Multi-power system output control device and method

Abstract

A multi-power-system output control device and method, the multi-power-system output control device comprises a fuel cell unit, a lithium battery unit and a control unit, the fuel cell unit comprises a fuel cell and a first conversion module electrically connected with the fuel cell, the lithium battery unit comprises a lithium battery, and the first conversion module is electrically connected with the lithium battery. The first conversion module is electrically connected with the lithium battery, the second conversion module is electrically connected with the lithium battery and the first conversion module, the control unit is electrically connected with the first conversion module and the second conversion module, a power optimization data table is arranged in the control unit, and the control unit can operate among different modes. The control unit controls the first conversion module to draw the electric power of the fuel cell at the first optimal power and controls the second conversion module to draw the electric power of the lithium battery at the second optimal power, and different modes can be executed according to different conditions, so that the electric power allocation is more flexible and efficient.

Description

Technical Field

[0001] The present invention relates to a control device, and in particular to a multi-power system output control device and method. Background Art

[0002] Today's electric vehicles are powered by a lithium battery. Due to the size and weight of the lithium battery, the vehicle's endurance is greatly limited. The charging time of the lithium battery is also a major problem that affects the endurance. Therefore, the inventor proposed a multi-power supply distribution system and distribution method in Taiwan Patent No. I645649, China, to establish an output power reference table to distribute power usage to solve the problem of power and charging time.

[0003] However, the above method does not take into account the countermeasures when the power source is unstable, so the inventor believes that further improvement is necessary. Summary of the invention

[0004] The object of the present invention is to provide a multi-power system output control device and method that overcomes the shortcomings of the background technology.

[0005] The multi-power system output control device of the present invention comprises a lithium battery unit, wherein the lithium battery unit comprises a lithium battery, the multi-power system output control device further comprises a fuel cell unit, a load unit, and a control unit, wherein the fuel cell unit comprises a fuel cell, and a first conversion module electrically connected to the fuel cell, the lithium battery unit further comprises a second conversion module electrically connected to the lithium battery and the first conversion module, the load unit is electrically connected to the first conversion module and the second conversion module, the load unit is used to receive the electric energy output by the first conversion module and the second conversion module, the control unit is electrically connected to the first conversion module and the second conversion module, the control unit has a built-in power optimization data table, the power optimization data table comprises a plurality of power parameter sets, each power parameter set has a power setting value, a first optimal power and a second optimal power, the control unit can operate between a first mode, a second mode, a third mode, a fourth mode and a fifth mode, in the first mode, the control unit controls the first conversion module to draw the power of the fuel cell at the maximum power, so that the first conversion module outputs the power to the load unit and the second conversion module, and the control unit also controls the second conversion module to output the power to the load unit and the second conversion module. The conversion module outputs power to the lithium battery for charging. In the second mode, the control unit controls the first conversion module to draw power from the fuel cell at a first predetermined power lower than the maximum power, so that the first conversion module outputs power to the load unit. In the third mode, the control unit controls the first conversion module to draw power from the fuel cell at a preset low power, and the control unit controls the second conversion module to draw power from the lithium battery at a second predetermined power, so that the first conversion module and the second conversion module jointly output power to the load unit. In the fourth mode, the control unit controls the first conversion module, the second conversion module and the load unit to stop operating. In the fifth mode, the control unit selects one of the power parameter sets as the selected power parameter set, and controls the first conversion module to draw power from the fuel cell at the first optimal power of the selected power parameter set, and the control unit controls the second conversion module to draw power from the lithium battery at the second optimal power of the selected power parameter set, so that the first conversion module and the second conversion module jointly output power to the load unit.

[0006] In the multi-power system output control device of the present invention, the control unit can execute an optimization program to establish the power optimization data table. In the optimization program, the control unit establishes the power setting value, and establishes multiple fuel cell power setting values ​​corresponding to the fuel cell and multiple lithium battery power setting values ​​corresponding to the lithium battery according to each power setting value, and defines each fuel cell power setting value and the corresponding lithium battery power setting value as a power combination. The control unit calculates each power combination to obtain multiple optimal energy usage combinations corresponding to the power setting values, and stores the fuel cell power setting value and the lithium battery power setting value corresponding to each optimal energy usage combination as the first optimal power and the second optimal power corresponding to the power setting value, respectively.

