CN102230948B - Active high voltage direct current switch oscillation loop parameter on-line measuring system and method thereof - Google Patents
Active high voltage direct current switch oscillation loop parameter on-line measuring system and method thereof Download PDFInfo
- Publication number
- CN102230948B CN102230948B CN 201110065039 CN201110065039A CN102230948B CN 102230948 B CN102230948 B CN 102230948B CN 201110065039 CN201110065039 CN 201110065039 CN 201110065039 A CN201110065039 A CN 201110065039A CN 102230948 B CN102230948 B CN 102230948B
- Authority
- CN
- China
- Prior art keywords
- oscillation circuit
- current
- voltage
- direct current
- switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000010355 oscillation Effects 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000005540 biological transmission Effects 0.000 claims abstract description 17
- 230000002068 genetic effect Effects 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 230000035772 mutation Effects 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 claims description 2
- 238000006467 substitution reaction Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 7
- 230000007774 longterm Effects 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- 230000006641 stabilisation Effects 0.000 abstract 2
- 238000011105 stabilization Methods 0.000 abstract 2
- 238000012360 testing method Methods 0.000 description 22
- 238000005259 measurement Methods 0.000 description 10
- 239000003990 capacitor Substances 0.000 description 9
- YQNRVGJCPCNMKT-JLPGSUDCSA-N 2-(4-benzylpiperazin-1-yl)-n-[(2-hydroxy-3-prop-2-enyl-phenyl)methylideneamino]acetamide Chemical compound OC1=C(CC=C)C=CC=C1\C=N/NC(=O)CN1CCN(CC=2C=CC=CC=2)CC1 YQNRVGJCPCNMKT-JLPGSUDCSA-N 0.000 description 6
- 101001139126 Homo sapiens Krueppel-like factor 6 Proteins 0.000 description 6
- 101001133600 Homo sapiens Pituitary adenylate cyclase-activating polypeptide type I receptor Proteins 0.000 description 6
- 101001080401 Homo sapiens Proteasome assembly chaperone 1 Proteins 0.000 description 6
- 102100020679 Krueppel-like factor 6 Human genes 0.000 description 6
- 229960005552 PAC-1 Drugs 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 108090000623 proteins and genes Proteins 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 101150028074 2 gene Proteins 0.000 description 1
- UJTMIRNFEXKGMS-ZMIZWQJLSA-N 2-carboxy-D-arabinitol 1-phosphate Chemical compound OC[C@@H](O)[C@@H](O)[C@@](O)(C(O)=O)COP(O)(O)=O UJTMIRNFEXKGMS-ZMIZWQJLSA-N 0.000 description 1
- 108700028369 Alleles Proteins 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 230000005355 Hall effect Effects 0.000 description 1
- 241000219780 Pueraria Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000010429 evolutionary process Effects 0.000 description 1
- 238000010353 genetic engineering Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000000700 radioactive tracer Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Abstract
The invention discloses an active high voltage direct current switch oscillation loop parameter on-line measuring system and a method thereof, relating to high voltage direct current switch oscillation loop parameter measuring technology. In the invention, oscillation loop current is collected through a programmable automation controller PAC and a Hall current sensor, and a collected current signal is transmitted to a background PC machine through a GPRS wireless transmission module to realize on-line detection of high voltage switch oscillation loop current; then the background PC machine as a workbench carries out programming to process data, i.e. genetic algorithm is applied to analyze the current data received by a background industrial control computer. According to the invention, R, L, and C parameters of the direct current switch oscillation loop can be measured on line at any time to guarantee stabilization of current waveform generated by the oscillation loop, and ensure a long-term reliable operation of a direct current power transmission system and safety and stabilization of the whole system.
Description
Technical field
The present invention relates to a kind of high-voltage direct current switch oscillation circuit parameter measurement technology, particularly relate to a kind of active high voltage direct current switch oscillation circuit parameter [resistance (R), inductance (L), electric capacity (C)] on-line measurement system and method thereof.
Background technology
Since the end of the eighties, the research of China's HVDC Transmission Technology has obtained the progress of advancing by leaps and bounds, at present domestic put into operation ± the 500kV DC engineering has more than ten bars.The DC engineering that China plans to put into operation before the year two thousand twenty will be over 30; Simultaneously, in order to realize " transferring electricity from the west to the east " strategy, country just carrying forward vigorously comprise ± 400kV, ± 660kV, ± 800kV and ± construction of 1000kV extra-high voltage direct-current transmission engineering, following direct current transportation will become the important component part of China's electrical network.
