基于换流器并网阻抗模型的故障穿越性能分析方法

• Format: Patent
• Language: Chinese
• Published: 18.04.2023
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

本发明提供的基于换流器并网阻抗模型的故障穿越性能分析方法，以内环为DQ电流控制和外环为直流电压控制，且采用消除故障电压扰动的锁相环的三相电压源换流器为例，同时考虑多重耦合影响和控制结构的多样性，通过换流器并网阻抗模型的建模，构建电路模型以便于分析电网故障条件下换流器的交-直流电路互连特性，并以单电流控制单元结构和双电流控制单元结构为例，说明采用不同控制策略时的并网序阻抗计算方法，以及基于该序阻抗计算基本扰动分量特性，进而评估换流器故障穿越性能。 The invention provides a fault ride-through performance analysis method based on a converter grid-connected impedance model. An inner loop is used for DQ current control, an outer loop is used for DC voltage control, a three-phase voltage source converter of a phase-locked loop for eliminating fault voltage disturbance is used as an example, and multiple coupling influences and the diversity of a control structure are considered at the same time; through modeling of the converter grid-connected impedance model, a circuit model is constructed so as to analyze AC-DC circuit interconnection characteristics of a converter under a power grid fault condition, and by taking a single-current control unit structure and a double-current control unit structure as examples, a grid-connected sequence