CN204681103U - A kind of non-linear current control circuit based on photovoltaic parallel in system - Google Patents
A kind of non-linear current control circuit based on photovoltaic parallel in system Download PDFInfo
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- CN204681103U CN204681103U CN201520252646.9U CN201520252646U CN204681103U CN 204681103 U CN204681103 U CN 204681103U CN 201520252646 U CN201520252646 U CN 201520252646U CN 204681103 U CN204681103 U CN 204681103U
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- control module
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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
Abstract
The utility model belongs to photovoltaic generation control technology field, particularly relate to a kind of non-linear current control circuit based on photovoltaic parallel in system, comprise photovoltaic array, combining inverter, filter circuit, MPPT tracking module, PWM circuit, voltage/current sample circuit, PLL control module and current control module, the output of described photovoltaic array is connected with MPPT tracking module and combining inverter input respectively, described combining inverter output is connected with AC distribution net and voltage/current sample circuit by filter circuit, voltage/current sample circuit output is connected with PLL control module and current control module respectively, described MPPT tracking module is connected with current control module, described current control module is by controlling combining inverter after PWM circuit, fast response time of the present utility model, the dynamic characteristic of system can be improved, enter in network electric energy quality to play positive role at raising single-phase photovoltaic grid-connected system.
Description
Technical field
The utility model belongs to this photovoltaic generation control technology field, particularly relates to a kind of non-linear current control circuit based on photovoltaic parallel in system.
Background technology
Because of the intermittence of illumination and the nonlinear function of electrical energy changer, photovoltaic parallel in system embodies very strong nonlinear characteristic, the performance impact of the nonlinear characteristic that may occur to system dynamic change is large, response speed is slow, meanwhile, grid-connected photovoltaic system generating efficiency in running is low, in order to improve the control of the dynamic property of system, the control of dynamic property mainly comprises multiple PI and controls, track with zero error, sliding formwork control and multiple Based Intelligent Control etc., but in the practical application of grid-connected photovoltaic system, be faced with the output characteristic moment change of photo-voltaic power supply, load variations, the various problems such as catastrophic failure, therefore, network electric energy quality is entered in order to what improve single-phase grid-connected photovoltaic power generation system, and in simplified apparatus structure, reduce on deployment cost and consider, the high-performance electric current control that research and development and combining inverter hardware device adapt has very strong research and apply and is worth, the control system set up is controlled according to non-linear current, by gathering the voltage and current signal of photovoltaic array output and grid-connected photovoltaic system input grid side, through non-linear current controlling unit, coordinate with the function such as MPPT maximum power point tracking and phase-locked loop, regulate inverter to realize the stable and high effective operation of grid-connected photovoltaic system.
Utility model content
The purpose of this utility model is the problems referred to above solving prior art, and provide a kind of non-linear current control circuit based on fast response time, the simple photovoltaic parallel in system of structure, to achieve these goals, the technical solution adopted in the utility model is as follows:
A kind of non-linear current control circuit based on photovoltaic parallel in system, it is characterized in that: comprise photovoltaic array, combining inverter, filter circuit, MPPT tracking module, PWM circuit, voltage/current sample circuit, PLL control module and current control module, the output of described photovoltaic array is connected with MPPT tracking module and combining inverter input respectively, described combining inverter output exports AC distribution net and voltage/current sample circuit to by filter circuit, voltage/current sample circuit output is connected with PLL control module and current control module respectively, described MPPT tracking module is connected with current control module, the control electric current that described current control module exports is by controlling combining inverter after PWM circuit.
Preferably, also filter capacitor is parallel with between the output of described photovoltaic array and the input of combining inverter.
Preferably, described filter circuit is RL series circuit.
Preferably secondary, described current control module adopts DSP-TMS320 Series Controller.
Preferably, described voltage/current sample circuit adopts OP2117 device
In sum, the utility model has following beneficial effect:
The utility model eliminates the nonlinear characteristic that may occur, alleviate the dependence to the complete behavioral characteristics of system, response speed is faster, with MPPT tracking module dynamic fit better effects if, thus improve the dynamic characteristic of system, enter in network electric energy quality to play positive role at raising single-phase grid-connected photovoltaic power generation system, in addition, also improve the power stage of MPPT tracking module, simplified apparatus structure, reduction deployment cost have significant advantage.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model example or technical scheme of the prior art, introduce doing accompanying drawing required in embodiment or description of the prior art simply below, obviously, accompanying drawing in the following describes is only examples more of the present utility model, to those skilled in the art, do not paying under creationary prerequisite, other accompanying drawing can also obtained according to these accompanying drawings.
Fig. 1 is the control principle drawing of the novel a kind of non-linear current control circuit based on photovoltaic parallel in system of this reality.
