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| Research on Parameters of DC Switch Oscillation Circuit Based on Arc Model |
| Yu Lei1, Li Jinbin2, Yuan Jiaxin3, Wang Yifan3, Jiang Ziwei3, Li Jiawei1 |
1. State Grid Hubei Direct Current Company Yichang 443000 China;
2. State Grid Hubei Electric Power Research Institute Wuhan 430077 China;
3. School of Electrical Engineering and Automation Wuhan University Wuhan 430072 China |
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Abstract The DC transfer switch is an essential piece of equipment in ultra-high voltage DC transmission projects. It is mainly used to increase the flexibility of transmission operations and to protect and remove faults. The DC transfer switch is composed of three parts: the breaking circuit, energy absorption circuit, and oscillation circuit. The oscillation circuit creates a “zero-crossing point” by providing oscillation current during the DC switch breaking process. The oscillation process plays a decisive role in the successful breaking or not. Therefore, it is urgent to study the influence of oscillation circuit parameters on the breaking. The parameters of capacitors in the oscillation circuit are affected by manufacturing, transportation, use, and other processes, which may result in initial type faults, occasional faults, overload operation faults, and aging operation faults. A fault can cause a change in the capacitance value, which may cause the DC switch to fail to open. The existing research has not yet considered the parasitic parameters of the oscillation circuit based on the arc characteristics of the breaking circuit, which has limitations such as parameter mismatch and low accuracy. Moreover, there is limited research on various arc models applicable to DC conversion switches.
This article first analyzes in detail the principles and characteristics of various arc models. Then, based on the parameters of a certain ultra-high voltage DC transmission system, an improved model with equivalent multi-capacitor combination and parasitic parameters is constructed to improve the accuracy of the oscillating circuit model. Next, simulation research on the improved oscillating circuit model is carried out based on the Simulink simulation platform, and the characteristics of the oscillating circuit itself are also experimentally studied on site. The theoretical calculation results, simulation results and experimental results are compared and analyzed to verify the correctness of the model. Subsequently, the equivalent arc model of the breaking circuit is theoretically studied, and the working results of the DC switch under different arc models are compared by simulation. Finally, in order to simulate possible situations on site, the influence mechanism of oscillating circuit parameters on the breaking process is further studied in depth under normal and fault conditions. and the following conclusions were drawn:
(1) The error between theoretical calculation values, transient simulation results, and oscillation characteristics experimental results is relatively small, which verifies the effectiveness of the improved model of equivalent multi capacitor combination with parasitic parameters.
(2) The modeling of DC switches cannot ignore the arc model, and the application of the Mayr arc model can accurately and efficiently simulate the changes in arc characteristics during the breaking process of DC switches.
(3) The parameters of the oscillation circuit have a significant impact on the breaking process, and excessive oscillation circuit resistance will prolong the arcing time, which is not conducive to breaking; Although some small capacitor faults can shorten the arcing time, they will accelerate the current change rate and increase the current amplitude several times. It is recommended to regularly inspect the oscillation circuit to ensure that the oscillation parameters are at a reasonable value.
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Received: 13 January 2023
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2023, Vol. 38 
