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| Oscillation Frequency Detection Methods Based on Jump Point Detection and Second-Order Generalized Integrator Frequency-Locked Loop for DC Power Distribution Systems |
| Fan Youlin1, Wang Yue1, Wang Tonglu1, Zhao Bi'an1, Su Xinyang2 |
1. State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an 710049 China;
2. Department of Electrical and Electronic Engineering The Hong Kong Polytechnic University Hong Kong 999077 China |
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Abstract TThe DC distribution power system is gradually being widely used due to its low power loss and easy control of power flow. However, its high degree of power electronicization can cause impedance mismatches between power electronic devices, leading to system oscillation. The virtual impedance strategy has become the mainstream solution due to its low cost and lack of need for external devices. However, in practical DC distribution power systems, such as data center power supply systems, changes in oscillation frequency caused by frequent alterations in system structure and external parameters limit their oscillation-suppressing effect. This paper proposes two oscillation frequency detection methods: one based on the jump point detection method and the other on the second-order generalized integrator frequency-locked loop (SOGI-FLL).
To solve the oscillation problem in DC distribution power systems, the actual multi-parallel system is first simplified into a typical cable-converter cascade system. While the source and load side impedance models are established separately, impedance criteria are used to determine system stability. Then, the stability principle and key parameters of the virtual impedance strategy are introduced, and the effectiveness of suppressing oscillations with virtual impedance is theoretically verified.
The oscillation frequency detection method based on the jump point detection method is proposed. The principle of the traditional peak valley detection method for detecting oscillation frequency is introduced. The problems existing in its application process are analyzed. Then, a jump point detection algorithm is introduced to expand the applicability. Meanwhile, the frequency extraction principle of the jump point detection algorithm is derived, and an adaptive oscillation suppression strategy is designed in combination with the traditional virtual impedance strategy. Based on the actual cable and transformer operating conditions, the algorithm parameters are reasonably intended.
Then, this paper proposes an oscillation frequency detection method based on SOGI-FLL. The frequency extraction principle of SOGI-FLL is introduced. Combined with the traditional virtual impedance strategy, it is incorporated into the design of an adaptive oscillation suppression strategy for the DC system. The principles of parameter selection are derived, and the impact of parameters on system performance is analyzed.
The results on the 48 V to 60 V/500 W platform indicate that both proposed oscillation frequency detection algorithms can extract single-frequency ripple frequencies with excellent accuracy. The suppression effect of two algorithms is tested when the cable changes. The results indicate that, combined with the virtual impedance strategy, the two proposed oscillation frequency detection strategies can suppress system oscillations. The oscillation frequency detection method based on SOGI-FLL offers higher frequency extraction accuracy and a wider frequency extraction range. In contrast, the method based on jump point detection provides faster frequency extraction speed and reduced computing power consumption. Meanwhile, both strategies have good wideband applicability.
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Received: 26 May 2025
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2026, Vol. 41 
