Converter overvoltage protection monitoring system based on module communication optical fiber

Abstract

The invention discloses a converter overvoltage protection monitoring system based on a module communication optical fiber, relates to the technical field of converter partial pressure regulation, and effectively improves the sensitivity of a monitoring process. According to the method, a multi-section normal linear regression equation and a linear relation equation between the electric field signal frequency spectrums and voltage values are established according to the historical electric field signal frequency spectrums of the current conversion units, and a current conversion monitoring network is established according to the distribution of the current conversion units in the current converter; a historical electric field signal spectrum related to a detection center spectrum is called through a commutation prompt, a plurality of commutation interference-free vectors, commutation interference vectors and interference spectrums corresponding to the commutation interference vectors are generated, the real-time electric field signal spectrum is input into a commutation monitoring network, and whether commutation overload exists in a corresponding commutation unit is judged; and real-time adjustment is carried out according to a judgment result.

Description

Technical Field

[0001] The invention relates to the technical field of converter voltage division regulation, and in particular to a converter overvoltage protection monitoring system based on module communication optical fiber. Background Art

[0002] With the rapid development of power electronics technology, converters are increasingly used in power systems, especially in high-voltage direct current (HVDC) and flexible alternating current transmission systems (FACTS). However, converters may encounter abnormal conditions such as overvoltage during operation, which seriously threatens the safe and stable operation of the system.

[0003] The existing converter overvoltage technology has the following defects:

[0004] Insufficient sensitivity: Some traditional overvoltage protection technologies may not be sensitive enough to instantaneous or short-term overvoltage reactions, and may not be able to detect and respond to sudden overvoltage conditions in a timely manner, thus affecting the safety and stability of the system.

[0005] Slow response speed: The response speed is slow when overvoltage is detected, and effective protection measures cannot be taken immediately after the voltage abnormality occurs. When there are too many monitoring targets, the response speed becomes slow, causing equipment damage or system instability.

[0006] Therefore, how to improve the sensitivity of the monitoring process and the response speed of the monitoring results is a difficulty in the prior art. For this purpose, a converter overvoltage protection monitoring system based on a module communication optical fiber is provided. Summary of the invention

[0007] In order to solve the above technical problems, the object of the present invention is to provide a converter overvoltage protection monitoring system based on module communication optical fiber.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] A converter overvoltage protection monitoring system based on module communication optical fiber includes a cloud computing platform, wherein the cloud computing platform is communicatively connected with an electric field signal acquisition module, an electric field signal analysis module, and a converter status monitoring module;

[0010] The electric field signal acquisition module is used to collect the historical electric field signal spectrum and the real-time electric field signal spectrum generated by the commutation operation performed by each commutation unit in the converter at different initial voltage values ​​through the electric field sensor, and collect the commutation prompt generated by each commutation unit, and bind the commutation prompt with the corresponding electric field signal spectrum;

[0011] The electric field signal analysis module is used to establish a multi-segment normal linear regression equation and a linear relationship equation between the electric field signal spectrum and the voltage value according to the historical electric field signal spectrum of each commutation unit, and at the same time establish a commutation monitoring network according to the distribution of each commutation unit in the converter, and use each historical electric field signal spectrum as the detection center spectrum in turn, and call the historical electric field signal spectrum related to the detection center spectrum through the commutation prompt, and then generate a number of commutation non-interference vectors, commutation interference vectors and interference spectrums corresponding to the commutation interference vectors;

[0012] The converter condition monitoring module is used to input the real-time electric field signal spectrum into the commutation monitoring network, and then mark the detection commutation space node and the interference space node in the flow monitoring network according to the commutation unit associated with the real-time electric field signal spectrum, and retrieve the interference spectrum according to the initial voltage values ​​of the detection commutation space node and the interference space node to de-interfere the real-time electric field signal spectrum. At the same time, the initial voltage value of the detection commutation space node is input into a multi-segment normal linear regression equation to obtain a standard commutation voltage value, and the real-time electric field signal spectrum after de-interference is input into the linear relationship equation between the electric field signal spectrum and the voltage value, so as to judge whether the corresponding commutation unit has commutation overload, and make real-time adjustments according to the judgment result.

