CN113253013B - Low-pressure pressurization control method for converter valve of converter station - Google Patents
Low-pressure pressurization control method for converter valve of converter station Download PDFInfo
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- CN113253013B CN113253013B CN202110370327.8A CN202110370327A CN113253013B CN 113253013 B CN113253013 B CN 113253013B CN 202110370327 A CN202110370327 A CN 202110370327A CN 113253013 B CN113253013 B CN 113253013B
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- G—PHYSICS
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- 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
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- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
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Abstract
The invention provides a converter station converter valve low-voltage pressurization control method, wherein the voltage group sequence connected to a valve group depends on the phase sequence of the primary side of a converter transformer, the connection of the converter transformer is two, one is Y delta 1 or Y delta 11, and the voltage group sequence must be correctly set in a converter valve trigger control unit CFC to obtain correct trigger pulse; tracking the specific phase sequence of the converter transformer, comparing the connection mode of the converter transformer in the real-time system with the connection mode of a delta side bus of the valve, and comparing the connection mode with the setting in the CFC, if the connection mode is different from the setting in the CFC, updating the CFC program; the method can safely and quickly check the correctness of primary wiring of the converter valve, the correctness of trigger synchronous voltage of the converter valve, the correctness of trigger control voltage of the converter valve, and the relation between the phase sequence of the primary voltage and the trigger sequence of the valve group.
Description
Technical Field
The invention relates to the field of power transmission and transformation converter valves, in particular to a converter station converter valve low-voltage pressurization control method.
Background
Before the converter valve is charged at high voltage, a low-voltage pressurization test with a valve group of the converter transformer must be completed. The technical scheme aims at: checking the correctness of primary wiring of the converter valve, the correctness of trigger synchronous voltage of the converter valve, the correctness of trigger control voltage of the converter valve, and checking the relation between the phase sequence of the primary voltage and the trigger sequence of the valve group.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a converter station converter valve low-pressure pressurization control method.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a low-pressure pressurization control method for a converter valve of a converter station, which comprises the following steps of:
s1, preparation: the voltage group sequence connected to the valve group depends on the phase sequence of the primary side of the converter transformer, and the connection of the converter transformer has two types, one is Y delta 1 or Y delta 11, and the connection must be correctly set in a converter valve trigger control unit CFC to obtain correct trigger pulse; tracking the specific phase sequence of the converter transformer, comparing the connection mode of the converter transformer in the real-time system with the connection mode of a delta side bus of the valve, and comparing with the setting in the CFC, if the difference exists, updating the CFC program;
s2, calculation of main circuit:
in order to obtain the power supply capacity and the resistance value during working, the output direct current Id is required to be as small as possible on the premise that the output direct current Id can continuously pass through the thyristor valve, and Id is 3-6A;
the working voltage of the valve is as low as possible on the premise that the valve can be triggered in normal operation, U thyristor ＝200～400V；
U test Is the line voltage applied to the primary side of the converter transformer during the test;
U VN is the rated voltage of the converter transformer valve side;
U aCN is the rated voltage of the line side of the converter transformer;
the following approximate formula can be used:
R d ＝U d /I d(test)
P resistor ＝R d ·I d 2
And selecting proper resistors to be connected to the two sides of the silicon controlled valve according to the criterion, and ensuring that the capacity of the selected resistors meets the requirement.
Further comprising capacity calculation:
U test ＝2000V、I d(test) ＝3A、
U valveΔ ＝170.3kV、
U dΔ ＝643×1.3＝836V
Rd＝(836+836)/2A＝836Ω
P resistor ＝836×3 2 ＝7524W
and for the resistive load alpha being 60-120 degrees, the current is gradually reduced.
