CN212695716U - Photovoltaic and mains supply hybrid power supply device capable of being connected in parallel - Google Patents
Photovoltaic and mains supply hybrid power supply device capable of being connected in parallel Download PDFInfo
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- CN212695716U CN212695716U CN202022184782.2U CN202022184782U CN212695716U CN 212695716 U CN212695716 U CN 212695716U CN 202022184782 U CN202022184782 U CN 202022184782U CN 212695716 U CN212695716 U CN 212695716U
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Abstract
The utility model belongs to the technical field of photovoltaic power generation, specifically be a but parallel operation photovoltaic commercial power mixes power supply unit. The utility model discloses the device adopts solar photovoltaic array to generate electricity, through keeping apart direct current 48V and changeing into 311V amplitude 100Hz pulsating wave and 50Hz exchange 220V and changeing into 311V amplitude 100Hz pulsating wave after the buffering of lithium cell group and mix the power supply that converges, converts the 311V amplitude pulsating wave after photovoltaic electric energy and electric wire netting are mixed into 50Hz sine wave through inverter circuit at last; the phase and amplitude of the pulsating wave output by the power grid and the photovoltaic are accurately tracked through the single chip microcomputer, and the single chip microcomputer is used for hybrid scheduling of photovoltaic power generation and the power grid; the utility model discloses mixing efficiency is high, the dispatch is convenient, has solved present grid-connected photovoltaic power generation and can not mix the dispatch scheduling problem from grid-connected photovoltaic power generation, can seamless switch over in pure from net, pure electric net, solar energy and electric wire netting electric energy hybrid power supply mode simultaneously to configure into single phase alternating current parallel operation and three-phase alternating current parallel operation mode or work in the unit mode according to actual demand.
Description
Technical Field
The utility model belongs to the technical field of photovoltaic power generation, concretely relates to but parallel operation photovoltaic commercial power mixes power supply unit.
Background
Photovoltaic power generation is currently in large-scale commercial use and has produced good economic benefits. However, the current mainstream of the photovoltaic power generation technology adopts grid-connected power generation, that is, the electricity generated by photovoltaic power is merged into a power grid. There are several disadvantages:
1. the method is troublesome when the method is incorporated into a power grid and requires application of an approval procedure, and even grid connection is not allowed in some areas due to transformer load problems;
2. the power grid dispatching capacity is limited, so that large-scale photovoltaic power generation is inconvenient to be merged into the power grid;
3. three-phase imbalance is easily caused by overlarge grid-connected power existing in household single-phase grid-connected inversion, and single-phase grid-connected power generation is restricted;
4. the device is inconvenient to use when the power supply is off the power supply of an island or the power grid fails and has power failure.
Another photovoltaic power supply framework is also available in the market, a switching off-grid photovoltaic inverter with an energy storage battery is adopted, during normal use, photovoltaic power charges the battery, meanwhile, photovoltaic inversion is used for generating alternating current electric energy, and when the battery or photovoltaic energy is insufficient, the battery or photovoltaic energy is switched to a power grid for power supply. The following disadvantages also exist:
1. the single machine power is generally small and cannot meet the requirement of high-power use of more than 6 kVA;
2. solar energy and power grid energy cannot be used simultaneously, if the electric load is too heavy, all loads are switched to the power grid for power supply, so that the solar energy is wasted in an idle mode, and the energy-saving benefit of the solar energy cannot be exerted to the maximum extent;
3. if the switching time is too long in the process of load switching, the household equipment is easily powered off and shut down;
4. due to the fact that the off-grid inverter is used, power is supplied by the battery pack completely during inversion power supply, rated currents and capacities of the battery pack and the inverter which need to be equipped are large, the size is heavy, and the price is high.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a can parallel operation photovoltaic commercial power hybrid power supply device to overcome the above-mentioned not enough.