[0013] Furthermore, the converter is composed of an input filter, an output filter and a commutation unit;

[0014] The input filter and the output filter are used to reduce the influencing factors of the current entering and outputting the converter;

[0015] The commutation unit is composed of a power semiconductor element, a heat sink, a communication module and a control circuit;

[0016] The communication module is directly connected to the control circuit, and is used to call the control circuit to perform power regulation on the corresponding power semiconductor element according to the power regulation decision from the converter condition monitoring module.

[0017] Furthermore, the acquisition process of the historical electric field signal spectrum and the real-time electric field signal spectrum includes:

[0018] The electric field signal acquisition module sets a number for each communication module. The electric field signal acquisition module installs an electric field sensor in each commutation unit. When any commutation unit performs commutation voltage division, the electric field sensor on the corresponding commutation unit continuously collects the electric field signal generated by the power semiconductor element. At the same time, the communication module in the commutation unit generates a commutation prompt according to the current commutation operation performed by the power semiconductor element and continuously sends it to the communication modules in other commutation units until the commutation unit sends the commutated current to the output filter.

[0019] After the commutation unit performs the commutation operation, the corresponding electric field sensor converts the collected electric field signal into an electric field signal spectrum and sends it to the communication module. At the same time, the communication module collects the initial voltage value when the input filter input current enters the corresponding commutation unit, and the resultant voltage value received by the output filter when the corresponding commutation unit outputs;

[0020] Then the communication module marks the relevant commutation unit number, the initial voltage value and the result voltage value before and after the current commutation on the electric field signal spectrum, and binds the commutation prompts from other communication modules.

[0021] Furthermore, the commutation prompt includes a commutation unit number, a commutation operation, an initial voltage value and a result voltage value, wherein the commutation operation includes converting AC power into DC power or converting DC power into AC power, and the result voltage value is recorded in the commutation prompt when the corresponding commutation operation ends.

[0022] Furthermore, the process of establishing the multi-segment normal linear regression equation and the linear relationship equation between the electric field signal spectrum and the voltage value includes:

[0023] The electric field signal analysis module establishes a three-dimensional coordinate system and a two-dimensional coordinate system, and then classifies each historical electric field signal spectrum according to the commutation operation in the commutation prompt carried by each historical electric field signal spectrum, and then generates a two-dimensional coordinate point according to the initial voltage value and the result voltage value carried by the historical electric field signal spectrum, and maps the two-dimensional coordinate point of the same commutation operation to the two-dimensional coordinate system;

[0024] According to the distribution of each two-dimensional coordinate point, a corresponding linear regression equation is established, and a normal distance threshold is set to obtain the plane space distance between each two-dimensional coordinate point and its corresponding linear regression equation;

[0025] According to the size relationship between the plane space distance and the normal distance threshold, the corresponding two-dimensional coordinate points are eliminated, and then the multi-segment normal linear regression equations corresponding to the two commutation operations are established based on the retained two-dimensional coordinate points. At the same time, the above process of establishing the multi-segment normal linear regression equations corresponding to the two commutation operations is used to obtain the linear relationship equation between the electric field signal spectrum and the voltage value.

[0026] Furthermore, the process of establishing the commutation non-interference vector, the commutation interference vector and the interference spectrum includes:

[0027] Select any coordinate axis in the three-dimensional coordinate system as the commutation time axis, divide a number of time nodes on the commutation time axis, and then use the historical electric field signal spectrum of each commutation unit as the detection center spectrum in turn;

[0028] According to the commutation prompts carried by the historical electric field signal spectrum, the historical electric field signal spectrum with corresponding start and end time nodes and commutation numbers is retrieved;

[0029] According to the distribution of each commutation unit in the converter, a corresponding number of commutation space nodes are established in the plane formed by the 3D coordinate system excluding the commutation time axis, and each commutation space node is labeled with a number according to the commutation unit corresponding to it, and the historical electric field signal spectrum is mapped to the corresponding commutation space node;

[0030] A plurality of commutation voltage threshold intervals are set, and corresponding voltage value labels are marked on corresponding historical electric field signal spectra according to the commutation voltage threshold intervals where the initial voltage values ​​and result voltage values ​​carried by each historical electric field signal spectrum are located;

[0031] Mark the start time node on the commutation time axis according to the start time of the detection center spectrum, and then judge whether the detection center spectrum fluctuates at the corresponding time node according to the start and end time nodes of the commutation prompt carried by the detection center spectrum;

[0032] If there is fluctuation, a commutation interference vector and related interference spectrum binding are established; if there is no fluctuation, a corresponding commutation non-interference vector is established.

