CN108594034A - Voltage sag monitoring device and method suitable for frequency converter - Google Patents
Voltage sag monitoring device and method suitable for frequency converter Download PDFInfo
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Abstract
本发明提供一种适用于变频器的电压暂降监测装置及方法，其中，电压暂降监测装置包括：通过总线板相互连接的主控板、交流电压检测板、直流电压检测板和逆变电压检测板；交流电压检测板通过电压互感器连接变频器的输入侧，用于检测变频器的输入侧交流电压；直流电压检测板通过直流电压变送器连接变频器的整流滤波侧，用于检测变频器的整流滤波电压；逆变电压检测板通过变压器连接变频器的输出侧，用于检测变频器的逆变输出电压。本发明能同时对变频器输入侧交流电压、变频器整流滤波电压以及变频器逆变输出电压进行监测；将变频器逆变输出电压的脉冲调制波形转换成正弦波，从而实现对变频器逆变输出电压的监测，同时本发明装置还具有频率跟踪功能。
The invention provides a voltage sag monitoring device and method suitable for frequency converters, wherein the voltage sag monitoring device includes: a main control board, an AC voltage detection board, a DC voltage detection board and an inverter voltage Detection board; the AC voltage detection board is connected to the input side of the inverter through a voltage transformer, and is used to detect the AC voltage on the input side of the inverter; the DC voltage detection board is connected to the rectification and filtering side of the inverter through a DC voltage transmitter, and is used to detect The rectified and filtered voltage of the inverter; the inverter voltage detection board is connected to the output side of the inverter through a transformer to detect the inverter output voltage of the inverter. The invention can simultaneously monitor the AC voltage at the input side of the frequency converter, the rectification and filtering voltage of the frequency converter and the inverter output voltage of the frequency converter; convert the pulse modulation waveform of the inverter output voltage of the frequency converter into a sine wave, thereby realizing the inverter inverter The monitoring of the output voltage, meanwhile, the device of the present invention also has the function of frequency tracking.
Description
技术领域technical field
本发明涉及电力系统技术领域，尤其涉及一种适用于变频器的电压暂降监测装置及方法。The invention relates to the technical field of power systems, in particular to a voltage sag monitoring device and method suitable for frequency converters.
背景技术Background technique
在当今工业社会，变频器凭其体积小、精度高、可靠性强以及节能环保的特点，已在电力、石化、医疗、纺织、机械等行业得到广泛应用。然而变频器属于敏感设备，供电侧发生电压暂降容易使其发生宕机，进而影响负载的正常运行。变频器主回路由整流电路、滤波电路和逆变电路组成，电压暂降对于变频器主回路的各个环节将产生不同影响，从而使变频器输出电压对负载也会产生影响，目前的监测装置只是监测变频器的供电侧电压，但是监测变频器的整流滤波电压和逆变输出电压具有重要的应用价值，因为监测变频器的整流滤波电压和逆变输出电压后才可进一步分析出电压暂降对变频器各个电压回路以及负载的影响。In today's industrial society, frequency converters have been widely used in electric power, petrochemical, medical, textile, machinery and other industries due to their small size, high precision, strong reliability, energy saving and environmental protection. However, the frequency converter is a sensitive device, and a voltage sag on the power supply side can easily cause it to shut down, thereby affecting the normal operation of the load. The main circuit of the inverter is composed of a rectifier circuit, a filter circuit and an inverter circuit. The voltage sag will have different effects on each link of the main circuit of the inverter, so that the output voltage of the inverter will also affect the load. The current monitoring device is only Monitoring the power supply side voltage of the inverter, but monitoring the rectification and filtering voltage and inverter output voltage of the inverter has important application value, because the impact of voltage sag can be further analyzed after monitoring the rectification and filtering voltage and inverter output voltage of the inverter. The impact of each voltage circuit of the inverter and the load.
发明内容Contents of the invention
本发明所要解决的技术问题在于，提供一种适用于变频器的电压暂降监测装置，以同时监测变频器输入侧交流电压、变频器整流滤波电压以及变频器逆变输出电压及方法。The technical problem to be solved by the present invention is to provide a voltage sag monitoring device suitable for frequency converters to simultaneously monitor the AC voltage at the input side of the frequency converter, the rectified and filtered voltage of the frequency converter, and the inverter output voltage of the frequency converter and the method.
