CN103701155B - A kind of photovoltaic combining inverter active power dispatch control method - Google Patents
A kind of photovoltaic combining inverter active power dispatch control method Download PDFInfo
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- CN103701155B CN103701155B CN201310474406.9A CN201310474406A CN103701155B CN 103701155 B CN103701155 B CN 103701155B CN 201310474406 A CN201310474406 A CN 201310474406A CN 103701155 B CN103701155 B CN 103701155B
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 present invention relates to a kind of photovoltaic combining inverter active power dispatch control method, the present invention still is based on existing outer voltage, current inner loop and DQ decoupler shaft control method, merged power ring control simultaneously, combining inverter output is directly controlled, and realize seamless switching between MPPT and dispatch state by the switching of internal ring and DC bus-bar voltage outer shroud, and guarantee seriality and the continuity of active power of output of internal ring D axle instruction during switching, reach to smooth, the purpose of stable switching.
Description
Technical field
The present invention relates to a kind of photovoltaic combining inverter active power dispatch control method.
Background technology
Possess the features such as intermittence, randomness, undulatory property due to photovoltaic generation, photovoltaic plant especially accesses the big-and-middle-sized centralized photovoltaic plant of power system, will bring many adverse effects to the operation of electrical network.For ensureing the frequency stable of electrical network, photovoltaic plant need to possess the ability regulating its active power of output according to power dispatching station instruction.
Photovoltaic combining inverter is the power control unit of photovoltaic plant, therefore, it is necessary to require that photovoltaic DC-to-AC converter possesses active power scheduling feature, and dispatching response process answers smooth steady, and scheduling rates is the most adjustable, and output should meet scheduling accuracy requirement.MPPT(MPPT maximum power point tracking) it is a kind of method that photovoltaic combining inverter is conventional.Photovoltaic combining inverter controls to include outer voltage and current inner loop, and internal ring, with inverter output current as control object, uses dicyclo DQ decoupler shaft to control；Outer shroud provides the given value of current of internal ring by MPPT algorithm.Such as, photovoltaic combining inverter active power dispatch controls to use cell plate voltage control program, thus realize the output utilizing the PV characteristic of cell panel indirectly to control cell panel, but the control accuracy of voltage control method is restricted by MPPT tracing step, need to weigh between response speed and control accuracy, additionally, change due to environmental condition, cell panel PV curve not immobilizes, and scheduling will be caused may to be unable to reach stable state, cause the fluctuation of output.
Summary of the invention
It is an object of the invention to provide a kind of photovoltaic combining inverter active power dispatch control method, the power swing problem caused in order to solve environmental condition to suddenly change.
For achieving the above object, the solution of the present invention is:
A kind of photovoltaic combining inverter active power dispatch control method, photovoltaic combining inverter uses the current inner loop of MPPT outer voltage and DQ decoupler shaft to control, comprises the steps:
1) outer voltage output valve Id_PI_out and dispatch value Id_Dispatch are compared,
2) if Id_PI_out < Id_Dispatch, inverter is operated in MPPT pattern, and internal ring d axle command value Id_ref is Id_PI_out, with current maximum power output；
3) if Id_PI_out > Id_Dispatch, inverter is operated in management and running pattern, and internal ring d axle command value Id_ref is Id_Dispatch, exports with schedule power.
A kind of photovoltaic combining inverter active power dispatch control method according to claim 1, when bringing into operation, photovoltaic combining inverter runs on MPPT pattern；Under MPPT pattern, outer voltage output valve Id_PI_out is less than Id_Dispatch, and inverter works in MPPT pattern；If Id_PI_out is more than Id_Dispatch under MPPT pattern, inverter switches to active power dispatch pattern；Under active power dispatch pattern, Id_PI_out is less than Id_Dispatch, and inverter smoothing switches to MPPT pattern.
From MPPT pattern to active power dispatch pattern or from active power dispatch pattern to MPPT pattern, Id_ref is to be changed to Id_Dispatch with the scheduling rates set as slope value from Id_PI_out or be changed to Id_PI_out from Id_Dispatch.
The present invention still is based on existing outer voltage, current inner loop and DQ decoupler shaft control method, merged power ring control simultaneously, combining inverter output is directly controlled, and realize seamless switching between MPPT and dispatch state by the switching of internal ring and DC bus-bar voltage outer shroud, and guarantee seriality and the continuity of active power of output of internal ring D axle instruction during switching, reach to smooth, the purpose of stable switching.
