CN117783704A - Three-phase asymmetric monitoring method, device, medium and equipment for bidirectional converter - Google Patents
Three-phase asymmetric monitoring method, device, medium and equipment for bidirectional converter Download PDFInfo
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Abstract
The application discloses a three-phase asymmetric monitoring method, device, medium and equipment of a bidirectional converter, which are applied to the technical field of monitoring of the bidirectional converter, and the method comprises the following steps: the impedance matrix of the three-phase incoming line of the bidirectional converter is calculated by analyzing a system schematic diagram, and the current value of the three-phase incoming line of the bidirectional converter is acquired in real time, the voltage value is synchronously calculated, the current positive sequence component, the current negative sequence component and the current zero sequence component are calculated according to the current value, or the voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component are calculated according to the voltage value, and the symmetrical state of the bidirectional converter is determined according to the current positive sequence component, the current negative sequence component and the current zero sequence component, or the voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component, so that the symmetrical state of the bidirectional converter is identified in real time, the identification precision and the identification efficiency of the symmetrical state are improved, and the operation safety and the reliability of traction rail transit vehicles are improved.
Description
Technical Field
The application relates to the technical field of monitoring of bidirectional converters, in particular to a method, a device, a medium and equipment for monitoring three-phase asymmetry of a bidirectional converter.
Background
With the continuous development of urban rail transit, more and more traction rail transit vehicles are widely applied to large cities, and the traction rail transit vehicles need to run along a specific traffic route to acquire electric energy from a power supply system. The existing traction power supply system mostly adopts a three-phase power supply mode, a substation takes power through a three-phase power grid, and the power is converted into direct current through a bidirectional converter and is output to traction rail transit vehicles.
Because more and more traction rail transit vehicles run simultaneously and cause larger pressure on a power grid, and the power grid system is complex, asymmetric risks exist in the three-phase incoming line of the traction power supply system possibly caused by power grid fluctuation, load change or system internal faults and the like in the running process. Asymmetric operation can lead to reduced efficiency of the traction power system, increased equipment loss and even safety risks. Therefore, there is a need to monitor for an asymmetric condition in a traction power supply system.
The existing traction power supply system asymmetry state monitoring is mostly to collect and identify the asymmetry information or parameters in the traction power supply system, however, the asymmetry analysis result of the traction power supply system is likely to cause inaccurate collected data due to other interference factors, so that the identification error is large.
Disclosure of Invention
The present application has been made in order to solve the above technical problems. The embodiment of the application provides a three-phase asymmetry monitoring method, device, medium and equipment for a bidirectional converter, which are used for acquiring current values and voltage values of the bidirectional converter in real time, calculating positive sequence, negative sequence and zero sequence components, and judging whether an asymmetry state exists or not based on the component values so as to improve the accuracy of asymmetry judgment.
According to one aspect of the present application, there is provided a method for monitoring three-phase asymmetry of a bidirectional converter, applied to a flexible direct current traction power supply system, including: acquiring a system schematic diagram of the flexible direct current traction power supply system; wherein the system schematic diagram comprises various electrical elements and connection structures thereof in the flexible direct-current traction power supply system; according to the system schematic diagram, calculating to obtain an impedance matrix of the three-phase incoming line of the bidirectional converter; collecting current values of three-phase incoming lines of the bidirectional converter in real time; based on the impedance matrix and the current value, calculating to obtain a voltage value of a three-phase incoming line of the bidirectional converter; calculating according to the current value to obtain a current positive sequence component, a current negative sequence component and a current zero sequence component of the current value, or calculating according to the voltage value to obtain a voltage positive sequence component, a voltage negative sequence component and a voltage zero sequence component of the voltage value; determining a symmetrical state of the bidirectional converter according to the current positive sequence component, the current negative sequence component and the current zero sequence component, or determining a symmetrical state of the bidirectional converter according to the voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component; wherein the symmetrical state of the bidirectional converter comprises symmetry and asymmetry.
In an embodiment, said determining the symmetry state of the bidirectional converter from the current positive sequence component, the current negative sequence component and the current zero sequence component comprises: determining that the symmetrical state of the bidirectional converter is asymmetrical if any one of the following conditions is satisfied: the ratio of the current negative sequence component to the current positive sequence component is greater than a preset first ratio threshold; the ratio of the current zero sequence component to the current positive sequence component is greater than a preset second ratio threshold; the current negative sequence component exceeds a preset first limit value range; the zero sequence component of the current exceeds a preset second limit value range; and the influence relevance of the higher-order harmonic component of the bidirectional converter on the current value is greater than a preset relevance threshold.
In an embodiment, said determining the symmetry state of the bidirectional converter from the voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component comprises: determining that the symmetrical state of the bidirectional converter is asymmetrical if any one of the following conditions is satisfied: the ratio of the negative voltage sequence component to the positive voltage sequence component is greater than a preset third ratio threshold; the ratio of the voltage zero sequence component to the voltage positive sequence component is greater than a preset fourth ratio threshold; the negative sequence component of the voltage exceeds a preset third limit value range; the zero sequence component of the voltage exceeds a preset fourth limit value range; the unbalance rate of the voltage value is larger than a preset balance rate threshold value; wherein the unbalance rate represents a time duty ratio in which a difference between the voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component is greater than a preset value; and the influence relevance of the higher-order harmonic component of the bidirectional converter on the voltage value is greater than a preset relevance threshold.