为了解决上述技术问题，本发明提供一种适用于变频器的电压暂降监测装置，包括：In order to solve the above technical problems, the present invention provides a voltage sag monitoring device suitable for frequency converters, including:
通过总线板相互连接的主控板、交流电压检测板、直流电压检测板和逆变电压检测板；The main control board, AC voltage detection board, DC voltage detection board and inverter voltage detection board are connected to each other through the bus board;
所述交流电压检测板通过电压互感器连接变频器的输入侧，用于检测变频器的输入侧交流电压；The AC voltage detection board is connected to the input side of the frequency converter through a voltage transformer, and is used to detect the AC voltage of the input side of the frequency converter;
所述直流电压检测板通过直流电压变送器连接变频器的整流滤波侧，用于检测变频器的整流滤波电压；The DC voltage detection board is connected to the rectification and filtering side of the frequency converter through a DC voltage transmitter, and is used to detect the rectification and filtering voltage of the frequency converter;
所述逆变电压检测板通过变压器连接变频器的输出侧，用于检测变频器的逆变输出电压。The inverter voltage detection board is connected to the output side of the frequency converter through a transformer, and is used for detecting the inverter output voltage of the frequency converter.
其中，所述电压暂降监测装置还包括显示板，所述主控板、交流电压检测板、直流电压检测板和逆变电压检测板均通过总线板与所述显示板连接。Wherein, the voltage sag monitoring device further includes a display board, and the main control board, AC voltage detection board, DC voltage detection board and inverter voltage detection board are all connected to the display board through a bus board.
其中，所述电压暂降监测装置还包括电源板，所述主控板、交流电压检测板、直流电压检测板和逆变电压检测板均通过总线板与所述电源板连接。Wherein, the voltage sag monitoring device further includes a power board, and the main control board, AC voltage detection board, DC voltage detection board and inverter voltage detection board are all connected to the power board through a bus board.
其中，所述逆变电压检测板上设有中央处理器、LC滤波器和过零比较器，所述LC滤波器的输入端连接所述变压器的输出侧，所述变压器的输入侧连接变频器逆变输出电压，所述中央处理器的输入端分别连接所述LC滤波器的输出端和所述过零比较器的输出端，所述中央处理器的输出端连接所述主控板。Wherein, the inverter voltage detection board is provided with a central processing unit, an LC filter and a zero-crossing comparator, the input end of the LC filter is connected to the output side of the transformer, and the input side of the transformer is connected to the frequency converter Inverting the output voltage, the input end of the central processing unit is respectively connected to the output end of the LC filter and the output end of the zero-crossing comparator, and the output end of the central processing unit is connected to the main control board.
其中，变频器的逆变输出电压经所述变压器后转换为小信号正弦脉冲宽度调制波形，所述LC滤波器用于将变压器输出的所述小信号正弦脉冲宽度调制波形转换为正弦波，所述过零比较器用于将所述正弦波转换为方波，所述中央处理器用于对所述方波进行计数，计算出所述正弦波的频率，再设定采样频率。Wherein, the inverter output voltage of the frequency converter is converted into a small-signal sinusoidal pulse width modulation waveform after being passed through the transformer, and the LC filter is used to convert the small-signal sinusoidal pulse width modulation waveform output by the transformer into a sine wave. The zero-crossing comparator is used to convert the sine wave into a square wave, and the central processing unit is used to count the square wave, calculate the frequency of the sine wave, and then set the sampling frequency.
其中，所述LC滤波器具体包括滤波电感、滤波电容和采样电阻，所述过零比较器具体包括运算放大器和限流电阻，所述滤波电感的一端连接所述变压器的输出侧的第一端，另一端连接所述滤波电容，所述滤波电容的另一端连接所述变压器的输出侧的第二端，所述采样电阻并联在所述滤波电容两端，所述采样电阻的一端通过所述限流电阻连接所述运算放大器的反向输入端，所述采样电阻的另一端连接所述运算放大器的同向输入端，所述运算放大器的输出端连接所述逆变电压检测板中的中央处理器的输入端。Wherein, the LC filter specifically includes a filter inductor, a filter capacitor and a sampling resistor, the zero-crossing comparator specifically includes an operational amplifier and a current limiting resistor, and one end of the filter inductor is connected to the first end of the output side of the transformer , the other end is connected to the filter capacitor, the other end of the filter capacitor is connected to the second end of the output side of the transformer, the sampling resistor is connected in parallel to both ends of the filter capacitor, and one end of the sampling resistor passes through the The current limiting resistor is connected to the inverting input terminal of the operational amplifier, the other end of the sampling resistor is connected to the same input terminal of the operational amplifier, and the output terminal of the operational amplifier is connected to the center of the inverter voltage detection board. input to the processor.