Dc switch is one of visual plant of HVDC Converter Stations, and its Main Function is to change the method for operation of straight-flow system and in time remove the fault that occurs in circuit.So far, the method that the dc switch design in HVDC (High Voltage Direct Current) transmission system is adopted is based on the basis of alternating-current switch, will be converted to by the steady current of alternating-current switch the conversion electric current of current zero by various measures.Utilize so the designed direct current of traditional alternating-current switch to cut-off scheme, can reach the effect of cut-offfing large electric current.Now typical high-voltage direct current switch has two kinds of passive dc switch and active type dc switchs.The dc switch of each large current conversion station installing of Present Domestic mainly contains metallic(return) circuit switch (MRTB), ground return circuit switch (GRTS), neutral bus switch (NBS) etc.
Power industry improves the operation of power networks level in order to strengthen the power transformation technical management, the minimizing accident, and the operational management of standard to direct supply, State Grid Corporation of China has formulated enterprise's regulation and standards such as " DC power system equipment evaluation and analysis standards ".At present, in the current conversion station that newly puts into operation joins and moved the service work at station, in default of reliable technological means and advanced equipments and device, the service work of dc switch oscillation circuit is failed effectively to carry out, brought hidden danger to safety in production.
The Hubei Province Electric Power Test Research Institute has proposed a kind of measuring method of oscillation circuit parameter, and has been widely applied in the site test of dc switch.This measuring method must be to carry out under the mode of off-line, and surveying work is comparatively loaded down with trivial details, and workload is larger.Fig. 1 is the circuit theory diagrams that traditional off-line type is measured MRTB (metallic(return) circuit switch) oscillation circuit parametric technique.
During site test, first the capacitor C both end voltage is charged to the 300V left and right, then disconnect the charge circuit switch SW, and closed oscillator switch S 1 and cut-off element S2 progressively, this moment, capacitor C was discharged by oscillation circuit, completed record to the oscillation circuit electric current by shunt resistance meter R and digital storage oscilloscope SBQ.
The weak point of above-mentioned measuring method is:
1, the prerequisite according to test current waveshape inductance L and resistance R is to know the capacitor value of capacitor C, and is generally to use multimeter estimation capacitance during site test, and this also brings error for precision of calculating.
2, when building the test loop, must configure the devices such as pressure regulator and rectifier, because whole dc circuit breaker is mounted on an insulated platform, thereby when giving capacitor C charging, need to go between from the two ends of capacitor C; Simultaneously for shunt resistance meter R is concatenated in discharge loop, must be from a connector of the oscillation circuit wire of dismantling, this test method wiring is comparatively loaded down with trivial details, needs the staff scene to ascend a height and disconnects wire; More seriously, due to inductance and the resistance of wire self of access, can have a strong impact on the inductance that calculates and validity and the accuracy of resistance value.
3, whole process of the test must be carried out under the state of off-line, cause the waveform measured and the result of calculating all to lack real-time, interrupting process and the operation conditions that can not effectively reflect DC interruption, the while has also affected reliability and the energy availability of DC transmission system.
Up to the present, the surveying instrument of dc switch is all to carry out in testing laboratory and manufacturer, and its relevant testing tool is all to adopt " manual intervention calculating ".Employing equipment is mainly large-scale charging set, direct current cabinet, battery pack, millisecond meter and wave tracer etc.
R, L, C oscillation circuit are the cores of dc switch, superpose by the alternating current of its generation and the DC current on circuit, thereby make last total current waveform that zero crossing be arranged, and so just can come extinguish arcs according to the alternating-current switch arc quenching principle.The arc extinction performance quality of dc switch is not only relevant with the mechanical property of switch, but also the amplitude frequency of the alternating current that produces with oscillation circuit is relevant, and the frequency amplitude of alternating current directly depends on R, L, C parameter.Therefore for guaranteeing the dc switch reliability service, its R, L, C parameter must tie in and maintain a long-term stability.But due to the long-term outdoor charging operation of these equipment, some might occur and change in its parameter, thereby cause the break performance of dc switch to change, and finally affect its safe and stable operation.Therefore must measure to judge to these parameters the performance quality of switch.
In existing checking experiment scheme, use special instrument or measure respectively the occurrence of R, L, C in the dc switch oscillation circuit with specific test method when current conversion station overhauls.Also having a kind of dc switch offline parameter measuring method need to go here and there the people in the loop divides flowmeter to test.The shortcoming of these methods is:
1, these methods are all off-lines, only when overhauling, current conversion station carries out, can't learn these values in the current conversion station normal course of operation, and in case when wherein some parameter is due to ageing equipment or some variations of superpotential impact generation, can't learn the concrete numerical value of its variation.
