CN117674063A - Direct-current electric energy router and photovoltaic access direct-current load power supply system - Google Patents
Direct-current electric energy router and photovoltaic access direct-current load power supply system Download PDFInfo
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Abstract
The invention discloses a direct current power router and a photovoltaic access direct current load power supply system, which comprise: at least one group of power units connected in parallel between the electric energy input side and the transformation output side, wherein each group of power units comprises at least two power conversion modules; each power conversion module comprises a high-frequency oscillation isolation module and a voltage regulation conversion module; the high-frequency oscillation isolation module is connected with the electric energy input side and is used for receiving high-voltage direct current generated by the electric energy input side; the output ends of the voltage regulation conversion modules are connected in parallel in a staggered way and then are respectively connected with the positive electrode and the negative electrode of the voltage transformation output side, and are used for outputting rated high-voltage direct current; the high-frequency oscillation isolation modules of all power conversion modules of each group of power units are mutually connected in series, and the voltage regulation conversion modules of all power conversion modules of each group of power units are mutually connected in parallel.
Description
Technical Field
The invention relates to the technical field of electric energy conversion, in particular to a direct-current electric energy router and a photovoltaic access direct-current load power supply system.
Background
The direct current load energy consumption of electrolytic aluminum and the like is large, the power supply side for providing electric energy for the electrolytic aluminum production line in the prior art mostly utilizes photovoltaic power generation to supply energy, and the working voltage of the electrolytic aluminum production line with large power is generally 1100-1600V at the load side, wherein the energy supply mode of the photovoltaic power generation is specifically divided into the following two modes:
(1) DC/AC, AC/DC AC conversion mode: the high voltage (such as 1500V) generated by photovoltaic power generation is changed into 800V alternating current through an inverter, the 800V alternating current is connected into an alternating current power grid through a step-up transformer, and the alternating current power grid supplies power to a direct current load through a step-down rectifying device.
(2) High voltage dc conversion scheme: after energy is collected by adopting a 1500V voltage class in a general large-scale photovoltaic system, the energy is subjected to direct current conversion through a direct current conversion device with a common two-level topological structure, and the energy is connected into a load system, and as the photovoltaic voltage is higher, a 3300V class power electronic switch is needed to be used as a switching device of the conversion device, and the power electronic switch has low speed, high switching loss and high price.
In addition, the problem of high load voltage exists on the load side, so the switching loss of the conversion device with the traditional topological structure on the load side is large and the conversion device is high in price, namely the problem of high energy consumption exists on the photovoltaic power supply side of the traditional electrolytic aluminum production line due to the fact that the electric energy conversion operation is more, and the problem of high loss exists on the load side.
Disclosure of Invention
The invention aims to provide a direct current electric energy router and a photovoltaic access direct current load power supply system, so as to solve the technical problems of high energy consumption caused by more electric energy conversion operations and high load voltage at a load side in the prior art.
In order to solve the technical problems, the invention specifically provides the following technical scheme:
a DC power router includes,
at least one group of power units connected in parallel between the electric energy input side and the transformation output side, wherein each group of power units comprises at least two power conversion modules;
each power conversion module comprises a high-frequency oscillation isolation module and a voltage regulation conversion module;
the high-frequency oscillation isolation module is connected with the electric energy input side and is used for receiving high-voltage direct current generated by the electric energy input side;
the output ends of the voltage regulation conversion modules are connected in parallel in a staggered way and then are respectively connected with the positive electrode and the negative electrode of the voltage transformation output side, and are used for outputting rated high-voltage direct current;
the high-frequency oscillation isolation modules of all power conversion modules of each group of the power units are connected in series, and the voltage regulation conversion modules of all power conversion modules of each group of the power units are connected in parallel.
As a preferable mode of the present invention, the high-frequency oscillation isolation module includes two-level H-bridge units connected to the electric energy input side, each of which forms an anode input port and a cathode input port, and an isolation transformer connected to the two-level H-bridge units for receiving high-voltage direct current generated by the electric energy input side;
the voltage regulation conversion module comprises stacked three-level structures connected with the voltage transformation output side, and each stacked three-level structure forms an anode output port and a cathode output port;
the two-level H bridge unit is connected with the stacked three-level structure through an isolation transformer, and the stacked three-level structure can output rated high-voltage direct current.