The utility model provides a parallel operation photovoltaic commercial power hybrid power supply device, the structure of which is shown in figure 1; the method comprises the following steps: the solar photovoltaic power generation system comprises a solar photovoltaic power generation assembly array 1, a photovoltaic charging and discharging BMS integrated controller 2, a 48V lithium battery pack 3, an isolation direct current-to-pulse wave circuit 4, a pulse wave-to-sine wave inverter circuit 5, a backflow-preventing power grid sine wave-to-pulse wave circuit 6, a single-chip microcomputer control scheduling circuit 7, an AC220V AC power grid input end 8, an RS485 communication interface 9 and an AC220V AC output load end 12; wherein:
the solar photovoltaic power generation assembly array 1 is connected to a photovoltaic charging and discharging BMS integrated controller 2, unstable photovoltaic energy is buffered into stable direct current by taking a 48V lithium battery pack 3 as an energy buffer area, the stable direct current is input into an isolated direct current to pulsating wave circuit 4, the direct current is converted into isolated pulsating wave, and the isolated pulsating wave to sinusoidal wave inverter circuit 5 is connected; meanwhile, the other AC220V AC power grid input end 8 is connected to the backflow-preventing power grid sine wave-to-pulsating wave circuit 6, the power grid sine wave of the AC220V AC power grid input end 8 is converted into pulsating wave, the pulsating wave-to-sinusoidal wave-to-phase circuit 5 is input, and finally the solar electric energy and the power grid electric energy are dispatched and output to the AC220V AC output load end 12 through the single chip microcomputer control dispatching circuit 7 according to actual requirements, so that hybrid dispatching and supply of the solar energy of the solar photovoltaic power generation assembly array 1 and the power grid energy of the 220V power grid input end 8 are achieved.
The solar photovoltaic power generation assembly array 1 is used for converting solar energy into electric energy; the photovoltaic array specifically comprises a plurality of standard 370W high-efficiency monocrystalline silicon or polycrystalline silicon photovoltaic modules, and a large photovoltaic array is formed by combining a plurality of strings and a plurality of columns (namely a plurality of rows and a plurality of columns). The number and the power of the photovoltaic modules are determined according to actual use requirements; for example, the photovoltaic modules are 12 standard 370W modules and can be combined into 2 strings and 6 parallel modules; the maximum power point working voltage is 60V, and the maximum output power is 4.4 KW. For another example, the photovoltaic module is 8 standard 370W, and can form 2 strings and 4 parallel, and the output power is about 2.96 KW.
The 48V lithium battery pack 3 is used for buffering the energy instability of solar energy caused by illumination fluctuation; the 48V lithium battery pack is generally formed by connecting 14 strings of 3.6V or 16 strings of 3.2V lithium batteries in series and parallel. A single-string voltage and temperature detection circuit is integrated on the lithium battery pack and used for detecting the temperature and the voltage of the single-string lithium battery and transmitting temperature and voltage data through wireless communication.
Photovoltaic charge and discharge BMS integral type controller 2 is the photovoltaic charge and discharge protection controller of integrated single cluster lithium cell wireless voltage and temperature sampling for voltage and the temperature of single cluster battery are detected by single cluster voltage temperature detection circuit in the wireless collection lithium cell group, and control 48V lithium cell group 3 overcharge, overdischarge, overflow and the temperature protection. Because the 48V lithium battery pack 3 is arranged in the system, the single-string overcharge and overdischarge protection and the high and low temperature protection of the lithium battery are required, so that the safety accident problem caused by the abnormal work of the battery is avoided.
Further:
the isolation direct current-to-pulsating wave circuit 4 is used for isolating high-voltage electricity from low-voltage electricity, and the single chip microcomputer control scheduling circuit 7 converts 48V direct current into unipolar pulsating wave electric energy with the amplitude of 311V 100Hz through a high-frequency switch and a transformer. The isolated direct current to pulsating wave circuit 4 specifically adopts a two-phase interleaved isolated flyback converter composed of a gallium nitride switching device and a silicon carbide rectifying device, and converts 48V direct current into 100Hz unipolar pulsating wave through a high-frequency switch and a transformer by a single-chip software algorithm.
The pulse wave to sine wave inverter circuit 5 is used for unipolar pulse wave inversion, namely 100Hz unipolar pulse waves obtained by the isolation direct current to pulse wave circuit 4 are converted into 50Hz sine waves through the inverter circuit; the inverter circuit is an H-bridge formed by 4 MOS tubes, and 100Hz pulse electric waves are inverted into 50Hz sine waves by controlling the switching time sequence of the H-bridge.
