CN207819564U - Failure monitoring system with current detection function - Google Patents
Failure monitoring system with current detection function Download PDFInfo
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- CN207819564U CN207819564U CN201721632270.XU CN201721632270U CN207819564U CN 207819564 U CN207819564 U CN 207819564U CN 201721632270 U CN201721632270 U CN 201721632270U CN 207819564 U CN207819564 U CN 207819564U
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Abstract
The utility model is mainly concerned with a kind of failure monitoring system with current detection function.The first numerous equipment is serially connected in a link, first equipment is used to for the electric energy that its input terminal is drawn from corresponding photovoltaic module to be transmitted to its output end for providing output power, it is disposed with the first current detector on the circuit of first first equipment in being coupled to link and is disposed with the second current detector on the circuit of first equipment of the last one of end in being coupled to link, it whether there is failure with the presence or absence of error to detect link by comparing both the first current value that the first current detector detects and the second current value that the second current detector detects.Failure monitoring system can detect the state of insulation in photovoltaic cell string formation and fault electric arc to greatest extent, and foundation is provided for the safe operation of photovoltaic generating system.
Description
Technical field
The utility model is mainly concerned with technical field of solar, is specifically, is being related to containing photovoltaic cell
The monitoring system of photovoltaic cell string formation state of insulation and electric arc can be monitored by being provided in energy framework, detect light extraction to greatest extent
The state of insulation and fault electric arc in battery string formation are lied prostrate, foundation is provided for the safe operation of photovoltaic generating system.
Background technology
Regenerative resource is used widely due to having many advantages, such as clean, safe and pollution-free and regeneration.It is sent out with photovoltaic
Electricity is the example for using new energy, entire straight-flow system network containing multiple-limb, as user is to power supply quality and power supply reliability
It is required that raising, straight-flow system safe and reliable operation important are more shown to the reliability and stability of power system power supply.Direct current
System mainly includes DC network, accumulator group, stable-pressure device and inverter composition.The photovoltaic module of photovoltaic plant
The Regional Distribution of quantity and its dispersing type is extremely huge, and centralized power station is particularly evident, improves the weight of DC network reliability
It is exactly that the insulation to whole network carries out on-line monitoring and earthing wire-selecting to want means, so as to find the exhausted of straight-flow system in time
Edge defect and solution defect problem.The battery string formation framework that photovoltaic module is constituted is the object that user needs key monitoring, to
Prevent the generation of the insulation fault of straight-flow system.The insulating monitoring with earthing wire-selecting of straight-flow system substantially mainly have below at present
Optional method：Using bridge balance principle or injection low frequency signal method etc..The state of insulation of straight-flow system is directly related to directly
Streaming system reliability of operation, therefore the insulating resistance value of online monitor system is very important, photovoltaic plant is big
Part is located at field, and the insulation fault for positioning power equipment becomes more important.The direct current that the DC system of power industry is related to
Many is all that floating operation or neutral ground are run relative to the earth.Straight-flow system wants reliability service, it is necessary in real time
The insulation situation of the positive and negative anodes of on-line monitoring system busbar and branch over the ground.
The busbar of photovoltaic module in photovoltaic plant or the reliability of branch and the focus of safety are：That to be made great efforts keeps away
Exempt from the harm electric arc occurred in system.The solution that electric arc is not still satisfied with how is monitored when electric arc occurs at present.When
When generating sufficiently high voltage between two electrodes of local power equipment or cable etc., possible starting arc.Voltage can cause
Interelectrode gas is usually the ionization of air, and plasma gradually forms, and electric current can flow between the electrodes.In this way
Plasma may heat and be increased to thousands of degrees Celsius so that representative bright electric arc occurs.Such high-temperature temperature
It may cause system failure, even system or neighbouring device be made to catch fire in extreme circumstances.There are two kinds in system in general
Different types of electric arc：Parallel electric arc and serial electric arc.Parallel electric arc is being happened between the anode of system and cathode or is sending out
One in two electrodes is given birth between the earth to occur.Relatively, serial electric arc is not in two different circuits or branch
Occur between road, but occur in the circuit of the same current lead-through, i.e., in two parts of the same circuit or two offices
Occur between portion's segment.What serial electric current of the electric arc usually in some circuit occurred when being interrupted, for example connect by opening
Touch switch or in the case where plug and cable etc. are destroyed.According to historical experience：Plant issue is connected, as crimp force reaches
Less than require, connector damage；The junctions such as terminal, connector lug, fuse do not compress；It is passed through at the link position of two terminals
Prolonged oxidation is crossed, bolt is not tightened；Connecting line or cable insulation reduce；Construction quality is unqualified and compression bonded line is bad or
Terminal is fixed not secured enough；Apparatus insulated go wrong etc. may all cause electric arc.
Utility model content
In an optional but nonessential embodiment of the utility model, disclose a kind of with current detection function
Failure monitoring system, wherein including mainly：
The first numerous equipment is serially connected in a link, and the first equipment is used for its input terminal from corresponding photovoltaic
The electric energy that component is drawn is transmitted to its output end for providing output power；
It is disposed with the first current detector on the circuit of first first equipment in being coupled to link and is being coupled to chain
In road the second current detector is disposed on the circuit of first equipment of the last one of end；
The second electric current that the first current value and the second current detector detected by the first current detector detects
Value identifies fault type present in link.For example：Compare the first current value and second that the first current detector detects
Both second current values that current detector detects whether there is failure with the presence or absence of error to detect link.
The above-mentioned failure monitoring system with current detection function, wherein：
First equipment is shunting device：
For bypassing and forbidding providing electric energy into link, Huo Zheyong a photovoltaic module corresponding with shunting device
Transfer to provide electric energy into link in a photovoltaic module corresponding with shunting device is switched to access state from bypass condition.
The above-mentioned failure monitoring system with current detection function, wherein：
First equipment is power optimization device：
For being arranged the output power of a photovoltaic module corresponding with power optimization device at maximum power point.
The above-mentioned failure monitoring system with current detection function, wherein：
Respective output power is supplied to inverter by the first numerous equipment, chain road in inverter because by depositing
Common-mode voltage the induced generation of excitation Ground leakage current be equal to the first and second current values difference.
The above-mentioned failure monitoring system with current detection function, wherein：
It is electric that the state of insulation of link insulation against ground electric leakage resistance value characterization and insulation against ground electric leakage resistance value are equal to the common mode
Pressure divided by Ground leakage current thereby leak electricity resistance value to detect link with the presence or absence of insulation fault according to insulation against ground.
The above-mentioned failure monitoring system with current detection function, wherein：
, there are in the case of electric arc, the first current value and the second current value are unequal, exist in link in judging link
Arc fault be parallel arc.
