CN116599192B - A photovoltaic off-grid, city grid and energy storage hybrid power supply system - Google Patents

Abstract

The invention discloses a photovoltaic off-grid, city grid and energy storage hybrid power supply system, which relates to the field of power supply. The photovoltaic off-grid, city grid and energy storage hybrid power supply system includes: a photovoltaic power supply module for converting solar energy into Electric energy is output to the first voltage detection module; compared with the prior art, the beneficial effect of the present invention is: by setting the charge and discharge control module, the present invention will change the charging rate of the battery storage module according to the output voltage of the photovoltaic power supply module. ; Use MOS tube as the switch of the charge and discharge control module to avoid damage caused by frequent opening and closing; use MOS tube as the switch, when the switch is closed and opened, the voltage flowing through the MOS tube will be smaller, which will reduce the voltage when the switch is closed and opened. Generate a large current; set up the voltage output module to ensure stable output voltage while building a power supply delay to ensure stable voltage during the power supply switching process of the photovoltaic power supply module, battery storage module, and mains power module.

Description

A photovoltaic off-grid, city grid and energy storage hybrid power supply system

Technical field

The invention relates to the field of power supply, specifically a photovoltaic off-grid, city grid and energy storage hybrid power supply system.

Background technique

Photovoltaic off-grid power supply includes grid-connected power supply and off-grid power supply. Grid-connected power supply: The electric energy generated by the photovoltaic power supply source is integrated with the city grid to power the load through the grid-connected inverter; Off-grid power supply: The electric energy generated by the photovoltaic power supply source is combined with the city grid. The city network isolates and supplies power to the load independently.

In the process of photovoltaic power supply, there is often excessive photovoltaic power supply. At this time, part of the electric energy is often stored through energy storage batteries, so that when the photovoltaic power supply is insufficient, the energy storage batteries can supply power to the load and make full use of light energy.

In the existing photovoltaic power supply process, the energy storage battery is often charged through a switch, that is, it is not charged after the switch is turned off, and is fully charged after the switch is closed. When the output voltage of the photovoltaic power supply fluctuates around the demand voltage of the start switch, the switch It will close and disconnect frequently, which can easily cause damage to the switch and needs to be improved.

Contents of the invention

The purpose of the present invention is to provide a photovoltaic off-grid, city grid and energy storage hybrid power supply system to solve the problems raised in the above background technology.

In order to achieve the above objects, the present invention provides the following technical solutions:

A photovoltaic off-grid, city grid and energy storage hybrid power supply system, including:

A photovoltaic power supply module is used to convert solar energy into electrical energy and output it to the first voltage detection module;

The first voltage detection module is used to detect the size of the input voltage, control whether the charge and discharge control module is conductive and the degree of conduction according to the size of the input voltage; and provide power to the voltage output module;

The charge and discharge control module is used to set two conductive lines. One conductive line outputs the voltage of the first voltage detection module to the bidirectional DC conversion module, and the other conductive line outputs the voltage of the bidirectional DC conversion module to the first voltage. detection module;

A bidirectional DC conversion module is used to convert the voltage output by the first voltage detection module into DC to charge the battery storage module; or convert the voltage output from the battery storage module into DC to supply power to the voltage output module;

Battery storage module, used to store or output electrical energy;

The voltage output module is used to provide stable direct current for the DC to AC module; to stabilize the voltage during the power supply switching process of the photovoltaic power supply module, battery storage module, and mains power supply module;

DC to AC module is used to convert DC power into AC power and output it to the bus load working module;

Bus load working module, used for load power supply;

The second voltage detection module is used to detect the output voltage of the first voltage detection module. When the voltage is lower than the threshold, construct a loop between the mains power supply module and the bus load working module;

Mains power supply module, used to provide 220V AC power supply to the bus load working module;

The output end of the photovoltaic power supply module is connected to the first input end of the first voltage detection module, and the output end of the first voltage detection module is connected to the first input end of the charge and discharge control module, the input end of the voltage output module, and the input end of the second voltage detection module. At the input end, the first output end of the charge and discharge control module is connected to the first input end of the bidirectional DC conversion module, the first output end of the bidirectional DC conversion module is connected to the input end of the battery storage module, and the output end of the battery storage module is connected to the bidirectional DC conversion The second input terminal of the module and the second output terminal of the bidirectional DC conversion module are connected to the second input terminal of the charge and discharge control module. The second output terminal of the charge and discharge control module is connected to the second input terminal of the first voltage detection module. The voltage output The output end of the module is connected to the input end of the DC to AC module, the output end of the DC to AC module is connected to the first input end of the bus load working module, the output end of the second voltage detection module is connected to the second input end of the bus load working module, The output terminal of the mains power supply module is connected to the third input terminal of the bus load working module.

