1. (1) Japanese Electric Association: “Grid-interconnection Code”, JEAC 9701-2016, p. 42, pp. 51-54, pp. 63-64, pp. 74-81, pp. 94-95, p. 274, p. 404, Ohmsha (2016) (in Japanese)
2. (2) Japan Electrical Safety & Environment Technology Laboratories: “Individual Test Method of Grid-connected Protective Equipment etc. for Multi-unit Grid-connected PV Power Generating Systems”, JETGR0003-4-8.0 (2017-12) (in Japanese)
3. (3) K. Shirasaki, N. Okada, K. Sano, and H. Iwatsuki: “Criterion for Continuous Oscillation of Reactive Power caused by the Frequency Feedback Method with Step Injection of Reactive Power”, IEEJ Trans. PE, Vol. 138, No. 8, pp. 659-670 (2018-8) (in Japanese)
4. (4) Y. Yoshida, H. Suzuki, K. Fujiwara, and Y. Ishihara: “Experimental Study of Islanding-Prevention Method by Harmonic Injection Synchronized to Exciting Current Harmonics of Pole Transformer”, IEEJ Trans. PE, Vol. 133, No. 1, pp. 79-90 (2013-1) (in Japanese)
5. (5) Y. Yoshida, H. Suzuki, K. Fujiwara, and Y. Ishihara: “Development of Islanding Detection Device for PV Inverters by Harmonic Impedance Detection and Performance Verification using Resonant Circuit”, IEEJ Trans. IA, Vol. 133, No. 10, pp. 961-969 (2013-10) (in Japanese)