CN105991091A - Mobile detection system for power grid adaptability testing for high-altitude photovoltaic power station - Google Patents
Mobile detection system for power grid adaptability testing for high-altitude photovoltaic power station Download PDFInfo
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- CN105991091A CN105991091A CN201510082713.1A CN201510082713A CN105991091A CN 105991091 A CN105991091 A CN 105991091A CN 201510082713 A CN201510082713 A CN 201510082713A CN 105991091 A CN105991091 A CN 105991091A
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Abstract
The invention provides a mobile detection system for power grid adaptability testing for a high-altitude photovoltaic power station. The mobile detection system comprises a step-down transformer container connected with a power grid, a boosting transformer container connected with a tested generating unit of a photovoltaic power station, and a centralized control container. The step-down transformer container consists of a network side switch cabinet and a step-down transformer connected to the centralized control container. The boosting transformer container includes a machine-side switch cabinet and a boosting transformer connected to the centralized control container. The centralized control container includes a grid disturbance device and a centralized control operation device; the grid disturbance device is used for simulating the operating state of the power grid; and the centralized control operation device is used for adjusting the working state of the mobile detection system and putting forward technical requirements that need to be met by the system in a high-altitude environment. Compared with the prior art, the provided mobile detection system has the following beneficial effects: power grid adaptability testing optimization is realized; the detection process becomes reliable; and the high altitude requirement can be met.
Description
Technical field
The present invention relates to a kind of mobile detecting system for grid adaptability test, be specifically related to a kind of for High aititude photovoltaic electric
The mobile detecting system of grid adaptability of standing test.
Background technology
In world wide, photovoltaic power generation technology development is swift and violent at present, and the substantial amounts of photovoltaic plant that is incorporated into the power networks is set up one after another, along with more coming
The most photovoltaic generating systems access electrical network, and electrical network is not caused big impact and electricity by the grid integration in order to ensure photovoltaic plant
The running status change of net does not affect the equipment safety of photovoltaic plant, and grid-connected photovoltaic system is all proposed by various countries' grid company
New strict demand, has formulated standard and grid-connected examination criteria that photovoltaic electric station grid connection accesses one after another, has only passed through associated mechanisms
Grid-connected detection, obtain grid-connected qualification, just can ensure that photovoltaic plant secure accessing operation of power networks, wherein photovoltaic plant disturbance is fitted
The detection of answering property is i.e. one of which.
Photovoltaic plant grid disturbance adaptability refers to when, in power system, photo-voltaic power generation station site occur change in voltage, frequency wave
Time dynamic, certain change in voltage, frequency fluctuation time limit in, photo-voltaic power generation station can keep not off-grid to run continuously.At present
Industry standard recommend low-voltage crossing detection device preferably use variable-frequency power sources simulating grid frequency, the situation of voltage pulsation.
The Northwest's major part that photovoltaic resources enriches belongs to High aititude region, and the site detecting equipment of grid-connected photovoltaic power station is anxious to be lacked.
The grid adaptability detection device developing High aititude movable type grid-connected photovoltaic power station is extremely urgent.In addition photovoltaic plant adaptive detection
Precision and the automaticity of test are the highest, it is impossible to the running state information in comprehensive monitoring experimentation, need in process of the test
More human intervention, adds the complexity of test operation, the most therefore brings the risk of human users's error.And detect
System control principle and the defect in structure, harmonic wave is excessive, control accuracy is the highest, and integral device or the components and parts of detecting system are equal
Can receive certain impact, can cause the generation of resonance condition time serious, the safe, tested of whole photovoltaic detecting system is set by this
Standby or even electrical network all creates certain potential safety hazard.
Grid disturbance adaptive detection process of the test often relates to high-voltage switch gear divide-shut brake, the continuous back brake of low-voltage circuit breaker,
Transformator switchings etc. operate.The reliability of this generic operation can greatly affect test be normally carried out even can cause to testing equipment
Infringement, therefore, to transformator, high-tension switch cabinet, low-voltage circuit breaker in photovoltaic plant grid disturbance adaptive detection process of the test
And the monitoring in real time of Large Copacity variable-frequency power sources running state parameter is highly important.So, a set of complete automatically control and
Comprehensive method of protection, when system is occurred accidental situation, the quickly location of fault is the most necessary, to follow-up Failure elimination,
The recovery of test and the safety of testing equipment play certain guaranteeing role.Higher height above sea level is possessed accordingly, it is desirable to provide a kind of
Adaptability, high reliability, draw draw, with live, improve automatization level photovoltaic plant grid disturbance adaptive detection system.
