CN106026156A - Measured extinction angle detection method and detection system of DC power transmission system - Google Patents
Measured extinction angle detection method and detection system of DC power transmission system Download PDFInfo
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- CN106026156A CN106026156A CN201610414509.XA CN201610414509A CN106026156A CN 106026156 A CN106026156 A CN 106026156A CN 201610414509 A CN201610414509 A CN 201610414509A CN 106026156 A CN106026156 A CN 106026156A
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- blow
- angle
- converter valve
- out angle
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
-
- 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]
Abstract
The invention relates to a measured extinction angle detection method and detection system of a DC power transmission system. The detection method comprises the steps as follows: an electrical angle when current of a converter valve passes through a zero point and the electrical angle when synchronous voltage positively passes through the zero point are detected; the two electrical angles are subjected to integral treatment to obtain an extinction angle of the converter valve; and the minimum value in all extinction angles corresponding to the converter valve is found out. The minimum value is the required extinction angle. The measured extinction angle is a real extinction angle of the converter valve; control on the extinction angle is achieved through adjusting a trigger angle; and the measured extinction angle detection system has the characteristics of being high in instantaneity, high in reliability, high in accuracy, easy to implement and the like. Compared with a predicted extinction angle detection method, the measured extinction angle detection method has the advantages that the instantaneity is higher and the measured extinction angle detection method is more reliable and accurate. Furthermore, when subsequent control is carried out through the measured extinction angle obtained by the measured extinction angle detection method, the possibility of a commutation failure can be effectively prevented or reduced; and the control and operation reliability of the DC power transmission system is improved.
Description
Technical field
The present invention relates to DC transmission system actual measurement type blow-out angle detection method and detecting system, belong to direct current defeated
Electricity system blow-out angular measurement field.
Background technology
Along with increasing rapidly of China's economy and being continuously increased of power consumption demand, current China has become
The country most for DC power transmission line in the world, transmission capacity is maximum.And to the stability transmitted electric power
Requirement with reliability is also improving constantly, and in DC transmission engineering, commutation failure is DC transmission system
One of middle most common failure, occurs to cause DC voltage reduction, DC current to increase during converter valve commutation failure
Greatly, through-put power interrupt and increase current conversion station equipment stress, result even in straight-flow system generation locking,
Cause the paralysis of straight-flow system.
Commutation failure refers to when two valves carry out commutation, when commutation process does not has to be fully finished,
I.e. do not have to recover its ability blocked during backward voltage, the voltage in this converter valve ought be added in afterwards
For timing, converter valve is switched on the most again, then there occurs and switch phase, makes the converter valve weight that preparation turns on
, thus there is commutation failure in new shutoff.The reason causing commutation failure has inverter internal fault, the change of current
The decline of valve alternating voltage, inverter commutation voltage phase angle reach etc., but the most all can cause converter valve
Blow-out angle value is too small, and commutation failure occurs.So in the various strategies prevent commutation failure gamma kick
Particularly important, gamma kick method has forecasting type gamma kick and actual measurement type gamma kick two kinds realization
Method.At present, major part engineering is in order to save equipment cost many employings forecasting type gamma kick method, i.e.
According to the basic commutation formula that DC transmission system is theoretical, become inlet wire electricity according to the DC current measured and the change of current
Blow-out angle is predicted calculating by pressure, is adjusted controlling to Trigger Angle according to predictive value.This forecasting type puts out
The blow-out angle that arc angle control method uses is a predictive value, can there is certain deviation with actual value, so
Cause control system to trigger angle control can more delayed, accuracy is relatively low, and exist control deviation big with
Control the shortcomings such as time delay.
Summary of the invention
It is an object of the invention to provide a kind of DC transmission system actual measurement type blow-out angle detection method, in order to solve
Control deviation is there is and greatly and controls in the blow-out angle utilizing forecasting type blow-out angle measuring method to measure when controlling
The problem of the shortcomings such as time delay.The present invention also provides for a kind of DC transmission system actual measurement type blow-out angle detecting system.
For achieving the above object, the solution of the present invention includes: the inspection of a kind of DC transmission system actual measurement type blow-out angle
Survey method, comprises the following steps:
(1) for all of converter valve, electrical angle during each converter valve current zero-crossing point is detected, with
And electrical angle during synchronizing voltage positive going zeror crossing point；
(2) it is integrated above-mentioned two electrical angle processing the blow-out angle obtaining corresponding converter valve；
(3) finding the minima in blow-out angle corresponding to all of converter valve, this minima is required
Blow-out angle.
