Guizhou Power Grid Corporation
Guizhou Power Grid Corporation
Jinsen L.,Guizhou Power Grid Company Ltd |
Lijuan L.,Guizhou Power Grid Company Ltd |
Sibin L.,Guizhou Power Grid Company Ltd |
Yan Z.,Guizhou Power Grid Company Ltd
International Journal of Grid and Distributed Computing | Year: 2016
The current investment and management mode of power grid construction project is inadequate to the whole optimization, the overall process of the project has obvious time-phased, therefore, the paper strongly advocates to carry out life-cycle management in power grid construction project, and divides the construction project into five stages as preliminary planning, design and planning, construction and operation, scrap and disposal, and evaluate and control the cost of operating stage, investment benefit of decision stage, design stage management and risk of construction stage, and sets up performance evaluation model of power grid project, in order to provide certain practical significance for the establishment of life-cycle management mode of power grid enterprises. © 2016 SERSC.
Han D.,University of Shanghai for Science and Technology |
Sun W.,University of Shanghai for Science and Technology |
Fan X.,Guizhou Power Grid Corporation Ltd
International Journal of Electrical Power and Energy Systems | Year: 2018
A crucial issue in the smart grid is how to manage the controllable load resources of end-users, in order to reduce the economic costs of system operation and facilitate to utilize renewable energies. This paper investigates a fast randomized first-order optimization method to explore the solution of dynamic energy management (DEM) for the smart grid integrated large-scale distributed energy resources. A complicated time-coupling and multi-variable optimal problem is presented to determine the load scheduling for the electricity customers. The main challenge of the proposed problem is to enable the efficient processing of the large data volumes and optimization of aggregated data involved in DEM. The first-order method as one of big data optimization algorithms is able to exhibit significant performance for computing globally optimal solutions based on randomization techniques. Using such solution approach, we can reformulate the original problem into an unconstrained augmented Lagrangian function. The optimal results can be obtained from computing the gradient based on the information of the first-order derivative. To speed up the calculations of obtaining the feasible solutions, the optimization variable matrix used to update the Lagrangian multiplier can be replaced with the corresponding low-rank representation in the iteration process. Both theoretical analysis and simulation results suggest that the proposed approach may effectively solve the optimal scheduling problem of DEM considering users’ participation. © 2017 Elsevier Ltd
Zhang G.,Shanghai JiaoTong University |
Wang X.,Shanghai JiaoTong University |
Jiang C.,Shanghai JiaoTong University |
Zhang Y.,Guizhou Power Grid Corporation |
Wang Z.,Shanghai JiaoTong University
Dianwang Jishu/Power System Technology | Year: 2016
At present, distributed generations (DGs) are widely used in electric power systems. Due to low capacity and widespread locations, DGs are hard to manage. However, by setting up virtual power plant (VPP) operation center, this problem can be well solved. Through independent system operator (ISO) and VPP's proper bi-level optimization dispatch, all DGs can be equivalent to a virtual power plant, taking part in electricity market and promoting net profit of each individual. By introducing wind curtailment punishment into objective functions of bi-level optimization dispatch model, renewable energy is integrated into power system more effectively. To indicate VPP's internal dispatch advantage, an example was used to illustrate it. Based on analysis of different VPP's capacity ratios in whole system, its influence on VPP's and each individual's net profit was calculated and compared. Examples indicated that bi-level optimization and proper VPP's capacity ratio could play an important role in improving VPP's profit. © 2016, Power System Technology Press. All right reserved.
Li Y.,Chongqing University of Posts and Telecommunications |
Liao C.,Guizhou Power Grid Corporation |
Wang Y.,Chongqing University |
Wang C.,InterDigital Communications
IEEE Transactions on Wireless Communications | Year: 2015
Both capacity and energy efficiency are crucial for next-generation wireless networks. This paper investigates energy efficiency in cooperative cellular networks. Based on the double auction theory, we model the optimal relay assignment problem, which aims at improving the performance of cell-edge users (CEUs) with energy efficiency optimization. In the proposed auction-based model, the selfish nature of users is taken into consideration, which means users in the idle state are unwilling to relay the information for active CEUs unless they are paid enough. Therefore, we use mark-up to determine the bid and ask. Furthermore, the energy efficiency (EE) is defined and the model for optimizing the EE is built. An energy-efficient maximum weighted matching algorithm (EE-MWM) is proposed to solve the EE optimization problem. Finally, the performance of EE-MWM is evaluated in terms of EE, capacity and social welfare, which shows that EE-MWM can greatly improve the performance of cooperative cellular networks. © 2002-2012 IEEE.
Li Q.,Guizhou Power Grid Corporation |
Zhang D.,Guizhou University |
Xu T.,Guizhou University
Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology, EMEIT 2012 | Year: 2012
With the method of modal analysis, the full Jacobian according to the power system power flow equations is studied and a method to identify the suitable bus for loading shedding is proposed in this paper. The proposed method makes use of the participation factors corresponding to the active power, by which the structural characteristic of the power system nonlinearity is included. As a result, the effective bus where the load shedding should be used can be found. In order to show the effectiveness of the proposed method, the WSCC 9-bus power system is used as an example. The simulation results indicate that with the load shedding at the place where the proposed method decided, the voltage stability indices are considerably increased. The proposed method in this paper is effective. © the authors.
