CN102230948A - Active high voltage direct current switch oscillation loop parameter on-line measuring system and method thereof - Google Patents

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

Active formula high voltage direct current switch oscillation circuit Parameter Measuring system and method thereof

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 formula 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, China's direct current transportation Study on Technology has obtained the progress of advancing by leaps and bounds, at present domestic put into operation ± the 500kV DC engineering have ten surplus.The DC engineering that China plans to put into operation before the year two thousand twenty will be above 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 DC transmission engineering current conversion station, and it mainly acts on is to change the method for operation of straight-flow system and in time remove the fault that occurs in the circuit.So far, the method that the dc switch designing institute in HVDC (High Voltage Direct Current) transmission system adopts is based on the basis of alternating-current switch, will be converted to the conversion electric current of current zero by the steady current of alternating-current switch by various measures.Utilize the designed direct current of traditional alternating-current switch to cut-off scheme like this, can reach the effect of cut-offfing big 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 current domestic each big current conversion station installing 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, and minimizing accident, standard are to the operational management of direct supply, and State Grid Corporation of China has formulated enterprise's regulation and standards such as " DC power system equipment evaluation and analysis standards ".At present,,, the service work of dc switch oscillation circuit is failed effectively to carry out, brought hidden danger to safety in production in default of reliable technique means and advanced equipment and device newly putting into operation current conversion station handing-over and having moved in the service work at station.

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 bigger.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, earlier the capacitor C both end voltage is charged to about 300V, 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, finished 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 of calculating inductance L and resistance R according to the test current waveform is to know the capacitor value of capacitor C, and generally is to use multimeter estimation capacitance during site test, and this also brings error for precision of calculating.

2, when building the test loop, must dispose devices such as pressure regulator and rectifier, owing to whole dc circuit breaker is mounted on the 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 the discharge loop, must be from a connector of the oscillation circuit lead of dismantling, this test method wiring is comparatively loaded down with trivial details, needs the staff scene to ascend a height and disconnects lead; More seriously, because the inductance and the resistance of the lead self that inserts, can have a strong impact on the inductance that calculated and the validity and the accuracy of resistance value.

3, entire test must be carried out under the state of off-line, the waveform and the result calculated that cause measuring all lack real-time, the interrupting process and the operation conditions that can not reflect DC interruption effectively, the while has also influenced the reliability and the energy availability of DC transmission system.

Up to the present, the surveying instrument of dc switch all is to carry out in testing laboratory and manufacturer, and its relevant testing tool all is to adopt " manual intervention calculating ".Employing equipment mainly is 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 alternating current of its generation and the DC current on the 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 because the long-term outdoor charging operation of these equipment, some might take place and change in its parameter, thereby cause the break performance of dc switch to change, and finally influence its safe and stable operation.Therefore must measure to judge the switch performances quality these parameters.

In the existing checking experiment scheme, the special instrument of utilization or measure the occurrence of R, L, C in the dc switch oscillation circuit with specific test method respectively when current conversion station overhauls.Also having a kind of dc switch offline parameter measuring method need go here and there the people in the loop divides flowmeter to test.The shortcoming of these methods is:

1, these methods all are off-lines, only when overhauling, current conversion station carries out, in the current conversion station normal course of operation, can't learn these values, and in case when wherein some parameter is owing 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 bigger.

3, existing dc switch offline parameter experiment with measuring need be untied dc switch oscillation circuit connecting line.

4, existing dc switch offline parameter experiment with measuring need add very long extended line and will divide flowmeter to import in the dc switch oscillation circuit.Since inductance parameters itself very little (the tens μ H orders of magnitude) in the oscillation circuit, 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 experiment with measuring, 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 carry out on-line measurement to high voltage direct current switch oscillation circuit parameter, therefore the long-term hanging net operation of device that can not permission will directly measure R, L, these parameters of C is so must adopt other measuring technique to ask for the value of R, L, C indirectly.Therefore, purpose of the present invention just is to overcome the shortcoming and defect that prior art exists, and a kind of active formula high voltage direct current switch oscillation circuit Parameter Measuring system and method thereof are provided.The present invention only need know the initial value of two ends charging voltage on the dc switch and the electric current in the oscillation circuit, just can online calculate the value of corresponding R, L, C by genetic algorithm.

The object of the present invention is achieved like this:

One, active formula high voltage direct current switch oscillation circuit Parameter Measuring system (abbreviation system)

Native system is core with PAC, with Hall current sensor as collecting device, with GPRS as means of communication, with solar panel, accumulator and DC voltage converter working power as device, by the GPRS wireless transmission signal that collects is transferred on the background PC computer and stores, thereby realized on-line monitoring active formula high voltage direct current switch oscillation circuit electric current.

