CN115113608A - Return pulse width measuring device of high-voltage direct-current transmission converter valve thyristor control unit - Google Patents
Return pulse width measuring device of high-voltage direct-current transmission converter valve thyristor control unit Download PDFInfo
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Abstract
本发明公开了一种高压直流输电换流阀晶闸管控制单元的回报脉宽测量装置，包括：控制装置和测量装置；其中，控制装置和测量装置分别与换流阀晶闸管控制单元TCU连接；所述控制装置用于：模拟换流阀状态，由所述TCU基于所述状态发送IP信号；所述测量装置用于：测量IP信号宽度。本发明可以自动测量IP信号宽度，判断IP信号宽度是否存在明显降低，方便检修人员能够在板卡故障前发现光功率衰减较大的TCU板卡，从而消除安全隐患。
The invention discloses a reporting pulse width measurement device for a converter valve thyristor control unit of high-voltage direct current transmission, comprising: a control device and a measurement device; wherein the control device and the measurement device are respectively connected with the converter valve thyristor control unit TCU; the The control device is used for: simulating the state of the converter valve, and the TCU sends the IP signal based on the state; the measuring device is used for: measuring the width of the IP signal. The invention can automatically measure the width of the IP signal, and judge whether the width of the IP signal is obviously reduced, so that the maintenance personnel can find the TCU board card with larger optical power attenuation before the board card fails, thereby eliminating the potential safety hazard.
Description
技术领域technical field
本发明涉及高压直流输电技术领域，尤其涉及高压直流输电换流阀晶闸管控制单元的回报脉宽测量装置。The invention relates to the technical field of high-voltage direct current power transmission, in particular to a return pulse width measurement device of a converter valve thyristor control unit of high-voltage direct current power transmission.
背景技术Background technique
本部分旨在为权利要求书中陈述的本发明实施例提供背景或上下文。此处的描述不因为包括在本部分中就承认是现有技术。This section is intended to provide a background or context to the embodiments of the invention recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section.
高压直流输电系统中，晶闸管控制单元TCU(Thyristor Control Unit)会持续监测换流阀的状态，并会将状态信息转换为光信号(以下简称IP信号)以不同的宽度通过光缆发送给阀控，阀控依据此信号来判断晶闸管的状态。其中，换流阀是高压直流输电系统的关键性设备，阀控系统是换流阀的控制和监视设备，阀控系统的稳定可靠工作是换流阀稳定运行的保障。In the HVDC transmission system, the thyristor control unit TCU (Thyristor Control Unit) will continuously monitor the status of the converter valve, and will convert the status information into optical signals (hereinafter referred to as IP signals) with different widths. The valve control judges the state of the thyristor according to this signal. Among them, the converter valve is the key equipment of the HVDC transmission system, the valve control system is the control and monitoring equipment of the converter valve, and the stable and reliable operation of the valve control system is the guarantee for the stable operation of the converter valve.
由于TCU板卡安装在换流阀上，而换流阀运行时的电流可达数千安培，导致板卡周围存在较大磁场。为了TCU板卡的可靠性，板卡上的电路几乎均以模拟电路搭建，且无任何逻辑器件，这就导致了TCU发送的IP信号并非规整的方波信号，所以光发射管的发射功率会直接影响到阀控接收到的IP信号脉冲宽度。若板卡长期使用，光发射管功率会逐渐下降，就会使IP信号宽度下降，最终将导致阀控无法准确识别IP信号，阀控有可能会误发故障告警导致换流阀跳闸，造成严重的经济损失。Since the TCU board is installed on the converter valve, and the current of the converter valve can reach thousands of amperes during operation, there is a large magnetic field around the board. For the reliability of the TCU board, almost all the circuits on the board are built with analog circuits without any logic devices, which leads to the fact that the IP signal sent by the TCU is not a regular square wave signal, so the transmit power of the light-emitting tube will It directly affects the pulse width of the IP signal received by the valve control. If the board is used for a long time, the power of the optical emission tube will gradually decrease, which will reduce the width of the IP signal, which will eventually cause the valve control to fail to accurately identify the IP signal. economic losses.
