Harmonic suppression method and system of rail transit electric traction system

Abstract

The invention discloses a harmonic suppression method and system of a rail transit electric traction system. The system comprises a traction unit harmonic response acquisition module, a traction group construction and intra-group influence analysis module, a traction group collaborative behavior analysis module, a collaborative suppression strategy generation module and a suppression resource regulation and control module. The method comprises the following steps: dividing a plurality of traction units on the same train into traction groups, analyzing harmonic response information of the traction units on a traction group level to generate comprehensive harmonic influence characteristics, analyzing action results of the plurality of traction groups on a traction power supply section level, and judging whether a harmonic collaborative amplification or collaborative instability trend exists or not; and thus, a collaborative harmonic suppression strategy for the traction group or the traction unit is generated. Through differential regulation and control on harmonic suppression resources and in combination with feedback correction, dynamic adjustment of a harmonic suppression process is realized, and pertinence of harmonic suppression under a complex operation condition and operation stability of a traction power supply system are improved.

Description

Technical Field

[0001] This invention relates to the field of electric traction systems for rail transit, and particularly to a method and system for harmonic suppression in electric traction systems for rail transit. Background Technology

[0002] With the continuous expansion of the scale and increasing operational density of rail transit systems, the application of electric traction systems in rail transit is becoming increasingly widespread. In the rail transit traction power supply system, the traction power supply network supplies electrical energy to the trains through traction substations, and each train converts the electrical energy into the traction power required to drive the train through the traction unit.

[0003] During train operation, the traction unit typically uses power electronic devices for power conversion, and its operation inevitably generates harmonic components, thus affecting the power quality in the traction power supply network. To reduce the impact of harmonics on the traction power supply system and related equipment, existing technologies usually suppress the harmonics generated by the traction unit by installing filtering devices or harmonic suppression devices in the traction power supply system.

[0004] Existing harmonic suppression technologies mostly focus on a single traction unit or a single train as the primary object of analysis and control. They typically reduce harmonic levels in the traction power supply system by detecting the harmonic content in local current or voltage signals and controlling the harmonic suppression device based on the detection results. These technologies can improve the power quality of the traction power supply system to some extent.

[0005] However, in actual rail transit operation, multiple trains often operate simultaneously within the same traction power supply section, and the operating conditions of each train may change over time. Due to the complex operating environment within the traction power supply section, harmonic detection and suppression methods at the level of a single traction unit or a single train are insufficient to comprehensively reflect the overall operating status of the traction power supply system at the section level. Furthermore, existing harmonic suppression strategies mostly employ preset parameters or static control methods, lacking the dynamic adaptability to changes in the operating status of the traction power supply system. When operating conditions change within the traction power supply section, fixed harmonic suppression strategies may exhibit response lag or unsatisfactory control effects, thereby affecting the stable operation of the traction power supply system.

[0006] Therefore, existing technologies still have problems such as insufficient adaptability to complex operating scenarios and limited control flexibility when dealing with harmonic problems in rail transit traction power supply systems. There is an urgent need for a harmonic suppression technology that can adapt to changes in actual operating conditions. Summary of the Invention

[0007] The purpose of this invention is to provide a harmonic suppression system for a rail transit electric traction system, which has the advantages of improving the effectiveness of harmonic suppression and the stability of the traction power supply system operation.

[0008] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A harmonic suppression system for a rail transit electric traction system includes: The traction unit harmonic response acquisition module is used to acquire harmonic response information of multiple traction units on each train in the same traction power supply section under the corresponding train operating conditions during the operation of rail transit. The harmonic response information includes at least the harmonic characteristic parameters in the output current or voltage of the traction unit. The traction group construction and intra-group influence analysis module is used to divide multiple traction units on the same train into a traction group, and based on the harmonic response information of each traction unit in the traction group, analyze the mutual influence relationship between the traction units in the traction group, and generate a comprehensive harmonic influence feature characterizing the overall harmonic behavior of the traction group. The traction group cooperative behavior analysis module is used to analyze the mutual influence of different traction groups under different operating conditions within the same traction power supply section based on the comprehensive harmonic influence characteristics of multiple traction groups, determine whether there is a harmonic cooperative amplification or cooperative instability trend formed by the joint action of multiple traction groups, and output inter-group cooperative behavior characteristics that characterize the cooperative behavior state between the traction groups. The collaborative suppression strategy generation module is used to generate a collaborative harmonic suppression strategy for the traction group or traction unit based on the inter-group collaborative behavior characteristics when it is determined that there is a collaborative amplification or collaborative instability trend of the harmonics. The suppression resource regulation module is used to perform regulation operations on preset harmonic suppression resources according to the cooperative harmonic suppression strategy.

[0009] By adopting the above technical solutions and constructing a system architecture that includes traction unit harmonic response acquisition, traction group construction and intra-group impact analysis, traction group collaborative behavior analysis, collaborative suppression strategy generation, and suppression resource regulation, the harmonic suppression process is upgraded from the traditional single harmonic source suppression method to a systematic collaborative suppression method oriented towards the traction power supply section level, thereby improving the overall adaptability of the rail transit electric traction system to complex operating scenarios.

[0010] Further configuration: The step of analyzing the mutual influence relationship between traction units within the traction group based on the harmonic response information of each traction unit within the traction group, and generating comprehensive harmonic influence characteristics characterizing the overall harmonic behavior of the traction group, specifically includes: Based on the harmonic response information of multiple traction units within the same traction group under the same train operation command and power supply conditions, and combined with the electrical correlation of the traction units within the traction group in the traction power supply network, the degree of influence of the harmonic response of each traction unit on the overall harmonic behavior of the traction group is decomposed and analyzed. The effect results of each traction unit are equivalently aggregated at the traction group level, thereby forming the equivalent comprehensive harmonic influence characteristics of the traction group in the traction power supply section.

[0011] By adopting the above technical solution, the harmonic response information of multiple traction units in the same train is analyzed within the traction group level, and the harmonic effect results of the traction units are equivalently aggregated. This avoids the information fragmentation problem caused by isolated analysis of a single traction unit, enabling the traction group to participate in subsequent harmonic behavior determination as an independent analysis object, thereby improving the stability and representativeness of the harmonic analysis results.

