CN115047333A - Passive unlocking test method and system for offshore platform converter valve wharf - Google Patents
Passive unlocking test method and system for offshore platform converter valve wharf Download PDFInfo
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- CN115047333A CN115047333A CN202210957590.1A CN202210957590A CN115047333A CN 115047333 A CN115047333 A CN 115047333A CN 202210957590 A CN202210957590 A CN 202210957590A CN 115047333 A CN115047333 A CN 115047333A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0018—Circuits for equalisation of charge between batteries using separate charge circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
- H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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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- General Physics & Mathematics (AREA)
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- Testing Relating To Insulation (AREA)
Abstract
The invention relates to a passive unlocking test method and a passive unlocking test system for an offshore platform converter valve wharf, which comprise the following steps: the method comprises the steps that a sub-module capacitor of the offshore platform converter valve is charged through a test power supply of a marine foundation wharf, and a wiring switch between the test power supply and the offshore platform converter valve is disconnected after charging is finished; issuing a converter valve short-time unlocking command based on an open-loop control strategy to enable the offshore platform converter valve to finish short-time unlocking operation by means of energy stored in the sub-module capacitor; operation data of the offshore platform converter valve during short-time unlocking operation are judged based on preset test criteria, and relevant performance of the flexible direct-current offshore platform is verified. The invention utilizes the low-voltage and small-capacity test power supply of the marine base to realize friendly charging and safe unlocking of the high-voltage and large-power converter valve, so that the comprehensive verification of the basic function of the converter valve can be realized in advance before the offshore platform reaches the offshore station site, and the converter valve can be widely applied to the field debugging field of the flexible and straight system.
Description
Technical Field
The invention relates to the field of field debugging of a far-sea wind power flexible direct current sending-out system, in particular to a passive unlocking test method and system for an offshore platform converter valve wharf of the far-sea wind power flexible direct current sending-out system.
Background
The flexible direct current sending technology is a preferred technical scheme for reliable grid connection of open sea wind power and is the only large-scale open sea wind power grid connection scheme with engineering practice experience at present. Different from a land flexible direct current system, the open sea wind power flexible direct current sending system is characterized in that an electric system, an auxiliary system and safety system equipment of an offshore converter station are arranged on an offshore platform in a centralized mode, the offshore platform is composed of three parts, namely a foundation pile, a jacket and an upper module, and construction and installation costs account for about 19% of total engineering investment.
Because the natural environment at sea is severe, the installation and test conditions are limited, and the transportation and maintenance cost is extremely high, the scheme that all equipment of the offshore platform is installed on a wharf of the marine foundation and is tested to be qualified, and then the offshore platform is transported to the offshore site to be in place is generally adopted. Considering that the repair cost of the offshore platform after the offshore station is transported to the offshore station in place is inestimable, the primary and secondary functions of the offshore converter station equipment are fully verified during the test development of the marine base wharf, so that major potential problems are found in advance and corrected in time, and a good foundation is laid for the smooth development of subsequent debugging after the offshore station is transported to the offshore station.
The converter valve is a key device for realizing energy conversion of the offshore converter station, and successful unlocking of the converter valve is a fundamental sign for comprehensively verifying the basic functions of the offshore converter station. However, the normal unlocking of the converter valve usually has higher requirements on the capacity of the connected power supply, and the capacity of the temporary low-voltage test power supply which can be adopted by the offshore platform is only in the MVA level during the installation test of a marine foundation wharf, and is far lower than the capacity of the power supply which can support the normal unlocking of the converter valve. In order to fully verify the pole control performance, the valve control performance, the pole control and valve control interface, the insulation performance and the like of the offshore platform in advance, how to successfully unlock the high-voltage and high-power converter valve at the marine base dock based on the low-voltage and small-capacity test power supply condition is a key problem to be solved urgently, and meanwhile, the technology has a wide application prospect.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a passive unlocking test method and a passive unlocking test system for an offshore platform converter valve wharf, which can successfully unlock the converter valve by using a low-voltage and small-capacity test power supply of a marine base wharf and fully verify the polar control performance, the valve control performance, the polar control and valve control interface, the insulating performance and the like of an offshore platform of a far-sea wind power flexible direct current sending system.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a passive unlocking test method for an offshore platform converter valve wharf, which comprises the following steps:
the method comprises the steps that a sub-module capacitor of the offshore platform converter valve is charged through a test power supply of a marine foundation wharf, and a wiring switch between the test power supply and the offshore platform converter valve is disconnected after charging is finished;
issuing a converter valve short-time unlocking command based on an open-loop control strategy to enable the converter valve of the offshore platform to finish short-time unlocking operation by means of energy stored in a sub-module capacitor;
operation data of the offshore platform converter valve during short-time unlocking operation are judged based on preset test criteria, and relevant performance of the offshore platform of the open-sea wind power flexible direct current sending-out system is verified.
