Hubei Electrical Power Dispatching and Communication Center

Wuhan, China

Hubei Electrical Power Dispatching and Communication Center

Wuhan, China
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Qin Z.,University of Hong Kong | Hou Y.,University of Hong Kong | Liu S.,EPRI | Yan J.,Ecomonic Study Group | Li D.,Hubei Electrical Power Dispatching and Communication Center
Proceedings - 2014 Power Systems Computation Conference, PSCC 2014 | Year: 2014

This paper proposes an optimization model to compute optimal load restoration plan for the transmission network. The objective of this model is to maximize the load pickup subject to power flow constraints and discrete load increment constraints. This mix-integer optimal power flow model (MIOPF) is solved via a branch-and-cut (B&C) framework. The nodes in the B&C tree are solved by the interior point method. In particular, three cutting planes, namely, the Gomory rounding cut, the knapsack cover cut, and the fixing variable cut, are incorporated into each node of the B&C tree to reduce the scale of the sub-tree. This model can be used to aid the system operators to conduct load restoration actions or draw up a restoration plan. The load restoration plan is obtained by solving a number of co-related MIOPF models till all load increments are restored. The RTS 24-bus test case with 170 load increments (i.e., with 170 binary variables) is used to illustrate complexity of the proposed model and the computational efficiency improvement stemming from the cutting planes. © 2014 Power Systems Computation Conference.


Qin Z.,University of Hong Kong | Hou Y.,University of Hong Kong | Li D.,Hubei Electrical Power Dispatching and Communication Center | Wang C.,University of Hong Kong | And 2 more authors.
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2016

This paper proposes an optimization based method to construct load restoration strategy for transmission systems. Firstly, the load restoration process is divided into a sequence of co-related steps. In each step, the total amount of load pickup is restricted by the synchronized generation and the operational constraints of each generator. The objective in each step is to maximize the load pickup. Secondly, the maximum load pickup problem is formulated as a mixed-integer nonlinear load restoration (MINLR) model and solved via a branch-and-cut (B&C) framework. The Gomory rounding cut, the knapsack cover cut, and the fixing variable cut are incorporated into each node of the enumeration tree to reduce the scale of the sub-trees. Thirdly, the load restoration strategy is obtained by solving a number of MINLR models till all load increments are restored. The RTS 24-bus system and the IEEE 118-bus system are used to illustrate the efficiency of the proposed method. © 2016, The editorial office of Transaction of China Electrotechnical Society. All right reserved.


Chen X.,Huazhong University of Science and Technology | Sun H.-S.,Huazhong University of Science and Technology | Sui X.-C.,Huazhong University of Science and Technology | Wen J.-Y.,Huazhong University of Science and Technology | And 4 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

The two-dimensional control domain of the ultra-high voltage (UHV), formed by the two terminal bus voltage, is commonly calculated by using existing UHV infinite equivalent potential source method, which will lead to decrease of voltage along the UHV line after switching the capacitive reactive power compensation devices. It's found that the minus equivalent reactance on the medium-voltage side winding of the transformer is the main reason. Hence, a novel equivalent potential source method is proposed for the control domain calculation, in which the Central China grid and North China grid systems are modeled as the equivalent potential sources with inner impedance respectively. Comparing with the bus voltage method, the proposed method can not only eliminate the reverse moving of the control domain but also develop a three-dimension voltage control domain formed by line power and two-terminal bus voltage by taking into account of the variation of the transmission power variation.


Chen X.,Huazhong University of Science and Technology | Sun H.-S.,Huazhong University of Science and Technology | Sui X.-C.,Huazhong University of Science and Technology | Wen J.-Y.,Huazhong University of Science and Technology | And 4 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

In view of fewer index on evaluating the partition results quantitatively, this paper proposes an area coupling index for quantitative evaluation of partition results based on the coupling between node voltage and reactive power, as well as a node-area coupling index intended for selecting the pilot node of an area. A comprehensive voltage and reactive power VQ coupling degree hierarchical control method is then established combining the partition, results evaluation with voltage control through node fuzzy clustering. The proposed method has been applied to Hubei power grid, and it can be concluded that the areas partitioned by such method have strong independence, the area reactive power disturbance exerts larger influence on the local area voltage, but smaller influence on other areas, and the proposed coupling degree index has clear definition, simple calculation and strong practicability.


Sun J.-B.,Hubei Electrical Power Dispatching and Communication Center | Yi C.-Y.,Hubei Electrical Power Dispatching and Communication Center | Zhang B.-H.,Huazhong University of Science and Technology
Advanced Materials Research | Year: 2013

The decomposition scale value is usually given by experience while the wavelet analysis method is used for daily load forecasting. Directed to the influence of decomposition scale, the paper constructed a level-termination function as SNR and put forward a constraint conditions according the accuracy requirement to solve out the optimal decomposition level. Then followed the load data which was decomposed into high and low frequency component, built up different models for different level series and sum up the forecasting result. The accuracy assessment index shows the effectiveness of the whole method and prediction thought. © (2013) Trans Tech Publications, Switzerland.


Miao X.-G.,Wuhan University of Science and Technology | Zhang B.-H.,Wuhan University of Science and Technology | Li Z.-C.,Wuhan University of Science and Technology | Wu J.-L.,Wuhan University of Science and Technology | And 5 more authors.
Advanced Materials Research | Year: 2013

Based on power system stabilizer (PSS) and the damping controller of flexible AC transmission system (FACTS), a problem of optimal design is researched by the example of static var compensator(SVC). Minimum damp ratio of system electromechanical oscillation modes eigenvalue in the weak damping operation condition is selected as the object function. Parameters of damping controllers are optimized by the algorithm which is combined by genetic algorithm (GA) and back propagation (BP) neural network based on adaboost (Ada-BP). Simulation shows the optimized damping controllers can restrain the low frequency oscillation in multi-operating conditions of system. The algorithm provides an effective solution for optimization calculations which calls the complicated calculations. © (2013) Trans Tech Publications, Switzerland.

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