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Tao L.,Tianjin Electric Power Research Institute
Applied Mechanics and Materials | Year: 2014

This paper designs and discusses black-start scheme based on a gas-steam combined cycle power plant (CCPP) in Tianjin power grid of China. First, considering the structure characteristics and station service power connection mode of the gas-steam unit, the diesel generator is chosen as fast self-starting unit. Also two self-starting schemes of direct starting and variable frequency starting are designed. Second, the technical feasibility of two schemes is determined through first loading capability test and bus voltage level test. After investment estimation comparison, the scheme II is chosen as recommended scheme. The research process proposed in this paper has certain reference significance to power grid black-start. © (2014) Trans Tech Publications, Switzerland.

Xu Q.,Nanjing Southeast University | Zeng A.,Nanjing Southeast University | Wang K.,Nanjing Southeast University | Jiang L.,Tianjin Electric Power Research Institute
Dianwang Jishu/Power System Technology | Year: 2016

Micro energy-grid contains four forms of energy: cold, heat, electricity and gas, possessing features of diversified load forms and energy supply devices. After modeling of a variety of energy supply and storage devices, this paper proposed an energy supply infrastructure for combined cooling heating and power (CCHP)-based micro energy-grid based on centralized and interconnected energy exchange network. Loads are subdivided into pure electricity, hot water, space heating, refrigeration and space cooling. Optimized economic dispatching model of CCHP-based micro energy-grid is established according to the infrastructure. The model is solved with interior point method with Hessian matrix iteration. Study case shows that the dispatching method can achieve optimized economic operation of micro energy-grid by reducing operation cost remarkably through controlling operation mode and output of energy supply and storage equipment. Rational dispatching method confirms correctness and validity of the proposed model and solving method. © 2016, Power System Technology Press. All right reserved.

Wang X.,Tianjin Electric Power Research Institute | Lin J.,Tongji University | Li S.,Shanxi Electric Power Research Institute | Zheng W.,State Grid Corporation of China
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2013

Islanding operation is a special operation mode in the smart grid. For a power transmission system, if a connected system is split into several stable islanding sub-systems in time in the optimal islanding operation mode in case of extreme emergency, not only will enormous losses due to large area blackout or even system collapse caused by the spread of the local fault be avoided, but the amount of load shedding and generator tripping might be minimized as well. For a distributed system with distributed generator (DG), optimum islanding operation can bring the potential of DG into full play, while improving the reliability of power supply. The influencing factors of the optimal island partitioning in the smart grid are summed up and all the relevant methods and strategies available at home and abroad are thoroughly analyzed and classified. And the advantages and disadvantages along with key issues of each method are also discussed. Finally, the development tendency and the problems demanding prompt solution are treated. © right.

Wang F.,Shanghai JiaoTong University | Qi Y.,Tianjin Electric Power Research Institute | Fu Z.,Shanghai JiaoTong University
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2012

The reliability of the distribution system with a microgrid (DSM) is evaluated using the modified minimal path searching algorithm based on the network space topology in which the power control mode, network configuration and operation characteristics of the microgrid are fully considered. The positive effect of the microgrid on the distribution system reliability is analyzed from the reliability aspect. The results of the IEEE RBTS bus 6 using this model have verified the validity of the model showing the remarkable effect of the microgrid on increasing the reliability of the distribution system. © State Grid Electric Power Research Institute Press.

Gan Z.,Tianjin Electric Power Research Institute
IEEE Transportation Electrification Conference and Expo, ITEC Asia-Pacific 2014 - Conference Proceedings | Year: 2014

The advanced smart grid sensing measurement technology, information and communication technology, analysis and decision technology, automatic control technology and grid technology, and a high degree of integration with grid infrastructure, the power grid is the future direction of development. Through the use of advanced smart grid technology, electric vehicle charging behavior of a reasonable adjustment to achieve fully meet electric vehicle charging, while reducing the impact of electric vehicle charging on the grid, so as to realize the coordinated development of electric vehicles and smart grid. © 2014 IEEE.

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