其中，所述主控板上设有存储器，当所述输入侧交流电压发生电压暂降时，所述存储器对所述输入侧交流电压、整流滤波电压和逆变输出电压的采样数据进行存储。Wherein, the main control board is provided with a memory, and when the input-side AC voltage sags, the memory stores the sampling data of the input-side AC voltage, rectified and filtered voltage, and inverter output voltage.
本发明还提供一种适用于变频器的电压暂降监测方法，包括：The present invention also provides a voltage sag monitoring method suitable for frequency converters, including:
提供通过总线板相互连接的主控板、交流电压检测板、直流电压检测板和逆变电压检测板；Provide the main control board, AC voltage detection board, DC voltage detection board and inverter voltage detection board connected to each other through the bus board;
将所述交流电压检测板通过电压互感器连接变频器的输入侧，检测变频器的输入侧交流电压；Connect the AC voltage detection board to the input side of the frequency converter through a voltage transformer, and detect the AC voltage at the input side of the frequency converter;
将所述直流电压检测板通过直流电压变送器连接变频器的整流滤波侧，检测变频器的整流滤波电压；Connect the DC voltage detection board to the rectification and filtering side of the frequency converter through a DC voltage transmitter to detect the rectification and filtering voltage of the frequency converter;
将所述逆变电压检测板通过变压器连接变频器的输出侧，检测变频器的逆变输出电压。The inverter voltage detection board is connected to the output side of the frequency converter through a transformer to detect the inverter output voltage of the frequency converter.
其中，所述电压暂降监测方法还包括：Wherein, the voltage sag monitoring method also includes:
在所述逆变电压检测板上设置中央处理器、LC滤波器和过零比较器，将所述LC滤波器的输入端连接所述变压器的输出侧，所述变压器的输入侧连接变频器逆变输出电压，所述中央处理器的输入端分别连接所述LC滤波器的输出端和所述过零比较器的输出端，所述中央处理器的输出端连接所述主控板。A central processing unit, an LC filter, and a zero-crossing comparator are set on the inverter voltage detection board, and the input end of the LC filter is connected to the output side of the transformer, and the input side of the transformer is connected to the inverter inverter. variable output voltage, the input end of the central processing unit is respectively connected to the output end of the LC filter and the output end of the zero-crossing comparator, and the output end of the central processing unit is connected to the main control board.
其中，所述检测变频器的逆变输出电压具体包括：Wherein, the detection of the inverter output voltage of the frequency converter specifically includes:
变频器的逆变输出电压经所述变压器后转换为小信号正弦脉冲宽度调制波形；The inverter output voltage of the frequency converter is converted into a small signal sinusoidal pulse width modulation waveform after being passed through the transformer;
将变压器输出的所述小信号正弦脉冲宽度调制波形转换为正弦波；Converting the small-signal sinusoidal pulse width modulation waveform output by the transformer into a sine wave;
将所述正弦波转换为方波，对所述方波进行计数，计算出所述正弦波的频率，再设定采样频率。The sine wave is converted into a square wave, the square wave is counted, the frequency of the sine wave is calculated, and the sampling frequency is set.
本发明实施例的有益效果在于：能同时对变频器输入侧交流电压、变频器整流滤波电压以及变频器逆变输出电压进行监测，通过电路设计将变频器逆变输出电压的脉冲调制波形转换成正弦波，从而实现对变频器逆变输出电压的监测，同时还具有频率跟踪功能以及同时对变频器输入交流电压、整流滤波电压和逆变输出电压进行录波的录波功能。The beneficial effect of the embodiment of the present invention is that the AC voltage at the input side of the frequency converter, the rectified and filtered voltage of the frequency converter, and the inverter output voltage of the frequency converter can be monitored at the same time, and the pulse modulation waveform of the inverter output voltage of the frequency converter is converted into Sine wave, so as to realize the monitoring of the inverter output voltage of the inverter, and also has the frequency tracking function and the wave recording function of recording the input AC voltage of the inverter, the rectified and filtered voltage and the inverter output voltage at the same time.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.
图1为本发明适用于变频器的电压暂降监测装置的系统原理图。FIG. 1 is a system schematic diagram of a voltage sag monitoring device applicable to a frequency converter according to the present invention.
