Search

Your search keyword '"Zeng, Z.C."' showing total 21 results
Start Over Author "Zeng, Z.C."
21 results on '"Zeng, Z.C."'

7. Neoadjuvant chemoradiotherapy versus neoadjuvant chemotherapy followed by minimally invasive esophagectomy for locally advanced esophageal squamous cell carcinoma: a prospective multicenter randomized clinical trial

Author

Tang, H., primary, Wang, H., additional, Fang, Y., additional, Zhu, J.Y., additional, Yin, J., additional, Shen, Y.X., additional, Zeng, Z.C., additional, Jiang, D.X., additional, Hou, Y.Y., additional, Du, M., additional, Lian, C.H., additional, Zhao, Q., additional, Jiang, H.J., additional, Gong, L., additional, Li, Z.G., additional, Liu, J., additional, Xie, D.Y., additional, Li, W.F., additional, Chen, C., additional, Zheng, B., additional, Chen, K.N., additional, Dai, L., additional, Liao, Y.D., additional, Li, K., additional, Li, H.C., additional, Zhao, N.Q., additional, and Tan, L.J., additional

Published
2023
Full Text
View/download PDF

12. A simplified approach to estimate maximum loading conditions in the load flow problem

Author

Zeng, Z.C., Galiana, F.D., Ooi, B.T., and Yorino, N.

Subjects
Electric power-plants -- Load, Electric power systems -- Load dispatching, Voltage -- Research, Business, Electronics, Electronics and electrical industries
Abstract

This paper describes a computationally efficient and simple approach to estimate maximum loading conditions in the load flow problem. These operating points are known to result in a number of undesirable phenomena such as the singularity of the Jacobian, solution bifurcations, and voltage collapse. The approach presented here generates precise estimates of the maximum possible amount of load increase that the system can tolerate along a specified path, as well as the corresponding voltage vector. The method described here is simple and efficient since it is based primarily on conventional load flow solutions. Tests on several standard power networks confirm the accuracy and efficiency of the technique.

Published
1993

13. Analysis of the load flow behaviour near a Jacobian singularity

Author

Galiana, F.D. and Zeng, Z.C.

Subjects
Singularities (Mathematics) -- Analysis, Determinants -- Analysis, Electric power systems -- Analysis, Business, Electronics, Electronics and electrical industries
Abstract

This paper presents new theoretical results about the behaviour of the load flow solution near a Jacobian singularity. The principal result is the derivation of an analytic closed form relation between the specified injections and the resulting voltages in the neighbourhood of a singularity. This result is a companion to the conventional load flow sensitivity analysis which is valid only if the operating point is not at a Jacobian singularity. The new closed form relation derived here is theoretically important since it can predict and explain the main load flow phenomena observed through simulation analysis near a singularity. These are: (i) the non-existence of solutions for certain injection changes, (ii) the bifurcation of the voltages into two nearby solutions, (iii) the sudden collapse of voltages for small injection changes, (iv) the nature of the collapse, that is, which buses are more susceptible to the collapse. Numerical simulations support the validity of the theoretical result by comparing the closed form analytic relation near a singularity with exact load flow simulations.

Published
1992

Catalog

Books, media, physical & digital resources
See catalog results