CN205786850U - A power grid harmonic signal acquisition preprocessing circuit - Google Patents
A power grid harmonic signal acquisition preprocessing circuit Download PDFInfo
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Abstract
本实用新型涉及一种电网谐波信号采集预处理电路。包括电压信号预处理电路和电流信号预处理电路，电压信号预处理电路包括霍尔电压传感器和电压滤波电路，电网三相电压输出端与霍尔电压传感器输入端连接，霍尔电压传感器的输出端与电压滤波电路输入端连接，滤波电路输出端再接入具有A/D转换的采集装置的输入端。电流信号预处理电路包括霍尔电流传感器、电流滤波电路和放大电路，电网三相电流输出端连接霍尔电流传感器输入端，霍尔电流传感器输出端连接隔直电路输入端，隔直电路经过电流滤波电路和放大电路，连接至具有A/D转换的采集装置的输入端。本实用新型可以去除电网谐波信号中直流分量、噪声和高次谐波的干扰，保证采集数据的准确性。
The utility model relates to a power grid harmonic signal acquisition preprocessing circuit. It includes a voltage signal preprocessing circuit and a current signal preprocessing circuit. The voltage signal preprocessing circuit includes a Hall voltage sensor and a voltage filter circuit. The three-phase voltage output terminal of the power grid is connected to the input terminal of the Hall voltage sensor. It is connected to the input end of the voltage filter circuit, and the output end of the filter circuit is connected to the input end of the acquisition device with A/D conversion. The current signal preprocessing circuit includes a Hall current sensor, a current filter circuit and an amplification circuit. The three-phase current output end of the power grid is connected to the input end of the Hall current sensor, and the output end of the Hall current sensor is connected to the input end of the DC blocking circuit. The filtering circuit and the amplifying circuit are connected to the input terminal of the acquisition device with A/D conversion. The utility model can remove the DC component, noise and high-order harmonic interference in the harmonic signal of the power grid, so as to ensure the accuracy of data collection.
Description
技术领域 technical field
本实用新型属于电能质量监测技术领域，特别是涉及一种电网谐波信号采集预处理电路。 The utility model belongs to the technical field of electric energy quality monitoring, in particular to a grid harmonic signal acquisition preprocessing circuit.
背景技术 Background technique
近年来，由于非线性负荷的大量使用，导致电网谐波污染严重。电网谐波检测是解决谐波问题的基础，而保证谐波信号数据采集的准确性是谐波检测的根本。 In recent years, due to the extensive use of nonlinear loads, the harmonic pollution of the power grid has been serious. Power grid harmonic detection is the basis for solving harmonic problems, and ensuring the accuracy of harmonic signal data collection is the foundation of harmonic detection.
实用新型内容 Utility model content
本实用新型所要解决的技术问题在于提供一种电网谐波信号采集预处理电路，能够去除电网谐波信号中直流分量、噪声和高次谐波的干扰，保证采集数据的准确性，进而提高谐波检测的准确性。 The technical problem to be solved by the utility model is to provide a grid harmonic signal acquisition preprocessing circuit, which can remove the DC component, noise and high-order harmonic interference in the grid harmonic signal, ensure the accuracy of the collected data, and further improve the harmonic Accuracy of wave detection.
本实用新型是这样实现的，一种电网谐波信号采集预处理电路，包括电压信号预处理电路和电流信号预处理电路，所述电压信号预处理电路包括霍尔电压传感器和电压滤波电路，电网三相电压输出端与霍尔电压传感器输入端连接，霍尔电压传感器的输出端与电压滤波电路输入端连接，滤波电路输出端再接入具有A/D转换的采集装置的输入端。电流信号预处理电路包括霍尔电流传感器、电流滤波电路和放大电路，电网三相电流输出端连接霍尔电流传感器输入端，霍尔电流传感器输出端连接隔直电路输入端，隔直电路经过电流滤波电路和放大电路，连接至具有A/D转换的采集装置的输入端。 The utility model is achieved in this way, a power grid harmonic signal acquisition preprocessing circuit, including a voltage signal preprocessing circuit and a current signal preprocessing circuit, the voltage signal preprocessing circuit includes a Hall voltage sensor and a voltage filter circuit, the power grid The three-phase voltage output terminal is connected to the input terminal of the Hall voltage sensor, the output terminal of the Hall voltage sensor is connected to the input terminal of the voltage filter circuit, and the output terminal of the filter circuit is connected to the input terminal of the acquisition device with A/D conversion. The current signal preprocessing circuit includes a Hall current sensor, a current filter circuit and an amplification circuit. The three-phase current output end of the power grid is connected to the input end of the Hall current sensor, and the output end of the Hall current sensor is connected to the input end of the DC blocking circuit. The filtering circuit and the amplifying circuit are connected to the input terminal of the acquisition device with A/D conversion.