现今使用的测试仪虽然会对晶闸管控制单元的全功能进行测试，但不会对脉冲宽度进行测量，这就导致TCU在光发射管功率完全降低前是无法被检测出来的，若等到光发射管功率完全降低，阀控便无法准确判断换流阀的状态，从而会误发故障告警导致换流阀跳闸。Although the tester used today will test the full function of the thyristor control unit, it will not measure the pulse width, which results in that the TCU cannot be detected until the power of the light-emitting tube is completely reduced. When the power is completely reduced, the valve control cannot accurately judge the state of the converter valve, which will cause a false alarm to cause the converter valve to trip.
发明内容SUMMARY OF THE INVENTION
本发明实施例提供一种高压直流输电换流阀晶闸管控制单元的回报脉宽测量装置，用以解决TCU在长时间运行后光器件老化造成功率降低导致发送信号脉宽变窄但无法测量的问题，包括：控制装置和测量装置；其中，控制装置和测量装置分别与换流阀晶闸管控制单元TCU连接；The embodiment of the present invention provides a reporting pulse width measurement device for a thyristor control unit of a HVDC converter valve, which is used to solve the problem that the transmission signal pulse width is narrowed but cannot be measured due to the power reduction caused by the aging of the optical device after the TCU runs for a long time , including: a control device and a measurement device; wherein, the control device and the measurement device are respectively connected with the converter valve thyristor control unit TCU;
所述控制装置用于：模拟换流阀状态，由所述TCU基于所述状态发送IP信号；The control device is used to simulate the state of the converter valve, and the TCU sends an IP signal based on the state;
所述测量装置用于：测量IP信号宽度。The measuring device is used for: measuring the IP signal width.
本发明实施例中，与现有技术中只对晶闸管控制单元的全功能进行测试，但不会对脉冲宽度进行测量的技术方案相比，本发明通过包括的一个控制装置和一个测量装置，通过控制装置模拟换流阀状态，通过测量回路测量IP信号宽度，可以判断IP信号宽度是否存在明显降低，方便检修人员能够在板卡故障前发现光功率衰减较大的TCU板卡，从而消除安全隐患。In the embodiment of the present invention, compared with the technical solution in the prior art that only tests the full function of the thyristor control unit but does not measure the pulse width, the present invention includes a control device and a measurement device, The control device simulates the state of the converter valve, and measures the width of the IP signal by measuring the loop to determine whether the width of the IP signal is significantly reduced, which is convenient for maintenance personnel to find TCU boards with large optical power attenuation before the board fails, thereby eliminating potential safety hazards .
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。在附图中：In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying 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. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts. In the attached image:
图1为本发明实施例中高压直流输电换流阀晶闸管控制单元的回报脉宽测量装置的连接示意图；FIG. 1 is a schematic diagram of the connection of the reporting pulse width measuring device of the HVDC converter valve thyristor control unit in the embodiment of the present invention;
图2为本发明实施例中控制装置的连接示意图；Fig. 2 is the connection schematic diagram of the control device in the embodiment of the present invention;
图3为本发明实施例中T点和Y点的电压波形图；Fig. 3 is the voltage waveform diagram of T point and Y point in the embodiment of the present invention;
图4为本发明实施例中测量装置的连接示意图。FIG. 4 is a schematic diagram of the connection of the measuring device in the embodiment of the present invention.
具体实施方式Detailed ways
为使本发明实施例的目的、技术方案和优点更加清楚明白，下面结合附图对本发明实施例做进一步详细说明。在此，本发明的示意性实施例及其说明用于解释本发明，但并不作为对本发明的限定。In order to make the purposes, technical solutions and advantages of the embodiments of the present invention more clearly understood, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but not to limit the present invention.
