基于载波频率的高频电流传感器均流控制系统设计

Design of current equalization control system for high frequency current sensor based on carrier frequency

摘要:

为使支路电流与总电流之间的数值配比关系始终低于额定极值标准，从而避免高频传感器元件出现电流占空输出的表现情况，设计基于载波频率的高频电流传感器均流控制系统。在IGBT驱动电路的支持下，按需连接电容变压器、均流电感元件、滤波电流传感器三类硬件应用设备，再根据DSP控制单元中支路电流的输出水平，确定电量变换器设备所处的实时连接位置，完成高频电流传感器均流控制系统的开发与实现。根据电流循环谱的特征条件，计算一阶载波指标、二阶载波指标的计算数值，联合已知的载波系数参量，确定当前情况下的电流频率协方差标准，实现基于载波频率的电流传输行为估计，匹配各级软、硬件执行条件，完成高频电流传感器均流控制系统的设计。实验结果表明，随着基于载波频率的均流控制系统的应用，支路电流与总电流之间的配比系数极大值始终不会超过额定极值条件，能够较好抑制高频传感器元件出现电流占空输出的情况，符合实际应用需求。

Abstract:

In order to keep the numerical ratio between the branch current and the total current always lower than the rated extreme value standard, so as to avoid the current duty output of the high-frequency sensor element, the current-sharing control of the high-frequency current sensor based on the carrier frequency is designed. system. With the support of the IGBT drive circuit, three types of hardware application equipment such as capacitive transformers, current sharing inductance components, and filter current sensors are connected as needed, and then the real-time power converter equipment is determined according to the output level of the branch current in the DSP control unit. Connect the location to complete the development and implementation of the high-frequency current sensor current sharing control system. According to the characteristic conditions of the current cycle spectrum, calculate the calculated values ??of the first-order carrier index and the second-order carrier index, and combine the known carrier coefficient parameters to determine the current frequency covariance standard under the current situation, and realize the current transmission behavior estimation based on the carrier frequency. , match the execution conditions of software and hardware at all levels, and complete the design of the high-frequency current sensor current sharing control system. The experimental results show that with the application of the current sharing control system based on the carrier frequency, the maximum value of the ratio coefficient between the branch current and the total current will never exceed the rated extreme value condition, which can better suppress the occurrence of high-frequency sensor elements. The current duty output is in line with the actual application requirements.