The above-mentioned failure monitoring system with current detection function, wherein：
There are in the case of electric arc, the first current value and the second current value link if equal exist in judging link
Arc fault be serial arc.
The above-mentioned failure monitoring system with current detection function, wherein：
First equipment includes the first and second output ends for providing output power, and the first numerous equipment is connected in series with
The second output terminal of previous first equipment of Shi Renyi is coupled to the first output end of the first equipment of adjacent the latter；
Total tandem voltage that numerous the first equipment provides be equal in it the first output end of first first equipment and
The superposition value of voltage between the second output terminal of end the first equipment of the last one.
The above-mentioned failure monitoring system with current detection function, wherein：
It is disposed with the first current detector on the circuit of the first output end for being coupled to first first equipment and is coupling
It is disposed with the second current detector on to the circuit of the second output terminal of end the first equipment of the last one.
The above-mentioned failure monitoring system with current detection function, wherein：
First current detector and the second current detector include current divider.
In photovoltaic generating system using to direct current branch or link in there are two distinct types of electric arcs：Parallel electric arc
With serial electric arc, this has been illustrated in preceding sections.Arc detector or equivalent instrument with arc-detection function, it is easy to
Quickly and efficiently detect arc signal present in direct current branch or link, but how rapidly to screen it is existing and
Row electric arc and serial electric arc are still without good screening devices.Furthermore common mode leakage current is to be needed in photovoltaic generating system especially
One of the problem of concern and monitoring, needs to monitor on-line DC bus and each in real time to ensure the reliability service of system
The positive and negative anodes of distributed direct current branch or DC link are to the insulation situation of the earth, when a certain monitoring point is to the insulated electro of the earth
When resistance is less than the alarming value set, it has to be possible to timely send out alarm signal and user is reminded to solve the problems, such as.
Description of the drawings
To keep above-mentioned purpose and feature and advantage more obvious and easy to understand, specific implementation mode is done below in conjunction with the accompanying drawings
Detailed explaination, read it is described further below and with reference to the following drawings after, the feature and advantage of the application will be evident.
Fig. 1 is the example schematic that fault electric arc detection is carried out at the distribution of photovoltaic cell.
Fig. 2 is the example schematic for the detection that leakage current is carried out at the distribution of photovoltaic cell.
Fig. 3 is the schematic diagram of the unified detection head and the tail both ends electric current on the chain road of photovoltaic cell.
Specific implementation mode
Below in conjunction with each embodiment, the technical solution of the utility model is clearly completely illustrated, but described
Embodiment be only the utility model with being described herein explanation embodiment used and not all embodiment, those skilled in the art
The scheme that member is obtained without making creative work belongs to the scope of protection of the utility model.
In the whole system of photovoltaic generation, core component is usually made of solar panel permutation and power inverting part, inverse
Low frequency isolation transformer can be arranged in conventional scheme by, which becoming between device and mains net, realizes simultaneously mesh portions and panel array
Electrical isolation, advantage is to ensure the safety of exposed population group, and can provide voltage matches and alternating current grid current DC quantity
Separation inhibit；Disadvantage is that low-frequency transformer causes additional cost in terms of building power grid cost and volume and weight, also
Cause the transfer efficiency of unsteady flow very low.Consider Pros and Cons, although transformer plays buffer action but to whole
A photovoltaic generating system is not to select well.In contrast, non-isolated gird-connected inverter is not usually required to any high
The transformer or equivalent apparatus of frequency or low frequency, power conversion efficiency is very high, also has in terms of volume and cost control apparent
The effective effect in front.Inverter can be in photovoltaic cell plate array and power grid if abandoning isolating transformer during grid-connected
Between build electric connecting relation, cause common mode current significantly rise and thing followed security risk.Common mode current
Eliminating becomes the problem that must pull against of non-isolated grid-connected inverting system, leakage current/battery branch insulation condition monitoring it is accurate
Property be to need the doubt that fully considers, be to prevent leakage current/insulation fault and to take the precondition of counter-measure.No matter it is isolated
Formula or non-isolated inversion system, fault electric arc/insulation fault are the problem of must pull against.
It, will be total after the voltage superposition that the multiple power levels optimizer 102-1 to 102-N of tandem type is respectively exported referring to Fig. 1
Voltage with higher voltage value is supplied to inverter 150, inverter to converge multiple power levels optimizer respectively since corresponding photovoltaic
Actual power value collected by component.Inverter 150 capture the general power that is aggregated and execute direct current to alternating current standard
Inversion program.By taking power optimization device 102-N as an example, the output voltage values of output end, which are equal to collected by own, corresponds to photovoltaic
The actual power value divided by bus current of component 101-N, and the bus current flowed through on power line LN1-LN2 is substantially equal to inverse
Become the input voltage of general power divided by inverter 150 that device 150 captures.It may be used between inverter and power optimization device wireless
Communication or power line carrier communication realize the real-time delivery of data information.
Referring to Fig. 1, in an alternate embodiment of the invention, inverter 150 can be used Flying capacitor multilevel inverter and can also be
The inverter etc. of single-phase or multiphase bridge-type H-BRIDGE.Power optimization device is dc voltage changer and comes from it for receiving
Input terminal at the offers such as photovoltaic module/chemical industry battery/fuel cell electric energy, be converted further into output terminal
Output power.The meaning of power optimization：Some power optimization device needs the output current by some paired battery or component
With output voltage setting at the maximum power point of the battery/component.In other words, power optimization device needs the power being inputted to set
It is set to the maximum power point of the battery/component matched with it.And have following characteristics：Power optimization device needs to output it electric current
It is arranged to the output current of the battery/component matched with it without direct correlation property, power optimization device, which needs to output it voltage, to be set
The output voltage of the battery/component matched with it is set to without direct correlation property.
Referring to Fig. 1, photovoltaic module array is the basis that photovoltaic generating system is converted from luminous energy to electric energy.Light is shown in figure
Basic battery string formation is installed in volt assembly array, about battery string formation：Each battery string formation framework is by multiple mutual strings
The photovoltaic module concatenation of connection is constituted, and photovoltaic module can also be substituted for fuel cell or chemical cell.The main work of battery string formation
With being embodied in：Although being made of multiple photovoltaic modulies in each battery string formation and its these internal multiple photovoltaic module being
Concatenated relationship, but multiple and different battery string formations is substantially the relationship of parallel connection and provides electric energy to inverter 150.In the application
In every piece of photovoltaic cell or photovoltaic module be each equipped with the power optimization electricity for executing so-called MPPT maximum power point trackings calculation
Road：The electric energy that first order photovoltaic module 101-1 is generated carries out power by first power optimization device 102-1 and converts to execute power
Optimization, the electric energy that second level photovoltaic module 101-2 is generated carries out power conversion by second power optimization device 102-2, until N grades
The photovoltaic electric energy that generates of photovoltaic module 101-N by N grade of power optimization device 102-N carry out power convert it is excellent to execute power
Change, N here is the natural number more than 1.The power of power optimization device output corresponding with every piece of photovoltaic cell just characterizes the light
It lies prostrate battery and the actual power in battery string formation is provided.