Summary of the invention
In order to meet the needs of prior art, the invention provides a kind of shifting for the test of High aititude photovoltaic plant grid adaptability
Dynamic detecting system, described system includes that the blood pressure lowering being connected with electrical network becomes what container generator unit tested with in photovoltaic plant was connected
Rise buckling container, and collection control container；
Described blood pressure lowering becomes container and includes netting side switch cubicle and step-down transformer, described step-down transformer access set control container；
Described liter of buckling container includes pusher side switch cubicle and booster transformer, described booster transformer access set control container；
Described collection control container includes grid disturbance device and collection control operation device；Described grid disturbance device, for simulating grid
Running status；Described collection control operation device, for adjusting the duty of described mobile detecting system.
Preferably, described grid disturbance device includes variable-frequency power sources and grid simulator；Described variable-frequency power sources includes theft-resistant link chain loop,
And the first branch road of being connected with transformator respectively and the second branch road；
Described grid simulator, regulates frequency, amplitude and the phase place of inverter output AC electricity in described variable-frequency power sources；By first
The alternating current of branch road output and the alternating current superposition of the second branch road output, be met the alternating current of testing requirement；
Preferably, described first branch road includes electric capacity C1, inverter PWM1 and the wave filter LC1 being sequentially connected with；Described inverse
Becoming device PWM1 is alternating current by filtered for electric capacity C1 DC inverter, and described alternating current device LC1 after filtering filtering is followed by
Enter in described transformator；
Described first branch road includes electric capacity C2, inverter PWM2 and the wave filter LC2 being sequentially connected with；Described inverter PWM2
It is alternating current by filtered for electric capacity C2 DC inverter, after described alternating current device LC2 after filtering filtering, accesses described transformation
In device；
Described transformator is connected with the booster transformer risen in buckling container, and filtered alternating current is exported photovoltaic plant
Tested generator unit；
Preferably, described grid simulator includes A/D modular converter, FPGA and DSP；Described A/D modular converter, to institute
State variable-frequency power sources output voltage signal and current signal carry out data conversion after be sent to FPGA；Described FPGA, to described electricity
Pressure signal and current signal carry out logical process；
Described DSP, the voltage signal sent according to described FPGA and current signal, control the output signal of described variable-frequency power sources,
And described output signal and failure alarm signal are sent to the monitoring system of photovoltaic plant；
The control mode of described DSP includes fundamental mode and harmonic mode；
Preferably, described fundamental mode, anti-for two close cycles based on variable-frequency power sources output voltage instantaneous value and output current instantaneous value
Feedback controls；
Described harmonic mode, controls for closed loop feedback based on variable-frequency power sources output voltage instantaneous value；Described harmonic mode is to described
Instantaneous voltage carries out the feedforward, to suppress the higher hamonic wave in described instantaneous voltage；Feed-forward coefficients is 1-LC ω2, described
L and C is respectively inductance value and the capacitance of wave filter；
Preferably, described collection control operation device includes comprehensive protector, and be connected with communication controler respectively operating board,
PLC device and humiture instrument；Described comprehensive protector and communication controler are connected with switch respectively；Described switch passes through
The monitoring system of Ethernet access photovoltaic plant；
Described PLC device, receives the control instruction that described monitoring system issues, the on-off model of acquisition operations platform output, depends on
The duty of PLC is adjusted according to described control instruction and on-off model；
Described communication controler, is sent to the monitoring system of photovoltaic plant by the output signal of described on-off model and humiture instrument；
Preferably, described operating board include test/stop knob, point/combined floodgate knob CB1, point/combined floodgate knob CB2, fault be multiple
Return button and scram button；
Described test/stopping knob including test node and Stop node, is used, respectively, to initiate detecting system and stop detection system；
Described point/combined floodgate knob CB1 includes separating brake node CB1 and combined floodgate node CB1；
Described point/combined floodgate knob CB2 includes separating brake node CB2 and combined floodgate node CB2；
Described fault involution button, for Manual reset operation after detecting system Failure elimination；
Described scram button, for the manual stop detection system when breaking down；