[0012] Further configuration: The comprehensive harmonic influence characteristics are a set of structured features at the traction group level, which includes at least: The influence component of each traction unit within the traction group on the distribution of the overall harmonic behavior of the traction group; The correlation component characterizes the superposition relationship of harmonic effects between the traction units; The structured feature set is used to describe the overall harmonic impact state of the traction group within the traction power supply section at the traction group level.

[0013] By adopting the above technical solution, the comprehensive harmonic influence characteristics of the traction group are constructed into a structured feature set containing influence components and related components. This enables the overall harmonic behavior of the traction group to be described in a clear data structure form, providing a clear and unified analytical basis for subsequent analysis of the coordinated behavior between traction groups. This is beneficial to improving the system's adaptability to different operating states.

[0014] Further configuration: The influence components include a positive influence component characterizing the enhancing effect of the traction group on the overall harmonic level of the traction power supply section, and a negative influence component characterizing the weakening or canceling effect of the traction group on the overall harmonic level of the traction power supply section.

[0015] By adopting the above technical solution, and by distinguishing between positive and negative influence components, the system can identify the different directions of influence of the traction group on the overall harmonic level of the traction power supply section. This provides a clear basis for subsequent determination of whether harmonic behavior needs to be suppressed, thereby avoiding unnecessary suppression operations when the harmonic effect is already in a favorable state.

[0016] Further configuration: When generating the inter-group collaborative behavior characteristics, the traction group collaborative behavior analysis module... Taking the comprehensive harmonic influence characteristics of multiple traction groups within the same traction power supply section as the analysis object, the influence direction of the interaction results of the comprehensive harmonic influence characteristics of different traction groups on the overall harmonic level of the traction power supply section during the time evolution process is analyzed. When the interaction of the combined harmonic influence characteristics of multiple traction groups reduces or stabilizes the overall harmonic level of the traction power supply section, the interaction is judged as benign synergy and is not treated as a harmonic suppression target. When it is determined that the interaction of the combined harmonic influence characteristics of multiple traction groups causes the overall harmonic level of the traction power supply section to increase, the change of the overall harmonic level over time is further analyzed. If the overall harmonic level shows a continuously increasing trend, it is determined that there is a synergistic amplification trend; If the overall harmonic level exhibits unstable evolution characteristics, it is determined that there is a trend of coordinated instability. Based on the above determination results, inter-group synergistic behavior characteristics are formed to characterize the synergistic amplification trend or synergistic instability trend.

[0017] By adopting the above technical solution, the system can accurately identify the development direction of harmonic behavior at the overall section level by analyzing the comprehensive harmonic influence characteristics of multiple traction groups at the traction power supply section level, and distinguishing between benign coordination, harmonic coordination amplification trend and harmonic coordination instability trend. This avoids making suppression decisions based solely on local information and improves the accuracy and reliability of harmonic suppression judgment.

[0018] Further configuration: The step of generating a cooperative harmonic suppression strategy for the traction group or traction unit based on the inter-group cooperative behavior characteristics specifically includes the following steps: When the traction group cooperative behavior analysis module determines that there is a trend of harmonic cooperative amplification or cooperative instability, based on the influence of different traction groups on the overall harmonic level of the traction power supply section reflected in the inter-group cooperative behavior characteristics, the range of traction groups participating in cooperative harmonic suppression and the degree of suppression participation of each traction group are determined. Furthermore, based on the type of synergistic amplification trend or synergistic instability trend, a synergistic harmonic suppression strategy is generated to weaken the superposition effect of harmonics between traction groups or to suppress the evolution behavior of unstable harmonics. The collaborative harmonic suppression strategy is used to differentiate the control methods and intensity of harmonic suppression resources at the traction group level or traction unit level.

[0019] By adopting the above technical solution, when it is determined that there is a trend of harmonic amplification or instability, a coordinated harmonic suppression strategy is generated based on the degree of influence of different traction groups on the overall harmonic level of the section. This allows harmonic suppression resources to participate as needed and be configured in a differentiated manner, avoiding the implementation of uniform intensity suppression for all traction groups, thereby improving the utilization efficiency of harmonic suppression resources.

[0020] Further configuration: When the traction group cooperative behavior analysis module determines that the cooperation is benign, the cooperative harmonic suppression strategy is configured to limit or reduce the participation of harmonic suppression resources, or maintain the current configuration state of harmonic suppression resources.

[0021] By adopting the above technical solution, when the cooperative harmonic suppression strategy is determined to be benign, the system can retain the beneficial harmonic interaction relationship formed between traction groups, avoid excessive suppression from adversely affecting the stability of the traction power supply system, and help maintain the natural balance of harmonic behavior within the traction power supply section.

[0022] Further configuration: The suppression resource regulation module is configured to perform control and adjustment on the harmonic suppression resources corresponding to the traction group or traction unit participating in the collaborative harmonic suppression based on the collaborative harmonic suppression strategy. The control and adjustment includes adjusting at least the control parameters of the harmonic suppression resources. The control parameters are used to limit at least one of the response amplitude, response speed, or participation priority of the harmonic suppression resources, so that different traction groups or traction units exhibit differentiated control response characteristics in the collaborative harmonic suppression process.

[0023] By adopting the above technical solution, the collaborative harmonic suppression strategy is transformed into the regulation and control of harmonic suppression resource parameters, enabling the harmonic suppression process to be implemented as a specific and executable control behavior, thereby ensuring the operability and reliability of the harmonic suppression strategy at the engineering implementation level.

[0024] Further configuration: After executing the coordinated harmonic suppression strategy, the suppression resource control module is configured to adjust the control parameters of the harmonic suppression resources based on the changes in the overall harmonic level of the traction power supply section. Specifically, when the overall harmonic level shows a decreasing or stable trend, the control intensity of the harmonic suppression resources is reduced or some harmonic suppression resources are withdrawn from participation; when the overall harmonic level still shows an increasing or unstable trend, the control intensity of the harmonic suppression resources is increased or the control parameter configuration of the harmonic suppression resources is adjusted.

[0025] By adopting the above technical solution and introducing a feedback correction mechanism based on the overall harmonic level change of the traction power supply section, the harmonic suppression process can be dynamically adjusted according to the changes in operating status, forming a closed-loop control, thereby improving the sustainability of the harmonic suppression effect and the system's adaptability under complex operating conditions.

[0026] Another objective of this invention is to provide a harmonic suppression method for a rail transit electric traction system.