2, the dc switch resolution element is many, and the cycle of test is very long, and the manpower and materials of cost are larger.
3, existing dc switch offline parameter is measured test and need to be untied dc switch oscillation circuit connecting line.
4, existing dc switch offline parameter is measured test and need to be added very long extended line and will divide flowmeter to import in the dc switch oscillation circuit.Due to inductance parameters in oscillation circuit itself very little (the tens μ H orders of magnitude), and the lead inductance of increase extended line also has tens μ H inductance, can have a strong impact on measurement result like this.
5, existing dc switch offline parameter is measured test, and the parameter of calculated resistance R, inductance L and capacitor C is to adopt at first to suppose the capacitor C parameter constant, calculates the inductance L parameter according to the frequency meter of oscillating current.Envelope according to inductance L parameter and oscillating current calculates resistance parameter and then, with on-the-spot actual not in full conformity with.
Summary of the invention
Owing to will high-voltage direct current switch oscillation circuit parameter being carried out on-line measurement, therefore can not permission will carry out the directly long-term hanging net operation of device of measurement to R, L, these parameters of C, so must adopt other measuring technique indirectly to ask for the value of R, L, C.Therefore, purpose of the present invention just is to overcome the shortcoming and defect that prior art exists, and a kind of active high voltage direct current switch oscillation circuit Parameter Measuring system and method thereof are provided.The present invention only need to know the initial value of two ends charging voltage on dc switch and the electric current in oscillation circuit, just can online calculate by genetic algorithm the value of corresponding R, L, C.
The object of the present invention is achieved like this:
One, active high voltage direct current switch oscillation circuit Parameter Measuring system (abbreviation system)
Native system is take PAC as core, with Hall current sensor as collecting device, with GPRS as means of communication, with solar panel, accumulator and the DC voltage converter working power as device, by the GPRS wireless transmission, the signal that collects is transferred on background PC computer and stores, thereby realized on-line monitoring to active high voltage direct current switch oscillation circuit electric current.
Preposition collecting part and the hop that comprises signal of system, collecting part is comprised of Hall element and PAC capture card, and tcp data segment is completed by GPRS, after data send to the backstage, calculates R, L, C value through genetic algorithm.
Specifically, native system comprises PAC, sensor, GPRS module, solar panel, controller for solar, accumulator, DC voltage converter and background PC computer;
Be connected with the DC voltage converter again with the controller for solar that solar panel is connected with accumulator respectively, consist of power supply;
The DC voltage converter is connected with PAC, sensor and GPRS module respectively, realizes power supply;
Sensor, PAC, GPRS module are connected with background PC computer and are connected, and realize collection, transmission and the processing of data.
Measuring principle of the present invention:
With comparing of traditional off-line type, the present invention does not adopt shunt resistance meter and oscillograph to complete record to the oscillation circuit electric current, but adopt more accurate PAC and Hall current sensor to gather the electric current of oscillation circuit, and by the GPRS Radio Transmission Technology, the current signal transfer that collects is arrived background PC computer, thereby realized the online detection of high-voltage direct current switch oscillation circuit electric current.
