An offshore wind power converter output voltage intelligent modulation control system and method

Abstract

The application discloses an offshore wind power converter output voltage intelligent modulation control system and method, and belongs to the electrical control technical field.The system comprises a wind power equipment management module, a data acquisition module, a storage database, a model analysis module and an intelligent modulation control module; the wind power equipment management module is used for transmitting the electric energy generated by a wind turbine generator set to a parallel converter to be converted into the form of electric energy and then being connected to a power grid; the data acquisition module is used for acquiring power generation data and converter parameter data; the storage database is used for storing historical data; the model analysis module is used for analyzing the influence of different output voltages on the operation efficiency of the converter and the probability of equipment failure under different converter loss risk values; and the intelligent modulation control module is used for adaptively modulating the output voltages between the converters; and the application maximizes the safety and operation efficiency in the electric energy conversion process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical control, in particular to a kind of offshore wind power converter output voltage intelligent modulation control system and method. BACKGROUND

[0002] Converter is realized as the power electronic core device of form transformation and control, and its output voltage waveform quality directly determines the performance, efficiency and compatibility between the entire power electronic conversion system and power grid;In offshore wind power generation, in the face of harsh sea environment, equipment usually appears aging and parameter fluctuation, through intelligent modulation control adaptive adjustment system parameter, not only can significantly improve the operation reliability of converter under extreme conditions, but also can effectively inhibit the resonance risk caused by the interaction of sea cable capacitance and grid impedance, ensure that electric energy is safely and efficiently merged into main grid.

[0003] Traditional pulse width modulation technology has been widely applied and laid the foundation of modulation, but in the face of increasingly complex application scenarios, especially in the control of parallel type converter under multiple working conditions, the system is often difficult to meet the needs of high efficiency and high reliability at the same time, and the difference in load distribution and device aging degree of each module converter will also lead to uneven power distribution of output voltage, which not only reduces the overall coordination efficiency of the system, but also accelerates the continuous aging of power devices;When there is a single module converter failure, the existing technology cannot meet the rapid response of multiple converters to maximize power transmission, which aggravates the instability of power grid. SUMMARY

[0004] The purpose of the present application is to provide a kind of offshore wind power converter output voltage intelligent modulation control system and method to solve the problems raised in the above background.

[0005] In order to solve the above technical problems, the present application provides the following technical scheme: a kind of offshore wind power converter output voltage intelligent modulation control method, the method comprises the following steps:

[0006] Step S1, the electric energy generated by wind turbine generator unit wind power generation is transmitted to parallel type converter for electric energy form conversion;The wind turbine generator unit contains several wind power generators;The parallel type converter contains several converters;

[0007] Step S2, collect power generation data and conversion parameter data in the process of electric energy transmission in step S1;The power generation data includes the power generation of different wind power generators;The conversion parameter data includes the number of converters participating in electric energy form conversion, the packaging volume of different converters, the current and voltage change of input and output terminals of different converters;

[0008] Step S3, store the collected variable flow parameter data as historical data in the storage database; based on the historical data stored in the storage database, establish a power conversion analysis model to analyze the influence of different output voltages on the operation efficiency of the variable flow converter and the probability of equipment failure under different variable flow converter loss risk values;

[0009] Step S4, according to the collected power generation data, determine the required transmission power of the input end of the parallel variable flow converter at the next moment, and according to the power conversion analysis model established in step S3, adaptively modulate the output voltages between the variable flow converters, and integrate the converted electric energy into the power grid.

[0010] An offshore wind power variable flow converter output voltage intelligent modulation control system, the system comprises a wind power equipment management module, a data acquisition module, a storage database, a model analysis module and an intelligent modulation control module;

[0011] The wind power equipment management module is used for transmitting the electric energy generated by the wind turbine generator to the parallel variable flow converter for form conversion and then integrating into the power grid; the wind turbine generator comprises a plurality of wind power generators; the parallel variable flow converter comprises a plurality of variable flow converters;

[0012] The data acquisition module is used for collecting power generation data and variable flow parameter data in the process of electric energy transmission in the wind power equipment management module; the power generation data comprises the power generation of different wind power generators; the variable flow parameter data comprises the number of variable flow converters participating in the form conversion, the packaging volume of different variable flow converters, and the current and voltage changes of the input and output ends of different variable flow converters; the collected power generation data is sent to the intelligent modulation control module, and the collected variable flow parameter data is sent to the storage database;