As a preferable scheme of the invention, all the two-level H bridge units of the same group of power units are sequentially connected in series through the positive electrode input port and the negative electrode input port, and the positive electrode input port and the negative electrode input port formed after all the two-level H bridge units are connected in series are respectively connected with the positive electrode and the negative electrode of the electric energy input side so as to realize natural voltage equalizing of the electric energy input side.
As a preferable scheme of the invention, a resonant capacitor group is arranged on a connecting line of the isolation transformer and the two-level H-bridge unit.
As a preferable scheme of the invention, when the number of the power units exceeds one, the input ends of two adjacent groups of the power units are connected in parallel, and the positive electrode input port and the negative electrode input port of each group of the power units are connected with the positive electrode and the negative electrode of the electric energy input side in a matching way.
As a preferable scheme of the invention, the positive output ports of the stacked three-level structures of all the power units are connected in parallel, the negative output ports of the stacked three-level structures of all the power units are connected in parallel, and the final positive output ports and the final negative output ports formed by the parallel connection are respectively connected with the positive and negative poles of the voltage transformation output side.
As a preferable scheme of the invention, the positive output ports of the stacked three-level structure of all power conversion modules are connected with a chopper reactor, and the positive output ports connected with the chopper reactor are connected in parallel and then connected with the positive stage of the voltage transformation output side;
the carrier phases after the chopper reactance are connected in parallel are staggered, so that the harmonic waves of the switching frequency of the output current of the whole direct current power router are mutually offset, and the harmonic content of the total output current is reduced.
In order to solve the technical problem, the invention also provides a photovoltaic access direct current load power supply system of the direct current power router, which comprises:
the photovoltaic confluence assembly is used for connecting the output ends of the photovoltaic power generation strings in parallel;
the secondary confluence device is used for connecting the output ends of the photovoltaic confluence assemblies in parallel;
the direct-current electric energy router is connected with the output end of the secondary confluence device;
the voltage transformation output side protection device is connected with the output end of the direct current power router;
the output end of the voltage transformation output side protection device is connected with a direct current load.
As a preferred scheme of the invention, the photovoltaic confluence assembly of the direct-current electric energy router comprises a photovoltaic confluence box formed by connecting a plurality of photovoltaic power generation groups in series and parallel, and the photovoltaic confluence boxes are connected in parallel through secondary confluence to form a secondary confluence device, and the output end of the secondary confluence device forms a photovoltaic positive electrode line and a photovoltaic negative electrode line;
and the photovoltaic positive electrode circuit and the photovoltaic negative electrode circuit are respectively connected with a positive electrode input port and a negative electrode output port formed by the direct current electric energy router in a matching way.
As a preferred embodiment of the present invention, the voltage-variable output-side protection device includes an output filter, an output fuse protector, an output non-return protector, and an output isolation switch connected in series.
Compared with the prior art, the invention has the following beneficial effects:
the direct current electric energy router adopts a mode of connecting a plurality of groups of power units in parallel to realize high-power direct current conversion, and the transformation output side of the direct current electric energy router adopts a mode of connecting the power units in parallel in a staggered way, so that the switching frequency of the whole machine is further improved, and the harmonic content is further reduced.
The photovoltaic access direct current load power supply system can realize 1500V photovoltaic input, electric energy input side unit voltage equalizing, input-output high-efficiency soft switch isolation, voltage whole-course regulation of a voltage transformation output side and voltage output of 0-2000V of the voltage transformation output side, and the voltage and current harmonic content of the voltage transformation output side is lower due to higher switching frequency of the direct current electric energy router, so that the insulated gate bipolar transistor IGBT with 1700V rated voltage can be used in the direct current electric energy router economically and at high speed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.
Fig. 1 is a schematic diagram of a single power unit in a dc power router according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a whole dc power router according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a photovoltaic access dc load power supply system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the present invention provides a direct current power router, comprising: and at least one group of power units connected in parallel between the electric energy input side and the voltage transformation output side, wherein each group of power units comprises at least two power conversion modules, and each power conversion module comprises a high-frequency oscillation isolation module and a voltage regulation conversion module.
The high-frequency oscillation isolation module is connected with the electric energy input side and is used for receiving high-voltage direct current generated by the electric energy input side.
The output ends of the voltage regulation conversion modules are connected in parallel in a staggered way and then are respectively connected with the positive electrode and the negative electrode of the voltage transformation output side, and the voltage regulation conversion modules are used for outputting rated high-voltage direct current.
The high-frequency oscillation isolation modules of all the power conversion modules of each group of power units are connected in series, and the voltage regulation conversion modules of the two power conversion modules are connected in parallel.