Also comprises a test temporary arrangement: in order to complete the low-voltage pressurization test, the settings related to a main circuit and software must be made in advance, and the minimum filter condition of the alternating current filter must be met under the condition that the connection of the alternating current filter is simulated in the test process;
temporary arrangement of the main circuit: the main circuit connection single line diagram comprises a first circuit and a second circuit, the first circuit and the second circuit are arranged in parallel, a first switch is installed on the first circuit, a first induction voltage regulator is installed on the second circuit, and a first boosting transformer is installed between the first circuit and the second circuit;
the first line is connected with a third line, the second line is connected with a fourth line, an auto-coupling voltage regulator is installed on the fourth line, and one end of the fourth line, which is away from the second line, is connected with CFC;
the third circuit is connected with a first converter transformer and a second converter transformer which are connected in parallel; the first converter transformer and the second converter transformer are connected with a converter valve, the converter valve is connected with a direct-current load resistor in parallel, and one end of the direct-current load resistor is connected with a first lightning arrester and a second switch in series; the other end of the direct current load resistor is connected with a second lightning arrester in series;
and a temporary grounding device is arranged between the converter valve and the direct current load resistor.
Temporary arrangement of the converter valve side: in each valve arm, only a single controllable silicon chip in one module is selected for testing; short-circuiting other silicon controlled valves by using a temporary short-circuit wire; for the measurement of the valve in the test, all test points of the valve can be connected to an insulation test terminal outside a valve group fence; the measurement points for the valve must be measured with a differential probe rated at about 700V;
a dc load resistor is connected between the pole and the neutral point and must be connected to ground during the test.
The temporary arrangement of a voltage loop from a CVT for measuring alternating voltage to the CFC comprises a second induction voltage regulator, one end of the second induction voltage regulator is connected with a 400V alternating current test power supply, the other end of the second induction voltage regulator is connected with a second boosting transformer and one end of an auto-coupling voltage regulator, the other end of the auto-coupling voltage regulator is connected with a CVT connecting box, the CVT connecting box is connected with the CVT, one end of the CVT is connected with an alternating current bus of a converter transformer, and the CVT connecting box is connected with a CFC unit; and a second switch is arranged on the alternating current bus which is connected with the second induction voltage regulator in parallel.
Also included is a temporary arrangement of control systems, including
The control signal of the valve is controlled by a CAN bus, and the following signals are required to be set at a signal transmitting terminal;
setting ENERGIZED to FALSE
Set TEST to FALSE
Confirming that the valve control unit has no alarm signal, checking and determining that no VCU _ IF or VCU _ FLT alarm exists in the application program SUP301 monitored by the Maincpu
CFC unit
The application CFC2 of Hidraw is turned on in debug mode, setting in reclev25.hgf to not read the signal from DPM and setting three signals INT _ MAX, INT _ MIN, INT _ OUT to 160 degrees. The required alpha angle command can now be obtained by changing the value of INT _ MAX;
sequence control
REQ: releasing the application of RSQRFO _ COM, setting the two signals RFO _ COMMON and RFO _ ACFILT output therein to be 1, and checking the state of RFO signal to be TRUE in RSQRFO.HGF;
SSQ: ENERGIZED is modeled as TRUE; DEENERGIZED is modeled as FALSE;
TCC: manually adjusting the tap to maximum;
BSQ: verifying that BLOCK _ ORDER is false, BPPO _ NORM is false, and CP _ OK is true; hgf RES _ BPPO signal should give an unlock indication in MSQ;
VBE, 500kV side:
signal from VBE to the polar control system: the VBE _ OK signal goes high; setting a valve unlocking signal to be at a high level;
current converter control: and debugging software EP3IBS adopting an EP3 plug-in is connected to a serial port on the EP3 plug-in.
Change trigger, 500kV side trigger control: deleting a line connected to the function block terminal CA _ C1-con20.xs, deleting a line connected to the function block terminal CA _ C1-con20.fr, and setting the function block terminal CA _ C1-con20.fr to 0, and simultaneously deleting a line connected to the function block terminal CA _ C1-con20.ll, and setting the function block terminal CA _ C1-con20.ll to 160 degrees, a trigger angle required on the 500kV side can be generated by changing the values of the function block terminal CA _ C1-con20. xs;
release of trigger pulse, 500kV side:
deleting the connection to CA _ C1-SB1501.ION with EP3IBS and setting CA _ C1-SB1501.ION to 1, the pulse will be sent to VBE;
tap control: and switching the tap control to manual control, and manually adjusting the tap gear to maximize the Udio value.
The beneficial effects of the invention are as follows: the method can safely and quickly check the correctness of primary wiring of the converter valve, the correctness of trigger synchronous voltage of the converter valve, the correctness of trigger control voltage of the converter valve, and the relation between the phase sequence of the primary voltage and the trigger sequence of the valve group.
