Abstract
In addition to providing an extremely clean environment for primary loop of high-temperature gas-cooled reactor (HTR), the primary helium circulator (PHC) using electromagnetic levitation technology also provides an effective means for vibration control. Besides synchronous vibration produced by mass imbalance and sensor runout, double-frequency vibration produced by unbalanced magnetic pull (UMP) is serious in PHC engineering prototype (PHC-EP). In this paper, we firstly analyzed the mechanism of UMP and the multi-frequency vibration characteristics in combination with the PHC-EP. Then we put forward a distributed iterative learning control (ILC) algorithm and a parallel control scheme to suppress the periodic vibrations. Finally, we verified the methods by carrying out experimental researches on the active magnetic bearing (AMB) bench of PHC-EP. The results show that the methods put forward in this paper have significant control effect on the double-frequency vibration generated by UMP of the PHC-EP and provide theoretical and practical references for the PHC safe operation in HTR.
Highlights
The construction of the world’s first high-temperature gas-cooled reactor (HTR) for commercial demonstration [1,2] will be completed and put into trial operation soon
According to the operation specification of the primary helium circulator (PHC)-EP, the speed is steadily increased to the rated speed with 4 000 r/m ( f ≈ 66.7 Hz) as described in Table 1, and we carry out the experimental researches
Since the implementation of the iterative learning control (ILC) algorithm does not need to pay attention to the original closed-loop feedback control system parameters and considering that the active magnetic bearing (AMB) has been working stably near the equilibrium point, the ILC parameters of the radial four directions are set in accordance with equations (35) and (37), and kBC = 1 is selected according to the AMB bench of PHC engineering prototype (PHC-EP)
Summary
The construction of the world’s first high-temperature gas-cooled reactor (HTR) for commercial demonstration [1,2] will be completed and put into trial operation soon. As the “primary pump”, primary helium circulator (PHC) is the key safety device in the HTR primary loop. Due to the special requirements of the helium circulation system, the traditional mechanical bearings cannot meet the application requirements as lubrication. Electromagnetic bearing is the best technical choice for the PHC rotor support because it has no mechanical contact and no lubrication [3]. The active magnetic bearing system (AMBs) used in PHC has been verified and will be put into commercial operation [4]. The PHC rotor is completed in accordance with strict standards in material selection, manufacturing and processing, etc., so the rotor mass imbalance is not serious
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