CN111596160A - MMC converter valve submodule online monitoring method and system - Google Patents

MMC converter valve submodule online monitoring method and system Download PDF

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CN111596160A
CN111596160A CN202010549220.5A CN202010549220A CN111596160A CN 111596160 A CN111596160 A CN 111596160A CN 202010549220 A CN202010549220 A CN 202010549220A CN 111596160 A CN111596160 A CN 111596160A
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igbt
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CN111596160B (en
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冯静波
邓卫华
胡榕
孙雯
王方方
党青
洪梓洋
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State Grid Corp of China SGCC
State Grid Zhejiang Electric Power Co Ltd
Global Energy Interconnection Research Institute
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State Grid Corp of China SGCC
State Grid Zhejiang Electric Power Co Ltd
Global Energy Interconnection Research Institute
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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Abstract

The invention discloses an MMC converter valve submodule online monitoring method and a system, wherein the method comprises the following steps: acquiring a trigger signal of a switch module and an electric quantity parameter of the running state of each submodule; calculating the operation monitoring parameters of each submodule according to the switch module trigger signal and the electric quantity parameters of the operation state of each submodule; and judging whether the operation of each sub-module is abnormal according to a preset sub-module operation monitoring parameter threshold value, the electrical quantity parameter of the operation state of each sub-module and the operation monitoring parameter of each sub-module to obtain a monitoring result. The invention analyzes and calculates the measured electric parameters of the operation state of each submodule to obtain various submodule operation monitoring parameters which can visually reflect the operation state of the converter valve submodule, thereby facilitating maintenance personnel to monitor the MMC converter valve submodule at multiple angles and maintaining the safe operation of the converter valve more accurately, more conveniently and effectively.

Description

MMC converter valve submodule online monitoring method and system
Technical Field
The invention relates to the technical field of electricity, in particular to an MMC converter valve submodule online monitoring method and system.
Background
With the rapid development and application of a Modular Multilevel Converter (MMC for short) in the direct current transmission fields of power grid transmission, offshore wind power access and the like, the operational reliability and safety of the Converter valve are very important. The converter valve is used as core equipment of flexible direct current transmission, impact and aging tests from inside and outside of the system can be constantly carried out, the bypass of the lighter sub-module exits, and the fault system of the heavier converter valve trips. The existing MMC converter valve monitoring only adopts the detection of a trigger signal frequency issued by a valve base controller and a feedback signal of an IGBT switching state, but only conventional monitoring can not truly reflect the operation state of a converter valve submodule device, the health evaluation of the converter valve submodule device is not accurate and intuitive, and the judgment of operators is inconvenient
Disclosure of Invention
Therefore, the invention aims to overcome the defect that health assessment of the MMC converter valve sub-module is not accurate and intuitive due to the fact that the conventional quantity of the running state of the MMC converter valve sub-module is detected in the prior art, and provides an MMC converter valve sub-module online monitoring method and system.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, an embodiment of the present invention provides an online monitoring method for an MMC converter valve sub-module, where the MMC converter valve sub-module includes a plurality of switch modules, a discharge resistor, and a capacitor, the plurality of switch modules form a bridge circuit structure, and the discharge resistor and the capacitor are respectively connected in parallel with the bridge circuit, and the online monitoring method includes: acquiring a trigger signal of a switch module and an electric quantity parameter of the running state of each submodule; calculating the operation monitoring parameters of each submodule according to the trigger signal of the switch module and the electric quantity parameters of the operation state of each submodule; and judging whether the operation of each sub-module is abnormal according to a preset sub-module operation monitoring parameter threshold value, the electrical quantity parameter of the operation state of each sub-module and the operation monitoring parameter of each sub-module to obtain a monitoring result.
In one embodiment, the switch module is formed by connecting an IGBT in anti-parallel with a diode; the electric quantity parameters of the operation states of the submodules comprise: bridge arm current, capacitor voltage, lower bridge arm IGBT collector-emitter voltage, switch module temperature, IGBT parameters, discharge resistance temperature and discharge resistance parameters.
In one embodiment, calculating the operation monitoring parameter of each sub-module according to the switch module trigger signal and the electrical parameter of the operation status of each sub-module includes: calculating to obtain a capacitance current according to the bridge arm current and the switch module trigger signal; calculating to obtain a capacitance value of the capacitor according to the capacitance current and the capacitance voltage; calculating to obtain the effective current of the IGBT and the diode according to the bridge arm current and the trigger signal; calculating to obtain the junction temperature of the switch module according to the bridge arm current, the voltage of the IGBT collector and emitter of the lower bridge arm, the temperature of the switch module and the IGBT parameters; obtaining the switching frequency of the IGBT and the diode according to the change of the voltage of the collector and emitter of the lower bridge arm IGBT; and calculating the discharge resistance power and the discharge resistance junction temperature according to the discharge resistance temperature, the capacitor voltage and the discharge resistance parameters.