现有技术中，TCU将换流阀的状态经过IP信号发送给阀控，不同的IP信号宽度代表了不同的状态，但光发射器件在长时间使用后光功率会逐渐降低，会导致阀控接收到的IP信号宽度降低，最终阀控无法正确判断换流阀的状态从而误发故障告警导致换流阀跳闸。由于现今的晶闸管控制单元测试装置均无法对IP信号的宽度进行测量，所以需要设计一种可以在低电压下使TCU发送所有种类的IP信号，并测量其宽度，同时可以和上一次同编号的板卡的测量结果进行对比，方便检修人员能够在板卡故障前发现光功率衰减较大的TCU板卡，从而消除安全隐患。In the prior art, the TCU sends the state of the converter valve to the valve control through an IP signal, and different IP signal widths represent different states, but the optical power of the light emitting device will gradually decrease after long-term use, which will cause the valve control. The width of the received IP signal is reduced, and finally the valve control cannot correctly judge the state of the converter valve, so a fault alarm is falsely issued and the converter valve is tripped. Since the current thyristor control unit test equipment cannot measure the width of the IP signal, it is necessary to design a method that can make the TCU send all kinds of IP signals under low voltage, and measure its width, and can also measure the width of the same number as the last time. By comparing the measurement results of the boards, it is convenient for maintenance personnel to find the TCU boards with large optical power attenuation before the board fails, thereby eliminating potential safety hazards.
基于此，本发明提供一种高压直流输电换流阀晶闸管控制单元的回报脉宽测量装置，如图1所示，该回报脉宽测量装置包括：控制装置和测量装置；其中，控制装置和测量装置分别与换流阀晶闸管控制单元TCU连接；Based on this, the present invention provides a report pulse width measurement device for a thyristor control unit of a HVDC converter valve. As shown in FIG. 1 , the report pulse width measurement device includes: a control device and a measurement device; wherein, the control device and the measurement device The devices are respectively connected with the converter valve thyristor control unit TCU;
所述控制装置用于：模拟换流阀状态，由所述TCU基于所述状态发送IP信号；The control device is used to simulate the state of the converter valve, and the TCU sends an IP signal based on the state;
所述测量装置用于：测量IP信号宽度。The measuring device is used for: measuring the IP signal width.
在一个实施例中，该回报脉宽测量装置还可以包括：电源开关，用于开启和关闭所述回报脉宽测量装置(未在图1中给出)。In one embodiment, the reported pulse width measurement device may further include: a power switch for turning on and off the reported pulse width measurement device (not shown in FIG. 1 ).
在一个实施例中，控制装置可以接220V市电，输出电压不会超过220V，不会产生高压，输出端可以提供合适的电压输出来让TCU发送所有种类的IP信号。In one embodiment, the control device can be connected to 220V commercial power, the output voltage will not exceed 220V, and no high voltage will be generated, and the output terminal can provide a suitable voltage output to allow the TCU to send all kinds of IP signals.
在一个实施例中，所述控制装置还用于：给所述TCU供电和/或所述测量装置供电。In one embodiment, the control device is further configured to: supply power to the TCU and/or the measurement device.
在一个实施例中，所述测量装置还用于：记录所述IP信号宽度，将当前次测量的IP信号宽度和上次测量的IP信号宽度进行比较，基于比较结果判断所述TCU是否故障。In one embodiment, the measuring device is further configured to: record the IP signal width, compare the IP signal width measured at the current time with the IP signal width measured last time, and judge whether the TCU is faulty based on the comparison result.
整个装置操作简便，只需打开电源开关，装置便可以自动进行测量和数据存储。The entire device is easy to operate, just turn on the power switch, and the device can automatically measure and store data.
在一个实施例中，如图2所示，所述控制装置可以包括隔离变压器和低压阻尼回路；其中，隔离变压器通过低压阻尼回路与所述TCU连接；In one embodiment, as shown in FIG. 2 , the control device may include an isolation transformer and a low-voltage damping circuit; wherein, the isolation transformer is connected to the TCU through the low-voltage damping circuit;
所述隔离变压器用于：将交流电压通过低压阻尼回路输出至所述TCU，由所述TCU基于所述交流电压判断所述换流阀的状态。The isolation transformer is used for: outputting an AC voltage to the TCU through a low-voltage damping circuit, and the TCU judges the state of the converter valve based on the AC voltage.
具体的，隔离变压器输出交流电压给低压阻尼回路，低压阻尼回路和TCU连接，当T点电压改变，TCU便会认为换流阀的状态改变，从而发送不同宽度的IP信号。Specifically, the isolation transformer outputs AC voltage to the low-voltage damping circuit, and the low-voltage damping circuit is connected to the TCU. When the voltage at point T changes, the TCU will consider that the state of the converter valve has changed, thereby sending IP signals of different widths.
