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Li Y.,North China Electrical Power University | Li Y.,North China Baoding Electrical Power Voc And Technology College | Ma J.,North China Electrical Power University | Ma J.,Xian Jiaotong University | And 4 more authors.
Proceedings of the 2012 24th Chinese Control and Decision Conference, CCDC 2012 | Year: 2012

A pressurizer (PRZ) mechanism model was employed for pressurized water reactor (PWR) nuclear power plant to meet rapid development of its simulation requirements. According to PRZ operational characteristics, the laws of energy conservation, mass and momentum conservation are used in obtaining a dynamic two-phase imbalance mechanism model which considering the influence of the spray flow, the power of electric heater as well as factors related to the safety valves. Particle Swarm Optimization (PSO) Algorithm was proposed to obtain a set of optimized parameters in the PRZ mechanism model. The parameter optimization algorithm was applied to a simulation case in PRZ of a 900MW PWR nuclear power plant, and a pressure simulation model was created by means of module packaging. By comparing the simulation results with the datum obtained by the PWR nuclear power plant, the correctness of modeling and the effectiveness of optimization methods were verified. © 2012 IEEE. Source


Cui N.,Beihang University | Xu G.,Beihang University | Ma S.,Baoding Sinosimu Technology Co.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2014

With an modular modeling method, a real-time dynamic simulation model for the thermodynamics system of a solar thermal power plant using direct steam generation in parabolic trough collectors filed (DSG-PTCs-STTP) without heat storage was developed. With certain simplification and assumption, the mathematics model about the solar collector fields, pre-heat, evaporator, super-heat system and buffer steam accumulator in a DSG solar collection and heating system were studied on the basis of the conservation principle and the basic equations of engineering thermodynamics, heat transfer theory and hydrodynamics. The complete real-time dynamic simulation model for the thermodynamic system of DSG-PTCs-STTP was built on the basis of above mathematics models and combined other relevant model (such as fluid network, turbine, condenser, deaerator, pump, alternator and excitation system). The simulation tests show that the developed simulation model can correctly simulate the dynamic characteristic and overall operating process of the DSG-PTCs-STTP, the iterative method applied in the models is stable. The dynamic simulation model can be used to develop the DSG-PTCs-STTP simulator, and is a good nonlinear object model for testing and validating the control system, and studying the operating performance of the DSG-PTCs-STTP. © 2014 Chinese Society for Electrical Engineering. Source


Ma S.,North China Electrical Power University | Cui N.,North China Electrical Power University | Liu Y.,Baoding Sinosimu Technology Co. | Wu M.,Baoding Sinosimu Technology Co.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2016

The direct steam generation in parabolic trough collectors systems (DSG-PTC) with different capacities and working-medium flow path were designed. The integration schemes for the integrated solar combined cycle system (ISCCS) taking DSG-PTC as the auxiliary heat source were put forward. The real-time dynamic simulation models for the ISCCS were studied based on the previous research achievements. With these dynamic simulation models, the operating characteristics of ISCCS were analyzed, the matching principle of the working-medium flow and energy flow between two energy systems were indicated, the control strategy improving suggestions in ISCCS are put forward, the dynamic response characteristics of the ISCCS are researched, the thermal economy of the ISCCS in different integration schemes are calculated, and the optimal integration scheme is proposed. © 2016 Chin. Soc. for Elec. Eng. Source


Cui N.,Beihang University | Cui N.,Baoding Sinosimu Technology Co. | Xu G.,Beihang University | Ma S.,Baoding Sinosimu Technology Co.
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2014

With the theoretical modeling and numerical calculation, the real-time dynamic simulation model about the Direct Steam Generation Parabolic Trough Collectors system (DSG-PTCs) with re-cycle water pump was studied. Based on the mass, energy and momentum conservation equations and knowledge of relevant specialties, the mathematics models for the parabolic trough solar collector, pre-heater, evaporator, super-heater system and buffer storage in DSG-PTCs were studied. Integrating these models with other auxiliary equipment simulation modules, a complete physics-based real-time dynamic simulation model for DSG-PTCs with re-cycle water pump was developed, with the Spanish PSA DISS project and INDITEP power unit as the simulated objects respectively. The tests show that the model can correctly simulate the dynamic characteristic and overall operating process of the simulated objects, and the iterative method applied in the models is stable. The model is used to study the transient performance about the solar thermal power plant using DSG-PTCs and the integrated solar aided fuel-fired power generation system, and develop the real-time simulation training system for operators. ©, 2014, Chinese Association for System Simulation. All right reserved. Source


Zhang Z.,North China Electrical Power University | Zhang Z.,Baoding Sinosimu Technology Co. | Ma Y.,North China Electrical Power University | Wang X.,North China Electrical Power University | And 3 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2015

According to the topology of conventional chopper cascade speed system, this paper analyzes the transient process of main loop of contactor protection when device failure. Because the contactor action requires a longer time, equipment is vulnerable to the impact of high voltage, high current during the contactor action, and cause damage to power electronic devices. For contactors and fast-cut protection drawbacks, the main circuit topology with electronic protection circuit is designed. Then transient process of conventional chopper cascade speed system and chopper cascade speed system with electronic protection circuit under high voltage power failure conditions are analyzed, and theoretics is detailedly deduced. The basis of theoretical analysis under high-voltage power failure condition is got. Finally, the conventional chopper cascade speed control system and with electronic protection circuits for high-voltage power failure conditions are tested on the simulated load test platforms. Experimental results show that the theoretical calculation is consistent with the actual measured values, and verify that electronic protection circuits effectively solve the problem of high-voltage power failure and inverter subversion under active inverter structure. ©, 2015, Power System Protection and Control Press. All right reserved. Source

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