Drawings
FIG. 1 shows the relationship of the waveforms Y of the valve side voltage, control pulse and trigger pulse of the present invention before Δ;
FIG. 2 shows the relationship Δ before Y between the waveforms of the valve side voltage, the control pulse and the trigger pulse according to the present invention;
FIG. 3 is a single line diagram of a main circuit connection;
FIG. 4 is a quad valve test measurement point;
fig. 5 is a voltage loop single line diagram of the CVT to CFC measuring an alternating voltage;
FIG. 6 is a test waveform 1 for a pole I low-end converter valve;
FIG. 7 is a test waveform 2 for a very I low end converter valve;
FIG. 8 is a very I low end converter valve test waveform 3;
FIG. 9 is a test waveform 4 for an extreme I low-end converter valve
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A converter station converter valve low-pressure pressurization control method comprises the following steps:
s1, preparation: the voltage group sequence connected to the valve group depends on the phase sequence of the primary side of the converter transformer, and the connection of the converter transformer has two types, one is Y delta 1 or Y delta 11, and the connection must be correctly set in a converter valve trigger control unit CFC to obtain correct trigger pulse; tracking the specific phase sequence of the converter transformer, comparing the connection mode of the converter transformer in the real-time system with the connection mode of a delta side bus of the valve, and comparing the connection mode with the setting in the CFC, if the connection mode is different from the setting in the CFC, updating the CFC program; please refer to fig. 1 and fig. 2;
s2, calculation of the main circuit:
in order to obtain the power supply capacity and the resistance value during working, the output direct current Id is required to be as small as possible on the premise that the output direct current Id can continuously pass through the silicon controlled valve, and the Id is 3-6A;
the working voltage of the valve is as high as possible under the premise that the valve can be triggered in normal operationPossibly small, U thyristor ＝200～400V；
U test Is the line voltage applied to the primary side of the converter transformer during the test;
U VN is the rated voltage of the converter transformer valve side;
U aCN is the rated voltage of the line side of the converter transformer;
the following approximation formula can be used:
R d ＝U d /I d(test)
P resistor ＝R d ·I d 2
And selecting proper resistors to be connected to the two sides of the silicon controlled valve according to the criterion, and ensuring that the capacity of the selected resistors meets the requirement.
Further comprising capacity calculation:
U test ＝2000V、I d(test) ＝3A、
U valveΔ ＝170.3kV、
U dΔ ＝643×1.3＝836V
Rd＝(836+836)/2A＝836Ω
P resistor ＝836×3 2 ＝7524W
and for the resistive load alpha being 60-120 degrees, the current is gradually reduced.
Generally, in the test, a 400V alternating current power supply, 1 induction voltage regulator and 1 step-up transformer are directly connected to the converter transformer circuit side to meet the voltage requirement of the conduction of the silicon controlled valve, and 1 self-coupling voltage regulator is required to supply CFC voltage.
Of particular note are: the phase sequence to the CFC is correct. The phase sequence corresponding relation between the secondary side of the auto-coupling voltage regulator and the primary side of the test power supply in the converter transformer needs to be correct. In addition, the phase angle difference between the step-up transformer and the autotransformer needs to be considered in the test results.
Regulating the on-load voltage regulator of a converter transformer to output the maximum valve-side voltage Udio
Also comprises a temporary test arrangement: in order to complete the low-voltage pressurization test, the settings related to a main circuit and software must be made in advance, and the minimum filter condition of the alternating current filter must be met under the condition that the connection of the alternating current filter is simulated in the test process;
temporary arrangement of the main circuit: the main circuit connection single line diagram comprises a first line 1 and a second line 2, the first line 1 and the second line 2 are arranged in parallel, a first switch 101 is installed on the first line 1, a first induction voltage regulator 201 is installed on the second line 2, and a first boost transformer 202 is installed between the first line 1 and the second line 2;
the first line 1 is connected with a third line 3, the second line 2 is connected with a fourth line 4, an auto-coupling voltage regulator 401 is installed on the fourth line 4, and one end of the fourth line 4, which is away from the second line 2, is connected with CFC;
a first converter transformer 301 and a second converter transformer 302 are connected to the third line 3, and the first converter transformer 301 and the second converter transformer 302 are connected in parallel; the first converter transformer 301 and the second converter transformer 302 are connected with a converter valve 303, the converter valve 303 is connected with a direct current load resistor 304 in parallel, and one end of the direct current load resistor 304 is connected with a first lightning arrester 307 and a second switch 306 in series; the other end of the direct current load resistor 304 is connected in series with a second lightning arrester 308;
a temporary grounding device 309 is installed between the converter valve 303 and the dc load resistor 304.