Preferably, described scram button includes normally closed node and normally opened node；
Described normally closed node respectively with the theft-resistant link chain loop of variable-frequency power sources in grid disturbance device, and combined floodgate node CB1 and combined floodgate
Node CB2 connects；Described normally opened node is in parallel with separating brake node CB1 and separating brake node CB2 respectively；
Preferably, the duty of described PLC device includes standing-by state, test state, fault case and shutdown state；
Described PLC device receives in described operating board point/switching signal of combined floodgate knob CB1 and point/combined floodgate knob CB2 point
After lock signal, work in standing-by state；
Described PLC device receives in described operating board point/switching signal of combined floodgate knob CB1 and point/conjunction of combined floodgate knob CB2
After lock signal, work in test state；
Described PLC device receives in described operating board variable-frequency power sources in the actuating signal of scram button, and grid disturbance device
Theft-resistant link chain loop actuating signal after, work in fault case；
In the case of described scram button and theft-resistant link chain loop are the most not operating, described PLC device receives described operating board pilot scale
After testing/stop the stopping actuating signal of knob, work in shutdown state.
Compared with immediate prior art, the excellent effect of the present invention is:
1, in technical solution of the present invention, the frequency regulation of variable-frequency power sources controls flexibly, can produce two-way frequency by two-way inverter
Rate, carries out frequency regulation by folded frequency method, obtains what adaptive detection needed by output frequency and the phase place of regulation two-way inverter
Output frequency；
2, in technical solution of the present invention, the output frequency of variable-frequency power sources has the advantage that precision is high, harmonic wave is little；
3, in technical solution of the present invention, PLC device includes standing-by state, test state, fault case and four kinds of duties of shutdown state,
Various demands adaptive detection during can be flexibly met, the abnormal conditions being likely to occur during having taken into full account detection,
Ensure that the reliability of detecting system；
4, in technical solution of the present invention, PLC device monitors, according in photovoltaic plant, the control instruction that the host computer of system issues, from
Dynamic switch operating state, it is achieved that the detection full-automatic unmanned intervention of process, greatly improves the convenience of test, it is to avoid unexpected
The generation of situation；
5, in technical solution of the present invention, in operating board test/stop knob, point/combined floodgate knob CB1, point/combined floodgate knob CB2,
The operating process of fault involution button and scram button is reliable, it is possible to is monitored the situations such as the time-out in breaking-closing operating, keeps away
During inspection-free survey, because switching, divide-shut brake is unsuccessful causes abnormal conditions to occur；
6, in technical solution of the present invention, it is determined that in grid side, photovoltaic plant side and mobile detecting system under high altitude environment
The adaptive technique requirement of primary equipment, substantially increases electrical safety and the reliability of high altitude localities mobile detecting system；
7, in technical solution of the present invention, use comprehensive protector that the fault case of mobile detecting system is monitored, when event occurs
During barrier problem, it is achieved trip protection；
8, a kind of mobile detecting system for the test of High aititude photovoltaic plant grid adaptability that the present invention provides, it is achieved that to electricity
The optimization of net disturbance adaptive detection, makes detection process become reliable and facilitate, meets the requirement of vehicle-mounted transport.
Accompanying drawing explanation
The present invention is further described below in conjunction with the accompanying drawings.
Fig. 1: a kind of mobile detecting system structure chart for the test of High aititude photovoltaic plant grid adaptability in the embodiment of the present invention；
Fig. 2: variable-frequency power sources structure chart in the embodiment of the present invention；
Fig. 3: the fundamental mode control circuit schematic diagram of grid simulator in the embodiment of the present invention；
Fig. 4: the harmonic mode control circuit schematic diagram of grid simulator in the embodiment of the present invention；
Fig. 5: grid simulator structural representation in the embodiment of the present invention；
Fig. 6: collection control operation apparatus structure schematic diagram in the embodiment of the present invention；
Fig. 7: the duty transition diagram of PLC device in the embodiment of the present invention.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, the most identical or
Similar label represents same or similar element or has the element of same or like function.Describe below with reference to accompanying drawing
Embodiment is exemplary, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.
