技术领域technical field
本发明涉及一种特高压直流输电线路与边界对高频量衰减作用大小的界定方法，属于特高压直流输电技术领域。The invention relates to a method for defining the attenuation effect of an ultra-high voltage direct current transmission line and a boundary on high-frequency quantities, and belongs to the technical field of ultra-high voltage direct current transmission.
背景技术Background technique
目前，公知的特高压直流输电线路与边界对故障暂态信号高频分量的衰减特性为：特高压直流输电线路对高频量有衰减作用，线路越长，衰减作用越强烈；由平波电抗器、直流滤波器及PLC滤波器构成的特高压直流输电线路边界对高频量有很强的衰减作用。对同一个高频暂态信号，是线路还是边界的衰减作用大？目前尚未给出明确的界定方法。有必要研究特高压直流输电线路与边界对高频量衰减作用大小的界定方法。At present, the known attenuation characteristics of UHVDC transmission lines and boundaries on high-frequency components of fault transient signals are: UHVDC transmission lines have an attenuation effect on high-frequency components, and the longer the line, the stronger the attenuation effect; The boundary of UHV DC transmission line composed of filter, DC filter and PLC filter has a strong attenuation effect on high frequency. For the same high-frequency transient signal, is the attenuation effect of the line or the boundary greater? There is no clear definition method yet. It is necessary to study the method of defining the attenuation effect of UHVDC transmission lines and boundaries on high-frequency quantities.
发明内容Contents of the invention
本发明提供了一种特高压直流输电线路与边界对高频量衰减作用大小的界定方法，以用于解决特高压直流输电线路与边界对高频量衰减作用大小的界定的问题。The invention provides a method for defining the attenuation effect of UHVDC transmission lines and boundaries on high-frequency quantities, which is used to solve the problem of defining the attenuation effects of UHVDC transmission lines and boundaries on high-frequency quantities.
本发明的技术方案是：一种特高压直流输电线路与边界对高频量衰减作用大小的界定方法，首先根据直流线路上故障点的高频暂态信号通过长度为x的特高压直流输电线路到达保护装置后的高频暂态信号与直流线路上故障点的高频暂态信号相除取模得到特高压直流输电线路对高频量的衰减为；然后利用直流母线故障点的高频暂态信号通过特高压直流输电线路边界到达保护装置后的高频暂态信号与直流母线故障点的高频暂态信号相除取模得到特高压直流输电边界对高频量的衰减为；最后根据与之间的大小关系来实现特高压直流输电线路与边界对高频量衰减作用大小的界定。The technical solution of the present invention is: a method for defining the attenuation effect of UHVDC transmission lines and boundaries on high-frequency quantities, firstly according to the high-frequency transient signals of fault points on the DC line The high-frequency transient signal after reaching the protection device through the UHVDC transmission line of length x High-frequency transient signals at the fault point on the DC line The attenuation of the UHVDC transmission line to the high frequency is obtained by phase division and modulus ; Then use the high-frequency transient signal at the fault point of the DC bus High-frequency transient signal after passing through the boundary of UHVDC transmission line and reaching the protection device High frequency transient signal with DC bus fault point The attenuation of the UHVDC boundary to the high frequency is obtained by phase division and modulus: ;finally based on and To realize the definition of the attenuation effect of UHVDC transmission lines and boundaries on high-frequency quantities.
所述根据与之间的大小关系来实现特高压直流输电线路与边界对高频量衰减作用大小的界定方法如下：Said basis and The size relationship between UHVDC transmission lines and boundaries to define the magnitude of the attenuation of high-frequency quantities is as follows:
当时，则表示线路的衰减小于边界的衰减；when When , it means that the attenuation of the line is smaller than the attenuation of the boundary;
当时，则表示线路的衰减等于边界的衰减；when When , it means that the attenuation of the line is equal to the attenuation of the boundary;
当时，则表示线路的衰减大于边界的衰减；when When , it means that the attenuation of the line is greater than the attenuation of the boundary;
式中：x为特高压直流输电线路长度，为特高压直流输电线路传播系数的实部，为特高压直流输电线路边界的传递函数的幅值。In the formula: x is the length of the UHV DC transmission line, is the propagation coefficient of the UHVDC transmission line the real part of is the magnitude of the transfer function at the boundary of the UHVDC transmission line.
本发明的工作原理是：The working principle of the present invention is:
已知特高压直流输电线路的导线几何尺寸、分布与位置、杆塔结构等，可以计算出线路的相模频变参数，进而得到该线路的线路传播系数；利用平波电抗器、直流滤波器、PLC滤波器的参数，可以得到由平波电抗器、直流滤波器、PLC滤波器所构成特高压直流输电线路边界的传递函数。Knowing the geometric size, distribution and position of the wires of the UHVDC transmission line, the structure of the tower, etc., the phase mode frequency variation parameters of the line can be calculated, and then the line propagation coefficient of the line can be obtained ;Using the parameters of the smoothing reactor, DC filter and PLC filter, the transfer function of the boundary of the UHV DC transmission line composed of the smoothing reactor, DC filter and PLC filter can be obtained.