When by VBE the electric current of converter valve being acquired realizing described detection converter valve current zero-crossing point
Electrical angle；It is acquired realizing described detection synchronizing voltage forward to the voltage of converter valve by voltage transformer
Electrical angle during zero crossing.
Realize being integrated processing to above-mentioned two electrical angle and obtain this converter valve in described step (2)
The means at blow-out angle comprise the following steps:
1) current signal and voltage signal are carried out software for jitters elimination process；
2) judging whether the level rising edge of this current signal arrives, if arrived, starting integrator；
3) whether the level rising edge of detection synchronous voltage signal arrives, if arrived, stops integrator；
4) the blow-out angle of the corresponding inverter of output.
Before minima in finding blow-out angle corresponding to all of converter valve, in addition it is also necessary to carry out following behaviour
Making: judge whether blow-out angle corresponding to all of converter valve has calculated, if calculated, then reading institute
Some blow-out angles, and use minima lookup method to obtain critical extinction angle.
A kind of DC transmission system actual measurement type blow-out angle detecting system, including total processor and with converter valve one by one
Corresponding detection device, electric angle when described detection device includes for detecting corresponding converter valve current zero-crossing point
The current detection module of degree, for detecting corresponding converter valve synchronizing voltage positive going zeror crossing point time the electricity of electrical angle
Pressure detection module and divisional processing device；The sampling of described divisional processing device connects corresponding current detection module and electricity
Pressure detection module, all of divisional processing device is connected with described total processor；
Described divisional processing device is carried out for the signal collected according to current detection module and voltage detection module
Integral Processing obtains the blow-out angle of corresponding converter valve；Described total processor is for corresponding in all of converter valve
Blow-out finds minima in angle, and this minima is required blow-out angle.
Described current detection module is VBE, and described voltage detection module is voltage transformer.
Described divisional processing device is FPGA.
Described detection device also includes signal processing module, and it is single that signal processing module includes that current signal processes
Unit, voltage signal processing unit and level shifting circuit, described current signal processing unit is isolation coupling electricity
Road, described voltage signal processing unit is made up of the signal conditioning circuit being sequentially connected with and comparison circuit, compares
Circuit and the output of isolation coupling circuit connect level shifting circuit, and the voltage signal of voltage detection module output depends on
Secondary export to level shifting circuit through signal conditioning circuit and comparison circuit, the electric current of current detection module output
Signal exports to level shifting circuit through isolation coupling circuit, and level shifting circuit is defeated after processing signal
Go out to divisional processing device.
The work process of described total processor is:
1) each divisional processing device configuration parameter is given；
2) reading state word information；
3) error information is determined whether, if it is not, carry out step 4)；
4) judging whether blow-out angle corresponding to each converter valve has calculated, if calculated, then carrying out
Step 5)；
5) read each blow-out angle, use minima to search method and obtain critical extinction angle.
Actual measurement type gamma kick be by configure hardware device and hardware circuit to the electric current in converter valve and
Synchronizing voltage carries out timely collection, detection electric current and the zero crossing moment of voltage, obtains through integral operation
To real-time actual measurement blow-out angle value, gamma kick use this actual measurement blow-out angle value carry out judgement process, complete
In pairs Trigger Angle regulate control in real time.Gamma kick uses actual measurement type blow-out angle method, measures
Being real converter valve blow-out angle to blow-out angle, such control system is realized blow-out angle by regulation Trigger Angle
Control there is high real-time, high reliability, high accuracy, the feature such as be easily achieved；And control system
Can in real time, accurately obtain the blow-out angle of converter valve, can quickly make regulation trigger angle control action,
Compared with the detection method of forecasting type blow-out angle, real-time is higher, relatively reliable, accurate.It addition, utilize real
The actual measurement blow-out angle that survey type blow-out angle detection method obtains is when carrying out follow-up control, can effectively prevent or
Reduce the probability of commutation failure, improve DC transmission system control and reliability of operation.