In an embodiment, the calculating, according to the system schematic diagram, an impedance matrix of a three-phase incoming line of the bidirectional converter includes: the calculation mode of the impedance matrix of the three-phase incoming line of the bidirectional converter comprises the following steps:
；
wherein the self-impedance is，R S Is the resistance value of the electrical component,L S is the inductance value, the transimpedance of the electrical component>，R M Is the resistance value between the electrical components,L M is the inductive reactance value between the electrical components,iin imaginary units.
In an embodiment, the acquiring, in real time, the current value of the three-phase incoming line of the bidirectional converter includes: acquiring three-phase current values of three-phase incoming lines of the bidirectional converter in real time; and respectively calculating the complex current values of the three-phase incoming lines of the bidirectional converter according to the three-phase current values.
In an embodiment, the calculating manner of the positive sequence component, the negative sequence component and the zero sequence component comprises:
，
，
；
wherein,，iin units of imaginary numbers,AUZ、AUF、AUL、BUZ、BUF、BUL、CUZ、CUF、CULa voltage positive sequence component, a voltage negative sequence component and a voltage zero sequence component of A, B, C three-phase voltage respectively,UU1、UU2、UU3 are voltage values of A, B, C three-phase voltages, respectively.
In an embodiment, the calculating the current positive sequence component, the current negative sequence component and the current zero sequence component of the current value according to the current value includes: and calculating to obtain a current positive sequence component, a current negative sequence component and a current zero sequence component of the current value according to the modulus value and the argument of the current value.
According to another aspect of the present application, there is provided a three-phase asymmetry monitoring apparatus for a bidirectional converter, which is provided in a flexible dc traction power supply system, comprising: the principle acquisition module is used for acquiring a system principle diagram of the flexible direct-current traction power supply system; wherein the system schematic diagram comprises various electrical elements and connection structures thereof in the flexible direct-current traction power supply system; the impedance calculation module is used for calculating and obtaining an impedance matrix of the three-phase incoming line of the bidirectional converter according to the system schematic diagram; the current acquisition module is used for acquiring current values of three-phase incoming lines of the bidirectional converter in real time; the voltage calculation module is used for calculating and obtaining the voltage value of the three-phase incoming line of the bidirectional converter based on the impedance matrix and the current value; the component calculation module is used for calculating a current positive sequence component, a current negative sequence component and a current zero sequence component of the current value according to the current value, or calculating a voltage positive sequence component, a voltage negative sequence component and a voltage zero sequence component of the voltage value according to the voltage value; the state determining module is used for determining the symmetrical state of the bidirectional converter according to the current positive sequence component, the current negative sequence component and the current zero sequence component, or determining the symmetrical state of the bidirectional converter according to the voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component; wherein the symmetrical state of the bidirectional converter comprises symmetry and asymmetry.
According to another aspect of the present application, there is provided a computer readable storage medium storing a computer program for performing any one of the methods described above.
According to another aspect of the present application, there is provided an electronic device including: a processor; a memory for storing the processor-executable instructions; the processor is configured to perform any of the methods described above.
According to the three-phase asymmetric monitoring method, device, medium and equipment for the bidirectional converter, a system schematic diagram of a flexible direct-current traction power supply system is obtained; according to a system schematic diagram, calculating to obtain an impedance matrix of a three-phase incoming line of the bidirectional converter; collecting current values of three-phase incoming wires of the bidirectional converter in real time; based on the impedance matrix and the current value, calculating to obtain the voltage value of the three-phase incoming line of the bidirectional converter; calculating according to the current value to obtain a current positive sequence component, a current negative sequence component and a current zero sequence component of the current value, or calculating according to the voltage value to obtain a voltage positive sequence component, a voltage negative sequence component and a voltage zero sequence component of the voltage value; determining the symmetrical state of the bidirectional converter according to the current positive sequence component, the current negative sequence component and the current zero sequence component, or determining the symmetrical state of the bidirectional converter according to the voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component; the method comprises the steps of calculating an impedance matrix of a three-phase incoming line of the bidirectional converter through analyzing a system schematic diagram, synchronously calculating a voltage value by collecting current values of the three-phase incoming line of the bidirectional converter in real time, calculating a current positive sequence component, a current negative sequence component and a current zero sequence component according to the current values, or calculating a voltage positive sequence component, a voltage negative sequence component and a voltage zero sequence component according to the voltage values, and determining the symmetrical state of the bidirectional converter according to the current positive sequence component, the current negative sequence component and the current zero sequence component, or the voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component so as to identify the symmetrical state of the bidirectional converter in real time, thereby improving the identification precision and the identification efficiency of the symmetrical state and further improving the operation safety and reliability of traction rail transit vehicles.
Drawings
Fig. 1 is a schematic flow chart of a three-phase asymmetry monitoring method for a bidirectional converter according to an embodiment of the present application.
Fig. 2 is a structural block diagram of a three-phase asymmetric monitoring device for a bidirectional converter according to an embodiment of the present application.
Fig. 3 is a block diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Furthermore, in the exemplary embodiments, since the same reference numerals denote the same components having the same structures or the same steps of the same methods, if an embodiment is exemplarily described, only structures or methods different from those of the described embodiment will be described in other exemplary embodiments.