The preposition collecting part and the hop that comprises signal of system, collecting part is made up of Hall element and PAC capture card, and tcp data segment is finished by GPRS, and data send to after the backstage, calculate 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, constitute power supply;

The DC voltage converter is connected with PAC, sensor and GPRS module respectively, realizes power supply;

Sensor, PAC, GPRS module are connected successively with background PC computer, 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 finish record to the oscillation circuit electric current, but adopt accurate more PAC and Hall current sensor to gather the electric current of oscillation circuit, and the current signal that collects is transferred to background PC computer, thereby realized the online detection of high voltage direct current switch oscillation circuit electric current by the GPRS Radio Transmission Technology.

Two, active formula high voltage direct current switch oscillation circuit Parameter Measuring method (abbreviation method)

This method is based on above-mentioned active formula 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 the current signal that collects is transferred to background PC computer by the GPRS wireless transport module, realize the online detection of high voltage direct current switch oscillation circuit electric current; Be that workbench programmes deal with data again with the background PC computer, promptly use genetic algorithm the current data that the backstage industrial computer receives analyzed, mainly comprise definite calculating object, coding, decoding, calculating fitness value, select, steps such as intersection, mutation operation, output result:

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 the oscillation circuit, L, C and voltage u, the current i to the t differentiate $\frac{\mathrm{du}}{\mathrm{dt}}=\frac{i}{C}+L\frac{d^{2}i}{{\mathrm{dt}}^2}+R\frac{\mathrm{di}}{\mathrm{dt}},$

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 the oscillation circuit, L, C and voltage u, the 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, so 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, the current i in the 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, carry out selection 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 then to export contemporary optimum individual and corresponding fitness;

J, EOP (end of program), output F _FitnessMaximum pairing individual coding and decode parameter a, b, θ, c.

In the above-mentioned steps, except that step 4., other step is general procedure.

The present invention has following advantage and good effect:

1, can the online at any time measurement head straight for R, L, the C parameter of closing in the oscillation circuit, 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 total system;

2, a large amount of workloads that reduce the parameter measurement of dc switch resolution element;

3, owing to R, L, C parameter can not remain unchanged always, but some fluctuations take place within the specific limits, the concrete condition of the DC current of Qie Duaning and for for the purpose of ensuring safety as required, 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 maintenance as early as possible, 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 fault rapidly, 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.

Among the 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;

Be connected with DC voltage converter 7 again with the controller for solar 5 that solar panel 4 is connected with accumulator 6 respectively;

DC voltage converter 7 is connected with PAC1, sensor 2 and GPRS module 3 respectively;

Sensor 2, PAC1, GPRS module 3 and background PC computer 8 are connected successively.

The application of native system is that the current output terminal with the input end of sensor 2 and oscillation circuit is connected.

2, functional block

1)PAC1

Described PAC1 selects German Beckhoff CX1020 type PC for use.

CX1020 can directly be connected bus terminal with the 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 has only 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 has 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 for use jumbo Hall current sensor (HDC10000HA) as measuring equipment.

HDC10000HA series Hall current sensor is a 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 module that receives and transmit data that described GPRS module 3 selects for use the grand electric company in Shenzhen to produce, its principle are to utilize the GPRS technology to realize the wireless transmission of data, and this device selects for use 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 for use.

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 for use 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 of modules that DC voltage can be changed into different big or small DC voltage grades.

Solar panel 4, controller for solar 5, accumulator 6 and DC voltage converter 7 constitute 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 gives sensor 2 power supplies, another exports 12V and gives the GPRS module 3 power supplies, and each equipment can both and not influence high-voltage electrical equipment on every side in operate as normal under the rated voltage like this.

8) background PC computer 8

Described background PC computer 8 is a kind of being used on the backstage to receive the industrial computer that GPRS module 3 sends data, and it can also handle and analyze except can receiving data data, thereby draws the value of each parameter of high voltage direct current switch oscillation circuit.

Two, method

1,1. 2. 3. about step

Carried out the experiment with measuring of multiple different DC charging electric pressure at the scene, 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 to gather 16.8 points each oscillation period, per two some acquisition interval are 10 μ s, can get T=168 μ s oscillation period.Can obtain oscillation period of current waveform according to the oscillation circuit current waveform,

So $T=2\mathrm{\π}\sqrt{\mathrm{LC}}=0.000168S$

For the oscillation circuit current equation

$i=\frac{{\mathrm{<figure-callout\; id="0"\; label="U"\; filenames="HDA0000050776140000021.png"\; state="\{\{state\}\}">U</figure-callout>}}_0}{\mathrm{\&omega;L}}{e}^{-\mathrm{\&delta;t}}\sin \mathrm{\&omega;t}$

Be provided with: a=U ₀/ ω L, b=δ,

So $i_0=\frac{{\mathrm{<figure-callout\; id="0"\; label="U"\; filenames="HDA0000050776140000021.png"\; state="\{\{state\}\}">U</figure-callout>}}_0}{\mathrm{\&omega;L}}=\frac{U_{o}T}{2\mathrm{\&pi;L}}=\frac{a}{\frac{32767}{10}}*\frac{50}{3.5}$

Get by δ t=bx $\mathrm{\&delta;}=\frac{\mathrm{bx}}{t}=\frac{b}{10*{10}^{-6}}=\frac{R}{2L}$

2,4. about step

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 preestablish PopSize, MaxGeneration, Pc, Pm, PopSize is the size of colony, be the quantity of contained individuality in the 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, so the oscillation circuit current equation becomes:

i＝ae ^-btsin(ωt+θ)+c

Start program (400) at first;

Step 1: a, b, θ, c are encoded (401), and every parameter length is 10, obtains length and be 40 initial population;

Because genetic algorithm can not directly be handled the data of separating of solution space, therefore before search, must be shown as the solution space argument table genotype string structure data---the gene string in hereditary space by coding.Represent individuality in the colony with binary radix because of going here and there, its allele is by { 0,1} represents.Each individual gene string is generated by random number in the initial population.