Temporary arrangement of the converter valve 303 side: in each valve arm, only selecting a single controllable silicon wafer in one module to carry out the test; other silicon controlled valves are short-circuited by a temporary short-circuit wire; for the measurement of the valve in the test, all test points of the valve can be connected to an insulation test terminal outside a valve group column; the measurement points for the valve must be measured with a differential probe rated at about 700V;
a dc load resistor is connected between the pole and the neutral point and must be grounded to the neutral point of the valve during the test.
Temporary arrangement of voltage loop from CVT measuring alternating voltage to CFC
The three-phase alternating current as the test power supply is connected with the CFC through the self-coupling voltage regulator and is connected with a secondary loop of the existing alternating voltage measuring device and the control system as much as possible.
The autotransformer is connected into the terminal box of the CVT as shown in figure 5
Regulating the output voltage of a voltage divider, typically 100V (line voltage)
Observing that the voltage of the bus side of the transformer on the OWS is the rated voltage
Confirming phase sequence of primary side and secondary side of self-coupling voltage regulator
The temporary arrangement of the voltage loop from the CVT measuring the ac voltage to the CFC comprises a second induction regulator 401, one end of the second induction regulator 401 is connected to the 400V ac test power supply, the other end of the second induction regulator 401 is connected to a second boost transformer 402 and one end of an auto-coupler regulator 403, the other end of the auto-coupler regulator 403 is connected to a CVT connection box 404, the CVT connection box 404 is connected to a CVT405, one end of the CVT405 is connected to the ac bus 6 of the converter transformer, and the CVT connection box 404 is connected to the CFC unit; and a second switch 406 is installed on an alternating current bus connected with the second induction voltage regulator 401 in parallel.
Referring to FIG. 4, temporary arrangement of converter valve side
In each valve arm, only a single controllable silicon chip in one module (a module comprising a plurality of thyristors which are connected in series and a reactance unit) is selected for testing; short-circuiting other silicon controlled valves by using a temporary short-circuit wire; for valve measurements under test, all test points of the valve (see fig. 4) can be connected to insulated test terminals outside the valve block barrier. The measurement points for the valve must be measured with a differential probe rated at about 700V.
A dc load resistor is connected between the pole and the neutral point. Grounding of the valve neutral point is necessary during the test.
Also included is a temporary arrangement of control systems, including
The control signal of the valve is controlled by a CAN bus, and the following signals are required to be set at a signal transmitting terminal;
setting ENERGIZED to FALSE
Set TEST to FALSE
Confirming that the valve control unit has no alarm signal, checking and determining that VCU _ IF or VCU _ FLT alarm does not exist in the application program SUP301 monitored by MainCpu
CFC unit
The application CFC2 of Hidraw is turned on in debug mode, setting in reclev25.hgf to not read the signal from DPM and setting three signals INT _ MAX, INT _ MIN, INT _ OUT to 160 degrees. The required alpha angle command can now be obtained by changing the value of INT _ MAX;
sequence control
REQ: releasing the application of RSQRFO _ COM, setting the two signals RFO _ COMMON and RFO _ ACFILT output therein to be 1, and checking the state of RFO signal to be TRUE in RSQRFO.HGF;
SSQ: ENERGIZED is modeled as TRUE; DEENERGIZED was modeled as FALSE;
TCC: manually adjusting the tap to maximum;
BSQ: verifying that BLOCK _ ORDER is false, BPPO _ NORM is false, and CP _ OK is true; hgf RES _ BPPO signal should give an unlock indication in MSQ;
VBE, 500kV side:
signal sent by VBE to the polar control system: the VBE _ OK signal goes high; setting a valve unlocking signal to be at a high level;
current converter control: and debugging software EP3IBS adopting an EP3 plug-in is connected to a serial port on the EP3 plug-in.