[0027] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A harmonic suppression method for a rail transit electric traction system specifically includes the following steps: During the operation of rail transit, the harmonic response information of multiple traction units on each train in the same traction power supply section is obtained under the corresponding train operating conditions. The harmonic response information includes at least the harmonic characteristic parameters in the output current or voltage of the traction unit. Multiple traction units on the same train are divided into a traction group, and based on the harmonic response information of each traction unit in the traction group, the mutual influence relationship between the traction units in the traction group is analyzed to generate a comprehensive harmonic influence feature characterizing the overall harmonic behavior of the traction group. Within the same traction power supply section, based on the comprehensive harmonic influence characteristics of multiple traction groups, the mutual influence of different traction groups under different operating conditions is analyzed to determine whether there is a trend of harmonic synergistic amplification or synergistic instability caused by the joint action of multiple traction groups, and inter-group synergistic behavior characteristics characterizing the synergistic behavior state between traction groups are generated. When it is determined that there is a trend of harmonic synergistic amplification or synergistic instability, a synergistic harmonic suppression strategy for the traction group or traction unit is generated based on the inter-group synergistic behavior characteristics. According to the aforementioned synergistic harmonic suppression strategy, the preset harmonic suppression resources are controlled to suppress the synergistic amplification or instability trend of harmonics caused by the synergistic effect of multiple traction groups.

[0028] In summary, the present invention has the following beneficial effects: By modeling the harmonic behavior of traction units at the traction group level and analyzing the effects of multiple traction groups at the traction power supply section level, the system can judge the development trend of harmonic behavior from an overall perspective, avoiding making suppression decisions based solely on local detection results, thereby improving the accuracy and stability of harmonic suppression judgment.

[0029] Meanwhile, by distinguishing between benign coordination and harmonic coordination amplification or coordination instability, the system can avoid unnecessary suppression intervention when harmonic behavior is in a favorable state, and implement targeted coordinated harmonic suppression when harmonic behavior deteriorates, thereby improving the operational stability of the traction power supply system under complex operating conditions.

[0030] Furthermore, by differentiating the configuration of harmonic suppression resources and introducing a feedback adjustment mechanism, the present invention enables the harmonic suppression process to be dynamically adjusted according to changes in the operating status of the traction power supply section. While ensuring the harmonic suppression effect, it also improves the utilization efficiency of the suppression resources and has good engineering applicability. Attached Figure Description

[0031] Figure 1 This is a structural block diagram of the harmonic suppression system of the rail transit electric traction system in the embodiment; Figure 2 This is a flowchart illustrating the harmonic suppression method for the electric traction system of rail transit in this embodiment. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the accompanying drawings.

[0033] Example: A harmonic suppression system for a rail transit electric traction system, such as Figure 1 As shown, the harmonic suppression system of the rail transit electric traction system is applied in rail transit traction power supply scenarios, specifically in situations where multiple trains operate simultaneously within the same traction power supply section. The traction power supply section can be a power supply section from a traction substation to a certain range of overhead contact lines or power supply lines. Within this traction power supply section, one or more rail transit trains may be operating simultaneously.

[0034] In actual operation, multiple rail transit trains within the same traction power supply section may run in the same direction or in opposite directions, and the operating speed, traction conditions, and braking status of each train may differ. For example, while one train is in a traction acceleration state, another train may be in a constant speed running state or a regenerative braking state, or even trains may be running in opposite directions at the same time.

[0035] Each rail transit train is equipped with multiple traction units, which are used to convert the electrical energy provided by the traction power supply network into the traction power or regenerative power required to drive the train. Due to the different running directions, operating conditions, and traction control states of different trains, the harmonic responses generated by each traction unit in the traction power supply network may have significant differences in amplitude, phase, and variation trends, resulting in more complex interaction characteristics of harmonic behavior in the traction power supply network.

[0036] In the aforementioned application scenarios, when multiple trains exist within the same traction power supply section and their operating directions are inconsistent, the harmonic responses generated by multiple traction units on different trains in the traction power supply network may not only superimpose but also cancel or amplify each other due to differences in operating direction and energy flow, thus having a complex impact on the overall harmonic level within the traction power supply section. Existing technologies typically use a single traction unit or a single train as the analysis object, making it difficult to accurately reflect the harmonic behavior characteristics under the combined effects of multiple trains, different operating directions, and multiple traction units.

[0037] Based on the above, this embodiment provides a harmonic suppression system for a rail transit electric traction system. The system comprises a traction unit harmonic response acquisition module, a traction group construction and intra-group impact analysis module, a traction group cooperative behavior analysis module, a cooperative suppression strategy generation module, and a suppression resource regulation module. These modules work collaboratively to analyze the harmonic behavior resulting from the combined effects of multiple traction units, multiple trains, and different operating directions at the traction power supply section level, and based on this analysis, to rationally regulate harmonic suppression resources.

[0038] In this embodiment, the traction unit harmonic response acquisition module is used to collect harmonic response information from multiple traction units on various trains within the same traction power supply section during rail transit operation. The harmonic response information reflects the electrical interaction characteristics between the traction unit and the traction power supply network under the corresponding train operating conditions.

[0039] Specifically, during train operation, the traction unit operates under different conditions such as traction acceleration, constant speed operation, braking, or regenerative braking, according to the train operation command. Under these operating conditions, the traction unit harmonic response acquisition module acquires electrical parameters set at the output side or traction power supply interface of each traction unit, thereby forming the harmonic response information of the corresponding traction unit under the current operating condition.

[0040] In this embodiment, the harmonic response information includes at least harmonic characteristic parameters in the output current or voltage of the traction unit. These harmonic characteristic parameters can be used to characterize the non-fundamental components introduced by the traction unit into the traction power supply network, and can take the form of a set of parameters reflecting the harmonic amplitude distribution, variation trend, or other characteristics that can characterize harmonic behavior.

[0041] To ensure that the collected harmonic response information accurately reflects the operating status of the traction unit during actual operation, the traction unit harmonic response acquisition module simultaneously records the operating condition information of the train to which the traction unit belongs, thus establishing a correlation between the collected harmonic response information and the train's operating conditions. This method allows for the differentiation of the traction unit's harmonic response under different operating conditions, providing fundamental data support for subsequent analysis.

[0042] Within the same traction power supply section, since multiple trains may exist simultaneously with different operating directions and conditions, the traction unit harmonic response acquisition module collects harmonic response information from the traction units of each train. This generates a harmonic response data set at the traction power supply section level, encompassing multiple traction units and various operating conditions. This harmonic response data set is used for subsequent analysis and processing of harmonic behavior at the traction group level and the traction power supply section level.

