CN104078997A - Photovoltaic grid-connected inverter grid-disconnecting mode and grid-connecting mode switching control method - Google Patents
Photovoltaic grid-connected inverter grid-disconnecting mode and grid-connecting mode switching control method Download PDFInfo
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- CN104078997A CN104078997A CN201410298778.5A CN201410298778A CN104078997A CN 104078997 A CN104078997 A CN 104078997A CN 201410298778 A CN201410298778 A CN 201410298778A CN 104078997 A CN104078997 A CN 104078997A
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- Y—GENERAL 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention relates to a photovoltaic grid-connected inverter grid-disconnecting mode and grid-connecting mode switching control method and belongs to the technical field of photovoltaic power generation. At a grid-connecting operation stage, an inverter records the amplitude value and the frequency in real time when grid side voltage is normal, when a power grid is in power failure, a grid side voltage phase angle is recorded, and the grid side voltage phase angle is used as an alternating-current voltage control instruction during a grid-disconnecting control process for achieving smooth switching from grid connecting to grid disconnecting. At a grid-disconnecting operation stage, the inverter detects a grid side voltage state in real time, when the power grid is electrified, the inverter carries out synchronous control over a load side voltage amplitude phase and grid side voltage, when load voltage and grid side voltage are in the same amplitude and the same phase, a grid side switch is closed, a control mode is converted from an alternating voltage control mode to an MPPT control mode, and smooth switching of the inverter from grid disconnecting to grid connecting is achieved.
Description
Technical field
The present invention relates to a kind of photovoltaic combining inverter from net and grid-connected mode switch control method, belong to photovoltaic power generation technology field.
Background technology
Along with the continuous aggravation of global problem of environmental pollution and fossil energy crisis, clean regenerative resource has obtained paying close attention to widely.China is vast in territory, between honourable regenerative resource enrichment region and load center district, is contrary distribution, makes large-scale honourable power station just can send to load side by high pressure long distance power transmission corridor.Due to features such as non-linear, the randomness of wind speed and intensity of illumination and uncontrollabilities, the access in large-scale honourable power station has brought no small challenge to electric power system stable.In recent years, the frequent wind energy turbine set accident occurring makes the grid-connected hourage of Large Scale Wind Farm Integration on the low side, and abandoning in a large number wind not only affects the recovery of cost of investment, also causes the huge wasting of resources.Therefore, " dispersion access, the on-site elimination " of new forms of energy distributed power source caused widely and paid close attention to.
Isolated island is the problem of paying close attention in distributed generation system, and it relates to personal safety and electric equipment safety.IEEE Std.929-2000 standard points out, in the time isolated island being detected, distributed generation system must hard stop, thereby stops to isolated grid charging, and this situation is called passive island mode.But, the power supply reliability meeting in order to improve distributed generation system key around, it is no longer a feasible scheme that isolated island generation relief distributed generation system is shut down.And then IEEE Std.1547-2003 standard has proposed the initiatively concept of isolated island.In this case, when detecting after isolated island, distributed generation system should disconnect with electrical network, continues to local critical load power supply.
Under active alone island pattern (from net pattern), device runs on determines alternating voltage control model, and now inverter is given local critical load power supply as alternating-current voltage source; When after power system restoration, after the same homophase frequently of device control AC voltage and line voltage, can merge net switch and proceed to the pattern of being incorporated into the power networks.How to realize inverter by the incision of grid-connected pattern from net pattern and to realize seamless switching by the smooth excessiveness of cutting grid-connected pattern from net pattern most important.
Summary of the invention
The object of this invention is to provide a kind of photovoltaic combining inverter from net and grid-connected mode switch control method, cut from net pattern and by the seamless switching of cutting grid-connected pattern from net pattern by grid-connected pattern to realize inverter.