[0033] Furthermore, the process of establishing the commutation monitoring network includes:

[0034] According to the process of obtaining the interference spectrum, the commutation non-interference vectors, commutation interference vectors and their corresponding interference spectrums of different groups of voltage value labels at different plane space distances are obtained;

[0035] The commutation space nodes in the three-dimensional coordinate system are extracted to establish a commutation monitoring network, and all commutation non-interference vectors, commutation interference vectors, interference spectra corresponding to the commutation interference vectors, multi-segment normal linear regression equations corresponding to the two commutation operations, and the linear relationship equation between the electric field signal spectrum and the voltage value are input into the commutation monitoring network.

[0036] Furthermore, the process of determining whether the commutation unit has commutation overload includes:

[0037] The real-time electric field signal spectrum of the commutation unit is input into the corresponding commutation space node in the commutation monitoring network and recorded as the monitoring commutation space node; according to the commutation prompt bound to the real-time electric field signal spectrum, the corresponding commutation space node is found and marked as the interference commutation space node;

[0038] According to the commutation voltage threshold interval where the initial voltage values ​​of the monitoring commutation space node and the interfering commutation space node are located, setting voltage value labels for the monitoring commutation space node and the interfering commutation space node;

[0039] Then, according to the plane space distance between the monitoring commutation space node and the interfering commutation space node and the voltage value label carried, the corresponding commutation non-interference vector or commutation interference vector is retrieved;

[0040] If it is a commutation non-interference vector, the corresponding interference commutation space node will be marked;

[0041] If it is a commutation interference vector, the corresponding time node segment in the spectrum of the real-time electric field signal is de-interfered by calling the corresponding interference spectrum;

[0042] The real-time electric field signal spectrum after interference removal is input into the linear relationship equation between the electric field signal spectrum and the voltage value, and then the real-time commutation voltage value of the monitoring commutation space node is determined;

[0043] Inputting the initial voltage value of the monitored commutation space node into the corresponding commutation operation multi-segment normal linear regression equation, thereby obtaining the standard commutation voltage value of the monitored commutation space node;

[0044] According to the size relationship between the standard commutation voltage value and the real-time commutation voltage value, it is judged that the commutation unit has commutation overload, and then the corresponding commutation unit is adjusted by voltage division.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] The present invention establishes a multi-segment normal linear regression equation and a linear relationship equation between the electric field signal spectrum and the voltage value according to the historical electric field signal spectrum of each commutation unit, and at the same time establishes a commutation monitoring network according to the distribution of each commutation unit in the converter, takes each historical electric field signal spectrum as the detection center spectrum in turn, and retrieves the historical electric field signal spectrum related to the detection center spectrum through the commutation prompt, thereby generating a number of commutation non-interference vectors, commutation interference vectors and interference spectra corresponding to the commutation interference vectors, inputs the real-time electric field signal spectrum into the commutation monitoring network, and then determines whether the corresponding commutation unit has commutation overload, and performs real-time adjustment according to the determination result, thereby improving the sensitivity of the monitoring process while improving the response speed of the monitoring result. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention.

[0048] Figure 1 It is a schematic diagram of the present invention. DETAILED DESCRIPTION

[0049] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0050] like Figure 1 As shown, a converter overvoltage protection monitoring system based on module communication optical fiber includes a cloud computing platform and a converter, wherein the cloud computing platform is communicatively connected with an electric field signal acquisition module, an electric field signal analysis module, and a converter status monitoring module;

[0051] The inverter is composed of an input filter, an output filter and a plurality of inverter units, wherein the inverter unit is composed of a power semiconductor element, a heat sink, a communication module and a control circuit;