The backflow-preventing power grid sine wave-to-pulse wave circuit 6 is used for converting a 50Hz sine wave of an alternating current power grid at an input end 8 of an AC220V alternating current power grid into a 100Hz unipolar pulse wave, converging the 100Hz unipolar pulse wave on a pulse wave bus, and meanwhile, preventing voltage on the pulse wave bus from flowing backward to the power grid. The backflow-preventing power grid sine wave-to-pulse wave circuit 6 is specifically a 6 600V/30A high-current rectifier bridge stack which rectifies 50Hz sine waves into 100Hz pulse waves. Meanwhile, the rectifier bridge stack has unidirectional conductivity, and can prevent pulsating electric waves generated by solar inversion from flowing backward into a power grid, so that unidirectional energy transmission is realized.
The single chip microcomputer control scheduling circuit 7 coordinates and controls the energy scheduling of the isolated direct current to direct current pulsating wave circuit 4, the pulsating wave to sine wave inverter circuit 5 and the backflow prevention power grid sine wave to pulsating wave circuit 6 through the single chip microcomputer and internal operation software (which is a conventional technology), and controls the working parameters 9 of the RS485 communication interface output circuit at the same time. The single chip microcomputer is internally provided with an intelligent software algorithm, parameters such as the working frequency phase amplitude and the like of the power grid voltage can be automatically tracked according to the power load, so that the output pulsating wave of the solar inverter circuit and the pulsating wave generated by the power grid are controlled to be in the same frequency and phase, and the solar energy and the power grid energy are dispatched by adjusting the amplitude of the output pulsating wave of the solar inverter.
The AC220V alternating current power grid input end 8 is used for being connected to a 220V alternating current power grid end when the device works in hybrid power supply of photovoltaic and power grids; the device may be left unused when operating in an off-grid mode.
The RS485 communication interface 9 is used for outputting circuit working data; when multiple machines work, the multiple systems can be scheduled and used in parallel and expanded; when the single machine works, the machine can be idle and not used.
The AC220V AC outputs the load port 12 for connection to the load side to which all AC loads may be connected in parallel.
In the present invention, the pulsating wave 10 is a 100Hz pulsating wave waveform, the amplitude voltage 220V 1.414=311V, and all the related pulsating waves are described based on the waveform as a reference.
In the present invention, the sine wave 11 is a 50Hz ac sine wave, and all the 50Hz ac sine waves mentioned herein are described by reference based on this waveform.
The utility model discloses the device has solved following several kinds of problems:
(1) a backflow-preventing circuit 6 for converting sine waves into pulsating waves of a power grid is innovatively added; the whole system can not send energy into the power grid, so that the product is equivalent to off-grid application, a grid connection procedure is not required to be applied, and the problem of grid connection difficulty caused by limited power grid dispatching capability is solved;
(2) an isolation direct current to direct current pulsating wave circuit 4 is innovatively added, the conversion amplitude of 48V direct current to 311V 100Hz pulsating wave is tracked, and the hybrid use and scheduling of solar energy and power grid energy are realized by tracking the phase angle and amplitude of the bus pulsating wave; the solar energy and the power grid energy are used simultaneously, and the problem that the off-grid switching inversion power supply cannot be used for hybrid power supply is solved;
(3) the 48V lithium battery pack 3 is added in the device, so that the stability and reliability of solar power supply energy can be still ensured when solar illumination fluctuates, and meanwhile, because the battery pack is only used as energy source buffer in the system, a smaller lithium battery pack can be selected, the weight and the volume are reduced, and the cost is reduced;
(4) a single chip microcomputer control scheduling circuit 7 and an RS485 communication interface 9 are added to realize the parallel operation of multiple sets of systems, the power range can be expanded to be large, for example, the single-machine working power is 4.5kVA (refer to the device structure principle diagram of fig. 1), 1-3 parallel operations can be 13.5kVA single-phase 220V output (refer to the single-phase multiple-machine parallel structure principle diagram of fig. 2), and 3 or 6 parallel operations can be 13.5-27kVA three-phase 380V output (refer to the three-phase 380V output multiple-machine parallel structure principle diagram of fig. 3);
(5) the 48V battery pack 3 is added, so that the problem that the power load can still work normally without dead zones after the power grid is powered off is solved, and the shutdown of some equipment sensitive to power failure or the loss of the equipment due to the fact that the data of the equipment is not stored in time can be avoided;
(6) when the sun is absent and the electric load is not large at night, the 48V battery pack 3 can still be used as basic illumination and light-load energy supply, so that the power grid energy is used to the minimum extent;
(7) when the power load is smaller than the power of the solar photovoltaic power generation assembly array 1, the redundant part of electric quantity can be stored in the 48V lithium battery pack 3 and can be used for supplying electric energy to the power load when solar power generation is not available at night, so that the idle waste of solar photovoltaic power generation when the household load is small is avoided.
