Oil engine energy storage hybrid power system

Abstract

The utility model provides an oil engine energy storage hybrid power system which comprises an isolation DC-DC conversion module, a BUCK-BOOST conversion module, a main control module, a rectification circuit and a bidirectional inverter. The battery is connected with the primary bus after passing through the isolation DC-DC conversion module, and the primary bus is connected with the secondary bus after passing through the BUCK-BOOST conversion module; the oil engine is connected to the secondary bus after passing through the rectifier module; the secondary bus is connected with commercial power or a load through the inversion module, receives commercial power supply or supplies power to the load; the main control module comprises a signal acquisition unit for acquiring the electric quantity, voltage and current information of the battery, and acquiring the voltage of a primary bus, the voltage of a secondary bus and the current of an oil engine; and the driving control module is used for carrying out driving control on the isolation DC-DC conversion module, the BUCK-BOOST conversion module and the bidirectional inverter. According to the system, the oil engine and the portable power supply are integrated and share the direct-current bus, so that the problems of noisy noise, heavy pollution, poor dynamic state and long service time of a battery during long-time working of the oil engine can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to hybrid system technical field especially relates to a oil machine energy storage hybrid system. BACKGROUND

[0002] At present, the most popular two kinds of power generation equipment are portable power supply and diesel / gasoline generator (hereinafter referred to as oil machine), but both have advantages and disadvantages: portable power supply is quiet and pollution-free, but the source of energy is battery, and the battery needs to be charged and cannot be used when the battery is used up, and the use time is limited each time; the energy of oil machine is taken from gasoline or diesel, and oil can be added immediately when the oil is used up, so the use time can not be limited, but the pollution and noise of oil machine are very large, and the comfort of use is far inferior to portable power supply, and the dynamic effect of oil machine is poor, and the oil car is easy to protect when the load is suddenly added. INVENTION CONTENTS

[0003] The utility model aims at providing a oil machine energy storage hybrid system, which integrates oil machine and portable power supply into one, to solve the problems of long-time oil machine work noise, pollution, poor dynamic and battery use time.

[0004] The specific technical scheme is:

[0005] A kind of oil machine energy storage hybrid system, including isolation DC-DC conversion module, BUCK-BOOST conversion module, main control module, rectifier circuit and bidirectional inverter;

[0006] Battery is connected with primary bus after passing through isolation DC-DC conversion module, and primary bus is connected with secondary bus after passing through BUCK-BOOST conversion module;

[0007] The oil machine is connected with secondary bus after passing through rectifier module;

[0008] Secondary bus is connected with commercial power or load through inverter module, accepts commercial power supply, or supplies power to load;

[0009] The main control module includes or connects a signal acquisition unit, and the signal acquisition unit is used to acquire the battery capacity, voltage, current information, the voltage of primary bus, the voltage of secondary bus and oil machine current;The main control module drives and control isolation DC-DC conversion module, BUCK-BOOST conversion module and bidirectional inverter through three groups of control signals respectively.

[0010] Further, the isolation DC-DC conversion module adopts phase-shift full-bridge conversion circuit or full-bridge LLC conversion circuit.

[0011] Further, the BUCK-BOOST conversion module adopts double-switch BUCK-BOOST conversion circuit.

[0012] Further, the bidirectional inverter adopts an H4 topology bidirectional inverter.

[0013] Further, the rectifier module adopts a bridge rectifier circuit.

[0014] Further, the main control module is connected with the oil engine through an RS485 bus.

[0015] The oil engine energy storage hybrid system of the utility model integrates oil engine and portable power supply into one, and shares a DC bus, which can solve the problems of long-time oil engine work noise, pollution, dynamic difference and battery use time. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the communication connection block diagram of the oil engine energy storage hybrid system of the utility model;

[0017] Figure 2 is the signal connection block diagram of the oil engine energy storage hybrid system of the utility model;

[0018] Figure 3 is the circuit principle diagram of one embodiment of the oil engine energy storage hybrid system of the utility model. DETAILED DESCRIPTION

[0019] To further illustrate the embodiments, the utility model provides drawings. These drawings are part of the utility model disclosure, which mainly serves to illustrate the embodiments, and can explain the operation principle of the embodiments in cooperation with the related description of the specification. With reference to these contents, those skilled in the art should understand other possible embodiments and advantages of the utility model. The components in the drawings are not drawn according to scale, and similar component symbols are usually used to represent similar components.