Two, active high voltage direct current switch oscillation circuit Parameter Measuring method (abbreviation method)
This method is based on above-mentioned active high voltage direct current switch oscillation circuit Parameter Measuring system, gather the electric current of oscillation circuit by automation controller PAC able to programme and Hall current sensor, and by the GPRS wireless transport module, the current signal transfer that collects is arrived background PC computer, realize the online detection of high-voltage direct current switch oscillation circuit electric current; Programme deal with data take background PC computer as workbench again, namely use genetic algorithm the current data that the backstage industrial computer receives analyzed, mainly comprise definite calculating object, coding, decoding, calculating fitness value, select, the steps such as intersection, mutation operation, Output rusults:
1. for the dc switch oscillation circuit, using Kirchhoff's first law has:
u＝u
C+u
L+u
R，
U is for cut-offfing loop both end voltage, u
C, u
L, u
RBe respectively tank circuit inductance voltage, inductive drop and resistive voltage;
2. will
u
R=iR substitution u=u
C+ u
L+ u
R, and can get relation between R in oscillation circuit, L, C and voltage u, current i to the t differentiate
I is the oscillation circuit electric current, and R, L, C are respectively not Wei oscillation circuit resistance, inductance and electric capacity;
3. separating above-mentioned second-order equation gets
Be the relation between R in oscillation circuit, L, C and voltage u, current i, wherein
U
0For cut-offfing the initial voltage in loop;
Consider that gathering starting point is not actual waveform zero point and Hall element drift, add left and right displacement variable θ and upper and lower displacement variable c, therefore the oscillation circuit current equation becomes:
I=ae
-btSin (ω t+ θ)+c, wherein a=U
0/ ω L, b=δ;
4. by the relation between R, L, C and voltage u, current i in oscillation circuit, use genetic algorithm and carry out the oscillation circuit parameter estimation, basic step is as follows:
A, beginning:
B, initialization population, it is 10 coding that a, b, θ, c are carried out each length, obtains initial 40 populations;
C, decoding are decoded to initial population;
D, look for optimum individual;
E, calculating fitness value;
F, select the operation;
G, carry out interlace operation;
H, carry out mutation operation;
Whether i, decision operation judge algebraically greater than maximum algebraically, otherwise continue step and export per generation optimum individual and corresponding fitness, are to export contemporary optimum individual and corresponding fitness;
J, EOP (end of program), output F
FitnessMaximum corresponding individuality encode and decode and to get parameter a, b, θ, c.
In above-mentioned steps, except step 4., other step is general procedure.
The present invention has following advantages and good effect:
1, R, L, the C parameter of closing in oscillation circuit headed straight in on-line measurement at any time, can ensure that the current waveform that oscillation circuit produces keeps stable, has guaranteed the operation reliably and with long-term of DC transmission system and the safety and stability of whole system;
2, a large amount of workloads that reduce the parameter measurement of dc switch resolution element;
3, because R, L, C parameter can not remain unchanged always, but some fluctuations occur within the specific limits, the concrete condition of the DC current of cutting off as required and for for the purpose of ensuring safety, can set R, a L, C fluctuation range, when surpassing this scope, measurement mechanism gives a warning to dispatcher and on-the-spot operator on duty, arranges as early as possible maintenance, guarantees electrical network and device security;
4, when the measurement mechanism indication of dc switch has fault or switch to occur cutting off the fault of DC current, can carry out genetic algorithm by the voltage current waveform that record wave system system monitors calculates, find out the parameter situation of change of R, L, C, so that the field staff finds out rapidly fault, and the arrangement counter-measure, launch investigation.
Description of drawings
Fig. 1 is the circuit theory diagrams that traditional off-line type is measured MRTB oscillation circuit parameter;
Fig. 2 is the structural representation of native system;
Fig. 3 is charging voltage capture card measured current oscillogram when being 60V;
Fig. 4 utilizes genetic algorithm to carry out the program flow diagram of oscillation circuit parameter estimation.
In figure:
1-PAC; The 2-sensor; The 3-GPRS module;
The 4-solar panel; The 5-controller for solar; The 6-accumulator;
7-DC voltage converter; The 8-background PC computer.
C-electric capacity; SW-charge circuit switch; S1-oscillation circuit switch;
S2-cut-offs element; R-shunt resistance meter; The SBQ-digital storage oscilloscope;
The E-power supply.
, English to Chinese:
1, GPRS (General Packet Radio Service)-general packet radio service technology, it is a kind of mobile data services that the Global Link mobile phone user can use.
2, PAC-automation controller able to programme.
3, PLC-programmable controller.
4, MRTB-metallic(return) circuit switch.
Embodiment
Describe in detail below in conjunction with accompanying drawing and enforcement Lee example:
One, system
1, overall
As Fig. 2, native system comprises PAC1, sensor 2, GPRS module 3, solar panel 4, controller for solar 5, accumulator 6, DC voltage converter 7 and background PC computer 8;
The controller for solar 5 that is connected of being connected with accumulator with solar panel 4 respectively is connected with DC voltage converter 7 again;
The application of native system is the input end of sensor 2 to be connected current output terminal connect with oscillation circuit.
2, functional block
1)PAC1
Described PAC1 selects German Beckhoff CX1020 type PC.
CX1020 can directly connect bus terminal and EtherCAT terminal.CX1020 is equipped with 1GHz's
M CPU.It is an equipment of saving power consumption, can carry out work under extremely low core voltage, and its heat power consumption only has 7WTDP (TDP).So, the design of CX1020 built-in PC is very compact, does not also need to use fan.The basic CPU module of CX1020 standard configuration is with two RJ45 sockets and three integrated port switch.In actual applications, because this equipment has been arranged, so need not to use other switch to be configured the linear topology structure easily.So only need CX1020 just can realize the collection of data and the transmission control of GPRS wireless transmission.
