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PSIM User Manual phần 2

thiệt hại gián tiếp, ngẫu nhiên, hoặc do hậu quả của bất kỳ ký tự, bao gồm, mà không mất mát, hạn chế lợi nhuận kinh doanh, dữ liệu, thông tin kinh doanh , hoặc bất kỳ và tất cả các thiệt hại thương mại khác hoặc tổn thất, hoặc cho bất kỳ thiệt hại vượt quá giá niêm yết cho các giấy phép phần mềm và tài liệu. | Resistor-Inductor-Capacitor Branches The nonlinear B-H curve is represented by piecewise linear approximation. Since the flux density B is proportional to the flux linkage X and the magnetizing force H is proportional to the current i the B-H curve can be represented by the X-i curve instead as shown below. A33 A A1 L A B Inductance L X i 1 2 3 i H The inductance is defined as L X i which is the slope of the X-i curve at different points. The saturation characteristics can then be expressed by pairs of data points as i 1 L1 i2 L2 i3 L3 etc. 2.1.4 Nonlinear Elements Four elements with nonlinear voltage-current relationship are provided - Resistance-type NONV v . - Resistance-type with additional input x NONV_1 v i x - Conductance-type NONI i v - Conductance-type with additional input x NONI_1 i v i The additional input x must be a voltage signal. Image NONV NONI r 71 ĩ NONV_1 NONI_1 r 71 o Input x T Attributes For resistance-type elements Parameters Description Expression i or i x Expression v i for NONV and v i x for NONV_1 PSIM User Manual 2-3 Chapter 2 Power Circuit Components Expression df di The derivative of the voltage v versus the current i i.e. df i di InitialValue io The initial value of the current i Lower Limit of i The lower limit of the current i Upper Limit of i The upper limit of the current i For conductance-type elements Parameters Description Expression f v or f v x Expression df dv Initialvalue vo Lower Limit of v Upper Limit of v Expression i f v for NONI and i fvx for NONI_1 The derivative of the current i versus the voltage v i.e. df v dv The initial value of the voltage v The lower limit of the voltage v The upper limit of the voltage v The correct initial value and lower upper limits will help the convergence of the solution. Examples Nonlinear Diode The nonlinear element NONI in the circuit above models a nonlinear diode. The diode current can be expressed as a function of the voltage as i 10-14 e 40 v-1 . In PSIM the specifications of the