The present invention provides a kind of photovoltaic combining inverter from net and grid-connected mode switch control method for solving the problems of the technologies described above, and this method for handover control comprises the following steps:
1) at inverter under the pattern of being incorporated into the power networks, detect in real time amplitude and the frequency of voltage on line side, and the amplitude of the voltage on line side that detects of judgement and frequency are whether in normal range (NR);
2) if exceed normal range (NR), disconnect net side switch, and by inverter by MPPT control mode switch to exchanging voltage mode control, make inverter by grid-connected pattern to taking over seamlessly from net pattern;
3), when inverter is under net alternating voltage control model, in real time amplitude and the frequency of detection of grid voltage, judges that line voltage amplitude or frequency are whether in normal range (NR);
4) if the line voltage amplitude detecting or frequency, in normal range (NR), adopt alternating voltage Synchronization Control to inverter, make load voltage and grid side voltage with amplitude same-phase;
5), when load voltage and grid side voltage are during with amplitude same-phase, closed net side switch, by alternating voltage control mode switch value MPPT control model, realizes inverter by from net to grid-connected taking over seamlessly by inverter.
Described step 2) in be during using electric network power-fail the grid side voltage magnitude that detected and frequency information as the control command of alternating voltage.
The amplitude of described voltage on line side and the normal range (NR) of frequency refer to voltage magnitude average and the frequency average when normal in the continuous setting-up time of line voltage.
Described step 4) in alternating voltage Synchronization Control refer to the closed-loop control of electric voltage frequency and amplitude, according to the frequency of actual electric network, load-side mains frequency is controlled, realize the Synchronization Control of load side voltage and line voltage, with the impact of line voltage in eliminating from net to grid-connected handoff procedure.
Described step 5) in current instruction value while being closed using grid side switch cut grid-connected pattern as the initial value of grid-connected control outer shroud.
The invention has the beneficial effects as follows: amplitude and the frequency of the present invention in the time that the stage of being incorporated into the power networks, inverter real time record voltage on line side was normal, in the time of electric network power-fail, record voltage on line side phase angle, the instruction using this as alternating voltage control in net control procedure realizes inverter by grid-connected extremely off-grid taking over seamlessly; From the network operation stage, inverter detects voltage on line side state in real time, after electrical network powers on, inverter carries out the Synchronization Control of load side voltage amplitude phase place and voltage on line side, until load voltage and voltage on line side closed net side switch during with amplitude same-phase, control model is converted into MPPT control model by alternating voltage control model, and inverter is realized by from net to grid-connected taking over seamlessly.
By the alternating voltage synchronization control algorithm adopting in from net to grid-connected pattern handoff procedure, adopt the closed-loop control of electric voltage frequency and amplitude, in Frequency Synchronization process according to the frequency of actual electric network, realize the control to load-side mains frequency, and then realize the Synchronization Control of load side voltage and line voltage, and then realize by line voltage in from net to grid-connected handoff procedure without impulsive control.Inverter is before electric network power-fail isolated island occurs, record the normal moment net of electrical network and survey voltage magnitude and phase place, in the time of electric network power-fail, using this as alternating voltage control command, switch to rapidly alternating voltage control model, guaranteed that grid-connected pattern is to seamlessly transitting from net pattern.The present invention is not only applicable to centralized photovoltaic combining inverter, is applicable to organize string data photovoltaic combining inverter yet.
Brief description of the drawings
Fig. 1 is that photovoltaic combining inverter is for grid-connected and major loop winding diagram that mutually switch from net pattern;
Fig. 2 is the control block diagram of photovoltaic combining inverter;
Fig. 3 is that photovoltaic combining inverter is switched to from the flow chart of net pattern by grid-connected pattern;
Fig. 4 is that photovoltaic combining inverter is by the flow chart that switches to grid-connected pattern from net pattern.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described.
The present embodiment is taking centralized two level photovoltaic grid-connected inverters as example, if Fig. 1 is major loop winding diagram.Photovoltaic combining inverter comprises inverter body, inverter AC load side switch and grid side switch.Wherein grid side alternating-current switch is used for when after electric network power-fail, and disconnection inverter load-side is connected with electrical network.In addition, inverter is except need to also needing to increase grid side voltage sample in order to monitor line voltage state in order to complete local control the load side voltage electric current that carries out, array voltage current sample.The present invention has provided distributed photovoltaic combining inverter and has detected after island effect occurs how to realize by grid-connected pattern to taking over seamlessly from net pattern, as shown in Figure 3, and when detecting after line voltage recovers, how to realize by taking over seamlessly from net pattern to grid-connected pattern, as shown in Figure 4 by inverter.