[0007] In the multi-power system output control device of the present invention, when calculating the optimal energy usage combination of one of the power setting values, the control unit performs calculations based on the fuel cell power setting value of one of the power combinations to obtain a first efficiency parameter, and performs calculations based on the corresponding lithium battery power setting value to obtain a second efficiency parameter, and adds the first efficiency parameter and the second efficiency parameter to obtain a total efficiency parameter, and after calculating all the total efficiency parameters corresponding to one of the power setting values, the control unit stores the fuel cell power setting value and the lithium battery power setting value corresponding to the smallest one of the total efficiency parameters as the first optimal power and the second optimal power corresponding to the power setting value, respectively.

[0008] In the multi-power system output control device of the present invention, when calculating one of the first efficiency parameters, the control unit determines whether the fuel cell voltage corresponding to the corresponding fuel cell power setting value is greater than the minimum input voltage of the first conversion module based on the pre-stored fuel cell parameter table. If so, the first efficiency parameter is equal to the fuel cell power setting value divided by a first constant. If not, the first efficiency parameter is equal to the fuel cell power setting value plus a penalty value divided by the first constant.

[0009] In the multi-power system output control device of the present invention, when calculating one of the second efficiency parameters, the control unit determines, based on a pre-stored lithium battery parameter table, whether a discharge depth parameter of the corresponding lithium battery power setting value after being divided by the corresponding discharge parameter is greater than a preset discharge value; if not, the second efficiency parameter is equal to the lithium battery power setting value divided by a second constant; if so, the second efficiency parameter is equal to the lithium battery power setting value plus the penalty value divided by the second constant.

[0010] In the multi-power system output control device of the present invention, the control unit receives fuel cell status information output by the fuel cell and lithium battery status information output by the lithium battery. When the fuel cell status information shows that the operation of the fuel cell is normal and the lithium battery status information shows that the power level of the lithium battery is lower than a preset lower limit, the control unit calculates the required power predetermined to be compensated by the first conversion module. When the required power is not greater than the maximum power, the control unit executes the first mode. When the required power is greater than the maximum power, the control unit executes the second mode.

[0011] In the multi-power system output control device of the present invention, the control unit receives the fuel cell status information output by the fuel cell and the lithium battery status information output by the lithium battery. When the fuel cell status information shows that the operation of the fuel cell is abnormal, the control unit executes the third mode. After the control unit executes the third mode, and the lithium battery status information shows that the power level of the lithium battery is lower than a preset lower limit value, the control unit executes the fourth mode.

[0012] In the multi-power system output control device of the present invention, the control unit receives the fuel cell status information output by the fuel cell and the lithium battery status information output by the lithium battery. When the fuel cell status information shows that the operation of the fuel cell is normal and the lithium battery status information shows that the power level of the lithium battery is not lower than a preset lower limit value, the control unit executes the fifth mode.

[0013] The output control method of a multi-power system of the present invention comprises the following steps: (A) establishing a power optimization data table through a control unit, wherein the power optimization data table comprises a plurality of power parameter sets, each power parameter set having a power setting value, a first optimal power and a second optimal power, wherein the control unit establishes a plurality of fuel cell power setting values ​​corresponding to the fuel cell and a plurality of lithium battery power setting values ​​corresponding to the lithium battery according to each power setting value, and defines each fuel cell power setting value and the corresponding lithium battery power setting value as a power combination, wherein the control unit calculates each power combination to obtain a plurality of optimal energy use combinations corresponding to the power setting values, and stores the fuel cell power setting value and the lithium battery power setting value corresponding to each optimal energy use combination as the first optimal power and the second optimal power corresponding to the power setting value, respectively. (B) the control unit executes a first mode, wherein in the first mode, the control unit controls a first conversion module electrically connected to the fuel cell to draw power from the fuel cell at a maximum power, so that the first conversion module outputs power to a load unit and a second conversion module electrically connected to the lithium battery, and the control unit controls the second conversion module to output power to the lithium battery for charging. (C) The control unit executes the second mode. In the second mode, the control unit controls the first conversion module to draw power from the fuel cell at a first predetermined power lower than the maximum power, so that the first conversion module outputs power to the load unit. (D) The control unit executes the third mode. In the third mode, the control unit controls the first conversion module to draw power from the fuel cell at a preset low power, and the control unit controls the second conversion module to draw power from the lithium battery at a second predetermined power, so that the first conversion module and the second conversion module jointly output power to the load unit. (E) The control unit executes the fourth mode. In the fourth mode, the control unit controls the first conversion module, the second conversion module and the load unit to stop operating. (F) The control unit executes the fifth mode. In the fifth mode, the control unit selects one of the power parameter sets as the selected power parameter set, and controls the first conversion module to draw power from the fuel cell at the first optimal power of the selected power parameter set, and controls the second conversion module to draw power from the lithium battery at the second optimal power of the selected power parameter set, so that the first conversion module and the second conversion module jointly output power to the load unit.

[0014] In the multi-power system output control method of the present invention, when calculating the optimal energy usage combination of one of the power setting values, the control unit performs calculations based on the fuel cell power setting value of one of the power combinations to obtain a first efficiency parameter, and performs calculations based on the corresponding lithium battery power setting value to obtain a second efficiency parameter, and adds the first efficiency parameter and the second efficiency parameter to obtain a total efficiency parameter, and after calculating all the total efficiency parameters corresponding to one of the power setting values, the control unit stores the fuel cell power setting value and the lithium battery power setting value corresponding to the smallest one of the total efficiency parameters as the first optimal power and the second optimal power corresponding to the power setting value, respectively.

[0015] In the multi-power system output control method of the present invention, when calculating one of the first efficiency parameters, the control unit determines whether the fuel cell voltage corresponding to the corresponding fuel cell power setting value is greater than the minimum input voltage of the first conversion module based on the pre-stored fuel cell parameter table. If so, the first efficiency parameter is equal to the fuel cell power setting value divided by a first constant. If not, the first efficiency parameter is equal to the fuel cell power setting value plus a penalty value divided by the first constant.

[0016] In the multi-power system output control method of the present invention, when calculating one of the second efficiency parameters, the control unit determines whether the discharge depth parameter of the corresponding lithium battery power setting value after being divided by the corresponding discharge parameter is greater than the preset discharge value based on the pre-stored lithium battery parameter table. If not, the second efficiency parameter is equal to the lithium battery power setting value divided by the second constant. If so, the second efficiency parameter is equal to the lithium battery power setting value plus the penalty value divided by the second constant.

[0017] The multi-power system output control method described in the present invention also includes steps (G) and (H). In step (G), the control unit receives fuel cell status information output by the fuel cell and lithium battery status information output by the lithium battery. In step (H), when the fuel cell status information shows that the operation of the fuel cell is normal and the lithium battery status information shows that the power level of the lithium battery is lower than a preset lower limit, the control unit calculates the required power predetermined to be compensated by the first conversion module. When the required power is not greater than the maximum power, the control unit executes step (B). When the required power is greater than the maximum power, the control unit executes step (C).

[0018] The multi-power system output control method of the present invention also includes step (G). In step (G), the control unit receives fuel cell status information output by the fuel cell and lithium battery status information output by the lithium battery. When the fuel cell status information shows that the operation of the fuel cell is abnormal, the control unit executes step (D). After the control unit executes the third mode, and the lithium battery status information shows that the power level of the lithium battery is lower than a preset lower limit value, the control unit executes step (E).

[0019] The multi-power system output control method of the present invention also includes step (G). In step (G), the control unit receives fuel cell status information output by the fuel cell and lithium battery status information output by the lithium battery. When the fuel cell status information shows that the operation of the fuel cell is normal and the lithium battery status information shows that the power level of the lithium battery is not lower than a preset lower limit value, the control unit executes step (F).

[0020] The beneficial effects of the present invention are as follows: the multi-power system output control device and method of the present invention can execute different modes in response to different conditions, making power allocation more flexible, and when the control unit executes the fifth mode, the fuel cell and the lithium battery can be used with optimal efficiency through the power optimization data table. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a block diagram of an embodiment of a multi-power system output control device of the present invention;

[0022] Figure 2 is a flow chart of the multi-power system output control method of the embodiment;

[0023] Figure 3 is a flow chart of establishing the first optimal power and the second optimal power. DETAILED DESCRIPTION

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

[0025] See also Figure 1 , Figure 2 and Figure 3 An embodiment of the multi-power system output control device of the present invention includes a fuel cell unit 2, a lithium battery unit 3, a load unit 4, and a control unit 5.

[0026] The fuel cell unit 2 includes a fuel cell 21 and a first conversion module 22 electrically connected to the fuel cell 21 .

[0027] The lithium battery unit 3 includes a lithium battery 31 and a second conversion module 32 electrically connected to the lithium battery 31 and the first conversion module 22 .

[0028] The load unit 4 is electrically connected to the first conversion module 22 and the second conversion module 32, and is used to receive the electric energy output by the first conversion module 22 and the second conversion module 32. In this embodiment, the load unit 4 is a load system of a vehicle (not shown).

[0029] The control unit 5 is electrically connected to an external controller 9, the first conversion module 22, and the second conversion module 32. In this embodiment, the external controller 9 is a whole vehicle control system of the vehicle, and is electrically connected to the fuel cell 21 and the lithium battery 31 to monitor the operating status of the fuel cell 21 and the lithium battery 31 in real time.

[0030] The control unit 5 can execute an optimization program to establish a power optimization data table. The power optimization data table includes a plurality of power parameter sets, each of which has a power setting value, a first optimal power and a second optimal power.

[0031] In the optimization procedure, the control unit 5 establishes the power setting value, and according to each power setting value, establishes a plurality of fuel cell power setting values ​​corresponding to the fuel cell 21, and a plurality of lithium battery power setting values ​​corresponding to the lithium battery 31. To further illustrate, the power setting value is [Pdm_1Pdm_2Pdm_3…Pdm_n], a total of n setting values, the fuel cell power setting value of each power setting value is [Pfc_1Pfc_2Pfc_3…Pfc_m], a total of m setting values, and the lithium battery power setting value of each power setting value is [Pbatt_1Pbatt_2Pbatt_3…Pbatt_k], a total of k setting values, for example, the power setting value [Pdm_1Pdm_2Pdm_3…Pdm_n] of the power range of 0 to 100kW is [5kW 10kW 15kW…100kW].

[0032] Each fuel cell power setting value and the corresponding lithium battery power setting value are defined as a power combination. For example, the fuel cell power setting value [Pfc_1] and the lithium battery power setting value [Pbatt_3] are one power combination, and the fuel cell power setting value [Pfc_m] and the lithium battery power setting value [Pbatt_k] are another power combination.

[0033] The control unit 5 calculates each power combination to obtain multiple optimal energy usage combinations corresponding to the power setting values, and stores the fuel cell power setting value and the lithium battery power setting value corresponding to each optimal energy usage combination as the first optimal power and the second optimal power corresponding to the power setting value.

[0034] When calculating the optimal energy usage combination for one of the power setting values, the control unit 5 performs calculations based on the fuel cell power setting value of one of the power combinations to obtain a first efficiency parameter, and performs calculations based on the corresponding lithium battery power setting value to obtain a second efficiency parameter, and adds the first efficiency parameter and the second efficiency parameter to obtain a total efficiency parameter. After calculating all the total efficiency parameters corresponding to one of the power setting values, the control unit 5 stores the fuel cell power setting value and the lithium battery power setting value corresponding to the smallest one of the total efficiency parameters as the first optimal power and the second optimal power corresponding to the power setting value, respectively.

[0035] When calculating one of the first efficiency parameters, the control unit 5 determines whether a fuel cell voltage corresponding to the corresponding fuel cell power setting value is greater than a minimum input voltage of the first conversion module 22 based on a pre-stored fuel cell parameter table. If so, the first efficiency parameter is equal to the fuel cell power setting value divided by a first constant. If not, the first efficiency parameter is equal to the fuel cell power setting value plus a penalty value divided by the first constant.

[0036] Further explanation, the fuel cell parameter table is pre-stored in the control unit 5, which is a characteristic table of the fuel cell 21. The fuel cell parameter table has corresponding data of the use power and output voltage of the fuel cell 21, and the minimum input voltage is the minimum voltage limit of the first conversion module 22. Therefore, when the output voltage corresponding to the fuel cell power setting value is lower than the minimum voltage limit, the fuel cell power setting value is an unreasonable setting at this time, so the penalty value is added to increase the first efficiency parameter, thereby increasing the total efficiency parameter, so that it will not become the smallest one of the total efficiency parameters, thereby excluding this power combination. In this embodiment, the first constant is the battery efficiency of the fuel cell 21, which is a fixed value, and the penalty value is a large value. The ideal value of the penalty value is an infinite value, but as long as the corresponding total efficiency parameter is not the smallest one of the total efficiency parameters, it can be used.

[0037] When calculating one of the second efficiency parameters, the control unit 5 determines, based on a pre-stored lithium battery parameter table, whether a discharge depth parameter of the corresponding lithium battery power setting value after being divided by a corresponding hourly current output parameter is greater than a preset discharge value; if not, the second efficiency parameter is equal to the lithium battery power setting value divided by a second constant; if so, the second efficiency parameter is equal to the lithium battery power setting value plus the penalty value divided by the second constant.

[0038] Further explanation, the lithium battery parameter table is pre-stored in the control unit 5, which is a characteristic table of the lithium battery 31. The lithium battery parameter table has corresponding data of the power usage and hourly current output parameters of the lithium battery 31. Therefore, when the discharge depth parameter corresponding to the lithium battery power setting value is greater than the preset discharge value, it means that the lithium battery 31 is over-discharged and easily damaged. At this time, the lithium battery power setting value is an unreasonable setting, so the penalty value is added to increase the second efficiency parameter, thereby increasing the total efficiency parameter, so that it will not become the smallest one in the total efficiency parameters, thereby excluding this power combination. In this embodiment, the second constant is the battery efficiency of the lithium battery 31, and the preset discharge value is 0.8, but this is not a limiting condition.

[0039] The control unit 5 can operate among a first mode, a second mode, a third mode, a fourth mode and a fifth mode.

[0040] In the first mode, the control unit 5 controls the first conversion module 22 to draw power from the fuel cell 21 at a maximum power, so that the first conversion module 22 outputs power to the load unit 4 and the second conversion module 32, and the control unit 5 controls the second conversion module 32 to output power to the lithium battery 31 for charging. In this embodiment, the maximum power is the maximum power that the first conversion module 22 can operate the fuel cell 21, but it is not limited thereto.

[0041] In the second mode, the control unit 5 controls the first conversion module 22 to draw power from the fuel cell 21 at a first predetermined power lower than the maximum power, so that the first conversion module 22 outputs power to the load unit 4 .

[0042] In the third mode, the control unit 5 controls the first conversion module 22 to draw power from the fuel cell 21 at a preset low power, and the control unit 5 controls the second conversion module 32 to draw power from the lithium battery 31 at a second predetermined power, so that the first conversion module 22 and the second conversion module 32 jointly output power to the load unit 4. In this embodiment, the preset low power is the minimum power that the first conversion module 22 can operate the fuel cell 21, but is not limited thereto.

[0043] In the fourth mode, the control unit 5 controls the first conversion module 22 , the second conversion module 32 and the load unit 4 to stop operating.

[0044] In the fifth mode, the control unit 5 selects one of the power parameter sets as a selected power parameter set, and controls the first conversion module 22 to draw power from the fuel cell 21 at the first optimal power of the selected power parameter set, and the control unit 5 controls the second conversion module 32 to draw power from the lithium battery 31 at the second optimal power of the selected power parameter set, so that the first conversion module 22 and the second conversion module 32 jointly output power to the load unit 4. In this embodiment, the external controller 9 calculates a current power target after judging according to the current driving demand of the vehicle and notifies the control unit 5, and the control unit 5 selects one corresponding to the power target from the power parameter set as the selected power parameter set. Since the method of calculating the power target is not the main technical content of this case, it will not be further explained.

[0045] The multi-power system output control device is operated by a multi-power system output control method. The multi-power system output control method includes the following steps 61-69.

[0046] In the step 61, the power optimization data table is established by the control unit 5, and the power optimization data table has the power setting values. The control unit 5 establishes the fuel cell power setting value and the lithium battery power setting value according to each power setting value.

[0047] In step 62, the control unit 5 calculates each power combination to obtain the optimal energy usage combination corresponding to the power setting value, and stores the fuel cell power setting value and the lithium battery power setting value corresponding to each optimal energy usage combination as the first optimal power and the second optimal power corresponding to the power setting value, respectively.

[0048] In step 63 , the control unit 5 receives a fuel cell status information output by the fuel cell 21 and a lithium battery status information output by the lithium battery 31 . In this embodiment, the fuel cell status information and the lithium battery status information are transferred to the control unit 5 via the external controller 9 .

[0049] In step 64 , when the fuel cell status information shows that the fuel cell 21 is operating normally and the lithium battery status information shows that the power level of the lithium battery 31 is lower than a preset lower limit, the control unit 5 calculates a required power predetermined to be compensated by the first conversion module 22 .

[0050] In the step 65 , when the required power is not greater than the maximum power, the control unit 5 executes the first mode.

[0051] In the step 66 , when the required power is greater than the maximum power, the control unit 5 executes the second mode.

[0052] In the step 67 , when the fuel cell status information indicates that the operation of the fuel cell 21 is abnormal, the control unit 5 executes the third mode.

[0053] In the step 68 , after the control unit 5 executes the third mode, and the lithium battery status information shows that the power level of the lithium battery 31 is lower than the preset lower limit, the control unit 5 executes the fourth mode.

[0054] In the step 69 , when the fuel cell status information shows that the operation of the fuel cell 21 is normal, and the lithium battery status information shows that the power level of the lithium battery 31 is not less than the preset lower limit, the control unit 5 executes the fifth mode.

[0055] Therefore, when the control unit 5 executes the fifth mode, since the total efficiency parameters corresponding to each power setting value are the lowest values, the best efficiency can be achieved, and the fuel cell 21 and the lithium battery 31 can operate together with the lowest energy consumption to achieve the effect of saving energy. By adding the calculation of the penalty value, inappropriate power combinations can be excluded, avoiding damage to the fuel cell 21 and the lithium battery 31, and extending the service life.

[0056] In addition, when the power of the lithium battery 31 is insufficient and the fuel cell 21 is capable of supplying power greater than the required power, the control unit 5 can execute the first mode and simultaneously provide the power of the fuel cell 21 to the load unit 4 and charge the lithium battery 31, so that the load unit 4 maintains normal operation and the lithium battery 31 can be charged.

[0057] When the lithium battery 31 is insufficient and the fuel cell 21 is unable to supply power greater than the required power, the control unit 5 can execute the second mode and only provide the power of the fuel cell 21 to the load unit 4 to keep the load unit 4 operating normally.

[0058] When the fuel cell 21 is abnormal and the power of the lithium battery 31 is sufficient, the control unit 5 can execute the third mode to enable the lithium battery 31 to provide power to the load unit 4 and enable the fuel cell 21 to provide minimum power to the load unit 4, so as to keep the load unit 4 operating at a minimum level.

[0059] When the fuel cell 21 is abnormal and the power of the lithium battery 31 is insufficient, the control unit 5 can execute the fourth mode to stop the operation of the fuel cell 21 , the lithium battery 31 and the load unit 4 to ensure safety in use.

[0060] In summary, the multi-power system output control device and method of the present invention can execute different modes in response to different conditions, making power allocation more flexible, and when the control unit 5 executes the fifth mode, the fuel cell 21 and the lithium battery 31 can be used with the best efficiency through the power optimization data table, so the purpose of the present invention can be achieved.

Claims

1. A multi-power system output control device, comprising a lithium battery unit, wherein the lithium battery unit comprises a lithium battery, characterized in that: The multi-power system output control device also includes a fuel cell unit, a load unit, and a control unit. The fuel cell unit includes a fuel cell and a first conversion module electrically connected to the fuel cell. The lithium battery unit also includes a second conversion module electrically connected to the lithium battery and the first conversion module. The load unit is electrically connected to the first conversion module and the second conversion module. The load unit is used to receive the electric energy output by the first conversion module and the second conversion module. The control unit is electrically connected to the first conversion module and the second conversion module. The control unit has a built-in power optimization data table. The power optimization data table includes multiple power parameter sets, each power parameter set has a power setting value, a first optimal power and a second optimal power. The control unit can operate between a first mode, a second mode, a third mode, a fourth mode and a fifth mode. In the first mode, the control unit controls the first conversion module to draw power from the fuel cell at a maximum power so that the first conversion module outputs power to the load unit and the second conversion module. The control unit also controls the second conversion module to output power to the lithium battery for charging. In the second mode, the control unit controls the first conversion module to draw power from the fuel cell at a first predetermined power lower than the maximum power, so that the first conversion module outputs power to the load unit. In the third mode, the control unit controls the first conversion module to draw power from the fuel cell at a preset low power, and the control unit controls the second conversion module to draw power from the lithium battery at a second predetermined power, so that the first conversion module and the second conversion module jointly output power to the load unit. In the fourth mode, the control unit controls the first conversion module, the second conversion module and the load unit to stop operating. In the fifth mode, the control unit selects one of the power parameter sets as the selected power parameter set, and controls the first conversion module to draw power from the fuel cell at the first optimal power of the selected power parameter set, and the control unit controls the second conversion module to draw power from the lithium battery at the second optimal power of the selected power parameter set, so that the first conversion module and the second conversion module jointly output power to the load unit.

2. The multi-power system output control device according to claim 1, characterized in that: The control unit can execute an optimization program to establish the power optimization data table. In the optimization program, the control unit establishes the power setting value, and establishes multiple fuel cell power setting values ​​corresponding to the fuel cell and multiple lithium battery power setting values ​​corresponding to the lithium battery based on each power setting value. Each fuel cell power setting value and the corresponding lithium battery power setting value are defined as a power combination. The control unit calculates each power combination to obtain multiple optimal energy usage combinations corresponding to the power setting values, and stores the fuel cell power setting value and the lithium battery power setting value corresponding to each optimal energy usage combination as the first optimal power and the second optimal power corresponding to the power setting value, respectively.

3. The multi-power system output control device according to claim 2, characterized in that: When calculating the optimal energy usage combination for one of the power setting values, the control unit performs calculations based on the fuel cell power setting value of one of the power combinations to obtain a first efficiency parameter, and performs calculations based on the corresponding lithium battery power setting value to obtain a second efficiency parameter, and adds the first efficiency parameter and the second efficiency parameter to obtain a total efficiency parameter. After calculating all the total efficiency parameters corresponding to one of the power setting values, the control unit stores the fuel cell power setting value and the lithium battery power setting value corresponding to the smallest one of the total efficiency parameters as the first optimal power and the second optimal power corresponding to the power setting value, respectively.

4. The multi-power system output control device according to claim 3, characterized in that: When calculating one of the first efficiency parameters, the control unit determines whether the fuel cell voltage corresponding to the corresponding fuel cell power setting value is greater than the minimum input voltage of the first conversion module based on the pre-stored fuel cell parameter table. If so, the first efficiency parameter is equal to the fuel cell power setting value divided by a first constant. If not, the first efficiency parameter is equal to the fuel cell power setting value plus a penalty value divided by the first constant.

5. The multi-power system output control device according to claim 4, characterized in that: When calculating one of the second efficiency parameters, the control unit determines, based on a pre-stored lithium battery parameter table, whether a discharge depth parameter of the corresponding lithium battery power setting value after being divided by the corresponding discharge parameter is greater than a preset discharge value; if not, the second efficiency parameter is equal to the lithium battery power setting value divided by a second constant; if so, the second efficiency parameter is equal to the lithium battery power setting value plus the penalty value divided by the second constant.

6. The multi-power system output control device according to claim 1, characterized in that: The control unit receives fuel cell status information output by the fuel cell and lithium battery status information output by the lithium battery. When the fuel cell status information shows that the operation of the fuel cell is normal and the lithium battery status information shows that the power level of the lithium battery is lower than a preset lower limit, the control unit calculates the required power predetermined to be compensated by the first conversion module. When the required power is not greater than the maximum power, the control unit executes the first mode. When the required power is greater than the maximum power, the control unit executes the second mode.

7. The multi-power system output control device according to claim 1, characterized in that: The control unit receives fuel cell status information output by the fuel cell and lithium battery status information output by the lithium battery. When the fuel cell status information shows that the operation of the fuel cell is abnormal, the control unit executes the third mode. After the control unit executes the third mode, and the lithium battery status information shows that the power level of the lithium battery is lower than a preset lower limit value, the control unit executes the fourth mode.

8. The multi-power system output control device according to claim 1, characterized in that: The control unit receives fuel cell status information output by the fuel cell and lithium battery status information output by the lithium battery. When the fuel cell status information shows that the operation of the fuel cell is normal and the lithium battery status information shows that the power level of the lithium battery is not lower than a preset lower limit, the control unit executes the fifth mode.

9. A method for controlling output of a multi-power system, characterized in that: The multi-power system output control method comprises the following steps: (A) establishing a power optimization data table via a control unit, the power optimization data table including a plurality of power parameter sets, each power parameter set having a power setting value, a first optimal power, and a second optimal power, the control unit establishing a plurality of fuel cell power setting values ​​corresponding to the fuel cells and a plurality of lithium battery power setting values ​​corresponding to the lithium batteries according to each power setting value, defining each fuel cell power setting value and the corresponding lithium battery power setting value as a power combination, the control unit calculating each power combination to obtain a plurality of optimal energy usage combinations corresponding to the power setting values, and storing the fuel cell power setting value and the lithium battery power setting value corresponding to each optimal energy usage combination as the first optimal power and the second optimal power corresponding to the power setting value, respectively; (B) the control unit executes a first mode, in which the control unit controls a first conversion module electrically connected to the fuel cell to draw power from the fuel cell at a maximum power, so that the first conversion module outputs power to a load unit and a second conversion module electrically connected to the lithium battery, and the control unit controls the second conversion module to output power to the lithium battery for charging; (C) the control unit executes a second mode, in which the control unit controls the first conversion module to draw power from the fuel cell at a first predetermined power lower than the maximum power, so that the first conversion module outputs power to the load unit; (D) the control unit executes a third mode, in which the control unit controls the first conversion module to draw power from the fuel cell at a preset low power, and the control unit controls the second conversion module to draw power from the lithium battery at a second predetermined power, so that the first conversion module and the second conversion module jointly output power to the load unit; (E) the control unit executes a fourth mode, in which the control unit controls the first conversion module, the second conversion module and the load unit to stop operating; and (F) The control unit executes a fifth mode. In the fifth mode, the control unit selects one of the power parameter sets as a selected power parameter set, and controls the first conversion module to draw power from the fuel cell at the first optimal power of the selected power parameter set. The control unit also controls the second conversion module to draw power from the lithium battery at the second optimal power of the selected power parameter set, so that the first conversion module and the second conversion module jointly output power to the load unit.

10. The multi-power system output control method according to claim 9, characterized in that: When calculating the optimal energy usage combination for one of the power setting values, the control unit performs calculations based on the fuel cell power setting value of one of the power combinations to obtain a first efficiency parameter, and performs calculations based on the corresponding lithium battery power setting value to obtain a second efficiency parameter, and adds the first efficiency parameter and the second efficiency parameter to obtain a total efficiency parameter. After calculating all the total efficiency parameters corresponding to one of the power setting values, the control unit stores the fuel cell power setting value and the lithium battery power setting value corresponding to the smallest one of the total efficiency parameters as the first optimal power and the second optimal power corresponding to the power setting value, respectively.

11. The multi-power system output control method according to claim 10, characterized in that: When calculating one of the first efficiency parameters, the control unit determines whether the fuel cell voltage corresponding to the corresponding fuel cell power setting value is greater than the minimum input voltage of the first conversion module based on the pre-stored fuel cell parameter table. If so, the first efficiency parameter is equal to the fuel cell power setting value divided by a first constant. If not, the first efficiency parameter is equal to the fuel cell power setting value plus a penalty value divided by the first constant.

12. The multi-power system output control method according to claim 11, characterized in that: When calculating one of the second efficiency parameters, the control unit determines whether the discharge depth parameter of the corresponding lithium battery power setting value after being divided by the corresponding discharge parameter is greater than the preset discharge value according to the pre-stored lithium battery parameter table. If not, the second efficiency parameter is equal to the lithium battery power setting value divided by the second constant. If so, the second efficiency parameter is equal to the lithium battery power setting value plus the penalty value divided by the second constant.

13. The multi-power system output control method according to claim 9, characterized in that: The method further includes steps (G) and (H). In step (G), the control unit receives fuel cell status information output by the fuel cell and lithium battery status information output by the lithium battery. In step (H), when the fuel cell status information shows that the operation of the fuel cell is normal and the lithium battery status information shows that the power level of the lithium battery is lower than a preset lower limit, the control unit calculates the required power predetermined to be compensated by the first conversion module. When the required power is not greater than the maximum power, the control unit executes step (B). When the required power is greater than the maximum power, the control unit executes step (C).

14. The multi-power system output control method according to claim 9, characterized in that: The method further includes a step (G), in which the control unit receives fuel cell status information output by the fuel cell and lithium battery status information output by the lithium battery. When the fuel cell status information shows that the operation of the fuel cell is abnormal, the control unit executes the step (D). After the control unit executes the third mode, and the lithium battery status information shows that the power level of the lithium battery is lower than a preset lower limit value, the control unit executes the step (E).

15. The multi-power system output control method according to claim 9, characterized in that: The method further includes a step (G), in which the control unit receives fuel cell status information output by the fuel cell and lithium battery status information output by the lithium battery. When the fuel cell status information shows that the operation of the fuel cell is normal and the lithium battery status information shows that the power level of the lithium battery is not less than a preset lower limit value, the control unit executes the step (F).

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