图2为变频器各个电压回路的电压波形转换图。Figure 2 is a voltage waveform conversion diagram of each voltage loop of the frequency converter.
图3为本发明适用于变频器的电压暂降监测装置对变频器逆变输出电压的检测原理图。Fig. 3 is a schematic diagram of detection of the inverter output voltage of the inverter by the voltage sag monitoring device applicable to the inverter according to the present invention.
图4为本发明适用于变频器的电压暂降监测装置对变频器逆变输出电压的检测电路图。Fig. 4 is a circuit diagram of the detection circuit of the inverter output voltage of the inverter by the voltage sag monitoring device applicable to the inverter according to the present invention.
图5为本发明适用于变频器的电压暂降监测装置对变频器逆变输出电压的波形转换图。Fig. 5 is a waveform conversion diagram of the inverter output voltage of the frequency converter by the voltage sag monitoring device applicable to the frequency converter according to the present invention.
具体实施方式Detailed ways
以下各实施例的说明是参考附图，用以示例本发明可以用以实施的特定实施例。The following descriptions of various embodiments refer to the accompanying drawings to illustrate specific embodiments in which the present invention can be implemented.
如图1所示，本发明实施例一提供一种适用于变频器的电压暂降监测装置，包括主控板、交流电压检测板、直流电压检测板、逆变电压检测板、显示板以及电源板；主控板、交流电压检测板、直流电压检测板、逆变电压检测板、显示板以及电源板通过总线板相互连接；交流电压检测板通过电压互感器（PT）连接变频器的输入侧，用来检测变频器的输入侧交流电压；直流电压检测板通过直流电压变送器连接变频器的整流滤波侧，用来检测变频器的整流滤波电压；逆变电压检测板通过变压器连接变频器的输出侧，用来检测变频器逆变输出电压。本发明装置的三个检测板（交流电压检测板、直流电压检测板和逆变电压检测板）实时监测输入交流电压，整流滤波电压和逆变输出电压，当输入侧交流电压发生电压暂降的时候，触发装置的录波功能（主控板上有存储器，装置录波是对采样数据的存储），装置同时对三路电压（输入交流电压，整流滤波电压和逆变输出电压）进行录波。本装置通过录波功能可分析电压暂降对变频器各个电压回路的影响，进而分析出电压暂降时变频器输出电压对负载的影响。As shown in Figure 1, Embodiment 1 of the present invention provides a voltage sag monitoring device suitable for frequency converters, including a main control board, an AC voltage detection board, a DC voltage detection board, an inverter voltage detection board, a display board, and a power supply board; the main control board, AC voltage detection board, DC voltage detection board, inverter voltage detection board, display board and power board are connected to each other through the bus board; the AC voltage detection board is connected to the input side of the inverter through a voltage transformer (PT) , used to detect the AC voltage on the input side of the inverter; the DC voltage detection board is connected to the rectification and filtering side of the inverter through a DC voltage transmitter to detect the rectification and filtering voltage of the inverter; the inverter voltage detection board is connected to the inverter through a transformer The output side of the inverter is used to detect the inverter output voltage of the inverter. The three detection boards (AC voltage detection board, DC voltage detection board and inverter voltage detection board) of the device of the present invention monitor the input AC voltage, the rectified and filtered voltage and the inverter output voltage in real time. At this time, trigger the wave recording function of the device (there is a memory on the main control board, and the wave recording of the device is to store the sampling data), and the device simultaneously records three voltages (input AC voltage, rectified and filtered voltage and inverter output voltage) . This device can analyze the impact of voltage sag on each voltage circuit of the inverter through the wave recording function, and then analyze the impact of the output voltage of the inverter on the load when the voltage sags.
如图2所示，变频器输入电压的波形为交流正弦波，经过整流滤波电路后变成直流波形，然后经过逆变电路后变成调制脉冲波形。As shown in Figure 2, the waveform of the inverter input voltage is an AC sine wave, which becomes a DC waveform after passing through the rectification and filtering circuit, and then becomes a modulated pulse waveform after passing through the inverter circuit.
