CN105896593B - Photovoltaic combining inverter multi-machine parallel connection runs control method for coordinating - Google Patents

Photovoltaic combining inverter multi-machine parallel connection runs control method for coordinating Download PDF

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Publication number
CN105896593B
CN105896593B CN201610194509.3A CN201610194509A CN105896593B CN 105896593 B CN105896593 B CN 105896593B CN 201610194509 A CN201610194509 A CN 201610194509A CN 105896593 B CN105896593 B CN 105896593B
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China
Prior art keywords
photovoltaic combining
inverter
peripheral hardwares
control device
epwm
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CN201610194509.3A
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Chinese (zh)
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CN105896593A (en
Inventor
黄敏
方刚
郝齐心
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江苏固德威电源科技股份有限公司
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion electric or electronic aspects
    • Y02E10/563Power conversion electric or electronic aspects for grid-connected applications

Abstract

The present invention relates to a kind of photovoltaic combining inverter multi-machine parallel connections to run control method for coordinating, coordination control is carried out for the more photovoltaic combining inverters to parallel running, photovoltaic combining inverter is controlled by the circuit control device with ePWM peripheral hardwares that it is correspondingly connected with, and method is:Synchronizing signal using network voltage zero cross signal as ePWM peripheral hardwares, the clock counter of ePWM peripheral hardwares is set to complete to synchronize in network voltage zero cross signal arrival moment auto-initiation, to trigger the interrupt service routine in circuit control device by the clock counter of ePWM peripheral hardwares, to complete the control of the coordination to more photovoltaic combining inverters of parallel running.Network voltage zero cross signal is introduced ePWM peripheral hardwares by the present invention, to trigger the interrupt action of circuit control device, it can not only ensure the real-time for coordinating control, and the control software part of circuit control device is without change, it is easily achieved, cost is relatively low, disclosure satisfy that multi-inverter is coordinated control and required.

Description

Photovoltaic combining inverter multi-machine parallel connection runs control method for coordinating

Technical field

The invention belongs to field of photovoltaic power generation, and in particular to when one kind being applied to the operation of photovoltaic combining inverter multi-machine parallel connection Carry out the method that multimachine coordinates control.

Background technology

When large-capacity distributing photovoltaic generating system designs, it is public by power grid that more photovoltaic combining inverters can be chosen Tie point parallel running, typical single-phase photovoltaic inverter parallel running system are shown in Fig. 1.Non-isolation type inverter parallel When, exist between inverter circuit and be directly coupled relationship, there is also distributed constant impedances for transmission line of electricity, to make multi-inverter Distributed generation system in parallel forms a complicated Higher-Order Circuit network.The presence of Higher-Order Circuit network may make distribution Formula electricity generation system generates abnormal operating status, or even system is made to generate resonance.The reason of resonance is that Higher-Order Circuit network is deposited In uncertain resonance point, the independence and randomness of every inverter output cause the uncertain of harmonic frequency and amplitude Property, when harmonic frequency is located near resonance point, harmonic wave can be amplified generation resonance.It is to keep parallel connection inverse to inhibit one of the measure of resonance It is consistent to become device output response, reduces the uncertainty of inverter output.Therefore it needs to coordinate the inverter of parallel running Control.

More shunt chopper output responses are kept to synchronize, current control method for coordinating has:1, increase shunt chopper External master control signal, this method can bring the increase of hardware cost, and when signal transmssion line farther out when may cause declining for signal Subtract, and the error of control can be brought, if external signal cannot reach each inverter simultaneously, inverter can not be completed to coordinate control Action, can not meet real-time;2, each inverter is controlled using FPGA controller, this method can ensure to coordinate the real-time of control Property, but it is more complicated using writing for hardware description language completion inverter control algorithm, the difficulty of product development is increased, The cost of system is increased, feasibility is not high.

Invention content

The object of the present invention is to provide it is a kind of it is easy to use, meet multi-inverter and coordinate control and require and lower-cost light It lies prostrate gird-connected inverter multi-machine parallel connection and runs control method for coordinating.