Further, the method for charging the sub-module capacitor of the converter valve of the offshore platform through the test power supply of the marine base dock comprises the following steps:
determining a charging loop of the converter valve of the offshore platform as an alternating current side charging loop or a direct current side charging loop;
in the uncontrolled charging stage, controlling the voltage of the alternating current side or the voltage of the direct current side of the converter valve to rise to a rated value from 0 according to a preset first rate;
and in the active charging stage, controlling the sub-modules of the converter valve to be sequentially cut off at a preset second rate in turn, so that the capacitor voltage of each sub-module is increased to a rated value at a preset third rate.
Further, the alternating current side charging circuit is as follows: a test power supply of the marine foundation wharf is connected with the alternating current side of the converter valve through the incoming line protection switch cabinet, the voltage regulating transformer, the station transformer and the connecting transformer in sequence, and the single-bridge-arm submodule is charged by using the alternating current line voltage.
Further, the dc side charging circuit refers to: a test power supply of the marine foundation wharf is connected with the direct current side of the flexible direct current converter valve through the incoming line protection switch cabinet, the voltage regulating transformer, the boosting transformer and the voltage doubling rectifier in sequence, and the in-phase upper bridge arm submodule and the in-phase lower bridge arm submodule are charged by using direct current voltage.
Further, the range of the preset first rate is 20% -30% U N Per minute, U N Is the voltage rating.
Further, the preset second rate is 2-4/sec.
Further, the method for issuing the converter valve short-time unlocking command based on the open-loop control strategy to enable the offshore platform converter valve to finish short-time unlocking operation by means of energy stored in the sub-module capacitor comprises the following steps:
the pole control system adopts an open-loop control strategy, a preset voltage reference wave is issued to the converter valve control system, and the valve control system conducts on and off control on the submodule IGBT to track the voltage reference wave;
and the pole control system sends a locking command to the converter valve, disconnects the corresponding isolating switch and closes the grounding switch.
Further, the preset test criteria include:
a. the AC voltage waveform output by the converter valve is consistent with a preset voltage reference wave issued by a pole control system;
b. the voltage of the capacitor of the converter valve submodule is balanced, the submodule power supply can be normally obtained, no submodule fault information exists, and no black module exists;
c. no protection tripping, no abnormal discharge, no lightning arrester action and no abnormality of a control system.
In a second aspect, the invention provides a passive unlocking test system for a converter valve wharf of an offshore platform, which comprises:
the charging module is used for charging the sub-module capacitor of the offshore platform converter valve through the test power supply of the marine foundation wharf, and disconnecting the wiring switch between the test power supply and the offshore platform converter valve after charging;
the short-time unlocking module is used for issuing a converter valve short-time unlocking command based on an open-loop control strategy so that the converter valve of the offshore platform completes short-time unlocking operation by means of energy stored in the sub-module capacitor;
and the test judging module is used for judging the operation data of the offshore platform converter valve during the short-time unlocking operation period based on preset test criteria and verifying the relevant performance of the offshore platform of the open-sea wind power flexible direct current sending system.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the invention realizes friendly charging and safe unlocking of the high-voltage and high-power converter valve through the low-voltage and small-capacity test power supply of the marine base so as to realize comprehensive verification of basic functions of the marine converter platform in advance before the marine converter platform reaches the marine station site, effectively avoids high repair cost of the marine converter platform, and has huge practical value and wide application prospect;
2. according to the invention, the data of the offshore platform converter valve during the short-time unlocking operation period are reasonably verified through test criteria, so that the full verification of the pole control performance, the valve control performance, the pole control and valve control interface, the insulation performance and the like of the offshore platform converter valve is realized;
therefore, the method can be widely applied to the field of field debugging of the open sea wind power through the flexible direct current sending system.