In an embodiment, the determining whether the operation of each sub-module is abnormal according to a preset sub-module operation monitoring parameter threshold, an electrical quantity parameter of an operation state of each sub-module, and an operation monitoring parameter of each sub-module, and obtaining a monitoring result includes: judging whether the ratio of the difference value between the capacitance value of the capacitor and the rated capacitance value to the capacitance value of the capacitor is greater than a preset ratio or not, and judging that the capacitor fails when the ratio is greater than the preset ratio; judging whether the IGBT effective current, the diode effective current, the junction temperature of the switch module, the IGBT switching frequency and the diode switching frequency are larger than the corresponding preset IGBT effective current, the preset diode effective current, the preset switch module junction temperature, the preset IGBT switching frequency and the preset diode switching frequency, and judging that the switch module is abnormal when at least one of the IGBT effective current, the diode effective current, the junction temperature of the switch module, the IGBT switching frequency and the diode switching frequency is larger than the corresponding preset sub-module operation monitoring parameter threshold value; and judging whether the junction temperature of the discharge resistor is greater than the preset junction temperature of the resistor, and judging that the discharge resistor is abnormal when the junction temperature of the discharge resistor is greater than the preset junction temperature of the resistor.
In an embodiment, the online monitoring method for the submodule of the MMC converter valve further includes: and when the capacitor fails, and/or the switch module is abnormal, and/or the discharge resistor is abnormal, an alarm signal is sent out.
In a second aspect, an embodiment of the present invention provides an online monitoring system for an MMC converter valve sub-module, where the MMC converter valve sub-module includes a plurality of switch modules, a discharge resistor, and a capacitor, the plurality of switch modules form a bridge circuit structure, the discharge resistor and the capacitor are respectively connected in parallel with the bridge circuit, and the online monitoring system includes: the parameter acquisition module is used for acquiring a trigger signal of the switch module and an electric quantity parameter of the running state of each submodule; the data collection module is used for acquiring a trigger signal of the switch module and the electric quantity parameters of the operation states of the submodules, and classifying the electric quantity parameters of the operation states of the submodules to obtain data packets of the switch module, the discharge resistor and the capacitor; the data processing module is used for calculating the operation monitoring parameters of each submodule according to the operation state electric quantity parameters of each submodule; and judging whether the operation of each sub-module is abnormal according to a preset sub-module operation monitoring parameter threshold value, the electrical quantity parameter of the operation state of each sub-module and the operation monitoring parameter of each sub-module to obtain a monitoring result.
In one embodiment, the switch module is formed by connecting an IGBT in anti-parallel with a diode; the sub-module operation state electric quantity parameters comprise: bridge arm current, capacitor voltage, lower bridge arm IGBT collector-emitter voltage, switch module temperature, IGBT parameters, discharge resistance temperature and discharge resistance parameters.
In one embodiment, the data processing module comprises: the capacitance operation parameter calculation unit is used for calculating to obtain capacitance current according to the bridge arm current and the switch module trigger signal; calculating to obtain a capacitance value of the capacitor according to the capacitance current and the capacitance voltage; the switch module operation parameter calculation unit is used for calculating effective currents of the IGBT and the diode according to the bridge arm current and the trigger signal; calculating to obtain the junction temperature of the switch module according to the bridge arm current, the voltage of the IGBT collector and emitter of the lower bridge arm, the temperature of the switch module and the IGBT parameters; obtaining the switching frequency of the IGBT and the diode according to the change of the voltage of the collector and emitter of the lower bridge arm IGBT; and the resistor operation parameter calculation unit is used for calculating the discharge resistor power and the discharge resistor junction temperature according to the discharge resistor temperature, the capacitor voltage and the discharge resistor parameters.
In one embodiment, the data processing module further comprises: the capacitor running state judging unit is used for judging whether the ratio of the difference value between the capacitance value of the capacitor and the rated capacitance value to the capacitance value of the capacitor is greater than a preset ratio or not, and judging that the capacitor fails when the ratio is greater than the preset ratio; the switching module operation state judging unit is used for judging whether the IGBT effective current, the diode effective current, the switching module junction temperature, the IGBT switching frequency and the diode switching frequency are larger than the corresponding preset IGBT effective current, the preset diode effective current, the preset switching module junction temperature, the preset IGBT switching frequency and the preset diode switching frequency or not, and judging that the switching module is abnormal when at least one of the IGBT effective current, the diode effective current, the switching module junction temperature, the IGBT switching frequency and the diode switching frequency is larger than the corresponding preset submodule operation monitoring parameter threshold value; and the resistor running state judging unit is used for judging whether the discharging resistor junction temperature is greater than the preset resistor junction temperature or not, and judging that the discharging resistor is abnormal when the discharging resistor junction temperature is greater than the preset resistor junction temperature.
In an embodiment, the online monitoring system for the submodule of the MMC converter valve further includes: the display module is used for displaying the monitoring result; and the alarm module is used for sending out an alarm signal when the sub-module operates abnormally.
The technical scheme of the invention has the following advantages:
1. according to the online monitoring method for the MMC converter valve sub-modules, the electric quantity parameters of the operation states of the sub-modules obtained through measurement are analyzed and calculated to obtain multiple sub-module operation monitoring parameters capable of visually reflecting the operation states of the converter valve sub-modules, so that maintenance personnel can conveniently monitor the MMC converter valve sub-modules in multiple angles, and the safe operation of the converter valve can be maintained more accurately, conveniently and effectively; the method comprises the steps of collecting operation state electrical quantity parameters of each submodule of the converter valve to obtain operation monitoring parameters capable of reflecting the health state of a device, comparing the operation state electrical quantity parameters and the monitoring parameters of the submodules with corresponding preset submodule operation monitoring parameter thresholds, and judging whether the submodules are abnormal in operation or not, so that operation and maintenance personnel can conveniently process the submodule of the converter valve correctly, and the reliability of the submodules is improved.