In order to achieve the above objectives, the technical solution adopted by the present invention is:

A kind of photovoltaic combining inverter multi-machine parallel connection operation control method for coordinating, simultaneously for the more photovoltaics to parallel running Net inverter carries out coordination control, the inverter control with ePWM peripheral hardwares that the photovoltaic combining inverter is correspondingly connected with by it Device processed is controlled, and the method is:Synchronizing signal using network voltage zero cross signal as the ePWM peripheral hardwares makes described The clock counter of ePWM peripheral hardwares is completed to synchronize in network voltage zero cross signal arrival moment auto-initiation, to logical The clock counter for crossing the ePWM peripheral hardwares triggers interrupt service routine in the circuit control device, to complete pair and a through transport The coordination of the more capable photovoltaic combining inverters controls.

Preferably, the method is realized by following steps:

Step 1:GPIO mouthfuls of configurations are carried out to the circuit control device, are configured to ePWM peripheral hardware pins;

Step 2:It is that external signal triggers its clock counter synchronisation pattern by the ePWM peripheral configurations;

Step 3:The circuit control device is completed initialization program and is simultaneously run, when the ePWM peripheral hardwares detect it is described When network voltage zero cross signal, clock counter O reset initialization, completion one is subsynchronous, to trigger the circuit control device In interrupt service routine, complete the coordination to more photovoltaic combining inverters of parallel running and control.

Since above-mentioned technical proposal is used, the present invention has following advantages compared with prior art:The present invention is electric by power grid It presses through zero-signal and introduces ePWM peripheral hardwares, to trigger the interrupt action of circuit control device, can not only ensure to coordinate control Real-time, and the control software part of circuit control device without change, it is easy to accomplish, cost is relatively low, how inverse disclosure satisfy that Become device and coordinates control requirement.

Description of the drawings

Attached drawing 1 is single-phase photovoltaic inverter parallel running system schematic.

Attached drawing 2 is the schematic diagram of network voltage zero cross signal.

Attached drawing 3 is circuit control device initial configuration and program operational process diagram in the present invention.

Attached drawing 4 is that the photovoltaic combining inverter multi-machine parallel connection of the present invention runs the flow chart of control method for coordinating.

Attached drawing 5 is the synchronization action schematic diagram of the peripheral clock counter of multi-inverter controller in the present invention.

Attached drawing 6 is two photovoltaic combining inverters and machine operation output current oscillograph wave before method using the present invention Shape.

Attached drawing 7 is two photovoltaic combining inverters and machine operation output current oscillograph wave after method using the present invention Shape.

Specific implementation mode

With reference to embodiment, the invention will be further described.

In large-capacity distributing photovoltaic generating system, more(At least two)Photovoltaic combining inverter is public by power grid Tie point and parallel running, photovoltaic combining inverter are carried out by the circuit control device with ePWM peripheral hardwares that it is correspondingly connected with Control.

It is a kind of to be used to that more photovoltaic combining inverters of above-mentioned this parallel running to be carried out to coordinate the grid-connected of control Inverter multi-machine parallel connection runs control method for coordinating, is:Using network voltage zero cross signal as shown in Fig. 2 as ePWM outside If synchronizing signal, so that the clock counters of ePWM peripheral hardwares is arrived moment auto-initiation in network voltage zero cross signal and is completed Synchronous, the clock counter to pass through ePWM peripheral hardwares triggers the interrupt service routine in circuit control device, to complete pair simultaneously The coordination of more photovoltaic combining inverters of through transport row controls, as shown in figures 4 and 5.Here, circuit control device uses The dsp chip of the model TMS320F28035 of TI companies.

As shown in attached drawing 3 and attached drawing 4, the above method is realized by following steps:

Step 1:GPIO mouthfuls of configurations are carried out to circuit control device, are configured to ePWM peripheral hardware pins;

Step 2:It is that external signal triggers its clock counter synchronisation pattern by ePWM peripheral configurations;

Step 3:Circuit control device is completed initialization program and is run, when ePWM peripheral hardwares detect network voltage zero passage When signal, the primary of multi-inverter controller DSP chip peripheral clock counters is completed in clock counter O reset initialization Synchronous, when clock counter meets down trigger condition, triggering circuit control device executes interrupt service routine therein, complete The coordination control of more photovoltaic combining inverters of pairs of parallel running.