2) sensor 2
Described sensor 2 selects jumbo Hall current sensor (HDC10000HA) as measuring equipment.
HDC10000HA series Hall current sensor is the current sensor of new generation of using the Hall effect principle, can measure the electric current of direct current, interchange, pulse and various irregular waveforms under electrically isolated condition.
3) the GPRS module 3
A kind of also module of the transmission of data that receives that described GPRS module 3 selects the grand electric company in Shenzhen to produce, its principle is to utilize the GPRS technology to realize the wireless transmission of data, this device selects multi-multipoint mode to carry out the transmission of data.
4) solar panel 4
The solar panels parallel running that it is 80W that described solar panel 4 is selected 2 power.
5) controller for solar 5
Described controller for solar 5 is a kind of modules of controlling the solar panel charged state, and accumulator is played charge protection and over.
6) accumulator 6
Described accumulator 6 selects the lead-acid accumulator of 2 voltage 12V, capacity 40AH to be formed in parallel.
7) the DC voltage converter 7
Described DC voltage converter 7 is a kind ofly DC voltage can be changed into the module of different big or small DC voltage grades.
Solar panel 4, controller for solar 5, accumulator 6 and DC voltage converter 7 consist of power supply, the 12V voltage that provides by accumulator 6, after 3 DC voltage converters 7, an output 24V powers to PAC1, another output ± 15V is to sensor 2 power supplies, another exports 12V to 3 power supplies of GPRS module, the high-voltage electrical equipment around each equipment can work under rated voltage and not affect like this.
8) background PC computer 8
Described background PC computer 8 is a kind of industrial computers that GPRS module 3 sends data that be used for to receive on the backstage, and it can also be processed and analyze data except can receive data, thereby draws the value of each parameter of high-voltage direct current switch oscillation circuit.
Two, method
1, about step 1. 2. 3.
Carried out at the scene the measurement test of multiple different DC charging electric pressure, the data (shown in Figure 3) when choosing voltage and being 60V are as the computational data of following algorithm.The capture card image data of frequency acquisition 100K following (intercepting switch motion partial data):
Y[50]＝[-4456，-6699，-7820，-7808，-6716，-4939，-2975，-823，1216，2929，3998，4458，4185，3404，2143，765，-657，-1760，-2568，-2887，-2789，-2218，-1414，-437，502，1307，1886，2112，2054，1659，1113，415，-246，-853，-1249，-1474，-1414，-1222，-789，-340，160，566，925，1069，1102，947，674，397，13，-254]
X[50]＝[1∶1∶50]
Can be got by above data and on average gather 16.8 points each oscillation period, every two some acquisition interval are 10 μ s, can get T=168 μ s oscillation period.Can obtain the oscillation period of current waveform according to the oscillation circuit current waveform,
Therefore
For the oscillation circuit current equation
Arrange: a=U
0/ ω L, b=δ,
Therefore
Got by δ t=bx
2, about step 4.
As Fig. 3, be to utilize genetic algorithm to carry out the program flow diagram of oscillation circuit parameter estimation.
Basic genetic algorithmic has 4 parameters, need to preset PopSize, MaxGeneration, Pc, Pm, PopSize is the size of colony, be the quantity of contained individuality in colony, generally being taken as 20～100.MaxGeneration is the termination evolutionary generation of genetic algorithm, generally is taken as 100～5000; Pc is the crossover probability of genetic algorithm, generally is taken as 0.4～0.99; Pm generally is taken as 0.001～0.05[8 for the variation probability].Calculate and select PopSize, MaxGeneration, Pc, Pm to be respectively 100,5000,0.05,0.02;
Consider that gathering starting point is not actual waveform zero point and Hall element drift, add left and right displacement variable θ and upper and lower displacement variable c, therefore the oscillation circuit current equation becomes:
i＝ae
-btsin(ωt+θ)+c
At first start program (400);
Step 1: a, b, θ, c are encoded (401), and every parameter length is 10, obtains length and be the initial population of 40;
Can not directly process the solution data of solution space due to genetic algorithm, therefore before search, must be shown as the solution space argument table by coding genotype string structure data---the gene string in hereditary space.Because going here and there to represent the individuality in colony, its allele is by { 0,1} represents with binary radix.In initial population, each individual gene string is generated by random number.
