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TCSC의 $H_{\infty}$ 제어에 의한 대규모 전력계통의 지역간 저주파진동 억제 Part II: $H_{\infty}$제어기 설계
김용구,전영환,송성근,심관식,남해곤,Kim, Yong-Gu,Jeon, Yeong-Hwan,Song, Seong-Geun,Sim, Gwan-Sik,Nam, Hae-Gon 대한전기학회 2000 전기학회논문지A Vol.49 No.5
This paper presents a systematic design procedure of $H_{\infty}$ controller of TCSC for damping low frequency inter-area oscillations in large power systems. Sensitivities of the inter-area mode for changes in line susceptance are computed using the eigen-sensitivity theory of augmented system matrix and TCSC locations are selected using the line sensitivities. The reduced model required for designing a manageable-size $H_{\infty}$ controller is obtained using the reduced frequency domain system identification method and the various weighting functions are tuned systematically to provide a robust performance. The proposed $H_{\infty}$ controller proved to be very effective for damping the inter-area mode of the large KEPCO power system.
TCSC의 $H_{\infty}$ 제어에 의한 대규모 전력계통의 지역간 저주파진동 억제 PartI : 설치지점 선정
김용구,심관식,송성근,김영환,남해곤,Kim, Yong-Gu,Sim, Gwan-Sik,Song, Seong-Geun,Kim, Yeong-Hwan,Nam, Hae-Gon 대한전기학회 2000 전기학회논문지A Vol.49 No.5
This paper presents application results of the augmented matrix eigen-sensitivity theories to TCSC siting problem for damping the inter-area low frequency oscillation in the large KEPCO system. First and second-order eigen-sensitivities of the inter-area low frequency oscillation in the large KEPCO system. First and second-order eigen-sensitivities of the inter-area mode are computed fro changes in susceptance of the transmission lines. The lines having high sensitivity are chosen as the initial candidates for installing TCSC. Then for each of the chosen candidates, Bodeplot of the transfer function with line susceptance as the input and the bus voltage at one side of the line as the output is computed. Using the Bode plots, the lines having any zeros near the inter-area mode are screened out since design of TCSC controller is very difficult in such a case. The $H_{\infty}$ TCSC controller installed at any finally chosen candidate is found to be effective in damping the inter-area oscillation, and the proposed TCSC siting algorithm is proved to be valid. Design of $H_{\infty}$ controller is described in Part IIof this paper.
한철(Chul Han),박병우(Byoung-Woo Park),양승학(Seung-Hak Yang),남해곤(Hae-Gon Nam),박성준(Sung-Jun Park) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
계통연계형 인버터는 스위칭 주파수로 인한 출력단에 고조파를 함유하고 있기 때문에, 고조파 감소를 위한 수동필터가 필수적으로 필요하다. 이러한 수동 필터는 다양한 용량 및 부하, 넓은 범위의 입ㆍ출력 조건등 여러 가지 파라미터를 필요로 하기 때문에 LCL필터는 설계가 어렵다는 단점이 있다. 이에 본 논문에서는 임피던스 크기, 스위칭 고조파 제한, 기본파 성분에 대한 고조파 제한의 3가지 구속조건에 따른 LCL필터를 설계방법을 제안하며, 이를 실제 시뮬레이션을 통해 계통 연계형 LCL필터로서의 타당성을 검증할 것이다.
허민호(Min-Ho Heo),송성근(Sung-Gun Song),김광헌(Gwang-Heon Kim),남해곤(Hae-Gon Nam),박성준(Sung-Jun Park) 대한전기학회 2009 전기학회논문지 Vol.58 No.12
The enhanced phase angle estimation algorithm is essential to supply the power stably under synchronizing with grid source. In this paper, we are proposed the novel phase angle estimation algorithm and verified the validity of proposed method as simulation with PSIM and experiments. We sort the harmonics element using high-pass filter(HPF) that have the cut-off frequency below basic element and make reverse d-q transformation. So, it can be restored the harmonics element at stationary axis, and we can get the fundamental voltage element of AC grid. Proposed PLL method have a rapid responsibility and a large margin at controller design than conventional method because it have a small phase delay and a sufficient controller gain margin. And, it can reduce the error of voltage rms value and axis transformation according to robust PLL algorithm against the harmonic and phase unbalance.