2. The MMC converter valve sub-module on-line monitoring system provided by the invention has the advantages that a parameter acquisition module can monitor and acquire the electric quantity parameters of the running state of each sub-module of the converter valve in real time, a data processing module classifies the electric quantity parameters of the running state of each sub-module to obtain the data packet of each component, the data processing module utilizes the data packet to perform programmed analysis and calculation on the monitoring parameters of each component respectively to obtain the running monitoring parameters capable of reflecting the health state of the component, the data processing module compares the electric quantity parameters and the monitoring parameters of the running state of the sub-module with the corresponding preset sub-module running monitoring parameter threshold value to judge whether the running of each sub-module is abnormal or not, when the sub-module runs abnormally, operation and maintenance personnel can conveniently perform correct processing on the converter valve sub-module, early warning and early processing of the abnormal state of the converter valve are ensured, and the, the safe operation of the direct current system is ensured to the maximum extent.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a specific structure of a sub-module provided in an embodiment of the present invention;
FIG. 2 is a flow chart of a specific example of an online monitoring method according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a specific example of monitoring parameters for the operation of each sub-module according to an embodiment of the present invention;
fig. 4 is a flowchart of a specific example of determining whether operation of each sub-module is abnormal according to the embodiment of the present invention;
fig. 5 is a composition diagram of a specific example of an online monitoring system provided by the embodiment of the present invention;
fig. 6 is a composition diagram of a specific example of a data processing module according to an embodiment of the present invention;
fig. 7 is a functional component diagram of another specific example of the online monitoring system according to the embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The embodiment of the invention provides an MMC converter valve submodule online monitoring method, which is applied to occasions needing to monitor various components in a large-scale MMC converter valve submodule, wherein the MMC converter valve submodule comprises a plurality of switch modules, a discharge resistor and a capacitor, the plurality of switch modules form a bridge circuit structure, the discharge resistor and the capacitor are respectively connected with the bridge circuit in parallel, the MMC converter valve submodule is shown in figure 1, the switch modules in figure 1 form a half-bridge structure or a full-bridge structure, the switch modules are formed by connecting an IGBT (insulated gate bipolar transistor) in an anti-parallel mode with a diode, in addition, the plurality of switch modules can simultaneously form a three-phase converter valve, a half-wave converter and the like, and the switch modules can be formed by other components, such as MOSFET (metal-oxide-. As shown in fig. 2, the online monitoring method includes:
step S1: and acquiring a trigger signal of the switch module and an electric quantity parameter of the running state of each submodule.
The electric quantity parameters of the running state of each submodule in the embodiment of the invention comprise: bridge arm current, capacitor voltage, lower bridge arm IGBT collector-emitter voltage, switch module temperature, IGBT parameters, discharge resistance temperature and discharge resistance parameters, and a switch module trigger signal is sent by a valve base controller.
Step S2: and calculating the operation monitoring parameters of each submodule according to the trigger signal of the switch module and the electric quantity parameters of the operation state of each submodule.
In the prior art, methods for monitoring the operating state of sub-modules are mostly directed to the detection of conventional quantities, for example: the bridge arm current, the bridge arm voltage and the like are monitored only by conventional quantities, the running state of a converter valve sub-module device cannot be truly reflected, the health assessment of the converter valve sub-module device is not accurate and visual, and judgment of operators is inconvenient.
Step S3: and judging whether the operation of each sub-module is abnormal according to a preset sub-module operation monitoring parameter threshold value, the electrical quantity parameter of the operation state of each sub-module and the operation monitoring parameter of each sub-module to obtain a monitoring result.
The method and the device for judging the operation state of the converter valve have the advantages that various preset sub-module operation monitoring parameter thresholds are set to provide judgment bases for the operation state of the converter valve, the preset sub-module operation monitoring parameter thresholds not only comprise bridge arm voltage and bridge arm current thresholds of the converter valve, but also comprise operation monitoring parameter thresholds of all components, and whether the operation of each sub-module is abnormal or not is judged by judging whether the electrical quantity parameter of the operation state of each sub-module and the operation monitoring parameter of each sub-module are larger than the corresponding preset sub-module operation monitoring parameter threshold.
The abnormal conditions of each sub-module in the embodiment of the invention comprise: when the capacitor fails, the switch module is abnormal, and the discharge resistance is abnormal, when the capacitor fails, and/or the switch module is abnormal, and/or the discharge resistance is abnormal, an alarm signal is sent.
According to the online monitoring method for the MMC converter valve sub-modules, provided by the embodiment of the invention, the measured electric quantity parameters of the running states of the sub-modules are analyzed and calculated to obtain various sub-module running monitoring parameters capable of visually reflecting the running states of the converter valve sub-modules, so that maintenance personnel can conveniently monitor the MMC converter valve sub-modules at multiple angles, and the safe running of the converter valve can be maintained more accurately, conveniently and effectively.
In an embodiment, as shown in fig. 3, calculating the operation monitoring parameters of each sub-module according to the switch module trigger signal and the electrical parameter of the operation status of each sub-module includes:
step S21: calculating to obtain a capacitance current according to the bridge arm current and the switch module trigger signal; and calculating to obtain the capacitance value of the capacitor according to the capacitance current and the capacitance voltage.
Taking the half-bridge sub-module in fig. 1 as an example, assuming that the IGBT trigger signal of the upper bridge arm is k and the direction of the current flowing out of the capacitor is positive, the capacitive current icThe calculation formula is shown as formula (1).
ic＝k·is(1)
In the formula, k is 1, which represents that the turn-on current of the IGBT is in the forward direction; k is-1, representing that the IGBT turn-off current is negative, isIs the bridge arm current.