对于安装在整流侧的保护装置，特高压直流系统整流侧直流母线故障产生的暂态电压高频分量通过特高压直流输电线路边界的衰减后到达保护装置安装处；特高压直流输电线路故障产生的暂态电压高频分量通过特高压直流输电线路的衰减后到达保护装置安装处，线路越长，衰减越强烈。For the protection device installed on the rectification side, the high-frequency component of the transient voltage generated by the fault of the DC busbar on the rectification side of the UHVDC system reaches the installation place of the protection device after being attenuated by the boundary of the UHVDC transmission line; The high-frequency component of the transient voltage reaches the place where the protection device is installed after being attenuated by the UHV DC transmission line. The longer the line, the stronger the attenuation.
对于逆变侧边界与线路对高频量衰减作用与整流侧等同。The attenuation effect of the boundary and line on the inverter side is the same as that on the rectifier side.
特高压直流输电线路边界传递函数的幅值能代表边界对高频量的衰减特性，而特高压直流输电线路对高频量的衰减则由特高压直流输电线路的衰减系数（取线路传播系数的实部得到特高压直流输电线路的衰减系数）和线路长度x决定。所以利用特高压直流输电线路的衰减系数和边界传递函数的幅值，就能界定特高直流输电线路边界与长度为x的特高直流输电线路对高频量衰减作用的大小。Amplitude of Boundary Transfer Function of UHVDC Transmission Lines can represent the attenuation characteristics of the boundary to high-frequency quantities, and the attenuation of UHV DC transmission lines to high-frequency quantities is determined by the attenuation coefficient of UHVDC transmission lines (Take the line propagation coefficient The real part of the attenuation coefficient of the UHVDC transmission line is obtained ) and line length x determined. Therefore, using the attenuation coefficient of the UHV DC transmission line and the magnitude of the boundary transfer function , can define the attenuation effect of the ultra-high DC transmission line boundary and the ultra-high DC transmission line with a length of x on the high-frequency quantity.
本发明的有益效果是：可以有效地界定特高直流输电线路与边界对高频量衰减作用的大小。The beneficial effect of the invention is that the attenuation effect of the ultra-high direct current transmission line and the boundary on the high-frequency quantity can be effectively defined.
附图说明Description of drawings
图1为本发明的结构示意图；Fig. 1 is a structural representation of the present invention;
图中各标号为：1为整流侧交流系统、2为整流桥、3为整流侧保护装置、4为直流线路、5为逆变桥、6为逆变侧交流系统、7为整流侧平波电抗器、8为逆变侧平波电抗器、9为整流侧直流滤波器、10为逆变侧直流滤波器、11为整流侧PLC滤波器、12为逆变侧PLC滤波器、13为整流侧接地装置、14为逆变侧接地装置。The labels in the figure are: 1 is the AC system on the rectifier side, 2 is the rectifier bridge, 3 is the protection device on the rectifier side, 4 is the DC line, 5 is the inverter bridge, 6 is the AC system on the inverter side, 7 is the flat wave on the rectifier side Reactor, 8 is inverter side smoothing reactor, 9 is rectification side DC filter, 10 is inverter side DC filter, 11 is rectification side PLC filter, 12 is inverter side PLC filter, 13 is rectification The side grounding device, 14 is the inverter side grounding device.
具体实施方式detailed description
实施例1：如图1所示，一种特高压直流输电线路与边界对高频量衰减作用大小的界定方法，首先根据直流线路上故障点的高频暂态信号通过长度为x的特高压直流输电线路到达保护装置后的高频暂态信号与直流线路上故障点的高频暂态信号相除取模得到特高压直流输电线路对高频量的衰减为；然后利用直流母线故障点的高频暂态信号通过特高压直流输电线路边界到达保护装置后的高频暂态信号与直流母线故障点的高频暂态信号相除取模得到特高压直流输电边界对高频量的衰减为；最后根据与之间的大小关系来实现特高压直流输电线路与边界对高频量衰减作用大小的界定。Embodiment 1: As shown in Figure 1, a method for defining the attenuation effect of UHVDC transmission lines and boundaries on high-frequency quantities, firstly, according to the high-frequency transient signals of fault points on the DC line The high-frequency transient signal after reaching the protection device through the UHVDC transmission line of length x High-frequency transient signals at the fault point on the DC line The attenuation of the UHVDC transmission line to the high frequency is obtained by phase division and modulus ; Then use the high-frequency transient signal at the fault point of the DC bus High-frequency transient signal after passing through the boundary of UHVDC transmission line and reaching the protection device High frequency transient signal with DC bus fault point The attenuation of the UHVDC boundary to the high frequency is obtained by phase division and modulus: ;finally based on and To realize the definition of the attenuation effect of UHVDC transmission lines and boundaries on high-frequency quantities.