Further, the high-frequency oscillation isolation module comprises two-level H-bridge units connected with the electric energy input side and isolation transformers connected with the two-level H-bridge units, each two-level H-bridge unit forms an anode input port and a cathode input port, and the two-level H-bridge units are used for receiving high-voltage direct current generated by the electric energy input side.
The voltage regulation conversion module comprises stacked three-level structures connected with the voltage transformation output side, and each stacked three-level structure forms an anode output port and a cathode output port.
The two-level H bridge unit is connected with the stacked three-level structure through the isolation transformer, the stacked three-level structure can output rated high-voltage direct current, and the resonant capacitor group is arranged on a connecting line of the isolation transformer and the two-level H bridge unit.
Further, the connection mode of all power conversion modules of the same group of power units is as follows:
all the two-level H bridge units of the same group of power units are sequentially connected in series through an anode input port and a cathode input port, and the anode input port and the cathode input port formed after all the two-level H bridge units are connected in series are respectively connected with the anode and the cathode of the electric energy input side so as to realize natural voltage equalizing of the electric energy input side.
The positive output ports of all the stacked three-level structures of the same group of power units are connected in parallel, and the negative output ports of all the stacked three-level structures of the same group of power units are connected in parallel, so that the output ends of the power units are staggered and connected in parallel.
Further, the positive output ports of the stacked three-level structures of all the power conversion modules are connected with a chopping reactance, and the positive output ports connected with the chopping reactance are connected in parallel and then connected with the positive stage of the voltage transformation output side.
The carrier phases after the chopper reactance are connected in parallel are staggered, so that the harmonic waves of the switching frequency of the output current of the whole direct current power router are mutually offset, and the harmonic content of the total output current is reduced.
It should be noted that the two-level H-bridge unit is responsible for oscillating direct current from photovoltaic into high-frequency alternating current, and when in operation, sequentially turns on and off 2 groups of diagonal IGBTs in the H-bridge, namely, when in positive half-wave, the positive IGBTs of the bridge arm 1 and the negative IGBTs of the bridge arm 2 are turned on, and the other two IGBTs are turned off to output positive voltage; and in the negative half wave, the positive IGBT of the bridge arm 1 and the negative IGBT of the bridge arm 2 are turned off, and the other two IGBTs are turned on to output negative voltage.
The isolation transformation connection unit is responsible for electrically isolating input high-frequency alternating current energy, outputting the high-frequency alternating current energy to an output side, providing rated transformation ratio by using turn ratio, and adopting a resonance soft switch topological structure of a capacitor series single-phase high-frequency transformer. Through resonance of the leakage inductance of the transformer and the capacitor, soft switching of the IGBT, namely zero-voltage on and low-current off, is realized, so that switching loss is reduced, and energy conversion efficiency is improved.
The stacked three-level structure is responsible for recovering the isolated and transformed high-frequency alternating current energy into direct current, voltage is doubled by adopting the three-level structure, and output voltage is controlled by chopper regulation.
The stacked three-level structure is structurally divided into a three-level high-frequency rectifying part, a supporting flat wave part and a chopping wave adjusting part, wherein the three-level high-frequency rectifying part is connected with an isolation transformation connecting unit to restore high-frequency alternating current which is isolated and transformed into direct current, and meanwhile, the restored direct current voltage is doubled compared with the voltage of a two-level topology through a three-level topological structure.
The supporting flat wave part adopts a power capacitor to carry out flat wave on voltage and current.
The chopper regulating part adopts a stacked three-level chopper structure, namely, an upper half direct current bus and a lower half direct current bus are respectively provided with a two-level IGBT chopper bridge arm, and are provided with 1 chopper inductor, when PWM occurs, the two-level IGBT chopper bridge arms have the same carrier wave, the reference amplitude values are the same and the opposite signs, the output total voltage is three-level voltage, the equivalent switching frequency is 2 times of the single IGBT switching frequency, thereby realizing higher switching frequency and lower current harmonic wave, and the output voltage can be changed between 0 and full direct current bus voltage by changing the duty ratio of the chopper regulating part.
In this embodiment, the power input side is a photovoltaic power generation side, and since the input end of the dc power router is connected to a photovoltaic string with an open circuit voltage of 1500V, and the dc voltage of the two-level power unit using a 1200V IGBT is 750V at the most, and the dc voltage of the two-level power unit using a 1700V IGBT is 1100V at the most, the dc power router needs at least one group of power units, and the group of power units needs at least 2 power conversion modules connected in series.