The invention provides a kind of mobile detecting system being applicable to the test of High aititude photovoltaic power station power generation unit grid adaptability, real
Show the networking of communication, intelligent control, protection real time implementation during photovoltaic plant disturbance adaptive detection, made photovoltaic plant
Disturbance adaptive detection process is safer reliably.
As it is shown in figure 1, this mobile detecting system includes that the blood pressure lowering being connected with electrical network becomes in container and photovoltaic plant in the present invention
Tested generator unit connect liter buckling container, and collection control container.
One, blood pressure lowering becomes container
Including net side switch cubicle and step-down transformer, step-down transformer access set control container.
The present embodiment is netted side switch cubicle and step-down transformer compatibility 35kV and 10kV.
Net side switch cubicle, refers to be integrated with the switch cubicle of the various electric switches that mobile detecting system accesses electrical network.
Two, buckling container is risen
Including pusher side switch cubicle and booster transformer, booster transformer access set control container.
Pusher side switch cubicle and booster transformer compatibility 35kV and 10kV in the present embodiment；
Pusher side switch cubicle, refers to be integrated with and mobile detecting system accesses the various electrical equipment of tested generator unit in photovoltaic transformer station
The switch cubicle of switch.
Three, collection control container
Including grid disturbance device and collection control operation device.Wherein,
Grid disturbance device, for the running status of simulating grid；Collection control operation device, for adjusting the work of mobile detecting system
Make state.
1, grid disturbance device
Including variable-frequency power sources and grid simulator.Wherein,
Variable-frequency power sources includes theft-resistant link chain loop, and the first branch road of being connected with transformator respectively and the second branch road.
Grid simulator, frequency, amplitude and the phase place of inverter output AC electricity in regulation variable-frequency power sources；By the first branch road output
Alternating current and the second branch road output alternating current superposition, to be met the alternating current of testing requirement.
(1) variable-frequency power sources
1.: as in figure 2 it is shown, the first branch road includes electric capacity C1, inverter PWM1 and the wave filter LC1 being sequentially connected with；Inverse
Becoming device PWM1 is alternating current by filtered for electric capacity C1 DC inverter, accesses and become after alternating current device LC1 after filtering filtering
In depressor.First branch road includes electric capacity C2, inverter PWM2 and the wave filter LC2 being sequentially connected with；Inverter PWM2 will
The filtered DC inverter of electric capacity C2 is alternating current, accesses in transformator after alternating current device LC2 after filtering filtering.
Vector superposed by the output of two inverters, it is achieved the high accuracy of output voltage is controlled, is exported by two inverters
Frequency superposition, it is achieved to output high-frequency harmonic control.
2.: transformator is connected with the booster transformer rising buckling container, and filtered alternating current exports the quilt of photovoltaic plant
Survey generator unit.
3.: theft-resistant link chain loop is the normally closed connection circuit of one group of series connection, and theft-resistant link chain action can trigger emergency shutdown.
(2) grid simulator
1.: as it is shown in figure 5, grid simulator includes A/D modular converter, FPGA and DSP.Wherein,
It is sent to FPGA after A/D modular converter, the voltage signal that variable-frequency power sources is exported and the conversion of current signal data.
FPGA, carries out logical process to voltage signal and current signal, and the signal after processing is sent in DSP.
In the present embodiment, FPGA has signals collecting, A/D conversion, output protection signal and carries out data interaction etc. with DSP
Function.FPGA receives and monitors the signal that the host computer of system sends in photovoltaic plant, and processes, such as, receive host computer
Assign " starting test " On-off signal signal.Voltage, the signal such as electric current of A/D sampling output are carried out at logic by FPGA
Reason, such as, judge zero crossing, thus obtain frequency information voltage signal.Current sampling signal is analyzed, finds electric current
Excessive, then send protection signal.FPGA is also total by data by information such as the voltage gathered, electric current, logical process simultaneously
DSP given by line, such that it is able to calculate voltage, the virtual value of electric current, instantaneous value, and is controlled variable-frequency power sources.
DSP, the output signal of variable-frequency power sources is controlled, and by defeated by the voltage signal and the current signal that send according to FPGA
Go out signal and failure alarm signal is sent to the host computer of monitoring system in photovoltaic plant.