According to the capacitance current icAnd a capacitor voltage UcCalculating to obtain capacitance value CtestAs shown in formula (2).
Figure BDA0002541859870000091
In the formula Ic-50Hz(rms)Effective value of capacitor fundamental current, Uc-50Hz(rms)The fundamental effective values of the capacitor voltage and the current can be obtained by FFT analysis for the effective value of the capacitor fundamental voltage and omega for the fundamental angular frequency.
Step S22: calculating to obtain the effective current of the IGBT and the diode according to the bridge arm current and the trigger signal; calculating to obtain the junction temperature of the switch module according to the bridge arm current, the voltage of the IGBT collector and emitter of the lower bridge arm, the temperature of the switch module and the IGBT parameters; and obtaining the switching frequency of the IGBT and the diode according to the change of the voltage of the collector and the emitter of the lower bridge arm IGBT.
The IGBT is used as a core power device of the MMC converter valve, the reliability and the health state of the IGBT are visual and important, and key parameters capable of judging the health condition of the IGBT mainly comprise effective current, junction temperature and switching frequency. The effective current of the IGBT device can be obtained by decomposing bridge arm current and a trigger signal of the IGBT device, the junction temperature can be obtained by calculating the temperature of a radiator and the loss of the IGBT device, and the switching frequency can be obtained by calculating the change of the collector-emitter voltage of the lower tube.
Taking the sub-module of the half-bridge structure in FIG. 1 as an example, let the bridge arm current of the converter valve be isThe trigger signal of the upper arm IGBT is k1, the trigger signal of the lower arm IGBT is k2 (when the IGBT is turned on, k1 and k2 are 1, when the IGBT is turned off, k1 and k2 are 0), the direction of the current flowing out of the capacitor is a positive direction, the instantaneous current of each component of the IGBT submodule is calculated according to formulas (3) to (4), and the effective value of each component of the submodule can be obtained after the instantaneous current of each component is analyzed through FFT.
When the current flowing direction is positive, the instantaneous current of the upper bridge arm IGBT tube T1iT1And lower bridge arm IGBT tube T2 instantaneous current iT2Upper arm diode D1 instantaneous current iD1Lower arm diode D2 transient current iD2As shown in formula (3).
Figure BDA0002541859870000101
When the current flowing direction is negative, the instantaneous current i of the upper bridge arm IGBT tube T1T1And lower bridge arm IGBT tube T2 instantaneous current iT2Upper arm diode D1 instantaneous current iD1Lower arm diode D2 transient current iD2As shown in formula (3).
Figure BDA0002541859870000102
The embodiment of the invention is based on the temperature T of the switch moduleCCalculating the loss P of the switch module according to the loss calculation method specified by the standard IEC 62751, wherein the loss P of the switch module comprises the on-state and switching loss calculation of the IGBT and the diode, and the temperature T of the switch module is usedCLoss P of the switch module and IGBT parameters (the parameters comprise the junction-to-shell thermal resistance R inside the IGBT)th(j-c)And contact thermal resistance Rth(c-s)) And calculating to obtain the junction temperature T of the switch modulevjAs shown in equation (5).
Figure BDA0002541859870000111
The switching frequency of the switching module is the switching frequency of the IGBT device in unit time, and one switching-on and switching-off process exists for each current switching of the switching module, so that the switching frequency of the device can be obtained by counting the voltage change condition of the collector-emitter of the lower bridge arm IGBT (or the voltage change condition of the collector-emitter of the upper bridge arm IGBT) in time t, the direction of current flowing out of the capacitor is selected as a positive direction, and the switching frequency calculation method is shown in formulas (6) to (7).
When the current flowing direction is positive, the current f of the upper bridge arm IGBT tube T1T1Lower bridge arm IGBT tube T2 electricityFlow fT2Upper arm diode D1 current fD1Lower arm diode D2 current fD2As shown in formula (6), wherein klow-levelAnd khigh-levelFor counting the times of the change of the voltage of the collector and emitter of the lower bridge arm IGBT within the time t (the high voltage is the capacitance voltage value, the low voltage is the IGBT on-state voltage)
Figure BDA0002541859870000112
When the current flowing direction is negative, the upper bridge arm IGBT tube T1 current fT1Lower bridge arm IGBT tube T2 current fT2Upper arm diode D1 current fD1Lower arm diode D2 current fD2As shown in formula (7).
Figure BDA0002541859870000121
Step S23: and calculating the discharge resistance power and the discharge resistance junction temperature according to the discharge resistance temperature, the capacitor voltage and the discharge resistance parameters.
The discharge resistance power can be obtained by the ratio of the discharge resistance voltage (capacitance voltage) squared to the discharge resistance value, and the discharge resistance junction temperature TRBy incrustation heat resistance R in the discharge resistorR_th(j-c)And contact thermal resistance RR_th(c-s)And discharge resistance temperature PRAnd discharge resistance power PRObtained as shown in a formula (8).
Figure BDA0002541859870000122
In a specific embodiment, as shown in fig. 4, determining whether operation of each sub-module is abnormal according to a preset sub-module operation monitoring parameter threshold, an operation state electrical quantity parameter of each sub-module, and an operation monitoring parameter of each sub-module, to obtain a monitoring result, includes:
step S31: and judging whether the ratio of the difference value between the capacitance value of the capacitor and the rated capacitance value to the capacitance value of the capacitor is greater than a preset ratio or not, and judging that the capacitor fails when the ratio is greater than the preset ratio.