Accompanying drawing explanation
Fig. 1 is DC transmission system actual measurement type blow-out angle detecting system structural representation；
Fig. 2 is DC transmission system actual measurement type blow-out angle detecting system principle schematic；
Fig. 3 is FPGA work process schematic diagram；
Fig. 4 is the work process schematic diagram of CPU processor.
Detailed description of the invention
Embodiment of the method
The DC transmission system actual measurement type blow-out angle detection method that the present invention provides, generally comprises following step
Rapid:
(1) for all of converter valve, electrical angle during each converter valve current zero-crossing point is detected, with
And electrical angle during detection synchronizing voltage positive going zeror crossing point；
(2) it is integrated above-mentioned two electrical angle processing the blow-out angle obtaining corresponding converter valve；
(3) finding the minima in blow-out angle corresponding to all of converter valve, this minima is required
Blow-out angle.
Based on above-mentioned detection method, the present invention also provides for a kind of detecting system implementing above-mentioned detection method, should
Detecting system includes a total processor, also includes that several detect device, owing to relating in DC transmission system
And multiple converter valve, so, the corresponding detection device of each converter valve, for detecting corresponding converter valve
Blow-out angle.
As it is shown in figure 1, detect electrical angle when device includes for detecting corresponding converter valve current zero-crossing point
Current detection module, for detecting corresponding converter valve synchronizing voltage positive going zeror crossing point time the voltage inspection of electrical angle
Survey module and divisional processing device.Owing to the inverter side in generally DC transmission system uses blow-out angle
Control strategy, so, in this embodiment, detection device is that the converter valve to inverter side carries out the detection of blow-out angle.
In the present embodiment, current detection module is the VBE (change of current valve control system) of primary side, voltage
Detection module is PT equipment (voltage transformer), and divisional processing device is FPGA.It addition, total processor is
Control chip or the industrial computers etc. such as CPU processor, such as single-chip microcomputer control equipment.
Can parallel logic operation, the speed of service soon and program owing to FPGA (PLD) has
The advantage such as flexibly, so, use FPGA processor as actual measurement type blow-out angular measurement in detection device
Master controller.
FPGA controller sampling connects VBE (change of current valve control system) and PT equipment (voltage transformer),
Further, the FPGA controller in all detection devices is connected with CPU processor.
VBE is for detection and the current signal gathering corresponding converter valve, and PT is used for detecting and gather correspondence and changes
The voltage signal of stream valve.Signal in order to detect the two detection module processes, and this detecting system is also
Including signal processing module, as illustrated in fig. 1 and 2, signal processing module include current signal processing unit,
Voltage signal processing unit and level shifting circuit, voltage signal processing unit is by the signal condition being sequentially connected with
Circuit and comparison circuit are constituted, and current signal processing unit is isolation coupling circuit, comparison circuit and isolation coupling
Closing circuit output and connect level shifting circuit, the voltage signal of PT output is successively through signal conditioning circuit and ratio
Relatively circuit exports to level shifting circuit, and the current signal of VBE output exports to level through isolation coupling circuit
Change-over circuit, level shifting circuit exports to FPGA after processing signal.
The processing unit that VBE (converter valve controller) device is corresponding converter valve electric current is carried out magnitude conversion and
Acquisition process, synchronizing voltage is converted by the processing unit using PT (voltage transformer) device corresponding
And process, it is transformed to secondary side measuring system manageable small voltage signal.Wherein, the hardware in system
Voltage signal processing unit carries out signal condition to synchronous voltage signal amount, including operation amplifier, holding, with
The function point analysis such as amiable filtering；Synchronous voltage signal amount, after signal condition, carries out modulus through comparator
Conversion, is converted to digital quantity by analog quantity, completes the detection of semaphore zero crossing；Afterwards through level conversion
Circuit carries out level conversion to semaphore, and Transistor-Transistor Logic level is converted to FPGA processor acceptable
COMS level.Current signal processing unit carries out coupling protection to converter valve electric current, is turned by measurement semaphore
It is changed to the standard signal of-5V to 5V that detecting system can identify.
It is to say, electric current and the synchronizing voltage of inverter converter valve are carried out by detecting system by hardware circuit
Signal condition and signals collecting, primary side VBE (change of current valve control system) and PT (voltage transformer)
Electric current and the synchronizing voltage of inverter converter valve are acquired by equipment, after being then passed through respective handling, and conversion
For delivering to FPGA by hard-wired mode after low magnitude semaphore.
