CN106870236A - A kind of digital electricity generating system unit starting accumulator plant - Google Patents
A kind of digital electricity generating system unit starting accumulator plant Download PDFInfo
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- CN106870236A CN106870236A CN201710251327.XA CN201710251327A CN106870236A CN 106870236 A CN106870236 A CN 106870236A CN 201710251327 A CN201710251327 A CN 201710251327A CN 106870236 A CN106870236 A CN 106870236A
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- 238000001514 detection method Methods 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 description 18
- 238000010586 diagram Methods 0.000 description 14
- 238000005516 engineering process Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/04—Starting of engines by means of electric motors the motors being associated with current generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/06—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits or control means specially adapted for starting of engines
- F02N11/0848—Circuits or control means specially adapted for starting of engines with means for detecting successful engine start, e.g. to stop starter actuation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits or control means specially adapted for starting of engines
- F02N11/0862—Circuits or control means specially adapted for starting of engines characterised by the electrical power supply means, e.g. battery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a kind of digital electricity generating system unit starting accumulator plant, when digital electricity generating system starts, the control method of unit starting accumulator plant comprises the following steps：S1A), unit starting accumulator plant is to generator powered；S2A), generator is controlled to drag internal combustion engine start by machine-side converter；S3A), DC voltage rises as generator speed increases；S4A), judge DC voltage whether higher than unit starting accumulator plant battery tension, if it is, into step S5A), if it is not, being back to step S1A)；S5A), unit starting accumulator plant stops to generator powered；Digital electricity generating system realizes and internal combustion engine is directly initiated, and saves the startup electric machine in conventional art, effectively reduces the volume and cost of digital electricity generating system, and unit starting accumulator plant control method is simple and convenient, it is easy to accomplish.
Description
Technical Field
The invention relates to the field of digital generators, in particular to a unit starting storage battery device for a digital generator system.
Background
The digital generator drags the generator through an internal combustion engine (such as a gasoline engine and a diesel engine) and then outputs alternating current meeting the load voltage requirements (including voltage amplitude, frequency, harmonic distortion rate and the like) through power electronic conversion. Because the generator has high operating frequency and adopts a digital control technology, the digital generator has the advantages of small volume, light weight, flexible use and the like, and is widely applied to emergency standby power supplies, remote or temporary power supplies and the like.
However, the internal combustion engine as the prime mover has no self-starting capability, and the conventional digital generator system needs to adopt a special starting motor device to realize the unit starting, so that the digital generator system is large in system and high in cost.
In addition, the traditional digital generator adopts a thyristor rectifier of a semi-controlled device or a diode rectifying and DC/DC converter of an uncontrolled device to control the output direct-current voltage of the generator, and has the defects of low power factor, large harmonic wave, poor dynamic performance, incapability of realizing the tracking operation control of the optimal efficiency of the internal combustion engine and the like.
Therefore, a digital generator system is required to solve the above technical problems.
Disclosure of Invention
In view of the above, the present invention provides a unit starting storage battery device for a digital generator system, in which the digital generator system realizes direct starting of an internal combustion engine, a starting motor device in the conventional technology is omitted, the volume and the cost of the digital generator system are effectively reduced, and a control method for the unit starting storage battery device is simple and convenient and is easy to implement.
The technical scheme adopted by the invention is as follows:
a kind of digital generator system starts the storage battery apparatus with the unit, the said digital generator system includes internal-combustion engine, generator, direct-flow bus, inverter connected sequentially, the said digital generator system realizes the control through MCU controller, connect the machine side converter between said generator and direct-flow bus, the said machine side converter adopts PWM power converter of the all-controlled type device, the said direct-flow bus connects the unit in parallel and starts the storage battery apparatus, the said unit starts the storage battery apparatus and supplies power for the generator when the digital generator system starts, the said MCU controller controls the part of the digital generator system through the control method according to the measured signal; wherein,
when the digital generator system is started, the control method for starting the storage battery device by the unit comprises the following steps:
S1A), the unit starts the storage battery device to supply power to the generator;
S2A), controlling a generator to drag the internal combustion engine to start through a machine side converter;
S3A), the direct current voltage rises along with the increase of the rotating speed of the generator;
S4A), judging whether the direct current voltage is higher than the battery voltage of the unit starting battery device, if so, going to step S5A), and if not, returning to step S1A);
S5A), the unit starts the storage battery device to stop supplying power to the generator, and the digital generator system enters a normal power generation working mode after the start is finished.
Preferably, when the digital generator system is in a normal power generation operating mode, the control method for starting the storage battery device by the unit comprises the following steps:
S1B), detecting the battery voltage of the battery starting device of the unit;
S2B), judging whether the voltage of the storage battery in the step S1B) is lower than the preset threshold value, if yes, going to the step S3B), and if not, returning to the step S1B);
S3B), the direct current bus charges and stores energy for the unit starting storage battery device;
S4B), judging whether the battery voltage of the step S3B) reaches the rated battery voltage, if yes, going to step S5B), if not, returning to step S3B);
S5B), the direct current bus stops charging and storing energy for the unit starting storage battery device.