As a further solution of the present invention: the first voltage detection module includes a first resistor, a first capacitor, a second resistor, a first diode, a second diode, a third resistor, a first triode, a second MOS tube, third diode, one end of the first resistor is connected to the output end of the photovoltaic power supply module, the other end of the first resistor is connected to one end of the first capacitor, one end of the second resistor, and the anode of the third diode. The other end of the two resistors is connected to the cathode of the first diode, the anode of the second diode, and one end of the third resistor. The other end of the third resistor is connected to ground, and the anode of the first diode is connected to the third port of the charge and discharge control module. An input terminal, the cathode of the third diode is connected to the input terminal of the voltage output module and the input terminal of the second voltage detection module, the cathode of the second diode is connected to the base of the first triode, and the first triode The emitter of the transistor is connected to the G pole of the second MOS transistor, the collector of the first transistor is connected to the S pole of the second MOS transistor and the 5V voltage, and the D pole of the second MOS transistor is connected to the first input terminal of the charge and discharge control module.

As a further solution of the present invention: the charge and discharge control module includes a third MOS tube and a fourth MOS tube. The G electrode of the third MOS tube is connected to the first output end of the first voltage detection module, and the G electrode of the fourth MOS tube is connected to The first output terminal of the first voltage detection module, the D terminal of the third MOS tube are connected to the S terminal of the fourth MOS tube and the second input terminal of the first voltage detection module, and the S terminal of the third MOS tube is connected to the bidirectional DC conversion module. The first input terminal and the D pole of the fourth MOS tube are connected to the second output terminal of the bidirectional DC conversion module.

As a further solution of the present invention: the voltage output module includes a sixth resistor, a seventh triode, an eighth triode, a first inductor, and a second capacitor. One end of the sixth resistor is connected to the collector of the seventh triode. , the collector of the eighth triode, the output end of the first voltage detection module, the other end of the sixth resistor is connected to the base of the seventh triode, and the emitter of the seventh triode is connected to the eighth triode The base and the emitter of the eighth transistor are connected to one end of the first inductor, the other end of the first inductor is connected to one end of the second capacitor and the input end of the DC to AC module, and the other end of the second capacitor is connected to ground.

As a further solution of the present invention: the DC to AC module includes a ninth MOS tube, a tenth MOS tube, an eleventh MOS tube, a twelfth MOS tube, and a transformer. The D pole of the ninth MOS tube is connected to the tenth MOS tube. The D pole is the output end of the voltage output module. The S pole of the ninth MOS tube is connected to the input end of the transformer and the D pole of the eleventh MOS tube. The S pole of the tenth MOS tube is connected to the other input end of the transformer and the tenth MOS tube. The D pole of the second MOS tube, the output end of the transformer is connected to the first input end of the bus load working module, the S pole of the eleventh MOS tube is grounded, the S pole of the twelfth MOS tube is grounded, and the G pole of the ninth MOS tube is connected The G electrode and PWM signal of the twelfth MOS tube, and the G electrode of the tenth MOS tube are connected to the G electrode and PWM signal of the eleventh MOS tube.

As a further solution of the present invention: the bus load working module includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch and a load. One end of the first switch is connected to one end of the fifth switch. , the output end of the DC to AC module, one end of the second switch is connected to one end of the sixth switch, the output end of the DC to AC module, the other end of the first switch is connected to the other end of the fifth switch, one end of the third switch, and the load One end of the load, the other end of the load is connected to the other end of the second switch, the other end of the sixth switch, and one end of the fourth switch. The other end of the third switch is connected to the output end of the mains power module, and the other end of the fourth switch is connected to The output terminal of the mains power module.