Change trigger, 500kV side trigger control: deleting lines connected to the function block terminals CA _ C1-con20.xs, deleting lines connected to the function block terminals CA _ C1-con20.fr, setting the function block terminals CA _ C1-con20.fr to 0, simultaneously deleting lines connected to the function block terminals CA _ C1-con20.ll, and setting the function block terminals CA _ C1-con20.ll to 160 degrees, by changing values of the function block terminals CA _ C1-con20.xs, a trigger angle required on the 500kV side can be generated;
the values of the function block terminal inputs and the resulting firing angles are related as follows:
calculating the formula: flip angle (100-XS) × 0.90.
| Input value | Corresponding firing angle value | Remarks to note |
| 0 | 90 degree | |
| 16.66667 | 75Degree of rotation | |
| 33.33333 | 60 degree | |
| 50.00000 | 45 degree | |
| 66.66667 | 30 degree | |
| 83.33333 | 15 degrees |
The measured firing angle and the set firing angle are consistent and stable, the firing pulse spacing should be 30 ° ± 1 °. If there are differences in the signals, it is checked whether the connection form YD11 of the converter transformer is set correctly in the software.
Release of trigger pulse, 500kV side:
deleting the connection to CA _ C1-SB1501.ION with EP3IBS and setting CA _ C1-SB1501.ION to 1, the pulse will be sent to VBE;
tap control: and switching the tap control to manual control, and manually adjusting the tap gear to maximize the Udio value.
The following protections are released on the display screen: all protection related to the test is Low DC voltage protection set1, Low DC voltage protection set2, Low AC voltage other side, Valve misfire other side, etc.
Standard and basis
The trigger function is checked based on the control pulse and the ac bus voltage.
Waveform diagrams of valve side voltage, control pulse and trigger pulse with reference to fig. 1 and 2
Test procedure
All quadruple valves and control systems must be checked one by one, and the test can be summarized in the following 3 sections:
checking the phase sequence between the ac bus voltage and the valve block voltage (without applying a trigger pulse);
checking the phase sequence between the AC bus voltage and the control pulse from the commutation trigger control system;
and checking the triggering sequence and the monitoring function of all converter valves one by one in real time.
Test procedure
A prepare the test on a temporary schedule
B, opening the grounding knife switch of the converter transformer and the grounding knife switch of the valve hall
C, connecting the test power supply and adjusting the induction voltage regulator to a proper voltage level to pressurize the converter transformer.
D, determining correct phase sequence and the phase sequence relation between the autotransformer and the secondary side of the temporary transformer
E checking the phase sequence of the voltage on the two sides of the AC busbar and the valve (without trigger pulse)
F adjusting the autotransformer to make the secondary side line voltage be 100V
G setting a control system of the converter to be in an operating state (when the test is finished, the other control system is switched to)
When H is needed, all the protection related to the test, such as the abnormal protection of direct current voltage, the protection of direct current line and the angle over-delay protection, etc., should be removed
I unlocking independently on OWS single side, if RFO condition can not be satisfied, RES _ BPPO can be set as 'FF' in PCIA application BSQ _ BPPO page, unlocking is carried out, ALPHA is selected to be equal to 90 deg. (changing ALPHA _ MAX value) and slowly reduced to 75 deg., 60 deg., 45 deg., 30 deg., 15 deg., voltage at each point on valve side is checked by oscilloscope (interference is reduced by isolation transformer preferably when oscilloscope is used)
J, completing the test, and repeating the steps to complete the low-pressure pressurization test of all the valve plates;
releasing all temporary arrangements
When the AC test voltage drops to zero, the test power supply is disconnected, and the grounding knife switch is closed.
The temporary cables for all valves are removed.
All autotransformers, CVT junction boxes, temporary cables to the CFC, and temporary connections in all other control systems are removed.
The computer software is reloaded.
Finally, all sites, devices, and software systems are checked to confirm that the "ad hoc" is removed.
