CN107769205A - A kind of Active Power Filter-APF resonance suppressing method and device - Google Patents
A kind of Active Power Filter-APF resonance suppressing method and device Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
本发明涉及一种有源电力滤波器谐振抑制方法及装置，属于电网谐波抑制技术领域。本发明根据设定的补偿参数对有源电力滤波器进行实施补偿；对补偿效果进行实时检测，若谐振放大超过设定值，则重新检测当前配电网中的谐振频率点，以新检测到的谐振频率点更新补偿参数，并以更新后的补偿参数对有源电力滤波器进行实施补偿。本发明通过检测补偿效果，根据谐振点的变化重新确定补偿参数，实时进行补偿带宽的改变，不需要人为设定，在保证有源电力滤波器补偿效果的同时，避免了谐振的发生。
The invention relates to a resonance suppression method and device for an active power filter, and belongs to the technical field of power grid harmonic suppression. The invention compensates the active power filter according to the set compensation parameters; detects the compensation effect in real time, and if the resonance amplification exceeds the set value, re-detects the resonance frequency point in the current distribution network to obtain a new The compensation parameters are updated at the resonant frequency point, and the active power filter is compensated with the updated compensation parameters. The invention re-determines the compensation parameters according to the change of the resonance point by detecting the compensation effect, changes the compensation bandwidth in real time, does not need artificial setting, and avoids the occurrence of resonance while ensuring the compensation effect of the active power filter.
Description
技术领域technical field
本发明涉及一种有源电力滤波器谐振抑制方法及装置，属于电网谐波抑制技术领域。The invention relates to a resonance suppression method and device for an active power filter, belonging to the technical field of power grid harmonic suppression.
背景技术Background technique
随着电网谐波问题的日益突出，有源电力滤波器已经成为抑制谐波的主要手段，然而配电网环境复杂，其中的无功补偿电容和线路电感构成振荡电路，而其振荡频率点无法预知。APF若控制不当，将引起LC振荡。谐振频率点具有不可预知性，其随着投入负载容量的变化而改变。APF的补偿电流中如果含有与线路谐振频率点相近的谐波电流成分，则将激励无功补偿电容和线路电感之间的振荡。且这种振荡是正反馈的，因为有源滤波模块检测到的谐波电流越大，其产生的补偿电流也越大，无功补偿电容和线路电感间的谐振也就越严重，这将严重影响配电网的安全稳定运行。With the increasingly prominent problem of harmonics in the power grid, active power filters have become the main means of suppressing harmonics. However, the distribution network environment is complex, and the reactive power compensation capacitor and line inductance constitute an oscillating circuit, and its oscillating frequency point cannot foreknowledge. If the APF is not properly controlled, it will cause LC oscillation. The resonant frequency point is unpredictable, and it changes with the input load capacity. If the compensation current of the APF contains harmonic current components close to the line resonance frequency point, it will stimulate the oscillation between the reactive power compensation capacitor and the line inductance. And this oscillation is positive feedback, because the greater the harmonic current detected by the active filter module, the greater the compensation current it generates, and the more serious the resonance between the reactive power compensation capacitor and the line inductance, which will seriously affect Safe and stable operation of distribution network.
配电网中各种非线性负载、无功补偿电容和电网线路电感构成复杂的高阶谐振点网络，谐振频率点具有不可预知性，其随着投入负载容量的变化而改变。APF的补偿电流中如果含有与线路谐振频率点相近的谐波电流成分，则将激励无功补偿电容和线路电感之间的振荡。且这种振荡是正反馈的，因为有源滤波模块检测到的谐波电流越大，其产生的补偿电流也越大，无功补偿电容和线路电感间的谐振也就越严重，这将严重影响配电网的安全稳定运行。Various nonlinear loads, reactive power compensation capacitors and grid line inductance in the distribution network constitute a complex network of high-order resonance points. The resonance frequency point is unpredictable and changes with the input load capacity. If the compensation current of the APF contains harmonic current components close to the line resonance frequency point, it will stimulate the oscillation between the reactive power compensation capacitor and the line inductance. And this oscillation is positive feedback, because the greater the harmonic current detected by the active filter module, the greater the compensation current it generates, and the more serious the resonance between the reactive power compensation capacitor and the line inductance, which will seriously affect Safe and stable operation of distribution network.
为了解决线路谐振问题，有两类避免谐振的方法：In order to solve the line resonance problem, there are two types of methods to avoid resonance:
1)改变原系统的固有谐振频率范围1) Change the natural resonance frequency range of the original system
通过改变系统的参数，可以使系统的谐振频率分布在一个比较合理的范围，从而避免串并联谐振的发生。By changing the parameters of the system, the resonance frequency of the system can be distributed in a reasonable range, thereby avoiding the occurrence of series and parallel resonance.