Advantageous effects
The utility model relates to a solar energy power generation technology's of clean energy cooperation device can effectively alleviate the human dependence to power generation technologies such as thermal power, adds the lithium cell group and can export the clean energy as the maximum stability of buffering technique. When the solar illumination energy is seriously insufficient, the power grid is used as stable mixed supplement, and the difficulty that the current grid-connected power generation application grid-connected condition is limited is solved. The energy-saving and environment-friendly energy-saving energy-. Meanwhile, when a large-scale natural disaster occurs, the power grid has large-scale power failure or paralysis, the device can still work in a pure solar off-grid power supply mode, and the emergency power supply of household appliances during power failure of the power grid is met. Has important practical value and economic significance.
Drawings
Fig. 1 is a schematic diagram (single machine) of the structure of the device of the present invention.
Fig. 2 is a schematic diagram of the single-phase output multi-machine parallel structure of the device of the present invention.
Fig. 3 is a schematic diagram of the device of the present invention with three-phase 380V output multi-machine parallel connection.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments.
Example 1, shown with reference to figure 1. Single hybrid photovoltaic and mains power supply device capable of being connected in parallel comprises: the solar photovoltaic power generation system comprises a solar photovoltaic power generation assembly array 1, a photovoltaic charging and discharging BMS integrated controller 2, a 48V lithium battery pack 3, an isolation direct current-to-pulse wave circuit 4, a pulse wave-to-sine wave inverter circuit 5, a backflow-preventing power grid sine wave-to-pulse wave circuit 6, a single-chip microcomputer control scheduling circuit 7, an AC220V AC power grid input end 8, an RS485 communication interface 9 and an AC220V AC output load end 12;
the photovoltaic module array 1 is composed of 12 standard 370W high-efficiency monocrystalline silicon or polycrystalline silicon photovoltaic modules, and 2 strings and 6 parallel pairs are formed; the maximum power point working voltage is 60V, and the maximum output power is 4.4 KW.
The 48V lithium battery pack 3 is formed by connecting 14 strings of 3.6V or 16 strings of 3.2V lithium batteries in series and parallel. A single-string voltage and temperature detection circuit is integrated on the lithium battery pack and used for detecting the temperature and the voltage of the single-string lithium battery and transmitting temperature and voltage data through wireless communication.
Photovoltaic charge and discharge BMS integral type controller 2 is the photovoltaic charge and discharge protection controller of integrated single cluster lithium cell wireless voltage and temperature sampling for voltage and the temperature of single cluster battery are detected by single cluster voltage temperature detection circuit in the wireless collection lithium cell group, and control the overcharge of 48V lithium cell group 3, overdischarge, overflow and temperature protection.
The isolation direct current-to-pulsating wave circuit 4 is used for isolating high-voltage and low-voltage electricity, and the single chip microcomputer control scheduling circuit 7 converts 48V direct current into unipolar pulsating wave electric energy with the amplitude of 311V 100Hz through a high-frequency switch and a transformer. Specifically, a two-phase interleaved isolation flyback converter composed of a gallium nitride switching device and a silicon carbide rectifying device is adopted, and a software algorithm of a single chip microcomputer is adopted to convert 48V direct current into 100Hz unipolar pulsating waves through a high-frequency switch and a transformer.