Accompanying drawing explanation
Fig. 1 is grid-connected photovoltaic inverter parallel network circuit and the control structure figure of prior art；
Fig. 2 is photovoltaic inverter grid-connected circuit and the control structure figure of the present invention.
Detailed description of the invention
The present invention will be further described in detail below in conjunction with the accompanying drawings.
The main circuit of photovoltaic combining inverter is as shown in Fig. 1 top half, generally, photovoltaic combining inverter uses outer voltage, the double-closed-loop control of current inner loop, current inner loop uses dicyclo DQ decoupler shaft to control, with its output electric current for internal ring control object, outer shroud uses MPPT to control, and outer shroud is output as the given input of internal ring.Fig. 1 the latter half gives a kind of double-loop control structure, and the MPPT of outer voltage controls to relate to DC bus-bar voltage and output etc., is used for producing reference voltage, is output as current inner loop reference current through pi regulator.Inverter uses three-phase half-bridge topology, reads three-phase current, three-phase power grid voltage, DC voltage, DC current by sampling；Three-phase grid electric current is decoupled by DQ, it is achieved watt current controls with the independence of reactive current；Photovoltaic combining inverter can control the output of cell panel by controlling DC bus-bar voltage, when MPPT runs, under stable state inverter by DC voltage control in maximum power point corresponding voltage, realizing maximum power output, outer voltage output Id_PI_out is as current inner loop command value (circular current d axle command value in i.e.).
It is the control structure of the present invention as shown in Figure 2, it is with prior art difference, add power dispatching, define the photovoltaic combining inverter active power dispatch control method that a kind of fusion " power ring+electric current loop " controls: if outer voltage output valve Id_PI_out is less than dispatch value Id_Dispatch under MPPT pattern, current inner loop desired value Id_ref is equal to Id_PI_out, inverter works in MPPT pattern, with current maximum power output；If Id_PI_out is converted to Id_Dispatch more than Id_Dispatch, Id_ref from Id_PI_out under MPPT pattern, outer voltage is saturated to be exited, and inverter switches to active power dispatch pattern, exports with schedule power.
Specifically, when bringing into operation, photovoltaic combining inverter runs on MPPT pattern, and host computer issues active power dispatch command and scheduling rates by remote regulating instruction；Inverter calculates generation dispatch value Id_Dispatch in real time according to active power dispatch command, and schedule power is not by grid voltage fluctuation influence.If producing corresponding internal ring current-order about inverter according to dispatch value to belong to prior art, no longer it is developed in details at this.
Under MPPT pattern, outer voltage output valve Id_PI_out is less than Id_Dispatch, and current inner loop desired value Id_ref is equal to Id_PI_out, and inverter works in MPPT pattern, with current maximum power output；
If Id_PI_out is changed to Id_Dispatch more than Id_Dispatch, Id_ref from Id_PI_out under MPPT pattern, outer voltage is saturated to be exited, and inverter smoothing switches seamlessly to active power dispatch pattern, exports with schedule power, is not affected by outer shroud.
Under active power dispatch pattern, if irradiance declines or the increase of dispatch command value causes cell panel output to be unsatisfactory for dispatching requirement, i.e. Id_PI_out is less than Id_Dispatch, outer voltage is moved back saturated, current inner loop desired value Id_ref is equal to Id_PI_out, inverter smoothing switches seamlessly to MPPT pattern, with current maximum power output.
When exiting scheduling, it is only necessary to Id_Dispatch is reduced to acquiescence, and the process automatic seamless that inverter is described by epimere switches to MPPT pattern, smooth and exit dispatch state.
In above step, from MPPT pattern to active power dispatch pattern or from active power dispatch pattern to MPPT pattern, Id_ref is to be changed to Id_Dispatch with the scheduling rates set as slope value from Id_PI_out or be changed to Id_PI_out from Id_Dispatch.
Two kinds of situations have been exited in scheduling, the first artificially exits, schedule power is set to default value (inverter nominal peak power output), Id_Dispatch increases, it two is that illumination variation causes cell panel peak power output to be unsatisfactory for scheduling requirement, Id_PI_out reduces, the two principle is consistent, finally it is satisfied by Id_PI_out < Id_Dispatch, during Parameters variation, outer voltage is gradually moved back saturated, as Id_PI_out≤Id_Dispatch, the instruction of internal ring d axle switches to Id_PI_out, it is achieved scheduling method and the seamless switching of MPPT pattern.