Referring to Fig. 1, in optional but nonessential embodiment, it is assumed that be serially connected with the first order inside some battery string formation framework
The rest may be inferred by photovoltaic module 101-1, second level photovoltaic module 101-2 ... to N grades of photovoltaic module 101-N, the work(of the first order
Rate optimizer 102-1 is used to executing MPPT maximum power tracings and carrying out voltage the voltage source of first order photovoltaic module 101-1
It converts and exports V1, and so on, until N grades of power optimization device 102-N is used for N grades of the photovoltaic module 101-N
Photovoltaic electric potential source execute maximum power tracing and carry out voltage conversion and export VN.It can then learn energy in single battery string formation
The total tandem voltage enough provided is approximately equal to：The voltage value V that the power optimization device 102-1 of the first order can be exported1In addition the
The voltage V that the power optimization device 102-2 of two level is exported2Then the power optimization device 102-3 for adding the third level is exported
Voltage V3..., and so on, it is added to the voltage value V that N grades of power optimization device 102-N can be exportedN, total tandem electricity
The result of pressure is equal to V1+V2+…VN.The voltage conversion of booster type may be used in power optimization circuit or referred to as power optimization device
Circuit, the voltage conversion circuit of the voltage conversion circuit of voltage-dropping type or buck-boost type or cuk converter CUK etc..Some battery pack
Meet the power optimization device 102-1 of the first order, the power optimization device 102-2 of the second level in string framework until N grades of power is excellent
Change device 102-N etc. to be connected in series with by power line, the voltage respectively exported by power optimization device 102-1 to 102-N on power line
The tandem voltage being superimposed be fed to the power equipments such as header box or inverter confluence and inversion after it is grid-connected again.Power is excellent
Change and be conveyed to the power supply of inverter 150 after the respective output powers of device 102-1 to 102-N summarize again, inverter can also be substituted for
Charger to charge the battery.
Referring to Fig. 1, each voltage conversion such as power optimization device 102-1 to N grades power optimization device 102-N of the first order
Circuit is equipped with processor 112 mentioned below, the voltage conversion circuit of the types such as converter BUCK, BOOST, BUCK-BOOST
Powerinjected method MPPT calculations are executed in the art, are realized by the pulse width modulating signal PWM that processor 112 exports.
Those skilled in the art both knows about, and pulse width modulating signal PWM is mainly the power switch in driving voltage conversion circuit
Element realizes boosting, decompression and the buck etc. to cell voltage.In switch power supply system, power supply uses power semiconductor
Device is as switch element, and by periodical on-off switch, the duty ratio of control switch element adjusts output voltage.Switch electricity
Source is mainly made of the part such as input circuit, translation circuit and output circuit and control unit, and power conversion is core, mainly
It is made of switching circuit, in order to meet high power density requirement, converter needs to be operated in high frequency state, and switching transistor will adopt
With the crystal arm that switching speed is high, the turn-on and turn-off time is short, typical power switch has power scr, power field effect brilliant
Body pipe and insulated type bipolar transistor etc. are a variety of.It is mixed that control mode is divided into pulse width modulation, pulsewidth modulation and frequency modulation(PFM)
Close a variety of, the most common modulation systems of pulse width modulation such as modulation, pulse frequency modulated.The DC/ of DC to DC
DC converters such as voltage changer, power pack etc. are suitable for power optimization device, and power optimization device is direct current to direct current
Converter, belong to the scope of Switching Power Supply and be also unimodule rank battery maximum power tracing power equipment.Simultaneously
The inverter circuit that inverter 150 uses equally also belongs to the application of switch power supply system.Switched-mode power supply according to input and it is defeated
The difference for going out voltage form is divided into alternating current to the converter such as frequency converter, transformer of alternating current, is also classified into alternating current to direct current
Electricity converter such as rectifier, and be divided into direct current to alternating current converter, be also divided into direct current to direct current converter
Such as voltage changer, power pack.Inverter then belongs to direct current to the converter for example various single-phase or multiphase of alternating current
Inverter.
Referring to Fig. 1, they are logical by power optimization device 102-1 to N grades of power optimization device 102-N of the concatenated first order
It crosses DC bus i.e. power line LN1-LN2 and provides electric energy/power supply to inverter 150, inverter executes DC bus power supply straight
Flow to the inversion of alternating current, the alternating current of generation can be used locally or grid-connected.For example more level of the inverter containing flying capacitor type
Inverter or single-phase semi-bridge, single-phase full bridge, push-pull type, three-phase bridge type converter etc., it is inverter not shown in figure
The pulse-width signal that the processor or microprocessing unit of configuration are exported can be used for driving inverter.In many inversion occasions
Theoretical foundation be with the amplitudes such as a series of but relatively narrow pulse of different size replaces a sine wave, sine wave to be divided into
Several deciles can also regard several pulse trains being connected with each other as.The principle of industry SPWM waveforms is made with sine wave
For the expectation waveform of inverter output, the isosceles triangle wave using frequency than expectation wave height is as carrier wave, with frequency and desired waveform
Identical sine wave is as modulating wave, and when modulating wave intersects with carrier wave, inverter switch device is determined by their intersection point
The break-make moment, to relatively narrow in both sides in the half period of the sinusoidal modulation wave but amplitudes such as series of wide middle of acquisition
Wide not equal rectangular wave.So-called SPWM waveforms：Namely pulse width is changed and the PWM equivalent with sine wave by sinusoidal rule
Waveform, may be implemented direct current to alternating current inversion purpose.