Embodiment
Below in conjunction with the accompanying drawing in the utility model example, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Composition graphs 1 one kinds is based on the non-linear current control circuit of photovoltaic parallel in system, comprise photovoltaic array, combining inverter, filter circuit, MPPT tracking module, PWM circuit, voltage/current sample circuit, PLL control module and current control module, the output of described photovoltaic array is connected with MPPT tracking module and combining inverter input respectively, described combining inverter output exports AC distribution net and voltage/current sample circuit to by filter circuit, described voltage/current sample circuit output is connected with PLL control module (PLL) and current control module respectively, described MPPT tracking module is connected with current control module, the control electric current that described current control module exports is by controlling combining inverter after PWM circuit, described linearity control circuit module adopts DSP-TMS320 Series Controller, in the utility model, multiplier is provided with in described current control module, Linear Control module and Partial feedback linearization control module, the voltage/current signals that described photovoltaic array exports, the multiplier regulating rear input current control module is carried out by MPPT tracking module, controlled by the Linear Control module in current control module and Partial feedback linearization control module again, effective tracing control is carried out with the maximum power point realizing MPPT tracking module.
In the utility model, in order to reduce the electric current of photo-voltaic power supply output, by disturbance, the moment changes, between the output and the input of combining inverter of photovoltaic array, be also parallel with filter capacitor C; In the utility model, in order to reduce the voltage/current fluctuation that combining inverter exports, at the output of described net inverter, the energy storage filter circuit matched is set, its filter circuit adopts RL series circuit to carry out filtering and store electrical energy, prevent the voltage/current fluctuation exported, make the voltage/current of output keep stable.
Described voltage/current sample circuit adopts high accuracy, the OP2117 operational amplifier of low imbalance voltage and current signal condition to PLL control module (PLL) and the suitable input range of current control module, then collection and the detection of voltage/current is carried out, the voltage/current signals gathering combining inverter output was entered PLL control module (PLL) and was carried out Phase Tracking adjustment by voltage/current sample circuit, then the voltage/current signals of adjustment is exported to the multiplier in current control module, then the voltage/current exported with MPPT tracking module carries out multiplying, finally by the PWM circuit between combining inverter switch, combining inverter is controlled.
Below operation principle of the present utility model is set forth further, as shown in Figure 1, the voltage/current signals that photovoltaic array exports, undertaken regulating the Linear Control module in rear input current control module and Partial feedback linearization control module to control by MPPT tracking module, the voltage/current of AC distribution net side output simultaneously, successively by PLL control module (PLL), Linear Control module and Partial feedback linearization control module control, the voltage/current signals that described MPPT tracking module and PLL control module (PLL) export is after adjustment process, regulated by Linear Control module and Partial feedback linearization control module successively and access linear control module and the PWM circuit between Partial feedback linearization control module and combining inverter switch, the cutting-in control that this DC power supply of photovoltaic array is incorporated to AC network is finally realized by controlling combining inverter.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; allly to use within novel spirit and principle at this, any amendment done, equivalent replacement, improvement etc., within the protection range that all should be included in utility model.
Claims (5)
1. the non-linear current control circuit based on photovoltaic parallel in system, it is characterized in that: comprise photovoltaic array, combining inverter, filter circuit, MPPT tracking module, PWM circuit, voltage/current sample circuit, PLL control module and current control module, the output of described photovoltaic array is connected with MPPT tracking module and combining inverter input respectively, described combining inverter output exports AC distribution net and voltage/current sample circuit to by filter circuit, voltage/current sample circuit output is connected with PLL control module and current control module respectively, described MPPT tracking module is connected with current control module, the control electric current that described current control module exports is by controlling combining inverter after PWM circuit.
2. a kind of non-linear current control circuit based on photovoltaic parallel in system according to claim 1, is characterized in that: be also parallel with filter capacitor between the output of described photovoltaic array and the input of combining inverter.
3. a kind of non-linear current control circuit based on photovoltaic parallel in system according to claim 1, is characterized in that: described filter circuit is RL series circuit.
4. a kind of non-linear current control circuit based on photovoltaic parallel in system according to claim 1, is characterized in that: described current control module adopts DSP-TMS320 Series Controller.
5. a kind of non-linear current control circuit based on photovoltaic parallel in system according to claim 1, is characterized in that: described voltage/current sample circuit adopts OP2117 device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520252646.9U CN204681103U (en) | 2015-04-23 | 2015-04-23 | A kind of non-linear current control circuit based on photovoltaic parallel in system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520252646.9U CN204681103U (en) | 2015-04-23 | 2015-04-23 | A kind of non-linear current control circuit based on photovoltaic parallel in system |
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| CN204681103U true CN204681103U (en) | 2015-09-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116979608A (en) * | 2023-08-03 | 2023-10-31 | 南通大学 | Overvoltage power limiting control method and system for photovoltaic grid-connected inverter |
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2015
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116979608A (en) * | 2023-08-03 | 2023-10-31 | 南通大学 | Overvoltage power limiting control method and system for photovoltaic grid-connected inverter |
| CN116979608B (en) * | 2023-08-03 | 2024-03-01 | 南通大学 | Overvoltage power limiting control method and system for photovoltaic grid-connected inverter |
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