If the input ends of the power conversion modules are not connected in series, connection with the 1500V photovoltaic string cannot be achieved, so that the input ends of the two power conversion modules are connected in series and the output ends of the two power conversion modules are connected in parallel to form a basic power unit.
The output ends of the power conversion modules of the single power units are connected in parallel in a staggered manner, so that the overall switching frequency of each power unit is doubled, the harmonic content is further reduced, and the natural voltage equalizing of the input ends of the power units is realized.
It should be noted that, in the power conversion module of the single power unit of this embodiment, the no-load dc voltage of each two-level H-bridge unit is 750V, and is connected in series to the power input side of 1500V. Because the two-level H bridge units adopt the IGBT with rated voltage of 1200V or 1700V, the IGBT has enough voltage margin to bear transient overvoltage in the switching process of the IGBT.
And the turns-to-turns ratio of the isolation transformer is 750V:1000V,750V side are connected with two level H bridge unit, and 1000V side is connected with stacked three level structure, therefore when the DC voltage of two level H bridge unit is 750V, the half busbar DC voltage of stacked three level structure is about 1000V, and full busbar DC voltage is about 2000V. The stacked three-level structure adopts an IGBT with rated voltage of 1700V, so that the stacked three-level structure has enough voltage margin to bear transient overvoltage in the switching process of the IGBT.
The maximum output voltage of the stacked three-level structure is the output side full bus, namely 2000V and the minimum output voltage is 0V, and by controlling the duty ratio of each IGBT, the random change of the output voltage between 0V and 2000V can be realized, so that the 1100V-1600V voltage output can be realized.
Therefore, the direct current energy router of the embodiment can receive 1500V photovoltaic direct current input, can finish voltage equalizing of an input side and random change of voltage of an output side between 0V and 2000V, realizes 0-2000V voltage output, has higher switching frequency of the whole machine and lower voltage-current harmonic content of the output side, and can use an economical and high-speed IGBT with rated voltage 1700V.
Based on the above, in this embodiment, at least one group of power units is provided, and each group of power units includes at least two power conversion modules, and the no-load dc voltage at the input end of each power conversion module is 750V, so that the power input of 1500V can be born, so that the following situations exist in the composition mode of the dc power router in this embodiment:
(1) the power conversion modules are only one, the input ends of the power conversion modules are connected in series, the output ends of the power conversion modules are connected in parallel in a staggered manner, namely, the positive electrode input ports and the negative electrode input ports of the two-level H bridge units are connected in series, the positive electrode output ports of the stacked three-level structure of all the power conversion modules are connected in parallel, and the negative electrode output ports of the stacked three-level structure of all the power conversion modules are connected in parallel, so that the output ends of the whole direct current electric energy router are uniformly output in a staggered and parallel manner, the overall switching frequency of each group of power units is improved, and the final positive electrode output ports and the final negative electrode output ports formed by parallel connection are respectively connected with the positive electrode and the negative electrode of the output ends.
(2) The power units are connected in parallel, the power conversion modules of each power unit are multiple, the input sides of the power units are connected in series, and the output sides of the power units are connected in parallel in a staggered manner.
That is, when the number of power conversion modules of each group of power units exceeds one, the connection mode of the power conversion modules of each group of power units is as shown in fig. 2:
the two-level H bridge units of all the power conversion modules are sequentially connected in series through the positive electrode input port and the negative electrode input port, and the remaining positive electrode input port and the remaining negative electrode input port after the two-level H bridge units are connected in series are respectively connected with the positive electrode and the negative electrode of the electric energy input side so as to realize natural voltage equalizing of the electric energy input side.
The positive output ports of the stacked three-level structures of all the power conversion modules are connected in parallel to form a positive output port, and the negative output ports of the stacked three-level structures of all the power conversion modules are connected in parallel to form a negative output port.
The connection mode for connecting the plurality of power units in parallel is as follows:
and respectively connecting the anode and the cathode of the photovoltaic power with the anode input port and the cathode input port of each power unit to supply power, and then connecting the cathode output ports and the anode output ports of the power units in staggered parallel to form an anode output port and a cathode output port.
The output ends of the plurality of stacked three-level structures are connected in parallel in a staggered manner, so that the overall switching frequency of a single power unit is improved by multiple times, the number of the improved multiple is the same as that of the power units, the harmonic content is further reduced, and the natural voltage equalizing of the plurality of series power units at the electric energy input side is realized.