Referring to Fig. 1, in switch power supply system, the voltage transformation for the DC to DC for being considered as power optimization device is made full use of
This Switching Power Supply of the device characteristic of itself：The first input end IN1 of the power optimization device 102-1 of the first order is coupled to corresponding
The cathode of the photovoltaic module 101-1 of level-one and the second input terminal IN2 be coupled to the photovoltaic module 101-1 of the first order anode to
Output carries out the photovoltaic module between the first output end O1 and second output terminal O2 of the power optimization device 102-1 of the first order
The output voltage of the transformed output power of power, the power optimization device 102-1 of the usual first order is to meet second output terminal O2
Current potential subtract the current potential of the first output end O1 and be equal to its output voltage.It is illustrated again using other Switching Power Supplies as example：
The first input end IN1 of N grades of power optimization device 102-N is coupled to the cathode of corresponding N grades of photovoltaic module 101-N,
And second input terminal IN2 be coupled to N grades photovoltaic module 101-N anode in N grades of power optimization device 102-N
The first output end O1 and second output terminal O2 between output to the photovoltaic module carry out the transformed output power of power, usually
It is that the output voltage of N grades of power optimization device 102-N meets the current potential of second output terminal O2 and subtracts the first output end O1
Current potential is equal to its output voltage.It should be noted that power optimization device itself inputs its first input end IN1 and second
The electric energy drawn from corresponding photovoltaic module between the IN2 of end is converted into/is transmitted to defeated from its first output end O1 and second
The output power of outlet O2 outputs.The output end for the component output current and power optimization device that the input terminal of power optimization device receives
The electric current output end of component output voltage and power optimization device that receives without direct correlation property, the input terminal of power optimization device
Voltage is without direct correlation property, and the output current and output voltage setting of component that power optimization device receives input terminal are at corresponding
The maximum power point of photovoltaic module.
Referring to Fig. 1, the power optimization device of tandem type using fixed voltage design concept：The control module of inverter
It can determine that the voltage of a stable DC bus, inverter summarize each concatenated power optimization according to the alternating voltage at exchange end
The performance number that device is collected into, and then bus current can be obtained.The voltage of any one optimizer output end is equal to its institute at this time
The power divided by bus current of the photovoltaic module of collection.After the exception being blocked occurs in component, the component being blocked is corresponding excellent
Peak power output value can be redefined according to volt-ampere curve by changing device, under the premise of maintaining DC bus-bar voltage constant, inversion
Device recalculates bus current and for example becomes smaller, and since the power for the photovoltaic module being blocked reduces, leads to the photovoltaic module blocked
Corresponding optimizer can also be depressured to confirm that output current is up to standard.The optimizer corresponding to photovoltaic module not being blocked then can
Boosting carrys out output current up to standard.If component be blocked it is excessively serious, power optimization device will bypass be blocked it is serious
Component until component recovery to can working condition, the optimization of battery string formation framework is the process that voltage is supplied in fact.
Referring to Fig. 1, the maximum feature of power optimization device functionally is exactly that component and inverter functionality are separated, and is different from
Traditional photovoltaic generating system.It seems component and inverter is accessed by optimizer, in fact component is used only to starting guide device
And optimizer cooperates after collecting the maximum power of the photovoltaic module to inverter.The for example technology of fixed voltage, not only solves
Determined photovoltaic generating system partial occlusion the problem of, for the system of multigroup string, each string formation component count does not need equal yet
It is even furnished with the sunlight direction/position of each component in a string groups also not needing.In addition to circuit topology is in structure
Except advantage, power optimization device also has great advantage on maximum power point tracking algorithm.Traditional maximum power point
Tracing algorithm is substantially based on two kinds：Climbing method and logic method of determining and calculating.Advanced back tracking method these also use combined techniques：Such as
Climbing method binding constant area method coordinates the full scan method of Fixed Time Interval to find maximum power point；Also have in conjunction with slope
Polarity method and conductance increment method, cooperation detection paces control methods are accurate under ideal test condition to find maximum power point algorithm
Rate can reach 99% or more.Based on this translative mode advantage on power, optimizer can be allowed compared to traditional
Inverter has the electric energy of 5-30% or so to be promoted.Different from the limited AC power of Miniature inverter, power optimization device can be with
The power being collected into is transmitted completely to inverter.Any scheme for being directed to the maximum power tracing of photovoltaic cell in the prior art is suitable
For the voltage conversion circuit of the application, common maximum power tracing method has constant voltage process, conductance increment method and disturbance
Observation etc., the application no longer repeat the scheme for how executing MPPT.
Referring to Fig. 1, multistage power optimization device 102-1 to 102-N is connected in series with according to following rule：Arbitrary previous stage work(
The second output terminal of rate optimizer is coupled to the first output end of neighboring later stage power optimization device by power line.With actual
Connection relation is demonstrated：Power optimization device 102-1 and power optimization device 102-2 is adjacent and connects.In multistage and it is concatenated power
In the relationship of optimizer：The second output terminal O2 of previous stage power optimization device 102-1 is connected to so-called rear stage power optimization device
The second output terminal O2 of the first output end O1 of 102-2, previous stage power optimization device 102-2 are connected to rear stage power optimization device
First output end O1 of 102-3 etc..Total tandem voltage that then concatenated multiple power levels optimizer provides is equal to optimizer
The superposition value of the their own output voltages of 102-1 to 102-N.It is also assumed that：The power optimization device 102-1 of the first first order
The first output end O1 and end afterbody power optimization device 102-N second output terminal O2 between can provide it is more
The tandem voltage of a power optimization device.The so-called first output end O1 of the power optimization device 102-1 of the first first order is quite more
The equivalent cathode of grade power optimization device, opposition, the second output terminal O2 of the power optimization device 102-N of the last level-one at end
Be the equal of the equivalent anode of multiple power levels optimizer, one of one group of power line/DC bus LN1 is coupled to equivalent anode
And the other of one group of power line LN2 is coupled to equivalent cathode.Pay attention to first when we provide the series connection of multiple power levels optimizer
The current potential of the first output end O1 of first order power optimization device 102-1 is minimum, and alsies specify the afterbody at end
The current potential of second output terminal O2 of power optimization device 102-N be highest, situation above is the different power optimization device of comparison
The premise of respective output terminal potential.DC bus namely so-called two power line LN1-LN2 are respectively coupled to inverter 150
A pair of of input terminal, inverter stablize input voltage design concept namely be the equal of the voltage for needing stable DC busbar.
