Double-source parallel type self-balancing power supply method and device for cogeneration system and battery

Abstract

The invention provides a heat and power cogeneration system and battery double-source parallel type self-balancing power supply method and device, and belongs to the technical field of thermoelectric power generation. Firstly, a battery independently supplies power to a heating device, high-temperature gas exhausted by the heating device is introduced into a combined heat and power system, and a thermoelectric device directly converts heat energy into electric energy to be output; when the output voltage of the thermoelectric device reaches the voltage required by the heating device, the thermoelectric device and the battery are connected in parallel to supply power to the heating device; along with the increase of heat of high-temperature gas discharged by the heating device, the output current of the thermoelectric device is increased to gradually replace batteries connected in parallel; when the output current of the battery is gradually reduced to 0, the thermoelectric device charges the battery while supplying power to the heating device; according to the invention, the heat energy of the heating device can be fully utilized, the disadvantage of poor performance of the battery in a low-temperature state is made up, the battery is charged while the electricity demand of the heating device is met, the early-stage consumption of the battery is made up, and energy is stored for subsequent use.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature difference power generation, and in particular to a dual-source parallel self-balancing power supply method and device for outputting electric energy of a combined heat and power generation system and a battery, which is suitable for the working process of the combined heat and power generation system. Background Art

[0002] Energy shortage is an important challenge facing the world. Saving energy and improving energy efficiency have become the core themes of industrial development. Thermoelectric power generation technology is a technology that directly converts thermal energy into electrical energy based on semiconductor thermoelectric materials. However, since the output electrical energy of thermoelectric power generation technology cannot be reasonably utilized, it is not widely used.

[0003] For vehicles, when the vehicle cannot start normally in a low temperature environment, it is necessary to add a heating device in the vehicle to preheat the vehicle, but the heating device requires additional electrical energy to power it, and the battery performance degrades in low temperature conditions and cannot provide power for a long time.

[0004] The present invention aims at the problem of low energy utilization rate of temperature difference power generation technology and designs a self-balancing power supply solution in combination with the need for heating of vehicles. Summary of the invention

[0005] In view of this, the present invention provides a self-balancing power supply method and device of a combined heat and power system and a battery dual-source parallel connection. The scheme connects the combined heat and power system and the battery in parallel to supply power to a heating device in a vehicle in a time-sharing manner. The battery supplies power first to start the heating device, and the high-temperature gas discharged therefrom is introduced into the combined heat and power system. The thermal energy is directly converted into electrical energy through thermoelectric devices, and the heating system is supplied with power in parallel with the battery. The battery then slowly withdraws from power supply and is compensated by charging from the combined heat and power system, thereby realizing a self-balancing power supply based on a thermoelectric-battery dual-source parallel connection, making full use of the thermal energy of the heating device, while compensating for the disadvantage of the battery's poor performance at low temperatures, and charging the battery while meeting the power demand of the heating device, thereby compensating for the battery's early consumption and reserving energy for the next use.

[0006] In order to solve the above technical problems, the present invention is implemented as follows.

[0007] A dual-source parallel self-balancing power supply method of a combined heat and power system and a battery, used to power a heating device in a vehicle; the method includes a first stage and a second stage; Phase 1: The battery alone supplies power to the heating device. The high-temperature gas discharged from the heating device is passed into the combined heat and power system. The thermoelectric devices of the combined heat and power system convert thermal energy into electrical energy for output. When the output voltage of the combined heat and power system reaches the voltage required by the heating device, it enters phase 2. Phase 2: Thermoelectric devices and batteries are connected in parallel to power the heating device; as the heat of the high-temperature gas discharged by the heating device increases, the output current of the thermoelectric device increases, gradually replacing the parallel battery; when the battery output current gradually decreases to 0, the thermoelectric device starts to charge the battery while powering the heating device; based on the changes in the output voltage and current of the battery and the thermoelectric device, calculate the working time required for the thermoelectric device to meet the requirements of powering the heating device while compensating for the power consumption of the battery in phase 1 T ; Thermoelectric device working time reaches T After that, the thermoelectric device and the battery are stopped from supplying power to the heating device, and the heating device stops operating.