When the capacitance value C of the obtained capacitor is calculatedtestTo a rated value C0When the relationship shown in the formula (9) exists, the health judgment can be made on the capacitor, wherein h is the upper limit of the capacitance failure ratio (preset ratio).
Figure BDA0002541859870000123
Step S32: and judging whether the IGBT effective current, the diode effective current, the junction temperature of the switch module, the IGBT switching frequency and the diode switching frequency are larger than the corresponding preset IGBT effective current, the preset diode effective current, the preset switch module junction temperature, the preset IGBT switching frequency and the preset diode switching frequency, and judging that the switch module is abnormal when at least one of the IGBT effective current, the diode effective current, the junction temperature of the switch module, the IGBT switching frequency and the diode switching frequency is larger than the corresponding preset sub-module operation monitoring parameter threshold value.
When any one of the effective current, the junction temperature and the switching frequency of the components of each submodule is higher than a preset submodule operation monitoring parameter threshold value, the converter valve submodule is indicated to be abnormal, a warning is sent out by the embodiment of the invention so as to monitor the failed submodule in a focused mode or cut off and quit the submodule according to the operation reliability and safety requirements, the converter valve is ensured not to have expanded faults, and early warning is provided for the reliable operation of the converter valve.
Step S33: and judging whether the junction temperature of the discharge resistor is greater than the preset junction temperature of the resistor, and judging that the discharge resistor is abnormal when the junction temperature of the discharge resistor is greater than the preset junction temperature of the resistor.
In a specific embodiment, before calculating the operation monitoring parameters of each sub-module, the operation state electrical parameters of each sub-module may be classified first, and the operation state electrical quantity parameters required in the operation monitoring parameter calculation process of each component in the sub-module are packed to obtain a data packet of each component, each component of each sub-module corresponds to one data packet, the preset sub-module operation monitoring parameter threshold values of all sub-modules are set in a common data packet, and when judging whether the operation of each sub-module is abnormal, the threshold values in the common data packet are called for judgment.
For example: when the bridge arm current, the switch module trigger signal and the capacitor voltage are needed to be used for calculating the capacitance value of the capacitor, the capacitor data packet comprises the bridge arm current, the switch module trigger signal and the capacitor voltage; when the junction temperature, the switching frequency and the effective current of the switch module are calculated, because the temperature, the loss, the crusting thermal resistance and the contact thermal resistance of the switch module are required to be used for calculating the junction temperature, the trigger signal and the bridge arm current of the switch module are required to be used for calculating the effective current of the switch module, and the collector-emitter voltage of the lower bridge arm IGBT (or the collector-emitter voltage of the lower bridge arm IGBT) is required to be used for calculating the switching frequency, the data of the switch module comprises: the temperature, the loss, the crusting thermal resistance, the contact thermal resistance, the trigger signal of the switch module, the bridge arm current and the IGBT collector-emitter voltage (or the lower bridge arm IGBT collector-emitter voltage).
According to the online monitoring method for the MMC converter valve sub-modules, provided by the embodiment of the invention, the electric quantity parameters of the operation states of the sub-modules obtained by measurement are analyzed and calculated to obtain various sub-module operation monitoring parameters capable of visually reflecting the operation states of the converter valve sub-modules, so that maintenance personnel can conveniently monitor the MMC converter valve sub-modules at multiple angles, and the safe operation of the converter valve can be maintained more accurately, conveniently and effectively; the method comprises the steps of collecting operation state electrical quantity parameters of each submodule of the converter valve to obtain operation monitoring parameters capable of reflecting the health state of a device, comparing the operation state electrical quantity parameters and the monitoring parameters of the submodules with corresponding preset submodule operation monitoring parameter thresholds, and judging whether the submodules are abnormal in operation or not, so that operation and maintenance personnel can conveniently process the submodule of the converter valve correctly, and the reliability of the submodules is improved.
Example 2
The embodiment of the invention provides an MMC converter valve submodule online monitoring system, which is used for executing the MMC converter valve submodule online monitoring method in the embodiment 1. As shown in fig. 1, a control device of the MMC converter valve includes a submodule controller and a valve base controller, each submodule corresponds to one submodule controller, and a switch module in fig. 1 is formed by connecting an IGBT in anti-parallel with a diode, but the switch module may also be formed by other switch components. As shown in fig. 5, the online monitoring system includes: the device comprises a parameter acquisition module 1, a data collection module 2 and a data processing module 3.
And the parameter acquisition module is used for acquiring the trigger signal of the switch module and the electric quantity parameters of the running state of each submodule.
The electrical quantity parameters of the operation state of the sub-modules in the embodiment of the invention comprise: the bridge arm circuit comprises a bridge arm current, a capacitor voltage, a lower bridge arm IGBT collector-emitter voltage (or an upper bridge arm collector-emitter voltage), a switch module temperature, IGBT parameters, a discharge resistance temperature and discharge resistance parameters, wherein the parameter acquisition module comprises a current measurement device, a voltage measurement device and a temperature measurement device, the current measurement device is used for detecting the bridge arm circuit, the voltage measurement device is used for measuring the lower bridge arm IGBT collector-emitter voltage (or the upper bridge arm collector-emitter voltage), and the temperature measurement device is used for measuring the switch module temperature and the discharge resistance temperature.