2)对并联有源电力波器进行改进2) Improve the parallel active power wave generator
变原来的全带宽补偿为有限带宽补偿，有选择谐波次数的补偿，不给需滤波系统提供谐振激励源。Change the original full-bandwidth compensation to limited-bandwidth compensation, with compensation for selecting harmonic orders, and not providing a resonance excitation source for the system that needs to be filtered.
目前，国内外大部分有源电力滤波器都已具备分次谐波补偿功能，可以通过设定改变补偿带宽从而抑制谐振的发生。然而，系统的谐振点往往会根据负载的变化而变化，因此采用传统的分次补偿功能会有以下缺点：需要根据补偿结果手动设定参数；系统谐振点发生变化时，不能实时改变补偿参数，增加了谐振的风险；补偿效果往往不理想。At present, most active power filters at home and abroad already have the function of sub-harmonic compensation, and the compensation bandwidth can be changed by setting to suppress the occurrence of resonance. However, the resonance point of the system often changes according to the change of the load, so the traditional multi-stage compensation function has the following disadvantages: the parameters need to be manually set according to the compensation result; when the system resonance point changes, the compensation parameters cannot be changed in real time, Increased risk of resonance; often less than ideal compensation.
发明内容Contents of the invention
本发明的目的是提供一种有源电力滤波器谐振抑制方法，以解决目前谐振点发生变化，不能实时改变补偿参数，导致谐振风险增加的问题。The purpose of the present invention is to provide a resonance suppression method for an active power filter to solve the current problem that the resonance point changes and the compensation parameters cannot be changed in real time, resulting in an increase in the risk of resonance.
本发明为解决上述技术问题而提供一种有源电力滤波器谐振抑制方法，该谐振抑制方法包括以下步骤：The present invention provides a method for suppressing resonance of an active power filter in order to solve the above-mentioned technical problems. The method for suppressing resonance includes the following steps:
1)根据设定的补偿参数对有源电力滤波器进行实施补偿；1) Compensate the active power filter according to the set compensation parameters;
2)对补偿效果进行实时检测，若谐振放大超过设定值，则重新检测当前配电网中的谐振频率点，以新检测到的谐振频率点更新补偿参数，并以更新后的补偿参数对有源电力滤波器进行实施补偿。2) Real-time detection of the compensation effect, if the resonance amplification exceeds the set value, re-detect the resonance frequency point in the current distribution network, update the compensation parameters with the newly detected resonance frequency point, and use the updated compensation parameters to Active power filter implements compensation.
本发明通过检测补偿效果，根据谐振点的变化重新确定补偿参数，实时进行补偿带宽的改变，不需要人为设定，在保证有源电力滤波器补偿效果的同时，避免了谐振的发生。The invention re-determines the compensation parameter according to the change of the resonance point by detecting the compensation effect, changes the compensation bandwidth in real time, does not need artificial setting, and avoids the occurrence of resonance while ensuring the compensation effect of the active power filter.
进一步地，所述步骤1)中设定的补偿参数是通过检测当前配电网中的谐振频率点，根据得到谐振频率点确定。本发明采用电网频率谐振点确定有源电力滤波器的补偿参数，避免了有源电力滤波器APF的补偿电流中含有与线路谐振频率点相近的谐波电流成分。Further, the compensation parameters set in step 1) are determined according to the obtained resonance frequency points by detecting the resonance frequency points in the current power distribution network. The invention adopts the grid frequency resonance point to determine the compensation parameters of the active power filter, avoiding that the compensation current of the active power filter APF contains harmonic current components close to the line resonance frequency point.
进一步地，所述步骤1)中用到的谐振频率点是采用扫频激励法对当前配电网中的各次谐波进行逐次激励得到。本发明采用扫频激励法检测电网谐振频率点，能够快速、准确的获取电网谐振频率点。Further, the resonant frequency point used in the step 1) is obtained by sequentially exciting each harmonic in the current power distribution network by using the frequency sweep excitation method. The invention adopts the sweep frequency excitation method to detect the resonant frequency point of the power grid, and can quickly and accurately acquire the resonant frequency point of the power grid.
进一步地，所述步骤2)是采用扫频激励法对当前配电网中的谐振频率点进行重新检测。Further, the step 2) is to re-detect the resonant frequency point in the current distribution network by using the frequency sweep excitation method.