2.: the control mode of DSP includes fundamental mode and harmonic mode.
As it is shown on figure 3, fundamental mode is based on variable-frequency power sources output voltage instantaneous value and the Dual-loop feedback control of output current instantaneous value
Control, use Dual-loop feedback control to control to be possible not only to meet the variable-frequency power sources obtaining high performance index, it is also possible to improve mobile detection
The response speed of system and stability.
As shown in Figure 4, harmonic mode is that closed loop feedback based on variable-frequency power sources output voltage instantaneous value controls.
Harmonic mode carries out the feedforward to instantaneous voltage, to suppress the higher hamonic wave in instantaneous voltage；Feed-forward coefficients is
1-LCω2, L and C is respectively inductance value and the capacitance of wave filter.The negative feedback current feedforward is introduced in current inner loop,
Accelerate inverter dynamic responding speed, strengthen the adaptation ability to linear load disturbance, and effectively reduce the humorous of output voltage
Ripple content.
2, collection control operation device
As shown in Figure 6, including comprehensive protector, and be connected with Control on Communication respectively operating board, PLC device and warm and humid
Degree instrument；Comprehensive protector and communication controler are connected with switch respectively；Switch is detected by Ethernet access photovoltaic plant
Monitoring system host computer.Wherein,
PLC device is with RS485 communication protocol access communications controller, and the on-off model of acquisition operations platform output；
Comprehensive protector passes through ethernet access switch, it is achieved the monitoring of the electric parameters during photovoltaic plant detection, to electricity
The device that abnormal conditions (short circuit, open circuit, phase shortage etc.) in road plays a protective role；Integrated protection in the present embodiment
The number of device is 2.
Communication controler, is sent to the host computer of monitoring system in photovoltaic plant by the output signal of on-off model and humiture instrument
In, complete the exchange conversion to ethernet communication protocol of the RS485 communication protocol.
(1) operating board
Including test/stop knob, point/combined floodgate knob CB1, point/combined floodgate knob CB2, fault involution button and scram button.
Wherein,
1.: test/stopping knob including test node and Stop node, is used, respectively, to initiate detecting system and stop detection system.
2.: point/combined floodgate knob CB1 includes separating brake node CB1 and combined floodgate node CB1.
3.: point/combined floodgate knob CB2 includes separating brake node CB2 and combined floodgate node CB2.
4.: fault involution button, for Manual reset operation after detecting system Failure elimination.
5.: scram button, for the manual stop detection system when breaking down.
Scram button includes normally closed node and normally opened node:
Normally closed node respectively with the theft-resistant link chain loop of variable-frequency power sources in grid disturbance device, combined floodgate node CB1 and combined floodgate node CB2
Series connection；Normally opened node is in parallel with separating brake node CB1 and separating brake node CB2 respectively.
(2) duty of PLC device includes standing-by state, test state, fault case and shutdown state.Monitoring system in photovoltaic plant
Host computer parameter setting values and control instruction are handed down to PLC device by communication controler:
PLC device, according to control instruction and the on-off model of operating board output, is operated State Transferring, arranges according to parameter
Value carries out the parameter of relevant work state and arranges.Ongoing for duty data message is uploaded to photovoltaic electric by PLC device in real time
In the host computer stood.Wherein,
1.: PLC device receives in described operating board point/switching signal of combined floodgate knob CB1 and point/combined floodgate knob CB2 point
After lock signal, work in standing-by state.In the present embodiment, standing-by state is used for characterizing, and mobile detecting system has completed the inspection of disturbance adaptability
Surveying the preparation before on-test, system is in hot stand-by duty.
2.: PLC device receives in described operating board point/switching signal of combined floodgate knob CB1 and point/conjunction of combined floodgate knob CB2
After lock signal, work in test state.Testing state in the present embodiment to be used for characterizing, mobile detecting system has been provided with disturbance adaptability
The logical condition of detection.Under test state.PLC device output variable-frequency power sources enables signal, variable-frequency power sources normal boot-strap, arranges
The corresponding disturbance parameter of grid disturbance device can start test.