The pulse wave to sine wave inverter circuit 5 is used for unipolar pulse wave inversion, namely 100Hz unipolar pulse waves obtained by the isolation direct current to pulse wave circuit 4 are converted into 50Hz sine waves through the inverter circuit; the inverter circuit is an H-bridge formed by 4 MOS tubes, and 100Hz pulse electric waves are inverted into 50Hz sine waves by controlling the switching time sequence of the H-bridge.
The backflow-preventing power grid sine wave-to-pulse wave circuit 6 is used for converting a 50Hz sine wave of an alternating current power grid at an input end 8 of an AC220V alternating current power grid into a 100Hz unipolar pulse wave, converging the 100Hz unipolar pulse wave to a pulse wave bus, and meanwhile, preventing voltage on the pulse wave bus from flowing backward to the power grid. The backflow-preventing power grid sine wave-to-pulse wave circuit 6 is specifically a 6 600V/30A high-current rectifier bridge stack which rectifies 50Hz sine waves into 100Hz pulse waves. Meanwhile, the rectifier bridge stack has unidirectional conductivity, and can prevent pulsating electric waves generated by solar inversion from flowing backward into a power grid, so that unidirectional energy transmission is realized.
The single chip microcomputer control scheduling circuit 7 coordinates and controls the energy scheduling of the isolated direct current to direct current pulsating wave circuit 4, the pulsating wave to sine wave inverter circuit 5 and the backflow prevention power grid sine wave to pulsating wave circuit 6 through the single chip microcomputer and internal operation software, and controls the working parameters 9 of the RS485 communication interface output circuit at the same time. The single chip microcomputer is internally provided with an intelligent software algorithm, parameters such as the working frequency phase amplitude and the like of the power grid voltage can be automatically tracked according to the power load, so that the output pulsating wave of the solar inverter circuit and the pulsating wave generated by the power grid are controlled to be in the same frequency and phase, and the solar energy and the power grid energy are dispatched by adjusting the amplitude of the output pulsating wave of the solar inverter.
The basic principle of the built-in intelligent software algorithm of the single chip microcomputer is that when the single chip microcomputer detects that the electric load of an AC220V AC output load end 12 is light, the single chip microcomputer software controls the output voltage of an isolation direct current to pulse wave circuit 4 to be slightly higher than the output voltage of a backflow prevention power grid sine wave to pulse wave circuit 6, so that the current of an AC220V AC power grid input end 8 is automatically reduced, and according to the kirchhoff current law principle, when the electric current of the AC220V AC output load end 12 is constant, the output current of the isolation direct current to pulse wave circuit 4 is automatically increased; when the power load of the AC220V AC output load end 12 is continuously increased to be larger than the power of the solar photovoltaic power generation assembly array 1, the output current of the isolated DC-to-pulse wave circuit 4 is not continuously increased; similarly, the current at the input 8 of the AC network will automatically increase according to kirchhoff's current law AC 220V. Therefore, the dispatching of solar energy and power grid energy is realized.
The single chip microcomputer software detects the voltage value of an alternating current power grid, a software counter starts counting when the voltage zero crossing is detected, a count value is stored until the next voltage zero crossing is detected, the software counting time is 2 times of the alternating current period, meanwhile, 8 groups of voltage data are sampled every 10uS, the voltage data are averaged and stored, the maximum value is obtained by comparing the average value of the sampled voltage with the average value of the sampled voltage at the last time, the finally compared maximum value is the maximum amplitude of the power grid voltage, and the working frequency phase amplitude of the power grid voltage can be detected according to the principle.
Example 2, shown with reference to figure 2. Namely, the device can be used by a plurality of sets of devices in parallel. The RS485 communication interfaces 9 of each set of device are connected together, and the AC220V AC output load end 12 of each set of device is connected in parallel to realize multi-machine parallel operation, thereby expanding the output use of higher power single-phase AC 220V/13.5 KVA electric energy. When the parallel operation is carried out, the RS485 communication interfaces 9 of all the devices are required to be connected on a bus in parallel, and the power distribution and the voltage and current phase configuration of the multi-parallel operation are coordinated through the RS485 communication interfaces.