[0008] Preferably, when the thermoelectric device of the cogeneration system converts thermal energy into electrical energy for output, maximum power point tracking (MPPT) control is performed so that the electrical energy output by the thermoelectric device to the heating device operates at the maximum power point.

[0009] Preferably, the voltage output end of the thermoelectric device is connected to a buck circuit, which serves as the load of the thermoelectric device. The MPPT control process adjusts the output voltage of the thermoelectric device of the cogeneration system by controlling the duty cycle of the buck circuit, so that the electric energy output by the thermoelectric device to the heating device operates at the maximum power point.

[0010] Preferably, when performing the MPPT control, the output voltage V of the thermoelectric device collected at the current moment is subtracted from the voltage collected at the previous moment to obtain dV, the output current I of the thermoelectric device collected at the current moment is subtracted from the current collected at the previous moment to obtain dI, and the addition result of dI / dV and I / V is calculated; it is determined whether the addition result is greater than 0.01, and if so, the output voltage of the thermoelectric device is increased; if the addition result is less than 0.01, the output voltage of the thermoelectric device is reduced; if the addition result is between -0.01 and 0.01, no adjustment is made.

[0011] Preferably, the method further comprises: the output voltage of the thermoelectric device is output to the heating device after voltage stabilization control.

[0012] Preferably, the required operating time of the thermoelectric device is T The determination is based on the following calculation:

[0013] in, U is the voltage output from the thermoelectric device to the heating device, I is the current output from the thermoelectric device to the heating device, U B is the battery voltage, I B is the battery current, Uj The voltage required for the heating device, I j The current required for the heating device; for T 1. T 2. T 3. Start timing after the battery starts to supply power. T 1 is the independent working time of the battery in stage 1, T 2 is the time when the battery current decreases to 0, T 3 is the time when the output power of the thermoelectric device is stable.

[0014] Preferably, when the output current of the thermoelectric device of the combined heat and power system decreases, the battery starts to intervene to provide power.

[0015] The present invention also provides a dual-source parallel self-balancing power supply device of a combined heat and power system and a battery, which is used to power a heating device in a vehicle; the device comprises: a combined heat and power system, an MPPT algorithm controller, an output adjustment circuit, a voltage stabilizing module, a battery, a switch and a detection control module; The power output end of the thermoelectric device of the cogeneration system is connected to the MPPT algorithm controller and the output adjustment circuit, and the output adjustment circuit is connected to the voltage stabilizing module; the output end of the voltage stabilizing module is connected in parallel with the battery to supply power to the heating device; the switch is arranged on the output line of the voltage stabilizing module to connect or cut off the power supply of the voltage stabilizing module to the heating device; The detection control module is connected to the power output end of the thermoelectric device, the output end of the battery, the voltage stabilizing module, the switch and the heating device, and is used to control the operation of the self-balancing power supply device; the operation includes phase one and phase two; In the first stage, the detection control module controls the switch to be disconnected, and the battery alone supplies power to the heating device; the high-temperature gas discharged from the heating device is introduced into the cogeneration system, and the thermoelectric device of the cogeneration system converts the thermal energy into electrical energy for output; when the detection control module detects that the output voltage of the voltage stabilizing module reaches the voltage required by the heating device, the switch is controlled to be closed, and the process enters the second stage; In stage two, the thermoelectric device and the battery are connected in parallel to supply power to the heating device; the MPPT algorithm controller tracks the maximum power point of the output voltage of the thermoelectric device, and the MPPT algorithm controller controls the output adjustment circuit so that the electric energy output by the thermoelectric device to the heating device runs at the maximum power point, and then is loaded to the heating device through the voltage stabilizing module; as the heat of the high-temperature gas discharged by the heating device increases, the output current of the thermoelectric device increases, gradually replacing the parallel battery; when the battery output current gradually decreases to 0, the thermoelectric device starts to charge the battery while supplying power to the heating device; the detection control module calculates the working time required for the thermoelectric device to satisfy the requirement of supplying power to the heating device while compensating for the power consumption of the battery in stage one according to the changes in the output voltage and current of the battery and the thermoelectric device T ; Thermoelectric device working time reaches T After that, the heating device is controlled to stop running.