进一步地，电压滤波电路采用无限增益多路反馈低通滤波器。 Further, the voltage filtering circuit adopts an infinite-gain multi-channel feedback low-pass filter.
进一步地，霍尔电流传感器采用钳形霍尔电流传感器。 Further, the Hall current sensor adopts a pincer Hall current sensor.
进一步地，所述的电流滤波电路采用双二次带通滤波器。 Further, the current filtering circuit adopts a biquadratic bandpass filter.
进一步地，放大电路采用两级运算放大器电路。 Further, the amplifying circuit adopts a two-stage operational amplifier circuit.
本实用新型与现有技术相比，有益效果在于：本实用新型可以去除电网谐波信号中直流分量、噪声和高次谐波的干扰，保证采集数据的准确性，进而提高谐波检测的准确性，能够更好的为解决谐波问题提供帮助。而且，通过本实用新型，可以有效降低谐波检测的成本。 Compared with the prior art, the utility model has the beneficial effects that: the utility model can remove the DC component, noise and high-order harmonic interference in the harmonic signal of the power grid, ensure the accuracy of data collection, and further improve the accuracy of harmonic detection It can better provide help for solving harmonic problems. Moreover, the utility model can effectively reduce the cost of harmonic detection.
附图说明 Description of drawings
图1为本实用新型提供的实施例的电网谐波信号采集预处理电路的框图； Fig. 1 is the block diagram of the grid harmonic signal acquisition preprocessing circuit of the embodiment provided by the utility model;
图2为本实用新型提供的电压滤波电路； Fig. 2 is the voltage filtering circuit that the utility model provides;
图3为本实用新型提供的电流放大电路。 Fig. 3 is the current amplifying circuit provided by the utility model.
具体实施方式 detailed description
为了使本实用新型的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本实用新型进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本实用新型，并不用于限定本实用新型。 In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.
如图1所示，一种电网谐波信号采集预处理电路，该电路包括电压信号预处理电路和电流信号预处理电路。电压信号预处理电路的输入端连接到监测点的电压输出端，经过霍尔电压传感器降压，再经过电压滤波电路滤除噪声信号和高次谐波。电流信号预处理电路通过电流霍尔传感器采集电流信号，再经过电流滤波电路滤除直流分量、噪声和高次谐波，最后通过放大电路放大信号。 As shown in Figure 1, a power grid harmonic signal acquisition preprocessing circuit, the circuit includes a voltage signal preprocessing circuit and a current signal preprocessing circuit. The input terminal of the voltage signal preprocessing circuit is connected to the voltage output terminal of the monitoring point, and the voltage is lowered by the Hall voltage sensor, and then the noise signal and high-order harmonics are filtered out by the voltage filter circuit. The current signal preprocessing circuit collects the current signal through the current Hall sensor, then filters out the DC component, noise and high-order harmonics through the current filter circuit, and finally amplifies the signal through the amplifier circuit.
根据国家标准，电网监测点二次侧处的电压输出为100V，电流输出最大为5A。根据实际情况，霍尔电压电流传感器选择北京森社公司的CHV-50P闭环霍尔电压传感器和美国泰克公司的A622钳形电流探头。 According to national standards, the voltage output at the secondary side of the grid monitoring point is 100V, and the maximum current output is 5A. According to the actual situation, the Hall voltage and current sensor chooses the CHV-50P closed-loop Hall voltage sensor of Beijing Senshe Company and the A622 clamp current probe of the American Tektronix Company.
电网谐波分析时，考虑50次谐波的影响，在设计滤波器时，滤波器的截止频率fc＝50×50＝2.5kHz。 When analyzing the harmonics of the power grid, the influence of the 50th harmonic is considered. When designing the filter, the cut-off frequency of the filter is f c =50×50=2.5kHz.
电压滤波电路采用二阶或偶次阶级联无限增益多路反馈低通滤波器。如图2所示，以A相电压为例，在一个放大器U1的同相输入端连接电容C1,通过电容C1连接分压电阻R1至输入端，电阻R1经过电阻R2连接至放大器的反相输 入端，电阻R1与电阻R2之间引线通过电阻R3连接至放大器的输出端，在放大器的反相输入端与输出端之间连接电容C2。 The voltage filter circuit adopts a second-order or even-order cascaded infinite-gain multi-channel feedback low-pass filter. As shown in Figure 2, taking the phase A voltage as an example, connect capacitor C1 to the non-inverting input terminal of an amplifier U1, connect the voltage dividing resistor R1 to the input terminal through capacitor C1, and connect resistor R1 to the inverting input terminal of the amplifier through resistor R2 , the lead wire between the resistor R1 and the resistor R2 is connected to the output terminal of the amplifier through the resistor R3, and the capacitor C2 is connected between the inverting input terminal and the output terminal of the amplifier.