[0013] The storage database is used for storing the variable flow parameter data collected by the data acquisition module as historical data;

[0014] The model analysis module is used for establishing a power conversion analysis model based on the historical data stored in the storage database, analyzing the influence of different output voltages on the operation efficiency of the variable flow converter, and analyzing the probability of equipment failure under different variable flow converter loss risk values;

[0015] The intelligent modulation control module is used for determining the required transmission power of the input end of the parallel variable flow converter at the next moment according to the collected power generation data, adaptively modulating the output voltages between the variable flow converters according to the power conversion analysis model established in the model analysis module, and sending the output voltage modulation signals between the variable flow converters to the wind power equipment management module.

[0016] Compared with the prior art, the present application has the beneficial effects that: by establishing the power conversion analysis model, analyzing the influence of different output voltages on the operation efficiency of the converter, the power conversion efficiency of the system can be effectively improved; by analyzing the probability of equipment failure under different converter loss risk values, the converter failure can be effectively predicted in advance, and the safety of the system in the power conversion process is improved; by modulating and controlling the output voltages of each converter at the next moment, not only the power loss in the power conversion process of the parallel converter is considered, but also the safety risk occurring in the output voltage modulation process between each converter is considered, so that the system simultaneously considers the safety and maximizes the operation efficiency in the power conversion process. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic diagram of an offshore wind power converter output voltage intelligent modulation control system of the present application. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0019] The present application provides technical solutions:

[0020] In the present embodiment one: a kind of offshore wind power converter output voltage intelligent modulation control method is provided, and the method comprises the following steps:

[0021] Step S1, the electric energy generated by wind turbine generator unit wind power generation is transmitted to parallel converter for power form conversion;The wind turbine generator unit contains several wind power generators;The parallel converter contains several converters.

[0022] Further, the several wind power generators are distributed in different areas on the sea, and are connected to the several converters through respective independent machine-side rectifier units and a common DC bus, and finally are connected to the power grid after power form conversion by the several converters;The converter is of the same type;Wherein, the operation of each converter does not interfere with each other, when there is a device failure of the converter, the faulty converter is isolated, and the output voltage of the other converters is recombined.

[0023] Step S2, collecting power generation data and converter parameter data in the power transmission process in step S1; the power generation data includes power generation of different wind power generators; the converter parameter data includes number of converters participating in power form conversion, packaging volume of different converters, current and voltage changes of input and output ends of different converters.

[0024] It should be noted that the converter input end represents the port that needs to be input to the converter for output voltage modulation after the electric energy of several wind power generators is merged into the common DC bus; the converter output end represents the port that is output to the power grid after the output voltage is modulated by the converter.

[0025] Step S3, storing the collected converter parameter data as historical data in a storage database; based on the historical data stored in the storage database, establishing a power conversion analysis model to analyze the influence of different output voltages on the operation efficiency of the converter and the probability of equipment failure under different converter loss risk values.

[0026] Specifically, the method steps are as follows:

[0027] Step S31, retrieving historical converter parameter data from the storage database for analysis, determining the number of converters in the parallel converter , and determining the packaging volume of each converter , according to the current and voltage of the input end and the output end of each converter at different times , determining the input power and the output power of each converter at different times ;

[0028] Step S32, establishing a power conversion analysis model, according to and , determining the power conversion efficiency of each converter at different times ; taking the voltage of the converter output end as the independent variable and the power conversion efficiency of the converter as the dependent variable, analyzing the influence of different output voltages on the operation efficiency of the converter:

[0029] ;

[0030] Among them, represents the highest power conversion efficiency of the converter; represents the opening coefficient; represents the central output voltage when the converter has the highest power conversion efficiency;

[0031] Step S33, select historical converter parameter data where the converter fails to analyze, calculate the loss risk value of different converters when the equipment fails according to the packaging volume of the converter, the input power and the output power of the converter . represents the number of converters analyzed that fail equipment; according to the loss risk value of each converter when the equipment fails, a weibull distribution is used to analyze the probability of the converter failing equipment under different loss risk values, to obtain a curve function about the loss risk value and the probability of converter equipment failure . .