Throughout the specification and claims, when an element is referred to as being "connected" to another element, the one element can be "directly connected" to the other element or be "electrically connected" to the other element through a third element. Furthermore, unless explicitly described to the contrary, the term "comprising" and its corresponding terms should be construed to include only the recited components and should not be construed to exclude any other components.
The method provided by the embodiment of the application can be executed by electronic equipment, and the electronic equipment can be a server or terminal equipment, wherein the server can be an independent physical server, a server cluster or a distributed system formed by a plurality of physical servers, or a cloud server for providing cloud computing service. The terminal device may be, but is not limited to, a smart phone, a tablet computer, a desktop computer, etc.
Fig. 1 is a schematic flow chart of a three-phase asymmetry monitoring method for a bidirectional converter according to an embodiment of the present application. The three-phase asymmetry monitoring method of the bidirectional converter is applied to a flexible direct current traction power supply system, and as shown in fig. 1, the three-phase asymmetry monitoring method of the bidirectional converter comprises the following steps:
step 110: a system schematic diagram of a flexible direct current traction power supply system is obtained.
The system schematic diagram comprises various electrical elements and connection structures thereof in the flexible direct-current traction power supply system. Specifically, the system schematic diagram comprises an external power supply, a medium-voltage ring network, an alternating current circuit breaker, a three-phase alternating current inlet wire, a bidirectional converter and the like, and the external power supply, the medium-voltage ring network, the alternating current circuit breaker, the three-phase alternating current inlet wire and the bidirectional converter are electrically connected. According to the flexible direct-current traction power supply system, the system schematic diagram of the flexible direct-current traction power supply system is obtained, so that the types, the connection structures and the relations of all the electrical elements in the flexible direct-current traction power supply system are known, and the electrical characteristics of all the electrical elements can be clarified.
Step 120: according to the system schematic diagram, an impedance matrix of the three-phase incoming line of the bidirectional converter is obtained through calculation.
Specifically, the system schematic diagram of the flexible direct current traction power supply system can be analyzed in advance to obtain the electrical characteristics of each electrical element in the flexible direct current traction power supply system, a simulation model of the flexible direct current traction power supply system is obtained based on the system schematic diagram of the flexible direct current traction power supply system, and an impedance matrix of the bidirectional converter, which is performed by three phases, is obtained through simulation calculation, wherein the impedance matrix represents the impedance value, specifically including resistance and inductance, of each electrical element in the flexible direct current traction power supply system.
Step 130: and collecting current values of three-phase incoming lines of the bidirectional converter in real time.
The current value of the three phases of the bidirectional converter is collected in real time, so that whether the current of the three-phase incoming line of the bidirectional converter is normal or not is monitored in real time, and the symmetrical state of the three-phase incoming line of the bidirectional converter can be known more quickly and accurately.
Step 140: and calculating the voltage value of the three-phase incoming line of the bidirectional converter based on the impedance matrix and the current value.
After the current value of the three-phase incoming line of the bidirectional converter is acquired, the voltage value of the three-phase incoming line of the bidirectional converter can be calculated in real time based on the impedance matrix and the current value, so that the voltage monitoring of the three-phase incoming line of the bidirectional converter is realized. Because some interference factors which are difficult to quantify or cannot be predicted possibly exist in an actual power supply system, a certain deviation exists between an impedance matrix calculated according to a system schematic diagram of the power supply system and actual impedance, and in an actual monitoring process, the accuracy of the impedance matrix can be verified by acquiring a voltage value and a current value in real time, and the impedance matrix obtained by theoretical calculation is adjusted according to the voltage value and the current value acquired in real time so as to obtain an impedance value which is more fit with an actual operation process.
Step 150: and calculating according to the current value to obtain a current positive sequence component, a current negative sequence component and a current zero sequence component of the current value, or calculating according to the voltage value to obtain a voltage positive sequence component, a voltage negative sequence component and a voltage zero sequence component of the voltage value.
After the current value of the three-phase incoming line of the bidirectional converter is acquired, the current positive sequence component, the current negative sequence component and the current zero sequence component of the three-phase incoming line of the bidirectional converter are calculated based on the current value, so that the current component value of the three-phase incoming line of the bidirectional converter is acquired, and the symmetrical state of the three-phase incoming line of the bidirectional converter is judged more accurately. Or, after the voltage value of the three-phase incoming line of the bidirectional converter is obtained by calculation, the voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component of the three-phase incoming line of the bidirectional converter are calculated based on the voltage value, so that the symmetrical state of the three-phase incoming line of the bidirectional converter can be judged more accurately. It should be understood that, the current component value or the voltage component value can be selected only as the monitoring judgment basis of the symmetrical state (only the required component value can be calculated according to the requirement at this time), or the current component value or the voltage component value can be selected at the same time as the monitoring judgment basis of the symmetrical state, so as to further improve the monitoring accuracy and timeliness.
Step 160: and determining the symmetrical state of the bidirectional converter according to the current positive sequence component, the current negative sequence component and the current zero sequence component, or determining the symmetrical state of the bidirectional converter according to the voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component.