Specifically, the bridge arm current is accurately measured through a bridge arm light CT on the valve side, the capacitance voltage and the lower bridge arm IGBT collector-emitter voltage (or the upper bridge arm collector-emitter voltage) can be measured through an AD sampling unit on a sub-module controller, and the temperature of the switch module and the temperature of the discharge resistor are measured through temperature sensors arranged on the switch module.
And the data collection module is used for acquiring the trigger signal of the switch module and the electric quantity parameters of the operation states of the submodules, and classifying the electric quantity parameters of the operation states of the submodules to obtain data packets of the switch module, the discharge resistor and the capacitor.
Because the MMC converter valve comprises a plurality of sub-modules, and the electrical parameters of the running state of each sub-module are various, in order to facilitate calculation, the data collection module classifies the electrical parameters of the running state of each sub-module according to the electrical parameters of the running state of the sub-module, which are needed in the calculation process of each monitoring parameter of each sub-module, so as to obtain data packets of the switch module, the discharge resistor and the capacitor, and the data packets comprise the electrical parameters of the running state of the sub-module, which are needed in the calculation process of each monitoring parameter.
The data processing module is used for calculating the operation monitoring parameters of each submodule according to the operation state electric quantity parameters of each submodule; and judging whether the operation of each sub-module is abnormal according to a preset sub-module operation monitoring parameter threshold value, the electrical quantity parameter of the operation state of each sub-module and the operation monitoring parameter of each sub-module to obtain a monitoring result.
The data processing module is internally provided with preset sub-module operation detection parameters, the sub-module operation state electrical quantity parameters in the data packet are utilized to respectively calculate the sub-module operation monitoring parameters, and then whether the sub-modules operate abnormally is judged according to the preset sub-module operation monitoring parameter threshold, the sub-module operation state electrical quantity parameters and the sub-module operation monitoring parameters to obtain a monitoring result.
In a specific embodiment, as shown in fig. 6, the data processing module 3 includes: a capacitance operation parameter calculation unit 31, a switch module operation parameter calculation unit 32, a resistance operation parameter calculation unit 33, a capacitance operation state judgment unit 34, a switch module operation state judgment unit 35, and a resistance operation state judgment unit 36.
The capacitance operation parameter calculation unit 31 of the embodiment of the invention is used for calculating to obtain capacitance current according to the bridge arm current and the switch module trigger signal; and calculating to obtain the capacitance value of the capacitor according to the capacitance current and the capacitance voltage.
The embodiment of the invention assumes that the trigger signal of the upper bridge arm IGBT is k, the direction of the current flowing out of the capacitor is a positive direction, and the current i flows out of the bridge arm according to the bridge arm currentsAnd a switch module trigger signal k, and calculating to obtain capacitance current calculation formulas shown in formulas (1) to (2).
The embodiment of the invention is based on the capacitance current icAnd a capacitor voltage UcCalculating to obtain capacitance value CtestAs shown in formula (2).
The switch module operation parameter calculation unit 32 of the embodiment of the invention is used for calculating and obtaining the effective current of the IGBT and the diode according to the bridge arm current and the trigger signal; calculating to obtain the junction temperature of the switch module according to the bridge arm current, the voltage of the IGBT collector and emitter of the lower bridge arm, the temperature of the switch module and the IGBT parameters; and obtaining the switching frequency of the IGBT and the diode according to the change of the voltage of the collector and the emitter of the lower bridge arm IGBT.
The embodiment of the invention takes the half-bridge structure submodule structure shown in fig. 1 as an example, and assumes that the bridge arm current of the converter valve is isThe trigger signal of the upper arm IGBT is k1, the trigger signal of the lower arm IGBT is k2 (when the IGBT is turned on, k1 and k2 are 1, when the IGBT is turned off, k1 and k2 are 0), the direction of the current flowing out of the capacitor is a positive direction, the instantaneous current of each component of the IGBT submodule is calculated according to formulas (3) to (4), and the effective value of each component of the submodule can be obtained after the instantaneous current of each component is analyzed through FFT.
The embodiment of the invention is based on the temperature T of the switch moduleCCalculating the loss P of the switch module according to the loss calculation method specified by the standard IEC 62751, wherein the loss P of the switch module comprises the on-state and switching loss calculation of the IGBT and the diode, and the temperature T of the switch module is usedCLoss P of the switch module and IGBT parameters (the parameters comprise the junction-to-shell thermal resistance R inside the IGBT)th(j-c)And contact thermal resistance Rth(c-s)) And calculating to obtain the junction temperature T of the switch modulevjAs shown in equation (5).
According to the embodiment of the invention, the switching frequency of the device can be obtained by counting the change condition of the collector-emitter voltage of the lower arm IGBT (or the change condition of the collector-emitter voltage of the upper arm IGBT) within the time t, the direction of the current flowing out of the capacitor is selected to be a positive direction, and the switching frequency calculation method is shown in the formulas (6) to (7).
The resistance operation parameter calculation unit 33 according to the embodiment of the present invention is configured to calculate the discharge resistance power and the discharge resistance junction temperature according to the discharge resistance temperature, the capacitor voltage, and the discharge resistance parameter.
The discharge resistance power can be obtained by the ratio of the discharge resistance voltage (capacitance voltage) squared to the discharge resistance value, and the discharge resistance junction temperature TRBy incrustation heat resistance R in the discharge resistorR_th(j-c)And contact thermal resistance RR_th(c-s)And discharge resistance temperature PRAnd discharge resistance power PRObtained as shown in a formula (8).