[0016] Preferably, the detection control module uses the following formula to calculate the required working time of the thermoelectric device: T :

[0017] in, U is the voltage output from the thermoelectric device to the heating device, I is the current output from the thermoelectric device to the heating device, U B is the battery voltage, I B is the battery current, U j The voltage required for the heating device, I j The current required for the heating device; T 1. T 2. T 3. Start timing after the battery starts to supply power. T 1 is the independent working time of the battery in stage 1, T 2 is the time when the battery current decreases to 0, T 3 is the time when the output power of the thermoelectric device is stable.

[0018] Preferably, the output adjustment circuit adopts a buck circuit, and the MPPT algorithm controller adjusts the output voltage of the thermoelectric device by controlling the duty cycle of the buck circuit; When the MPPT algorithm controller performs MPPT control, the output voltage V of the thermoelectric device collected at the current moment is subtracted from the voltage collected at the previous moment to obtain dV, the output current I of the thermoelectric device collected at the current moment is subtracted from the current collected at the previous moment to obtain dI, and the addition result of dI / dV and I / V is calculated; it is determined whether the addition result is greater than 0.01, and if so, the output voltage of the thermoelectric device is increased; if the addition result is less than 0.01, the output voltage of the thermoelectric device is reduced; if the addition result is between -0.01 and 0.01, no adjustment is made.

[0019] Beneficial effects: (1) The present invention discloses a heat and power system thermoelectric-battery dual-source parallel self-balancing power supply method, which connects the heat and power system in parallel with the battery. After the battery works for a period of time in the initial stage, the heat and power system gradually replaces the battery to start supplying power. While meeting the power demand of the heating system, the battery can be charged, which makes up for the initial consumption of the battery and reserves energy for the next use.

[0020] (2) The present invention discloses a thermoelectric-battery dual-source parallel self-balancing power supply method for a cogeneration system. By introducing a heating device into the cogeneration system, the heat energy waste caused by the use of the heating device is reduced, and at the same time, the disadvantage of the battery's poor performance at low temperatures is compensated.

[0021] (3) The present invention discloses a method for self-balancing power supply of a thermoelectric-battery dual-source parallel combined heat and power system. By connecting the combined heat and power system in parallel with a battery, thermal energy is directly converted into electrical energy without the need for additional electrical energy, thereby achieving self-balancing power supply for the heating device.

[0022] (4) In order to solve the problem of low output power and low output efficiency of the cogeneration system, the MPPT control method is adopted in the controller after the output of the cogeneration system is passed to stabilize the output power of the cogeneration system near its maximum power point, thereby improving the output performance of the cogeneration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of a thermoelectric-battery dual-source parallel self-balancing power supply scheme of a combined heat and power system of the present invention; Figure 2 It is a schematic diagram of the composition of a thermoelectric-battery dual-source parallel self-balancing power supply device of a combined heat and power system in a preferred embodiment of the present invention; Figure 3 A schematic diagram of electric energy changes in a thermoelectric-battery dual-source parallel self-balancing power supply method for a combined heat and power system disclosed in the present invention; Figure 4 PV curve diagram of the thermoelectric array. DETAILED DESCRIPTION

[0024] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0025] The present invention provides a combined heat and power system-battery dual-source parallel self-balancing power supply solution, in which the combined heat and power system and the battery are connected in parallel to power the heating device in the vehicle. Figure 1 As shown, the program is divided into two stages: Phase 1: First, the battery is used to power the heating device to start working, and then the high-temperature gas provided by the heating device is introduced into the combined heat and power system. The thermoelectric device directly converts the thermal energy into electrical energy output. When the output voltage of the combined heat and power system reaches the voltage required by the heating device, it enters phase 2. Phase 2: Thermoelectric devices and batteries are connected in parallel to power the heating device. As the output current of the thermoelectric device increases, the output current of the thermoelectric device increases and gradually replaces the parallel battery; when the battery output current gradually decreases to 0, the thermoelectric device starts to reverse charge the battery while powering the heating device. Based on the changes in the output voltage and current of the battery and thermoelectric device, calculate the working time required for the thermoelectric device to meet the requirements of powering the heating device while compensating for the battery's energy consumption in phase one. T ; Thermoelectric device working time reaches T After that, the thermoelectric device and the battery stop supplying power to the heating device, and the heating device stops running. T Previously, if the output power of the cogeneration system was not enough to support the power consumption of the heating device for some reason, the battery would start to provide power, realizing dual-source parallel self-balancing power supply.