The symmetrical state of the bidirectional converter comprises symmetry and asymmetry. After the current positive sequence component, the current negative sequence component and the current zero sequence component are calculated, whether the bidirectional converter is symmetrical or not can be judged based on the current positive sequence component, the current negative sequence component and the current zero sequence component. The voltage value is calculated based on the current value, and if the asymmetry of the bidirectional current transformer can be judged according to the current component, the voltage value can be also reflected and judged in the voltage, so that after the voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component are calculated, whether the bidirectional current transformer is symmetrical or not can be judged based on the voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component, so that the asymmetry state of the bidirectional current transformer can be rapidly and accurately perceived, and the monitoring timeliness and the monitoring accuracy are improved. It should be appreciated that the present application may determine whether the bi-directional current transformer is symmetrical based on only one of the current component and the voltage component, or may monitor both simultaneously to achieve mutually-evidence determination of whether the bi-directional current transformer is symmetrical.
According to the three-phase asymmetric monitoring method for the bidirectional converter, a system schematic diagram of a flexible direct-current traction power supply system is obtained; according to a system schematic diagram, calculating to obtain an impedance matrix of a three-phase incoming line of the bidirectional converter; collecting current values of three-phase incoming wires of the bidirectional converter in real time; based on the impedance matrix and the current value, calculating to obtain the voltage value of the three-phase incoming line of the bidirectional converter; calculating according to the current value to obtain a current positive sequence component, a current negative sequence component and a current zero sequence component of the current value, or calculating according to the voltage value to obtain a voltage positive sequence component, a voltage negative sequence component and a voltage zero sequence component of the voltage value; determining the symmetrical state of the bidirectional converter according to the current positive sequence component, the current negative sequence component and the current zero sequence component, or determining the symmetrical state of the bidirectional converter according to the voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component; the method comprises the steps of calculating an impedance matrix of a three-phase incoming line of the bidirectional converter through analyzing a system schematic diagram, synchronously calculating a voltage value by collecting current values of the three-phase incoming line of the bidirectional converter in real time, calculating a current positive sequence component, a current negative sequence component and a current zero sequence component according to the current values, or calculating a voltage positive sequence component, a voltage negative sequence component and a voltage zero sequence component according to the voltage values, and determining the symmetrical state of the bidirectional converter according to the current positive sequence component, the current negative sequence component and the current zero sequence component, or the voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component so as to identify the symmetrical state of the bidirectional converter in real time, thereby improving the identification precision and the identification efficiency of the symmetrical state and further improving the operation safety and reliability of traction rail transit vehicles.
In an embodiment, the implementation manner of the step 120 may be: the calculation mode of the impedance matrix of the three-phase incoming line of the bidirectional converter comprises the following steps:
；
wherein the self-impedance is，R S Is the resistance value of the electrical component,L S is the inductance value, the transimpedance of the electrical component>，R M Is the resistance value between the electrical components,L M is the inductive reactance value between the electrical components,iin imaginary units.
The self-impedance represents the degree of obstruction of the current by the electrical element in the circuit, and when the impedance of the electrical element increases, the flow of the current is more limited, so that the greater the self-impedance, the greater the limitation of the electrical element to the current. The transimpedance represents the degree of hindrance caused by the interaction between two electrical components in the circuit, and the more intense the interaction between the two electrical components increases, the greater the transimpedance, which means the more intense the interaction between the two electrical components. According to the method, the self impedance and the transimpedance of the electrical element are considered to form the impedance matrix of the three-phase incoming line of the bidirectional converter, so that the impedance of the bidirectional converter can be digitized, and the voltage value of the three-phase incoming line of the bidirectional converter can be accurately calculated.
In an embodiment, the specific implementation manner of the step 130 may be: collecting three-phase current values of three-phase incoming lines of the bidirectional converter in real time; and respectively calculating complex current values of the three-phase incoming lines of the bidirectional converter according to the three-phase current values.
The three-phase current value of the three-phase incoming line of the bidirectional converter is collected in real time, so that the three-phase incoming line of the bidirectional converter is monitored in real time. Specifically, the current monitoring device (such as a current transformer) is arranged at the upper port or the lower port of the bidirectional current transformer so as to acquire the three-phase current value of the three-phase incoming line of the bidirectional current transformer, namely, the A, B, C three-phase current value in real time; after the three-phase current values of the three-phase incoming line of the bidirectional converter are acquired, the complex-form current values II1, II2 and II3 of the three-phase incoming line of the bidirectional converter are respectively calculated according to the three-phase current values. Specifically, the complex current values II1, II2, II3 of the three-phase incoming line of the bidirectional converter in the present application are calculated as follows:
wherein, I1, I2 and I3 are respectively the modulus values of A, B, C three-phase current values, and IP1, IP2 and IP3 are respectively the argument of A, B, C three-phase current values.
In an embodiment, the implementation manner of the step 150 may be: and calculating to obtain a current positive sequence component, a current negative sequence component and a current zero sequence component of the current value according to the modulus value and the argument of the current value.
After the three-phase current value is acquired in real time, the current positive sequence component, the current negative sequence component and the current zero sequence component of the current value are respectively calculated according to the modulus value and the argument of the three-phase current value, and the specific calculation mode can adopt the following formula:
positive sequence component of a-phase current；
Negative sequence component of A-phase current；
Zero sequence component of A-phase current；
B-phase current positive sequence component；
Negative sequence component of B-phase current；
Zero sequence component of B-phase current；
Positive sequence component of C-phase current；
Negative sequence component of C-phase current；
Zero sequence component of C-phase current；
Wherein,the modulus value of A, B, C three-phase current values, respectively, ">、/>The argument of each of the A, B, C three-phase current values.
