CN114204583B - Device parameter design method for suppressing medium-frequency and high-frequency oscillations of flexible DC transmission - Google Patents
Device parameter design method for suppressing medium-frequency and high-frequency oscillations of flexible DC transmission Download PDFInfo
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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
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/36—Arrangements for transfer of electric power between AC networks via a high-tension DC link
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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
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/36—Arrangements for transfer of electric power between AC networks via a high-tension DC link
- H02J2003/365—Reducing harmonics or oscillations in HVDC
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
本发明提供了一种抑制柔性直流输电中频及高频振荡的多频点相位钳制无源阻抗装置参数设计方法。所述无源阻抗装置由电感、电容、电阻元件组成；所述多频点相位钳制原则是通过将选取的多个频率点处的相位重塑至±90°内来钳制整个特定频段柔性直流换流器的相位；所述多频点个数的选取不小于特定频段内换流器相位峰值出现的次数；所述电感、电容、电阻参数还需综合考虑系统的无功补偿容量和有功损耗；该设计方法所确定的无源阻抗装置能够有效抑制柔直系统中的中高频振荡现象。
The invention provides a parameter design method for a multi-frequency point phase clamp passive impedance device that suppresses intermediate frequency and high frequency oscillations of flexible DC transmission. The passive impedance device is composed of inductors, capacitors, and resistive elements; the multi-frequency phase clamping principle is to clamp the entire specific frequency band flexible DC converter by reshaping the phases at multiple selected frequency points to within ±90°. The phase of the converter; the selection of the number of multi-frequency points should not be less than the number of times the peak phase of the converter occurs in a specific frequency band; the inductance, capacitance, and resistance parameters also need to comprehensively consider the reactive power compensation capacity and active power loss of the system; The passive impedance device determined by this design method can effectively suppress the medium and high-frequency oscillation phenomenon in the flexible system.
Description
技术领域Technical field
本发明属于输配电技术领域，具体涉及一种抑制柔性直流输电中频及高频振荡的多频点相位钳制无源阻抗装置参数设计方法。The invention belongs to the technical field of power transmission and distribution, and specifically relates to a parameter design method for a multi-frequency phase clamped passive impedance device that suppresses intermediate frequency and high frequency oscillations of flexible DC transmission.
背景技术Background technique
随着柔性直流输电技术在工程中广泛的应用，随之而来系统也出现了一系列的稳定性问题。近年来工程中高频振荡现象频发，现有研究针对这一问题所提出的抑制策略主要从控制系统改进和外部附加无源装置这两方面进行。对于外部附加无源装置的抑制策略，需要对参数进行合理的设计才能达到有效抑制中高频的目的，因此有必要提出一种基于多频点相位钳制的无源阻抗装置参数设计方法，根据柔直系统的中高频阻抗特性来合理设计无源阻抗装置参数，使得柔性直流换流器交流侧的阻抗特性的得到较好改善，从而抑制中高频振荡。With the widespread application of flexible DC transmission technology in engineering, a series of stability problems have arisen in the system. In recent years, high-frequency oscillation phenomena have occurred frequently in engineering. Existing studies have proposed suppression strategies for this problem mainly from the two aspects of control system improvement and external additional passive devices. For the suppression strategy of external additional passive devices, reasonable design of parameters is required to achieve the purpose of effectively suppressing medium and high frequencies. Therefore, it is necessary to propose a parameter design method for passive impedance devices based on multi-frequency phase clamping. According to the flexible and direct The system's mid- and high-frequency impedance characteristics are used to rationally design the parameters of the passive impedance device, so that the impedance characteristics of the AC side of the flexible DC converter are better improved, thereby suppressing mid- and high-frequency oscillations.
本发明提出了一种抑制柔性直流输电中频及高频振荡的多频点相位钳制无源阻抗装置参数设计方法。根据给定的频段范围和柔性直流换流器的阻抗相位特性确定所选取的多频点个数；根据系统所允许的无功补偿约束确定电容参数；根根据选取的多频率点处相位约束初步确定电感和电阻的取值范围；根据系统的有功损耗约束进一步优化电感和电阻的取值范围。该设计方法所确定的无源阻抗装置能够有效抑制柔直系统中的中高频振荡现象。The present invention proposes a parameter design method for a multi-frequency point phase clamp passive impedance device that suppresses intermediate frequency and high frequency oscillations of flexible DC transmission. Determine the number of selected multi-frequency points according to the given frequency range and the impedance phase characteristics of the flexible DC converter; determine the capacitance parameters according to the reactive power compensation constraints allowed by the system; based on the preliminary phase constraints at the selected multi-frequency points Determine the value range of the inductor and resistor; further optimize the value range of the inductor and resistor according to the active loss constraints of the system. The passive impedance device determined by this design method can effectively suppress the medium and high-frequency oscillation phenomenon in the flexible system.