[0032] It should be noted that when the voltage at the output end of the converter is too high, the additional loss increases due to the increase in capacitor voltage stress, and the operating efficiency of the converter decreases; when the voltage at the output end of the converter is too low, the conduction loss of the device increases, and the operating efficiency of the converter also decreases.

[0033] It should be noted that the effect of different output voltages on the operating efficiency of the converter is analyzed, the voltage at the output end of the same converter at different times is taken as the training parameter of , the corresponding is taken as the training parameter of , and according to the least squares method, it is substituted into to fit to determine the size of , and .

[0034] It should be noted that the converter equipment failure represents a short circuit or open circuit of the converter.

[0035] In this embodiment, the formula for calculating the loss risk value of different converters when the equipment fails is : ; wherein represents the loss risk value of the th converter when the equipment fails; represents the input power of the th converter that fails equipment at different times ; represents the output power of the th converter that fails equipment at different times ; represents the packaging volume of the th converter; The lower limit of the integral is the time stamp when the converter first operates, and the upper limit of the integral is the time stamp when the converter fails equipment.

[0036] In the embodiment, the method for determining the curve function is to determine a shape parameter of a trend of the device failure in the converter with the loss risk value : ; determine a scale parameter of the average loss risk value before the device failure in the converter : ; according to the shape parameter and the scale parameter , analyze the probability of the device failure in the converter under different loss risk values by using the weibull distribution: ; wherein, represents the loss risk value when the device failure in the converter is analyzed; represents the average value of the loss risk value when the device failure in the converter is analyzed in the historical converter parameter data ; and represents the probability of the device failure in the converter.

[0037] It should be noted that by establishing the power conversion analysis model, the influence of different output voltages on the operation efficiency of the converter is analyzed, the output voltage of each converter in the parallel converter is dynamically adjusted, and thus the power conversion efficiency of the system is improved; the probability of the device failure under different loss risk values of the converter is analyzed, the converter failure is effectively predicted in advance, and the safety in the power conversion process of the system is improved.

[0038] Step S4, according to the collected power generation data, determine the required transmission power of the input end of the parallel converter at the next moment, and according to the power conversion analysis model established in step S3, adaptively modulate the output voltage between the converters, and combine the converted electric energy into the power grid.

[0039] Specifically, the method steps are:

[0040] Step S41, analyze the collected power generation data, determine the required transmission power of the input end of the parallel converter at the next moment according to the power generation of different wind driven generators;

[0041] Step S42, according to the current and voltage changes of the input end and the output end of each converter, determine the loss risk value of each converter when the device failure occurs ; according to the power conversion analysis model established in step S3, determine the output voltage between the converters at the next moment , so as to satisfy the condition formula:

[0042] ;

[0043] wherein, represent the optimal working state of the parallel type converter; represent the input power of the th converter at the next moment, and ; represent the power conversion efficiency of the converter when the output voltage is ; represent the loss risk value when the current th converter has a device failure; represent the packaging volume of the th converter; represent the output voltage of the th converter at the next moment, which is determined according to ; represent the influence weight of the power loss in the power conversion process of the parallel type converter; represent the influence weight of the device failure probability in the power conversion process of the parallel type converter;

[0044] Step S43, after the output voltage between the converters at the next moment is modulated and controlled according to , the converted electric energy is merged into the power grid.

[0045] In the embodiment, is determined according to the formula .

[0046] It should be noted that the influence weight values and are limited, and the output voltage between the converters at the next moment is modulated and controlled, which not only considers the power loss in the power conversion process of the parallel type converter , but also considers the safety risk in the output voltage modulation process between the converters In the embodiment, the value of is taken, and the value of is taken, so that the system simultaneously considers the safety and the maximum operation efficiency in the power conversion process.

[0047] In the embodiment, the parallel type converter is monitored for safety, when there is a device failure of the converter, the faulty converter is isolated at this time, a device failure signal is sent to the management personnel, and the output voltage of the other converters is recombined, adjusted , , and steps S41-S43 are executed, so as to minimize the failure risk until the management personnel completes the maintenance.

[0048] Further, the interactive display platform is provided, and the manager can view the historical variable flow parameter data in the storage database and the device failure probability of each variable flow through the interactive display platform, so that the manager can conveniently perform further maintenance operation.