[0052] The electric field signal acquisition module is used to collect the historical electric field signal spectrum and the real-time electric field signal spectrum generated by the commutation operation performed by each commutation unit in the converter at different initial voltage values ​​through the electric field sensor, and collect the commutation prompts generated by each communication module, and bind the commutation prompts with the corresponding electric field signal spectrum;

[0053] The electric field signal analysis module is used to establish a multi-segment normal linear regression equation and a linear relationship equation between the electric field signal spectrum and the voltage value according to the historical electric field signal spectrum of each commutation unit, and at the same time establish a commutation monitoring network according to the distribution of each commutation unit in the converter, and use each historical electric field signal spectrum as the detection center spectrum in turn, and call the historical electric field signal spectrum related to the detection center spectrum through the commutation prompt, and then generate a number of commutation non-interference vectors, commutation interference vectors and interference spectrums corresponding to the commutation interference vectors;

[0054] The converter condition monitoring module is used to input the real-time electric field signal spectrum into the commutation monitoring network, and then mark the detection commutation space node and the interference space node in the flow monitoring network according to the commutation unit associated with the real-time electric field signal spectrum, and retrieve the corresponding commutation non-interference vector or commutation interference vector according to the initial voltage values ​​of the detection commutation space node and the interference space node, and then de-interfere the real-time electric field signal spectrum through the interference spectrum, and at the same time input the initial voltage value of the detection commutation space node into the multi-segment normal linear regression equation to obtain the standard commutation voltage value, and input the real-time electric field signal spectrum after de-interference into the linear relationship equation between the electric field signal spectrum and the voltage value, so as to judge whether the corresponding commutation unit has commutation overload, and make real-time adjustments according to the judgment result.

[0055] Further, the working principle of the present invention is described below by way of examples:

[0056] The converter is composed of an input filter, an output filter and Num commutation units;

[0057] The input filter and the output filter are used to reduce the influencing factors such as harmonics during the process of current entering and outputting the converter;

[0058] The commutation unit is divided into a reverse flow unit and a rectifier unit, which are respectively composed of a power semiconductor element, a heat sink, a communication module and a control circuit;

[0059] The power semiconductor element is used to convert alternating current into direct current or convert direct current into alternating current;

[0060] The communication module is directly connected to the control circuit, and is used to call the control circuit to perform power regulation on the corresponding power semiconductor element according to the power regulation decision from the converter condition monitoring module.

[0061] Furthermore, the communication modules in each commutation unit are connected to the electric field signal acquisition module for communication, and then the electric field signal acquisition module sets numbers s1, s2, s3, ..., s Num , where Num is a natural number greater than 0;

[0062] The electric field signal acquisition module installs an electric field sensor in each commutation unit. When any commutation unit performs commutation voltage division, the electric field sensor on the corresponding commutation unit continuously collects the electric field signal generated by the power semiconductor element. At the same time, the communication module in the commutation unit generates a commutation prompt according to the current commutation operation performed by the power semiconductor element and continuously sends it to the communication modules in other commutation units until the commutation unit sends the commutated current to the output filter.

[0063] It should be noted that the commutation prompt includes the commutation unit number, commutation operation, initial voltage value and result voltage value, wherein the commutation operation includes conversion of AC into DC or DC into AC, and the result voltage value is recorded in the commutation prompt when the corresponding commutation operation is completed;

[0064] After the commutation unit performs the commutation operation, the corresponding electric field sensor converts the collected electric field signal into an electric field signal spectrum and sends it to the communication module. At the same time, the communication module collects the initial voltage value when the input filter input current enters the corresponding commutation unit, and the resultant voltage value received by the output filter when the corresponding commutation unit outputs;

[0065] Then the communication module marks the relevant commutation unit number, the initial voltage value and the result voltage value before and after the current commutation on the electric field signal spectrum, and binds the commutation prompts from other communication modules;

[0066] It should be noted that, in the process of the commutation unit corresponding to the communication module performing the commutation operation, the communication module continuously receives commutation prompts from other communication modules. When the commutation unit corresponding to the communication module has not yet completed the commutation operation, when any commutation prompt received by it stops, the communication module marks the start and end time nodes of the commutation prompt received; or when the commutation unit corresponding to the communication module has completed the commutation operation, if there is a commutation prompt that has not stopped, the corresponding commutation prompt is marked with the start and end time nodes according to the received time node and the time node when the commutation unit has completed the commutation operation;

[0067] Then, the electric field signal acquisition module acquires the real-time electric field signal spectrum of each commutation unit and several historical electric field signal spectrums according to the above-mentioned acquisition of the electric power signal spectrum;

[0068] The electric field signal acquisition module sends all historical electric field signal spectra to the electric field signal analysis module, and sends the real-time electric field signal spectrum of each commutation unit to the converter status monitoring module.