本发明还提供了一种有源电力滤波器谐振抑制装置，该谐振抑制装置包括存储器和处理器以及存储在所述存储器上并在所述处理器上运行的计算机程序，所述处理器与所述存储器相耦合，所述处理器执行所述计算机程序时实现以下指令：The present invention also provides an active power filter resonance suppression device, the resonance suppression device includes a memory, a processor and a computer program stored in the memory and run on the processor, the processor and the The memory is coupled, and the processor implements the following instructions when executing the computer program:
1)根据设定的补偿参数对有源电力滤波器进行实施补偿；1) Compensate the active power filter according to the set compensation parameters;
2)对补偿效果进行实时检测，若谐振放大超过设定值，则重新检测当前配电网中的谐振频率点，以新检测到的谐振频率点更新补偿参数，并以更新后的补偿参数对有源电力滤波器进行实施补偿。2) Real-time detection of the compensation effect, if the resonance amplification exceeds the set value, re-detect the resonance frequency point in the current distribution network, update the compensation parameters with the newly detected resonance frequency point, and use the updated compensation parameters to Active power filter implements compensation.
进一步地，所述步骤1)中设定的补偿参数是通过检测当前配电网中的谐振频率点，根据得到谐振频率点确定。Further, the compensation parameters set in step 1) are determined according to the obtained resonance frequency points by detecting the resonance frequency points in the current power distribution network.
进一步地，所述步骤1)中用到的谐振频率点是采用扫频激励法对当前配电网中的各次谐波进行逐次激励得到。Further, the resonant frequency point used in the step 1) is obtained by sequentially exciting each harmonic in the current power distribution network by using the frequency sweep excitation method.
进一步地，所述步骤2)是采用扫频激励法对当前配电网中的谐振频率点进行重新检测。Further, the step 2) is to re-detect the resonant frequency point in the current distribution network by using the frequency sweep excitation method.
附图说明Description of drawings
图1是本发明有源滤波器谐振抑制方法的流程图；Fig. 1 is the flow chart of active filter resonance suppressing method of the present invention;
图2本发明所采用的扫频激励法的流程图；The flowchart of the frequency sweep excitation method that Fig. 2 the present invention adopts;
图3本发明所采用的扫频激励法的电路图。Fig. 3 is a circuit diagram of the sweep frequency excitation method adopted by the present invention.
具体实施方式Detailed ways
下面结合附图对本发明的具体实施方式做进一步的说明。The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
本发明一种有源滤波器谐振抑制方法的实施例Embodiment of an active filter resonance suppression method of the present invention
本发明的谐振抑制方法首先检测出当前配电网中的谐振频率点，根据得到谐振频率点设置分次补偿参数；然后根据设定的补偿参数对有源电力滤波器进行实施补偿；对补偿效果进行实时检测，若谐振放大超过设定值，则重新检测当前配电网中的谐振频率点，以新检测到的谐振频率点更新补偿参数，并以更新后的补偿参数对有源电力滤波器进行实施补偿。该方法的流程如图1所示，具体实施过程如下：The resonance suppression method of the present invention first detects the resonance frequency points in the current distribution network, and sets the graded compensation parameters according to the obtained resonance frequency points; then implements compensation to the active power filter according to the set compensation parameters; the compensation effect Carry out real-time detection, if the resonance amplification exceeds the set value, re-detect the resonance frequency point in the current distribution network, update the compensation parameters with the newly detected resonance frequency point, and use the updated compensation parameters for the active power filter Implement compensation. The process flow of this method is shown in Figure 1, and the specific implementation process is as follows:
1.检测出当前配电网中的谐振频率点，根据得到谐振频率点设置分次补偿参数。1. Detect the resonant frequency point in the current distribution network, and set the graded compensation parameters according to the obtained resonant frequency point.
本发明对于当前配电网中谐振频率点的检测采用扫频激励法，扫频激励法采用的扫频电路如图3所示，包括消弧线圈、扫频电流源和取样电阻R，工作原理如下：接于消弧线圈低压侧的扫频电流源发送一系列频率自动改变的正弦信号，对电网进行频率扫描，将取样电阻R上的电压和消弧线圈低压侧的电压进行相位比较，若某时刻两者的相位差为零，则将此刻扫频电流源电流的频率作为电网的谐振频率，以实现对电网谐振频率的计算。The present invention adopts the sweep frequency excitation method for the detection of the resonant frequency point in the current distribution network, and the sweep frequency circuit adopted by the sweep frequency excitation method is shown in Figure 3, including arc suppressing coil, sweep frequency current source and sampling resistor R, the working principle is as follows: the frequency sweeping current source connected to the low-voltage side of the arc suppression coil Send a series of sinusoidal signals whose frequency changes automatically, scan the frequency of the power grid, and sample the voltage on the resistor R and the voltage on the low-voltage side of the arc suppression coil Perform phase comparison. If the phase difference between the two is zero at a certain moment, the frequency of the sweeping current source current at this moment is taken as the resonant frequency of the power grid to realize the calculation of the resonant frequency of the power grid.