[0043] In this embodiment, the traction group construction and intra-group influence analysis module is used to group and organize the traction units after the harmonic response acquisition of the traction units is completed, and to analyze the mutual influence relationship between the traction units at the traction group level after grouping.

[0044] Specifically, multiple traction units installed on the same train typically receive the same train operation commands and operate under the same traction power supply conditions during train operation. Their operating status is subject to unified scheduling based on the overall train operation conditions. Therefore, compared to treating traction units as completely independent analysis objects, dividing multiple traction units on the same train into a traction group is more conducive to reflecting the overall harmonic impact of the train hierarchy on the traction power supply network.

[0045] Based on the above considerations, in this embodiment, multiple traction units on the same train are divided into a traction group. The traction group serves as the basic analysis unit for subsequent harmonic analysis and judgment, used to describe the overall harmonic behavior of the train on the traction power supply network at the traction power supply section level.

[0046] After the traction group is constructed, the traction group construction and intra-group influence analysis module analyzes the mutual influence relationship between traction units within the traction group based on the harmonic response information collected by each traction unit within the same traction group under the same train operation command and traction power supply conditions.

[0047] In this embodiment, the intra-group influence analysis is not simply a superposition of the harmonic responses of each traction unit, but rather a decomposition analysis of the degree of influence of the harmonic responses of each traction unit on the overall harmonic behavior of the traction group, taking into account the electrical relationships between the traction units within the traction power supply network. These electrical relationships can reflect the connection method of the traction units in the traction power supply network, energy interaction paths, or other factors affecting harmonic transmission characteristics.

[0048] After decomposing and analyzing the impact of each traction unit, the traction group construction and intra-group impact analysis module performs equivalent aggregation of the impact results of each traction unit at the traction group level, thereby forming an equivalent comprehensive harmonic impact characteristic that characterizes the overall harmonic behavior of the traction group within the traction power supply section. This equivalent comprehensive harmonic impact characteristic reflects the harmonic impact state of the traction group as a whole on the traction power supply network and serves as the input basis for subsequent traction group cooperative behavior analysis.

[0049] It should be noted that the traction group construction and intra-group influence analysis process described in this embodiment focuses on the interaction relationship between traction units within the traction group and its impact on the overall harmonic behavior of the traction group, and does not involve the interaction analysis between different traction groups.

[0050] The following is an example of the calculation process for the mutual influence analysis and comprehensive harmonic influence characteristics within the traction group: In this embodiment, for the same traction group g (corresponding to the same train), let the traction group contain M traction units, denoted as , ,…, Under the same train operation command and traction power supply conditions, the harmonic characteristic parameters of the output current or voltage of each traction unit are collected, and the harmonic response information of the traction unit is formed.

[0051] Harmonic order set For example (selecting several key orders or several frequency bands), for the traction unit The harmonic amplitude within the time window t is characterized, and its harmonic eigenvector is constructed: ; in, Indicates traction unit The amplitude of the corresponding harmonic order h within the time window t (which can be obtained from the acquisition module or calculated from the acquired data as a harmonic characteristic parameter).

[0052] To facilitate comparison between different traction units, the harmonic characteristic vectors can be normalized at the traction group level, for example: ; in To prevent tiny positive numbers with a denominator of zero.

[0053] In this embodiment, the electrical relationships between traction units within the traction group and in the traction power supply network are represented by an association matrix. Characterization, where: Indicates traction unit The harmonic response of the traction unit The intensity of the influence (can be obtained from the connection topology, power supply branch impedance characteristics, or engineering settings); This indicates that self-influence terms are not considered.

[0054] Based on W, construct a traction unit. The "intra-group coupled harmonic response" (reflecting the equivalent response after mutual influence): ; The first term is the harmonic response of the traction unit itself, and the second term is the coupling influence term from other traction units in the group, thereby realizing the decomposition and quantification of the "mutual influence relationship between traction units".

[0055] Furthermore, to characterize the "distribution of degree of effect", a traction unit can be defined. The scalar magnitude of the effect intensity (contribution to the effect) within the time window t: ; This yields the distribution vector of the degree of action of each traction unit within the traction group: ; To characterize the effect of the traction unit on the overall harmonic level of the traction power supply section, this embodiment uses the equivalent influence intensity of the traction unit level as the basic quantity and defines the equivalent influence amplitude of the traction unit in time window t: ; in, This is the weighting coefficient for the traction unit, used to reflect the relative weight of the traction unit within the traction group (it can be set with equal weights or based on engineering experience).

[0056] To incorporate both "enhancing effect" and "weakening / counteracting effect" into the same expression, this embodiment introduces an action direction coefficient. To characterize the direction of the traction group's effect on the overall harmonic level, where: Indicates a strengthening effect; It indicates a weakening or offsetting effect.

[0057] The "direction influence" of the traction group can then be expressed as: ; Therefore, the influence components can be divided into positive influence components and negative influence components (distinguished only within the influence components themselves): ; in Characterizing the positive influence component, Characterizes the reverse influence component.

[0058] To characterize the superposition relationship between the harmonic effects of the traction units within the traction group, this embodiment uses the similarity between the equivalent response vectors of the traction units to describe the degree of correlation, defining the correlation components of the traction group within the time window t: ; in The normalized average correlation is used to characterize the superposition / consistency relationship of harmonic effects within the traction group; this correlation component does not characterize the direction of action.

[0059] In summary, in this embodiment, the comprehensive harmonic influence characteristics of the traction group can be constructed into a structured feature set, for example, as follows: ; in, Basic information on the influence components characterizing the distribution of the degree of influence. and These are the positive and negative influence components, respectively. For associated components.

[0060] Through the above calculation process, based on the harmonic response information of each traction unit in the traction group and the electrical relationship between the traction units in the traction power supply network, the decomposition analysis of the mutual influence relationship in the traction group can be completed, and equivalent aggregation can be performed at the traction group level. Finally, a comprehensive harmonic influence characteristic representing the overall harmonic behavior of the traction group is generated, thereby meeting the input requirements for subsequent traction group collaborative behavior analysis.

[0061] After completing the traction group construction and intra-group influence analysis, this embodiment further constructs the generated equivalent comprehensive harmonic influence characteristics in a structured manner to form a feature expression form suitable for analysis at the traction power supply section level.