Referring to Fig. 1, in field of photovoltaic power generation, because various terminal/contact terminal is for example between multilevel optimization's device
It can be in contact bad, aging, short circuit etc. between connection terminal and cause arcing, arc fault significant portion is the reason is that due to cable
The electrical insulation properties aging of conducting wire is damaged and pollution and there was dampness in the air causes air breakdown.In addition contacting points position is electrically loose
Dynamic is also one of cause, is the process across dielectric and continuous luminous and electric discharge, the obvious characteristic of arc discharge is adjoint
The high mutation rate etc. of strong light and heat and noise, electromagnetic radiation, voltage and current.Serial electric arc and parallel electric arc are main and need
The arc fault to be paid close attention to.The simplest method of positioning failure in tandem type power optimization device system：It is excellent in multiple power levels
Change the arc sensor 115 for configuring detection electric arc in device 102-1 to 102-N for each power optimization device.Individually detection is every
The arcing conditions of the output end of a power optimization device, its processor when nearby arc fault occurs for the output end of power optimization device
The electric arc alarm signal that arc sensor 115 is sent out can be perceived at once, fault electric arc event is further sent to by processor
Receive terminal and as a kind of warning.An arc sensor is separately configured for each power optimization device to detect the power optimization
There are certain unfavorable factors for the fault electric arc of device：Cost dramatically increases, the subsidiary arc sensor production of each power optimization device
Raw extra cost can exceed that the half of overall cost.The reduction of arc-detection precision is also resulted in, different power is excellent
The arc sensor for changing other power optimization devices in the link that the fault electric arc that device itself generates may be concatenated captures, and leads
Cause can not distinguish on earth be that power optimization device generate true electric arc.
Referring to Fig. 1, in field of photovoltaic power generation, the metal edge frame of photovoltaic module is to meet the earth GND, most of photovoltaic module
Frame uses metallic aluminium, is one of reason based on security consideration.It was found that the respective positive and negative anodes of photovoltaic module 101-1 to 101-N
There are all kinds of capacitances to meeting parasitism between ground.Solar panel depends primarily on the distribution capacity of the earth in the face of solar panel itself
The factors such as product and the air humidity and component mounting means on local soil property and periphery, the complete model ratio of parasitic capacitance
It is more complex.Substantial optimizer part-structure itself is also required to be grounded if necessary, its shell when for example, by using metal shell
The earth must be connect.The output end of power optimization device may also have parasitic distribution capacity between the earth.Inverter passes through exchange
Output is grid-connected to power grid by alternating current, and ground resistance is distributed between the earth point of power grid and the earth point of the metal edge frame of photovoltaic module
It is anti-, connecing for similar ground impedance and power grid is also distributed between the earth point and the earth point of power optimization device of same power grid
Ground impedance etc. is distributed between place and the earth point of inverter.The problem of industry be can not ignore be：The inversion of various inverters
Bridge (such as half-bridge, single-phase full bridge) or bridge arm will produce so-called poor, common-mode voltage and further result in common mode circuit
In, generate common mode leakage current.The current leakage of common mode over the ground of photovoltaic module and power optimization device needs cause particularly to pay attention to,
The parasitic capacitance between the earth of photovoltaic module and power optimization device does not permit under the influence of the factors such as humidity and local dust
Perhaps ignored, very high numerical value can be reached.The common mode current of high frequency can cause grid-connected current harmonic wave and meaningless loss to increase
Add, can also cause electromagnetic interference to influence each electrical equipment in whole system and generate serious security risk,
Mechanism essentially consists in photovoltaic module or power optimization device and inverter and power grid and forms common mode time by parasitic capacitance
Road, the rapid variation of the common-mode voltage in common mode circuit cause stray inductance in circuit, capacitance repeated charge and generate it is so-called
Common mode leakage current.Photovoltaic generating system and power grid are not ideal insulation against ground systems, the insulation of entire straight-flow system compared with
Singlephase earth fault even occurs for difference, larger leakage current and the earth-fault current of docking is will produce, even if having pre-set
The switch tripper of protective effect but since leakage current is perhaps not enough to trigger switch open circuit electric appliance.Failure long-term existence can be led
The problem of cause：Local pyrexia makes insulation damages aggravate, and generates arc fault and even causes fire, when failure propagation until two
DC bus insulation against ground will cause two DC bus short circuits and cause system trip when very poor.
Referring to Fig. 2, in field of photovoltaic power generation, DC system is largely floating over the ground mode or neutral point
Ground connection is the convention formed based on electric power development initial stage to run.In order to ensure the reliability service of DC system, need in real time
On-line monitoring system busbar and each branch positive and negative anodes insulation situation over the ground, when insulation against ground resistance in certain point is less than setting
When fixed alarming value, alarm signal is sent out in time, and provide fault point.It is positioned usually in tandem type power optimization device system exhausted
Reason hinders simplest method：It is configured for each power optimization device in multistage power optimization device 102-1 to 102-N
The leakage current sensor 125 of one detection leakage current, to individually detect the leakage current of the output end of each power optimization device
Situation, when nearby insulation fault occurs for the output end of power optimization device, its 112 horse back of processor can perceive leakage current sensing
The leakage current situation that device 125 detects, the voltage-to-ground divided by its Ground leakage current of each output end of power optimization device are nearby
It is equal to its insulation against ground resistance.The compatible electricity in traditional DC micro-electric flow measurement formula of leakage current sensor 125 is isolated
Sensor, measurement method can be perforation structure, and no insertion loss and overload capacity are strong, and anti-electromagnetic interference capability is strong and power supply is suitable
Answer range wide, between outputting and inputting not altogether, input signal is DC micro-electric stream, or even can also use export for
The sensor of the communication interfaces such as RS-485 is thereby used for DC power system each time to measure straight-flow system insulation leakagel volume leakage stream
The insulating monitoring on road.Whether processor 112 further by leakage current situation and occurs insulation against ground event and is sent to reception terminal
And as a kind of warning, when alarming value of the insulation against ground resistance of some power optimization device less than setting processor will and
When send out alarm signal, provide fault point.The voltage-to-ground of each branch for example each output end of power optimization device can be direct
It is measured using current voltage sensor, is not illustrated especially in figure.The insulating monitoring mode is multiple power levels optimizer chain
Road needs the branch insulation for being individually for each power optimization device to monitor mating at least one leakage current sensor, and quantity occupies
More leakage current sensors is the prime cost for constituting ground insulation prison.The Ground leakage current of some arbitrary photovoltaic module is therewith
It is measured in the front side input line of a corresponding power optimization device, photovoltaic module is carried from front side input line to power optimization device
For photovoltaic electric energy, Ground leakage current is one group of front side input for being respectively coupled to photovoltaic module positive and negative anodes of each power optimization device
Difference between currents on line (input line for being such as coupled to input terminal IN1-IN2).Or the Leaked Current of Line to Ground of some arbitrary photovoltaic module
Stream measured on the rear side output line of a corresponding power optimization device, power optimization device by rear side output line (such as
It is coupled to the output line of leading-out terminal O1-O2) its progress transformed output voltage of power is exported, Ground leakage current is every at this time
A power optimization device is used to provide the difference between currents on one group of rear side output line of its output voltage.It is measured from the input line of front side
Voltage-to-ground and Ground leakage current or the voltage-to-ground and Ground leakage current that are measured from rear side output line can calculate certain
The insulation against ground resistance of a component and its mating optimizer.