A kind of photovoltaic combining inverter of the present invention is as follows from the specific implementation process of net and grid-connected mode switch control method.
1. when inverter is under the pattern of being incorporated into the power networks
1) detection of grid voltage U
ag, U
bg, U
cgamplitude and frequency;
2) record in the continuous 5S of line voltage voltage magnitude average U and the frequency average f when normal;
3) detect voltage on line side U
ag, U
bg, U
cgvoltage magnitude and frequency in normal range (NR), (setting of this amplitude and frequency is taking the rated voltage amplitude of inverter access electrical network and frequency as benchmark, the normal fluctuation range of voltage), if line voltage amplitude and frequency exist extremely, perform step 4), if normally, return to step 1);
4) record electric network voltage phase now
disconnect net side switch QF2;
5) inverter by MPPT control mode switch to exchanging voltage mode control, and by electric network voltage phase
and amplitude U and frequency f information is as the instruction of alternating voltage control, so realize inverter by grid-connected to from the taking over seamlessly of net pattern, guarantee the level and smooth uninterrupted of load supplying.
2. when inverter is under net alternating voltage control model
1) line voltage Uabc amplitude and frequency detecting;
2) electrical network amplitude or frequency normally proceed to step 3), extremely proceed to step 1);
3) carry out alternating voltage amplitude Synchronization Control, first make to hand over load side voltage U by alternating voltage control model
aL, U
bL, U
cLwith grid side voltage U
ag, U
bg, U
cgamplitude is consistent;
4) carry out the control of alternating voltage Phase synchronization, the control method adopting is: make f by control
load<f
grid(as being 50.1Hz by detection of grid electric voltage frequency, load voltage frequency can be controlled in the little value of sheet or value bigger than normal within the scope of the normal running frequency of load, selects F in this method
load=F
grid-0.5Hz);
5) load voltage and line voltage amplitude and phase difference detection enters step 6 in the time that voltage amplitude value difference <Uerr and phase angle difference are less than α), on the contrary finish to carry out cycle detection next time;
6) closed grid side switch QF2;
7) record electric current loop command value now, the initial order value using this as grid-connected control outer shroud is cut grid-connected pattern.
The control that above-mentioned handoff procedure inverter of the present invention adopts as shown in Figure 2, inverter is before electric network power-fail isolated island occurs, record the normal moment net of electrical network and survey voltage magnitude and phase place, in the time of electric network power-fail using this as alternating voltage control command, switch to rapidly alternating voltage control model, guaranteed that grid-connected pattern is to seamlessly transitting from net pattern; By the alternating voltage synchronization control algorithm adopting in from net to grid-connected pattern handoff procedure, adopt the closed-loop control of electric voltage frequency and amplitude, in Frequency Synchronization process according to the frequency of actual electric network, realize the control to load-side mains frequency, and then realize the Synchronization Control of load side voltage and line voltage, and then realize by line voltage in from net to grid-connected handoff procedure without impulsive control.
What more than enumerate is only several specific embodiments of the present invention; the invention is not restricted to above embodiment; can also have many distortion, all distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention, all should think protection scope of the present invention.
Claims (5)
1. photovoltaic combining inverter, from net and a grid-connected mode switch control method, is characterized in that, this method for handover control comprises the following steps:
1) at inverter under the pattern of being incorporated into the power networks, detect in real time amplitude and the frequency of voltage on line side, and the amplitude of the voltage on line side that detects of judgement and frequency are whether in normal range (NR);
2) if exceed normal range (NR), disconnect net side switch, and by inverter by MPPT control mode switch to exchanging voltage mode control, make inverter by grid-connected pattern to taking over seamlessly from net pattern;
3), when inverter is under net alternating voltage control model, in real time amplitude and the frequency of detection of grid voltage, judges that line voltage amplitude or frequency are whether in normal range (NR);
4) if the line voltage amplitude detecting or frequency, in normal range (NR), adopt alternating voltage Synchronization Control to inverter, make load voltage and grid side voltage with amplitude same-phase;
5), when load voltage and grid side voltage are during with amplitude same-phase, closed net side switch, by alternating voltage control mode switch value MPPT control model, realizes inverter by from net to grid-connected taking over seamlessly by inverter.