[0062] In this embodiment, the comprehensive harmonic influence feature is a structured feature set at the traction group level, used to describe the influence of the traction group on the overall harmonic behavior within the traction power supply section. The structured feature set includes at least two types of feature content: influence components and associated components.

[0063] The influence components are used to characterize the direction and extent of the effect of the traction unit on the overall harmonic level of the traction power supply section. In this embodiment, the influence components are further divided into positive influence components and negative influence components: the positive influence components characterize the effect of the traction unit on enhancing the overall harmonic level of the traction power supply section; the negative influence components characterize the effect of the traction unit on weakening or canceling the overall harmonic level of the traction power supply section.

[0064] By distinguishing between the positive and negative influence components, the comprehensive effect of the traction group on the overall harmonic level of the traction power supply section under the current operating state can be reflected at the traction group level, providing a basis for subsequent analysis.

[0065] The correlation components are used to characterize the superposition relationship and interrelation characteristics between the harmonic effects of each traction unit within the traction group. These correlation components are not used to describe the direction of the traction group's effect on the overall harmonic level of the traction power supply section, but rather to describe the degree of correlation of the harmonic effects within the traction group in space, time, or operating state, thereby reflecting the consistency or dispersion characteristics of the harmonic behavior within the traction group.

[0066] In this embodiment, by combining the influencing components and the associated components to form the comprehensive harmonic influence feature, it is possible to simultaneously describe the effect of the traction group on the overall harmonic level of the traction power supply section and the structural characteristics of the harmonic behavior within the traction group at the traction group level. The comprehensive harmonic influence feature serves as a unified feature input for subsequent analysis of the interaction relationships between multiple traction groups at the traction power supply section level.

[0067] In this embodiment, after obtaining the comprehensive harmonic influence characteristics of each traction group within the same traction power supply section, the interaction relationship of multiple traction groups is further analyzed at the traction power supply section level to identify whether there is cooperative behavior and corresponding cooperative trend among the traction groups.

[0068] Specifically, the traction group cooperative behavior analysis module takes the comprehensive harmonic influence characteristics of multiple traction groups within the same traction power supply section as the analysis object, and analyzes the interaction results between the comprehensive harmonic influence characteristics of different traction groups in combination with the operating status of each traction group in the corresponding time period.

[0069] In this embodiment, the interaction result is used to characterize the combined impact of multiple traction groups acting together in the traction power supply network on the overall harmonic level of the traction power supply section. The overall harmonic level reflects the change of harmonics within the traction power supply section over time and serves as a basic reference quantity for determining cooperative behavior.

[0070] In the analysis of the coordinated behavior of traction groups, the first step is to determine the direction of the influence of the interaction of the combined harmonic influence characteristics of multiple traction groups on the overall harmonic level of the traction power supply section. When the interaction of the combined harmonic influence characteristics of multiple traction groups reduces or stabilizes the overall harmonic level of the traction power supply section, it indicates that the harmonic effects between the traction groups exhibit mutual cancellation or mutual balance under the current operating conditions.

[0071] In the above situation, this embodiment determines the interaction as benign synergy. Benign synergy means that the harmonic effects of multiple traction groups do not cause harmonic degradation at the traction power supply section level, and may even improve or stabilize the overall harmonic level, therefore they are not subject to harmonic suppression treatment.

[0072] When the interaction of the combined harmonic influence characteristics of multiple traction groups causes an increase in the overall harmonic level of the traction power supply section, the change of the overall harmonic level over time is further analyzed. If the overall harmonic level shows a continuously increasing trend over a continuous time period, it is determined that there is a harmonic synergistic amplification trend formed by the combined action of multiple traction groups.

[0073] If the overall harmonic level exhibits characteristics of increased amplitude fluctuations, irregular changes, or difficulty in maintaining a stable state during the time evolution process, it is determined that there is a harmonic coordinated instability trend formed by the combined action of multiple traction groups.

[0074] After completing the above determination, this embodiment, based on the analysis results at the traction power supply section level, forms inter-group cooperative behavior characteristics that characterize the benign cooperation, cooperative amplification trend, or cooperative instability trend. These inter-group cooperative behavior characteristics are used to describe the type of cooperative effect between different traction groups under the current operating state and their impact on the overall harmonic level of the traction power supply section, and serve as the basis for determining subsequent cooperative harmonic suppression strategies.

[0075] The following is a calculation example for analyzing the coordinated behavior of traction groups: To characterize the overall harmonic level of the traction power supply section after multiple traction groups work together, the equivalent harmonic influence at the section level is defined as: ; in, This characterizes the equivalent impact of the combined action of multiple traction groups on the overall harmonic level of the traction power supply section within a time window t. Compared to the previous time window when the harmonic effects decreased or remained stable, this indicates that the harmonic effects of multiple traction groups have a mutual cancellation or balancing effect at the section level.

[0076] In adjacent time windows and Within this section, the overall harmonic level variation is calculated: ; when When the signal is clear, it indicates that the synergistic effect of multiple traction groups has not caused an increase in the overall harmonic level of the section. In this embodiment, the synergistic behavior is judged as benign synergy.

[0077] when The time interval indicates that the synergistic effect of multiple traction groups leads to an increase in the overall harmonic level of the section, and further analysis of its temporal evolution characteristics is needed.

[0078] In this embodiment, the overall harmonic level variation of a segment within a continuous LLL time window is analyzed, and a variation sequence is constructed: ; If within the stated time window If a monotonous or near-monotonous upward trend is observed, it is determined that there is a harmonic synergistic amplification trend among multiple traction groups.

[0079] If within the stated time window If the amplitude fluctuates significantly, changes irregularly, or is difficult to converge, it is determined that there is a harmonic coordinated instability trend among multiple traction groups.

[0080] Based on the above calculation and judgment results, this embodiment constructs inter-group collaborative behavior characteristics at the segment level: ; Among them, "cooperation type" is used to indicate whether the traction groups in the current section are in a state of benign cooperation, cooperation amplification trend, or cooperation instability trend. This serves as the input basis for generating subsequent collaborative harmonic suppression strategies.

[0081] In this embodiment, when the traction group cooperative behavior analysis module determines that there is a trend of harmonic cooperative amplification or cooperative instability within the same traction power supply section, it further generates a cooperative harmonic suppression strategy for the traction group or traction unit based on the characteristics of inter-group cooperative behavior.