As a further solution of the present invention: the second voltage detection module includes a fourth resistor, a fifth resistor, a fourth diode, a fifth transistor, a relay, a fifth diode, a sixth MOS tube, and a fourth resistor. One end of the fourth resistor is connected to the output end of the first voltage detection module, the other end of the fourth resistor is connected to one end of the fifth resistor and the cathode of the fourth diode, the other end of the fifth resistor is connected to ground, and the anode of the fourth diode is connected to the The base of the fifth triode and the collector of the fifth triode are connected to one end of the relay, the cathode of the fifth diode and the 5V voltage. The emitter of the fifth triode is connected to the G pole of the sixth MOS tube. The D pole of the six MOS tubes is connected to ground, and the S pole of the sixth MOS tube is connected to the other end of the relay and the positive pole of the fifth diode.

Compared with the existing technology, the beneficial effects of the present invention are: by setting the charge and discharge control module, the present invention changes the charging rate of the battery storage module according to the output voltage of the photovoltaic power supply module; the MOS tube is used as the charge and discharge control module switch to avoid damage caused by frequent opening and closing; use MOS tubes as switches. When the switch is closed or opened, the voltage flowing through the MOS tube will be smaller, reducing the large current generated when the switch is closed or opened; set up a voltage output module, While ensuring a stable output voltage, a power supply delay is constructed to ensure stable voltage during the power supply switching process of the photovoltaic power supply module, battery storage module, and mains power module.

Description of the drawings

Figure 1 is a schematic diagram of a photovoltaic off-grid, city grid and energy storage hybrid power supply system.

Figure 2 is the first part of the circuit diagram of a photovoltaic off-grid, city grid and energy storage hybrid power supply system.

Figure 3 is the second part of the circuit diagram of a photovoltaic off-grid, city grid and energy storage hybrid power supply system.

Figure 4 is the third part circuit diagram of a photovoltaic off-grid, city grid and energy storage hybrid power supply system.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on The embodiments of the present invention and all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Please refer to Figure 1, a photovoltaic off-grid, city grid and energy storage hybrid power supply system, including:

Photovoltaic power supply module 1 is used to convert solar energy into electrical energy and output it to the first voltage detection module 2;

The first voltage detection module 2 is used to detect the magnitude of the input voltage, control whether and the degree of conduction of the charge and discharge control module 3 according to the magnitude of the input voltage, and provide power to the voltage output module 6;

The charge and discharge control module 3 is used to set two conductive lines. One conductive line outputs the voltage of the first voltage detection module 2 to the bidirectional DC conversion module 4, and the other conductive line outputs the voltage of the bidirectional DC conversion module 4. to the first voltage detection module 2;

The bidirectional DC conversion module 4 is used to convert the voltage output by the first voltage detection module 2 to DC to charge the battery storage module 5; or to convert the voltage output from the battery storage module 5 to DC to supply power to the voltage output module 6;

Battery storage module 5, used to store or output electrical energy;

The voltage output module 6 is used to provide stable direct current for the DC to AC module 7; to stabilize the voltage during the power supply switching process of the photovoltaic power supply module 1, battery storage module 5, and mains power supply module 10;

DC to AC module 7 is used to convert DC power into AC power and output it to the bus load working module 8;

Bus load working module 8, used for load X to get power;

The second voltage detection module 9 is used to detect the output voltage of the first voltage detection module 2. When the voltage is lower than the threshold, construct a loop between the mains power supply module 10 and the bus load working module 8;

The mains power supply module 10 is used to provide 220V AC power to the bus load working module 8;

The output end of the photovoltaic power supply module 1 is connected to the first input end of the first voltage detection module 2, and the output end of the first voltage detection module 2 is connected to the first input end of the charge and discharge control module 3, the input end of the voltage output module 6, and the first input end of the voltage output module 6. The input terminals of the two voltage detection modules 9, the first output terminal of the charge and discharge control module 3 is connected to the first input terminal of the bidirectional DC conversion module 4, and the first output terminal of the bidirectional DC conversion module 4 is connected to the input terminal of the battery storage module 5, The output end of the battery storage module 5 is connected to the second input end of the bidirectional DC conversion module 4. The second output end of the bidirectional DC conversion module 4 is connected to the second input end of the charge and discharge control module 3. The second output end of the charge and discharge control module 3 The terminal is connected to the second input terminal of the first voltage detection module 2, the output terminal of the voltage output module 6 is connected to the input terminal of the DC to AC module 7, and the output terminal of the DC to AC module 7 is connected to the first input terminal of the bus load working module 8 , the output terminal of the second voltage detection module 9 is connected to the second input terminal of the bus load working module 8 , and the output terminal of the mains power supply module 10 is connected to the third input terminal of the bus load working module 8 .