2. photovoltaic combining inverter according to claim 1, from net and grid-connected mode switch control method, is characterized in that, described step 2) in be during using electric network power-fail the grid side voltage magnitude that detected and frequency information as the control command of alternating voltage.
3. photovoltaic combining inverter according to claim 1 is from net and grid-connected mode switch control method, it is characterized in that, the amplitude of described voltage on line side and the normal range (NR) of frequency refer to voltage magnitude average and the frequency average when normal in the continuous setting-up time of line voltage.
4. photovoltaic combining inverter according to claim 2 is from net and grid-connected mode switch control method, it is characterized in that, described step 4) in alternating voltage Synchronization Control refer to the closed-loop control of electric voltage frequency and amplitude, according to the frequency of actual electric network, load-side mains frequency is controlled, realize the Synchronization Control of load side voltage and line voltage, with the impact of line voltage in eliminating from net to grid-connected handoff procedure.
5. photovoltaic combining inverter according to claim 4, from net and grid-connected mode switch control method, is characterized in that, described step 5) in current instruction value while being closed using grid side switch cut grid-connected pattern as the initial value of grid-connected control outer shroud.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868840A (en) * | 2015-05-12 | 2015-08-26 | 江苏固德威电源科技有限公司 | Photovoltaic energy storage inverter off-grid MPPT perturbation method |
| CN105207261A (en) * | 2015-09-28 | 2015-12-30 | 广东电网有限责任公司电力科学研究院 | Off-grid and grid-connection control method and system for virtual synchronous generator |
| CN105762829A (en) * | 2014-12-16 | 2016-07-13 | 中国科学院沈阳自动化研究所 | Microgrid inverter grid disconnection/connection seamless switching control method based on phase angle estimation |
| TWI550999B (en) * | 2015-10-22 | 2016-09-21 | 行政院原子能委員會核能研究所 | Controller of frequency distributed detection and all-black prevention for microgrid |
| CN106849155A (en) * | 2015-12-01 | 2017-06-13 | Det 国际控股有限公司 | For the controller of inverter |
| WO2017128579A1 (en) * | 2016-01-26 | 2017-08-03 | 漳州科华技术有限责任公司 | Inverter output overcurrent protection method |
| CN107026475A (en) * | 2017-05-15 | 2017-08-08 | 昆明理工大学 | A kind of distributed solar electricity generation system enters network control method |
| CN107332283A (en) * | 2017-08-24 | 2017-11-07 | 泰州学院 | Shore electric power is smoothly incorporated to the synchronisation control means of network of ship |
| CN108667055A (en) * | 2017-03-30 | 2018-10-16 | 先控捷联电气股份有限公司 | And the uninterrupted switching device of off-network and method |
| CN105978024B (en) * | 2016-06-07 | 2018-10-23 | 东南大学 | A kind of energy storage inverter based on complex variable and off-network seamless switching control algolithm |
| CN109412205A (en) * | 2018-11-14 | 2019-03-01 | 苏州中储普华电力科技有限公司 | Energy accumulation current converter and off-network switching method |
| CN110401223A (en) * | 2019-07-31 | 2019-11-01 | 珠海格力电器股份有限公司 | Control method, control device and the photovoltaic system of photovoltaic system |
| CN110739714A (en) * | 2019-10-23 | 2020-01-31 | 南方电网科学研究院有限责任公司 | Online smooth switching method for islanding and networking modes of flexible direct converter valves |
| CN113346531A (en) * | 2021-06-23 | 2021-09-03 | 新风光电子科技股份有限公司 | Active grid-connected and off-grid switching method for cascaded energy storage system |