Coding (Initialize the first generation): establish a certain parameter range and be [X _Min, X _Max], be that the binary coding of k is represented this parameter with length, then it can produce 2 ^kPlant different codings, the pass of correspondence is in the time of can making parameter coding

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, then corresponding is decoded as

$X_{\min }+(\underset{i=1}{\overset{k}{\mathrm{\&Sigma;}}}{b}_i*2^{i-1})*\frac{X_{\max }-X_{\min }}{2^k-1}$

Step 3: calculate fitness value (403).The quality that genetic algorithm is only assessed individuality or separated with the fitness function value in the search evolutionary process is 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

$F_{\mathrm{fitness}}=1/\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}\left(\mathrm{fabs}(a*\exp (-b*X[i\left]\right)*\sin \left(X\right[i]*2*\mathrm{pi}/T+\mathrm{\&theta;})-Y[i]\right)$ Wherein T can be averaged by the image data peak separation and obtain;

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 big more big more 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.The selected colony that is used to raise up seed, random pair is selected crossover location i, exchanges the part on 2 gene string i the right, produces new individuality, has made up the advantage of its parent.

Step 7: variation (Mutation Operator) (407).Select some individualities at random, change the value of certain character in its gene string with certain probability.

Is step 8: (Generation judged in convergence?＜MaxGeneration) (408).With maximum evolutionary generation is basis for estimation, if current algebraically is set variation algebraically less than maximum, then continue since the new individual fitness of the second step cycle calculations, 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 per generation optimum individual and corresponding fitness (409) simultaneously; Current algebraically is set variation algebraically greater than maximum, and iteration stops, and exports F after the EOP (end of program) _FitnessMaximum pairing individual coding and decode 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

Carrying out a large amount of high voltage direct current switch oscillation circuit parameter testing tests with Pueraria lobota-last current conversion station scene, DC transmission engineering Ge Zhou Ba is example, and concrete grammar is as follows:

The preceding use earlier of experiment was put HIOKI 3532-50LCR tester in Japanese day hookup electric capacity and inductance is measured, and the 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 under off-line state, carry out, 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 is gathered (10V:32767), capacitor voltage at both ends signal use digital oscilloscope record.

Claims (2)

1. active formula high voltage direct current switch oscillation circuit parameter on-line system is characterized in that:

Comprise 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 with DC voltage converter (7) again with the controller for solar (5) that solar panel (4) is connected with accumulator (6) respectively, constitute power supply;

DC voltage converter (7) is connected with PAC (1), sensor (2) and GPRS module (3) respectively, realizes power supply;

Sensor (2), PAC (1), GPRS module (3) and background PC computer (8) are connected successively, realize collection, transmission and the processing of data.

2. based on a kind of active formula high voltage direct current switch oscillation circuit Parameter Measuring method of the described system of claim 1, it is characterized in that:

Gather the electric current of oscillation circuit by automation controller PAC able to programme and Hall current sensor, and the current signal that collects is transferred to background PC computer, realize the online detection of high voltage direct current switch oscillation circuit electric current by the GPRS wireless transport module; Be that workbench programmes deal with data again with the background PC computer:

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 the oscillation circuit, L, C and voltage u, the current i to the t differentiate $\frac{\mathrm{du}}{\mathrm{dt}}=\frac{i}{C}+L\frac{d^{2}i}{{\mathrm{dt}}^2}+R\frac{\mathrm{di}}{\mathrm{dt}},$

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 the oscillation circuit, L, C and voltage u, the 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, so 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, the current i in the oscillation circuit, use genetic algorithm and carry out the oscillation circuit parameter estimation, basic step is as follows:

A, beginning (400):

B, initialization population (401), it is 10 coding that a, b, θ, c are carried out each length, obtains initial 40 populations;

C, decoding (402) are decoded to initial population;

D, look for optimum individual (403);

E, calculating fitness value (404);

F, carry out selection operation (405);

G, carry out interlace operation (406);

H, carry out mutation operation (407);

Whether i, decision operation (408) judge algebraically greater than maximum algebraically, otherwise continue step (402) and export per generation optimum individual and corresponding fitness (409), are then to export contemporary optimum individual and corresponding fitness (410);

J, EOP (end of program) (411), output F _FitnessMaximum pairing individual coding and decode parameter a, b, θ, c.

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