发明内容Contents of the invention
本发明的目的是提供一种抑制柔性直流输电中频及高频振荡的多频点相位钳制无源阻抗装置参数设计方法，其主要原理是从柔直换流器的阻抗特性出发，有效改善其中高频段的阻抗特性，从而抑制中高频振荡。The purpose of this invention is to provide a parameter design method for a multi-frequency point phase clamped passive impedance device that suppresses medium-frequency and high-frequency oscillations of flexible DC transmission. The main principle is to start from the impedance characteristics of the flexible DC converter and effectively improve the high-frequency The impedance characteristics of the frequency band, thereby suppressing mid- and high-frequency oscillations.
实现上述目的所采用的解决方案为：The solutions adopted to achieve the above goals are:
一种抑制柔性直流输电中频及高频振荡的多频点相位钳制无源阻抗装置参数设计方法，其特征在于，所述方法包括如下步骤：A parameter design method for a multi-frequency point phase clamped passive impedance device that suppresses medium-frequency and high-frequency oscillations of flexible DC transmission, characterized in that the method includes the following steps:
步骤1，根据给定的频段范围和柔性直流换流器的阻抗相位特性确定所选取的多频点个数；Step 1: Determine the number of selected multi-frequency points based on the given frequency range and the impedance phase characteristics of the flexible DC converter;
步骤2，根据系统所允许的无功补偿约束确定电容参数；Step 2: Determine the capacitance parameters according to the reactive power compensation constraints allowed by the system;
步骤3，根据选取的多频率点处相位约束初步确定电感和电阻的取值范围；Step 3: Preliminarily determine the value range of the inductance and resistance based on the phase constraints at the selected multi-frequency points;
步骤4，根据系统的有功损耗约束进一步优化电感和电阻的取值范围。Step 4: Further optimize the value range of the inductor and resistor according to the active power loss constraints of the system.
所述步骤1的过程具体为：The process of step 1 is specifically as follows:
选取的多频点个数不小于特定频段内换流器相位峰值出现的次数：The number of selected multi-frequency points must not be less than the number of times the converter phase peak occurs in a specific frequency band:
其中，fB、fA分别为给定的特定频率范围的上下限，fcmin为系统阻抗相位的最小变化频率周期，计算公式为fcmin＝1/Tdmax，其中Tdmax代表系统的最大延时时间。Among them, f B and f A are the upper and lower limits of a given specific frequency range respectively, f cmin is the minimum change frequency period of the system impedance phase, and the calculation formula is f cmin = 1/T dmax , where T dmax represents the maximum delay of the system. time time.
步骤2中，无源阻抗装置中的电容由柔性直流输电系统所允许的无功补偿容量来确定：In step 2, the capacitance in the passive impedance device is determined by the reactive power compensation capacity allowed by the flexible DC transmission system:
Qc＝U22πf1CQ c =U 2 2πf 1 C
其中，Qc为系统的无功补偿约束，U为交流母线电压，f1为基频，C为所求的电容。Among them, Q c is the reactive power compensation constraint of the system, U is the AC bus voltage, f 1 is the fundamental frequency, and C is the required capacitance.
步骤3中，由确定好的多频点个数N，在给定频段内取等间隔频率点，无源阻抗装置中的电感和电阻参数范围通过将等间隔频率点处系统阻抗相位修正至±90°来确定：In step 3, from the determined number N of multi-frequency points, equally spaced frequency points are taken in a given frequency band. The inductance and resistance parameter ranges in the passive impedance device are corrected by correcting the system impedance phase at the equally spaced frequency points to ± 90° to determine:
其中，L0为MMC的等值电感，R、L分别为无源阻抗装置中的电阻、电感，T为系统的延时时间，Arg代表求取阻抗相位运算。Among them, L 0 is the equivalent inductance of MMC, R and L are the resistance and inductance in the passive impedance device respectively, T is the delay time of the system, and Arg represents the calculation of the impedance phase.
在步骤4中，根据系统的有功损耗约束进一步优化电感和电阻的取值范围：In step 4, further optimize the value range of the inductor and resistor according to the active power loss constraints of the system:
其中，P为系统允许的有功损耗。Among them, P is the allowable active power loss of the system.
本发明提供的一种抑制柔性直流输电中频及高频振荡的多频点相位钳制无源阻抗装置参数设计方法，能够有效改善柔性直流换流器中高频段的阻抗特性，从而有效抑制系统中的中高频振荡。The invention provides a parameter design method for a multi-frequency phase clamped passive impedance device that suppresses intermediate frequency and high-frequency oscillations of flexible DC transmission, which can effectively improve the impedance characteristics of the flexible DC converter in the mid- and high-frequency bands, thereby effectively suppressing the impedance in the system. Medium to high frequency oscillation.