[0026] Figure 2 The schematic diagram of the heat and power cogeneration system and the battery dual-source parallel self-balancing power supply method in the preferred embodiment of the present invention is shown. The diagram can also be regarded as a block diagram of the heat and power cogeneration system and the battery dual-source parallel self-balancing power supply device. Figure 2As shown, the self-balancing power supply device includes a combined heat and power system, an MPPT algorithm controller, an output adjustment circuit, a voltage stabilizing module, a battery, a switch and a detection control module (not shown in the figure). As shown in the figure, the power output end of the thermoelectric device of the combined heat and power system is connected to the MPPT algorithm controller and the output adjustment circuit, and the output adjustment circuit is connected to the voltage stabilizing module; the output end of the voltage stabilizing module is connected in parallel with the battery to supply power to the heating device; the switch is set on the output line of the voltage stabilizing module to connect or cut off the power supply of the voltage stabilizing module to the heating device. The detection control module is connected to the power output end of the thermoelectric device, the output end of the battery, the voltage stabilizing module, the switch and the heating device, and is used to collect state quantities and control the work of the self-balancing power supply device. The detection control module includes a control computer, some control circuits and state monitoring equipment. The work of the detection control module includes: collecting voltage and current from the power output end of the thermoelectric device, collecting voltage and current from the output end of the battery; monitoring the power of the output signal of the voltage stabilizing module; controlling the opening and closing of the switch; and controlling whether the heating device works or not.

[0027] In this preferred embodiment, the output adjustment circuit adopts a buck circuit, and the MPPT algorithm controller adjusts the output voltage of the cogeneration system by controlling the duty cycle of the buck circuit.

[0028] The specific implementation process of the heat and power cogeneration system and battery dual-source parallel self-balancing power supply method of the present invention includes the following steps: Step 1: First enter phase 1. The control switch of the detection control module is disconnected. The battery starts to supply power to support the heating device to start working. The heating device discharges high-temperature gas into the collector of the combined heat and power system. At the same time, cooling water is introduced into the radiator of the combined heat and power system. The high-temperature gas and cooling water form a temperature difference at both ends of the thermoelectric sheet, generating a potential difference and outputting electrical energy. When the battery starts to supply power, the timing starts.

[0029] Step 2: Collect the voltage, current and working time of the electric energy output by the cogeneration system described in step 1, as well as the working voltage, working current and working time of the battery.

[0030] In this step, the detection control module starts timing when the battery starts to supply power; at the same time, an oscilloscope device is used to collect the voltage and current of the cogeneration system and the battery.

[0031] Step 3: The electric energy generated by the combined heat and power system in step 1 is connected to the MPPT controller, and maximum power point tracking control is performed based on the DC-DC circuit.

[0032] In this step, the voltage collected at the current moment is subtracted from the voltage collected at the previous moment to obtain dV, and the current collected at the current moment is subtracted from the current collected at the previous moment to obtain dI, and dI / dV and I / V at this time are calculated.

[0033] As a preferred method, the DC-DC circuit uses a buck circuit combined with an admittance increment method to control the duty cycle. The admittance increment method is based on Figure 4 The output power-output voltage characteristic curve shown in the figure is self-optimizing. Each control is recorded as a control cycle. In each control cycle, the output voltage is adjusted, the dV / dI and I / V calculated this time are added, and the voltage is increased or decreased by judging the positive or negative value of the sum. In this way, the output power can be adjusted to be close to the maximum power point. It is adjusted and controlled for the purpose of optimizing the output power. The specific method is as follows: When the combined heat and power system is at the maximum power point, the relationship shown in equation (1) holds: (1) If the value obtained by adding the calculated dI / dV to I / V is greater than 0.01, the input voltage of the cogeneration system needs to be increased. When the value obtained by adding the calculated dI / dV to I / V is less than -0.01, the input voltage of the cogeneration system needs to be reduced. When the value obtained by adding the calculated dI / dV to I / V is between -0.01 and 0.01, no operation is required. Among them, 0.01 is the preferred value determined by experiment.