| CN115021321A (en) * | 2022-07-11 | 2022-09-06 | 扬州越达检测设备科技有限公司 | Grid-connected and off-grid switching control method for grid-connected power electronic converter |
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| CN105762829B (en) * | 2014-12-16 | 2018-01-02 | 中国科学院沈阳自动化研究所 | Microgrid inverter based on phase angle estimation is from grid-connected seamless switching control method |
| CN105762829A (en) * | 2014-12-16 | 2016-07-13 | 中国科学院沈阳自动化研究所 | Microgrid inverter grid disconnection/connection seamless switching control method based on phase angle estimation |
| CN104868840B (en) * | 2015-05-12 | 2016-08-24 | 江苏固德威电源科技股份有限公司 | Photovoltaic energy storage inverter off-network MPPT perturbation motion method |
| CN104868840A (en) * | 2015-05-12 | 2015-08-26 | 江苏固德威电源科技有限公司 | Photovoltaic energy storage inverter off-grid MPPT perturbation method |
| CN105207261A (en) * | 2015-09-28 | 2015-12-30 | 广东电网有限责任公司电力科学研究院 | Off-grid and grid-connection control method and system for virtual synchronous generator |
| TWI550999B (en) * | 2015-10-22 | 2016-09-21 | 行政院原子能委員會核能研究所 | Controller of frequency distributed detection and all-black prevention for microgrid |
| CN106849155A (en) * | 2015-12-01 | 2017-06-13 | Det 国际控股有限公司 | For the controller of inverter |
| WO2017128579A1 (en) * | 2016-01-26 | 2017-08-03 | 漳州科华技术有限责任公司 | Inverter output overcurrent protection method |
| CN105978024B (en) * | 2016-06-07 | 2018-10-23 | 东南大学 | A kind of energy storage inverter based on complex variable and off-network seamless switching control algolithm |
| CN108667055A (en) * | 2017-03-30 | 2018-10-16 | 先控捷联电气股份有限公司 | And the uninterrupted switching device of off-network and method |
| CN107026475A (en) * | 2017-05-15 | 2017-08-08 | 昆明理工大学 | A kind of distributed solar electricity generation system enters network control method |
| CN107026475B (en) * | 2017-05-15 | 2019-11-08 | 昆明理工大学 | A kind of distributed solar electricity generation system enters network control method |
| CN107332283A (en) * | 2017-08-24 | 2017-11-07 | 泰州学院 | Shore electric power is smoothly incorporated to the synchronisation control means of network of ship |
| CN107332283B (en) * | 2017-08-24 | 2020-04-17 | 泰州学院 | Synchronous control method for smoothly merging shore power supply into ship power grid |
| CN109412205A (en) * | 2018-11-14 | 2019-03-01 | 苏州中储普华电力科技有限公司 | Energy accumulation current converter and off-network switching method |
| CN109412205B (en) * | 2018-11-14 | 2019-08-27 | 苏州中储普华电力科技有限公司 | Energy accumulation current converter and off-network switching method |
| CN110401223A (en) * | 2019-07-31 | 2019-11-01 | 珠海格力电器股份有限公司 | Control method, control device and the photovoltaic system of photovoltaic system |
| CN110401223B (en) * | 2019-07-31 | 2021-04-27 | 珠海格力电器股份有限公司 | Control method and control device of photovoltaic system and photovoltaic system |
| CN110739714A (en) * | 2019-10-23 | 2020-01-31 | 南方电网科学研究院有限责任公司 | Online smooth switching method for islanding and networking modes of flexible direct converter valves |
| CN113346531A (en) * | 2021-06-23 | 2021-09-03 | 新风光电子科技股份有限公司 | Active grid-connected and off-grid switching method for cascaded energy storage system |
| CN113346531B (en) * | 2021-06-23 | 2023-10-24 | 新风光电子科技股份有限公司 | Active parallel-to-off-grid switching method for cascade energy storage system |
| CN115021321A (en) * | 2022-07-11 | 2022-09-06 | 扬州越达检测设备科技有限公司 | Grid-connected and off-grid switching control method for grid-connected power electronic converter |
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Application publication date: 20141001 |