In an embodiment, the specific implementation manner of the step 160 may be: the symmetrical state of the bidirectional converter is determined to be asymmetrical if any one of the following conditions is satisfied: the ratio of the current negative sequence component to the current positive sequence component is greater than a preset first ratio threshold; the ratio of the current zero sequence component to the current positive sequence component is greater than a preset second ratio threshold; the current negative sequence component exceeds a preset first limit value range; the zero sequence component of the current exceeds a preset second limit value range; the influence relevance of the higher harmonic component of the bidirectional converter on the current value is larger than a preset relevance threshold.
If the ratio of the current negative sequence component to the current positive sequence component is greater than a preset first ratio threshold, or the ratio of the current zero sequence component to the current positive sequence component is greater than a preset second ratio threshold, namely the ratio between the current negative sequence component and the current positive sequence component (the ratio between the current negative sequence component and the current positive sequence component in a single phase can be the ratio between the current negative sequence component and the current positive sequence component in a three phase) is too large, or the ratio between the current zero sequence component and the current positive sequence component in a single phase (the ratio between the current zero sequence component and the current positive sequence component in a three phase can be the ratio between the current zero sequence component and the current positive sequence component in a three phase) is too large, the current asymmetry of the bidirectional converter or the unbalance between the current zero sequence component and the current positive sequence component in the bidirectional converter is also illustrated.
If the current negative sequence component exceeds the preset first limit value range or the current zero sequence component exceeds the preset second limit value range, namely the current negative sequence component can be a single-phase current negative sequence component or the sum of three-phase current negative sequence components) or the current zero sequence component (can be a single-phase current zero sequence component or the sum of three-phase current zero sequence components) is too large, the current negative sequence component or the current zero sequence component is abnormal, and the current asymmetry of the bidirectional converter, namely the bidirectional converter is also illustrated.
According to the method, the influence relevance function between the high-order harmonic component and the current positive sequence component, the current negative sequence component and the current zero sequence component of the current value is established by analyzing the influence relevance of the high-order harmonic component of the bidirectional converter on the current positive sequence component, the current negative sequence component and the current zero sequence component of the current value, and specifically, the establishment mode of the influence relevance function can be that the high-order harmonic content and distribution, the corresponding current positive sequence component, the current negative sequence component and the current zero sequence component are obtained through simulation of the simulation model, and the influence relevance function, namely the mapping relation function between the current positive sequence component, the current negative sequence component, the current zero sequence component and the high-order harmonic component, is obtained based on the high-order harmonic content, the distribution and the corresponding current positive sequence component, the current negative sequence component and the current zero sequence component in a learning or fitting mode. If the influence relevance of the higher-order harmonic component of the bidirectional converter on the current value is greater than a preset relevance threshold, namely the relevance among the current positive sequence component, the current negative sequence component, the current zero sequence component and the higher-order harmonic component exceeds a normal range, the fact that harmonic distortion occurs in the higher-order harmonic at the moment is indicated, namely the bidirectional converter is asymmetric.
It will be appreciated that the symmetry state of the bi-directional converter can be determined to be symmetrical only if the above conditions are not met at the same time.
In one embodiment, the calculation modes of the positive sequence component, the negative sequence component and the zero sequence component include:
，
，
；
wherein,，iin units of imaginary numbers,AUZ、AUF、AUL、BUZ、BUF、BUL、CUZ、CUF、CULa voltage positive sequence component, a voltage negative sequence component and a voltage zero sequence component of A, B, C three-phase voltage respectively,UU1、UU2、UU3 are voltage values of A, B, C three-phase voltages, respectively.
In an embodiment, the specific implementation manner of the step 160 may further be: the symmetrical state of the bidirectional converter is determined to be asymmetrical if any one of the following conditions is satisfied: the ratio of the negative voltage sequence component to the positive voltage sequence component is greater than a preset third ratio threshold; the ratio of the voltage zero sequence component to the voltage positive sequence component is greater than a preset fourth ratio threshold; the negative sequence component of the voltage exceeds a preset third limit value range; the zero sequence component of the voltage exceeds a preset fourth limit value range; the unbalance rate of the voltage value is larger than a preset balance rate threshold value; the unbalance rate represents the time duty ratio that the difference among the voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component is larger than a preset value; the influence relevance of the higher-order harmonic component of the bidirectional converter on the voltage value is larger than a preset relevance threshold.
If the ratio of the negative voltage sequence component to the positive voltage sequence component is greater than a preset third ratio threshold, or the ratio of the zero voltage sequence component to the positive voltage sequence component is greater than a preset fourth ratio threshold, namely the ratio between the negative voltage sequence component and the positive voltage sequence component (which may be the ratio between the negative voltage sequence component and the positive voltage sequence component in a single phase or the ratio between the negative voltage sequence component and the positive voltage sequence component in a three phase) is too large, or the ratio between the zero voltage sequence component and the positive voltage sequence component (which may be the ratio between the zero voltage sequence component and the positive voltage sequence component in a single phase or the ratio between the zero voltage sequence component and the positive voltage sequence component in a three phase) is too large, then the voltage asymmetry of the bidirectional converter, namely the bidirectional converter, is illustrated.