Claims (3)
1. a photovoltaic combining inverter active power dispatch control method, photovoltaic combining inverter uses MPPT outer voltage and DQ
The current inner loop of decoupler shaft controls, it is characterised in that the method has merged power ring control, to combining inverter output
Directly control, and realize seamless switching between MPPT and dispatch state by the switching of internal ring and DC bus-bar voltage outer shroud,
Comprise the steps:
1) if under MPPT pattern, outer voltage output valve Id_PI_out and dispatch value Id_Dispatch are compared,
2) if Id_PI_out < Id_Dispatch, inverter is operated in MPPT pattern, internal ring d axle command value Id_ref
For Id_PI_out, with current maximum power output；
3) if Id_PI_out > Id_Dispatch, inverter is operated in management and running pattern, internal ring d axle command value Id_ref
For Id_Dispatch, export with schedule power.
A kind of photovoltaic combining inverter active power dispatch control method the most according to claim 1, it is characterised in that start
During operation, photovoltaic combining inverter runs on MPPT pattern；Outer voltage output valve Id_PI_out under MPPT pattern
Less than Id_Dispatch, inverter works in MPPT pattern；If Id_PI_out is more than Id_Dispatch under MPPT pattern,
Inverter switches to active power dispatch pattern；Under active power dispatch pattern, Id_PI_out is less than Id_Dispatch, and inverter is put down
Sliding cutting shifts to MPPT pattern.
A kind of photovoltaic combining inverter active power dispatch control method the most according to claim 1, it is characterised in that from
MPPT pattern to active power dispatch pattern or from active power dispatch pattern to MPPT pattern, Id_ref be with set scheduling rates
It is changed to Id_Dispatch for slope value from Id_PI_out or is changed to Id_PI_out from Id_Dispatch.
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| CN104638668B (en) * | 2014-06-12 | 2016-08-31 | 华中科技大学 | A kind of photovoltaic power generation grid-connecting control method and system |
| CN104167761B (en) * | 2014-08-15 | 2017-04-19 | 江苏兆伏新能源有限公司 | Photovoltaic inverter power generation system and control method |
| CN105990849A (en) * | 2015-02-09 | 2016-10-05 | 广东易事特电源股份有限公司 | Mode switching control method and device of photovoltaic grid-connected inverter |
| CN104821607B (en) * | 2015-05-15 | 2017-03-15 | 东北大学 | A kind of photovoltaic micro Power balance control method based on three end Collaborative Control |
| CN104953618A (en) * | 2015-06-19 | 2015-09-30 | 珠海许继电气有限公司 | Networking and off-network uniform control method of energy storage inverter |
| CN105490299B (en) * | 2016-01-07 | 2019-03-05 | 许继集团有限公司 | A kind of active power controller method of two-stage type photovoltaic generating system |
| CN106026170B (en) * | 2016-06-28 | 2018-08-10 | 天津科林电气有限公司 | A kind of control method adjusting photovoltaic combining inverter input power according to network voltage |
| CN107196545A (en) * | 2016-09-08 | 2017-09-22 | 湘潭大学 | Photovoltaic grid-connected three-level inverter control Optimization Platform based on Molecule Motion Theory |
| CN107681892B (en) * | 2017-10-20 | 2020-05-22 | 阳光电源股份有限公司 | Direct current converter |
| CN108667072B (en) * | 2018-05-21 | 2020-09-01 | 合肥工业大学 | Photovoltaic grid-connected inverter control method based on active standby |
| CN111267648B (en) * | 2018-12-04 | 2023-05-26 | 西安许继电力电子技术有限公司 | Bidirectional charging and discharging system of electric automobile and control method thereof |
| CN110148968B (en) * | 2019-07-05 | 2021-02-12 | 华北电力大学 | Fault recovery control method for photovoltaic direct-current grid-connected system |
| CN112134312B (en) * | 2020-09-28 | 2023-01-06 | 阳光电源股份有限公司 | Photovoltaic inverter quick response control method and control device |
| CN116594432B (en) * | 2023-07-17 | 2023-10-27 | 南京师范大学 | Sensorless control method and sensorless control equipment for photovoltaic power generation light tracking system |
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| US8693228B2 (en) * | 2009-02-19 | 2014-04-08 | Stefan Matan | Power transfer management for local power sources of a grid-tied load |
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