風力驅動 單相 誘導發電機의 數値解析

左宗根 濟州大學校工科大學産業技術硏究所 1997 尖端技術硏究所論文集 Vol.8 No.1

Newton Raphson algorithm using difference method for a wind driven self-excited single-phase induction generator is proposed, when the capacitor is connected to the auxiliary winding and the load to the main winding. This method requires only simple numeric calculations. comparing with other reported methods which contain monotonous and complicated algebraic manipulation. As the computed results, we find that the three difference methods can be applied to Newton Raphson algorithm. Also, the initial guess values and the step size are affected in the number of iterations. Furthermore, the central difference method is better than the forward and the backward difference method in the number of iterations.

磁機飽和를 考慮한 三相誘導電動機의 特性解析

左宗根 제주대학교 1979 논문집 Vol.11 No.-

The usual procedure in considering the operation of induction motors has been to neglect the effect of magnetic saturation and harmonics. In this paper, the T-type equivalent circuit of three phase induction motor under the unbalanced nonsinusoidal voltage is studied. By this equivalent circuit, which is considered magnetic saturation, we are able to calculate the accurate characteristics of inductioon motors when the unbalanced nonsinusoidal voltages are supplied. From the equivalent circuit, the calculated values and the measured values the compared and it is found that the theory agree with the experiment within the accuracy of 7%.

풍력구동 자기여자 유도발전기의 해석 : Newton Raphson법과 정할법의 비교

좌종근 濟州大學校 産業技術硏究所 1996 산업기술연구소논문집 Vol.7 No.1

The Newton Raphson method and the secant method for the steady state analysis of a wind driven self-excited induction generator are presented and compared in this paper. The nodal admittance method which involves simple algebraic calculations is used for this analysis. Very good agreement between the two numerical methods has been obtained on several load conditions, but it is found that the secant method is better than the Newton Raphson method in the number of iteration and the length of program.

整流回路를 考慮한 變壓器 等價回路

左宗根 제주대학교 1981 논문집 Vol.13 No.-

整流回路를 考慮한 單相變壓器 等價回路를 1) 電流의 重複角과 2) 重複角에 의한 電流成分의 影響도 考慮하여 3) 交流側에서 特性을 算定할 수 있도록 構成하였다. 이 等價回路에서 特性을 算定하여 實驗値와 比較한 結果 잘 一致하고 있으므로 整流回路를 가진 變壓器의 特性解析에 有用한 資料가 될 것이다. A steady-state wquivalent circuit of transformer using bridge rectifier in the secondary circuit was investigated. In order to determine this equivalent circuit, the current overlap angle u and the effects of current componets based on u were considered. From this equivalent circuit, the operation characteristics of this system were described and calculated. Some experimental results were compared with calculated value in graphical form.

變壓器의 等價回路 定數決定法

左宗根 제주대학교 1980 논문집 Vol.12 No.-

The T-type equivalent circuit constants of transformers with regard to magnetic saturation, are studied. And these constants are determined by measuring both prinary and secondary resistance, and also by the no-load test (at 60% and 100% of rated voltage) and the rated frequency short-circuit test (at 50%, 100% and 200% of rated current). By using these constants, the characteristics are calculated accurately, and the calculated values and measured values are compared.

風力 驅動 自己勵磁 誘導發電機의 解析 : 節点法과 루우프法의 比較 Comparison of Nodal and Loop Method

左宗根 濟州大學校工科大學産業技術硏究所 1995 尖端技術硏究所論文集 Vol.6 No.-

Two methods for the steady state analysis of wind driven self-excited induction generators are investigated in this paper. In this analysis, the T-type equivalent circuit neglected the core loss is used to predict the steady state performance under the resistance load. Computed results for the loop impedance and the nodal admittance method show very good agreement between the two. To maintain a constant terminal voltage and frequency, a simple method for determining the parameters speed, terminal capacitance, and exciting reactance is also introduced.