The capacitor operating state determining unit 34 of the embodiment of the present invention is configured to determine whether a ratio of a difference between a capacitance value of the capacitor and a rated capacitance value to the capacitance value of the capacitor is greater than a preset ratio, and determine that the capacitor is failed when the ratio is greater than the preset ratio.
When the capacitance value C of the obtained capacitor is calculatedtestTo a rated value C0When the relationship shown in the formula (9) exists, the health judgment can be made on the capacitor, wherein h is the upper limit of the capacitance failure ratio (preset ratio).
The switching module operation state determining unit 35 of the embodiment of the present invention is configured to determine whether an IGBT effective current, a diode effective current, a switching module junction temperature, an IGBT switching frequency, and a diode switching frequency are greater than a corresponding preset IGBT effective current, a preset diode effective current, a preset switching module junction temperature, a preset IGBT switching frequency, and a preset diode switching frequency, and determine that a switching module is abnormal when at least one of the IGBT effective current, the diode effective current, the switching module junction temperature, the IGBT switching frequency, and the diode switching frequency is greater than a corresponding preset sub-module operation monitoring parameter threshold. The resistor operation state judgment unit 36 is configured to judge whether the discharge resistor junction temperature is greater than a preset resistor junction temperature, and when the discharge resistor junction temperature is greater than the preset resistor junction temperature, judge that the discharge resistor is abnormal.
When any one of the effective current, the junction temperature and the switching frequency of the components of each submodule is higher than a preset submodule operation monitoring parameter threshold value, the converter valve submodule is indicated to be abnormal, a warning is sent out by the embodiment of the invention so as to monitor the failed submodule in a focused mode or cut off and quit the submodule according to the operation reliability and safety requirements, the converter valve is ensured not to have expanded faults, and early warning is provided for the reliable operation of the converter valve.
In a specific embodiment, as shown in fig. 7, the online monitoring system for the submodule of the MMC converter valve further includes: the display module 4 is used for displaying the monitoring result; and the alarm module 5 is used for sending out an alarm signal when the sub-module operates abnormally.
The display module and the alarm module are connected with the data processing module in a data bus mode, so that visual key data monitoring results of the health condition of the converter valve sub-module are provided for operators, the operators can monitor the sub-module online in real time conveniently, abnormal sub-modules are early warned, and reliable operation of the converter valve is guaranteed.
In the online monitoring system for the submodule of the MMC converter valve provided by the embodiment of the invention, the parameter acquisition module can monitor and acquire the operating state electrical quantity parameters of each submodule of the converter valve in real time, the data processing module classifies the operating state electrical quantity parameters of each submodule to obtain the data packet of each component, the data processing module utilizes the data packet to perform programmed analysis and calculation on the monitoring parameters of each component respectively to obtain the operating monitoring parameters capable of reflecting the health state of the component, the data processing module compares the operating state electrical quantity parameters and the monitoring parameters of the submodules with the corresponding preset operating monitoring parameter threshold of the submodules to judge whether the operation of each submodule is abnormal or not, when the operation of the submodules is abnormal, operation and maintenance personnel can conveniently perform correct processing on the submodule of the converter valve, thereby ensuring early warning and early processing of the abnormal state of the converter valve and improving the reliability and safety of the operation of the converter, the safe operation of the direct current system is ensured to the maximum extent.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.

Claims (10)

1. The utility model provides a MMC converter valve submodule piece on-line monitoring method which characterized in that, MMC converter valve submodule piece includes a plurality of switch module, discharge resistance and electric capacity, a plurality of switch module constitute bridge circuit structure, discharge resistance and electric capacity respectively with bridge circuit parallel connection, the on-line monitoring method includes:
acquiring a trigger signal of a switch module and an electric quantity parameter of the running state of each submodule;
calculating the operation monitoring parameters of each submodule according to the switch module trigger signal and the electric quantity parameters of the operation state of each submodule;
and judging whether the operation of each sub-module is abnormal according to a preset sub-module operation monitoring parameter threshold value, the electrical quantity parameter of the operation state of each sub-module and the operation monitoring parameter of each sub-module to obtain a monitoring result.
2. The MMC converter valve sub-module on-line monitoring method of claim 1,
the switch module is formed by connecting an IGBT (insulated gate bipolar transistor) in anti-parallel with a diode;
the electric quantity parameters of the operation states of the sub-modules comprise: bridge arm current, capacitor voltage, lower bridge arm IGBT collector-emitter voltage, switch module temperature, IGBT parameters, discharge resistance temperature and discharge resistance parameters.
3. The MMC converter valve submodule online monitoring method of claim 2, wherein calculating each submodule operation monitoring parameter according to the switch module trigger signal and each submodule operation state electrical quantity parameter comprises:
calculating to obtain a capacitance current according to the bridge arm current and a switch module trigger signal; calculating to obtain a capacitance value of the capacitor according to the capacitance current and the capacitance voltage;
calculating to obtain the effective current of the IGBT and the diode according to the bridge arm current and the trigger signal; calculating to obtain the junction temperature of the switch module according to the bridge arm current, the voltage of the IGBT collector and emitter of the lower bridge arm, the temperature of the switch module and the IGBT parameters; obtaining the switching frequency of the IGBT and the diode according to the change of the voltage of the collector and emitter of the lower bridge arm IGBT;
and calculating the discharge resistance power and the discharge resistance junction temperature according to the discharge resistance temperature, the capacitor voltage and the discharge resistance parameters.