Preferably, the predetermined threshold value of the battery voltage is 85-98% of the rated battery voltage.
Preferably, the rated battery voltage ranges from 20 to 80 volts; under the normal power generation operation mode, the direct current voltage range is 100-800 volts.
Preferably, the unit starting storage battery device comprises a storage battery and a starting power supply diode, the cathode of the storage battery and the cathode of the direct current bus are both grounded, the anode of the storage battery is connected with the anode of the starting power supply diode, and the cathode of the starting power supply diode is connected with the anode of the direct current bus;
a storage battery detection circuit is arranged between the storage battery and the MCU controller, and a direct current voltage detection circuit is arranged between the direct current bus and the MCU controller; and the MCU controller inputs PWM signals to the machine side converter through the switching tube driver.
Preferably, the unit starting storage battery device further comprises a relay and a charging diode which are connected in sequence, wherein one contact point m of the relay is connected with the anode of the storage battery, the other contact point is connected with the cathode of the charging diode, and the anode of the charging diode is connected to the anode of the direct current bus.
Preferably, the unit starting storage battery device further comprises a charging current-limiting resistor, one end of the charging current-limiting resistor is connected with the anode of the charging diode, and the other end of the charging current-limiting resistor is connected to the anode of the direct current bus.
Preferably, the relay adopts a triode drive type relay.
Preferably, the triode driving relay comprises a relay driving triode and a relay, wherein the relay driving triode is an NPN triode, the base electrode of the relay driving triode is connected with the MCU controller, the emitting electrode of the relay driving triode is grounded, and the collecting electrode of the relay driving triode is connected with the positive electrode of the power supply through the relay.
It should be noted that the fully-controlled device described throughout the present invention refers to a power electronic device that can be controlled to be turned on or turned off by a control signal. Specifically, the fully-controlled device referred to in the present invention may refer to a Gate Turn-Off Thyristor GTO (Gate-Turn-Off Thyristor), a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), and an IGBT (insulated-Gate Bipolar Transistor-IGBT).
The working principle and the advantages of the invention are as follows:
1. the PWM power converter of the full-control device is used as a machine side converter, meanwhile, the direct-current bus parallel unit starts the storage battery device, when the machine side converter is started, the machine set starts the storage battery device to supply power for the generator through MCU control, the machine side converter controls the generator to drag the internal combustion engine to start, and whether the starting requirement is met or not is judged according to the rotating speed of the internal combustion engine, so that a starting motor device in the traditional technology is omitted, the size and the cost of a digital generator system are effectively reduced, and the control method is simple and convenient and is easy to realize;
2. the invention adopts the PWM power converter of the full-control device, under the working power generation working mode of the invention, the MCU controller is adopted to ensure that each component with different characteristics and functions can independently operate and realize the power generation of the digital generator system by a coordinated decoupling control method according to the measurement signal, further, the invention particularly provides an effective control method for the internal combustion engine and the generator, realizes the control of the optimal efficiency tracking operation of the internal combustion engine and the unit power factor operation of the generator respectively, can obviously improve the operating efficiency of the internal combustion engine and the operating power factor of the generator, and has simple and convenient control method and easy realization;
3. the invention further provides a control method of the unit starting storage battery device during starting, the unit starting storage battery device is controlled to supply power according to the comparison of the direct current voltage and the storage battery voltage, and the control method is simple and convenient and is easy to realize;
4. on the basis of the point 3, the invention further provides a control method of the unit starting storage battery device in the normal power generation working mode, the unit starting storage battery device is controlled to be charged according to the voltage of the storage battery, the voltage stability of the storage battery can be maintained, the safety and the reliability of the charging control process can be ensured, and meanwhile, the control method is simple, convenient and easy to implement; the invention realizes the independent control of two modes of low-voltage starting and high-voltage charging of the unit starting storage battery device, and ensures the safety and stability of the operation of the invention;
5. on the basis of the point 3, the invention also provides a starting charging diode arranged between the storage battery and the direct current bus, and the switching of the power supply state of the unit starting storage battery device is realized by starting the charging diode, so that the structure is simple, the control cost is low, and the efficiency and the reliability are realized;
6. on the basis of the point 4, the invention also provides a relay and a charging diode which are arranged between the storage battery and the direct current bus, the switching of the charging state of the storage battery device started by the unit is realized through the relay and the charging diode, and the device has the advantages of simple structure, low control cost, effectiveness and reliability.
