396 results about "Volt-ampere" patented technology

The invention relates to a method for recognizing parameters of asynchronous motor. The stator resistance of motor is measured by a method of DC volt-ampere. The rotor resistances as well as leakage inductance of stator and rotor of motor is obtained by short circuit test. Mutual inductance of stator and rotor of motor can be taken from method of no-load test. Compensating voltage drop in on state, switch time delay and dead time raises the accuracy and stability of recognized parameter. The resistance values of rotor at frequency of rating sliding difference are calculated by method of two points through test of locked rotor at two frequencies. Since skin effect is overcome, the resistance values of rotor are accurate enough so as to meet the requirement of vector control system completely.

The invention discloses a power-cell SOC online closed-loop estimation method based on an N-2RC model. In the invention, an electrochemical model and an equivalent circuit model are combined and a novel power cell model is provided. The N-2RC model uses a Nernst electrochemical model to replace an electromotive force portion of a second-order RC equivalent circuit model so that one to one correspondence of a cell electromotive force and SOC can be accurately reflected. Based on the model, a recursive least-square method based on a forgetting factor is used to identify a model parameter, and then an expansion Kalman filtering algorithm is used to realize on-line closed loop estimation of the cell SOC. The electrochemical model can well describe a cell characteristic on an electrochemical aspect, but the structure is complex and the model is not suitable for individually individual usage. And the equivalent circuit model belongs to an external characteristic model and can well express a volt-ampere characteristic relationship of the cell, but can not reflect an internal characteristic of the cell. By using the method in the invention, the above problems are overcome.

The present invention discloses a method of preparing active carbon material used for organic super capacitor from straw, which is characterized in that the active carbon material used for organic super capacitor is obtained by the processing steps of drying, smashing, carbonising and activation, using crop straw as raw material. The active carbon of the present invention has a big specific surface area, and a specific capacitance of 232 F / g at 2 mv / s which is tested by circular volt-ampere test using an electrolyte of MeEt3NBF4 / AN having a concentration of 1.2 mol / l, and is qualified as electrode material of organic super capacitor.

The invention provides a load-type monoatomic catalyst. The catalyst is formed by uniformly loading monodispersed metal atoms on the surface of a nano substrate material. A preparation method thereofcomprises the following steps: in an electrolyte solution containing metal salt, performing electrochemical deposition by using a three-electrode system, using a glassy carbon electrode loaded with the nano substrate material as a working electrode, using a graphite rod as a counter electrode, using a silver / silver chloride electrode as a reference electrode, performing linear volt-ampere scanning, enabling the metal atoms to be monodispersely and uniformly deposited on the nano substrate material, to obtain the load-type monoatomic catalyst. The load-type monoatomic catalyst is capable of, based on electro-deposition, constructing a monoatomic structure, through an electro-deposition method, rapidly, efficiently, and controllably depositing single atoms, and realizing deposition of positive and negative electrodes, and the obtained load-type monoatomic catalyst has important significance to a general application in the catalytic and particle physical field.

A system, method and product for modifying the volt-ampere reactive (VARs) in a power distribution system is provided. In one embodiment, the method includes determining the VARs at a location on the power distribution system and based on the determined VARs, determining whether to modify the VARs. If it is determined to modify the VARs the method includes identifying a plurality a capacitor banks connected to a power line and from the identified plurality of capacitor banks, generating a list of eligible capacitor banks that satisfy inclusion criteria. If the list of eligible capacitor banks includes at least one capacitor bank the method includes selecting a capacitor bank from the list of eligible capacitor banks and transmitting a switching command for the selected capacitor bank. Generating the list of eligible capacitor banks may include one or more of ensuring the voltage at each capacitor bank is not beyond a threshold, ensuring the total harmonic distortion at each capacitor bank is not beyond a threshold, ensuring the capacitor bank has not been switched within a recent predetermined time period, ensuring the capacitor bank has not been switched more than a predetermined number of times within a recent time period, ensuring that communications with each capacitor bank are viable, and other criteria.