Example 3, shown with reference to figure 3. Namely 3 sets or 6 sets of devices are connected into a three-phase AC380V/13.5-27kVA power output for use, RS485 communication interfaces 9 of all the devices are required to be connected on a bus in parallel when the devices are connected, and power distribution and voltage and current phase configuration of multi-machine parallel operation are coordinated through the RS485 communication interfaces. And the system can work normally only with a single machine in an application scene without parallel operation.
This device is in not having the 220V electric wire netting area, can work alone in the mode of leaving the net, only use solar energy power supply of solar photovoltaic power generation subassembly array 1, through solar photovoltaic power generation subassembly array 1, photovoltaic charge and discharge BMS integral type controller 2, 48V lithium cell group 3, keep apart direct current circulation ripple circuit 4, ripple wave changes sinusoidal wave inverter circuit 5, AC220V AC output load port 12, these several parts work alone in pure photovoltaic power supply mode of leaving the net, can realize not having electric wire netting energy area to realize solar energy power supply of leaving the net, AC220V AC electric wire netting input 8 can be vacant not use during the power supply of leaving the net.
The device can be used for an off-grid and pure-grid seamless switching supply mode, the mixed scheduling use of the power grid electric energy of an AC220V alternating current power grid input end 8 and the solar electric energy of the photovoltaic module array 1 is realized in a power grid-to-home area, the solar clean energy is preferentially used when the power load does not exceed the output power of the solar photovoltaic module array 1, and the electric charge expenditure is saved. When the power load is larger than the solar power, the solar photovoltaic clean energy is still preferentially consumed, and the part with insufficient power is controlled by the single chip microcomputer control dispatching circuit 7 to automatically dispatch the energy of the part with insufficient power from the AC220V AC power grid input end 8; when the power load is smaller than the solar power generation power, the surplus part of electric quantity can be stored in the 48V lithium battery pack 3, and the solar photovoltaic power generation system can be used for working in a pure off-grid mode when no solar power generation is carried out at night, and the electric energy supply of the power load is realized without depending on a power grid, so that the idle waste of solar photovoltaic power generation when the household load is small in the daytime is avoided; when the pure off-grid mode battery energy consumption is nearly insufficient, the single chip microcomputer control dispatching circuit 7 controls the dispatching circuit to automatically switch the load to the pure grid mode, and reliable electric energy supply is guaranteed.
Claims (5)
1. The utility model provides a but parallel operation photovoltaic commercial power hybrid power supply device which characterized in that includes: the solar photovoltaic power generation system comprises a solar photovoltaic power generation assembly array (1), a photovoltaic charging and discharging BMS integrated controller (2), a 48V lithium battery pack (3), an isolation direct current to Direct Current (DC) pulse wave isolating circuit (4), a pulse wave to sinusoidal wave phase inversion circuit (5), a backflow prevention power grid sinusoidal wave to pulse wave inverting circuit (6), a single chip microcomputer control scheduling circuit (7), an AC220V AC power grid input end (8), an RS485 communication interface (9) and an AC220V AC output load end (12); wherein:
the solar photovoltaic power generation assembly array (1) is connected to a photovoltaic charging and discharging BMS integrated controller (2), unstable photovoltaic energy is buffered into stable direct current by taking a 48V lithium battery pack (3) as an energy buffer area, the stable direct current is input into an isolated direct current to direct current pulsating wave circuit (4), the direct current is converted into isolated pulsating wave, and the isolated pulsating wave to direct sine wave inverter circuit (5) is connected; meanwhile, the other AC220V AC power grid input end (8) is connected to a backflow-preventing power grid sine wave-to-pulse wave circuit (6), a power grid sine wave of the AC220V AC power grid input end (8) is converted into a pulse wave and input to a pulse wave-to-sine wave phase inversion circuit (5), and finally solar electric energy and power grid electric energy are dispatched and output to an AC220V AC output load end (12) through a single chip microcomputer control dispatching circuit (7) according to actual requirements, so that hybrid dispatching and supply of solar energy of the solar photovoltaic power generation assembly array (1) and power grid energy of the AC220V AC power grid input end (8) are realized;
the solar photovoltaic power generation assembly array (1) consists of a plurality of 370W high-efficiency monocrystalline silicon or polycrystalline silicon photovoltaic assemblies, and a large photovoltaic array is formed by combining a plurality of strings and a plurality of parallel lines, namely a plurality of rows and a plurality of columns;
the 48V lithium battery pack (3) is formed by connecting 14 strings of 3.6V or 16 strings of 3.2V lithium batteries in series and parallel; a voltage and temperature detection circuit for detecting the temperature and the voltage of a single-string lithium battery is integrated on the lithium battery pack, and temperature and voltage data are transmitted through wireless communication;
the photovoltaic charge-discharge BMS integrated controller (2) is a photovoltaic charge-discharge protection controller integrating single-string lithium battery wireless voltage and temperature sampling, is used for wirelessly collecting the voltage and the temperature of a single-string battery detected by a single-string voltage and temperature detection circuit in a lithium battery pack, and controls overcharge, overdischarge, overcurrent and temperature protection of a 48V lithium battery pack (3).