If the voltage negative sequence component exceeds the preset third limit value range or the voltage zero sequence component exceeds the preset fourth limit value range, namely the voltage negative sequence component can be a single-phase voltage negative sequence component or the sum of three-phase voltage negative sequence components) is overlarge or the voltage zero sequence component (can be a single-phase voltage zero sequence component or the sum of three-phase voltage zero sequence components) is overlarge, the abnormal voltage negative sequence component or the abnormal voltage zero sequence component is indicated, and the asymmetric voltage of the bidirectional converter is also indicated.
If the unbalance rate of the voltage value is larger than a preset balance rate threshold value, namely the time duty ratio of the difference among the positive sequence component, the negative sequence component and the zero sequence component is larger than a preset value, the time duration of the unbalance state among the components of the voltage is longer, and the voltage asymmetry of the bidirectional converter, namely the bidirectional converter is indicated.
According to the method, the influence relevance between the high-order harmonic component and the voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component of the voltage value is analyzed, so that an influence relevance function between the high-order harmonic component and the voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component of the voltage value is built, specifically, the building mode of the influence relevance function can be that the high-order harmonic content and distribution, the corresponding voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component are obtained through simulation of the simulation model, and the influence relevance function, namely the mapping relation function between the voltage positive sequence component, the voltage negative sequence component, the voltage zero sequence component and the high-order harmonic component, is obtained based on the high-order harmonic content, the distribution and the corresponding voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component in a learning or fitting mode. If the influence relevance of the higher-order harmonic component of the bidirectional converter on the voltage value is greater than a preset relevance threshold, namely the relevance among the positive voltage sequence component, the negative voltage sequence component, the zero voltage sequence component and the higher-order harmonic component exceeds a normal range, the fact that harmonic distortion occurs in the higher-order harmonic at the moment is indicated, namely the bidirectional converter is asymmetric.
Fig. 2 is a structural block diagram of a three-phase asymmetric monitoring device for a bidirectional converter according to an embodiment of the present application. The three-phase asymmetric monitoring device of the bidirectional converter is disposed in a flexible dc traction power supply system, as shown in fig. 2, and the three-phase asymmetric monitoring device 20 of the bidirectional converter includes: the principle acquisition module 21 is used for acquiring a system principle diagram of the flexible direct current traction power supply system; the system schematic diagram comprises various electrical elements and connection structures thereof in the flexible direct-current traction power supply system; the impedance calculation module 22 is configured to calculate, according to a system schematic diagram, an impedance matrix of the three-phase incoming line of the bidirectional converter; the current acquisition module 23 is used for acquiring current values of three-phase incoming wires of the bidirectional converter in real time; the voltage calculation module 24 is configured to calculate, based on the impedance matrix and the current value, a voltage value of a three-phase incoming line of the bidirectional converter; a component calculation module 25, configured to calculate a current positive sequence component, a current negative sequence component, and a current zero sequence component of the current value according to the current value, or calculate a voltage positive sequence component, a voltage negative sequence component, and a voltage zero sequence component of the voltage value according to the voltage value; a state determining module 26, configured to determine a symmetrical state of the bidirectional converter according to the current positive sequence component, the current negative sequence component and the current zero sequence component, or determine a symmetrical state of the bidirectional converter according to the voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component; the symmetrical state of the bidirectional converter comprises symmetry and asymmetry.
According to the three-phase asymmetric monitoring device for the bidirectional converter, a system schematic diagram of a flexible direct-current traction power supply system is obtained through a principle obtaining module 21; the impedance calculation module 22 calculates an impedance matrix of the three-phase incoming line of the bidirectional converter according to the system schematic diagram; the current acquisition module 23 acquires current values of three-phase incoming lines of the bidirectional converter in real time; the voltage calculation module 24 calculates and obtains the voltage value of the three-phase incoming line of the bidirectional converter based on the impedance matrix and the current value; the component calculation module 25 calculates a current positive sequence component, a current negative sequence component and a current zero sequence component of the current value according to the current value, or calculates a voltage positive sequence component, a voltage negative sequence component and a voltage zero sequence component of the voltage value according to the voltage value; the state determination module 26 determines the symmetric state of the bidirectional converter based on the current positive sequence component, the current negative sequence component, and the current zero sequence component, or determines the symmetric state of the bidirectional converter based on the voltage positive sequence component, the voltage negative sequence component, and the voltage zero sequence component; the method comprises the steps of calculating an impedance matrix of a three-phase incoming line of the bidirectional converter through analyzing a system schematic diagram, synchronously calculating a voltage value by collecting current values of the three-phase incoming line of the bidirectional converter in real time, calculating a current positive sequence component, a current negative sequence component and a current zero sequence component according to the current values, or calculating a voltage positive sequence component, a voltage negative sequence component and a voltage zero sequence component according to the voltage values, and determining the symmetrical state of the bidirectional converter according to the current positive sequence component, the current negative sequence component and the current zero sequence component, or the voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component so as to identify the symmetrical state of the bidirectional converter in real time, thereby improving the identification precision and the identification efficiency of the symmetrical state and further improving the operation safety and reliability of traction rail transit vehicles.
In one embodiment, the status determination module 26 may be further configured to: the symmetrical state of the bidirectional converter is determined to be asymmetrical if any one of the following conditions is satisfied: the ratio of the current negative sequence component to the current positive sequence component is greater than a preset first ratio threshold; the ratio of the current zero sequence component to the current positive sequence component is greater than a preset second ratio threshold; the current negative sequence component exceeds a preset first limit value range; the zero sequence component of the current exceeds a preset second limit value range; the influence relevance of the higher harmonic component of the bidirectional converter on the current value is larger than a preset relevance threshold.
