Advanced Power System Models for Transient stability analysis
Deregulation in the power market has encouraged the move towards distributed generation, where many smaller generating plants located close to major loads, as opposed to a few large centrally located power stations, are penetrating into interconnected power systems. Nowadays, generating electricity using decentralized generators of relatively small scale is attracting a great interest from electric energy researchers. Such kind of generation is known as Distributed Generation Systems (DGS). Main aim of using large amount of DGS in the future is to increase system reliability and lower the cost of power through the use of on-site generation. Since the DGS Penetration Level (PL) is still low (DG power generated less than 20％ of power consumption in a sub-grid), the technical problems related to DG are limited to voltage profile support and control of interfacing conversion devices. When PL increases, several other problems will need to be faced and solved. Stability and quality of electrical energy problems may arise, new planning tools will be needed, dispatching of energy sources with typical random production will be necessary, protection systems must be integrated and revised. Within new projects in the future in supplying local areas, a Power Operation and Power Qua1ity Management System (POPQMS) must be developed. In order to model the parts of network with regulation programmable opened software in Matlab – DynaSolv was developed. DynaSolv can simulate multi-machine dynamics. The paper describes various principles of penetration synchronous machine type DGS into distribution network. This study provides possible complex analysis view on DGS stability issues, which can answer the possibility of connection. Presented paper describes various principles of penetration synchronous machine type DGS into distribution network. The study was aimed to possible operation area of the connected sources with regard to stable operation in steady state conditions and stable operation after clearing the fault. It can be assumed, that in locally penetrated system (i.e. to one feeder) inter-machine couplings are smooth and voltages are similar and thus such a system’s behavior is stable and thus doesn’t strictly require centralized regulation. Globally penetrated system requires from very small amount of installed DGS new centralized control strategies to maintain stable operation. Finally, it must be noted, that stable operation at same PL of DGS strongly depends on chosen technology (i.e. machine type). From that point of view, preferred technologies must be determined. From all of the computations meant above may arise new restrictions during the purposed new source operation. During the last decade, the role of distributed generation has increased. Increasing trend is also followed up by the installations with non-controllable sources. This group of sources represent dominantly induction machines in wind turbines, however also part of synchronous machines. Negative aspects of non-controllable (meant centrally) synchronous machines in DGS have been proved. On the other hand, use of induction machines brings potential risks in virtue of reactive power need, which in addition worsens positive effect of DGS on system losses compared to synchronous machines.
Distributed Generation Systems Locally penetrated system Globally penetrated system Transient stability analysis Penetration level synchronous machine
J.TLUSTY Z.MULLER V.VALOUCH C.QIN
Czech Technical University in Prague Czech Republic Academy of Sciences of the Czech Republic Czech Republic Xinjiang University in Urumqi China
国际会议
桂林
英文
1-13
2009-10-28（万方平台首次上网日期，不代表论文的发表时间）