Abstract

This paper considers the main stages of operation of a three-phase voltage-source inverter and its constituent parts in the soft switching mode. It has been shown that the power transmitted to the load depends not only on the duration of the open state of the main switches of the inverter, but also on the duration of the operation of its auxiliary transistors, as well as on the amount of stored energy in the resonant circuit. The conditions for the fulfillment of the balance between the power consumed from the source and the power transmitted to the load have been determined. The paper shows that, according to the results of calculating the components of the power balance at individual intervals of operation, it is possible to determine the equivalent duty ratio for the power switches of the inverter in analytical form. Taking into account the equivalent duty ratio in the synchronous coordinate system, a continuous mathematical model of a three-phase voltage inverter with soft switching has been constructed and presented in the form of an equivalent electrical circuit. The calculation of the equivalent electrical circuit shows that the balance of power consumed from the power source and the power supplied to the load is true not only for the voltage inverter as a whole, but also for its main nodes. The equations of the mathematical model make it possible to develop inverter control systems with a current control loop, as well as multiloop systems of subordinate control. The solutions of the equations of the mathematical model under direct current and in the frequency range determine the dynamics and stability of the control process.

中文翻译：

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三相软开关电压源逆变器的功率平衡条件和等效占空比计算

摘要

本文考虑了软开关模式下三相电压源逆变器及其组成部分的主要运行阶段。已经表明，传输到负载的功率不仅取决于逆变器主开关打开状态的持续时间，还取决于其辅助晶体管工作的持续时间，以及存储的电量谐振电路中的能量。已经确定了实现从源消耗的功率和传输到负载的功率之间的平衡的条件。该论文表明，根据计算各个运行间隔的功率平衡分量的结果，可以以解析形式确定逆变器功率开关的等效占空比。考虑同步坐标系中的等效占空比，构建了软开关三相电压逆变器的连续数学模型，并以等效电路的形式呈现。等效电路的计算表明，从电源消耗的功率和提供给负载的功率的平衡不仅对电压逆变器整体而言是真实的，而且对其主要节点也是如此。数学模型的方程使得开发具有电流控制回路的逆变器控制系统以及从属控制的多回路系统成为可能。在直流和频率范围内，数学模型方程的解决定了控制过程的动态性和稳定性。