In one embodiment, the status determination module 26 may be further configured to: the symmetrical state of the bidirectional converter is determined to be asymmetrical if any one of the following conditions is satisfied: the ratio of the negative voltage sequence component to the positive voltage sequence component is greater than a preset third ratio threshold; the ratio of the voltage zero sequence component to the voltage positive sequence component is greater than a preset fourth ratio threshold; the negative sequence component of the voltage exceeds a preset third limit value range; the zero sequence component of the voltage exceeds a preset fourth limit value range; the unbalance rate of the voltage value is larger than a preset balance rate threshold value; the unbalance rate represents the time duty ratio that the difference among the voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component is larger than a preset value; the influence relevance of the higher-order harmonic component of the bidirectional converter on the voltage value is larger than a preset relevance threshold.
In an embodiment, the impedance calculating module 22 may be further configured to: the calculation mode of the impedance matrix of the three-phase incoming line of the bidirectional converter comprises the following steps:
；
wherein the self-impedance is，R S Is the resistance value of the electrical component,L S is the inductance value, the transimpedance of the electrical component>，R M Is the resistance value between the electrical components,L M is the inductive reactance value between the electrical components,iin imaginary units.
In an embodiment, the current collection module 23 may be further configured to: collecting three-phase current values of three-phase incoming lines of the bidirectional converter in real time; and respectively calculating complex current values of the three-phase incoming lines of the bidirectional converter according to the three-phase current values.
In one embodiment, the calculation modes of the positive sequence component, the negative sequence component and the zero sequence component include:
，
，
；
wherein,，iin units of imaginary numbers,AUZ、AUF、AUL、BUZ、BUF、BUL、CUZ、CUF、CULa voltage positive sequence component, a voltage negative sequence component and a voltage zero sequence component of A, B, C three-phase voltage respectively,UU1、UU2、UU3 are voltage values of A, B, C three-phase voltages, respectively.
In an embodiment, the component calculation module 25 may be further configured to: and calculating to obtain a current positive sequence component, a current negative sequence component and a current zero sequence component of the current value according to the modulus value and the argument of the current value.
Next, an electronic device according to an embodiment of the present application is described with reference to fig. 3. The electronic device may be either or both of the first device and the second device, or a stand-alone device independent thereof, which may communicate with the first device and the second device to receive the acquired input signals therefrom.
As shown in fig. 3, the electronic device 10 includes one or more processors 11 and a memory 12.
The processor 11 may be a Central Processing Unit (CPU) or other form of processing unit having data processing and/or instruction execution capabilities, and may control other components in the electronic device 10 to perform desired functions.
Memory 12 may include one or more computer program products that may include various forms of computer-readable storage media, such as volatile memory and/or non-volatile memory. The volatile memory may include, for example, random Access Memory (RAM) and/or cache memory (cache), and the like. The non-volatile memory may include, for example, read Only Memory (ROM), hard disk, flash memory, and the like. One or more computer program instructions may be stored on the computer readable storage medium that can be executed by the processor 11 to implement the methods of the various embodiments of the present application described above and/or other desired functions. Various contents such as an input signal, a signal component, a noise component, and the like may also be stored in the computer-readable storage medium.
In one example, the electronic device 10 may further include: an input device 13 and an output device 14, which are interconnected by a bus system and/or other forms of connection mechanisms (not shown).
When the electronic device is a stand-alone device, the input means 13 may be a communication network connector for receiving the acquired input signals from the first device and the second device.
In addition, the input device 13 may also include, for example, a keyboard, a mouse, and the like.
The output device 14 may output various information to the outside, including the determined distance information, direction information, and the like. The output means 14 may include, for example, a display, speakers, a printer, and a communication network and remote output devices connected thereto, etc.
Of course, only some of the components of the electronic device 10 that are relevant to the present application are shown in fig. 3 for simplicity, components such as buses, input/output interfaces, etc. are omitted. In addition, the electronic device 10 may include any other suitable components depending on the particular application.
The computer program product may write program code for performing the operations of embodiments of the present application in any combination of one or more programming languages, including an object oriented programming language such as Java, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device, partly on a remote computing device, or entirely on the remote computing device or server.
The computer readable storage medium may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium may include, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium would include the following: an electrical connection having one or more wires, a portable disk, a hard disk, random Access Memory (RAM), read-only memory (ROM), pluggable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the application to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.
Claims (10)
1. The three-phase asymmetry monitoring method of the bidirectional converter is applied to a flexible direct current traction power supply system and is characterized by comprising the following steps of:
Acquiring a system schematic diagram of the flexible direct current traction power supply system; wherein the system schematic diagram comprises various electrical elements and connection structures thereof in the flexible direct-current traction power supply system;
according to the system schematic diagram, calculating to obtain an impedance matrix of the three-phase incoming line of the bidirectional converter;
collecting current values of three-phase incoming lines of the bidirectional converter in real time;
based on the impedance matrix and the current value, calculating to obtain a voltage value of a three-phase incoming line of the bidirectional converter;
calculating according to the current value to obtain a current positive sequence component, a current negative sequence component and a current zero sequence component of the current value, or calculating according to the voltage value to obtain a voltage positive sequence component, a voltage negative sequence component and a voltage zero sequence component of the voltage value;
determining a symmetrical state of the bidirectional converter according to the current positive sequence component, the current negative sequence component and the current zero sequence component, or determining a symmetrical state of the bidirectional converter according to the voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component; wherein the symmetrical state of the bidirectional converter comprises symmetry and asymmetry.