In a specific embodiment: please refer to FIG. 4 , the mains power supply module 10 includes a live wire L and a neutral wire N, and outputs 220V AC power through the live wire L and the neutral wire N to supply the bus load working module 8 .

In this embodiment: please refer to Figure 2. The first voltage detection module 2 includes a first resistor R1, a first capacitor C1, a second resistor R2, a first diode D1, a second diode D2, and a third resistor. R3, the first transistor V1, the second MOS tube V2, and the third diode D3. One end of the first resistor R1 is connected to the output end of the photovoltaic power supply module 1, and the other end of the first resistor R1 is connected to the output end of the first capacitor C1. One end, one end of the second resistor R2, the anode of the third diode D3, and the other end of the second resistor R2 are connected to the cathode of the first diode D1, the anode of the second diode D2, and one end of the third resistor R3. , the other end of the third resistor R3 is connected to ground, the anode of the first diode D1 is connected to the first input end of the charge and discharge control module 3, and the cathode of the third diode D3 is connected to the input end of the voltage output module 6 and the second voltage At the input end of the detection module 9, the cathode of the second diode D2 is connected to the base of the first transistor V1, and the emitter of the first transistor V1 is connected to the G pole of the second MOS tube V2. The collector of V1 is connected to the S pole and the 5V voltage of the second MOS transistor V2, and the D pole of the second MOS transistor V2 is connected to the first input end of the charge and discharge control module 3.

The photovoltaic power supply module 1 outputs the electric energy converted from solar energy. The voltage is the sum of the voltages on the first resistor R1, the second resistor R2, and the third resistor R3. The first diode D1 is a voltage stabilizing diode, and the second diode D2 is Current limiting diode, when the voltage supply of the photovoltaic power supply module 1 is at an intermediate value, the first diode D1 does not conduct, and the second diode D2 conducts, and does not drive the charge and discharge control module 3 to work, and the voltage passes through the first resistor R1 Output to the subsequent circuit;

When the supply voltage of the photovoltaic power supply module 1 is at a high value, the first diode D1 is turned on, and the second diode D2 is turned on, driving the charge and discharge control module 3 to work. After the charge and discharge control module 3 and the bidirectional DC conversion module 4. Charge the battery storage module 5, and at the same time, the voltage is output to the subsequent circuit through the first resistor R1;

When the supply voltage of the photovoltaic power supply module 1 is at a low value, the first diode D1 does not conduct, the second diode D2 does not conduct (the current limiting diode has a voltage drop of 0.7V), and the first transistor V1 is cut off. The G of the second MOS tube V2 (PMOS) is extremely low, and the second MOS tube V2 is turned on to drive the charge and discharge control module 3 to work. The battery storage module 5 outputs voltage through the bidirectional DC conversion module 4 and the charge and discharge control module 3. , powering the subsequent circuit.

In another embodiment: the third diode D3 can be omitted, and the third diode D3 is used to prevent the battery storage module 5 from supplying power to the photovoltaic power supply module 1 in reverse.

In this embodiment: please refer to Figure 2. The charge and discharge control module 3 includes a third MOS transistor V3 and a fourth MOS transistor V4. The G pole of the third MOS transistor V3 is connected to the first output end of the first voltage detection module 2. The G pole of the fourth MOS tube V4 is connected to the first output terminal of the first voltage detection module 2, and the D pole of the third MOS tube V3 is connected to the S pole of the fourth MOS tube V4 and the second input terminal of the first voltage detection module 2. , the S pole of the third MOS transistor V3 is connected to the first input terminal of the bidirectional DC conversion module 4 , and the D pole of the fourth MOS transistor V4 is connected to the second output terminal of the bidirectional DC conversion module 4 .