Coding (Initialize the first generation): the span of establishing a certain parameter is [X
min, X
max], the binary coding that is k with length represents this parameter, it can produce 2
kPlant different codings, pass corresponding in the time of can making parameter coding is
δ=(X wherein
max-X
min)/2
k-1.
Step 2: to initial population decode (402);
Decoding (Calculate Object Value): the b that is encoded to that supposes a certain individuality
kb
k-1b
k-2B
2b
1, correspondence is decoded as
Step 3: calculate fitness value (403).Genetic algorithm is only assessed the quality of individuality or solution with the fitness function value in the search evolutionary process, as the foundation of later genetic manipulation.Fitness function shows individual power to adaptive capacity to environment.Choosing fitness function according to the oscillating current equation is
Step 4: look for the poorest individuality of optimum (Find Best And Worst Individual) (404).Find out the poorest individuality of optimum by ideal adaptation degree value.
Step 5: select (Selection Operator) (405).The function that simulating nature is selected according to the larger larger principle of individual selected probability of fitness value, is selected good group of individuals and is kept, to raise up seed from current colony.
Step 6: intersect (Crossover Operator) (406).Interlace operation is topmost operation.Selected colony be used to raising up seed, random pair is selected crossover location i, exchange the part on the right of 2 gene string i, produces new individuality, has made up the advantage of its parent.
Step 7: variation (Mutation Operator) (407).Select at random some individualities, change the value of certain character in its gene string with certain probability.
Step 8: convergence judgement (Generation?＜MaxGeneration) (408).Take maximum evolutionary generation as basis for estimation, if current algebraically is set variation algebraically less than maximum, continue to begin the new individual fitness of cycle calculations from second step, estimate individual good and bad, so iteration is gone down, and the excellent genes of each colony accumulates gradually, and the average fitness value of colony and the fitness value of optimum individual constantly increase, optimum solution constantly restrains, and exports simultaneously per generation optimum individual and corresponding fitness (409); Current algebraically is set variation algebraically greater than maximum, and iteration stops, and exports F after EOP (end of program)
FitnessMaximum corresponding individuality encode and decode and to get parameter a, b, θ, c export contemporary optimum individual and corresponding fitness (410).
EOP (end of program) (411).
Working procedure gets following result:
1110011111100011000011110001110000001010 0.0001379061.583578 0.054741 2.969619 9.775171
Be that optimal sequence is 1110011111100011000011110001110000001010
Optimal-adaptive degree value 0.000137
a＝9061.583578 b＝0.054741 θ＝2.969619 c＝9.775171
Equally according to formula (4) (5) (6) this moment count according to R=0.44458, L=4.061e-005, C=1.76046e-005.Interpretation of result such as table 1.As seen the genetic algorithm error is less.
Table 1 oscillation circuit estimates of parameters and error analysis thereof
Three, testing experiment
So that Pueraria lobota-upward a large amount of high-voltage direct current switch oscillation circuit parameter testing tests is carried out as example in DC transmission engineering Gezhouba Converter Station scene, concrete grammar is as follows:
First use Japan day to put HIOKI 3532-50LCR tester before experiment hookup electric capacity and inductance are measured, result is: C=17.559 μ F, L=39.861 μ H, R=0.450 Ω.All tests were with conventional test methodologies was the same in the past, all carry out under off-line state, but adopt online method for parameter estimation to come the Processing Test data, site test as shown in Figure 2, wherein current oscillation signal uses Hall current sensor (50A:3.5V) to measure, and the PCI-20612 parallel data acquisition card that adopts Chengdu to open up general company gathers (10V:32767), capacitor voltage at both ends signal use digital oscilloscope record.