[0034] The voltage increase or decrease of the combined heat and power system is achieved by adjusting the duty cycle of the buck circuit. The buck circuit has a relationship as shown in Formula 2, so when the input voltage needs to be increased, the duty cycle can be reduced in steps of 0.01, and when the input voltage needs to be reduced, the duty cycle can be increased in steps of 0.01.

[0035] (2) in, VO is the buck circuit output voltage, D is the duty cycle, VI Input voltage for the buck circuit.

[0036] Under the control of the MPPT controller, the output power of the thermoelectric devices in the cogeneration system operates at the maximum power point.

[0037] Step 4: Input the output electric energy through the MPPT controller into the voltage stabilizing module. When the output voltage of the thermoelectric device is stabilized to the voltage required by the heating device through the voltage stabilizing module, the voltage required in this embodiment is 28V, then enter stage 2.

[0038] Step 5: After entering phase 2, the detection control module turns on the switch between the combined heat and power system and the battery, so that the combined heat and power system gradually replaces the battery to power the heating device. As the heat of the high-temperature gas discharged by the heating device increases, the output current of the thermoelectric device increases, gradually reducing the output current of the battery.

[0039] Step 6: The detection control module records the curves of the voltage and current of the cogeneration system passing through the MPPT controller and the voltage stabilizing module over time during step 5, and also records the curves of the voltage and current of the battery over time.

[0040] In this step, an oscilloscope 1 can be used to measure the curves of the voltage and current outputted by the voltage stabilizing module changing with time, and an oscilloscope 2 can be used to measure the curves of the voltage and current outputted by the battery changing with time.

[0041] Step 7: Figure 3 As shown in the schematic diagram of electric energy change, the specific working time T of the cogeneration system is calculated according to the parameters of the cogeneration system and the battery parameters recorded in step six.

[0042] In this step, the working time required for the combined heat and power system to supply power to the heating device and compensate for the power consumption of the battery at the beginning is calculated according to Formula 3. T , the time calculated in this embodiment is, for example, 8 minutes.

[0043] (3) in, U is the regulator output voltage, I is the regulator output current, U B is the battery voltage, I B is the battery current, T 2 is the time when the battery starts to change from discharge state to charge state, U j The voltage required for the heating device, I j is the current required by the heating device. T 1. T 2 and T 3. Start timing and monitor the battery current and output power of the voltage regulator module after the battery starts to supply power. When the voltage of the voltage regulator module reaches 28V, the time is recorded as T 1, T 1 is the independent working time of the battery; when the battery current decreases to zero, the time is recorded as T2, and when the output power of the voltage regulator module is stable, the time is recorded as T 3. The stability can be judged as follows: when the power change within 5 seconds is less than 0.1W, the power can be considered stable.

[0044] In the above formula, Indicates the power output of the combined heat and power system before power stabilization. It represents the electric energy output of the combined heat and power system after the power is stabilized. Indicates the power output of the battery alone before the combined heat and power system works. Indicates the power consumption of the battery when the combined heat and power system and the battery are powered at the same time. Indicates the electrical energy demand of the heating device during the working time T.

[0045] Combination Figure 3 As shown in the figure, from the beginning to T1, the electric energy demand of the heating device is completely provided by the battery. From T1 to T2, since the heating device provides heat energy for the combined heat and power system to generate electricity, but since heat conduction takes time, the output electric energy gradually increases and can reach stability after a period of time. In this process, the output voltage of the voltage regulator module reaches 28V and the output current gradually increases. The power supply of the battery gradually decreases and starts charging at T2. From T2 to T3, the output electric energy of the combined heat and power system continues to increase, increasing the electric energy for charging the battery. After T3, the combined heat and power system outputs stably, and stably charges the battery while supplying power to the heating device. By calculating that when the time reaches T, the combined heat and power system provides enough electric energy for the heating device, and the power supply to the heating device can be cut off to avoid wasting fuel. At the same time, the combined heat and power system also charges the battery, making up for the previous consumption of the battery and reserving energy for the next use.