When the first diode D1 is turned on, the common point B is at a high level, driving the third MOS tube V3 (NMOS) to turn on, and the voltage passes through the third MOS tube V3 and the bidirectional DC conversion module 4 to charge the battery storage module 5. And as the output voltage of the photovoltaic power supply module 1 changes, the conduction degree of the third MOS tube V3 is changed to change the voltage output to the battery storage module 5, effectively ensuring the stability of the power output to the subsequent stage circuit;

When the second diode D2 is turned off, the common point C is at a high level, driving the fourth MOS transistor V4 (NMOS) to conduct, and the battery storage module 5 supplies power to the subsequent circuit through the bidirectional DC conversion module 4 and the fourth MOS transistor V4. .

Since the conduction degree of the MOS tube is limited by the voltage, the current flowing through the third MOS tube V3 and the fourth MOS tube V4 when they are turned on or off will be relatively small, so that large currents can be avoided when switching the battery storage module 5 for charging and power supply. to ensure the safety of power supply; and the MOS tube as a switching tube can adapt to frequent starts and stops.

In another embodiment: the MOS transistor can be replaced with other types of switching transistors.

In this embodiment: please refer to Figure 3. The voltage output module 6 includes a sixth resistor R6, a seventh transistor V7, an eighth transistor V8, a first inductor L1, a second capacitor C2. The sixth resistor R6 One end is connected to the collector of the seventh transistor V7, the collector of the eighth transistor V8, and the output end of the first voltage detection module 2. The other end of the sixth resistor R6 is connected to the base of the seventh transistor V7. The emitter of the seventh transistor V7 is connected to the base of the eighth transistor V8, the emitter of the eighth transistor V8 is connected to one end of the first inductor L1, and the other end of the first inductor L1 is connected to the second capacitor C2. One end is the input end of the DC to AC module 7, and the other end of the second capacitor C2 is connected to ground.

When the voltage is input, the sixth resistor R6 triggers the seventh transistor V7 to turn on, and then the seventh transistor V7 triggers the eighth transistor V8 to turn on. After the first inductor L1 and the second capacitor C2, the output is level circuit; the sixth resistor R6, the seventh transistor V7, and the eighth transistor V8 form an adjustment circuit, so that the input voltage outputs a stable voltage through the adjustment circuit to avoid voltage fluctuations; and the inductor current does not mutate, and the capacitor voltage does not mutate. This enables the circuit to ensure stable voltage during the power supply switching process of the photovoltaic power supply module 1, the battery storage module 5, and the mains power supply module 10.

In another embodiment, a resistor can be added to reduce the current output to the subsequent circuit.

In this embodiment: please refer to Figure 4, the DC to AC module 7 includes a ninth MOS tube V9, a tenth MOS tube V10, an eleventh MOS tube V11, a twelfth MOS tube V12, a transformer W, and a ninth MOS tube. The D pole of V9 is connected to the D pole of the tenth MOS transistor V10 and the output end of the voltage output module 6. The S pole of the ninth MOS transistor V9 is connected to the input end of the transformer W and the D pole of the eleventh MOS transistor V11. The S pole of the MOS tube V10 is connected to the other end of the input end of the transformer W and the D pole of the twelfth MOS tube V12. The output end of the transformer W is connected to the first input end of the bus load working module 8 and the S pole of the eleventh MOS tube V11. The S pole of the twelfth MOS tube V12 is grounded, the G pole of the ninth MOS tube V9 is connected to the G pole and PWM signal of the twelfth MOS tube V12, and the G pole of the tenth MOS tube V10 is connected to the eleventh MOS tube. G pole and PWM signal of V11.

The PWM signals received by the ninth MOS tube V9, the twelfth MOS tube V12, the tenth MOS tube V10, and the eleventh MOS tube V11 are complementary PWM signals with a duty cycle of 50% (that is, PWM1 and PWM2 in Figure 4 are Complementary PWM signal with a duty cycle of 50%), so that when the ninth MOS tube V9 and the twelfth MOS tube V12 are turned on, the tenth MOS tube V10 and the eleventh MOS tube V11 are turned off, and the tenth MOS tube V10 and the tenth MOS tube V10 are turned off. When the first MOS transistor V11 is turned on, the ninth MOS transistor V9 and the twelfth MOS transistor V12 are turned off, so that AC current is formed at the input end of the transformer W, which is amplified by the transformer W and then output to the bus load working module 8.