Deng P.,Guizhou Power Grid Corporation |
Liu X.,Guizhou University |
Pi X.,Guizhou Power Grid Corporation |
Wang F.,Guizhou Power Grid Corporation |
Liu K.,Duyun Electrical Power Bureau
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2016
For the reasonable series reactance rate in capacitor of substations, the full parametric harmonic circuit and model for 220 kV and 110 kV substations are established, which consists of short impedance, transformer, capacitor, load, and harmonic source, and the resonance objective function that reflect the degree of resonance such as harmonic voltage amplification factor on load bus, etc. is given. With minimax optimization, the maximum values of objective function in all the power grid parameter space are minimized by changing reactance rate, and the technical and economic characteristics of the reactance rate of the capacitor are analyzed. The calculation results show that resonance is eliminated with best effect and generality by the rate 12%; resonance is eliminated with second effect by rate 4.2% ~ 4.5%, but the rate 4.2% ~ 4.5% one has better technical and economic value and is suitable for most of 220 kV and 110 kV substation. © 2016, Power System Protection and Control Press. All right reserved.
Fan A.,Pingdingshan University |
Yang Z.,Pingdingshan University |
Chang Q.,Guizhou Power Grid Corporation |
Xie L.,Pingdingshan University
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2013
In order to solve the problem of security of data transmission in the electric power dispatching system, the characteristic of high efficiency of the elliptic curve cryptosystem (ECC) calculation is made use of, and a certificateless signature scheme based on ECC without pairing is put forward. Based on the security of the discrete logarithm problem, the private key pair and public key pair are co-produced by the dispatching center and dispatching users to avoid the drawbacks of complex certificate management in the electric power dispatching system. Based on the realization of the idea without pairing, the ECC calculating method is used to improve the efficiency of the implementation of the security dispatch. The scheme is not only characterized by integrity, anti-denying, anti-forgery, verification of signature and dispatching identity, but also can meet the requirement on real-time transmission for the electric power dispatching system. © 2013 State Grid Electric Power Research Institute Press.
Zhang B.-B.,University of Sichuan |
Qiu X.-Y.,University of Sichuan |
Liu N.,University of Sichuan |
Sun B.,Guizhou Power Grid Corporation |
And 6 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2013
Aiming at the question of balancing the fluctuating photovoltaic grid-connected generation system, a hybrid energy storage-based grid-connected PV power system model is proposed to overcome the fluctuation of grid-injected power caused by the change of illumination intensity and temperature. An ultracapacitor-battery based energy storage control system is employed to smooth the fluctuation of grid-injected power caused by the change of various weather conditions. A new method to track the maximum power point is proposed to modulate the maximum output power of PV system more stably and instantly, and it can also improve the power generation efficiency. Finally, this model is tested by using Matlab/Simulink. The result proves that the hybrid energy storage-based control system can efficiently improve the stability of PV grid-injected power.
Fan A.-W.,Pingdingshan College |
Chang Q.,Guizhou Power Grid Corporation |
Lu S.-X.,Pingdingshan College
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2012
Targeting at the security problem of the electrical dispatching system, the ECC (Elliptic Curve Cryptography) Sequential Multiple Digital Signature Scheme based on electrical dispatching system is put forward. The confidence center is authenticated by means of zero-knowledge, the identification of signature and validity has been processed by Hash, to avoid the attack of identification switch and ensure the integrity of signature. Compared with similar algorithm, it is characterized with anti-denying, anti-forgery, verifiability of integrity of signature. It will avoid the security problem resulted from transferring message by plaintext, insure the integrity of massage and verifiability of legitimate operating tickets and solve the security problem of electrical dispatching system. The application test shows that the algorithm will meet the requirement of real-time for electrical dispatching system.
Li L.,Chongqing University |
Li L.,Hubei Electric Power Company |
Hu B.,Chongqing University |
Xie K.,Chongqing University |
And 2 more authors.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2016
Firstly, imbalance power in isolated microgrids has been analyzed. Based on discrete Fourier transform (DFT), the imbalance power is decoupled into day and hour components, which can be balanced by compressed-air energy storage and sodium-sulfur cell, respectively. In order to obtain the optimal components, the DFT segmentation principle is studied. By considering investment and operating cost including energy storage, loss of load and wind abandoning penalty comprehensively, the capacity optimization model of hybrid storage systems for isolated microgrids is built. This model can simultaneously optimize the DFT segment point and the hybrid energy storage capacity. And its solving complexity has been greatly simplified as the model can thoroughly decouple the configuration optimization of compressed-air energy storage and sodium-sulfur cell. Finally, the correctness of the model and the method has been verified in a certain practical microgrid. © 2016 Automation of Electric Power Systems Press.