Test items and results
Test results should be correctly filled into the test record form and associated records;
test results for extreme I low-end converter valve
TABLE 2
The above-mentioned embodiments only express the implementation manner of the present invention, and the description thereof is specific and detailed, but not to be understood as the limitation of the patent scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (7)
1. A converter station converter valve low-pressure pressurization control method is characterized by comprising the following steps:
s1, preparation: the voltage group sequence connected to the valve group depends on the phase sequence of the primary side of the converter transformer, the connection of the converter transformer has two types, one is Y delta 1 or Y delta 11, and the voltage group sequence must be correctly set in a converter valve trigger control unit CFC to obtain correct trigger pulse; tracking the specific phase sequence of the converter transformer, comparing the connection mode of the converter transformer in the real-time system with the connection mode of a delta side bus of the valve, and comparing the connection mode with the setting in the CFC, if the connection mode is different from the setting in the CFC, updating the CFC program;
s2, calculation of the main circuit:
in order to obtain the power supply capacity and the resistance value during working, the output direct current Id is required to be as small as possible on the premise that the output direct current Id can continuously pass through the silicon controlled valve, and the Id is 3-6A;
the working voltage of the valve is as low as possible on the premise that the valve can be triggered in normal operation, U thyristor ＝200～400V；
U test Is the line voltage applied to the primary side of the converter transformer during the test;
U VN is the rated voltage of the converter transformer valve side;
U aCN is the rated voltage of the line side of the converter transformer;
the following approximate formula can be used:
R d ＝U d /I d(test)
P resistor ＝R d ·I d 2
And selecting proper resistors to be connected to the two sides of the thyristor valve according to the criterion, and ensuring that the capacity of the selected resistors meets the requirement.
2. The method for low pressure pressurization control of converter valves of a converter station according to claim 1, further comprising capacity calculation:
U test ＝2000V、I d(test) ＝3A、
U valveΔ ＝170.3kV、
U dΔ ＝643×1.3＝836V
Rd＝(836+836)/2A＝836Ω
P resistor ＝836×3 2 ＝7524W
for resistive loads α of 60 ° to 120 °, the current is reduced stepwise.
3. The method for low pressure pressurization control of converter valves of a converter station according to claim 2, characterized in that it further comprises a test temporary arrangement: in order to complete the low-voltage pressurization test, the settings related to a main circuit and software must be made in advance, and the minimum filter condition of the alternating current filter must be met under the condition that the connection of the alternating current filter is simulated in the test process;
temporary arrangement of the main circuit: the single line diagram for the connection of the main circuit comprises a first line (1) and a second line (2), wherein the first line (1) and the second line (2) are arranged in parallel, a first switch (101) is installed on the first line (1), a first induction voltage regulator (201) is installed on the second line (2), and a first boost transformer (202) is installed between the first line (1) and the second line (2);
the first line (1) is connected with a third line (3), the second line (2) is connected with a fourth line (4), an auto-coupling voltage regulator (401) is installed on the fourth line (4), and one end, away from the second line (2), of the fourth line (4) is connected with CFC;
a first converter transformer (301) and a second converter transformer (302) are connected to the third line (3), and the first converter transformer (301) and the second converter transformer (302) are connected in parallel; the first converter transformer (301) and the second converter transformer (302) are connected with a converter valve (303), the converter valve (303) is connected with a direct current load resistor (304) in parallel, and one end of the direct current load resistor (304) is connected with a first lightning arrester (307) and a second switch (306) in series; the other end of the direct current load resistor (304) is connected with a second lightning arrester (308) in series;
a temporary grounding device (309) is arranged between the converter valve (303) and the direct current load resistor (304).
4. The converter station converter valve low-pressure pressurization control method according to claim 3, characterized in that: temporary arrangement of the converter valve (303) side: in each valve arm, only a single controllable silicon chip in one module is selected for testing; short-circuiting other silicon controlled valves by using a temporary short-circuit wire; for the measurement of the valve in the test, all test points of the valve can be connected to an insulation test terminal outside a valve group fence; the measurement points for the valve must be measured with a differential probe rated at about 700V;
a dc load resistor is connected between the pole and the neutral point and must be grounded to the neutral point of the valve during the test.