In another embodiment, the MOS transistor can be replaced by other types of switching transistors.

In this embodiment: please refer to Figure 4, the bus load working module 8 includes a first switch S1, a second switch S2, a third switch S3, a fourth switch S4, a fifth switch S5, a sixth switch S6, and a load X. One end of the first switch S1 is connected to one end of the fifth switch S5 and the output end of the DC to AC module 7 . One end of the second switch S2 is connected to one end of the sixth switch S6 and the output end of the DC to AC module 7 . The first switch S1 The other end of the load X is connected to the other end of the fifth switch S5, one end of the third switch S3, and one end of the load X. The other end of the load One end of the third switch S3 is connected to the output end of the mains power supply module 10 , and the other end of the fourth switch S4 is connected to the output end of the mains power supply module 10 .

The fifth switch S5 and the sixth switch S6 are normally open. When they are closed, they form a photovoltaic grid-connected state. When they are open, they form a photovoltaic off-grid state. When the supply voltage of the photovoltaic power supply module 1 is at an intermediate value or a high value, the photovoltaic power supply module 1 supplies power. Finally, Power is supplied through the DC to AC module 7; the supply voltage of the photovoltaic power supply module 1 is at a low value, and when the power supply voltage of the battery storage module 5 is sufficient, power is finally supplied through the DC to AC module 7. Under the above conditions, the first switch S1 and the second switch S2 closed, the third switch S3 and the fourth switch S4 pop open; when the supply voltage of the photovoltaic power supply module 1 is at a low value and the power supply voltage of the battery storage module 5 is insufficient, the second voltage detection module 9 drives the first switch S1 at this time. , the second switch S2 pops open, the third switch S3 and the fourth switch S4 are closed, and the power supply is switched to the mains power supply. The fifth switch S5 and the sixth switch S6 are controlled by relevant control circuits, which are existing technologies and will not be described again here.

In another embodiment, the fifth switch S5 and the sixth switch S6 can also be controlled manually.

In this embodiment: please refer to Figure 2. The second voltage detection module 9 includes a fourth resistor R4, a fifth resistor R5, a fourth diode D4, a fifth transistor V5, a relay J1, and a fifth diode. D5 and the sixth MOS transistor V6, one end of the fourth resistor R4 is connected to the output end of the first voltage detection module 2, the other end of the fourth resistor R4 is connected to one end of the fifth resistor R5 and the cathode of the fourth diode D4. The other end of the fifth resistor R5 is connected to ground, the anode of the fourth diode D4 is connected to the base of the fifth transistor V5, and the collector of the fifth transistor V5 is connected to one end of the relay J1 and the cathode of the fifth diode D5. , 5V voltage, the emitter of the fifth transistor V5 is connected to the G pole of the sixth MOS tube V6, the D pole of the sixth MOS tube V6 is connected to ground, and the S pole of the sixth MOS tube V6 is connected to the other end of the relay J1 and the fifth The anode of diode D5.

When either the photovoltaic power supply module 1 or the battery storage module 5 has sufficient power supply, the voltage at the common point A will be normal. At this time, the fourth diode D4 (regulator diode) is turned on, and the fifth transistor V5 is turned on. , causing the sixth MOS tube V6 (PMOS) to cut off, and the relay J1 does not work; when the photovoltaic power supply module 1 or the battery storage module 5 is insufficient in power supply, the sixth MOS tube V6 is turned on, and the relay J1 is energized to work and control the first switch. S1 and the second switch S2 spring open, and the third switch S3 and the fourth switch S4 are closed.

In another embodiment: the fifth resistor R5 can be replaced by a potentiometer to adjust the voltage at the common point A where the trigger relay J1 operates.