[0082] The generation process of the cooperative harmonic suppression strategy takes the inter-group cooperative behavior characteristics at the traction power supply section level as input, and focuses on determining the following two aspects of decision results: first, the range of traction groups participating in cooperative harmonic suppression; second, the degree of suppression participation of each participating traction group in the cooperative harmonic suppression process.

[0083] Determination of the range of traction groups involved in coordinated harmonic suppression: In this embodiment, based on the segment-level inter-group collaborative behavior characteristics obtained in Part 5 Extract the impact of each traction group on the overall harmonic level of the traction power supply section within the current time window.

[0084] For the g-th traction group, its influence can be defined by the belt direction influence as described above. Characterization: ; In this embodiment, traction groups that meet the following conditions are included in the candidate range for coordinated harmonic suppression: ; in, The preset impact threshold is used to filter traction groups that significantly enhance the overall harmonic level of the section under the current operating conditions.

[0085] Through the above screening, the set of traction groups participating in coordinated harmonic suppression is obtained: ; This step is used to avoid applying suppression to all traction groups at the same time, thereby reducing unnecessary control interventions.

[0086] Calculation and allocation of the degree of suppression of participation: After determining the range of traction groups involved in suppression, this embodiment further describes the traction group set. Within the traction group, the degree of inhibition participation was allocated differently.

[0087] In this embodiment, the degree of suppression participation of each traction group can be normalized according to the relative influence of each traction group on the overall harmonic level of the section. For example, the suppression weight of traction group g is defined as: ; in, Characterizes the relative participation of the traction group g in cooperative harmonic suppression. To prevent tiny positive numbers with a denominator of zero, the suppression weight is... It can be used to configure the intensity of harmonic suppression resources at the traction group level or traction unit level, thereby achieving differentiated suppression.

[0088] In this embodiment, based on the determination results of the cooperative trend type mentioned above, the cooperative harmonic suppression strategy is further distinguished: When a harmonic amplification trend is determined, the harmonic suppression strategy focuses on weakening the superposition effect of harmonics between different traction groups. By adjusting the response amplitude or participation weight of the suppression resources, the growth trend of the overall harmonic level of the section is reduced. When a harmonic coordinated instability trend is determined, the coordinated harmonic suppression strategy focuses on suppressing the unstable evolution behavior of harmonics. By limiting the harmonic output characteristics of some traction groups or improving the response speed of suppression resources, the stability of harmonic behavior in the traction power supply section is enhanced.

[0089] In this embodiment, when the traction group cooperative behavior analysis module determines that multiple traction groups are in a benign cooperative state, it does not generate a cooperative harmonic suppression strategy for the cooperative behavior, or it constrains the generated cooperative harmonic suppression strategy to a low participation or non-participation state.

[0090] Specifically, under benign synergistic conditions, the inhibition weights of each traction group can be... The restrictions are: ; Or maintain the resource allocation state of the previous time window unchanged, where This is the preset minimum participation threshold.

[0091] By imposing the above constraints, unnecessary control interventions are avoided when a favorable harmonic relationship has already been formed between traction groups, thereby maintaining the natural and stable state of harmonic behavior in the traction power supply section.

[0092] In this embodiment, after the collaborative harmonic suppression strategy is generated, the suppression resource control module performs control operations on the preset harmonic suppression resources according to the collaborative harmonic suppression strategy.

[0093] The harmonic suppression resources can be harmonic suppression devices or control resources installed in the traction power supply section, traction group level, or traction unit level, and their specific form is not the focus of this embodiment. This embodiment focuses on controlling the execution of the coordinated harmonic suppression process by adjusting the control parameters of the harmonic suppression resources.

[0094] In this embodiment, the suppression resource regulation module controls and adjusts the harmonic suppression resources corresponding to the traction group or traction unit participating in the collaborative harmonic suppression based on the collaborative harmonic suppression strategy generated above.

[0095] The control adjustment includes adjusting at least one or more of the following control parameters: The response amplitude of the harmonic suppression resource is used to limit the suppression strength of the harmonic suppression resource on harmonic components; The response speed of harmonic suppression resources is used to limit the dynamic response capability of harmonic suppression resources to harmonic changes. The participation priority of harmonic suppression resources is used to define the execution order or participation level of each harmonic suppression resource when multiple traction groups or multiple traction units need to be suppressed at the same time.

[0096] In this embodiment, the traction group suppression weights obtained in Part VI can be used. For example, parameter mapping is performed on the harmonic suppression resources corresponding to the traction groups involved in suppression, such as: ; in, This represents the control action amount allocated to the traction group g. This indicates the maximum control range allowed by the harmonic suppression resources.

[0097] By using the above methods, different traction groups or traction units can exhibit differentiated control response characteristics during the coordinated harmonic suppression process, thereby avoiding uniform and rigid suppression of all harmonic sources within the traction power supply section.

[0098] After performing harmonic suppression resource regulation operations, this embodiment continuously acquires the changes in the overall harmonic level of the traction power supply section through the traction unit harmonic response acquisition module or other section-level monitoring methods.

[0099] The overall harmonic level can be expressed as the segmental equivalent harmonic influence defined in Part 5. The characteristics are used to reflect the changing trend of harmonic behavior in the traction power supply section after the implementation of the cooperative harmonic suppression strategy.

[0100] In this embodiment, the suppression resource regulation module adjusts the control parameters of the harmonic suppression resources based on the changes in the overall harmonic level, so as to achieve adaptive control of the coordinated harmonic suppression process.

[0101] In this embodiment, the control action can be corrected based on the change in the overall harmonic level within adjacent time windows, for example: ; Where k is the feedback adjustment coefficient, used to limit the control correction range.

[0102] When the overall harmonic level shows a decreasing or stable trend, the suppression resource control module can reduce the control amount of the corresponding traction group or traction unit, or withdraw some harmonic suppression resources from participation. When the overall harmonic level still shows an increasing or unstable trend, the suppression resource regulation module can increase the control action or adjust the control parameter configuration to enhance the harmonic suppression effect.

[0103] Through the above-described control execution and feedback correction process, this embodiment achieves closed-loop adjustment of the coordinated harmonic suppression process without relying on fixed parameter configuration, enabling the harmonic suppression strategy to be dynamically adjusted according to the actual operating status within the traction power supply section, thereby improving the stability and adaptability of harmonic suppression.