Drawings
Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Like reference numerals refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a flow chart of a passive unlocking test method for a converter valve wharf of an offshore platform according to an embodiment of the invention;
fig. 2 is a schematic diagram of a circuit for performing converter valve ac side charging on an offshore converter platform through a low-voltage and low-capacity power supply according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a circuit for charging a converter valve at a dc side of an offshore converter platform by a low-voltage and low-capacity power supply according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an open-loop control strategy adopted by a pole control system in the passive unlocking process of a converter valve in the embodiment of the invention;
FIG. 5 is a voltage reference wave U issued by a pole control system during passive unlocking of a converter valve according to an embodiment of the present invention refa 、U refb 、U refc With the alternating voltage U output by the converter valve va 、U vb 、U vc A waveform comparison graph;
the reference numerals in the figures are as follows:
1. a test power supply; 2. a protection switch cabinet; 3. a voltage regulating transformer; 4. a station transformer; 5. connecting a transformer; 6. a converter valve; 7. a step-up transformer; 8. a voltage doubler rectifier.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In some embodiments of the invention, a passive unlocking test method for a converter valve wharf of an offshore platform is provided, wherein a low-voltage and low-capacity test power supply of a marine base wharf is used for carrying out alternating current side charging or direct current side charging on a converter valve, and meanwhile, the converter valve charging power is prevented from exceeding the limit by controlling a voltage regulator and limiting the active charging cutting speed of a sub-module; disconnecting the test power supply incoming line switch after charging is finished, and issuing a short-time unlocking command of the converter valve based on an open-loop control strategy to enable the converter valve to finish short-time unlocking operation by means of energy stored in the sub-module capacitor; and finally, fully verifying the pole control performance, the valve control performance, the pole control and valve control interface, the insulation performance and the like of the offshore platform of the open-sea wind power flexible direct current sending system by judging the consistency of the alternating current voltage waveform output by the converter valve and the reference wave sent by the pole control system.
Correspondingly, in other embodiments of the invention, a passive unlocking test system for the converter valve wharf of the offshore platform is further provided.
Example 1
As shown in fig. 1, the embodiment provides a passive unlocking test method for an offshore platform converter valve wharf, which includes the following steps:
1) the method comprises the following steps that a submodule capacitor of the offshore platform converter valve is charged through a low-voltage and small-capacity test power supply of a marine foundation wharf, and a wiring switch between the test power supply and the offshore platform converter valve is disconnected after charging is finished;
2) issuing a short-time unlocking command of the converter valve based on an open-loop control strategy to enable the converter valve to finish short-time unlocking operation by means of energy stored in the sub-module capacitor;
3) and judging data acquired during the short-time unlocking operation of the converter valve based on preset test criteria, and fully verifying the pole control performance, the valve control performance, the pole control and valve control interface, the insulation performance and the like of the flexible direct current offshore platform.
Preferably, in step 1), the method for charging the sub-module capacitor of the converter valve of the offshore platform by using the low-voltage and low-capacity test power supply at the dock of the marine base comprises the following steps:
1.1) determining that a charging loop of the converter valve of the offshore platform is an alternating current side charging loop or a direct current side charging loop according to actual conditions, and switching on an alternating current or direct current incoming line switch between a low-voltage and small-capacity test power supply of a marine base wharf and the converter valve of the offshore platform.
As shown in fig. 2, when the charging circuit adopts an ac side charging circuit, the low voltage and low capacity test power supply at the dock of the marine base is connected to the ac side of the converter valve sequentially through the configured incoming line protection switch cabinet, voltage regulating transformer, station transformer and connecting transformer, thereby charging the single-bridge-arm sub-module of the converter valve by using the ac line voltage.