[0020] The utility model will be further illustrated in combination with the drawings and specific embodiments.

[0021] As Figure 1 , Figure 2 , Figure 3As shown, the utility model discloses an oil engine energy storage hybrid system, by isolation DC-DC conversion module 10, BUCK-BOOST conversion module 20, main control module 50, rectifier module 30 and bidirectional inverter 40 etc. composition. The battery 60 is connected with the first bus VBUS1 after passing through the isolation DC-DC conversion module, and the first bus VBUS1 is connected with the second bus VBUS2 after passing through the BUCK-BOOST conversion module 20;The oil engine 70 is connected with the second bus VBUS2 after passing through the rectifier module 30;The second bus VBUS2 is connected with the commercial power or load through the bidirectional inverter 40, accepts the commercial power supply, or supplies the load. The main control module 50 includes or connects a signal acquisition unit 80, the signal acquisition unit 80 is connected with the battery 60, and the battery 60 is connected with the first bus VBUS1, the second bus VBUS2, the signal acquisition unit 80 is connected with the first bus VBUS1, the second bus VBUS2, and the voltage of the first bus VBUS1 and the voltage of the second bus VBUS2 are collected, and the output of the rectifier module 30 is connected, and the output current (i.e. engine current) of the oil engine 70 is collected;And drive control is carried out to isolation DC-DC conversion module 10, BUCK-BOOST conversion module 20 and bidirectional inverter 40 through three groups of control signals respectively. Specific drive control belongs to the conventional technical means of the prior art, which will not be described here.

[0022] The oil engine energy storage hybrid system of the utility model adopts common DC bus, and the oil engine directly charges the battery in direct current when starting, reducing the two-stage topology of oil engine inversion and charging rectification. The specific working principle is as follows:

[0023] (1) when the battery capacity is sufficient: if the external power supply is required, the voltage of the second bus VBUS2 is raised to a higher voltage by the battery 60 after passing through the isolation DC-DC conversion module 10 and the BUCK-BOOST conversion module 20, and then the load is output through the bidirectional inverter 40, and the main control module 50 does not start the oil engine 70 through the RS485 bus control instruction, and keeps the quiet use environment.

[0024] (2) when the battery energy is insufficient: if the external power supply is required, the main control module 50 issues control instructions through the RS485 bus, and the oil engine 70 is started;The oil engine 70 is powered after passing through the rectifier module 30, and then the load is powered through the bidirectional inverter 40. When the load is less than the power of the oil engine, the oil engine works with large waste, and the running noise is large, at this time, the voltage of the second bus VBUS2 is raised, which is higher than the voltage of the first bus VBUS1, and the battery 60 is charged through the BUCK-BOOST conversion module 20 and the isolation DC-DC conversion module 10, and the energy efficiency of the oil engine 70 is improved. When the battery 60 is charged to a certain capacity (such as 60% to 80%), the oil engine 70 is closed, and the use time of the oil engine 70 is reduced.

[0025] (3) When the external load is large, the battery 60 is connected in parallel with the oil engine through the DC-DC conversion module 10 and the BUCK-BOOST conversion module 20, and supplies power to the load through the bidirectional inverter 40, thereby increasing the load capacity of the entire system.

[0026] (4) When the external load is suddenly increased, if the oil engine directly bears the load, the oil engine protection is easy to occur, and the voltage of the secondary bus VBUS2 will decrease. At this time, the voltage of the secondary bus VBUS2 is stabilized by the battery 60 through the DC-DC conversion module 10 and the BUCK-BOOST conversion module 20. The battery 60 provides energy for a short time, and then slowly reduces the energy of the battery 60, so that the oil engine 70 is not impacted, and the stable operation of the entire system is ensured.

[0027] In the embodiment, the isolation DC-DC conversion module 10 can adopt two schemes of phase-shifted full-bridge and full-bridge LLC, or other isolation protection schemes, to provide isolation protection for charging and discharging of the battery.