在一个实施例中，如图2所示，所述低压阻尼回路包括采样电阻Rdc、阻尼电容CS和阻尼电阻RS；其中，采样电阻的一端和阻尼电容的一端连接，并与所述控制装置(L)连接，采样电阻的另一端与所述TCU的状态采样电路的一端T连接；阻尼电容的另一端与阻尼电阻的一端连接，阻尼电阻的另一端与所述TCU的充电电路的一端Y连接；所述TCU的状态采样电路的另一端N、所述TCU的充电电路的另一端N与所述控制装置连接。In one embodiment, as shown in FIG. 2 , the low-voltage damping loop includes a sampling resistor R dc , a damping capacitor C S and a damping resistor R S ; wherein one end of the sampling resistor is connected to one end of the damping capacitor, and is connected to the The control device (L) is connected, and the other end of the sampling resistor is connected to one end T of the state sampling circuit of the TCU; the other end of the damping capacitor is connected to one end of the damping resistor, and the other end of the damping resistor is connected to the charging circuit of the TCU. One end Y is connected; the other end N of the state sampling circuit of the TCU and the other end N of the charging circuit of the TCU are connected to the control device.
具体的，TCU是通过检测Udc上的电压来判断换流阀的状态，原理如图2所示，当隔离变压器的输出电压改变时，内部分压器的电压Udc开始改变，TCU则会在不同的Udc电压下发送不同宽度的IP信号。由于TCU的状态采样电路为纯阻性电路，所以只要Rdc的阻值足够小，就可以让原来最高需要8500V才能产生的正向过电压保护回报IP信号只需要220V就可以产生。Specifically, the TCU judges the state of the converter valve by detecting the voltage on U dc . The principle is shown in Figure 2. When the output voltage of the isolation transformer changes, the voltage of the internal voltage divider U dc begins to change, and the TCU will IP signals of different widths are sent under different U dc voltages. Since the state sampling circuit of the TCU is a purely resistive circuit, as long as the resistance value of R dc is small enough, the forward overvoltage protection return IP signal that originally required a maximum of 8500V can be generated with only 220V.
CS和RS为阻尼电容和阻尼电阻，负责给TCU充电。由于有CS的存在，会使Y点电压UY与T点电压UT相位相差90°，如图3所示。这样便能够保证电压UT在负向时UY为正，TCU就可以开始充电，确保TCU发送第一个IP信号前就有充足的电压，保证发送的IP信号宽度不会因自身电压不足而降低。C S and R S are damping capacitors and damping resistors, which are responsible for charging the TCU. Due to the existence of CS, the voltage U Y at point Y and the voltage U T at point T are 90° out of phase, as shown in Figure 3. In this way, it can be ensured that when the voltage U T is in the negative direction, U Y is positive, and the TCU can start charging, ensuring that there is sufficient voltage before the TCU sends the first IP signal, and ensuring that the width of the IP signal sent will not be caused by its own insufficient voltage. reduce.
在一个实施例中，如图2所示，所述控制装置还可以包括AC/DC单元，所述AC/DC单元与所述测量装置连接；In one embodiment, as shown in FIG. 2 , the control device may further include an AC/DC unit, and the AC/DC unit is connected to the measurement device;
所述AC/DC单元用于：将220V交流市电转换为24V直流电源给测量装置供电。The AC/DC unit is used for: converting 220V AC mains into 24V DC power to supply power to the measuring device.
在一个实施例中，如图4所示，所述测量装置包括光电转换电路和逻辑(Logic)电路；光电转换电路和逻辑电路连接；In one embodiment, as shown in FIG. 4 , the measuring device includes a photoelectric conversion circuit and a logic (Logic) circuit; the photoelectric conversion circuit and the logic circuit are connected;
其中，所述光电转换电路用于：将所述IP信号转换为电信号，并将电信号转换成方波信号；Wherein, the photoelectric conversion circuit is used for: converting the IP signal into an electrical signal, and converting the electrical signal into a square wave signal;
所述逻辑电路用于：基于所述方波信号确定IP信号宽度。The logic circuit is configured to: determine the IP signal width based on the square wave signal.