3.: PLC device receives in described operating board variable-frequency power sources in the actuating signal of scram button, and grid disturbance device
Theft-resistant link chain loop actuating signal after, work in fault case.Meanwhile, when controlling operation failure, detecting system is also transferred to event
Barrier state.In the present embodiment, fault case is used for characterizing, and abnormal conditions occurs in mobile detecting system.Under fault case, PLC device is divided
Disconnected all choppers, cancel variable-frequency power sources and enable signal.
4.: in the case of scram button and theft-resistant link chain loop are the most not operating, PLC device receives in operating board and tests/stop rotation
After the stopping actuating signal of button, work in shutdown state.Shutting down state in the present embodiment to be used for characterizing, mobile detecting system is in stopping
Running status.
(3) the duty transfer process of PLC device is:
As it is shown in fig. 7, when PLC device original state for shut down state time, point/combined floodgate knob CB1 separating brake, point/combined floodgate knob
CB2 separating brake:
1.: press test/stopping knob, point/combined floodgate knob CB1 closes a floodgate, point/combined floodgate knob CB2 keeps gate-dividing state, movement
Detecting system enters holding state；
2.: point/combined floodgate knob CB1 keeps "on" position, point/combined floodgate knob CB2 closes a floodgate, mobile detecting system enters tests state；
3.: point/combined floodgate knob CB2 keeps "on" position, divides/combined floodgate knob CB1 separating brake or theft-resistant link chain circuit behavior or press
Lower scram button, mobile detecting system enters fault case；
: if theft-resistant link chain loop is not operating and when not pressing scram button, point 4./combined floodgate knob CB1 separating brake, point/combined floodgate knob CB2
Separating brake, pressing fault involution button, press test/stopping knob, mobile detecting system enters shuts down state.
Four, the difference of 4500 meters of atmospheric condition relatively plains regions of height above sea level is very big, to the primary insulation of high pressure equipment, powerful device
Heat radiation brings and must ask, it is therefore desirable to determines the adaptive technique requirement of a kind of high altitude environment equipment next time, specifically includes:
1.: the test of dispatching from the factory of the equipment such as high pressure equipment transformator, switch cubicle, a cable should meet the country after High aititude finishing
Standard.
2.: the primary equipment in mobile detecting system carries out power frequency in container in all devices completes container after vehicle-mounted installation
Voltage-withstand test, primary system (except voltage, current transformer) is all tested according to 85kV insulation, and is surveyed for pressure 1 minute
Examination place is high altitude localities, as in plains region, then carries out height above sea level finishing according to national standard, so that it is guaranteed that equipment entirety peace
The electrical insulation properties safety of process of assembling.
3.: forced air cooling or natural air cooled equipment cooling require 1.5 times of designs according to plains region heat-sinking capability, thus more
Mend the impact that high altitude localities rarefaction of air brings.
Finally should be noted that: described embodiment is only some embodiments of the present application rather than whole embodiments.
Based on the embodiment in the application, those of ordinary skill in the art obtained under not making creative work premise all its
His embodiment, broadly falls into the scope of the application protection.
Claims (9)
1. the mobile detecting system for the test of High aititude photovoltaic plant grid adaptability, it is characterised in that described system bag
Include the blood pressure lowering being connected with electrical network and become the liter buckling container that container generator unit tested with in photovoltaic plant is connected, and collection control
Container；
Described blood pressure lowering becomes container and includes netting side switch cubicle and step-down transformer, described step-down transformer access set control container；
Described liter of buckling container includes pusher side switch cubicle and booster transformer, described booster transformer access set control container；
Described collection control container includes grid disturbance device and collection control operation device；Described grid disturbance device, for simulating grid
Running status；Described collection control operation device, for adjusting the duty of described mobile detecting system.
2. the system as claimed in claim 1, it is characterised in that described grid disturbance device includes variable-frequency power sources and electrical network simulation
Device；Described variable-frequency power sources includes theft-resistant link chain loop, and the first branch road of being connected with transformator respectively and the second branch road；
Described grid simulator, regulates frequency, amplitude and the phase place of inverter output AC electricity in described variable-frequency power sources；By first
The alternating current of branch road output and the alternating current superposition of the second branch road output, be met the alternating current of testing requirement.