As shown in fig. 3, when the charging circuit adopts a dc-side charging circuit, the low-voltage and low-capacity test power supply at the dock of the marine base is connected to the dc side of the converter valve sequentially through the incoming line protection switch cabinet, the voltage regulating transformer, the step-up transformer and the voltage doubling rectifier, so as to charge the in-phase upper and lower bridge arm sub-modules of the converter valve with dc voltage.
Specifically, in fig. 2 and 3, u pa For the phase voltage of the upper bridge arm a of the converter valve u pb For the phase voltage of b phase of upper bridge arm of converter valve pc For the upper bridge arm c-phase voltage, i, of the converter valve pa For the phase a current of the upper bridge arm of the converter valve, i pb For the upper arm b-phase current of the converter valve, i pc For the c-phase current of the upper bridge arm of the converter valve, I dc Is a system direct current i va For coupling the transformer valve-side phase a current, i vb For coupling the transformer valve-side phase b-phase current, i vc For coupling the transformer valve-side c-phase current, u ca For connecting the voltage between the phase a and the phase c on the transformer valve side, u ab For connecting the voltage between the phase b and the phase a on the transformer valve side, u bc For connecting the phase-c and phase-b voltages on the transformer valve side, u na For the phase voltage of a of the lower bridge arm of the converter valve u nb For the phase voltage of b phase of lower bridge arm of converter valve u nc For the c-phase voltage of the lower bridge arm of the converter valve, i na For converter valve lower bridge arm phase a current, i nb For converter valve lower bridge arm b-phase current, i nc For the c-phase current of the lower bridge arm of the converter valve, U dc Is a flexible DC interelectrode voltage.
1.2) in the uncontrolled charging stage, the voltage of the alternating current side or the direct current side of the converter valve is controlled to reach a rated value from 0 to a preset first speed by controlling the voltage regulating transformer, so that the condition that the inlet wire protection switch cabinet is tripped due to the fact that the charging power exceeds the capacity of the test power supply is avoided.
Wherein, the preset first rate is selected according to actual needs, and the preferred range is 20-30% U N Per minute, U N Is a voltage rating.
1.3) in the active charging stage, the converter valve submodules are controlled to be sequentially cut off in turn at a preset second speed, so that the capacitor voltage of each submodule rises to a rated value at a preset third speed, and the condition that the incoming line protection switch cabinet is tripped due to the fact that the charging power exceeds the capacity of a test power supply is avoided.
The preset second rate is selected according to actual needs, and may be, for example, 2 to 4/second.
And 1.4) disconnecting an alternating current or direct current incoming switch between the low-voltage and small-capacity test power supply and the offshore platform converter valve after the charging process is finished.
Preferably, in step 2), when the offshore platform converter valve is disconnected from the low-voltage and small-capacity test power supply at the marine base dock, a short-time unlocking command is sent to the converter valve through the pole control system, so that the converter valve completes short-time unlocking operation by means of energy stored in the sub-module capacitor, and the specific operation method is as follows:
and 2.1) the pole control system adopts an open-loop control strategy to send a preset voltage reference wave to the converter valve control system, and the valve control system conducts on-off control on the IGBT in the converter valve sub-module to track the voltage reference wave.
As shown in FIG. 4, in the open-loop control strategy, U vq For coupling the equivalent q-axis component, U, of the voltage at the valve side of the transformer vd Connecting the equivalent d-axis component of the voltage on the valve side of the transformer, wherein f is the system frequency; to U vq And U vd After the coordinate system conversion is carried out, a voltage reference wave U issued by the polar control system to the valve control system is obtained refa 、U refb 、U refc 。
2.2) the pole control system sends a locking command to the converter valve, corresponding isolating switches are disconnected, grounding switches are connected, and the converter valve enters short-time unlocking.