[0069] Furthermore, the electric field signal analysis module establishes a three-dimensional coordinate system and a two-dimensional coordinate system, and then classifies each historical electric field signal spectrum according to the commutation operation in the commutation prompt carried by each historical electric field signal spectrum, and then generates a two-dimensional coordinate point according to the initial voltage value and the result voltage value carried by the historical electric field signal spectrum, and maps the two-dimensional coordinate point of the same commutation operation to the two-dimensional coordinate system;

[0070] According to the distribution of each two-dimensional coordinate point, a corresponding linear regression equation is established, and a normal distance threshold is set to obtain the plane space distance between each two-dimensional coordinate point and its corresponding linear regression equation;

[0071] If the plane space distance between a two-dimensional coordinate point and its corresponding linear regression equation is greater than or equal to the normal distance threshold, the corresponding two-dimensional coordinate point is eliminated;

[0072] If the plane space distance between a two-dimensional coordinate point and its corresponding linear regression equation is less than the normal distance threshold, the corresponding two-dimensional coordinate point is retained;

[0073] Then, a multi-segment normal linear regression equation corresponding to the two commutation operations is established according to the retained two-dimensional coordinate points. At the same time, the linear relationship equation between the electric field signal spectrum and the voltage value is obtained by adopting the above process of establishing the multi-segment normal linear regression equation corresponding to the two commutation operations.

[0074] Furthermore, any coordinate axis in the three-dimensional coordinate system is selected as the commutation time axis, and a number of time nodes are divided on the commutation time axis, and then the historical electric field signal spectrum of each commutation unit is used as the detection center spectrum in turn;

[0075] According to the commutation prompts carried by the historical electric field signal spectrum, the historical electric field signal spectrum with corresponding start and end time nodes and commutation numbers is retrieved;

[0076] According to the distribution of each commutation unit in the converter, a corresponding number of commutation space nodes are established in the plane formed by the 3D coordinate system excluding the commutation time axis, and each commutation space node is labeled with a number according to the commutation unit corresponding to it, and the historical electric field signal spectrum is mapped to the corresponding commutation space node;

[0077] A plurality of commutation voltage threshold intervals are set, and corresponding voltage value labels are marked on corresponding historical electric field signal spectra according to the commutation voltage threshold intervals where the initial voltage values ​​and result voltage values ​​carried by each historical electric field signal spectrum are located;

[0078] According to the signal fluctuation time of the detection center spectrum, the start and end time nodes of each commutation prompt and the location of the corresponding commutation space node, the interference spectrum generated by the commutation space node on the detection center spectrum under different groups of voltage value labels and spatial distances is obtained;

[0079] The interference spectrum acquisition process includes:

[0080] Mark the start time node on the commutation time axis according to the start time of the detection center spectrum, and then judge whether the detection center spectrum fluctuates at the corresponding time node according to the start and end time nodes of the commutation prompt carried by the detection center spectrum;

[0081] If there is fluctuation, the detection center spectrum will subtract the spectrum part without fluctuation from the start and end time nodes of the fluctuation, and record this spectrum part as the interference spectrum. At the same time, according to the plane coordinate points of the commutation space nodes corresponding to the detection center spectrum and the commutation space nodes corresponding to the commutation prompt, establish the corresponding commutation interference vector, and mark the starting and ending positions of the commutation interference vector with corresponding voltage value labels, so as to bind the commutation interference vector to the corresponding interference spectrum.