The invention relates to a method for simultaneously detecting three antibiotic residues including streptomycin, chlorampenicol and tetracycline based on nucleic acid aptamers and quantum dots and belongs to the technical field of analytical chemistry. Three-section complementary cDNA 1 sequences are designed and synthesized and are complemented with three antibiotic aptamers DNA sequences and are further complemented with respective capturing probe DNA sequences of three antibiotics and complementary cDNA 2 sequence part. The three cDNAs 1 are first hybridized with aptamer DNAs supplemented with each other to form double-stranded DNAs. When target antibiotics exist in a sample, the aptamer DNAs are combined with corresponding antibiotics as a priority to cause the double-stranded DNAs to be de-hybridized and release cDNAs 1. The free cDNAs 1 are combined with capturing probe DNAs modified on the surface of a gold electrode, and cDNAs 2 modified with three quantum dots are hybridized with the other end of each cDNA 1. The three quantum dots on the surface of the gold electrode generate dissolution volt-ampere peaks corresponding to the target antibiotics. The three antibiotics are detected by utilizing the relations of changes of peak current values and antibiotic concentration. The method is good in repeatability and stability and high in sensitivity and can be used for directly measuring the three antibiotic residues in samples such as milk.

The invention relates to a method of controlling running of a modularized multi-level converter in a low frequency model, which belongs to the technical field of controlling multi-level power electronic converters. The method comprises the following steps: setting high frequency common mode voltage and high frequency ring current both required to be superimposed, revising a switching function of a submodule and bridge arm current, obtaining an expression of capacitance voltage differential coefficient of the submodule according to volt-ampere characteristics of capacitance of the submodule, and in order to allow the capacitance voltage of the submodule to only have high-frequency component, assuming high frequency common mode voltage is known to obtain a expression of the high frequency circular current; comparing a running frequency with a critical frequency to obtain frequency model selection signals, combining an energy control and a circular current control of a phase unit of the modularized multi-level converter, determining whether the high frequency common mode voltage and the high frequency circular current are required to be superimposed to an original instruction or not according to the frequency model selection signals, and generating voltage required to be superimposed in the bridge arm of the phase unit of the high frequency circular current by controlling. The method is easy to realize and strong in universality, and provides reference for low frequency application of the modularized multi-level converter.

The invention discloses a making method of proton exchange film fuel battery pile in the fuel battery technical domain, which comprises the following steps: (1) pressing plane MEA into wave shape under heating condition; (2) adopting micro-fine pushing technique to punch the hyperthin plane metal plate; punching the plate with hole into wave shape to mate wave-shaped MEA; obtaining monopole board; (3) adopting laser welding technique to weld a couple of monopole board into double-pole board; (4) plating a layer of conductive polyaniline on the metal surface through circulating volt-ampere method. The invention improves the reacting efficiency and energy density, which lightens the weight and resists corrosion.

The invention relates to a photovoltaic model establishment method applicable to the dynamic overall-process simulation of a power system. A photovoltaic generation module is modeled, a temperature factor and an illumination intensity factor in the medium and long-term process have the characteristics of fluctuation and indeterminacy, and an implementation method of a photovoltaic maximum power tracing model for the dynamic overall-process simulation of the power system is provided in consideration of the influence on photovoltaic generation caused by the change of the two factors. The photovoltaic maximum power tracing model adjusts the working voltage of a photovoltaic cell panel according to the volt-ampere characteristics of a photovoltaic power supply by using a maximum power point tracing control method, so that the photovoltaic cell panel can work in a maximum power output state, solar energy is utilized to the greatest extent, and the efficiency and performance of the photovoltaic generation are effectively improved. An inverter effectively controls the injection current of axes d and q by virtue of an inner ring current control loop and an outer ring current control loop, so that active power and reactive power can be controlled. The whole model meets requirements for electromechanical transient overall-process simulation and medium and long-term dynamic overall-process simulation of the power system.

The invention discloses a photovoltaic module output characteristic judgment method which is mainly characterized in that a single battery serves as a basic unit, output characteristics of a blocked battery and a battery string with the blocked battery are firstly analyzed according to current flowing through a photovoltaic module, and the conducting state of a bypass diode is further judged based on theoretical analysis for volt-ampere characteristics of the bypass diode, so that multimodal characteristics of the photovoltaic module blocked by shadow are calculated. By the method, the conducting point of the bypass diode can be accurately judged, so that peak points of an I-V curve of the module are accurately reflected, and a foundation is laid for simple and accurate simulation of the performance of the module under the condition of mismatch.