如图3所示，本发明适用于变频器的电压暂降监测装置中逆变电压检测板上设有中央处理器CPU、LC滤波器和过零比较器，变压器T的输入侧连接变频器逆变输出电压，变压器T的输出侧连接LC滤波器的输入端；LC滤波器的输出端连接过零比较器的输入端，逆变电压检测板中CPU输入端分别连接LC滤波器的输出端和过零比较器的输出端；CPU输出端连接主控板。变频器逆变输出电压经过变压器后变成小信号的SPWM（Sinusoidal PWM，正弦脉冲宽度调制）波形，小信号SPWM波形经过LC滤波器后变成正弦波，正弦波经过过零比较器后变成方波，逆变电压检测板的CPU通过对上述方波进行计数，计算出正弦波的频率，再设定采样频率，从而达到频率跟踪处理。As shown in Fig. 3, the present invention is suitable for the voltage sag monitoring device of the frequency converter. The inverter voltage detection board is equipped with a central processing unit CPU, an LC filter and a zero-crossing comparator, and the input side of the transformer T is connected to the inverter inverter. To change the output voltage, the output side of the transformer T is connected to the input terminal of the LC filter; the output terminal of the LC filter is connected to the input terminal of the zero-crossing comparator, and the input terminal of the CPU in the inverter voltage detection board is respectively connected to the output terminal of the LC filter and The output terminal of the zero-crossing comparator; the output terminal of the CPU is connected to the main control board. The inverter output voltage of the inverter becomes a small signal SPWM (Sinusoidal PWM, sinusoidal pulse width modulation) waveform after passing through the transformer, and the small signal SPWM waveform becomes a sine wave after passing through the LC filter, and the sine wave becomes a sine wave after passing through the zero-crossing comparator. Square wave, the CPU of the inverter voltage detection board calculates the frequency of the sine wave by counting the above square wave, and then sets the sampling frequency to achieve frequency tracking processing.
如图4所示，变频器逆变输出电压连接变压器T的输入侧，变压器T输出侧的第一端连接滤波电感L的一端，滤波电感L另一端连接滤波电容C，滤波电容C另一端连接变压器T输出侧的第二端，采样电阻R1并联在滤波电容C两端，采样电阻R1一端通过限流电阻R2连接到运算放大器A的反向输入端，采样电阻R1另一端连接到运算放大器A的同向输入端，运算放大器A的输出端连接逆变电压检测板中CPU输入端，逆变电压检测板中CPU输出端连接主控板。As shown in Figure 4, the inverter output voltage of the inverter is connected to the input side of the transformer T, the first end of the output side of the transformer T is connected to one end of the filter inductor L, the other end of the filter inductor L is connected to the filter capacitor C, and the other end of the filter capacitor C is connected to On the second end of the output side of the transformer T, the sampling resistor R1 is connected in parallel to both ends of the filter capacitor C, one end of the sampling resistor R1 is connected to the inverting input end of the operational amplifier A through the current limiting resistor R2, and the other end of the sampling resistor R1 is connected to the operational amplifier A The same direction input terminal of the operational amplifier A is connected to the CPU input terminal of the inverter voltage detection board, and the CPU output terminal of the inverter voltage detection board is connected to the main control board.
如图5所示，变频器逆变输出电压连接变压器，变频器逆变输出电压的波形（本身为调制脉冲波形）通过LC滤波器转换成正弦波后，再经过过零比较器得到方波，逆变电压检测板中CPU对方波进行计数并计算出当前正弦波的频率，然后调整对正弦波的采样频率，从而达到频率跟踪。本发明装置通过把变频器逆变输出电压的脉冲调制波形转换成正弦波后再进行监测。As shown in Figure 5, the inverter output voltage of the inverter is connected to the transformer. The waveform of the inverter output voltage (itself a modulated pulse waveform) is converted into a sine wave through an LC filter, and then a square wave is obtained through a zero-crossing comparator. The CPU in the inverter voltage detection board counts square waves and calculates the frequency of the current sine wave, and then adjusts the sampling frequency of the sine wave to achieve frequency tracking. The device of the invention converts the pulse modulation waveform of the inverter output voltage of the frequency converter into a sine wave before monitoring.