FPGA carries out voltage and current mistake according to the electric current received and voltage signal in FPGA processor
The detection of zero point moment and judgement, calculate the blow-out angle value producing each converter valve by internal integrator.
FPGA processor internal work flow process figure is as shown in Figure 3.Inside FPGA to input electric current/
Voltage signal carries out software for jitters elimination process, filters the shake of signal；In host process, moment cycle criterion signal
Measuring the rising edge of level, the rising edge arrival moment is the semaphore zero crossing moment.When waiting time-out, the most defeated
Go out error information；Otherwise arrive the moment (converter valve turns off the moment) at converter valve rise-time of current, in starting
Portion's integrator is integrated.Meanwhile, in synchronizing voltage detection procedure, ceaselessly detecting synchronizing voltage zero passage
The arrival of point (positive going zeror crossing point).When detecting that synchronizing voltage zero crossing arrives, stop internal integrator,
Calculate the blow-out angle that output integration obtains.
CPU obtains, from FPGA, the blow-out angle that each converter valve is corresponding, obtains through minima lookup algorithm
Little blow-out angle value.
CPU mainly completes the interface with host computer, and completes overall control.As shown in Figure 4, in the present invention
In measuring method, CPU mainly completes the parameter configuration about actual measurement type blow-out angular measurement, and reading state word is believed
Breath, if do not reported an error, and receives the blow-out angle that FPGA sends and calculates after complement mark, from FPGA
Read blow-out angle, use minima lookup algorithm to find out critical extinction angle, and by the blow-out angle of each converter valve
Export with critical extinction angle.
System embodiment
The detecting system that the present invention provides has provided detailed description, the most no longer in said method embodiment
Illustrate.
It is presented above specific embodiment, but the present invention is not limited to described embodiment.This
Bright basic ideas are above-mentioned basic scheme, for those of ordinary skill in the art, according to the present invention's
Teaching, designs the model of various deformation, formula, parameter are not required to spend creative work.Do not taking off
The change that in the case of the principle and spirit of the present invention, embodiment carried out, revise, replace and modification still
Fall within the scope of protection of the present invention.
Claims (9)
1. a DC transmission system actual measurement type blow-out angle detection method, it is characterised in that include following step
Rapid:
(1) for all of converter valve, electrical angle during each converter valve current zero-crossing point is detected, with
And electrical angle during synchronizing voltage positive going zeror crossing point；
(2) it is integrated above-mentioned two electrical angle processing the blow-out angle obtaining corresponding converter valve；
(3) finding the minima in blow-out angle corresponding to all of converter valve, this minima is required
Blow-out angle.
DC transmission system actual measurement type blow-out angle the most according to claim 1 detection method, its feature
It is, when the electric current of converter valve being acquired realizing described detection converter valve current zero-crossing point by VBE
Electrical angle；It is acquired just realizing described detection synchronizing voltage to the voltage of converter valve by voltage transformer
Electrical angle when zero crossing.
DC transmission system actual measurement type blow-out angle the most according to claim 1 detection method, its feature
It is, it is achieved above-mentioned two electrical angle is integrated process obtains this converter valve in described step (2)
The means at blow-out angle comprise the following steps:
1) current signal and voltage signal are carried out software for jitters elimination process；
2) judging whether the level rising edge of this current signal arrives, if arrived, starting integrator；
3) whether the level rising edge of detection synchronous voltage signal arrives, if arrived, stops integrator；
4) the blow-out angle of the corresponding inverter of output.
DC transmission system actual measurement type blow-out angle the most according to claim 1 detection method, its feature
It is, before the minima in finding blow-out angle corresponding to all of converter valve, in addition it is also necessary to carry out following behaviour
Making: judge whether blow-out angle corresponding to all of converter valve has calculated, if calculated, then reading institute
Some blow-out angles, and use minima lookup method to obtain critical extinction angle.