變壓器 過渡勵磁電流計算에 미치는 等價回路定數의 影響

左宗根 제주대학교 1985 논문집 Vol.21 No.-

實測資料만에 의하여 變壓器 過度勵磁電流計算을 위한 T型等價回路를 構成하고 回路定數 변화에 대한 影響을 檢討하여 回路定數의 決定方法은 물론 電流計算方法도 提是하였다. 檢討한 決果 1. 回路定數를 決定기 위한 試驗은 1次捲線低抗測定, 無負荷試驗, 短試驗 및 Hysteresis 特性測定이 필요하며 2. r₁의 값은 1次低抗測定 決果値를 25。C로 換算하고 3. r??을 考廬하여 計算하여야 함을 알았다. T-type equivalent circuit, composed by test data, is used to calculate the transient magnetizing currents. Using this circuit, and method of determining circuit parameters considered the effect of the parameters variation as well as the method of computing inrush currents. The results obtained are as follows; 1) To determine the circuit parameters, primary winding-resistance measurement, open circuit test, short circuit test and hysteresis characteristic measurements are required. 2) The value of r₁, measured by primary winding-resistance measurement, should be converted into the resistance at 25。C. 3) The core loss resistance(r??) is necessary to compute the magnetizing inductance.

풍력 구동 자기여자 유도발전기의 해석 : 절점법과 루우프의 비교

좌종근 濟州大學校 産業技術硏究所 1995 산업기술연구소논문집 Vol.6 No.-

Two methods for the steady state analysis of wind driven self-excited induction generators are investigated in this paper. In this analysis, the T-type equivalent circuit neglected the core loss is used to predict the steady state performance under the resistance load. Computed results for the loop impedance and the nodal admittance method show very good agreement between the two. To maintain a constant terminal voltage and frequency, a simple method for determining the parameters speed, terminal capacitance, and exciting reactance is also introduced.

風力驅動 自己勵磁 誘導發電機의 解析 : Newton Raphson法과 正割法의 比較 Comparison of Newton Raphson and secant method

左宗根 濟州大學校工科大學産業技術硏究所 1996 尖端技術硏究所論文集 Vol.7 No.1

The Newton Paphson method and the secant method for the steady state analysis of a wind driven self-excited induction generator are presented and compared in this paper. The nodal admittance method which involves simple algebraic calculations is used for this analysis. Very good agreement between the two numerical methods has been obtained on several load conditions, but it is found that the secant method is better than the Newton Raphson method in the number of iteration and the length of program.

變壓器와 結合된 單相브리지 整流回路의 脈動電流計算法

左宗根 제주대학교 1983 논문집 Vol.16 No.-

變壓器와 結合된 單相브리지 整流回路의 等價回路에 의한 直流脈動電流計算에 대한 硏究結果 主要內容은 다음과 같다. 1) 對象負荷와 要求精度에 따라 本 方法을 利用하여 脈動電流를 簡便하게 計算할 수 있다. 2) 逆起電力負荷에서는 誤差가 X?에 거의 無關하고 E??/E?가 클수록 크다. 3) 抵抗負荷에서는 誤差가 R?가 클수록 작아지고 X?가 클수록 커진다. 4) 抵抗-逆起電力負荷에서는 誤差가 E??/E?의 값에 따라 -에서 +로 變하고 誤差가 ±10%以內인 E??/E?의 範圍는 X?가 클수록 좁아진다. Using equivalent circuit, a calculating method of ripple current of single rectifier combined with transformer was studied. The validity of the equivalent circuit method developed in this study was examined by comparing its results with those obtained from Irie's method. In order to develop the model, some circuit conditions were considered, and the results obtained are as follows. 1) Employing this method, ripple current could be easily calculated according to the object and required accuracy. 2) In emf load, the error is almost not affected by X? while greater E??/E? makes greater error. 3) In resistance load, error decreases with the increasing R? while increases with increment of X? of ±10% is becoming narrower with the increase ofX?value.