[0104] In this embodiment, a harmonic suppression method for a rail transit electric traction system is provided, such as... Figure 2 As shown, this method is used to analyze and collaboratively suppress harmonic behavior formed by the combined action of multiple traction units in scenarios where multiple trains and multiple traction units operate simultaneously within the same traction power supply section.

[0105] The harmonic suppression method is implemented by executing the functional modules in the aforementioned harmonic suppression system of the rail transit electric traction system, and specifically includes the following steps.

[0106] Step S1: Acquisition of harmonic response information of traction unit.

[0107] During the operation of rail transit, harmonic response information of multiple traction units on each train within the same traction power supply section is obtained under the corresponding train operating conditions. The harmonic response information includes at least harmonic characteristic parameters in the output current or voltage of the traction unit.

[0108] Step S2: Traction group construction and intra-group influence analysis.

[0109] Multiple traction units on the same train are divided into a traction group. Based on the harmonic response information of each traction unit in the traction group and the electrical relationship between the traction units in the traction power supply network, the mutual influence relationship between the traction units in the traction group is analyzed. The harmonic effect results of the traction units are equivalently aggregated at the traction group level to generate a comprehensive harmonic influence characteristic that characterizes the overall harmonic behavior of the traction group.

[0110] Step S3: Analysis and trend determination of the traction group's coordinated behavior.

[0111] Within the same traction power supply section, based on the comprehensive harmonic influence characteristics of multiple traction groups, the interaction results of different traction groups under different operating conditions are analyzed to determine whether there is a harmonic synergistic amplification trend or synergistic instability trend formed by the joint action of multiple traction groups, and to form inter-group synergistic behavior characteristics that characterize the synergistic behavior state between traction groups; when the interaction of multiple traction groups reduces or stabilizes the overall harmonic level of the traction power supply section, the synergistic behavior is judged as benign synergy.

[0112] Step S4: Generation of collaborative harmonic suppression strategy.

[0113] When it is determined that there is a trend of harmonic co-amplification or co-instability, the range of traction groups participating in co-harmonic suppression and the degree of suppression participation of each traction group are determined according to the characteristics of the inter-group co-cooperation behavior, and a co-harmonic suppression strategy for the traction group or traction unit is generated; when it is determined to be benign cooperation, the participation of harmonic suppression resources is restricted or reduced, or the current configuration state of harmonic suppression resources is maintained.

[0114] Step S5: Suppress resource regulation and feedback correction steps.

[0115] According to the aforementioned collaborative harmonic suppression strategy, the preset harmonic suppression resources are controlled, and after the control is executed, the control parameters of the harmonic suppression resources are adjusted based on the changes in the overall harmonic level of the traction power supply section, so as to achieve adaptive control of the collaborative harmonic suppression process.

[0116] Through the above steps, the identification and control of the coordinated behavior of multiple traction groups at the traction power supply section level are realized, thereby suppressing the trend of harmonic coordinated amplification or coordinated instability caused by the combined action of multiple traction groups.

[0117] In summary, this embodiment addresses the complex harmonic effects caused by multiple trains and traction units operating within the same traction power supply section, and constructs a layered and progressive harmonic suppression scheme for rail transit electric traction systems. Through steps such as traction unit harmonic response acquisition, traction group construction and intra-group impact analysis, comprehensive harmonic impact characteristic generation, traction group cooperative behavior analysis, cooperative harmonic suppression strategy generation, and suppression resource regulation and feedback correction, a complete technical closed loop is achieved, from harmonic behavior perception and cooperative behavior recognition to suppression control execution.

[0118] This embodiment uses traction groups as the basic analysis object, and characterizes the interaction relationship between different traction groups at the traction power supply section level. It can effectively identify the benign synergy, harmonic synergy amplification trend or synergy instability trend formed under the joint action of multiple traction groups, and generate targeted synergistic harmonic suppression strategies on this basis. This avoids uniform and rigid suppression of all harmonic sources, and improves the fineness of harmonic suppression and the overall stability of the system operation.

[0119] Meanwhile, in the process of harmonic cooperative behavior analysis and cooperative suppression strategy generation, this embodiment introduces a benign cooperative constraint and feedback correction mechanism, which enables the participation of harmonic suppression resources to be limited or reduced when a favorable harmonic interaction relationship has been formed between traction groups. Furthermore, the control parameters are dynamically adjusted according to the changes in the overall harmonic level of the traction power supply section, thereby achieving adaptive control of the cooperative harmonic suppression process.

[0120] It should be noted that the above embodiments are only used to illustrate the technical concept and implementation of the present invention, and are not intended to limit the scope of protection of the present invention. For those skilled in the art, any equivalent substitutions or modifications made to the specific expression form of the harmonic response information of the traction unit, the calculation method of the comprehensive harmonic influence characteristics, the cooperative behavior judgment rules, and the specific control method of the harmonic suppression resources, without departing from the technical concept of the present invention, should fall within the scope of protection of the present invention.

[0121] The embodiments described above do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the above embodiments should be included within the scope of protection of this technical solution.

Claims

1. A harmonic suppression system for a rail transit electric traction system, characterized by, The method comprises the following steps: a traction unit harmonic response acquisition module is used to acquire harmonic response information of multiple traction units on each train in the same traction power supply section under corresponding train operating conditions during rail transit operation, wherein the harmonic response information at least includes harmonic characteristic parameters in traction unit output current or voltage; a traction group construction and intra-group influence analysis module is used to divide multiple traction units on the same train into a traction group, and analyze the mutual influence relationship between traction units in the traction group based on the harmonic response information of each traction unit in the traction group, and generate a comprehensive harmonic influence feature representing the overall harmonic behavior of the traction group; a traction group cooperative behavior analysis module is used to analyze the mutual influence of different traction groups under different operating conditions based on the comprehensive harmonic influence features of multiple traction groups in the same traction power supply section, judge whether there is a harmonic cooperative amplification or cooperative instability trend formed by the joint action of multiple traction groups, and output a group-to-group cooperative behavior feature representing the cooperative behavior state between the traction groups; a cooperative suppression strategy generation module is used to generate a cooperative harmonic suppression strategy for the traction group or the traction unit according to the group-to-group cooperative behavior feature when it is judged that there is the harmonic cooperative amplification or cooperative instability trend; a suppression resource regulation module is used to perform regulation operation on the preset harmonic suppression resource according to the cooperative harmonic suppression strategy.