5. a DC transmission system actual measurement type blow-out angle detecting system, it is characterised in that include always processing
Device and detect device with converter valve one to one, described detection device includes for detecting corresponding converter valve electricity
The current detection module of electrical angle when flowing through zero point, for detecting corresponding converter valve synchronizing voltage positive going zeror crossing
The voltage detection module of electrical angle during point and divisional processing device；The sampling of described divisional processing device connects corresponding
Current detection module and voltage detection module, all of divisional processing device is connected with described total processor；
Described divisional processing device is carried out for the signal collected according to current detection module and voltage detection module
Integral Processing obtains the blow-out angle of corresponding converter valve；Described total processor is for corresponding in all of converter valve
Blow-out finds minima in angle, and this minima is required blow-out angle.
DC transmission system actual measurement type blow-out angle the most according to claim 5 detecting system, its feature
Being, described current detection module is VBE, and described voltage detection module is voltage transformer.
DC transmission system actual measurement type blow-out angle the most according to claim 5 detecting system, its feature
Being, described divisional processing device is FPGA.
DC transmission system actual measurement type blow-out angle the most according to claim 5 detecting system, its feature
Being, described detection device also includes signal processing module, and it is single that signal processing module includes that current signal processes
Unit, voltage signal processing unit and level shifting circuit, described current signal processing unit is isolation coupling electricity
Road, described voltage signal processing unit is made up of the signal conditioning circuit being sequentially connected with and comparison circuit, compares
Circuit and the output of isolation coupling circuit connect level shifting circuit, and the voltage signal of voltage detection module output depends on
Secondary export to level shifting circuit through signal conditioning circuit and comparison circuit, the electric current of current detection module output
Signal exports to level shifting circuit through isolation coupling circuit, and level shifting circuit is defeated after processing signal
Go out to divisional processing device.
DC transmission system actual measurement type blow-out angle the most according to claim 5 detecting system, its feature
Being, the work process of described total processor is:
1) each divisional processing device configuration parameter is given；
2) reading state word information；
3) error information is determined whether, if it is not, carry out step 4)；
4) judging whether blow-out angle corresponding to each converter valve has calculated, if calculated, then carrying out
Step 5)；
5) read each blow-out angle, use minima to search method and obtain critical extinction angle.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787896A (en) * | 2017-03-02 | 2017-05-31 | 南方电网科学研究院有限责任公司 | Avoid blow-out angular measurement abnormal circuit and avoid direct current transportation commutation failure circuit |
| CN107516907A (en) * | 2017-06-30 | 2017-12-26 | 中国西电电气股份有限公司 | A kind of triggering system blow-out angle detection method based on valve step voltage |
| CN110988522A (en) * | 2019-11-13 | 2020-04-10 | 许昌许继风电科技有限公司 | Generator for converter arc-quenching angle margin test and detection method |
| CN112564157A (en) * | 2020-12-15 | 2021-03-26 | 深圳供电局有限公司 | Fixed extinction angle control improvement method for inhibiting continuous commutation failure |
| CN112701676A (en) * | 2020-12-15 | 2021-04-23 | 深圳供电局有限公司 | Arc-quenching angle prediction and commutation failure suppression method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787896A (en) * | 2017-03-02 | 2017-05-31 | 南方电网科学研究院有限责任公司 | Avoid blow-out angular measurement abnormal circuit and avoid direct current transportation commutation failure circuit |
| CN107516907A (en) * | 2017-06-30 | 2017-12-26 | 中国西电电气股份有限公司 | A kind of triggering system blow-out angle detection method based on valve step voltage |
| CN107516907B (en) * | 2017-06-30 | 2021-08-17 | 西安西电电力系统有限公司 | Trigger system arc-quenching angle detection method based on valve-level voltage |
| CN110988522A (en) * | 2019-11-13 | 2020-04-10 | 许昌许继风电科技有限公司 | Generator for converter arc-quenching angle margin test and detection method |
| CN110988522B (en) * | 2019-11-13 | 2021-11-19 | 许昌许继风电科技有限公司 | Generator for converter arc-quenching angle margin test and detection method |
| CN112564157A (en) * | 2020-12-15 | 2021-03-26 | 深圳供电局有限公司 | Fixed extinction angle control improvement method for inhibiting continuous commutation failure |
| CN112701676A (en) * | 2020-12-15 | 2021-04-23 | 深圳供电局有限公司 | Arc-quenching angle prediction and commutation failure suppression method |
| CN112564157B (en) * | 2020-12-15 | 2023-12-26 | 深圳供电局有限公司 | Fixed arc extinguishing angle control improvement method for inhibiting continuous commutation failure |
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