Synchronous Starting of Synchronous Machine

Rajamani, K.; Hariharan, M. V.

doi:10.1080/07313569308909690

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…In this paper, constant excitation and turbine pump with closed gate valves are suggested to be adopted in back-to-back starting. Back-to-back starting and its control strategies had been discussed in [6,9,10]. Since the main scope of this paper is fault analysis during back-to-back starting, the control strategy optimisation is not addressed in detail.…”

Section: Back-to-back Starting Procedures and Its Verificationmentioning

confidence: 99%

“…Karmaker and Mi [8] discussed the method to improve the starting performance of large salient-pole synchronous machines by predicting damper bar currents, electromagnetic torque and acceleration time. Concordia et al [ 9] and Rajamani and Hariharan [10] studied the electrical and mechanical variables during back-to-back starting, and provided guidance for proper selection of the main parameters for a successful start. Shiwu et al [ 11] discussed the performance of transformer protection when de-excitation occurs during back-to-back starting process.…”

Section: Introductionmentioning

confidence: 99%

“…Concordia et al . [9] and Rajamani and Hariharan [10] studied the electrical and mechanical variables during back‐to‐back starting, and provided guidance for proper selection of the main parameters for a successful start. Shiwu et al .…”

Section: Introductionmentioning

confidence: 99%

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Short‐circuit analysis of pumped storage unit during back‐to‐back starting

Duan

2015

IET Renewable Power Generation

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Back-to-back starting is a widely accepted starting method for pumped storage units. A back-to-back starting model of pumped storage units was built using the ElectroMagnetic Transients Program including DC (EMTDC) software package. The short-circuit fault during back-to-back starting was investigated for the first time. The starting process was simulated and compared with real data from a pumped storage power plant in northeast China. The rotor speed and the effect of resistance during fault period were also discussed. The results showed that the fault current has significant magnitude and low-frequency characteristic. Recommendations were provided to realise secure and reliable fault clearance during back-to-back starting based on the fault characteristics and real de-excitation test results of the pumped storage power plant.

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Section: Back-to-back Starting Procedures and Its Verificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Short‐circuit analysis of pumped storage unit during back‐to‐back starting

Duan

2015

IET Renewable Power Generation

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“…The feasibility of this kind of startup is analyzed theoretically. Guidance was developed in order to correctly select the main parameters for a successful start [16]. By means of simulating the transient starting performance for a PSU, alternative designs and their effects on the startup ability of the PSU for reliable improvement of the starting system were studied [17].…”

Section: Introductionmentioning

confidence: 99%

Multi-Objective Optimization of Back-to-Back Starting for Pumped Storage Plants under Low Water Head Conditions Based on the Refined Model

Feng

Zheng

et al. 2022

Sustainability

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Pumped storage plants (PSP) must switch frequently between various working conditions. Moreover, PSPs can fall easily into an S-shaped zone under low water head conditions, especially during back-to-back starting (BTBS), which reduces the stability and safety of unit operation. In this paper, a nonlinear PSP model for BTBS is established by combining an electrical subsystem with a refined hydraulic-mechanical subsystem. The influences of the hydraulic, mechanical, and electrical factors on the BTBS process are investigated quantitatively. Choosing the speed overshoot and speed stable time as the optimization objectives, and considering a variety of constraints, the multi-objective particle swarm optimization (MOPSO) algorithm is introduced to study and optimize two typical startup strategies. The results show that: (1) The parameters of a hydraulic-mechanical-electrical system have a significant impact on BTBS process, and the most unfavorable working condition corresponds to the lowest water head; (2) In the control schemes, a novel constant excitation voltage strategy is proposed based on the multi-objective optimization scheme. Compared with the constant excitation current strategy or single-objective, the optimization strategy proposed can considerably improve the speed overshoot and the speed stable time by at least 68.27% and 3.22% under the worst working conditions. (3) It is further verified that the problem of trapping in the S-shaped region under various working conditions may be avoided by the obtained optimal control scheme. The results give prominence to the effectiveness of the proposed optimization strategy for maintaining the safety and stabilization of PSP operation.

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The Coordination of Back-to-Back Starting and Protections for Pumped Storage Units

Xiao¹,

Liu²,

Kang³

2012

2012 Asia-Pacific Power and Energy Engineering Conference

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Using the state equations of synchronous motor, this paper establishes a mathematical model of back-to-back starting. Simulations of back-to-back starting process for pumped storage units under different conditions are made, including the normal starting and starting processes with motor de-excitation and braking and so on. The variations of electrical quantities in the starting process are simulated. By analyzing the physical processes and the simulation results, two new issues are recognized that coordination of excitation systems between two units and the differential protections of transformer and units faced in back-to-back starting. Finally, appropriate solutions for these two problems are proposed. The two excitation systems can be removed simultaneously by adding a hard-wire circuit between LCU and the tripping circuit and each of these circuits is added with an additional relay. The corresponding differential protection should be locked according to different operating conditions in the process of back-to-back starting.

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Synchronous Starting of Synchronous Machine

Cited by 5 publications

References 3 publications

Short‐circuit analysis of pumped storage unit during back‐to‐back starting

Short‐circuit analysis of pumped storage unit during back‐to‐back starting

Multi-Objective Optimization of Back-to-Back Starting for Pumped Storage Plants under Low Water Head Conditions Based on the Refined Model

The Coordination of Back-to-Back Starting and Protections for Pumped Storage Units

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