Claims (1)
1. the On-line Measuring Method of an active high voltage direct current switch oscillation circuit parameter on-line system, its system comprises PAC(1), sensor (2), GPRS module (3), solar panel (4), controller for solar (5), accumulator (6), DC voltage converter (7) and background PC computer (8);
Be connected 6 with solar panel (4) with accumulator respectively) controller for solar (5) that is connected is connected with DC voltage converter (7) again, consists of power supply;
DC voltage converter (7) respectively with PAC(1), sensor (2) is connected 3 with the GPRS module) be connected, realize power supply;
Sensor (2), PAC(1), GPRS module (3) is connected 8 with background PC computer) connect successively, realize collection, transmission and the processing of data;
Described PAC is automation controller able to programme;
It is characterized in that:
Pass through PAC(1) and sensor (2) gather the electric current of oscillation circuit, and by GPRS module (3), the current signal transfer that collects is arrived background PC computer (8), realize the online detection of high-voltage direct current switch oscillation circuit electric current, wherein sensor (2) is Hall current sensor; Programme deal with data take background PC computer as workbench again:
1. for the dc switch oscillation circuit, using Kirchhoff's first law has:
u＝u
C+u
L+u
R，
U is for cut-offfing loop both end voltage, u
C, u
L, u
RBe respectively tank circuit inductance voltage, inductive drop and resistive voltage;
2. will
u
R=iR substitution u=u
C+ u
L+ u
R, and can get relation between R in oscillation circuit, L, C and u, i to the t differentiate
I is the oscillation circuit electric current, and R, L, C are respectively oscillation circuit resistance, inductance and electric capacity;
3. separating above-mentioned second-order equation gets
Be the relation between R in oscillation circuit, L, C and u, i, wherein
U
0For cut-offfing the initial voltage in loop;
Consider that gathering starting point is not actual waveform zero point and Hall current sensor drift, add left and right displacement variable θ and upper and lower displacement variable c, therefore the oscillation circuit current equation becomes:
I=ae
-btSin (ω t+ θ)+c, wherein a=U
0/ ω L, b=δ;
4. by the relation between R, L, C and u, i in oscillation circuit, use genetic algorithm and carry out the oscillation circuit parameter estimation, basic step is as follows:
I, beginning (400);
II, initialization population (401), it is 10 coding that a, b, θ, c are carried out each length, obtains initial 40 populations;
III, decoding (402) are decoded to initial population;
IV, look for optimum individual (403);
V, calculating fitness value (404);
VI, select the operation (405);
VII, carry out interlace operation (406);
VIII, carry out mutation operation (407);
Whether IX, decision operation (408) judge algebraically greater than maximum algebraically, continue to carry out otherwise return to step III (402), export simultaneously per generation optimum individual and corresponding fitness (409), are to export contemporary optimum individual and corresponding fitness (410);
X, EOP (end of program) (411), output F
FitnessMaximum corresponding individuality encode and decode and to get parameter a, b, θ, c; Described F
FitnessBe the fitness function value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110065039 CN102230948B (en) | 2011-03-17 | 2011-03-17 | Active high voltage direct current switch oscillation loop parameter on-line measuring system and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110065039 CN102230948B (en) | 2011-03-17 | 2011-03-17 | Active high voltage direct current switch oscillation loop parameter on-line measuring system and method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102230948A CN102230948A (en) | 2011-11-02 |
| CN102230948B true CN102230948B (en) | 2013-06-05 |
Family
ID=44843535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110065039 Active CN102230948B (en) | 2011-03-17 | 2011-03-17 | Active high voltage direct current switch oscillation loop parameter on-line measuring system and method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102230948B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103217642A (en) * | 2013-03-06 | 2013-07-24 | 桂林电子科技大学 | Scan chain balance algorithm in system-on-chip (SoC) test based on evolutionary computation |
| CN103344911B (en) * | 2013-07-11 | 2015-12-23 | 武汉大学 | A kind of high-voltage direct-current switch disconnection overall process state identification method |
| US9638763B2 (en) * | 2013-12-31 | 2017-05-02 | Texas Instruments Incorporated | Resonant impedance sensing with a negative impedance control loop implemented with synchronized class D and output comparators |
| KR101569613B1 (en) * | 2014-04-14 | 2015-11-17 | 엘에스산전 주식회사 | System for measuring loss of HVDC |
| CN105467314A (en) * | 2016-01-26 | 2016-04-06 | 云南电网有限责任公司电力科学研究院 | High voltage DC isolation switch performance detection device |
| CN108957307B (en) * | 2018-07-12 | 2023-04-28 | 国网湖北省电力有限公司电力科学研究院 | DC change-over switch oscillation parameter measurement method based on multiple parameters |
| CN108931693A (en) * | 2018-07-13 | 2018-12-04 | 广东电网有限责任公司 | Optimization method, MCU and the nearly electric alarm device of resistance are adjusted in a kind of nearly electric alarm device |