The invention discloses a method for testing insulation performance of insulator and a device thereof. The test method comprises the following steps: initializing zero value critical resistance R1 and low value critical resistance R2 of a tested insulator; exerting DC high voltage on the tested insulator under power-off state; collecting leakage current flowing through the tested insulator; calculating insulating resistance R by combining with volt-ampere method according to the exerted DC high voltage and collected leakage current obtained in the above steps; comparing the calculated insulating resistance R with zero value critical resistance R1 and low value critical resistance R2, then outputting the comparison result of the performance of the tested insulator. The test device comprises a high voltage power unit (1), a current collecting unit (2), and a processing unit (3). The invention has the advantages of broad application scope, applicability to on-site operation, intelligent measurement, rapid test, convenient operation, high measurement preciseness, abundant forms of output result, and good portability.

The invention discloses a performance degradation monitoring system for a photovoltaic cell. The system comprises a testing light source module, an I-V curve detection module, a channel switching module, a load loading module, a communication control unit and a processing terminal, wherein the I-V curve detection module detects a volt-ampere characteristic curve outwards output by the photovoltaic cell device; the processing terminal calculates the optimal load value of the maximum power point of the photovoltaic cell device according to the volt-ampere characteristic curve detected by the I-V curve detection module; the load loading module loads a load resistor of the corresponding resistance on the photovoltaic cell device according to the optimal load value. The load obtained by calculation is loaded on the detected photovoltaic cell device through the load loading module, and therefore the photovoltaic cell device does work outwards all the time in the testing process, the process better accords with actual situations of the photovoltaic cell device in the actual working process, and the degradation of the device in the actual working state is simulated more objectively and accurately.

The invention provides a GaAs solar energy cell performance degeneration prediction method in a space environment. The method comprises the following four steps: (1) establishment of a one-dimensional model of a GaAs solar energy cell in the space environment; (2) consideration of space particle radiation damage on an effective life of a carrier; (3) calculation of GaAs solar cell temperature; (4) realization of GaAs solar energy cell performance degeneration prediction through calculating a volt-ampere characteristic. According to the method, coupling effects of a space thermal vacuum environment and a radiation environment on the GaAs solar energy cell are considered, through establishing the one-dimensional model of the GaAs solar energy cell in the space environment, based on a minority continuity equation, degeneration case of the solar cell is analyzed and obtained through the volt-ampere characteristic. he invention has a practical value and a broad application prospect in the spatial solar cell electrical performance test technology field.

The invention discloses a preparation method for a metal nanometer / micrometer dendritic crystal ordered array. A conductive array substrate is used as a working electrode, an electrolyte comprises a metal salt solution and an additive with the dosage being 0-5% of the metal salt solution by molar concentration, and metal nanometer / micrometer dendritic crystals are electrically deposited on the surface of the substrate in a controlled mode through a volt-ampere method, so that the metal nanometer / micrometer dendritic crystal ordered array is obtained. The conductive array substrate is provided with an ordered conductive array, the additive comprises at least one of a complexing agent and a surfactant, and the additive is used for promoting the forming of the metal nanometer / micrometer dendritic crystals and regulating and controlling the morphology. According to the preparation method for the metal nanometer / micrometer dendritic crystal ordered array, the process is simple, operation is easy, the preparation time is short, efficiency is high, and the method is suitable for industrial production and application; and the obtained metal nanometer / micrometer dendritic crystal ordered array is controllable in shape, thickness and size.

The invention relates to a solar parameter extracting method based on a Lambert W function and polynomial fitting. The method includes: using the Lambert W function to perform manifestation and integration on a solar cell current output transcendental equation to obtain a manifestation integral equation; separating a solar cell current voltage output curve into three sections for fitting to obtain a sectional function; performing integration on the sectional function to obtain a sectional integral equation; selecting the measurement value on the solar cell volt-ampere characteristic curve to build an equation set of the sectional integral equation and the manifestation integral equation so as to solve the five electric parameters of solar cell photo-generated current, reverse saturation current, ideal factors, parallel resistance and serial resistance. The method has the advantages that by the solar cell volt-ampere characteristic curve under light, the five electric parameters such as the solar cell photo-generated current can be extracted simply and precisely.