附图说明Description of drawings
图1为本发明提供的电阻和电感参数取值范围图。Figure 1 is a diagram showing the value ranges of resistance and inductance parameters provided by the present invention.
图2为本发明提供的选取所确定的参数前后MMC阻抗对比图。Figure 2 is a comparison diagram of MMC impedance before and after selecting the determined parameters provided by the present invention.
具体实施方式Detailed ways
本发明提供了一种抑制柔性直流输电中频及高频振荡的多频点相位钳制无源阻抗装置参数设计方法，首先根据给定的特定中高频段和柔直换流器阻抗特性选取多频点个数；然后根据系统所允许的无功补偿约束确定电容参数；接着根据选取的多频率点处相位约束初步确定电感和电阻的取值范围；最后根据系统的有功损耗约束进一步优化电感和电阻的取值范围。The present invention provides a parameter design method for a multi-frequency phase clamped passive impedance device that suppresses medium-frequency and high-frequency oscillations of flexible DC transmission. First, multiple frequency points are selected based on a given specific medium-high frequency band and the impedance characteristics of the flexible DC converter. number; then determine the capacitance parameters according to the reactive power compensation constraints allowed by the system; then initially determine the value range of the inductance and resistance according to the phase constraints at the selected multi-frequency points; finally, further optimize the inductance and resistance according to the active power loss constraints of the system. Ranges.
下面以额定功率为1250MW，交流电压为525kV、系统延时时间为500μs的MMC系统为例，对基于多频点相位钳制的无源阻抗装置参数设计方法进行设计验证。本算例中给定特定频段为500Hz-2500Hz，相位优化目标为将MMC交流侧阻抗相位重塑至±90°之间，并留有20°的相位裕度。根据5％有功功率的无功补偿约束，得出电容参数为0.72F；根据给定的特定频段可计算出多频点个数N≥2，取N＝3，所对应的等间隔频率点为1000Hz、1500Hz、2000Hz；根据多频率点处相位约束及低于1％的有功损耗约束确定电感和电阻的取值范围。图1给出了符合条件的电阻和电感的取值范围。在满足条件的取值范围中取选择A1(15,380)、A2(30,320)、A3(36,252)、A4(42,160)四个点所对应的参数来进行阻抗验证。Taking an MMC system with a rated power of 1250MW, an AC voltage of 525kV, and a system delay time of 500μs as an example, the parameter design method of passive impedance device based on multi-frequency phase clamping is designed and verified. In this example, the specific frequency band is 500Hz-2500Hz, and the phase optimization goal is to reshape the MMC AC side impedance phase to ±90°, leaving a 20° phase margin. According to the reactive power compensation constraint of 5% active power, the capacitance parameter is 0.72F; according to the given specific frequency band, the number of multi-frequency points can be calculated N≥2, taking N=3, the corresponding equally spaced frequency points are 1000Hz, 1500Hz, 2000Hz; determine the value range of inductance and resistance based on phase constraints at multiple frequency points and active loss constraints below 1%. Figure 1 shows the qualified resistor and inductor value ranges. Select the parameters corresponding to four points A 1 (15,380), A 2 (30,320), A 3 (36,252), and A 4 (42,160) from the value range that meets the conditions for impedance verification.
图2给出了本算例的阻抗验证结果，与原始的系统阻抗相位相比，采用所选取的四组参数均能使系统阻抗相位在特定频段内保持在±90°以内。说明本发明提供的基于多频点相位钳制的无源阻抗装置参数设计方法可以很好地改善系统的中高频段阻抗，有效降低柔性直流输电系统的中高频振荡的潜在风险。Figure 2 shows the impedance verification results of this example. Compared with the original system impedance phase, the four selected sets of parameters can keep the system impedance phase within ±90° in a specific frequency band. It shows that the passive impedance device parameter design method based on multi-frequency phase clamping provided by the present invention can well improve the system's mid- and high-frequency band impedance, and effectively reduce the potential risk of mid- and high-frequency oscillation of the flexible DC transmission system.
上述实施例仅用以说明本发明而并非限制本发明所描述的技术方案；因此，尽管本说明书参照上述的各个实施例对本发明已进行了详细的说明，但是，本领域的普通技术人员应当理解，仍然可以对本发明进行修改或者等同替换；而一切不脱离本发明的精神和范围的技术方案及其改进，其均应涵盖在本发明的权利要求范围当中。The above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention; therefore, although the present invention has been described in detail with reference to each of the above embodiments, those of ordinary skill in the art should understand that , the present invention can still be modified or equivalently substituted; and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered by the claims of the present invention.
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