Preferably, in step 3), the preset test criterion includes:
a. the AC voltage waveform output by the converter valve is consistent with the voltage reference wave issued by the pole control system;
b. the voltage of the capacitor of the converter valve submodule is balanced, the submodule power supply can be normally obtained, no submodule fault information exists, and no black module exists;
c. no protection tripping, no abnormal discharge, no lightning arrester action and no abnormality of a control system.
Example 2
To further verify the effectiveness and feasibility of example 1, example 1 is further illustrated by this example: a simulation model of direct-current side charging of a flexible direct-current converter valve with the direct-current voltage of +/-400 kV through a low-voltage and small-capacity power supply is established in electromagnetic transient simulation software of a power system, the capacity of a test power supply is set to be 5MVA, the direct-current voltage rising speed is limited to be 3kV/s by controlling a regulating transformer, the cutting speed of a converter valve sub-module in the active charging stage is limited to be 1/500 ms, the test power supply is disconnected after charging is finished, and a 500ms passive unlocking instruction is issued to the converter valve.
As shown in fig. 5, during the passive unlocking period of the converter valve, the voltage reference wave U issued by the pole control system refa 、U refb 、U refc With the alternating voltage U output by the converter valve va 、U vb 、U vc The waveforms are consistent, which shows that the functions of the pole control, the valve control and the interface thereof are good, and the insulation performance of the equipment is also verified in the process.
The embodiment shows that the passive unlocking test method for the converter valve wharf of the offshore platform can utilize a low-voltage and small-capacity test power supply of a marine base to realize friendly charging and safe unlocking of a high-voltage and high-power converter valve, so that comprehensive verification of basic functions of the offshore platform can be realized in advance before the offshore platform reaches an offshore station site, high repair cost of the offshore platform is effectively avoided, and the offshore platform has great practical value and wide application prospect.
Example 3
The embodiment 1 provides a passive unlocking test method for an offshore platform converter valve wharf, and correspondingly, the embodiment provides a passive unlocking test system for the offshore platform converter valve wharf. The system provided by this embodiment can implement the passive unlocking test method for the converter valve wharf of the offshore platform in embodiment 1, and the system can be implemented by software, hardware or a combination of software and hardware. For example, the system may comprise integrated or separate functional modules or functional units to perform the corresponding steps in the methods of embodiment 1. Since the system of this embodiment is substantially similar to the method embodiment, the description process of this embodiment is relatively simple, and reference may be made to part of the description of embodiment 1 for relevant points.
The passive unblock test system of offshore platform converter valve pier that this embodiment provided includes:
the charging module is used for charging the offshore platform converter valve through a low-voltage and small-capacity test power supply of the marine base wharf, and disconnecting a wiring switch of the test power supply after charging is finished;
the unlocking module is used for issuing a short-time unlocking command of the converter valve based on an open-loop control strategy so that the converter valve completes short-time unlocking operation by means of energy stored in the sub-module capacitor;
and the test judging module is used for judging data during unlocking operation based on preset test criteria and fully verifying the pole control performance, the valve control performance, the pole control and valve control interface, the insulation performance and the like of the flexible direct current offshore platform.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A passive unlocking test method for an offshore platform converter valve wharf is characterized by comprising the following steps:
the method comprises the steps that a sub-module capacitor of the offshore platform converter valve is charged through a test power supply of a marine foundation wharf, and a wiring switch between the test power supply and the offshore platform converter valve is disconnected after charging is finished;
issuing a converter valve short-time unlocking command based on an open-loop control strategy to enable the offshore platform converter valve to finish short-time unlocking operation by means of energy stored in the sub-module capacitor;
operation data of the offshore platform converter valve during short-time unlocking operation are judged based on preset test criteria, and relevant performance of the offshore platform of the open-sea wind power flexible direct current sending-out system is verified.
2. The passive unlocking test method for the converter valve wharf of the offshore platform according to claim 1, characterized by comprising the following steps of: the method for charging the sub-module capacitor of the converter valve of the offshore platform through the test power supply of the marine base wharf comprises the following steps:
determining a charging loop of the converter valve of the offshore platform as an alternating current side charging loop or a direct current side charging loop;
in the uncontrolled charging stage, controlling the voltage of the alternating current side or the voltage of the direct current side of the converter valve to rise to a rated value from 0 according to a preset first rate;
and in the active charging stage, controlling the sub-modules of the converter valve to be sequentially cut off at a preset second rate in turn, so that the capacitor voltage of each sub-module is increased to a rated value at a preset third rate.