A volt-ampere characteristic testing system of a solar cell photovoltaic device belongs to a photoelectric testing device and solves problems that an existing testing system needs to set irradiance through manual operation, and irradiance determining and sample battery testing cannot be carried out simultaneously. The volt-ampere characteristic testing system comprises a sunlight simulator, an irradiance choosing device, an irradiance determining device, a battery testing device and a computer. The sunlight simulator is composed of a an xenon lamp on an optical path and filtering sheets with air quality of 1.5, and the irradiance choosing device and the irradiance determining device are sequentially arranged on an output optical path of the solar simulator. A direct current voltage source supplies power to the irradiance choosing device and irradiance determining device. The battery testing device is connected with the computer through a general purpose interface bus. The volt-ampere characteristic testing system is simple in assembly, fast and easy to operate, all required devices and components can be bought at the market, elements can be acquired easily, and the volt-ampere characteristic testing system can accurately and automatically give out a characteristic curve in real time.

The invention discloses a vacuum plating method integrating advantages of magnetron sputtering and multiple-arc ion plating, in particular to a micro-arc ion plating method. The method comprises the steps as follows: a high-frequency impulse electric field with negative 1,200 V to negative 900 V output voltage, 0.5 KHz-60 KHz frequency and 0.5 mu s-30 mu s pulse width is firstly established, a high-frequency impulse signal output from the high-frequency impulse electric field is modulated by an adjustable inductance attenuation and a digital logic circuit and loaded to a rectangular cathode target with an area of 300 mm*100 mm and two ends of an anode vacuum chamber casing with a volume of Phi 450 mm *H 400 mm, and argon (Ar) gas charged into a vacuum chamber is subjected to an ion plating process when volt-ampere characteristics of negative 900 V to negative 600 V voltage, 100 A-300 A current, 1 ms-5 ms pulse width and 3%-15% duty ratio are generated during discharge. The method is simple and stable; and by means of the method, the yield is high, and industrial production can be realized.

The invention discloses a floating voltage-controlled memristor simulator circuit, comprising an integrated operational amplifier U1, multipliers U2 and U3 and a few resistors and capacitors, wherein one resistor is connected to an input end; another resistor is connected with the integrated operational amplifier U1, and the integrated operational amplifier U1 is used for implementing differential amplification, inverse addition, integral operation and inverse amplification; the integrated operational amplifier U1 is connected with the multipliers U2 and U3, and the multipliers U2 and U3 are connected with each other and used for multiplying signals. The simulator circuit realizes the volt-ampere characteristics of a voltage-controlled memristor through a simulation circuit.

The invention is a method of preparing microdisc array, adopting 4 steps: firstly inserting micron or nano fiber electrode material in quartz capillaries, then placing these capillaries in different shaped templates and fixing them into electrode array with different appearance on the surface. Inserting the template in the glass tube, one end of the electrode material is connected and led out by copper wires using Ag conductive glue, and the other end is injected with epoxy glue and packaged, and placing and solidifying the electrode array at room temperature. Placing the solidified microdisc array electrodes in sequence on the rough sand paper and 1.5, 0.5, and 0.03 mum alpha -Al2O3 for smoothing and polishing, then making circulating volt-ampere in the Fe(CN)63- water solution at 5mmol / L, where the supporting electrolyte is KCl at 1mol / L, the potential range is 0.6-0v, and the scanning speed is 0.01V / s and if the circulating volt-ampere graph is S-shaped, it shows that the microdisc array electrodes are successful.

The invention relates to a Matlab / Simulink-based alternating current (AC) fault arc simulation method. The method comprises the following steps of 1) based on a mathematical model of a direct current (DC) arc, assuming a mathematical model of dynamic volt-ampere characteristics of the arc according to the relation between the static characteristics and dynamic characteristics of the arc, thus building dynamic mathematical models of a low-voltage series AC fault arc in a resistance system and a resistance and inductance system; 2) determining the combustion process of the AC fault arc by analyzing the dynamic mathematical models of the AC fault arc; 3) building a simulation model of the AC fault arc via Matlab / Simulink software according to the combustion process and dynamic mathematical models of the AC fault arc; and 4) operating the simulation model of the AC fault arc in the resistance system and the resistance and inductance system, and outputting the simulation results of the simulation model. Compared with the prior art, the method has the advantages of high simulation accuracy, accurate analysis of the dynamic characteristics of the arc, strong universality and the like.