[0049] Please refer to Figure 1 In the second embodiment, an offshore wind power variable flow output voltage intelligent modulation control system is provided, which comprises a wind power equipment management module, a data acquisition module, a storage database, a model analysis module and an intelligent modulation control module.

[0050] The wind power equipment management module is used for transmitting the electric energy generated by the wind turbine generator to the parallel variable flow for form conversion and then connecting to the power grid; the wind turbine generator comprises a plurality of wind power generators; and the parallel variable flow comprises a plurality of variable flows.

[0051] The data acquisition module is used for acquiring the power generation data and variable flow parameter data in the electric energy transmission process of the wind power equipment management module; the power generation data comprises the power generation of different wind power generators; the variable flow parameter data comprises the number of variable flows participating in the form conversion, the packaging volume of different variable flows, and the current and voltage changes of the input and output ends of different variable flows; the acquired power generation data is sent to the intelligent modulation control module, and the acquired variable flow parameter data is sent to the storage database.

[0052] The storage database is used for storing the variable flow parameter data collected by the data acquisition module as historical data.

[0053] The model analysis module is used for establishing a power conversion analysis model based on the historical data stored in the storage database, analyzing the influence of different output voltages on the operation efficiency of the variable flow, and analyzing the probability of device failure under different variable flow loss risk values.

[0054] The intelligent modulation control module is used for determining the required transmission power of the input end of the parallel variable flow at the next moment according to the acquired power generation data, adaptively modulating the output voltages between the variable flows according to the power conversion analysis model established in the model analysis module, and sending the output voltage modulation signals between the variable flows to the wind power equipment management module.

[0055] Further, the wind power equipment management module comprises a generator set management unit, a parallel variable flow management unit and a control signal receiving unit.

[0056] The generator set management unit comprises a plurality of wind power generators distributed in different areas on the sea and connected to the plurality of variable flows through independent machine-side rectifier units and a common DC bus.

[0057] The parallel type converter management unit comprises several converters, and the converters are all of the same type; wherein, the operations of the converters do not interfere with each other, when a device fault occurs in a converter, the faulty converter is isolated, and the output voltages of other converters are recombined;

[0058] The control signal receiving unit is used for receiving the output voltage modulation signals between the converters.

[0059] Further, the model analysis module comprises a historical data analysis unit, an efficiency analysis unit and a fault analysis unit;

[0060] The historical data analysis unit is used for retrieving historical converter parameter data from a storage database for analysis, determining the number of converters in the parallel type converter, determining the packaging volume of each converter, determining the input power and output power of each converter at different times according to the current and voltage at the input end and output end of each converter at different times;

[0061] The efficiency analysis unit is used for taking the voltage at the output end of the converter as the independent variable, and taking the power conversion efficiency of the converter as the dependent variable, to analyze the influence of different output voltages on the operation efficiency of the converter;

[0062] The fault analysis unit is used for selecting historical converter parameter data of a converter fault for analysis, calculating the loss risk value of different converters when a device fault occurs according to the packaging volume of the converter, the input power and output power of the converter; according to the loss risk value of each converter when a device fault occurs, using weibull distribution, analyzing the probability of a device fault of the converter under different loss risk values, to obtain a curve function about the loss risk value and the probability of a device fault of the converter.

[0063] Further, the intelligent modulation control module comprises a power generation data analysis unit, an efficiency analysis unit and a control signal sending unit;

[0064] The power generation data analysis unit is used for analyzing the collected power generation data, and determining the required transmission power of the input end of the parallel type converter at the next time according to the power generation of different wind driven generators;

[0065] The efficiency analysis unit is used for determining the loss risk value of each converter when a device fault occurs according to the current and voltage changes at the input end and output end of each converter; and determining the output voltage between the converters at the next time according to the established power conversion analysis model;

[0066] The control signal sending unit is used for sending the output voltage modulation signals between the converters.

[0067] Further, the interactive display platform is provided, and the manager can view the historical variable flow parameter data in the storage database and the device failure probability of each variable flow through the interactive display platform.

[0068] In the embodiment, the efficiency analysis unit in the intelligent modulation control module determines the loss risk value when each variable flow occurs device failure, determines the device failure probability of each variable flow according to the power conversion analysis model established in the model analysis module, and sends the device failure probability of each variable flow to the interactive display platform.