[0082] It should be noted that, if it is determined according to the commutation prompt that there are two historical electric field signal spectra at the same time node that interfere with the detection center spectrum, then the corresponding commutation interference vector and interference spectrum are generated according to the composition of any one of the above two historical electric field signal spectra existing alone in other detection center spectra and having the same initial voltage value;

[0083] The end point coordinates of the commutation interference vector are the commutation space nodes corresponding to the detection center spectrum, and the starting point coordinates are the commutation space nodes corresponding to the commutation prompt;

[0084] If there is no fluctuation, the corresponding commutation non-interference vector is directly established according to the commutation space node corresponding to the detection center spectrum and the plane coordinate point of the commutation space node corresponding to the commutation prompt and the corresponding voltage value label.

[0085] Furthermore, according to the process of obtaining the interference spectrum, the commutation non-interference vectors, commutation interference vectors and their corresponding interference spectrums of different groups of voltage value labels at different plane space distances are obtained;

[0086] The commutation space nodes in the three-dimensional coordinate system are extracted to establish a commutation monitoring network, and all commutation non-interference vectors, commutation interference vectors, interference spectra corresponding to the commutation interference vectors, multi-segment normal linear regression equations corresponding to the two commutation operations, and the linear relationship equation between the electric field signal spectrum and the voltage value are input into the commutation monitoring network. Then the electric field signal analysis module sends the commutation monitoring network to the converter condition monitoring module.

[0087] Furthermore, the converter condition monitoring module inputs the real-time electric field signal spectrum of each commutation unit into the corresponding commutation space node in the commutation monitoring network and records it as the monitoring commutation space node, and according to the commutation prompt bound to the real-time electric field signal spectrum, finds the corresponding commutation space node in the commutation monitoring network and marks it as the interference commutation space node, and at the same time marks the commutation voltage value and the start and end time nodes in the commutation prompt on the interference commutation space node;

[0088] According to the initial voltage value of the interfering commutation space node corresponding to the initial voltage value of the monitoring commutation space node and the commutation voltage threshold interval where the result voltage value is located, corresponding voltage value labels are set for the monitoring commutation space node and the interfering commutation space node;

[0089] Then, according to the plane space distance between the monitoring commutation space node and the interfering commutation space node and the voltage value label carried, the corresponding commutation non-interference vector or commutation interference vector is retrieved;

[0090] If it is a commutation non-interference vector, the corresponding interference commutation space node will be marked;

[0091] If it is a commutation interference vector, then according to the start and end time nodes in the commutation prompt of the corresponding interfering commutation space node and the interference spectrum bound to the commutation interference vector, the corresponding time node segment in the real-time electric field signal spectrum of the monitoring commutation space node is de-interfered;

[0092] The real-time electric field signal spectrum after interference removal is input into the linear relationship equation between the electric field signal spectrum and the voltage value, and then the real-time commutation voltage value of the monitoring commutation space node is determined;

[0093] Inputting the initial voltage value of the monitored commutation space node into the corresponding commutation operation multi-segment normal linear regression equation, thereby obtaining the standard commutation voltage value of the monitored commutation space node;

[0094] If the standard commutation voltage value is greater than or equal to the real-time commutation voltage value, no operation is performed;

[0095] If the standard commutation voltage value is less than the real-time commutation voltage value, it is determined that the corresponding commutation unit has a commutation overload, and then it is determined whether the commutation unit is not working at present. If so, a commutation voltage division decision is generated for the commutation unit not working.

[0096] If it does not exist, the commutation operation of the current commutation unit is suspended until there is an inoperative commutation unit;

[0097] It should be noted that, if after the commutation voltage division decision is executed, the commutation unit corresponding to the monitored commutation space node still has commutation overload, it is determined again whether the commutation unit is not working, until the commutation unit corresponding to the monitored commutation space node does not have commutation overload;

[0098] The converter status monitoring module sends the commutation voltage division decision to the communication module of the corresponding commutation unit, and then the communication module mobilizes the control circuit to execute the commutation voltage division decision until the real-time commutation voltage value of the corresponding commutation unit is less than or equal to the standard commutation voltage value.