2. The bi-directional current transformer three-phase asymmetry monitoring method according to claim 1, wherein the determining the symmetry state of the bi-directional current transformer from the current positive sequence component, the current negative sequence component and the current zero sequence component comprises:
Determining that the symmetrical state of the bidirectional converter is asymmetrical if any one of the following conditions is satisfied:
the ratio of the current negative sequence component to the current positive sequence component is greater than a preset first ratio threshold;
the ratio of the current zero sequence component to the current positive sequence component is greater than a preset second ratio threshold;
the current negative sequence component exceeds a preset first limit value range;
the zero sequence component of the current exceeds a preset second limit value range;
and the influence relevance of the higher-order harmonic component of the bidirectional converter on the current value is greater than a preset relevance threshold.
3. The method of claim 1, wherein determining the symmetry state of the bidirectional converter based on the positive voltage sequence component, the negative voltage sequence component, and the zero voltage sequence component comprises:
determining that the symmetrical state of the bidirectional converter is asymmetrical if any one of the following conditions is satisfied:
the ratio of the negative voltage sequence component to the positive voltage sequence component is greater than a preset third ratio threshold;
the ratio of the voltage zero sequence component to the voltage positive sequence component is greater than a preset fourth ratio threshold;
The negative sequence component of the voltage exceeds a preset third limit value range;
the zero sequence component of the voltage exceeds a preset fourth limit value range;
the unbalance rate of the voltage value is larger than a preset balance rate threshold value; wherein the unbalance rate represents a time duty ratio in which a difference between the voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component is greater than a preset value;
and the influence relevance of the higher-order harmonic component of the bidirectional converter on the voltage value is greater than a preset relevance threshold.
4. A method of monitoring three-phase asymmetry of a bi-directional current transformer according to any of claims 1-3, wherein said calculating an impedance matrix of three-phase incoming lines of the bi-directional current transformer from the system schematic comprises:
the calculation mode of the impedance matrix of the three-phase incoming line of the bidirectional converter comprises the following steps:
；
wherein the self-impedance is，R S Is the resistance value of the electrical component,L S is the inductance value, the transimpedance of the electrical component>，R M Is the resistance value between the electrical components,L M is the inductive reactance value between the electrical components,iin imaginary units.
5. A bi-directional current transformer three-phase asymmetry monitoring method according to any of claims 1-3, wherein the real-time acquisition of current values of three-phase incoming lines of the bi-directional current transformer comprises:
Acquiring three-phase current values of three-phase incoming lines of the bidirectional converter in real time;
and respectively calculating the complex current values of the three-phase incoming lines of the bidirectional converter according to the three-phase current values.
6. A bidirectional converter three-phase asymmetry monitoring method according to any of claims 1-3, characterized in that the calculation of the positive voltage sequence component, the negative voltage sequence component and the zero voltage sequence component comprises:
，
，
；
wherein,，iin units of imaginary numbers,AUZ、AUF、AUL、BUZ、BUF、BUL、CUZ、CUF、CULa voltage positive sequence component, a voltage negative sequence component and a voltage zero sequence component of A, B, C three-phase voltage respectively,UU1、UU2、UU3 are voltage values of A, B, C three-phase voltages, respectively.
7. A bi-directional current transformer three-phase asymmetry monitoring method according to any of claims 1-3, wherein the calculating of the current value from the current value comprises:
and calculating to obtain a current positive sequence component, a current negative sequence component and a current zero sequence component of the current value according to the modulus value and the argument of the current value.
8. The utility model provides a two-way converter three-phase asymmetry monitoring devices, sets up in flexible direct current traction power supply system, its characterized in that includes:
The principle acquisition module is used for acquiring a system principle diagram of the flexible direct-current traction power supply system; wherein the system schematic diagram comprises various electrical elements and connection structures thereof in the flexible direct-current traction power supply system;
the impedance calculation module is used for calculating and obtaining an impedance matrix of the three-phase incoming line of the bidirectional converter according to the system schematic diagram;
the current acquisition module is used for acquiring current values of three-phase incoming lines of the bidirectional converter in real time;
the voltage calculation module is used for calculating and obtaining the voltage value of the three-phase incoming line of the bidirectional converter based on the impedance matrix and the current value;
the component calculation module is used for calculating a current positive sequence component, a current negative sequence component and a current zero sequence component of the current value according to the current value, or calculating a voltage positive sequence component, a voltage negative sequence component and a voltage zero sequence component of the voltage value according to the voltage value;
the state determining module is used for determining the symmetrical state of the bidirectional converter according to the current positive sequence component, the current negative sequence component and the current zero sequence component, or determining the symmetrical state of the bidirectional converter according to the voltage positive sequence component, the voltage negative sequence component and the voltage zero sequence component; wherein the symmetrical state of the bidirectional converter comprises symmetry and asymmetry.
9. A computer readable storage medium, characterized in that the storage medium stores a computer program for executing the method of any of the preceding claims 1-7.
10. An electronic device, comprising:
a processor;
a memory for storing the processor-executable instructions;
the processor is adapted to perform the method of any of the preceding claims 1-7.
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