Xianggen Yin

Bio: Xianggen Yin is an academic researcher from Huazhong University of Science and Technology. The author has contributed to research in topics: Fault (power engineering) & Transformer. The author has an hindex of 12, co-authored 128 publications receiving 709 citations. Previous affiliations of Xianggen Yin include University of Science and Technology.

Study of Fault Current Characteristics of the DFIG Considering Dynamic Response of the RSC

Abstract: During nonsevere fault conditions, the crowbar protection is not activated and the rotor windings of a doubly fed induction generator (DFIG) are still excited by the ac/dc/ac converter In these cases, the dynamic response of a rotor-side converter (RSC) has a large influence on the fault current characteristics of the DFIG In this paper, an analysis method for the fault current characteristics of the DFIG under nonsevere fault conditions is proposed First, the dynamic response of the RSC is analyzed on condition that the external power control loop is shut down and the reference signals of the inner rotor current control loop are kept constant Then, the simplified calculation models of the rotor fault current are established according to different design principles of the inner rotor current controller Based on it, the fault characteristics of the stator current are studied and the analytical expressions of the stator fault current are obtained Finally, digital simulation results validate the analytical results The proposed analysis method is applicable for the study of fault current characteristics of DFIG with different control strategies for low-voltage ride through The research results are helpful to the construction of adequate relaying protection for the power grid with penetration of DFIGs

Power system economic dispatch under low-carbon economy with carbon capture plants considered

Abstract: Developing a low-carbon power system is critical and fundamental to cope with the challenges of global warming, in which the carbon capture and storage (CCS) technology will play a key role. In this study, the characteristics of energy flow and operation of carbon capture plants (CCPs) are clarified, while the mutual constraint between total generation output of CCPs and operation power consumption of carbon capture system is analysed. Then a generation output model and the optimal dispatch principle of CCPs is established, which can identify how the amount of carbon captured can represent a premium payment that can offset the increase in costs caused by the reduction on power output due to the CCS. On this basis, what with the low-carbon economy factors, a economic power dispatch model under low-carbon economy with CCPs considered is proposed. With the generation fuel cost and carbon emission cost incorporated in the objective function, the model proposed can effectively evaluate the power dispatch problem under low-carbon economy. Studies of the economic power dispatch of the 3-unit, 26-unit and 54-unit test systems show that the model proposed is effective and practical.

Adaptive ground fault protection schemes for turbogenerator based on third harmonic voltages

Abstract: Equivalent circuits based on the actual connection of coil-groups of generators are used to study the characteristics of various generator stator ground fault protection schemes presented in the literature. The evaluation and the comparison of the characteristics of those schemes are given by means of protection coverage-critical resistance curves. Although these schemes are successful in practice, they suffer the disadvantage of low sensitivity, which is strongly related to generator operating conditions. To overcome this disadvantage, two adaptive stator ground fault protection schemes based on digital techniques are developed. Compared to conventional third-harmonic voltage schemes, they can automatically track the change of generator operating conditions before a ground fault occurs. Test results from a digital simulation show that they can keep high sensitivity during all operating conditions. >

A Novel Integrated Protection for VSC-HVDC Transmission Line Based on Current Limiting Reactor Power

Abstract: In this paper, a novel integrated protection for VSC-HVDC transmission line is proposed. The protection scheme includes a main protection and a backup protection. The main protection is based on current limiting reactor power (CLRP), while the backup protection is based on variation tendency of current. The changing characteristics of CLRP and current are theoretically analyzed under different fault conditions. Based on the characteristics, internal and external faults of DC transmission line can be identified. Then criteria of the novel integrate protection can be built. The main protection can detect the faults quickly without communication, while the backup protection is used to identify the high resistance faults and provide a backup if main protection fails. The scheme not only protect the whole transmission line without dead zone, but also improve the speed of protection with simplified algorithm. A typical VSC-HVDC system is modeled using PSCAD/EMTDC. Comprehensive simulations is done to verify the performance of proposed scheme. Furthermore, the protection does not require a high sample frequency and does not require data synchronization. These make it valuable for application in practical VSC-HVDC transmission system.

Energy function analysis for power system stability

Abstract: (1990). ENERGY FUNCTION ANALYSIS FOR POWER SYSTEM STABILITY. Electric Machines & Power Systems: Vol. 18, No. 2, pp. 209-210.

“Stabilization wedges: Solving the climate problem for the next 50 years with current technologies” from science magazine (2004)

Abstract: Humanity already possesses the fundamental scientific, technical, and industrial know-how to solve the carbon and climate problem for the next half-century. A portfolio of technologies now exists to meet the world's energy needs over the next 50 years and limit atmospheric CO2 to a trajectory that avoids a doubling of the preindustrial concentration. Every element in this portfolio has passed beyond the laboratory bench and demonstration project; many are already implemented somewhere at full industrial scale. Although no element is a credible candidate for doing the entire job (or even half the job) by itself, the portfolio as a whole is large enough that not every element has to be used.

Load compensating DSTATCOM in weak AC systems

Abstract: The paper discusses load compensation using a distribution static compensator (DSTATCOM). It is assumed that the DSTATCOM is associated with a load that is remote from the supply. It is shown that the operation of a DSTATCOM assuming that it is connected to a stiff source in such situations will result in distortions in source current and voltage at the point of common coupling. To avoid this, the DSTATCOM is connected in parallel with a filter capacitor that allows the high frequency component of the current to pass. However, this generates control issues in tracking, as standard controls such as a hysteresis control are not suitable in these circumstances. This paper proposes a new switching control scheme and demonstrates its suitability for this problem. It also proposes a scheme in which the fundamental sequence components of a three-phase signal can be computed from its samples. The overall performance of the proposed scheme is verified using digital computer simulation studies.