相应于本发明实施例一一种适用于变频器的电压暂降装置，本发明实施例二还提供一种适用于变频器的电压暂降监测方法，包括：Corresponding to Embodiment 1 of the present invention, a voltage sag device suitable for frequency converters, Embodiment 2 of the present invention also provides a voltage sag monitoring method suitable for frequency converters, including:
提供通过总线板相互连接的主控板、交流电压检测板、直流电压检测板和逆变电压检测板；Provide the main control board, AC voltage detection board, DC voltage detection board and inverter voltage detection board connected to each other through the bus board;
将所述交流电压检测板通过电压互感器连接变频器的输入侧，检测变频器的输入侧交流电压；Connect the AC voltage detection board to the input side of the frequency converter through a voltage transformer, and detect the AC voltage at the input side of the frequency converter;
将所述直流电压检测板通过直流电压变送器连接变频器的整流滤波侧，检测变频器的整流滤波电压；Connect the DC voltage detection board to the rectification and filtering side of the frequency converter through a DC voltage transmitter to detect the rectification and filtering voltage of the frequency converter;
将所述逆变电压检测板通过变压器连接变频器的输出侧，检测变频器的逆变输出电压。The inverter voltage detection board is connected to the output side of the frequency converter through a transformer to detect the inverter output voltage of the frequency converter.
其中，所述电压暂降监测方法还包括：Wherein, the voltage sag monitoring method also includes:
在所述逆变电压检测板上设置中央处理器、LC滤波器和过零比较器，将所述LC滤波器的输入端连接所述变压器的输出侧，所述变压器的输入侧连接变频器逆变输出电压，所述中央处理器的输入端分别连接所述LC滤波器的输出端和所述过零比较器的输出端，所述中央处理器的输出端连接所述主控板。A central processing unit, an LC filter, and a zero-crossing comparator are set on the inverter voltage detection board, and the input end of the LC filter is connected to the output side of the transformer, and the input side of the transformer is connected to the inverter inverter. variable output voltage, the input end of the central processing unit is respectively connected to the output end of the LC filter and the output end of the zero-crossing comparator, and the output end of the central processing unit is connected to the main control board.
其中，所述检测变频器的逆变输出电压具体包括：Wherein, the detection of the inverter output voltage of the frequency converter specifically includes:
变频器的逆变输出电压经所述变压器后转换为小信号正弦脉冲宽度调制波形；The inverter output voltage of the frequency converter is converted into a small signal sinusoidal pulse width modulation waveform after being passed through the transformer;
将变压器输出的所述小信号正弦脉冲宽度调制波形转换为正弦波；Converting the small-signal sinusoidal pulse width modulation waveform output by the transformer into a sine wave;
将所述正弦波转换为方波，对所述方波进行计数，计算出所述正弦波的频率，再设定采样频率。The sine wave is converted into a square wave, the square wave is counted, the frequency of the sine wave is calculated, and the sampling frequency is set.
本发明通过检测变频器输入侧交流电压，当发生电压暂降时同时录波变频器输入交流电压、变频器整流滤波电压和变频器逆变输出电压，通过对录波数据的进一步处理可分析出电压暂降对变频器整流滤波电压和变频器逆变输出电压的影响，进而分析出在电压暂降时变频器逆变输出电压对负载的影响。The invention detects the AC voltage on the input side of the frequency converter, and simultaneously records the input AC voltage of the frequency converter, the rectification and filtering voltage of the frequency converter, and the inverter output voltage of the frequency converter when a voltage sag occurs, and can analyze the wave recording data by further processing The impact of voltage sag on the rectified and filtered voltage of the inverter and the inverter output voltage of the inverter, and then analyze the influence of the inverter output voltage of the inverter on the load during the voltage sag.
综上所述，与现有技术相比，本发明实施例具有以下有益效果：能同时对变频器输入侧交流电压、变频器整流滤波电压以及变频器逆变输出电压进行监测，通过电路设计将变频器逆变输出电压的脉冲调制波形转换成正弦波，从而实现对变频器逆变输出电压的监测，同时还具有频率跟踪功能以及同时对变频器输入交流电压、整流滤波电压和逆变输出电压进行录波的录波功能。To sum up, compared with the prior art, the embodiment of the present invention has the following beneficial effects: the AC voltage at the input side of the frequency converter, the rectified and filtered voltage of the frequency converter and the inverter output voltage of the frequency converter can be monitored at the same time, and the The pulse modulation waveform of the inverter output voltage of the inverter is converted into a sine wave, so as to realize the monitoring of the inverter output voltage of the inverter, and also has the function of frequency tracking and simultaneously monitors the inverter input AC voltage, rectified and filtered voltage and inverter output voltage Wave recording function for wave recording.
以上所揭露的仅为本发明较佳实施例而已，当然不能以此来限定本发明之权利范围，因此依本发明权利要求所作的等同变化，仍属本发明所涵盖的范围。The above disclosures are only preferred embodiments of the present invention, and certainly cannot limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.
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