所述根据与之间的大小关系来实现特高压直流输电线路与边界对高频量衰减作用大小的界定方法如下：Said basis and The size relationship between UHVDC transmission lines and boundaries to define the magnitude of the attenuation of high-frequency quantities is as follows:
当时，则表示线路的衰减小于边界的衰减；when When , it means that the attenuation of the line is smaller than the attenuation of the boundary;
当时，则表示线路的衰减等于边界的衰减；when When , it means that the attenuation of the line is equal to the attenuation of the boundary;
当时，则表示线路的衰减大于边界的衰减；when When , it means that the attenuation of the line is greater than the attenuation of the boundary;
式中：x为特高压直流输电线路长度，为特高压直流输电线路传播系数的实部，为特高压直流输电线路边界的传递函数的幅值。In the formula: x is the length of the UHV DC transmission line, is the propagation coefficient of the UHVDC transmission line the real part of is the magnitude of the transfer function at the boundary of the UHVDC transmission line.
实施例2：如图1所示，一种特高压直流输电线路与边界对高频量衰减作用大小的界定方法，整流侧平波电抗器7、整流侧直流滤波器9、整流侧PLC滤波器11构成特高压直流输电线路整流侧边界，直流线路上故障点d2与整流侧保护装置3之间的线路长度为。设作用于整流侧直流母线故障点d1和直流线路4上故障点d2的高频暂态信号为同一个高频暂态信号，直流线路4上故障点d2的通过长度为x的特高压直流输电线路到达整流侧保护装置3后该高频暂态信号变为；整流侧直流母线故障点d1的通过特高压直流输电线路整流侧边界到达整流侧保护装置3后该高频暂态信号变为，则有 ；；将和左右分别相除，得到x与之间的关系：当特高压直流输电线路长度x小于时，线路对频率为高频量的衰减作用将小于边界的衰减作用；当特高压直流输电线路长度x等于时，线路对频率为高频量的衰减作用将等于边界的衰减作用；当特高压直流输电线路长度x大于时，线路对频率为高频量的衰减作用将大于边界的衰减作用。其中，x为故障点d2与整流侧保护装置3之间的线路长度为x，为特高压直流输电线路传播系数的实部，即衰减系数，为特高压直流输电线路边界的传递函数的幅值。Embodiment 2: As shown in Figure 1, a method for defining the attenuation effect of UHV DC transmission lines and boundaries on high-frequency quantities, the rectification-side smoothing reactor 7, the rectification-side DC filter 9, and the rectification-side PLC filter 11 constitutes the boundary of the rectification side of the UHVDC transmission line, and the length of the line between the fault point d2 on the DC line and the protection device 3 on the rectification side is . Assume that the high-frequency transient signal acting on the fault point d1 of the DC bus on the rectifier side and the fault point d2 on the DC line 4 is the same high-frequency transient signal , the fault point d2 on DC line 4 The high-frequency transient signal becomes ; DC bus fault point d1 on the rectifier side The high-frequency transient signal becomes , then there is ; ;Will and Divide left and right respectively to get x and The relationship between: when the UHVDC transmission line length x is less than When , the line pair frequency is The attenuation effect of the high-frequency quantity will be smaller than the attenuation effect of the boundary; when the UHV DC transmission line length x is equal to When , the line pair frequency is The attenuation effect of the high-frequency quantity will be equal to the attenuation effect of the boundary; when the UHVDC transmission line length x is greater than When , the line pair frequency is The attenuation effect of the high frequency amount will be greater than the attenuation effect of the boundary. Among them, x is the line length between the fault point d2 and the rectifier side protection device 3, and is the real part of the UHVDC transmission line propagation coefficient, that is, the attenuation coefficient, is the magnitude of the transfer function at the boundary of the UHVDC transmission line.
另外，对于逆变侧边界与线路对高频量衰减作用的界定过程与上述实施例2中所述整流侧边界与线路对高频量衰减作用的界定过程相同。In addition, the process of defining the attenuation effect of the boundary of the inverter side and the line on the high-frequency quantity is the same as the process of defining the attenuation effect of the boundary of the rectification side and the line on the high-frequency quantity in the above-mentioned embodiment 2.
上面结合附图对本发明的具体实施方式作了详细说明，但是本发明并不限于上述实施方式，在本领域普通技术人员所具备的知识范围内，还可以在不脱离本发明宗旨的前提下作出各种变化。The specific implementation of the present invention has been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned implementation, within the knowledge of those of ordinary skill in the art, it can also be made without departing from the gist of the present invention. Variations.
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| CN201310506651.3ACN103543358B (en) | 2013-10-24 | 2013-10-24 | A kind of extra high voltage direct current transmission line and the border confining method to high frequency content attenuation size |
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| CN201310506651.3ACN103543358B (en) | 2013-10-24 | 2013-10-24 | A kind of extra high voltage direct current transmission line and the border confining method to high frequency content attenuation size |
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