The invention discloses a method for extracting parameters of a solar cell, which is applied to the technical field of energy sources. The method comprises the following steps of: (1) measuring a dark volt-ampere characteristic curve of the solar cell; (2) measuring a dark conductance voltage characteristic curve and a dark differential conductance voltage characteristic curve of the solar cell; and (3) fitting the dark volt-ampere characteristic curve, the dark conductance voltage characteristic curve and the dark differential conductance voltage characteristic curve of the solar cell by adopting a theoretical formula to obtain series resistance, shunt resistance, an ideal factor and reverse saturation current of the solar cell, wherein the series resistance, the shunt resistance, the ideal factor and the reverse saturation current satisfy minimum standard deviations between experimental data and the theoretical formula. Compared with the traditional method of only relying on a single volt-ampere characteristic (or conductance voltage characteristic) curve under illumination to fit and extract parameters of the solar cell, the method disclosed by the invention has the characteristics of higher accuracy and stronger applicability.

The invention relates to a contact-type circuit board testing system, which includes a computer interface, first and second FPGA (Field Programmable Gate Array) circuits connected with the computer interface, and a triode switch array circuit at least formed by two groups of triode circuits and connected with control signal output terminals of the first and the second FPGA circuits; each triode circuit includes a PNP type triode and an NPN type triode; and collecting electrodes of the PNP type triode and the NPN type triode are connected. The contact-type circuit board testing system has many testing nodes and better expansibility to the FPGA circuit, can be used for quickly finding the effective criteria testing point to obtain the node network based on the criteria testing point, has high anti-interference ability, and cannot influence the volt-ampere relationship due to leakage current or leakage voltage.

A method of state estimation is provided, including: (a) acquiring a plurality of positive sequence voltage and current phasor measurements; (b) designating a reference positive sequence voltage phasor measurement from the acquired phasor measurements; (c) correcting the acquired phasor measurements to account for the reference phasor measurement; (d) calculating complex power having a real component and an imaginary component, using the corrected positive sequence voltage and current phasor measurement; (e) using the real component of said complex power as a calculated mega-watt and the imaginary component of the complex power as a calculated mega-volt-ampere; and (f) using the mega-watt and mega volt-ampere calculations in a state estimation algorithm.

The invention discloses a DNA biosensor based on a three-dimensional ordered gold doped nano titanium dioxide electrode and a preparation method as well as a method for detecting breast cancer genes by using the sensor. The preparation method comprises the following steps: preparing a three-dimensional ordered gold doped nano titanium dioxide film electrode (3DOMGTD / ITO) on an ITO (indium tin oxide) electrode by adopting a template method; then dropping a DNA probe (5'-Fc-ssDNA) labeled with ferrocene at 5' end on the electrode, thereby preparing a modified electrode, namely the DNA biosensor; placing the modified electrode in a solution of a breast cancer gene segment, hybridizing, detecting the variation of hybridization signals by adopting a differential pulse volt-ampere method, and carrying out electrochemical detection on the breast cancer gene. According to the invention, the label-type DNA biosensor is prepared by utilizing the specificity recognition effect between the DNA probe and the breast cancer gene, and the DNA biosensor has favorable stability, reproducibility and electrode regeneration, and can be applied to the field of DNA hybridization and tumor electrochemical detection.

The invention discloses a tester. The tester comprises a power supply module, a first measuring module, a second measuring module and a master control module. The power supply module is used for providing a test power supply capable of adjusting voltage and frequency continuously. The first measuring module can obtain an output voltage and an output current of the power supply module in real time and performs predetermined volt-ampere characteristics treatment, no-load treatment or load treatment to the output voltage and the output current so as to realize the PT (Predetermined) volt-ampere characteristics, and single phase no-load and single phase load test of a transformer. The second measuring module is used for monitoring the high voltage side voltage of the transformer during an alternating current voltage withstand test of the transformer, and feeds the value to the master control module, so that the master control module adjusts the output of the power supply module according to the high voltage side voltage value and the predetermined withstand voltage value so as to perform the alternating current withstand voltage test of the transformer. Therefore, the tester provided by the invention integrates the test functions such as PT volt-ampere characteristics, single phase no-load and single phase load test of the transformer and alternating current voltage withstand test, thereby improving the test efficiency.