3. The passive unlocking test method for the converter valve wharf of the offshore platform according to claim 2, characterized in that: the alternating current side charging loop is as follows: a test power supply of the marine foundation wharf is connected with the alternating current side of the converter valve through the incoming line protection switch cabinet, the voltage regulating transformer, the station transformer and the connecting transformer in sequence, and the single-bridge-arm submodule is charged by using the alternating current line voltage.
4. The passive unlocking test method for the converter valve wharf of the offshore platform according to claim 2, characterized in that: the direct current side charging loop is as follows: a test power supply of the marine foundation wharf is connected with the direct current side of the flexible direct current converter valve through the incoming line protection switch cabinet, the voltage regulating transformer, the boosting transformer and the voltage doubling rectifier in sequence, and the in-phase upper bridge arm submodule and the in-phase lower bridge arm submodule are charged by using direct current voltage.
5. The passive unlocking test method for the converter valve wharf of the offshore platform according to claim 2, characterized in that: the range of the preset first rate is 20-30% U N Per minute, U N Is the voltage rating.
6. The passive unlocking test method for the converter valve wharf of the offshore platform according to claim 2, characterized in that: the preset second rate is 2-4/sec.
7. The passive unlocking test method for the converter valve wharf of the offshore platform according to claim 1, characterized by comprising the following steps of: the method for issuing the short-time unlocking command of the converter valve based on the open-loop control strategy to enable the converter valve of the offshore platform to finish short-time unlocking operation by means of energy stored in the sub-module capacitor comprises the following steps:
the pole control system adopts an open-loop control strategy, a preset voltage reference wave is issued to the converter valve control system, and the valve control system conducts on and off control on the submodule IGBT to track the voltage reference wave;
and the pole control system sends a locking command to the converter valve, disconnects the corresponding isolating switch and closes the grounding switch.
8. The passive unlocking test method for the converter valve wharf of the offshore platform according to claim 7, characterized in that: the preset test criteria comprise:
a. the AC voltage waveform output by the converter valve is consistent with a preset voltage reference wave issued by the pole control system;
b. the voltage of the capacitor of the converter valve submodule is balanced, the submodule power supply can be normally obtained, no submodule fault information exists, and no black module exists;
c. no protection tripping, no abnormal discharge, no lightning arrester action and no abnormality of a control system.
9. The utility model provides a passive unblock test system of offshore platform converter valve pier which characterized in that includes:
the charging module is used for charging the sub-module capacitor of the offshore platform converter valve through the test power supply of the marine foundation wharf, and disconnecting the wiring switch between the test power supply and the offshore platform converter valve after charging;
the short-time unlocking module is used for issuing a converter valve short-time unlocking command based on an open-loop control strategy so that the offshore platform converter valve can finish short-time unlocking operation by means of energy stored in the sub-module capacitor;
and the test judging module is used for judging the operation data of the offshore platform converter valve during the short-time unlocking operation period based on preset test criteria and verifying the relevant performance of the offshore platform of the open-sea wind power flexible direct current sending system.
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Effective date of registration: 20221206 Address after: 102209 Beijing Changping District Beiqijia future science and Technology North District Power Grid Corp office area Patentee after: STATE GRID ECONOMIC AND TECHNOLOGICAL RESEARCH INSTITUTE CO. LTD.B412, STATE GRID OFFICE Patentee after: BEIJING WANGLIAN DC ENGINEERING & TECHNOLOGY CO.,LTD. Address before: 102209 State Grid office area b407, North District of future science and Technology City, Changping District, Beijing Patentee before: STATE GRID ECONOMIC AND TECHNOLOGICAL RESEARCH INSTITUTE CO. LTD.B412, STATE GRID OFFICE |