[0046] Step 8: The time calculated in step 7 T By stopping the operation of the heating device after the combined heat and power system has been working for 8 minutes, the combined heat and power system can supply power to the heating device while keeping the battery power greater than or equal to the state before use, thereby achieving a self-balancing power supply of the combined heat and power system-battery dual-source parallel type.

[0047] The above specific embodiments only describe the design principle of the present invention. The shapes and names of the components in the description may be different and are not limited. Therefore, those skilled in the art in the field of the present invention may modify or replace the technical solutions recorded in the above embodiments; and these modifications and replacements do not deviate from the creative purpose and technical solutions of the present invention and should all fall within the protection scope of the present invention.

Claims

1. A self-balancing power supply method for a combined heat and power system and a battery dual-source parallel connection, used to power a heating device in a vehicle; characterized in that: The method consists of phases one and two; Phase 1: The battery alone supplies power to the heating device. The high-temperature gas discharged from the heating device is passed into the combined heat and power system. The thermoelectric devices of the combined heat and power system convert thermal energy into electrical energy for output. When the output voltage of the combined heat and power system reaches the voltage required by the heating device, it enters phase 2. Phase 2: Thermoelectric devices and batteries are connected in parallel to power the heating device; as the heat of the high-temperature gas discharged by the heating device increases, the output current of the thermoelectric device increases, gradually replacing the parallel battery; when the battery output current gradually decreases to 0, the thermoelectric device starts to charge the battery while powering the heating device; based on the changes in the output voltage and current of the battery and the thermoelectric device, calculate the working time required for the thermoelectric device to meet the requirements of powering the heating device while compensating for the power consumption of the battery in phase 1 T ; Thermoelectric device working time reaches T After that, the thermoelectric device and the battery are stopped from supplying power to the heating device, and the heating device stops operating.

2. The method for self-balancing power supply of a combined heat and power generation system and a battery dual-source parallel connection according to claim 1, characterized in that: When the thermoelectric device of the cogeneration system converts thermal energy into electrical energy for output, maximum power point tracking (MPPT) control is performed so that the electrical energy output by the thermoelectric device to the heating device operates at the maximum power point.

3. The heat and power cogeneration system and battery dual-source parallel self-balancing power supply method according to claim 2, characterized in that: The voltage output end of the thermoelectric device is connected to the buck circuit, which serves as the load of the thermoelectric device. The MPPT control process adjusts the output voltage of the thermoelectric device in the cogeneration system by controlling the duty cycle of the buck circuit, so that the electric energy output by the thermoelectric device to the heating device runs at the maximum power point.

4. The heat and power cogeneration system and battery dual-source parallel self-balancing power supply method according to claim 2, characterized in that: When performing the MPPT control, the output voltage V of the thermoelectric device collected at the current moment is subtracted from the voltage collected at the previous moment to obtain dV, the output current I of the thermoelectric device collected at the current moment is subtracted from the current collected at the previous moment to obtain dI, and the addition result of dI / dV and I / V is calculated; it is determined whether the addition result is greater than 0.01, and if so, the output voltage of the thermoelectric device is increased; if the addition result is less than 0.01, the output voltage of the thermoelectric device is reduced; if the addition result is between -0.01 and 0.01, no adjustment is made.

5. The method for self-balancing power supply of a combined heat and power generation system and a battery dual-source parallel connection according to any one of claims 1 to 4, characterized in that: The method further comprises: the output voltage of the thermoelectric device is output to the heating device after voltage stabilization control.

6. The heat and power cogeneration system and battery dual-source parallel self-balancing power supply method according to claim 1, characterized in that: Thermoelectric device required working time T The determination is based on the following calculation: in, U is the voltage output from the thermoelectric device to the heating device, I is the current output from the thermoelectric device to the heating device, U B is the battery voltage, I B is the battery current, U j The voltage required for the heating device, I j The current required for the heating device; for T 1. T 2. T 3. Start timing after the battery starts to supply power. T 1 is the independent working time of the battery in stage 1, T 2 is the time when the battery current decreases to 0, T 3 is the time when the output power of the thermoelectric device is stable.