The invention discloses a photovoltaic power generation system online IV curve test device and a test method. The online IV curve test device comprises a temperature acquisition system, a solar irradiance gauge, a multi-channel photovoltaic assembly IV tester, an industrial control computer, a switch, a host computer and a switching case. According to the online IV curve test device, a relay with relatively low cost and having no arc discharge is employed to switch photovoltaic assemblies, IV curves of the assemblies are respectively tested through rapid scanning, accurate volt-ampere characteristics of the photovoltaic assemblies are acquired, and the online IV curve test device satisfies online IV curve tests on all channel assembly strings through cascade networking at present. Through the method, after switching one assembly at each time, an output voltage of the residual assembly string is guaranteed to be greater than the lowest input work voltage of an inverter, and a cell input power is further guaranteed to be greater than a normal start power of the inverter. The whole test period of rapid assembly switching, rapid IV curve scanning test and rapid switching recovery is controlled to be quite short, the online IV curve test function is realized.

The invention discloses a highly-integrated Langmuir probe diagnosis system and method. The highly-integrated Langmuir probe diagnosis system comprises a Langmuir probe, a trigger, a scanning power supply, a data acquisition unit and a data processing unit. The trigger transmits a pulse trigger signal to the scanning power supply via an optical fiber to trigger generation of sawtooth voltage with designated amplitude, period and repeat account, and the sawtooth voltage is loaded onto the Langmuir probe; the data acquisition unit carries out rapid, multiple and synchronous acquisition and storage on the voltage and current data of the Langmuir probe; and after completion of data acquisition, all the results are sent to the data processing unit in one shot, a data processing program on a computer is employed for automatic processing and analysis, and an acquired volt-ampere characteristic curve and acquired plasma parameters are displayed. The highly-integrated Langmuir probe diagnosis system has high automation degree and integrated level, can realize high-speed synchronous data acquisition and large-quantity data storage and communication, employs data processing for automatic processing and analysis of acquired data and provides a good man-machine interaction interface for displaying and recording of processing results.

The invention discloses a volt-ampere electronic tongue, which comprises a sensor array, a hardware circuit and intelligent algorithm analysis software, and is characterized in that: the sensor array consists of working electrodes, auxiliary electrodes and a reference electrode; each auxiliary electrode is arranged in the middle of each working electrode; the hardware circuit comprises a signal excitation unit, a signal conditioning unit and a data acquisition unit; and the intelligent algorithm analysis software comprises a sensor channel parameter setting module, a test module, a sample database information module, an intelligent sensor cleaning module, an excitation signal parameter setting module, a data storage module and a help module. The volt-ampere electronic tongue creatively changes a detection pulse signal according to the characteristic of a detection system and has the advantages of a large amount of acquired detection information, high accuracy of a detection result, wide applicable detection range, convenient operation, no need of sample pretreatment, and short detection time.

The invention relates to a testing method for a contact circuit board testing system. The testing system comprises a computer interface, a first field programmable gate array (FPGA) circuit, a second FPGA circuit and a triode switch array circuit, wherein the first and second FPGA circuits are connected with the computer interface; the triode switch array circuit is connected with the control signal output ends of the first and second FPGA circuits, and at least comprises two groups of geminate transistor circuits; each geminate transistor circuit comprises a PNP type triode and an NPN type triode; and the collectors of the PNP type triode and the NPN type triode are connected. A great number of test nodes are produced, and the FPGA circuits have high extensibility. An effective reference test node can be quickly found, and a node network based on the effective reference test node can be obtained. Anti-jamming capability is high, and the influence of leakage current or leakage voltage on the volt-ampere relationship of the node network can be avoided.

The invention relates to a distributed photovoltaic module string and module volt-ampere (IV) characteristic curve on-line measurement system, which comprises a photovoltaic module wireless voltage sensor, a photovoltaic subarray IV curve scanning module and an upper computer data management center. The photovoltaic module wireless voltage sensor is used for measuring module voltage, is powered by a super-capacitor and a photovoltaic module, and transmits voltage data to the IV curve scanning module through a wireless sensor network; the IV characteristic curve scanning module carries out time-sharing IV curve scanning on each module string, triggers the voltage sensor of a module to acquire synchronous voltage data so as to realize module IV curve scanning, and transmits IV data of the modules and the module strings to the upper computer data management center. The distributed photovoltaic module string and the module volt-ampere (IV) characteristic curve on-line measurement system provided by the invention can acquire accurate photovoltaic module string and module IV characteristic curve data on-line and in real-time, so that the efficiency and the accuracy in testing, evaluating and diagnosing a photovoltaic power generation array are effectively improved.