivities of the selected eigenvalues with respect to loads variation which have more perfect linear behavior are computed and used to determine the step size of the continuation method. For lightly loaded conditions, it is expected that a small variation in the load would result in a small variation in the operation point which is far away from the HB point. Therefore, the step size could be larger. On the other hand, when the operation point is close to the HB point, a smaller step should be defined otherwise the HB point may be overleaped.

Wang H.,Shandong University | Liu X.,Shandong University | Chen Z.,North China Grid Company | Fang G.,Shandong Power Dispatching Center | Fu L.,Shandong Power Dispatching Center
Dianwang Jishu/Power System Technology | Year: 2013

To utilize the advantage of traditional universal generating function (UGF) method in fast and simple calculation and remedy the defect of dissatisfied accuracy of evaluation results by this method due to neglecting the influence of time-sequence in the application, based on improved traditional UGF method a probabilistic production simulation algorithm is proposed and applied in probabilistic production simulation of power system connecting with wind farm. Firstly, a method combining principal component analysis (PCA) with hierarchical cluster analysis is adopted to obtain typical time-sequential samples of wind power output; then a UGF model for wind power output is established by apportionment in average. During the establishment of the UGF model, by means of choosing proper common factor the state values are turned into integral multiples of common factor to effectively restrain the exponential growth of state number and alleviate the explosion of state number. Secondly, the UGF modeling of post-clustering time-sequential wind power output mode is performed to obtain time-sequential UGF model of wind power output, which can incarnate both fluctuation and uncertainty of wind power output, thus the insufficient representativeness of wind power features based on traditional UGF method due to neglecting time-sequence characteristic is overcome. Finally, the effectiveness of the proposed algorithm is verified by modified IEEE-RTS 79 system.

Li H.,Shanghai University of Electric Power | Jin Y.,Shanghai University of Electric Power | You D.,Shandong Power Dispatching Center | Zhu Z.,Shandong Electric Power Research Institute
Advanced Materials Research | Year: 2012

Hopf bifurcation is regarded as one of the three kinds of bifurcations which can cause voltage instability. The Hopf bifurcation was obtained if a pair of complex conjugate eigenvalues of Jacobian matrix crossing the imaginary axis. To calculate the critical eigenvalues of bulk power system, a restarted-refined Arnoldi method is introduced. The refined Ritz vectors are used as the approximations based on the refined projection theory in order to enrich the information of the eigenvectors in the projective subspace. Two examples indicate that the method can work out a set of conjugate eigenvalues which will show whether the Hopf bifurcation appears and provide the datum for the dynamic voltage stability analysis ulteriorly. © (2012) Trans Tech Publications, Switzerland.

Lei H.-Y.,North China Electrical Power University | Yu Z.-X.,Shandong Power Dispatching Center | Zhao Q.,North China Electrical Power University | Zhao C.-Y.,North China Electrical Power University | And 3 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

ased on the whole built electromagnetic transient model of Shandong grid in PSCAD environment, the article analyses the influence of commutation failure caused by different kinds of short circuit faults of AC lines in different locations on AC system fault transient response characteristics. Considering the actual installation of line protections in Shandong power grid, the models of three kinds of line protection are built by Fortran, i.e. RCS901(directional protection based on variation of power frequency components), PSL602 (pilot distance protection) and RCS931(differential protection). Then the influence on line protections near Qingdao converter station is studied after the operation of ±660 kV HVDC transmission project between Ningxia and Shandong in 2010. The simulation results show that the current in the parallel line of fault line distorts greatly during HVDC commutation failure and the distortion is the most serious when the single-phase grounding short-circuit fault occurs in the middle of the line. Moreover, directional protection for non-fault line which is in parallel with fault line is affected greatly, while the effect on the other two protections is less.

Wang H.,Shandong University | He C.,Shandong University | Fu L.,Shandong Power Dispatching Center
DRPT 2011 - 2011 4th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies | Year: 2011

This paper study the power system restoration procedure with external power supplies through HVDC transmission channel. The simplified models of the transmission system under different control modes are established and their stability margin are analyzed by root locus diagram. In consideration of the influence of the short circuit capacity and rotating inertia of power grid at sending end on the stability of HVDC control system, selection and coordinated strategies of HVDC control modes are given during different stages of system restoration. The procedure of power system restoration with HVDC supporting include two phases, phase I is DC line connecting to weak AC system in the receiving end and phase II is load picking up with HVDC power supporting. In phase I, the adaptability of general HVDC control modes are analyzed, and the appropriate control modes are given. In phase II, the control modes transfer strategies are given under large voltage declining during the receiving end AC system is weak. In both of the two phases, detailed stability analysis are carried out for checking the key controller parameters setting. For accelerating load restoration, the amount of load that can be restored once a time for different short circuit capacity of power grid at sending end and receiving end is analyzed. Last, the effectiveness of HVDC stability mechanism analysis is validated by the simulation of Ningdong-Shandong HVDC system using PSCAD/EMTDC. © 2011 IEEE.