7. The method for self-balancing power supply of a combined heat and power generation system and a battery dual-source parallel connection according to claim 1, characterized in that: When the output current of the thermoelectric device in the cogeneration system decreases, the battery begins to intervene to provide power.

8. A heat and power cogeneration system and battery dual-source parallel self-balancing power supply device, used to power a heating device in a vehicle; characterized in that: The device includes: a combined heat and power system, an MPPT algorithm controller, an output adjustment circuit, a voltage stabilization module, a battery, a switch and a detection control module; The power output end of the thermoelectric device of the cogeneration system is connected to the MPPT algorithm controller and the output adjustment circuit, and the output adjustment circuit is connected to the voltage stabilizing module; the output end of the voltage stabilizing module is connected in parallel with the battery to supply power to the heating device; the switch is arranged on the output line of the voltage stabilizing module to connect or cut off the power supply of the voltage stabilizing module to the heating device; The detection control module is connected to the power output end of the thermoelectric device, the output end of the battery, the voltage stabilizing module, the switch and the heating device, and is used to control the operation of the self-balancing power supply device; the operation includes phase one and phase two; In the first stage, the detection control module controls the switch to be disconnected, and the battery alone supplies power to the heating device; the high-temperature gas discharged from the heating device is introduced into the cogeneration system, and the thermoelectric device of the cogeneration system converts the thermal energy into electrical energy for output; when the detection control module detects that the output voltage of the voltage stabilizing module reaches the voltage required by the heating device, the switch is controlled to be closed, and the process enters the second stage; In stage two, the thermoelectric device and the battery are connected in parallel to supply power to the heating device; the MPPT algorithm controller tracks the maximum power point of the output voltage of the thermoelectric device, and the MPPT algorithm controller controls the output adjustment circuit so that the electric energy output by the thermoelectric device to the heating device runs at the maximum power point, and then is loaded to the heating device through the voltage stabilizing module; as the heat of the high-temperature gas discharged by the heating device increases, the output current of the thermoelectric device increases, gradually replacing the parallel battery; when the battery output current gradually decreases to 0, the thermoelectric device starts to charge the battery while supplying power to the heating device; the detection control module calculates the working time required for the thermoelectric device to satisfy the requirement of supplying power to the heating device while compensating for the power consumption of the battery in stage one according to the changes in the output voltage and current of the battery and the thermoelectric device T ; Thermoelectric device working time reaches T After that, the heating device is controlled to stop running.

9. The heat and power cogeneration system and battery dual-source parallel self-balancing power supply device according to claim 8, characterized in that: The detection control module uses the following formula to calculate the required working time of the thermoelectric device T : in, U is the voltage output from the thermoelectric device to the heating device, I is the current output from the thermoelectric device to the heating device, U B is the battery voltage, I B is the battery current, U j The voltage required for the heating device, I j The current required for the heating device; T 1. T 2. T 3. Start timing after the battery starts to supply power. T 1 is the independent working time of the battery in stage 1, T 2 is the time when the battery current decreases to 0, T 3 is the time when the output power of the thermoelectric device is stable.

10. The heat and power cogeneration system and battery dual-source parallel self-balancing power supply device according to claim 8, characterized in that: The output adjustment circuit adopts a buck circuit, and the MPPT algorithm controller adjusts the output voltage of the thermoelectric device by controlling the duty cycle of the buck circuit; When the MPPT algorithm controller performs MPPT control, the output voltage V of the thermoelectric device collected at the current moment is subtracted from the voltage collected at the previous moment to obtain dV, the output current I of the thermoelectric device collected at the current moment is subtracted from the current collected at the previous moment to obtain dI, and the addition result of dI / dV and I / V is calculated; it is determined whether the addition result is greater than 0.01, and if so, the output voltage of the thermoelectric device is increased; If the added result is less than 0.01, the output voltage of the thermoelectric device is reduced; if the added result is between -0.01 and 0.01, no adjustment is performed.

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