The direct current power router of the embodiment adopts a mode of parallel connection of a plurality of groups of power units to realize high-power direct current conversion, and the output end of the whole machine adopts a staggered parallel connection mode, so that the switching frequency of the whole machine is further improved, and the harmonic content is further reduced.
In addition, as shown in fig. 3, the invention also provides a photovoltaic access direct current load power supply system, and the application of the direct current power router comprises the following steps:
and the photovoltaic confluence assembly is used for connecting the output ends of the photovoltaic power generation group strings in parallel.
The secondary confluence device is used for connecting the output ends of the photovoltaic confluence assemblies in parallel, wherein the secondary confluence device is responsible for secondary confluence and fusing protection thereof.
And the direct-current electric energy router is connected with the output end of the secondary confluence device and is responsible for electric isolation, input and output overvoltage and overcurrent protection, system electric energy control, photovoltaic side maximum power point tracking control and output side voltage tracking control.
And the output side protection device is responsible for output filtering, output side short circuit non-return protection, output side fusing protection, overhaul isolation and the like.
The output end of the voltage transformation output side protection device is connected with the direct current load, and the voltage transformation output side protection device comprises an output filter, an output fuse protector, an output non-return protector and an output isolating switch which are connected in series.
The photovoltaic confluence assembly comprises a photovoltaic confluence box connected with a plurality of photovoltaic power generation groups in series, the photovoltaic confluence boxes are connected in parallel through secondary confluence to form a secondary confluence device, and the output end of the secondary confluence device forms a photovoltaic positive electrode line and a photovoltaic negative electrode line;
the photovoltaic positive electrode circuit and the photovoltaic negative electrode circuit are respectively connected with a positive electrode input port and a negative electrode output port formed by the direct current energy router in a matching way.
It is to be added that the photovoltaic conflux case is equipped with fusing protector, anti-reflux protector and the group string current detection subassembly of being connected with every photovoltaic power generation group string, and the output of every photovoltaic conflux case is equipped with lightning protection device and output circuit breaker.
The voltage transformation output side protection device comprises an output filter, an output fuse protector, an output backstop protector and an output isolating switch which are connected in series.
The secondary convergence has the advantages of reducing the number and the cost of the photovoltaic string cables, and the cost of the large-section cables with smaller number is obviously lower than that of the small-section cables with larger number under the same current capacity from the economical aspect.
As a typical example, 360 photovoltaic strings are first converged by 15 24-way convergence boxes, and then transmitted through cables, and then secondarily converged.
If only one confluence is used, 360 anodes and cathodes are needed, and 720 photovoltaic cables with the total length of 6mm and the total length of 1500V are 720, and for the photovoltaic cable with the total length of 6mm and the total length of 1500V, the insulation and mechanical protection materials occupy larger cost.
If a secondary confluence mode is used, each photovoltaic group string uses 1 positive electrode and negative electrode, 720 photovoltaic cables with the length of 6mm and 1500V and shorter are used in total, 15 photovoltaic aluminum cables with the length of 185mm and longer are used for outputting after primary confluence, and then secondary confluence is performed. In this embodiment, the larger length of cable is a smaller number of aluminum cables and is less expensive to manufacture.
The system has complete protection capability, and can better realize the control and protection of photovoltaic direct current access to industrial loads such as electrolytic aluminum and the like.
The photovoltaic access direct current load power supply system can realize 1500V photovoltaic input, voltage equalizing of an electric energy input side unit, input-output high-efficiency soft switch isolation, voltage whole-course adjustment of a voltage transformation output side and 0-2000V voltage output of the voltage transformation output side.
The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application, the scope of which is defined by the claims. Various modifications and equivalent arrangements may be made to the present application by those skilled in the art, which modifications and equivalents are also considered to be within the scope of the present application.
Claims (10)
1. A DC power router is characterized by comprising,
at least one group of power units connected in parallel between the electric energy input side and the transformation output side, wherein each group of power units comprises at least two power conversion modules;
each power conversion module comprises a high-frequency oscillation isolation module and a voltage regulation conversion module;
the high-frequency oscillation isolation module is connected with the electric energy input side and is used for receiving high-voltage direct current generated by the electric energy input side;
the output ends of the voltage regulation conversion modules are connected in parallel in a staggered way and then are respectively connected with the positive electrode and the negative electrode of the voltage transformation output side, and are used for outputting rated high-voltage direct current;
the high-frequency oscillation isolation modules of all power conversion modules of each group of the power units are connected in series, and the voltage regulation conversion modules of all power conversion modules of each group of the power units are connected in parallel.