3. system as claimed in claim 2, it is characterised in that electric capacity C1 that described first branch road includes being sequentially connected with, inverse
Become device PWM1 and wave filter LC1；Filtered for electric capacity C1 DC inverter is alternating current by described inverter PWM1, institute
Access in described transformator after stating alternating current device LC1 after filtering filtering；
Described first branch road includes electric capacity C2, inverter PWM2 and the wave filter LC2 being sequentially connected with；Described inverter PWM2
It is alternating current by filtered for electric capacity C2 DC inverter, after described alternating current device LC2 after filtering filtering, accesses described transformation
In device；
Described transformator is connected with the booster transformer risen in buckling container, and filtered alternating current is exported photovoltaic plant
Tested generator unit.
4. system as claimed in claim 2, it is characterised in that described grid simulator includes A/D modular converter, FPGA
And DSP；Described A/D modular converter, the voltage signal exporting described variable-frequency power sources and current signal are sent out after carrying out data conversion
Deliver to FPGA；Described FPGA, carries out logical process to described voltage signal and current signal；
Described DSP, the voltage signal sent according to described FPGA and current signal, control the output signal of described variable-frequency power sources,
And described output signal and failure alarm signal are sent to the monitoring system of photovoltaic plant；
The control mode of described DSP includes fundamental mode and harmonic mode.
5. system as claimed in claim 4, it is characterised in that described fundamental mode, for based on variable-frequency power sources output voltage wink
The Dual-loop feedback control of duration and output current instantaneous value controls；
Described harmonic mode, controls for closed loop feedback based on variable-frequency power sources output voltage instantaneous value；Described harmonic mode is to described
Instantaneous voltage carries out the feedforward, to suppress the higher hamonic wave in described instantaneous voltage；Feed-forward coefficients is 1-LC ω2, described
L and C is respectively inductance value and the capacitance of wave filter.
6. the system as claimed in claim 1, it is characterised in that described collection control operation device includes comprehensive protector, and
Operating board, PLC device and the humiture instrument being connected with communication controler respectively；Described comprehensive protector and communication controler divide
It is not connected with switch；The described switch monitoring system by Ethernet access photovoltaic plant；
Described PLC device, receives the control instruction that described monitoring system issues, the on-off model of acquisition operations platform output, depends on
The duty of PLC is adjusted according to described control instruction and on-off model；
Described communication controler, is sent to the monitoring system of photovoltaic plant by the output signal of described on-off model and humiture instrument.
7. system as claimed in claim 6, it is characterised in that described operating board includes test/stopping knob, divides/close a floodgate rotation
Button CB1, point/combined floodgate knob CB2, fault involution button and scram button；
Described test/stopping knob including test node and Stop node, is used, respectively, to initiate detecting system and stop detection system；
Described point/combined floodgate knob CB1 includes separating brake node CB1 and combined floodgate node CB1；
Described point/combined floodgate knob CB2 includes separating brake node CB2 and combined floodgate node CB2；
Described fault involution button, for Manual reset operation after detecting system Failure elimination；
Described scram button, for the manual stop detection system when breaking down.
8. system as claimed in claim 7, it is characterised in that described scram button includes normally closed node and normally opened node；
Described normally closed node respectively with the theft-resistant link chain loop of variable-frequency power sources in grid disturbance device, and combined floodgate node CB1 and combined floodgate
Node CB2 connects；Described normally opened node is in parallel with separating brake node CB1 and separating brake node CB2 respectively.
9. system as claimed in claim 6, it is characterised in that the duty of described PLC device includes standing-by state, examination
Test state, fault case and shutdown state；
Described PLC device receives in described operating board point/switching signal of combined floodgate knob CB1 and point/combined floodgate knob CB2 point
After lock signal, work in standing-by state；
Described PLC device receives in described operating board point/switching signal of combined floodgate knob CB1 and point/conjunction of combined floodgate knob CB2
After lock signal, work in test state；
Described PLC device receives in described operating board variable-frequency power sources in the actuating signal of scram button, and grid disturbance device
Theft-resistant link chain loop actuating signal after, work in fault case；
In the case of described scram button and theft-resistant link chain loop are the most not operating, described PLC device receives described operating board pilot scale
After testing/stop the stopping actuating signal of knob, work in shutdown state.
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