[0099] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. Converter overvoltage protection monitoring system based on module communication optical fiber, including cloud computing platform, It is characterized in that The cloud computing platform is communicatively connected to an electric field signal acquisition module, an electric field signal analysis module, and a converter status monitoring module; The electric field signal acquisition module is used to collect the historical electric field signal spectrum and the real-time electric field signal spectrum generated by the commutation operation performed by each commutation unit in the converter at different initial voltage values ​​through the electric field sensor, and collect the commutation prompt generated by each commutation unit, and bind the commutation prompt with the corresponding electric field signal spectrum; The electric field signal analysis module is used to establish a multi-segment normal linear regression equation and a linear relationship equation between the electric field signal spectrum and the voltage value according to the historical electric field signal spectrum of each commutation unit, and at the same time establish a commutation monitoring network according to the distribution of each commutation unit in the converter, and use each historical electric field signal spectrum as the detection center spectrum in turn, and call the historical electric field signal spectrum related to the detection center spectrum through the commutation prompt, and then generate a number of commutation non-interference vectors, commutation interference vectors and interference spectrums corresponding to the commutation interference vectors; The converter condition monitoring module is used to input the real-time electric field signal spectrum into the commutation monitoring network, and then mark the detection commutation space node and the interference space node in the flow monitoring network according to the commutation unit associated with the real-time electric field signal spectrum, and retrieve the interference spectrum according to the initial voltage values ​​of the detection commutation space node and the interference space node to de-interfere the real-time electric field signal spectrum. At the same time, the initial voltage value of the detection commutation space node is input into a multi-segment normal linear regression equation to obtain a standard commutation voltage value, and the real-time electric field signal spectrum after de-interference is input into the linear relationship equation between the electric field signal spectrum and the voltage value, so as to judge whether the corresponding commutation unit has commutation overload, and make real-time adjustments according to the judgment result.

2. The converter overvoltage protection monitoring system based on modular communication optical fiber according to claim 1, It is characterized in that The converter is composed of an input filter, an output filter and a commutation unit; The input filter and the output filter are used to reduce the influencing factors of the current entering and outputting the converter; The commutation unit is composed of a power semiconductor element, a heat sink, a communication module and a control circuit; The communication module is directly connected to the control circuit, and is used to call the control circuit to perform power regulation on the corresponding power semiconductor element according to the power regulation decision from the converter condition monitoring module.

3. The converter overvoltage protection monitoring system based on modular communication optical fiber according to claim 2, It is characterized in that The acquisition process of the historical electric field signal spectrum and the real-time electric field signal spectrum includes: Each communication module is numbered, and the electric field signal acquisition module installs an electric field sensor in each commutation unit. When any commutation unit performs commutation voltage division, the electric field sensor continuously collects the electric field signal generated by the power semiconductor element. At the same time, the communication module generates a commutation prompt according to the current commutation operation performed by the power semiconductor element and continuously sends it to the communication modules in other commutation units. After the commutation unit performs the commutation operation, the corresponding electric field sensor converts the collected electric field signal into an electric field signal spectrum and sends it to the communication module. At the same time, the communication module collects the initial voltage value when the input filter input current enters the corresponding commutation unit, and the resultant voltage value received by the output filter when the corresponding commutation unit outputs; Then the communication module marks the relevant commutation unit number, the initial voltage value and the result voltage value before and after the current commutation on the electric field signal spectrum, and binds the commutation prompts from other communication modules.

4. The converter overvoltage protection monitoring system based on modular communication optical fiber according to claim 3, It is characterized in that The commutation prompt includes a commutation unit number, a commutation operation, an initial voltage value and a result voltage value, wherein the commutation operation includes converting AC power into DC power or converting DC power into AC power, and the result voltage value is recorded in the commutation prompt when the corresponding commutation operation ends.

5. The converter overvoltage protection monitoring system based on modular communication optical fiber according to claim 4, It is characterized in that The process of establishing the multi-segment normal linear regression equation and the linear relationship equation between the electric field signal spectrum and the voltage value includes: Establish a three-dimensional coordinate system and a two-dimensional coordinate system, classify each historical electric field signal spectrum according to the commutation operation, and then generate a two-dimensional coordinate point according to the initial voltage value and the result voltage value of the historical electric field signal spectrum, and map the two-dimensional coordinate point of the same commutation operation to the two-dimensional coordinate system; According to the distribution of each two-dimensional coordinate point, a corresponding linear regression equation is established, and a normal distance threshold is set to obtain the plane space distance between each two-dimensional coordinate point and its corresponding linear regression equation; According to the size relationship between the plane space distance and the normal distance threshold, the corresponding two-dimensional coordinate points are eliminated, and then the multi-segment normal linear regression equations corresponding to the two commutation operations are established based on the retained two-dimensional coordinate points. At the same time, the above process of establishing the multi-segment normal linear regression equations corresponding to the two commutation operations is used to obtain the linear relationship equation between the electric field signal spectrum and the voltage value.