Referring to Fig. 1, as the one embodiment for substituting property, arc fault event is to be connected in series with multiple power levels excellent
Change globality detection on the DC bus namely power line LN1-LN2 of device, without individually in every level-one power optimization device
Output end is detected, that is, is not necessarily to being coupled on the output line of leading-out terminal O1-O2 be detected, certainly without again every
The input terminal of level-one power optimization device, which is detected, to be not necessarily to being coupled in the input line of input terminal IN1-IN2 be examined
It surveys.Advantage is：Assuming that it is exactly only the one of DC bus that the quantity of power optimization device, which is the arc sensor 115 that N is then used,
It is a, than the arc sensor for saving N-1 quantity originally.It is no longer needed in optimizer 102-1 to 102-N as each power
Optimizer configures the arc sensor of a detection arc signal, instead each power of the detection of globality directly on busbar
The input terminal of optimizer and/or the arcing conditions of output end, some arc sensor 115 are for example installed in inverter side simultaneously
It is used cooperatively with the processor that inverter is configured, power line passes through punched-type or cross-linking arc sensor, electric arc
Monitoring also belongs to electrical isolation formula.When the input terminal and/or output end of the power optimization device of any level-one in entire link
Arc sensor 115 sends out electric arc alarm signal, the processor or microprocessor list of inverter configuration when arc fault nearby occurs
Fault electric arc event is further sent to reception terminal by member after receiving the electric arc alarm signal that arc sensor 115 is sent out
And as a kind of warning.This warning can be a plurality of types of, for example with ear-piercing whistle sound or the warning lamp etc. of flicker
As eye-catching prompt, receives terminal and be equivalent to be alert device, the signal of fault electric arc event can additionally be sent
To breaker, busbar voltage is directly cut off to avoid the loss of bigger.In comparison, the not only use number of arc sensor
Amount is significantly reduced.Realize the means of the fault electric arc detection of high accurancy and precision：By multiple power levels optimizer 102-1 to 102-N
It is connected in series with and provides electric energy to inverter 150, for inverter to carry out inversion of the direct current to alternating current, alternating current can be grid-connected
It is used to power grid or directly under this ground wire.It is used to per level-one power optimization device 102-N in entire link in tandem pair and its phase
The photovoltaic module 101-N matched executes maximum power point tracking, and so-called maximum power point tracking namely power optimization device will be with
The output current and output voltage of some photovoltaic module 101-N of power optimization device adaptation is arranged to this in power conversion process
The maximum power points of photovoltaic module 101-N, power optimization device is played is converted to output end by the electric energy that receiving terminal receives
The effect of output power.
Referring to Fig. 2, as the one embodiment for substituting property, insulation fault event is to be connected in series with multiple power levels excellent
Change globality detection on the DC bus namely power line LN1-LN2 of device, without individually in every level-one power optimization device
Output end is detected namely without being detected to being coupled on the output line of leading-out terminal O1-O2, certainly without existing again
Input terminal per level-one power optimization device is detected namely without carrying out to being coupled in the input line of input terminal IN1-IN2
Detection.Advantage is：If the leakage current sensor 125 that the quantity of power optimization device, which is N, then to be used is only one of DC bus
, than the leakage current sensor for saving N-1 quantity before.Without being that each power is excellent in optimizer 102-1 to 102-N
Change the leakage current sensor that device configures a detection insulation fault.The each power optimization device of detection of globality on busbar
The insulation against ground situation of output end：For example two power line LN1-LN2 as busbar pass through some punched-type or cross-linking
Leakage current sensor 125, the detection of leakage current also belongs to electrical isolation formula, and leakage current sensor can match with inverter
The processor set is used cooperatively.The leakage current situation of DC bus can be detected by leakage current sensor 125：Electric leakage is spread
When sensor is run, the output signal of sensor on busbar is monitored in real time, when bus insulation situation is normal, flow through leakage current sensing
The size of current of device is equal and direction is on the contrary, its output signal is zero；When busbar is there are when imperfect earth, leakage current sensor has
Difference current flows through, and the output of sensor is not zero.Near the input terminal and/or output end of the power optimization device of any level-one
When insulation fault occurs, leakage current sensor 125 can detect the leakage current of DC bus.It is detected using voltage sensor
Go out two busbares voltage-to-ground respectively over the ground and detected the Ground leakage current of DC bus further through leakage current sensor,
The insulation against ground resistance of two busbares respectively over the ground can be calculated.Eventually by measure busbar positive and negative anodes voltage-to-ground, with
And the DC leakage current of each busbar branch over the ground, the insulation against ground resistance of busbar branch is calculated.Specific calculation
Exactly two busbares voltage-to-ground respectively over the ground divided by respective Ground leakage current are exactly respective insulation against ground resistance value.For
The reliability service for ensureing the straight-flow system comprising Series power optimizer, needs real-time on-line monitoring system busbar and each work(
The insulation situation of the positive and negative anodes of rate optimizer branch over the ground, when alarming value of the insulation against ground resistance of certain point less than setting,
It sends out alarm signal in time and provides abort situation point.
Referring to Fig. 3, each power optimization device being equivalent in Fig. 1-2 above is replaced by a shunting device.The first order
Shunting device 182-1, second level shunting device 182-2 are until so-called N grades shunting device 182-N etc. passes through concatenation line
It is connected in series with, connection relation is in the link that multistage shunting device 182-1 to 182-N is connected in series with：Arbitrary so-called previous stage
The second output terminal of shunting device is coupled to the first output end of neighboring later stage shunting device, total tandem electricity that link provides
Pressure is equal to the superposition value of the respective output voltage of multistage shunting device in it.Link physical relationship is：First order shunting device
The second output terminal O2 of 182-1 is coupled to neighboring later stage namely the first output end O1 of second level shunting device 182-2, and
The second output terminal O2 of second level shunting device 182-2 is coupled to the of neighboring later stage namely third level shunting device 182-3
One output end O1, and so on the second output terminal O2 of N-1 grades of shunting device is coupled to its adjacent rear stage bypass dress
Set the first output end O1 of 182-N.So as to think each by multistage shunting device 182-1 to 182-N on transmission concatenation line
The tandem voltage being superimposed from the voltage of output is fed to carry out similar to power equipments such as header box or inverters
Another mistake of converging change etc., tandem voltage is conveyed by busbar LN1-LN2.