如图4所示，所述测量装置还包括数据记录模块，与所述逻辑电路连接，用于记录存储所述IP信号宽度，将当前次测量的IP信号宽度和上次测量的IP信号宽度进行比较，基于比较结果判断所述TCU是否故障。As shown in FIG. 4 , the measurement device further includes a data recording module, which is connected to the logic circuit and used to record and store the IP signal width, and record the current measured IP signal width and the last measured IP signal width. Comparing, and determining whether the TCU is faulty based on the comparison result.
如图4所示，所述光电转换电路包括光接收器和电压比较器；光接收器在收到光后，会产生一个固定的电流，电流经电阻转换成电压信号输入电压比较器“+”端。若“+”端电压大于“-”端电压Uref(Uref可通过对24V直流电压分压获得或直接使用自带Uref的电压比较器)，则比较器会输出方波信号，该方波信号宽度就为IP信号的宽度。As shown in Figure 4, the photoelectric conversion circuit includes an optical receiver and a voltage comparator; after receiving the light, the optical receiver will generate a fixed current, and the current will be converted into a voltage signal through a resistor and input to the voltage comparator "+" end. If the "+" terminal voltage is greater than the "-" terminal voltage U ref (U ref can be obtained by dividing the 24V DC voltage or directly use the voltage comparator with its own U ref ), the comparator will output a square wave signal. The width of the wave signal is the width of the IP signal.
所述光接收器用于：将所述IP信号转换为电信号；The optical receiver is used for: converting the IP signal into an electrical signal;
所述电压比较器用于：将电信号转换成方波信号。The voltage comparator is used for: converting the electrical signal into a square wave signal.
具体的，光电转换电路和阀控内的电路一致，保证同一个IP信号被测量装置和被阀控接收到的脉冲宽度是一致的。Specifically, the photoelectric conversion circuit is consistent with the circuit in the valve control to ensure that the pulse widths of the same IP signal received by the measuring device and the valve control are consistent.
数据记录模块可以记录被测TCU的编号(人为输入)和测量结果。The data logging module can record the number (human input) and measurement results of the TCU under test.
本发明实施例中，与现有技术中只对晶闸管控制单元的全功能进行测试，但不会对脉冲宽度进行测量的技术方案相比，本发明通过包括的一个控制装置和一个测量装置，通过控制装置模拟换流阀状态，通过测量回路测量IP信号宽度，可以获得如下有益效果：In the embodiment of the present invention, compared with the technical solution in the prior art that only tests the full function of the thyristor control unit but does not measure the pulse width, the present invention includes a control device and a measurement device, The control device simulates the state of the converter valve and measures the width of the IP signal through the measurement loop, and the following beneficial effects can be obtained:
(1)本发明所涉及的回报脉宽测量装置无高压设备，体积小，重量轻，使用简便，1个人即可进行测试。(1) The return pulse width measuring device involved in the present invention has no high-voltage equipment, is small in size, light in weight, easy to use, and can be tested by one person.
(2)本发明所涉及的回报脉宽测量可以对TCU单板进行测试，也可以在工程现场的换流阀上对安装好的TCU进行不拆线测试。(2) The return pulse width measurement involved in the present invention can be used to test the TCU single board, and can also test the installed TCU on the converter valve on the engineering site without removing the wires.
(3)本发明所涉及的回报脉宽测量装置可自动记录测量结果并和同编号的TCU上一次的测量记录进行对比，直观的显示该TCU的IP信号是否存在明显降低，方便检修人员能够在板卡故障前发现光功率衰减较大的TCU板卡，从而消除安全隐患。(3) The reporting pulse width measurement device involved in the present invention can automatically record the measurement results and compare them with the last measurement record of the TCU with the same number, so as to intuitively display whether the IP signal of the TCU has been significantly reduced, which is convenient for maintenance personnel to TCU boards with large optical power attenuation are found before the board fails, thereby eliminating potential safety hazards.
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.
以上所述的具体实施例，对本发明的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本发明的具体实施例而已，并不用于限定本发明的保护范围，凡在本发明的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above-mentioned specific embodiments are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
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