2. A direct current power router as claimed in claim 1, wherein,
the high-frequency oscillation isolation module comprises two-level H-bridge units connected with the electric energy input side and an isolation transformer connected with the two-level H-bridge units, each two-level H-bridge unit forms an anode input port and a cathode input port, and the two-level H-bridge units are used for receiving high-voltage direct current generated by the electric energy input side;
the voltage regulation conversion module comprises stacked three-level structures connected with the voltage transformation output side, and each stacked three-level structure forms an anode output port and a cathode output port;
the two-level H bridge unit is connected with the stacked three-level structure through an isolation transformer, and the stacked three-level structure can output rated high-voltage direct current.
3. A direct current power router as claimed in claim 2, wherein,
all the two-level H bridge units of the same group of power units are sequentially connected in series through an anode input port and a cathode input port, and the anode input port and the cathode input port formed after all the two-level H bridge units are connected in series are respectively connected with the anode and the cathode of the electric energy input side so as to realize natural voltage equalizing of the electric energy input side.
4. A direct current power router as claimed in claim 2, wherein,
and a resonant capacitor group is arranged on a connecting line of the isolation transformer and the two-level H bridge unit.
5. A direct current power router as claimed in claim 2, wherein,
when the number of the power units exceeds one, the input ends of two adjacent groups of power units are connected in parallel, and the positive electrode input port and the negative electrode input port of each group of power units are connected with the positive electrode and the negative electrode of the electric energy input side in a matching way.
6. A direct current power router as claimed in claim 5, wherein,
the positive output ports of the stacked three-level structures of all the power units are connected in parallel, the negative output ports of the stacked three-level structures of all the power units are connected in parallel, and the final positive output ports and the final negative output ports formed by the parallel connection are respectively connected with the positive and negative poles of the voltage transformation output side.
7. A direct current power router as claimed in claim 6, wherein,
the positive output ports of the stacked three-level structures of all the power conversion modules are connected with a chopping reactance, and the positive output ports connected with the chopping reactance are connected in parallel and then connected with a positive stage of the voltage transformation output side;
the carrier phases after the chopper reactance are connected in parallel are staggered, so that the harmonic waves of the switching frequency of the output current of the whole direct current power router are mutually offset, and the harmonic content of the total output current is reduced.
8. A photovoltaic-access dc load power supply system employing the dc power router of any one of claims 1-7, comprising:
the photovoltaic confluence assembly is used for connecting the output ends of the photovoltaic power generation strings in parallel;
the secondary confluence device is used for connecting the output ends of the photovoltaic confluence assemblies in parallel;
the direct-current electric energy router is connected with the output end of the secondary confluence device;
the voltage transformation output side protection device is connected with the output end of the direct current power router;
the output end of the voltage transformation output side protection device is connected with a direct current load.
9. The photovoltaic-access direct current load power supply system of claim 8, wherein,
the photovoltaic confluence assembly comprises a photovoltaic confluence box connected with a plurality of photovoltaic power generation groups in series, the photovoltaic confluence boxes are connected in parallel through secondary confluence to form a secondary confluence device, and the output end of the secondary confluence device forms a photovoltaic positive electrode line and a photovoltaic negative electrode line;
and the photovoltaic positive electrode circuit and the photovoltaic negative electrode circuit are respectively connected with a positive electrode input port and a negative electrode output port formed by the direct current electric energy router in a matching way.
10. The photovoltaic-access direct current load power supply system of claim 8, wherein,
the voltage transformation output side protection device comprises an output filter, an output fusing protector, an output non-return protector and an output isolating switch which are connected in series.
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| CN202410137929.2A CN117674063A (en) | 2024-02-01 | 2024-02-01 | Direct-current electric energy router and photovoltaic access direct-current load power supply system |
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| CN202410137929.2A CN117674063A (en) | 2024-02-01 | 2024-02-01 | Direct-current electric energy router and photovoltaic access direct-current load power supply system |
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| CN202410137929.2A Pending CN117674063A (en) | 2024-02-01 | 2024-02-01 | Direct-current electric energy router and photovoltaic access direct-current load power supply system |
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| CN111342483A (en) * | 2018-12-18 | 2020-06-26 | 汉能移动能源控股集团有限公司 | Solar power generation system |
| CN114710052A (en) * | 2022-04-28 | 2022-07-05 | 西安交通大学 | Electric energy router power module and electric energy router |
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