6. The converter overvoltage protection monitoring system based on modular communication optical fiber according to claim 5, It is characterized in that The process of establishing the commutation non-interference vector, the commutation interference vector and the interference spectrum includes: A coordinate axis in the three-dimensional coordinate system is selected as a commutation time axis, a plurality of time nodes are divided on the commutation time axis, and the historical electric field signal spectrum of each commutation unit is used as the detection center spectrum in turn; According to the commutation prompts carried by the historical electric field signal spectrum, the historical electric field signal spectrum with corresponding start and end time nodes and commutation numbers is retrieved; According to the distribution of each commutation unit in the converter, a corresponding number of commutation space nodes are established in the plane formed by the 3D coordinate system excluding the commutation time axis, and each commutation space node is labeled with a number according to the commutation unit corresponding to it, and the historical electric field signal spectrum is mapped to the corresponding commutation space node; A plurality of commutation voltage threshold intervals are set, and corresponding voltage value labels are marked on corresponding historical electric field signal spectra according to the commutation voltage threshold intervals where the initial voltage values ​​and result voltage values ​​carried by each historical electric field signal spectrum are located; Mark the start time node on the commutation time axis according to the start time of the detection center spectrum, and then judge whether the detection center spectrum fluctuates at the corresponding time node according to the start and end time nodes of the commutation prompt carried by the detection center spectrum; If there is fluctuation, a commutation interference vector and related interference spectrum binding are established; if there is no fluctuation, a corresponding commutation non-interference vector is established.

7. The converter overvoltage protection monitoring system based on modular communication optical fiber according to claim 6, It is characterized in that The establishment process of the commutation monitoring network includes: According to the process of obtaining the interference spectrum, the commutation non-interference vectors, commutation interference vectors and their corresponding interference spectrums of different groups of voltage value labels at different plane space distances are obtained; The commutation space nodes in the three-dimensional coordinate system are extracted to establish a commutation monitoring network, and all commutation non-interference vectors, commutation interference vectors, interference spectra corresponding to the commutation interference vectors, multi-segment normal linear regression equations corresponding to the two commutation operations, and the linear relationship equation between the electric field signal spectrum and the voltage value are input into the commutation monitoring network.

8. The converter overvoltage protection monitoring system based on modular communication optical fiber according to claim 7, It is characterized in that The process of determining whether the commutation unit has commutation overload includes: The real-time electric field signal spectrum of the commutation unit is input into the corresponding commutation space node in the commutation monitoring network and recorded as the monitoring commutation space node; according to the commutation prompt bound to the real-time electric field signal spectrum, the corresponding commutation space node is found and marked as the interference commutation space node; According to the commutation voltage threshold interval where the initial voltage values ​​of the monitoring commutation space node and the interfering commutation space node are located, setting voltage value labels for the monitoring commutation space node and the interfering commutation space node; Then, according to the plane space distance between the monitoring commutation space node and the interfering commutation space node and the voltage value label carried, the corresponding commutation non-interference vector or commutation interference vector is retrieved; If it is a commutation non-interference vector, the corresponding interference commutation space node will be marked; If it is a commutation interference vector, the corresponding time node segment in the spectrum of the real-time electric field signal is de-interfered by calling the corresponding interference spectrum; The real-time electric field signal spectrum after interference removal is input into the linear relationship equation between the electric field signal spectrum and the voltage value, and then the real-time commutation voltage value of the monitoring commutation space node is determined; Inputting the initial voltage value of the monitored commutation space node into the corresponding commutation operation multi-segment normal linear regression equation, thereby obtaining the standard commutation voltage value of the monitored commutation space node; According to the size relationship between the standard commutation voltage value and the real-time commutation voltage value, it is judged that the commutation unit has commutation overload, and then the corresponding commutation unit is adjusted by voltage division.

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