[0028] The phase-shifted full-bridge is a power conversion module structure composed of two half-bridges, each of which includes two switching tubes and a diode. The phase-shifted full-bridge realizes voltage conversion and power regulation by controlling the on-off of the switching tubes (such as MOS, IGBT, etc.). The core principle is to control the switching action of the half-bridge by introducing a delay or a phase shift angle, so as to realize zero voltage switching (ZVS) or zero current switching (ZCS) operation. The phase-shifted full-bridge has the characteristics of high efficiency, low switching loss and small electromagnetic interference.

[0029] The full-bridge LLC is a series resonant type power conversion module, also composed of two half-bridges. However, unlike the phase-shifted full-bridge, the full-bridge LLC adds a resonant inductor and a resonant capacitor at the output end. The working principle of the full-bridge LLC is to realize high-efficiency energy conversion by controlling the on-off of the switching tubes and the resonance of the resonant inductor and the resonant capacitor. It uses the LLC resonant topology structure, which can realize zero voltage switching (ZVS) operation when the resonant frequency is matched, thereby reducing switching loss and electromagnetic interference.

[0030] The BUCK-BOOST conversion module 20 is a commonly used DC / DC conversion circuit, whose output voltage can be lower or higher than the input voltage. In the embodiment, a typical double-switch BUCK-BOOST conversion circuit is given, which is composed of an inductor L2 and switching tubes Q11 and Q12, and the circuit is simple and convenient to control. In specific applications, four-switch BUCK-BOOST conversion circuits and other BUCK-BOOST conversion circuits can also be used.

[0031] In the embodiment, the external power supply is single-phase power. Therefore, preferably, the bidirectional inverter 40 can adopt a bidirectional inverter of H4 topology, i.e., a full-bridge inverter, which is composed of switching tubes Q9, Q10, Q15, Q16, etc., as shown in Figure 3 .

[0032] In the embodiment, the rectifier module preferably adopts a full-bridge rectifier circuit to provide high-efficiency output, as shown in Figure 3 , which is composed of switching tubes Q1, Q2, Q3, Q4, etc.

[0033] In summary, the oil engine energy storage hybrid system of the utility model integrates the oil engine and the portable power supply into one and shares a DC bus, which can solve the problems of long-time oil engine work noise, high pollution, poor dynamic performance, and battery use time.

[0034] Although the utility model is specifically shown and introduced in combination with the preferred embodiments, those skilled in the art should understand that various changes can be made to the utility model in form and details without departing from the spirit and scope of the utility model defined by the appended claims, and all of them are within the protection scope of the utility model.

Claims

1. An oil engine energy storage hybrid system, characterized by: The system comprises an isolated DC-DC conversion module, a BUCK-BOOST conversion module, a main control module, a rectifier circuit and a bidirectional inverter. The battery is connected to a primary bus through the isolated DC-DC conversion module, and the primary bus is connected to a secondary bus through the BUCK-BOOST conversion module. The oil machine is connected to the secondary bus through the rectifier module. The secondary bus is connected to the mains or the load through the inverter module, and receives power supply from the mains or supplies power to the load. The main control module comprises or is connected to a signal acquisition unit, which is used to acquire the power, voltage and current information of the battery, the voltage of the primary bus, the voltage of the secondary bus and the current of the oil machine; the main control module drives and controls the isolated DC-DC conversion module, the BUCK-BOOST conversion module and the bidirectional inverter through three groups of control signals respectively.

2. The oil engine energy storage hybrid system of claim 1, wherein: The isolated DC-DC conversion module adopts a phase-shifted full-bridge conversion circuit or a full-bridge LLC conversion circuit.

3. The oil engine energy storage hybrid system of claim 1, wherein: The BUCK-BOOST conversion module adopts a double-switch BUCK-BOOST conversion circuit.

4. The oil engine energy storage hybrid system of claim 1, wherein: The bidirectional inverter adopts an H4 topology bidirectional inverter.

5. The oil engine energy storage hybrid system of claim 1, wherein: The rectifier module adopts a bridge rectifier circuit.

6. The oil engine energy storage hybrid system of claim 1, wherein: The main control module is in communication connection with the oil machine through an RS485 bus.

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