[0069] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the foregoing embodiments of the present application are described in detail, for those skilled in the art, it still can be modified, or the equivalent replacement of part of the technical features recorded in the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An offshore wind power converter output voltage intelligent modulation control method, characterized in that: The method comprises the following steps: Step S1, transmitting the electric energy generated by the wind turbine generator to the parallel converter for electric energy form conversion; the wind turbine generator comprises a plurality of wind generators; the parallel converter comprises a plurality of converters; Step S2, collecting the power generation data and the conversion parameter data in the electric energy transmission process in step S1; the power generation data comprises the power generation of different wind generators; the conversion parameter data comprises the number of converters participating in the electric energy form conversion, the packaging volume of different converters, and the current and voltage changes of the input and output ends of different converters; Step S3, storing the collected conversion parameter data as historical data in the storage database; based on the historical data stored in the storage database, an electric power conversion analysis model is established to analyze the influence of different output voltages on the operation efficiency of the converter and the probability of equipment failure under different converter loss risk values; The method step of step S3 is: Step S31: Retrieve historical converter parameter data from the stored database for analysis to determine the number of converters in the parallel converter system. And determine the package size of each converter. According to each converter at different times The input and output current and voltage are used to determine the current and voltage of each converter at different times. Input power and output power ; Step S32: Establish a power conversion analysis model, based on... and Determine each converter at different times Power conversion efficiency The voltage at the output of the converter As the independent variable, the power conversion efficiency of the converter As the dependent variable, analyze the impact of different output voltages on the converter's operating efficiency: ； wherein, represents the maximum electrical energy conversion efficiency of the converter; represents the opening coefficient; represents the center output voltage at the maximum electrical energy conversion efficiency of the converter; Step S33, select historical variable flow parameter data of the variable flow device failure to analyze, according to the packaging volume of the variable flow device, the input power and the output power of the variable flow device, calculate the loss risk value of different variable flow devices when the equipment failure occurs . The number of variable flow devices that have analyzed the occurrence of equipment failure; according to the loss risk value of each variable flow device when the equipment failure occurs, adopt weibull distribution, analyze the probability of variable flow device equipment failure under different loss risk value, get the curve function about loss risk value And variable flow device failure probability ;​ Step S4, determining the required transmission power of the input end of the parallel converter at the next moment according to the collected power generation data, and adaptively modulating the output voltages between the converters according to the electric power conversion analysis model established in step S3, and integrating the converted electric energy into the power grid.

2. The offshore wind power converter output voltage intelligent modulation control method according to claim 1, characterized in that: The plurality of wind generators are distributed in different areas on the sea, and are connected to the plurality of converters through the respective independent machine-side rectifier units and a common DC bus, and finally are integrated into the power grid through the plurality of converters for electric energy form conversion; the converters are all of the same type; wherein the operation of each converter does not interfere with each other, and when there is a device failure of a converter, the failed converter is isolated, and the output voltages of the other converters are reorganized.

3. The offshore wind power converter output voltage intelligent modulation control method according to claim 1, characterized in that: The method step of step S4 is: Step S41, analyze the collected power generation data, and determine the required transmission power of the input end of the parallel type converter at the next moment according to the power generation of different wind turbines ; Step S42, according to the current and voltage changes of the input end and the output end in each converter, determine the loss risk value of each converter when a device fault occurs ; According to the power conversion analysis model established in step S3, the output voltage between each converter at the next moment is determined so as to satisfy the condition formula: ； wherein, represents the optimal working state of the parallel type converter; represents the input power of the first converter at the next moment, and ; represents the power conversion efficiency of the converter when the output voltage is ; represents the loss risk value when the current first converter has a device failure; represents the packaging volume of the first converter; represents the output voltage of the first converter at the next moment, determined according to ; represents the influence weight of the power loss in the power conversion process of the parallel type converter; represents the influence weight of the device failure probability in the power conversion process of the parallel type converter; Step S43, according to The converted electric energy is incorporated into the power grid after the output voltage between each converter at the next moment is modulated and controlled.

4. The offshore wind power converter output voltage intelligent modulation control method according to claim 3, characterized in that: An interactive display platform is provided, and the management personnel can view the historical conversion parameter data in the storage database and the device failure probability of each converter through the interactive display platform.