由于APF的补偿电流中如果含有与线路谐振频率点相近的谐波电流成分，则将激励无功补偿电容和线路电感之间的振荡，为此，本发明根据检测到的谐振点频率设置补偿参数，对谐振点频率不做补偿，避免了APF的补偿电流中含有与线路谐振频率点相近的谐波电流成分。Since the compensation current of the APF contains harmonic current components close to the line resonance frequency point, it will stimulate the oscillation between the reactive power compensation capacitor and the line inductance. Therefore, the present invention sets the compensation parameters according to the detected frequency of the resonance point , no compensation is made for the frequency of the resonance point, which avoids the harmonic current components close to the line resonance frequency point in the compensation current of the APF.
2.根据设定的补偿参数对有源电力滤波器实施补偿。2. Compensate the active power filter according to the set compensation parameters.
3.对补偿效果进行实时检测，若谐振放大超过设定值，则重新检测当前配电网中的谐振频率点，以新检测到的谐振频率点更新补偿参数。3. Real-time detection of the compensation effect. If the resonance amplification exceeds the set value, re-detect the current resonance frequency point in the distribution network, and update the compensation parameters with the newly detected resonance frequency point.
谐振频率点具有不可预知性，其随着投入负载容量的变化而改变，因此，需要通过改变系统的参数使系统的谐振频率分布在一个比较合理的范围，以避免串并联谐振的发生。为此，本发明对补偿效果进行实时检测，若发现谐振有放大现象，即谐振放大比例超过设定值，则重新检测当前配电网中的谐振频率点，以新检测到的谐振频率点更新补偿参数。The resonant frequency point is unpredictable, and it changes with the input load capacity. Therefore, it is necessary to change the system parameters to make the resonant frequency of the system distributed in a reasonable range to avoid the occurrence of series and parallel resonance. For this reason, the present invention detects the compensation effect in real time. If the resonance amplification phenomenon is found, that is, the resonance amplification ratio exceeds the set value, the current resonance frequency point in the distribution network is re-detected, and the newly detected resonance frequency point is updated. compensation parameters.
本发明有源电力滤波器谐振抑制装置的实施例Embodiment of the active power filter resonance suppressing device of the present invention
本发明的谐振抑制装置包括存储器和处理器以及存储在存储器上并在所述处理器上运行的计算机程序，处理器与存储器相耦合，处理器执行所述计算机程序时实现以下指令：1)根据设定的补偿参数对有源电力滤波器进行实施补偿；2)对补偿效果进行实时检测，若谐振放大超过设定值，则重新检测当前配电网中的谐振频率点，以新检测到的谐振频率点更新补偿参数，并以更新后的补偿参数对有源电力滤波器进行实施补偿。该装置的具体实现手段已在方法的实施例中进行了说明，这里不再赘述。The resonance suppression device of the present invention includes a memory, a processor and a computer program stored on the memory and operated on the processor, the processor is coupled to the memory, and the processor implements the following instructions when executing the computer program: 1) according to The set compensation parameters are implemented to compensate the active power filter; 2) Real-time detection of the compensation effect, if the resonance amplification exceeds the set value, re-detect the resonance frequency point in the current distribution network, and use the newly detected The compensation parameters are updated at the resonant frequency point, and the active power filter is compensated with the updated compensation parameters. The specific implementation means of the device has been described in the embodiment of the method, and will not be repeated here.
本发明有源电力滤波器运行后，先通过扫频激励法对各次谐波进行逐次激励，提取出当前电网的谐振点，然后自动设置分次补偿参数，对谐振点频率不做补偿。完成开机扫频激励后，即进入正常工作状态，根据已设定的补偿参数进行实时补偿，在补偿过程中采用自适应的抑制算法对补偿效果做实时监测，如在运行过程中，系统参数发生变化，发现谐振放大的现象，再运用扫频激励法重新整定参数，能够做到自适应调制补偿参数的目的，在保证避免谐振的前提下，最大程度的优化了补偿效果。After the active power filter of the present invention is in operation, the harmonics of each order are successively excited through the frequency sweep excitation method to extract the resonance point of the current power grid, and then automatically set the compensation parameters in stages without compensating the frequency of the resonance point. After the start-up frequency scanning excitation is completed, it will enter the normal working state and perform real-time compensation according to the set compensation parameters. During the compensation process, the self-adaptive suppression algorithm is used to monitor the compensation effect in real time. Changes, find the phenomenon of resonance amplification, and then use the frequency sweep excitation method to readjust the parameters, can achieve the purpose of adaptive modulation compensation parameters, and optimize the compensation effect to the greatest extent on the premise of avoiding resonance.
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| CN110007141A (en) * | 2019-04-26 | 2019-07-12 | 青岛鼎信通讯股份有限公司 | A Resonance Point Detection Method Based on Voltage and Current Harmonic Similarity |
| CN110007145A (en) * | 2019-04-26 | 2019-07-12 | 青岛鼎信通讯股份有限公司 | A Resonant Point Detection Method Based on Constant Voltage Source Converter and Voltage-Current Phase Difference |
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