2. A harmonic suppression system for a rail transit electric traction system as claimed in claim 1, characterized in that, The analysis of the mutual influence relationship between traction units in the traction group based on the harmonic response information of each traction unit in the traction group, and the generation of the comprehensive harmonic influence feature representing the overall harmonic behavior of the traction group specifically comprise: based on the harmonic response information of multiple traction units in the same traction group under the same train operating instructions and power supply conditions, and combined with the electrical correlation relationship of traction units in the traction group in the traction power supply network, the degree of action of each traction unit harmonic response in the overall harmonic behavior of the traction group is analyzed and decomposed, and the action results of each traction unit are equivalently aggregated at the traction group level, thereby forming an equivalent comprehensive harmonic influence feature representing the traction group in the traction power supply section.

3. A harmonic suppression system for a rail transit electric traction system as claimed in claim 2, characterized in that, The comprehensive harmonic influence feature is a structured feature set at the traction group level, which at least includes: an influence component representing the degree of action distribution of each traction unit in the traction group on the overall harmonic behavior of the traction group; a correlation component representing the superposition relationship of harmonic action results between the traction units; The structured feature set is used to describe the overall harmonic influence state of the traction group in the traction power supply section at the traction group level.

4. A harmonic suppression system for a rail transit electric traction system according to claim 3, characterized in that, The influence component includes a positive influence component for representing the enhancement effect of the traction group on the overall harmonic level of the traction power supply section, and a reverse influence component for representing the weakening or offset effect of the traction group on the overall harmonic level of the traction power supply section.

5. A harmonic suppression system for a rail transit electric traction system as claimed in claim 1, wherein When the group-to-group cooperative behavior feature is generated by the traction group cooperative behavior analysis module, the comprehensive harmonic influence features of multiple traction groups in the same traction power supply section are taken as the analysis object, the influence direction of the interaction results of different traction group comprehensive harmonic influence features in the time evolution process on the overall harmonic level of the traction power supply section is analyzed; When it is judged that the interaction of the harmonic influence characteristics of multiple traction groups reduces or stabilizes the overall harmonic level of the traction power supply section, the interaction is determined to be benign cooperation, and is not taken as a harmonic suppression processing object; When it is judged that the interaction of the harmonic influence characteristics of multiple traction groups increases the overall harmonic level of the traction power supply section, further analysis is performed on the change of the overall harmonic level over time; If the overall harmonic level presents a continuously increasing change trend, it is determined that there is a cooperative amplification trend; If the overall harmonic level presents an unstable evolution characteristic, it is determined that there is a cooperative instability trend; And based on the above determination results, a group cooperation behavior characteristic representing the cooperative amplification trend or the cooperative instability trend is formed.

6. A harmonic suppression system for a rail transit electric traction system as claimed in claim 1, characterized in that, The generation of the cooperative harmonic suppression strategy for the traction group or the traction unit according to the group cooperation behavior characteristic specifically includes the following steps: When the traction group cooperation behavior analysis module judges that there is a harmonic cooperative amplification or cooperative instability trend, based on the influence degree of different traction groups on the overall harmonic level of the traction power supply section reflected in the group cooperation behavior characteristic, the range of traction groups participating in cooperative harmonic suppression and the corresponding suppression participation degree of each traction group are determined; Further, according to the type of the cooperative amplification trend or the cooperative instability trend, a cooperative harmonic suppression strategy for weakening the harmonic mutual superposition effect between traction groups or suppressing unstable harmonic evolution behavior is generated; The cooperative harmonic suppression strategy is used to differentially configure the regulation mode and regulation intensity of the harmonic suppression resource at the traction group level or the traction unit level.

7. A harmonic suppression system for a rail transit electric traction system as claimed in claim 5, characterized in that, When the traction group cooperation behavior analysis module judges that the cooperation is benign, the cooperative harmonic suppression strategy is configured to limit or reduce the participation degree of the harmonic suppression resource, or maintain the current configuration state of the harmonic suppression resource.

8. A harmonic suppression system for a rail transit electric traction system as claimed in claim 1, characterized in that, The suppression resource regulation module is configured to perform control adjustment on the harmonic suppression resource corresponding to the traction group or the traction unit participating in cooperative harmonic suppression based on the cooperative harmonic suppression strategy, the control adjustment including at least adjusting a control parameter of the harmonic suppression resource, the control parameter being used to limit at least one of the response amplitude, the response speed or the participation priority of the harmonic suppression resource, so that different traction groups or traction units present different control response characteristics in the process of cooperative harmonic suppression.

9. A harmonic suppression system for a rail transit electric traction system as claimed in claim 8, characterized in that, After executing the cooperative harmonic suppression strategy, the suppression resource regulation module is configured to perform feedback adjustment on the control parameter of the harmonic suppression resource based on the change of the overall harmonic level of the traction power supply section, wherein when the overall harmonic level presents a decreasing or stable trend, the control intensity of the harmonic suppression resource is reduced or the participation of part of the harmonic suppression resource is exited; when the overall harmonic level still presents an increasing or unstable change trend, the control intensity of the harmonic suppression resource is increased or the control parameter configuration of the harmonic suppression resource is adjusted.

10. The method of claim 1-9, applied to the harmonic suppression system of claim 1-9, wherein, Specifically includes the following steps: In the process of rail transit operation, harmonic response information of multiple traction units on each train in the same traction power supply section under corresponding train operation conditions is obtained, and the harmonic response information at least includes harmonic characteristic parameters in traction unit output current or voltage; Multiple traction units on the same train are divided into a traction group, and based on the harmonic response information of each traction unit in the traction group, the mutual influence relationship between the traction units in the traction group is analyzed, and a comprehensive harmonic influence feature representing the overall harmonic behavior of the traction group is generated; In the same traction power supply section, based on the comprehensive harmonic influence features of multiple traction groups, the mutual influence of different traction groups under different operating conditions is analyzed, it is judged whether there is a harmonic cooperative amplification or cooperative instability trend formed by the joint action of multiple traction groups, and a group intercoordination behavior feature representing the coordination behavior state between traction groups is generated; When it is judged that the harmonic cooperative amplification or cooperative instability trend exists, a cooperative harmonic suppression strategy for the traction group or the traction unit is generated according to the group intercoordination behavior feature; According to the cooperative harmonic suppression strategy, the preset harmonic suppression resource is executed to suppress the harmonic cooperative amplification or cooperative instability trend caused by the joint action of multiple traction groups.

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