This programme was initialized to clock counter at the network voltage zero cross signal arrival moment, when initialization occurs In a cycle after quarter of short duration influence can be caused on the IGBT driving pulses of output.Photovoltaic combining inverter is generally with unit Power factor state is incorporated into the power networks, and for single-phase photovoltaic grid-connected inverter, when network voltage zero passage, inverter output current is big It is small also in zero crossings, i.e. output current instantaneous value is smaller.When network voltage zero cross signal arrives the moment in controller execution When before and after disconnected service routine near the moment, the influence that IGBT driving pulses are exported for inverter reaches extreme instants, respectively can Caused on the basis of original 3/2 period delay or 1/2 period it is advanced(Inverter 1 and inverter 2TCR are counted as shown in Figure 4 Device waveform).But network voltage zero-acrross ing moment inverter output current instantaneous value is smaller, i.e., circuit control device output duty cycle compared with It is small or 0, and inverter is due to using closed-loop current control, caused by the small distortion for signal period IGBT driving pulses The small distortion of output current, circuit control device can adjust completely, therefore this method will not make inverter output substantially At influence.

This programme overcomes the problem of increasing external coordination control signal and increasing hardware cost, and network voltage zero passage is believed The ePWM peripheral hardwares of circuit control device number are introduced, the whole coordination that inverter multi-machine parallel connection is automatically performed by hardware controls, ensures Coordinate the real-time of control, and the control section of software is without any change, it is easy to accomplish.

Fig. 5 is 2 inverters and machine operation output current waveform, Fig. 6 are to increase before the method for increasing this programme 2 inverters and machine output current waveform after the method for this programme, wherein CH1 are network voltage, and CH2, CH3 are respectively 2 machine output currents.

The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.

Claims (2)

1. a kind of photovoltaic combining inverter multi-machine parallel connection runs control method for coordinating, grid-connected for more to parallel running Inverter carries out coordination control, the inverter control with ePWM peripheral hardwares that the photovoltaic combining inverter is correspondingly connected with by it Device is controlled, it is characterised in that:The method is:Synchronous letter using network voltage zero cross signal as the ePWM peripheral hardwares Number, so that the clock counter of the ePWM peripheral hardwares is completed same in network voltage zero cross signal arrival moment auto-initiation Step has been come to trigger the interrupt service routine in the circuit control device by the clock counter of the ePWM peripheral hardwares The coordination control of the more photovoltaic combining inverters of pairs of parallel running.
2. photovoltaic combining inverter multi-machine parallel connection according to claim 1 runs control method for coordinating, it is characterised in that:Institute Method is stated to realize by following steps:
Step 1:GPIO mouthfuls of configurations are carried out to the circuit control device, are configured to ePWM peripheral hardware pins;
Step 2:It is that external signal triggers its clock counter synchronisation pattern by the ePWM peripheral configurations;
Step 3:The circuit control device is completed initialization program and is run, when the ePWM peripheral hardwares detect the power grid When voltage zero-crossing signal, clock counter O reset initialization, completion one is subsynchronous, to trigger in the circuit control device Interrupt service routine is completed the coordination to the more photovoltaic combining inverters of parallel running and is controlled.
CN201610194509.3A 2016-03-31 2016-03-31 Photovoltaic combining inverter multi-machine parallel connection runs control method for coordinating CN105896593B (en)

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CN108336760B (en) * 2018-03-29 2019-08-23 山东大学 A kind of no-voltage sampling coordinated control system and method for more gird-connected inverters
CN108448618A (en) * 2018-04-02 2018-08-24 杭州康奋威科技股份有限公司 The method of multi-computer system detection isolated island based on simultaneous perturbation curve

Citations (3)

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CN102611134A (en) * 2012-03-13 2012-07-25 电子科技大学 Network voltage phase-frequency tracking method based on capturing unit
CN104122445A (en) * 2013-04-25 2014-10-29 长沙理工大学 Novel photovoltaic grid-connected system phase detecting circuit and phase locking method
CN204465020U (en) * 2015-04-10 2015-07-08 西安科技大学 A kind of grid-connected control device

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US10027114B2 (en) * 2012-10-25 2018-07-17 Mpowersolar Inc. Master slave architecture for distributed DC to AC power conversion

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
CN102611134A (en) * 2012-03-13 2012-07-25 电子科技大学 Network voltage phase-frequency tracking method based on capturing unit
CN104122445A (en) * 2013-04-25 2014-10-29 长沙理工大学 Novel photovoltaic grid-connected system phase detecting circuit and phase locking method
CN204465020U (en) * 2015-04-10 2015-07-08 西安科技大学 A kind of grid-connected control device

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