The working principle of the present invention is: the photovoltaic power supply module 1 is used to convert solar energy into electrical energy and output it to the first voltage detection module 2; the first voltage detection module 2 is used to detect the size of the input voltage and control charge and discharge control according to the size of the input voltage. Whether the module 3 is conductive or not and the degree of conduction; supplying power to the voltage output module 6; the charge and discharge control module 3 is used to set two conductive lines, one conductive line outputs the voltage of the first voltage detection module 2 to the bidirectional DC conversion Module 4, another conductive line outputs the voltage of the bidirectional DC conversion module 4 to the first voltage detection module 2; the bidirectional DC conversion module 4 is used to DC convert the voltage output by the first voltage detection module 2 into the battery storage module 5 Charging; or converting the voltage output by the battery storage module 5 to DC to supply power to the voltage output module 6; the battery storage module 5 is used to store or output electrical energy; the voltage output module 6 is used to provide stable direct current for the DC to AC module 7; in photovoltaic The power supply module 1, the battery storage module 5, and the mains power supply module 10 stabilize the voltage during the power supply switching process; the DC to AC module 7 is used to convert DC power into AC power and output it to the bus load working module 8; the bus load working module 8 is used for load X The second voltage detection module 9 is used to detect the output voltage of the first voltage detection module 2. When the voltage is lower than the threshold, a loop between the mains power supply module 10 and the bus load working module 8 is constructed; the mains power supply module 10 uses To provide 220V AC power to the bus load working module 8.

It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be regarded as illustrative and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is therefore intended that all claims falling within the claims All changes within the meaning and scope of equivalent elements are included in the present invention. Any reference signs in the claims shall not be construed as limiting the claim in question.

In addition, it should be understood that although this specification is described in terms of implementations, not each implementation only contains an independent technical solution. This description of the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole. , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims (5)

1. A photovoltaic off-grid, commercial network and energy storage hybrid power supply system is characterized in that:

the photovoltaic off-grid, commercial network and energy storage hybrid power supply system comprises:

the photovoltaic power supply module is used for converting solar energy into electric energy and outputting the electric energy to the first voltage detection module;

the first voltage detection module is used for detecting the magnitude of the input voltage and controlling whether the charge-discharge control module is conducted or not and the degree of conduction according to the magnitude of the input voltage; supplying power to the voltage output module;

the charge-discharge control module is used for setting two conducting circuits, one conducting circuit outputs the voltage of the first voltage detection module to the bidirectional DC conversion module, and the other conducting circuit outputs the voltage of the bidirectional DC conversion module to the first voltage detection module;

the bidirectional DC conversion module is used for charging the battery storage module after direct-current conversion of the voltage output by the first voltage detection module; or the voltage output by the battery storage module is converted into direct current and then is supplied to the voltage output module;

the battery storage module is used for storing or outputting electric energy;

the voltage output module is used for providing stable direct current for the DC-AC conversion module; the voltage is stabilized in the power supply switching process of the photovoltaic power supply module, the battery storage module and the mains supply module;

the DC-AC conversion module is used for converting direct current into alternating current and outputting the alternating current to the bus load working module;

the bus load working module is used for loading power;

the second voltage detection module is used for detecting the output voltage of the first voltage detection module, and when the voltage is lower than a threshold value, a loop of the mains supply module and the bus load working module is constructed;

a mains power module for providing 220V ac power to the bus load operation module;

the output end of the photovoltaic power supply module is connected with the first input end of the first voltage detection module, the output end of the first voltage detection module is connected with the first input end of the charge-discharge control module, the input end of the voltage output module and the input end of the second voltage detection module, the first output end of the charge-discharge control module is connected with the first input end of the bidirectional DC conversion module, the first output end of the bidirectional DC conversion module is connected with the input end of the battery storage module, the output end of the battery storage module is connected with the second input end of the bidirectional DC conversion module, the second output end of the bidirectional DC conversion module is connected with the second input end of the charge-discharge control module, the output end of the voltage output module is connected with the input end of the DC-AC conversion module, the output end of the DC-AC conversion module is connected with the first input end of the bus load working module, the output end of the second voltage detection module is connected with the second input end of the bus load working module, and the output end of the commercial power module is connected with the third input end of the bus load working module;

the charge-discharge control module comprises a third MOS tube and a fourth MOS tube, wherein the G electrode of the third MOS tube is connected with the first output end of the first voltage detection module, the G electrode of the fourth MOS tube is connected with the first output end of the first voltage detection module, the D electrode of the third MOS tube is connected with the S electrode of the fourth MOS tube and the second input end of the first voltage detection module, the S electrode of the third MOS tube is connected with the first input end of the bidirectional DC conversion module, and the D electrode of the fourth MOS tube is connected with the second output end of the bidirectional DC conversion module;