Referring to Fig. 3, photovoltaic module 101-N is linked into using shunting device 182-N execution by multistage shunting device series connection structure
At link in switching — that is, shunting device 182-N photovoltaic module 101-N is linked into the operation in link, or execute from chain
The operation that the switching — that is, shunting device 182-N disconnected in road removes photovoltaic module 101-N from link.In link architecture
The first input end IN1 of setting shunting device 182-N is connected to photovoltaic module 101-N cathode, and bypass is set in link architecture
The second input terminal IN2 of device 182-N is connected to photovoltaic module 101-N anodes.It is other in optional but non-limiting embodiment
The the first output end O1 and second output terminal O2 of road device 182-N can export what the corresponding photovoltaic module 101-N was generated
Power, namely using shunting device instead of the power optimization device of Fig. 1.In the topological structure of optional shunting device 182-N：
The access switch of definition can be coupling between the second input terminal IN2 and the second output terminal O2 of shunting device, or access switch
It is coupling between first input end IN1 and the first output end O1.Or the access switch defined in a word is being coupling in component just
Between pole and second output terminal O2 or it is coupling between the cathode of component and the first output end O1.It is fixed in shunting device topology
The removal switch of justice is then coupling between the first output end O1 and corresponding second output terminal O2.The work of shunting device 182-N
Mechanism：Then photovoltaic module 101-N is just linked into multistage shunting device to its processor 112 configured driving access switch connection
The voltage and power section of oneself are contributed in the link being connected in series with and to tandem voltage, processor 112 also drives shifting at this time
Except switch is turned off, i.e., photovoltaic module is linked into the operation in link by shunting device.Otherwise the place of shunting device 182-N configurations
Manage the removal switch connection link that then photovoltaic module 101-N is just connected in series with from multistage shunting device of the driving definition of device 112
In shield/bypass, the voltage and power part of oneself can not be contributed to the tandem voltage of link again to photovoltaic module 101-N
Point, processor 112 also drives the access of definition to switch and is turned off at this time, i.e., shunting device removes photovoltaic module from link
Operation.It can be seen that the function embodiment of shunting device exists：Forbid carrying into link for bypassing corresponding photovoltaic module
Transfer to carry into link for electric energy, or for corresponding photovoltaic module to be switched to access state from shielding/bypass condition
For electric energy.The first input end if the access of definition switch is coupling between the second input terminal IN2 and second output terminal O2
First output end O1 of IN1 and shunting device can be directly coupled together.If the access switch of definition is coupling in first
Then the second input terminal IN2 and second output terminal O2 can be directly coupled together between input terminal IN1 and the first output end O1.
Referring to Fig. 3, in the topological structure of optional shunting device 182-N：The access switch of some definition can couple
Between its second input terminal IN2 and second output terminal O2, or access switch is coupling in first input end IN1 and corresponding the
Between one output end O1.Or so-called access switch of the shunting device defined in is coupling in the anode and second of component in a word
Or being coupling between output end O2 between the cathode of component and the first output end O1.Bypass defined in shunting device topology
Diode is then coupling between the first output end O1 and corresponding second output terminal O2, and bypass diode is used for replacing being mentioned above
Removal switch and serve the same role.The cathode of bypass diode Bypass-Diode is connected to the first output of shunting device
End O1 and anode is connected to the second output terminal O2 of shunting device.The processor driving access switch connection of shunting device 182-N is then
Photovoltaic module 101-N is just linked into the link that multistage shunting device is connected in series with and contributes oneself to tandem voltage
Photovoltaic module is linked into the operation in link by voltage and power section, the cut-off that bypass diode can be reversed, i.e. shunting device.
The access switch of the processor 112 driving definition of shunting device 182-N configuration be turned off then photovoltaic module 101-N just by from more
It shields/bypasses in the link that grade shunting device is connected in series with, so that so-called photovoltaic module 101-N can not be again to the link
Tandem voltage contribute the voltage and power section of oneself, and the conducting that the bypass diode can be positive, i.e. shunting device
The operation that photovoltaic module is removed from link.It can be seen that the function embodiment of shunting device exists：For by corresponding photovoltaic group
Part bypasses and forbids providing electric energy into link, or for switching corresponding photovoltaic module from shielding/bypass condition
Electric energy is provided to access state then into link.
Referring to Fig. 3, numerous shunting device 182-1 to 182-N is serially connected in a link and bypass in monitoring system
Device be used for by the electric energy that its input terminal is drawn from corresponding photovoltaic module be transmitted to it for providing output power
Output end, for example：The electric energy that shunting device 182-N is used to be drawn input terminal IN1-IN2 from corresponding photovoltaic module 101-N
It is transmitted to its output end O1-O2 for providing output power.It is implemented on the basis of the embodiment of Fig. 1 and Fig. 2 as follows
Corrective measure：The first current detector 225B is disposed on the circuit of first shunting device 182-1 in being coupled to link,
It is coupled on the circuit of the shunting device 182-N of the last one of end in link and is disposed with the second current detector 225A, the
One current detector 225B is arranged in the upper second current detector 225A of power line LN2 and is arranged on power line LN1.Purpose is logical
It crosses and compares what the first current value I1 and second current detector 225A that first current detector 225B is detected was detected
Both second current value I2 whether there is certain form of failure with the presence or absence of error to detect in link.Because we can lead to
It crosses and compares the first current value that the first current detector detects and both the second current values that the second current detector detects
Between relationship identify failure present in link.Pay attention to the first current detector being applied in shunting device framework
225B and the second current detector 225A are also applied in the embodiment about power optimization device of Fig. 1-2, only other
Road device is replaced by power optimization device.
Referring to Fig. 3, respective output power is supplied to inverter by shunting device 182-1 to 182-N, or by above
Respective output power is supplied to inverter by the power optimization device 102-1 to 102-N referred to, can natively be existed in inverter
Poor, common-mode voltage, and chain is on the road because of the induced generation of excitation by common-mode voltage present in inverter to floor drain
Electric current is equal to the difference of the first current value I1 and the second current value I2.The state of insulation of link with insulation against ground leak electricity resistance value characterization and
Insulation against ground leaks electricity resistance value equal to so-called common-mode voltage divided by Ground leakage current, thereby leaks electricity resistance value according to insulation against ground to detect
Link whether there is insulation fault：Judge insulation against ground electric leakage resistance value whether less than some preset early warning value be to monitor link
No there are insulation faults, then mean that there are insulation faults less than early warning value, only in insulation against ground electric leakage resistance value not less than pre-
If early warning value when could indicate state of insulation preferably and be not present any unacceptable insulation fault.Conventional use of electric leakage
Flow sensor is fitted around on the outlet circuit of the positive cathode of DC loop, detects each in real time when straight-flow system is run
The output signal of the leakage current sensor of road distribution, when branch insulation situation is normal, the electric current for flowing through leakage current sensor is big
Small equal, direction is on the contrary, its output signal is zero；When branch has ground connection, leakage current sensor with the presence of difference current and
The output of leakage current sensor is not zero.Therefore by detecting the output signal of each branch leakage current sensor it may determine that straight
Streaming system ground branch.First current value that first current detector 225B and the second current detector 225A are respectively sampled
I1 and the second current value I2 can be used for analyzing insulation situation：So-called first and second electricity is flowed through when branch insulation situation is normal
The size of current of current sensor is equal, and direction is opposite；When branch has ground connection, the electric current of the first and second current detectors has difference
It is worth electric current to exist, it was demonstrated that insulation is out of condition.Then the first and second current detectors can substantially substitute traditional leakage current
Sensor saves cost and raising accuracy of detection to detect insulation fault.
