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220kV电网解环方式对稳控系统的影响及分析 被引量:1
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作者 张中庆 颜俊 +2 位作者 马怡晴 张立平 马进霞 《水电能源科学》 北大核心 2014年第4期190-193,共4页
为设计出适用于合解环运行方式灵活、网架结构薄弱的220kV区域电网的安全稳定控制系统,以贵州省奢香区域电网为例,采用BPA程序建立了交直流系统机电暂态仿真模型,针对2013年丰大、枯大合环、解环多种运行方式进行潮流稳定计算分析。结... 为设计出适用于合解环运行方式灵活、网架结构薄弱的220kV区域电网的安全稳定控制系统,以贵州省奢香区域电网为例,采用BPA程序建立了交直流系统机电暂态仿真模型,针对2013年丰大、枯大合环、解环多种运行方式进行潮流稳定计算分析。结果表明,合解环运行方式下系统潮流分布、稳定问题和稳控措施差别较大,且不同解环方式的判别方法和切机切负荷对象也不同。为准确判断系统运行方式、实施正确的稳控措施,稳控系统宜采用集中式配置方案。 展开更多
关键词 解环方式 稳控系统 稳控措施 奢香区域
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ID-Based Threshold Decryption Secure Against Chosen Plaintext Attack
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作者 龙宇 陈克非 刘胜利 《Journal of Shanghai Jiaotong university(Science)》 EI 2006年第2期127-133,共7页
B.Libert and J.Quisquater proposed an identity(ID)-based threshold decryption scheme. This paper found flaw in their security reduction and presented two methods to prove this scheme is resist against chosen-plaintext... B.Libert and J.Quisquater proposed an identity(ID)-based threshold decryption scheme. This paper found flaw in their security reduction and presented two methods to prove this scheme is resist against chosen-plaintext attack(CPA), based on the weaker model of security known as selective ID-based threshold CPA and the common model known as ID-based threshold CPA respectively. 展开更多
关键词 threshold decryption identity-based cryptology publicly checkable encryption
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Study and verification on dispersion coefficient in wave field
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作者 SHEN LiangDuo ZOU ZhiLi 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第5期1443-1454,共12页
Transport and diffusion caused by coastal waves have different characteristics from those induced by flows. Through solving the vertical diffusion equation by an analytic method, this paper infers a theoretical formul... Transport and diffusion caused by coastal waves have different characteristics from those induced by flows. Through solving the vertical diffusion equation by an analytic method, this paper infers a theoretical formula of dispersion coefficient under the combined action of current and waves. It divides the general dispersion coefficient into six parts, including coefficients due to tidal current, Stokes drift, wave oscillation and interaction among them. It draws a conclusion that the contribution of dispersive effect induced by coastal waves is mainly produced by Stokes drift, while the contributions to time-averaged dispersion coefficient due to wave orbital motion and interaction between current and waves are very small. The results without tidal current are in agreement with the numerical and experimental results, which proves the correctness of the theoretical derivation. This paper introduces the variation characteristics of both the time-averaged and oscillating dispersion coefficients versus relative water depth, and demonstrates the physical implications of the oscillating mixing coefficient due to waves. We also apply the results to the costal vertical circulation and give its characteristics compared to Stokes drift. 展开更多
关键词 dispersion coefficient longitudinal dispersion unsteady flow WAVE
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