Wang H.,Shandong University | He C.,Shandong University | Fang G.,Shandong Power Dispatching Center | Fu L.,Shandong Power Dispatching Center
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2011

The difficulty of integrating wind power into the grid increases with the wind power penetration level growing continuously. The prediction error of wind farm output is relatively large, and it varies with the prediction cycle and output level; therefore, different reserve capacities are needed to balance power supply and load demand. To solve the above issues, a gradual optimization method of day-ahead and within-day dispatching schedules is presented. The wind power and predication error band are involved during the implementation of dispatching schedules, and the last dispatching schedules are adjusted according to the latest predication messages to improve the accuracy of dispatching schedules gradually. The adjustments include the output power and reserve capacities of conventional generators. The proposed model is verified on IEEE 30-bus system with a wind farm. Compared to the day-ahead dispatching model, the proposed model can reflect the impact of wind power predication error on dispatching schedules more effectively, and the reserve capacities can be adjusted accordingly. ©2011 State Grid Electric Power Research Institute Press.

Wang H.,Shandong University | Yuan S.,Shandong Power Dispatching Center | Qiu X.,Shandong Power Dispatching Center | Fang G.,Shandong Power Dispatching Center | And 2 more authors.
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2010

Since the current power system black-start lacks the effective mechanism to maintain and continuously improve, an experiment management mechanism with PDCA pattern is proposed, which guides Shandong power grid black-start experiment according to three principles of risk driven, accident priority control and continuous improvement. During the planning stage, three risk factors were detected and removed: the abnormal parameters of pumped-storage unit under low load, the imperfect DC power for breaks and the difficulty of subsystem synchronization and paralleling. The doing stage is implemented in four steps: mode adjustment, unit shutdown, black-start test and subsystem restoration. During the checking stage, the black-start ability of pumped-storage unit and large thermal power unit is analyzed with recorded test data and the test objectives are fully verified. In the action stage, the original black-start scheme was revised and the test plan and dispatch scheme were developed for next cycle. Following the PDCA pattern, the high-risk big-cost and widely-involved experiment has realized the closed-loop emergency management by feedforward control, concurrent control and feedback control to ensure the smooth and successful implementation of black-start experiment.

Yu Z.-X.,Shandong Power Dispatching Center | Zhu Q.-R.,Shandong Power Dispatching Center | Zhao C.-Y.,North China Electrical Power University | Zhang R.-L.,North China Electrical Power University | Wei P.-J.,North China Electrical Power University
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

Ningdong-Shandong HVDC project will be put into operation, which is a challenge to the security and stability of Shandong power grid, so it becomes more important to research AC-DC system interaction. In PSCAD environment, the electromagnetic transient simulation model of Shandong power grid is established, including the simplified modeling of Shandong AC system and the detail modeling of Ningdong HVDC system. Based on the DC model, the static responses characteristics and transient response characteristics under common faults of DC transmission system are simulated and analyzed. The simulation results show that control system of HVDC transmission system has steady and fast response characteristics and also verify the correctness and validity of the established model. The power flow distribution in Shandong power grid and three phase short circuit currents of the bus in main stations are adjusted and checked to ensure that the data generally agree with the corresponding data in PSASP environment and the steady-state and dynamic characteristics of the established model are nearly the same as those in actual network.

Liu X.,Shandong University | Liu Y.,Shandong University | Qiu X.,Shandong Power Dispatching Center
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2012

The influence of Yindong 660 kV DC block fault on power system stability in the initial stage of UHV AC project is analyzed. It is proposed to shed part of Shandong Power Grid loads after the DC bi-polar block to reduce the power transmission from Central China Power Grid to North China Power Grid for system instability prevention. The corresponding load shedding control system is designed, which computes the loads to be shed in real time according to the operating condition of power grid and selects the proper substations for load shedding based on the nature of loads. Compared with the bisection method, the critical shedding load search based on the string cut method more rapidly determines the loads to be shed in Shandong Power Grid after DC block fault.

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