5. An offshore wind power converter output voltage intelligent modulation control system, applying the offshore wind power converter output voltage intelligent modulation control method according to any one of claims 1-4, characterized in that: The system comprises a wind power equipment management module, a data acquisition module, a storage database, a model analysis module, and an intelligent modulation control module; The wind power equipment management module is used for transmitting the electric energy generated by the wind turbine generator to the parallel converter for electric energy form conversion and then integrating the electric energy into the power grid; the wind turbine generator comprises a plurality of wind generators; the parallel converter comprises a plurality of converters; The data acquisition module is used for collecting the power generation data and the conversion parameter data in the electric energy transmission process in the wind power equipment management module; the power generation data comprises the power generation of different wind generators; the conversion parameter data comprises the number of converters participating in the electric energy form conversion, the packaging volume of different converters, and the current and voltage changes of the input and output ends of different converters; the collected power generation data is sent to the intelligent modulation control module, and the collected conversion parameter data is sent to the storage database; The storage database is used for storing the conversion parameter data collected by the data acquisition module as historical data; The model analysis module is configured to establish a power conversion analysis model based on historical data stored in a storage database, analyze the influence of different output voltages on the operation efficiency of the converter, and analyze the probability of equipment failure of different converters under different converter loss risk values. The intelligent modulation control module is configured to determine the required transmission power of the input end of the parallel converter at the next moment according to the collected power generation data, perform adaptive modulation on the output voltages between the converters according to the power conversion analysis model established by the model analysis module, and send the output voltage modulation signals between the converters to the wind power equipment management module.

6. The offshore wind power converter output voltage intelligent modulation control system according to claim 5, characterized in that: The wind power equipment management module includes a generator set management unit, a parallel converter management unit, and a control signal receiving unit. The generator set management unit includes a plurality of wind power generators distributed in different areas of the sea and connected to the plurality of converters through independent machine-side rectifier units and a common DC bus. The parallel converter management unit includes a plurality of converters, and the converters are all of the same type. The operation of each converter does not interfere with each other. When a converter fails, the failed converter is isolated, and the output voltages of the other converters are reorganized. The control signal receiving unit is configured to receive the output voltage modulation signals between the converters.

7. The offshore wind power converter output voltage intelligent modulation control system according to claim 6, characterized in that: The model analysis module includes a historical data analysis unit, an efficiency analysis unit, and a failure analysis unit. The historical data analysis unit is configured to analyze historical converter parameter data from the storage database, determine the number of converters in the parallel converter, determine the packaging volume of each converter, determine the input power and output power of each converter at different times according to the current and voltage of the input end and the output end of each converter at different times, and determine the number of converters in the parallel converter. The efficiency analysis unit is configured to analyze the influence of different output voltages on the operation efficiency of the converter by taking the voltage at the output end of the converter as the independent variable and the power conversion efficiency of the converter as the dependent variable. The failure analysis unit is configured to select historical converter parameter data of a failed converter for analysis, calculate the loss risk value of the failed converter according to the packaging volume of the converter, the input power of the converter, and the output power of the converter, and analyze the probability of equipment failure of the converter under different loss risk values by using weibull distribution to obtain a curve function of the loss risk value and the probability of equipment failure of the converter. The intelligent modulation control module includes a power generation data analysis unit, an efficiency analysis unit, and a control signal sending unit.

8. The offshore wind power converter output voltage intelligent modulation control system according to claim 7, characterized in that: The power generation data analysis unit is configured to analyze the collected power generation data, determine the required transmission power of the input end of the parallel converter at the next moment according to the power generation of different wind power generators, and determine the required transmission power of the input end of the parallel converter at the next moment according to the power generation of different wind power generators. The efficiency analysis unit is configured to determine the loss risk value of each converter when equipment failure occurs according to the current and voltage changes of the input end and the output end of each converter. According to the established power conversion analysis model, the output voltages between the converters at the next moment are determined. ​ The control signal sending unit is configured to send output voltage modulation signals between the variable current converters.

9. The offshore wind power converter output voltage intelligent modulation control system according to claim 8, characterized in that: The interactive display platform is provided, and the management personnel can view historical variable current parameter data in the storage database and equipment failure probabilities of the variable current converters through the interactive display platform.

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