5. The low-pressure pressurization control method for the converter valves of the converter station according to claim 4, characterized in that: the temporary arrangement of the voltage loop from the CVT measuring the alternating voltage to the CFC comprises a second induction voltage regulator (401), one end of the second induction voltage regulator (401) is connected with the 400V alternating current test power supply, the other end of the second induction voltage regulator (401) is connected with one end of a second boosting transformer (402) and an auto-transformer (403), the other end of the auto-transformer (403) is connected with a CVT connecting box (404), the CVT connecting box (404) is connected with a CVT (405), one end of the CVT (405) is connected with an alternating current bus (6) of a converter transformer, and the CVT connecting box (404) is connected with the CFC unit; and a second switch (406) is arranged on an alternating current bus which is connected with the second induction voltage regulator (401) in parallel.
6. The method of claim 5, further comprising a temporary arrangement of control systems including
The control signal of the valve is controlled by a CAN bus, and the following signals are required to be set at a signal transmitting terminal;
ENERGIZED is set to FALSE
Set TEST to FALSE
Confirming that the valve control unit has no alarm signal, checking and determining that no VCU _ IF or VCU _ FLT alarm exists in the application program SUP301 monitored by the Maincpu
CFC unit
Opening an application program CFC2 of Hidraw in a debugging mode, setting signals not to be read from DPM in RECLEV25.HGF, and setting three signals INT _ MAX, INT _ MIN and INT _ OUT to 160 degrees; the required alpha angle command can now be obtained by changing the value of INT _ MAX;
sequence control
REQ: releasing the application of RSQRFO _ COM, setting the output two signals RFO _ COMMON and RFO _ ACFILT as 1, and checking the state of RFO signal as TRUE in RSQRFO.HGF;
SSQ: ENERGIZED is modeled as TRUE; DEENERGIZED was modeled as FALSE;
TCC: manually adjusting the tap to maximum;
BSQ: verifying that BLOCK _ ORDER is false, BPPO _ NORM is false, and CP _ OK is true; the RES _ BPPO signal of msqdebug. hgf should give an unlock indication in MSQ;
VBE, 500kV side:
signal sent by VBE to the polar control system: the VBE _ OK signal goes high; setting a valve unlocking signal to be at a high level;
current converter control: the debugging software EP3IBS adopting the EP3 plug-in is connected to a serial port on the EP3 plug-in.
7. The method for low-pressure pressurization control of converter valves of a converter station according to claim 6, characterized in that: change trigger, trigger control on the 500kV side: deleting a line connected to the function block terminal CA _ C1-con20.xs, deleting a line connected to the function block terminal CA _ C1-con20.fr, and setting the function block terminal CA _ C1-con20.fr to 0, and simultaneously deleting a line connected to the function block terminal CA _ C1-con20.ll, and setting the function block terminal CA _ C1-con20.ll to 160 degrees, a trigger angle required on the 500kV side can be generated by changing the values of the function block terminal CA _ C1-con20. xs;
release of trigger pulse, 500kV side:
deleting the connection to CA _ C1-SB1501.ION with EP3IBS and setting CA _ C1-SB1501.ION to 1, the pulse will be sent to VBE;
tap control: and switching the tap control to manual control, and manually adjusting the tap gear to maximize the Udio value.
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| CN101149421B (en) * | 2007-11-09 | 2010-06-02 | 中国电力科学研究院 | Direct current converter valve low voltage parameter operation test method |
| CN101726640B (en) * | 2009-12-23 | 2012-09-05 | 中国电力科学研究院 | Control and protection system of converter valve operating test device |
| CN101833055B (en) * | 2010-05-07 | 2013-05-08 | 国家电网公司直流建设分公司 | Method and system for testing low pressure increase of converter valve equipment |
| CN104181445A (en) * | 2014-08-12 | 2014-12-03 | 云南电力试验研究院（集团）有限公司电力研究院 | Converter transformer double side voltage applying partial discharge testing device and testing method thereof |
| CN105182103A (en) * | 2015-07-21 | 2015-12-23 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Converter transformer symmetrical voltage boosting no-load test circuit |
| CN204964637U (en) * | 2015-07-21 | 2016-01-13 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Converter transformer symmetry pressurization empty test circuit |
| CN110763960A (en) * | 2019-10-21 | 2020-02-07 | 国网湖北省电力有限公司电力科学研究院 | Self-lifting high-capacity partial discharge-free test transformer platform used in converter valve hall and test method |
| CN112269152A (en) * | 2020-10-29 | 2021-01-26 | 华北电力科学研究院有限责任公司 | Transformer and converter valve charging test circuit and method |
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