the voltage output module comprises a sixth resistor, a seventh triode, an eighth triode, a first inductor and a second capacitor, wherein one end of the sixth resistor is connected with a collector of the seventh triode, a collector of the eighth triode and an output end of the first voltage detection module, the other end of the sixth resistor is connected with a base of the seventh triode, an emitter of the seventh triode is connected with a base of the eighth triode, an emitter of the eighth triode is connected with one end of the first inductor, the other end of the first inductor is connected with one end of the second capacitor and an input end of the DC-AC module, and the other end of the second capacitor is grounded.

2. The photovoltaic grid-connected, mains supply and energy storage hybrid power supply system according to claim 1, wherein the first voltage detection module comprises a first resistor, a first capacitor, a second resistor, a first diode, a second diode, a third resistor, a first triode, a second MOS tube and a third diode, one end of the first resistor is connected with the output end of the photovoltaic power supply module, the other end of the first resistor is connected with one end of the first capacitor, one end of the second resistor and the positive electrode of the third diode, the other end of the second resistor is connected with the negative electrode of the first diode, the positive electrode of the second diode and one end of the third resistor, the other end of the third resistor is grounded, the positive electrode of the first diode is connected with the first input end of the charge-discharge control module, the negative electrode of the third diode is connected with the input end of the voltage output module, the input end of the second voltage detection module, the negative electrode of the second diode is connected with the base electrode of the first triode, the emitter of the first triode is connected with the G electrode of the second MOS tube, the collector of the first triode is connected with the S electrode of the second MOS tube, the collector electrode of the second MOS tube is connected with the S electrode of the second MOS tube, and the second MOS electrode is connected with the D electrode of the charge-discharge control module.

3. The photovoltaic grid-connected, commercial network and energy storage hybrid power supply system according to claim 1, wherein the DC-AC conversion module comprises a ninth MOS tube, a tenth MOS tube, an eleventh MOS tube, a twelfth MOS tube and a transformer, wherein the D pole of the ninth MOS tube is connected with the D pole of the tenth MOS tube, the output end of the voltage output module, the S pole of the ninth MOS tube is connected with one end of the input end of the transformer and the D pole of the eleventh MOS tube, the S pole of the tenth MOS tube is connected with the other end of the input end of the transformer, the D pole of the twelfth MOS tube, the output end of the transformer is connected with the first input end of the bus load working module, the S pole of the eleventh MOS tube is grounded, the S pole of the twelfth MOS tube is grounded, the G pole of the ninth MOS tube is connected with the G pole of the twelfth MOS tube, the PWM signal, and the G pole of the tenth MOS tube is connected with the G pole of the eleventh MOS tube.

4. The photovoltaic grid-connected, mains and energy storage hybrid power supply system according to claim 1, wherein the bus load working module comprises a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch and a load, one end of the first switch is connected with one end of the fifth switch and the output end of the DC-AC conversion module, one end of the second switch is connected with one end of the sixth switch and the output end of the DC-AC conversion module, the other end of the first switch is connected with the other end of the fifth switch, one end of the third switch and one end of the load, the other end of the load is connected with the other end of the second switch, the other end of the sixth switch and one end of the fourth switch, the other end of the third switch is connected with the output end of the mains module, and the other end of the fourth switch is connected with the output end of the mains module.

5. The photovoltaic grid-connected, city grid and energy storage hybrid power supply system according to claim 1, wherein the second voltage detection module comprises a fourth resistor, a fifth resistor, a fourth diode, a fifth triode, a relay, a fifth diode and a sixth MOS tube, one end of the fourth resistor is connected with the output end of the first voltage detection module, the other end of the fourth resistor is connected with one end of the fifth resistor and the cathode of the fourth diode, the other end of the fifth resistor is grounded, the anode of the fourth diode is connected with the base of the fifth triode, the collector of the fifth triode is connected with one end of the relay, the cathode of the fifth diode and 5V voltage, the emitter of the fifth triode is connected with the G pole of the sixth MOS tube, the D pole of the sixth MOS tube is grounded, the S pole of the sixth MOS tube is connected with the other end of the relay and the anode of the fifth diode.