Mechanism research on active power fluctuation caused by servo valve jamming of turbo-generator
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ORIGINAL PAPER
Mechanism research on active power fluctuation caused by servo valve jamming of turbo-generator Jiasheng Wang1 · Yinquan Hu1 · Wei Zhang1 Received: 7 October 2019 / Accepted: 11 April 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract To solve forced power oscillations arising from a thermal power unit’s load fluctuation frequently, load control mechanisms and solutions were studied in combining with these actual accidents data. This paper comprehensively analyzes the load control principle and provides a basic accident handling procedure according to the unit’s actual condition. According to analysis, inspection and dynamic test results, load fluctuation causes locked-in-place jamming of servo valve. An actuator model is established to simulate the unit’s operation under different control parameters. The simulation results show that setting unreasonable control parameters intensifies load fluctuations into forced load oscillation, which is verified by dynamic testing of the unit and the effect of control optimization on operation. This analysis and the resolution of this issue are effective and accurate, providing a valuable reference in the event of a similar accident. It is determined that strict process control of overhaul and in operation can reduce the probability of load fluctuation, and control parameter optimization can avoid forced load oscillation. Keywords Thermal power unit · Servo valve · Forced power oscillation · Power grid
1 Introduction In China, the power system comprises large-capacity thermal power units and some renewable energy units within large regional power grids. Although the fraction of thermal power’s contribution to total production is decreasing, it still accounts for 70.41% [1], which services the base load in power grid and provides a platform for grid access for many renewable energy units [2, 3]. For larger capacity units in the mainline, the instability of its control system can result in load fluctuation, which leads to forced power oscillations in local power grids and power grid collapse [4, 5]. Therefore, it is particularly important to prevent load fluctuation and forced power oscillations in thermal power units and power grids. For low-frequency oscillations in power grids, there has been substantial research [6, 7] that provides some countermeasures, such as reducing power flow, increasing mainline voltage and deployment of Power System Stabilizers (PSS).
B 1
Jiasheng Wang [email protected] School of Electrical Engineering, Chongqing Vocational Institute of Engineering, Chongqing 402260, China
However, with the changing structure of the power grid, the increasing capacity of long-distance power transmission and the tie-in of renewable energy units, unstable factors in the power system are more complex and the support role of larger thermal power units become especially prominent [8, 9]. Due to the control complexity of larger thermal power units, there are few existing effective methods to detect control system faults or its se
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