2. The parallel-operation photovoltaic commercial power hybrid power supply device according to claim 1, characterized in that the isolated DC-to-pulsed wave circuit (4) is used for isolating high-voltage and low-voltage electric, and the single chip microcomputer controls the scheduling circuit (7) to convert 48V DC into unipolar pulsed wave electric energy with the amplitude of 311V 100Hz through a high-frequency switch and a transformer; specifically, a two-phase interleaved isolation flyback converter composed of a gallium nitride switching device and a silicon carbide rectifying device is adopted, and a software algorithm of a single chip microcomputer is adopted to convert 48V direct current into 100Hz unipolar pulsating waves through a high-frequency switch and a transformer.
3. The parallel-operation photovoltaic commercial power hybrid power supply device according to claim 2, wherein the pulsating wave-to-sinusoidal wave inverter circuit (5) is used for unipolar pulsating wave phase inversion, namely, 100Hz unipolar pulsating waves obtained by the isolated DC-to-pulsating wave circuit (4) are converted into 50Hz sinusoidal waves through the inverter circuit; the inverter circuit is an H-bridge formed by 4 MOS tubes, and 100Hz pulse electric waves are inverted into 50Hz sine waves by controlling the switching time sequence of the H-bridge.
4. The parallel operation photovoltaic commercial power hybrid power supply device according to claim 3, wherein the backflow-preventing power grid sine wave-to-commercial power conversion ripple circuit (6) is used for converting an alternating power grid 50Hz sine wave of an AC220V alternating power grid input end (8) into a 100Hz unipolar ripple wave, and converging the 100Hz unipolar ripple wave on a ripple wave bus, and simultaneously preventing the voltage on the ripple wave bus from flowing backwards to the power grid; the backflow-preventing power grid sine wave-to-pulse wave circuit (6) is specifically 6 600V/30A high-current rectifier bridge stacks, and rectifies 50Hz sine waves into 100Hz pulse waves; meanwhile, the rectifier bridge stack has unidirectional conductivity, and can prevent pulsating electric waves generated by solar inversion from flowing backward into a power grid, so that unidirectional energy transmission is realized.
5. The parallel-operation photovoltaic commercial power hybrid power supply device according to claim 4, characterized in that the parallel-operation photovoltaic commercial power hybrid power supply device is composed of a plurality of sets of single photovoltaic commercial power hybrid power supply devices, specifically, the RS485 communication interface (9) of each set of devices is connected together, and the AC220V AC output load end (12) of each set of devices is connected in parallel, so as to expand the use of higher power single-phase AC 220V/13.5 KVA power output; and when the parallel operation is carried out, the RS485 communication interfaces (9) of all the single devices are connected on the same bus in parallel, and the power distribution and the voltage and current phase configuration of the multi-machine parallel operation are coordinated through the RS485 communication interfaces (9).
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| CN202022184782.2U CN212695716U (en) | 2020-09-29 | 2020-09-29 | Photovoltaic and mains supply hybrid power supply device capable of being connected in parallel |
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