Referring to Fig. 3, respective output power is supplied to inverter by shunting device 182-1 to 182-N, or by above
Respective output power is supplied to inverter by the power optimization device 102-1 to 102-N referred to.There are electric arcs in judging link
In the case of, such as arc signal can be detected by arc sensor, or directly utilize the first current value and the second electricity
Flow valuve whether there is electric arc to analyze in link.Whether there is electric arc in arc sensor analysis power line LN1-LN2 is to pass through
The current information of power line LN1-LN2 is analyzed to screen arc signal, as long as by the first current value I1 and second electric current
The information of value I2 is supplied to the processor of inverter or optimizer or shunting device, detecting principle of the processor based on electric arc namely
The operation principle of arc sensor can equally identify and whether there is failure in the data of the first current value and the second current value
Arc signal.Arc sensor can also be even allowed directly to utilize the first current detector and the second current detector 225B-
The first current value and the second electric current Value Data of 225B crawls sense and judge arc signal.In optional but nonessential reality
It applies in example, there are in the case of electric arc, the first current value and the second current value are unequal, think in link in judging link
Existing arc fault is parallel arc；In judging link there are in the case of electric arc, the first current value and the second current value
Think that arc fault existing for link is serial arc if equal.In optional but nonessential embodiment, multistage string
Respective output power is supplied to the power optimization device of inverter or plural serial stage by the shunting device 182-1 to 182-N of connection
Respective output power is supplied to inverter by 102-1 to 102-N：Then be coupled to first power optimization device 102-1 first is defeated
It is disposed with the first current detector 225B on the power line circuit of outlet O1, is coupled to the end power optimization device of the last one
It is disposed with the second current detector 225A on the power line circuit of the second output terminal O2 of 102-N.First and second electric currents
Current divider may be used in detector 225B-225B.The first He that first current detector and the second current detector respectively sample
Second current value I1-I2 can be used for analyzing arcing conditions：When there is no arc signal in branch in the first and second current values
The high frequency band signal where any electric arc is not mixed；When there are when arc signal then in the first and second current values in branch
Significantly it is mixed with the signal with the high frequency band where electric arc.Therefore we declare the first and second current detectors essence
On can substitute traditional arc sensor detect direct current arc fault and save cost and improve arc-detection precision, electric current
The effect of detector is can to screen or identify or extract existing direct-current arc signal in the first and second current values,
Then analysis is parallel arc or serial arc.In judging link there are in the case of electric arc for example from first and second electricity
Electric arc is grabbed in flow valuve, the first current value and the second current value are unequal, and arc fault present in link is electricity in parallel
Arc.There are for example grab electric arc, the first electric current in the case of electric arc in the first and second current values in judging link
Value and the second current value arc fault existing for link if equal are serial arcs.According to above it is found that passing through the first electricity
The second current value that the first current value and the second current detector that current sensor detects detect exists to identify in link
Fault type：Insulation fault, series connection and parallel arc fault.The advantage of the application is the electric current monitored by current detector
As a result the DC current information of string formation framework is obtained, without additional using other current detecting means again, namely
Current detector takes into account multiple function.
Above by description and accompanying drawings, the exemplary embodiments of the specific structure of specific implementation mode, above-mentioned practicality are given
It is novel to propose existing preferred embodiment, but these contents are not intended as limiting to.For a person skilled in the art, it reads
After reading above description, various changes and modifications undoubtedly will be evident.Therefore, appended claims, which should be regarded as, covers this
The true intention of utility model and whole variations and modifications of range.It is any and all etc. in the application Claims scope
The range and content of valence, are all considered as in the intention and range that still belong to the utility model.
Claims (4)
1. a kind of failure monitoring system with current detection function, which is characterized in that including：
The first numerous equipment is serially connected in a link, and the first equipment is used for its input terminal from corresponding photovoltaic module
The electric energy drawn is transmitted to its output end for providing output power；
It is disposed with the first current detector on the circuit of first first equipment in being coupled to link and in being coupled to link
It is disposed with the second current detector on the circuit of end the first equipment of the last one；
The second current value that the first current value and the second current detector detected by the first current detector detects come
Identify fault type present in link；
First equipment includes the first and second output ends for providing output power, and the first numerous equipment is connected in series with former
The second output terminal for previous first equipment of anticipating is coupled to the first output end of the first equipment of adjacent the latter；Numerous first sets
The standby total tandem voltage provided is equal to the first output end of first first equipment and the last one first of end in it and sets
The superposition value of voltage between standby second output terminal；It is arranged on the circuit of the first output end for being coupled to first first equipment
There is the first current detector and is disposed on the circuit of second output terminal for being coupled to end the first equipment of the last one
Two current detectors；
Respective output power is supplied to inverter by the first numerous equipment, chain road is because by present in inverter
The Ground leakage current of the induced generation of excitation of common-mode voltage is equal to the difference of the first and second current values, and the state of insulation of link is used
Insulation against ground electric leakage resistance value characterizes and insulation against ground electric leakage resistance value is equal to common-mode voltage divided by Ground leakage current, and according to exhausted over the ground
Edge electric leakage resistance value whether less than early warning value come monitor link whether there is insulation fault；Or
In judging link there are in the case of electric arc, it is electric present in the first current value and the unequal then link of the second current value
Arc failure is parallel arc, and in judging link there are in the case of electric arc, if the first current value and the second current value
Equal, arc fault existing for link is serial arc.
2. the failure monitoring system according to claim 1 with current detection function, it is characterised in that：
First equipment is shunting device：
For bypassing and forbid providing electric energy into link a photovoltaic module corresponding with shunting device, or for will
A photovoltaic module corresponding with shunting device is switched to access state from bypass condition and transfers to provide electric energy into link.
3. the failure monitoring system according to claim 1 with current detection function, it is characterised in that：
First equipment is power optimization device：
For being arranged the output power of a photovoltaic module corresponding with power optimization device at maximum power point.
4. the failure monitoring system according to claim 1 with current detection function, it is characterised in that：
First current detector and the second current detector are current divider.
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