| CN109541450A (en) * | 2018-11-19 | 2019-03-29 | 国网湖北省电力有限公司电力科学研究院 | A kind of dc switch oscillation circuit parameter measurement system and calculation method based on MATLAB |
| CN112327154A (en) * | 2020-11-09 | 2021-02-05 | 中国南方电网有限责任公司超高压输电公司昆明局 | Measuring device, measuring system and measuring method for direct current change-over switch of converter station |
| CN116338362B (en) * | 2023-05-19 | 2023-08-01 | 合肥航太电物理技术有限公司 | Double-exponential lightning current waveform generator parameter identification equipment and identification method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201233254Y (en) * | 2008-08-01 | 2009-05-06 | 重庆市电力公司江津供电局 | On-line monitoring instrument for throw of high-voltage transmission line |
| CN101551440B (en) * | 2009-05-15 | 2011-08-24 | 东北大学 | Generator transformer unit faults recorder analysis device |
| US9182256B2 (en) * | 2009-07-09 | 2015-11-10 | Rosemount Inc. | Process variable transmitter with two-wire process control loop diagnostics |
| CN201681143U (en) * | 2010-03-23 | 2010-12-22 | 西安工程大学 | Online monitoring device for mechanical characteristic of high-voltage circuit breaker |
| CN202041571U (en) * | 2011-03-17 | 2011-11-16 | 湖北省电力公司电力试验研究院 | Online high-voltage direct-current switch oscillation circuit current detection device based on GPRS (general pack radio service) |
| CN102156260B (en) * | 2011-03-17 | 2013-03-20 | 湖北省电力公司电力科学研究院 | System and method for evaluating status of oscillation circuit of active high-voltage direct-current switch |
-
2011
- 2011-03-17 CN CN 201110065039 patent/CN102230948B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN102230948A (en) | 2011-11-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102230948B (en) | Active high voltage direct current switch oscillation loop parameter on-line measuring system and method thereof | |
| CN102184209B (en) | Simulation data accessing method based on power grid CIM (Common Information Model) interface | |
| CN103454516B (en) | Intelligent transformer substation secondary equipment health state diagnostic method | |
| Senarathna et al. | Review of adaptive protection methods for microgrids. | |
| CN104155616A (en) | Photovoltaic system current transformer test platform | |
| CN102255330A (en) | Device and method for detecting island of micro power grid system | |
| CN102156260B (en) | System and method for evaluating status of oscillation circuit of active high-voltage direct-current switch | |
| CN103020726A (en) | All-PMU (phase measurement unit)-orientated robust state estimation method | |
| CN103413044A (en) | Substation measurement information based method for estimating local topology of electric power system | |
| CN105548781A (en) | Bus short-circuit capacity testing method, device and system | |
| CN103592528A (en) | Photovoltaic inverter model parameter identification method based on dynamic locus sensitivity | |
| CN103344911B (en) | A kind of high-voltage direct-current switch disconnection overall process state identification method | |
| CN110542822A (en) | method for measuring short-circuit current and short-circuit impedance of power grid based on reactive power disturbance | |
| CN109752629B (en) | Intelligent diagnosis method and system for power grid measurement problems | |
| Stewart et al. | Phasor Measurements for DistributionSystem Applications | |
| CN108896852B (en) | Online measurement method and system for short circuit capacity of public access point | |
| CN102590698A (en) | Small current grounding line selection device and control method of voltage disturbance locked line selection | |
| CN102496075A (en) | Memory-based online data integration method | |
| CN108494088A (en) | Consider the intelligent distribution type feeder automation terminal of ad hoc network equipment state | |
| CN202041571U (en) | Online high-voltage direct-current switch oscillation circuit current detection device based on GPRS (general pack radio service) | |
| CN103199507A (en) | Setting calculation extreme mode selecting method based on improved proximity set method | |
| CN107123062B (en) | Power distribution network operation risk control system | |
| Wang et al. | Experimental investigation on non detection zones of active frequency drift method for anti-islanding | |
| CN107546742B (en) | Day-ahead planned power flow active power and voltage calculation error analysis method | |
| Hussien et al. | Voltage sag mitigation using NAS battery-based standby power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: ELECTRIC POWER RESEARCH INSTITUTE OF HUBEI ELECTRI Free format text: FORMER OWNER: ELECTRIC POWER TEST + RESEARCH INSTITUTE OF HUBEI ELECTRIC POWER COMPANY Effective date: 20121120 Owner name: STATE GRID CORPORATION OF CHINA Effective date: 20121120 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20121120 Address after: 430077, 361 East Main Street, Wuchang District, Hubei, Wuhan Applicant after: Hubei Electric Power Research Institute of Power Company Applicant after: State Grid Corporation of China Address before: 430077 Hubei city of Wuhan province Wuchang Xudong Avenue No. 361 Applicant before: Hubei Electric Power Testing & Research Institute, Hubei Electric Power Company |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |