Generator set hybrid power system

Abstract

The invention provides a generator set hybrid power system which comprises an engine, an inverter, a battery and a bidirectional module, and the bidirectional module is connected with the inverter, the battery and the engine. Current detectors are arranged at the battery end of the voltage reduction charging channel and the battery end of the voltage boosting discharging channel of the bidirectional module and are used for detecting a discharging current signal and a charging current signal; a diode is arranged at the discharge end of the boost discharge channel of the bidirectional module, and voltage monitors are arranged at the two ends of the diode and used for detecting voltage difference signals of the diode; when the voltage drop of the diode is detected, the battery is in a discharge state; when it is detected that no voltage drop exists in the diode, it shows that the battery is in a non-discharge state and the generator is in a working state; at the moment, whether the battery is in a charging state is further judged through current detection of the step-down charging channel. According to the invention, the generator set can be awakened to charge the battery under the condition that the generator set does not work; and the charging and discharging states of the battery can be effectively monitored and controlled.

Description

Technical Field

[0001] The present invention relates to the field of generator power, and in particular to a hybrid power system of a generator set. Background Art

[0002] The traditional method can only charge the battery when the generator set is working, and it is impossible to effectively monitor and control the battery's charge and discharge status. This may have the following disadvantages: the battery cannot be charged when the generator set is not working, which limits the flexibility of charging. The inability to monitor the battery status may cause the reliability of the generator set to decrease, and there may be a situation where the generator set cannot be started; in addition, when the traditional generator set is working, the battery is always in a charging state, and the battery is overcharged; because it is impossible to optimize the charging according to the actual state of the battery, the battery is overcharged or over-discharged, which will accelerate the aging of the battery. Summary of the invention

[0003] The present invention aims to at least solve the technical problems existing in the prior art, and in particular innovatively proposes a hybrid power system of a generator set.

[0004] In order to achieve the above-mentioned object of the present invention, the present invention provides a hybrid power system of a generator set, comprising: an engine, an inverter, a battery, and a bidirectional module, wherein the bidirectional module is connected to the inverter, the battery, and the engine respectively; the engine includes a magnetic motor;

[0005] A voltage detection is set at the low-voltage battery end of the bidirectional module to detect the voltage at the battery end. When the voltage at the low-voltage battery end of the bidirectional module is higher than the set full-charge threshold, it is determined that the battery power is sufficient;

[0006] The bidirectional module includes a buck charging channel and a boost discharging channel, and monitoring elements are provided at both ends of the buck charging channel and the boost discharging channel. The connection includes:

[0007] A diode is provided at the high-voltage end of the boost discharge channel of the bidirectional module, and the high-voltage end of the boost discharge channel of the bidirectional module is connected to the anode of the diode, and the anode voltage of the diode is U1 relative to the ground; the cathode of the diode is connected to the inverter, the engine, and the high-voltage end of the step-down charging channel of the bidirectional module, and the cathode voltage of the diode is U0 relative to the ground; in addition, voltage detection is provided at both ends of the diode to detect the voltage difference signal u of the diode, u=U1-U0, when u is greater than 0, it indicates that the engine is not working and the generator set is in a non-operating state; when u is less than or equal to 0, it indicates that the engine is working and the generator set is in an operating state;

[0008] A current detection is set at the low voltage end of the boost discharge channel of the bidirectional module to confirm whether the boost discharge channel is really in the open state; a current detection is set at the low voltage end of the buck charging channel of the bidirectional module to confirm whether the buck charging channel is really in the open state;

[0009] The bidirectional module can control the closing and opening of the buck charging channel and the boost discharging channel according to the voltage conditions at the battery end:

[0010] (1) When the battery is fully charged and the generator set is not running, the boost discharge channel is opened and the buck charging channel is closed; the battery is in an independent discharge state, which can avoid self-consumption of power.

[0011] (2) When the battery voltage is lower than the charging threshold, the bidirectional module closes the boost discharge channel and opens the buck charging channel; at this time, the battery is in the charging state;

[0012] (3) When the battery is fully charged and the generator set is running, the boost discharge channel and the buck charge channel are opened at the same time to realize the battery charging and discharging at the same time. At this time, the battery is in the charging state and the discharging state at the same time;

[0013] (4) When the generator set is not running and the inverter is not outputting current, both the boost channel and the buck charging channel are closed; whether the inverter outputs current is determined by current detection set at the low-voltage end of the buck charging channel.

[0014] Through the above settings, the bidirectional module can open and close the boost discharge channel and the buck charging channel according to actual conditions, so that the generator set hybrid system can achieve a mixed output of the battery and the generator set. That is to say, the generator set and the battery can output power separately, can output power at the same time, or can automatically control the start and stop of the generator set according to the battery power status.

[0015] In a preferred embodiment of the present invention, the boost discharge channel and the buck charge channel of the bidirectional module are in an open state by default.

[0016] In a preferred embodiment of the present invention, it also includes a start-stop control module, which is respectively connected to the bidirectional module and the engine, and is used to start and stop the engine; the battery provides direct current to the start control module through the bidirectional module, and the bidirectional module has a boost function, which can increase the battery voltage to the starting voltage of the engine.

[0017] When the battery is fully charged, the boost discharge channel is open, and the buck charging channel is closed, the bidirectional module sends a signal to the start-stop module to control the engine to stop, thereby stopping the generator set;

[0018] When the battery voltage is lower than the charging threshold, the bidirectional module closes the boost discharge channel and opens the buck charging channel. The bidirectional module sends a signal to the start-stop module to control the engine to start, thereby starting the generator set.

[0019] By setting up the start-stop control module, the bidirectional module can send signals to the external start-stop module according to the battery voltage to control the start and stop of the engine.

[0020] In a preferred embodiment of the present invention, in addition to starting the engine by the start-stop control module, the engine can also be started by a reverse drag start method.

[0021] In a preferred embodiment of the present invention, when the battery is in a discharging state, the output current of the battery is boosted through a bidirectional module boost discharge channel, and then inverted and rectified through an inverter, and the current output by the inverter is used to power the load.

[0022] In summary, due to the adoption of the above technical solutions, the bidirectional module designed by the present invention and the generator set hybrid power system in which it is located have significantly improved the overall performance of the system through the advantages of intelligent charge and discharge management, generator set wake-up and auxiliary power supply, charge and discharge function, and operation convenience and flexibility, providing users with a more efficient, stable and reliable power supply solution. The specific advantages are as follows:

[0023] (1) Enhanced charging flexibility: The present invention can realize battery charging through intelligent control when the generator set is not working, breaking the limitation of the traditional method that charging is only limited to when the generator set is working, and significantly improving the charging flexibility.

[0024] (2) Improving system reliability: By real-time monitoring of the battery status and intelligently controlling the charging and discharging channels, the present invention ensures the normal start-up of the generator set and avoids the problem of reduced reliability due to unknown battery status.

[0025] (3) Optimizing battery management: The present invention can perform intelligent charge and discharge control according to the actual state of the battery, effectively avoiding overcharging and overdischarging of the battery, thereby significantly extending the battery life and slowing down the aging of the battery.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1It is a circuit diagram of the hybrid power system of the generator set of the present invention. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] Figure 1 Schematic diagram of the hybrid power system of the generator set of the present invention. Figure 1 It can be seen that the generator set hybrid system includes a magneto, an inverter, a battery, a bidirectional module and an automatic charging button, among which the magneto belongs to the engine;

[0031] The bidirectional module includes a boost module (boost discharge channel) and a buck module (buck charging channel), a current detection module, a voltage detection module, an isolation control module, an isolation communication module, and a single-chip voltage detection control module (i.e., a voltage detection set at the low-voltage battery end of the bidirectional module);

[0032] The boost module and the buck module each include a voltage isolation converter, and are respectively connected in series with a current detection module; the current detection module is connected to the battery and is used to confirm whether the voltage isolation converter (boost discharge channel) of the boost module and the voltage isolation converter (buck charging channel) of the buck module are turned on.

[0033] The voltage detection module is used to detect the voltage across the diode, wherein the anode of the diode is connected to the voltage isolation converter of the boost module, and the anode voltage of the diode is U1 relative to the ground; the cathode of the diode is connected to the inverter, and the cathode voltage of the diode is U0 relative to the ground; the voltage difference signal of the diode u=U1-U0, when u is greater than 0, it indicates that the engine is not working and the generator set is not in operation; when u is less than or equal to 0, it indicates that the engine is working and the generator set is in operation. That is: if the voltage detection module detects that there is a voltage drop in the diode, it means that the battery is in a discharging state; at this time, current detection can be used to further confirm whether it is discharging; the purpose of this is to prevent the influence of the voltage drop caused by signal interference or the reverse charging voltage. If there is no voltage drop in the diode, it means that the battery is in a non-discharging state and the generator is in a working state; at this time, the current detection module can be used to further determine whether the battery is in a charging state:

[0034] The single-chip computer voltage detection control module is connected to the positive pole of the battery to detect the voltage at the battery end and determine whether the battery voltage is higher than the set threshold. If the battery voltage is higher than the set threshold, it means that the battery power is sufficient, and the single-chip computer voltage detection control module sends a control signal to stop the magneto (engine); if the battery voltage is lower than the set threshold, it means that the battery power is low, and the generator continues to maintain the current working state and performs battery charging operations. In addition, the isolation control module of the bidirectional module can also collect the electrical signal (trigger signal and magneto signal) of the magneto, so as to accurately determine whether the magneto (generator) is in working state.

[0035] The bidirectional module can control the closing and opening of the voltage isolation converter of the buck module (buck charging channel) and the voltage isolation converter of the boost module (boost discharge channel) according to the voltage conditions at the battery end:

[0036] (1) When the battery is fully charged and the generator set is not running, the voltage isolation converter of the boost module starts and the voltage isolation converter of the buck module stops running; the battery is in a discharged state; the bidirectional module sends a signal to the start-stop module to control the engine to stop, thereby stopping the generator set;

[0037] (2) When the battery voltage is lower than the charging threshold, the bidirectional module turns off the voltage isolation converter of the boost module and turns on the voltage isolation converter of the buck module; at this time, the battery is in a charging state; the bidirectional module sends a signal to the start-stop module to control the engine to start, thereby starting the generator set.

[0038] (3) When the battery is fully charged and the generator set is running, the voltage isolation converter of the boost module and the voltage isolation converter of the buck module are turned on at the same time to realize charging and discharging of the battery. At this time, the battery is in the charging state and discharging state at the same time;

[0039] (4) When the generator set is not running and the inverter is not outputting current, the voltage isolation converters of the boost channel and the buck module are both turned off; whether the inverter outputs current is determined by current detection set at the low-voltage end of the voltage isolation converter of the buck module.

[0040] When the battery is in a discharging state, the output current of the battery is boosted by the voltage isolation converter of the bidirectional module boost module, and then inverted and rectified by the inverter. The current output by the inverter is used to power the load.

[0041] The isolation control module is connected to the single-chip voltage detection control module and the magneto respectively; the isolation control module is used to receive the signal from the single-chip voltage detection control module and then control the operation of the engine.

[0042] The isolation communication module is connected to the single-chip computer voltage detection control module and the voltage detection module respectively; the isolation communication module determines the battery discharge condition using the measured voltage and sends the result to the single-chip computer voltage detection control module.

[0043] The automatic charging button is connected to the single-chip computer voltage detection control module, and the automatic charging button is used to control the start and stop of the single-chip computer voltage detection control module (that is, the voltage detection set at the low-voltage battery end of the bidirectional module).

[0044] The bidirectional module designed in the present invention has two functions: (1) The bidirectional module connects the battery and the inverter together. When the generator is not in operation, the battery can directly supply power to the load through the inverter. At this time, the battery discharges independently. (2) The bidirectional module connects the battery and the generator together. The generator can be automatically started and stopped according to the battery power level, thereby realizing automatic charge and discharge control of the battery. When the generator is in operation, the battery and the generator discharge together. If the battery is insufficient, the battery charging operation is performed.

[0045] In general working scenarios, (1) if the battery voltage is lower than 30% and the magneto (engine) is not working, the microcontroller sends a control signal to the magneto (engine) to start it; at this time, the generator set is in working condition and the battery is in charging condition until the battery is fully charged; when the battery is fully charged, if there is no discharge current from the external load, the engine is stopped. There are two main ways to start the engine with a battery. One is through the start-stop control module, which is set between the battery and the bidirectional module; the other is reverse start, which replaces the isolation control module in the bidirectional module with the reverse start module. (2) If the battery voltage is lower than 30% and the magneto (engine) is working, it does not move at this time; the engine remains in working condition. (3) If the engine stops working due to a fault, the microcontroller sends a signal and the engine works; until the battery is fully charged, the microcontroller sends a signal to stop the engine.

[0046] In short, the voltage detection module that detects the diode voltage drop and the two current detection modules at the charging and discharging ends can determine the battery charging and discharging status; then the microcontroller controls the generator according to the charging and discharging status. When the battery is low / no power, the charging operation is performed; when the battery is fully charged and there is no load, the generator set is shut down.

[0047] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A hybrid power system of a generator set, characterized in that: include: An engine, an inverter, a battery, and a bidirectional module, wherein the bidirectional module is connected to the inverter, the battery, and the engine respectively; A voltage detection is set at the low-voltage battery end of the bidirectional module to detect the voltage at the battery end. When the voltage at the low-voltage battery end of the bidirectional module is higher than the set full-charge threshold, it is determined that the battery power is sufficient; The bidirectional module includes a buck charging channel and a boost discharging channel, and monitoring elements are provided at both ends of the buck charging channel and the boost discharging channel. The connection includes: A diode is provided at the high-voltage end of the boost discharge channel of the bidirectional module, and the high-voltage end of the boost discharge channel of the bidirectional module is connected to the anode of the diode, and the anode voltage of the diode is U1 relative to the ground; the cathode of the diode is connected to the inverter, and the cathode voltage of the diode is U0 relative to the ground; in addition, voltage detection is provided at both ends of the diode to detect the voltage difference signal u of the diode, u=U1-U0, when u is greater than 0, it indicates that the engine is not working and the generator set is in a non-operating state; when u is less than or equal to 0, it indicates that the engine is working and the generator set is in an operating state; A current detection is set at the low voltage end of the boost discharge channel of the bidirectional module, and a current detection is set at the low voltage end of the buck charging channel of the bidirectional module; The bidirectional module can control the closing and opening of the buck charging channel and the boost discharging channel according to the voltage at the battery end: (1) When the battery is fully charged and the generator set is not running, the boost discharge channel is open and the buck charging channel is closed; the battery is in a discharge state; (2) When the battery voltage is lower than the charging threshold, the bidirectional module closes the boost discharge channel and opens the buck charging channel; at this time, the battery is in the charging state; (3) When the battery is fully charged and the generator set is running, the boost discharge channel and the buck charge channel are opened at the same time to realize the battery charging and discharging at the same time. At this time, the battery is in the charging state and the discharging state at the same time; (4) When the generator set is not running and the inverter is not outputting current, both the boost channel and the buck charging channel are closed; whether the inverter outputs current is determined by current detection set at the low-voltage end of the buck charging channel.

2. A hybrid power system of a generator set according to claim 1, characterized in that: The boost discharge channel and buck charge channel of the bidirectional module are open by default.

3. A generator set hybrid power system according to claim 1, characterized in that: Also included is a start-stop control module, which is connected to the bidirectional module and the engine, respectively, and is used to start and stop the engine; When the battery is fully charged, the boost discharge channel is open, and the buck charging channel is closed, the bidirectional module sends a signal to the start-stop module to control the engine to stop, thereby stopping the generator set; When the battery voltage is lower than the charging threshold, the bidirectional module closes the boost discharge channel and opens the buck charging channel. The bidirectional module sends a signal to the start-stop module to control the engine to start, thereby starting the generator set.

4. A hybrid power system of a generator set according to claim 3, characterized in that: In addition to starting the engine through the start-stop control module, the engine can also be started by reverse starting.

5. A generator set hybrid power system according to claim 1, characterized in that: When the battery is in a discharging state, the output current of the battery is boosted through the bidirectional module boost discharge channel, and then inverted and rectified through the inverter. The current output by the inverter is used to power the load.

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