采用二阶无限增益多路反馈低通滤波器，由截止频率fc、增益G和滤波器的类型可以选择一个电容C的标称值，再由求出参数K，利用这个K值对照滤波器设计表确定其余元件值。选择尽可能接近滤波器设计表中数值的电阻，在低阶时，通常用容差为5％的标称电阻，高阶时，需要选用容差更小的电阻。 A second-order infinite-gain multi-channel feedback low-pass filter is used, and a nominal value of a capacitor C can be selected according to the cut-off frequency f c , the gain G and the filter type, and then determined by Find the parameter K, and use this K value to determine the remaining component values against the filter design table. Choose resistors that are as close as possible to the values in the filter design table. For low orders, nominal resistors with a tolerance of 5% are usually used. For high orders, resistors with smaller tolerances are required.
电流信号中包含直流分量，为了提高谐波检测的准确性，需要滤除这个直流分量。电流信号通过一个10Hz～2.5KHz的带通滤波器滤除直流分量、噪声和高次谐波的影响。 The current signal contains a DC component. In order to improve the accuracy of harmonic detection, this DC component needs to be filtered out. The current signal passes through a 10Hz-2.5KHz band-pass filter to filter out the effects of DC components, noise and high-order harmonics.
电流滤波电路采用二阶或级联的偶次阶双二次带通滤波器。如图3所示，以A相为例，采用二阶压控电压源带通滤波器，根据中心频率fo、增益G以及带宽B设计电路，先选择一个电容C的标称值，再由求出参数K，利用这个K值对照滤波器设计表确定其余元件值。 The current filtering circuit adopts a second-order or cascaded even-order biquadratic bandpass filter. As shown in Figure 3, taking phase A as an example, a second-order voltage-controlled voltage source band-pass filter is used, and the circuit is designed according to the center frequency f o , gain G and bandwidth B. First, a nominal value of a capacitor C is selected, and then the Find the parameter K, and use this K value to determine the remaining component values against the filter design table.
泰克A622电流探头采集来的电流信号大约为0～500mA，而A/D采集电路的量程为10V，为了提高采集精度，需要对电流信号进行放大。如图3所示，放大电路采用两级运算放大电路，为放大器U2与放大器U3串联，在放大器U2与放大器U3之间串联电阻R4，输入端通过电阻R7连接至放大器U2的反相输入端，放大器U2的正相输入端连接电阻R9接地，放大器的反相输入端与输出端之间连接电阻R8，同样的，在放大器U3的正相输入端连接电阻R6接地，在放大器U3的反相输入端与输出端之间连接电阻R5，从而实现放大倍数为10，两级运算放大电路产生360°相移，对电流信号不会产生相移影响，能够保证信号采集相位的准确性。 The current signal collected by the Tektronix A622 current probe is about 0-500mA, and the range of the A/D acquisition circuit is 10V. In order to improve the acquisition accuracy, the current signal needs to be amplified. As shown in Figure 3, the amplifying circuit adopts a two-stage operational amplifier circuit, the amplifier U2 is connected in series with the amplifier U3, the resistor R4 is connected in series between the amplifier U2 and the amplifier U3, and the input terminal is connected to the inverting input terminal of the amplifier U2 through the resistor R7. The non-inverting input of the amplifier U2 is connected to the resistor R9 to ground, and the resistor R8 is connected between the inverting input and the output of the amplifier. Similarly, the non-inverting input of the amplifier U3 is connected to the resistor R6 to ground, and the inverting input of the amplifier U3 Resistor R5 is connected between the terminal and the output terminal to achieve a magnification factor of 10. The two-stage operational amplifier circuit produces a 360° phase shift, which will not affect the phase shift of the current signal and can ensure the accuracy of the signal acquisition phase.
以上所述仅为本实用新型的较佳实施例而已，并不用以限制本实用新型，凡在本实用新型的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本实用新型的保护范围之内。 The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983343A (en) * | 2020-07-22 | 2020-11-24 | 宁波燕清汽车技术有限公司 | Current type wheel speed sensor acquisition circuit |
| CN112653403A (en) * | 2020-12-24 | 2021-04-13 | 唯捷创芯(天津)电子技术股份有限公司 | Radio frequency power amplifier, chip and communication terminal for reducing load change sensitivity |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983343A (en) * | 2020-07-22 | 2020-11-24 | 宁波燕清汽车技术有限公司 | Current type wheel speed sensor acquisition circuit |
| CN112653403A (en) * | 2020-12-24 | 2021-04-13 | 唯捷创芯(天津)电子技术股份有限公司 | Radio frequency power amplifier, chip and communication terminal for reducing load change sensitivity |
| CN112653403B (en) * | 2020-12-24 | 2023-03-14 | 唯捷创芯(天津)电子技术股份有限公司 | Radio frequency power amplifier, chip and communication terminal for reducing load change sensitivity |
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