4. The MMC converter valve sub-module online monitoring method of claim 3, wherein judging whether each sub-module is abnormal according to a preset sub-module operation monitoring parameter threshold, each sub-module operation state electrical quantity parameter and each sub-module operation monitoring parameter to obtain a monitoring result comprises:
judging whether the ratio of the difference value between the capacitance value of the capacitor and the rated capacitance value to the capacitance value of the capacitor is greater than a preset ratio or not, and judging that the capacitor fails when the ratio is greater than the preset ratio;
judging whether the IGBT effective current, the diode effective current, the junction temperature of the switch module, the IGBT switching frequency and the diode switching frequency are larger than the corresponding preset IGBT effective current, the preset diode effective current, the preset switch module junction temperature, the preset IGBT switching frequency and the preset diode switching frequency, and judging that the switch module is abnormal when at least one of the IGBT effective current, the diode effective current, the junction temperature of the switch module, the IGBT switching frequency and the diode switching frequency is larger than the corresponding preset sub-module operation monitoring parameter threshold value;
and judging whether the junction temperature of the discharge resistor is greater than the preset junction temperature of the resistor, and judging that the discharge resistor is abnormal when the junction temperature of the discharge resistor is greater than the preset junction temperature of the resistor.
5. The MMC converter valve sub-module online monitoring method of claim 4, further comprising:
and when the capacitor fails, and/or the switch module is abnormal, and/or the discharge resistor is abnormal, an alarm signal is sent out.
6. The utility model provides a MMC converter valve submodule piece on-line monitoring system, its characterized in that, MMC converter valve submodule piece includes a plurality of switch modules, discharge resistance and electric capacity, a plurality of switch modules constitute bridge circuit structure, discharge resistance and electric capacity respectively with bridge circuit parallel connection, on-line monitoring system includes:
the parameter acquisition module is used for acquiring a trigger signal of the switch module and an electric quantity parameter of the running state of each submodule;
the data collection module is used for acquiring a trigger signal of the switch module and the electric quantity parameters of the operation states of the submodules, and classifying the electric quantity parameters of the operation states of the submodules to obtain a data packet of the switch module, the discharge resistor and the capacitor;
the data processing module is used for calculating the operation monitoring parameters of each submodule according to the operation state electrical quantity parameters of each submodule; and judging whether the operation of each sub-module is abnormal according to a preset sub-module operation monitoring parameter threshold value, the electrical quantity parameter of the operation state of each sub-module and the operation monitoring parameter of each sub-module to obtain a monitoring result.
7. The MMC converter valve sub-module online monitoring system of claim 6,
the switch module is formed by connecting an IGBT (insulated gate bipolar transistor) in anti-parallel with a diode;
the sub-module operation state electrical quantity parameters comprise: bridge arm current, capacitor voltage, lower bridge arm IGBT collector-emitter voltage, switch module temperature, IGBT parameters, discharge resistance temperature and discharge resistance parameters.
8. The MMC converter valve sub-module online monitoring system of claim 7, wherein the data processing module comprises:
the capacitance operation parameter calculation unit is used for calculating to obtain capacitance current according to the bridge arm current and the switch module trigger signal; calculating to obtain a capacitance value of the capacitor according to the capacitance current and the capacitance voltage;
the switch module operation parameter calculation unit is used for calculating effective currents of the IGBT and the diode according to the bridge arm current and the trigger signal; calculating to obtain the junction temperature of the switch module according to the bridge arm current, the voltage of the IGBT collector and emitter of the lower bridge arm, the temperature of the switch module and the IGBT parameters; obtaining the switching frequency of the IGBT and the diode according to the change of the voltage of the collector and emitter of the lower bridge arm IGBT;
and the resistor operation parameter calculation unit is used for calculating the discharge resistor power and the discharge resistor junction temperature according to the discharge resistor temperature, the capacitor voltage and the discharge resistor parameters.
9. The MMC converter valve sub-module online monitoring system of claim 8, wherein the data processing module further comprises:
the capacitor running state judging unit is used for judging whether the ratio of the difference value between the capacitance value of the capacitor and the rated capacitance value to the capacitance value of the capacitor is greater than a preset ratio or not, and judging that the capacitor fails when the ratio is greater than the preset ratio;
the switching module operation state judging unit is used for judging whether the IGBT effective current, the diode effective current, the switching module junction temperature, the IGBT switching frequency and the diode switching frequency are larger than the corresponding preset IGBT effective current, the preset diode effective current, the preset switching module junction temperature, the preset IGBT switching frequency and the preset diode switching frequency or not, and judging that the switching module is abnormal when at least one of the IGBT effective current, the diode effective current, the switching module junction temperature, the IGBT switching frequency and the diode switching frequency is larger than the corresponding preset submodule operation monitoring parameter threshold value;
and the resistor running state judging unit is used for judging whether the discharging resistor junction temperature is greater than the preset resistor junction temperature or not, and judging that the discharging resistor is abnormal when the discharging resistor junction temperature is greater than the preset resistor junction temperature.
10. The MMC converter valve sub-module on-line monitoring system of claim 6, further comprising:
the display module is used for displaying the monitoring result;
and the alarm module is used for sending out an alarm signal when the sub-module operates abnormally.
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