Drawings
FIG. 1 is a schematic structural diagram of a digital generator system according to an embodiment of the present invention;
FIG. 2 is a block diagram of the steps of a digital generator system of an embodiment of the present invention at start-up;
FIG. 3 is a block diagram of the steps for controlling an internal combustion engine in a normal power generation mode of the digital generator system according to the embodiment of the present invention;
FIG. 4 is a block diagram of the steps for determining a motor speed command in the control steps of the internal combustion engine in the normal generation mode of operation of the digital generator system in accordance with the embodiment of the present invention;
FIG. 5 is a block diagram of a control algorithm for an internal combustion engine of the digital generator system of the embodiment of the present invention in a normal power generation mode;
FIG. 6 is a block diagram of the control steps of the generator in the normal generation mode of the digital generator system according to the embodiment of the present invention;
FIG. 7 is a block diagram of the steps of controlling the active current of the generator in the control step of the generator in the normal generation mode of operation of the digital generator system according to the embodiment of the present invention;
FIG. 8 is a block diagram of the steps of determining an active current command of a generator in the control step of the generator in the normal generation mode of operation of the digital generator system according to the embodiment of the present invention;
fig. 9 is a block diagram of the steps of controlling the reactive current of the generator in the control step of the generator in the normal power generation mode of the digital generator system according to the embodiment of the present invention;
FIG. 10 is a block diagram of a control algorithm for a generator in a normal generation mode of the digital generator system according to the embodiment of the present invention;
FIG. 11 is a block diagram of the control steps of the unit starting battery device when the digital generator system of the embodiment of the present invention is started;
FIG. 12 is a block diagram of the control steps for the unit to start the battery device in the normal power generation mode of the digital generator system according to the embodiment of the present invention;
fig. 13 is a circuit diagram of the hardware connection between the unit starting battery device and other components in the digital generator system according to the embodiment of the present invention.
Detailed Description
The embodiment of the invention discloses a digital generator system, which comprises an internal combustion engine, a generator, a direct current bus, an inverter, a filter and an output contactor which are sequentially connected, wherein the digital generator system is controlled by an MCU (microprogrammed control Unit) controller, the output contactor is connected with an external load, a machine side converter is connected between the generator and the direct current bus, the machine side converter adopts a PWM (pulse-width modulation) power converter of a full-control device, the direct current bus is connected with a machine set in parallel to start a storage battery device, the machine set start storage battery device supplies power to the generator when the digital generator system is started, and the MCU controller controls the components of the digital generator system by a control method according.
The embodiment of the invention adopts the PWM power converter of the full-control device as the machine side converter, simultaneously, the direct-current bus parallel unit starts the storage battery device, the machine set starts the storage battery device to supply power for the generator through MCU control during starting, the machine side converter controls the generator to drag the internal combustion engine to start, and whether the starting requirement is met or not is judged according to the rotating speed of the internal combustion engine, therefore, the starting motor device in the traditional technology is omitted, and the volume and the cost of a digital generator system are effectively reduced.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Referring to fig. 1, a digital generator system includes an internal combustion engine, a generator, a dc bus, an inverter, a filter, and an output contactor, which are connected in sequence, the digital generator system is controlled by an MCU controller, a side converter is connected between the generator and the dc bus, wherein,
the internal combustion engine is a prime mover of the digital generator and is responsible for converting chemical energy of fuel oil into mechanical energy;
the generator has the basic functions of dragging the internal combustion engine to be directly started when being started, realizing electromechanical energy conversion in a normal power generation working mode, adopting generators in different forms such as a permanent magnet generator, an induction generator and the like, and specifically determining the type of the generator according to actual requirements;
the machine side converter is used for controlling the generator, a PWM power converter adopting a full-control device (any one of GTO, MOSFET and IGBT can be adopted), and the phase number (such as single phase and three phase) of the PWM power converter depends on the phase number of the generator;
the direct current bus is connected with the unit starting storage battery device in parallel, the unit starting storage battery device supplies power to the generator when the digital generator system is started, and preferably, in the embodiment, when the digital generator system is in a normal power generation working mode, the unit starting storage battery device charges and stores energy through the direct current bus; specifically, the direct current bus can adopt an electrolytic capacitor or a film capacitor, and is responsible for supporting the direct current bus voltage LV _ DC and filtering high-frequency harmonics;
the inverter is responsible for outputting alternating current power (including active power and reactive power) meeting the requirement of load voltage (including voltage amplitude, frequency, harmonic distortion rate and the like), and adopts a PWM power converter based on a full-control device (any one of GTO, MOSFET and IGBT can be adopted), and the number of phases (such as single phase and three phases) of the inverter depends on the number of phases of the required output voltage;
the filter is responsible for filtering high-frequency harmonic waves output by the inverter, and preferably, in the embodiment, the filter is composed of passive elements such as an inductor and a capacitor;
the output contactor is connected with an external load and is responsible for connecting or disconnecting the digital generator system and the external load;
the MCU controller (not shown in fig. 1) controls the components of the digital generator system through a control method according to the measurement signals.
Preferably, in this embodiment, referring to fig. 2, the method for controlling the digital generator system during starting includes the following steps:
A1) starting to prepare for starting, ensuring that the output contactor is disconnected, locking the inverter and ensuring that the electric quantity of the unit starting storage battery device is sufficient;
A2) controlling a generator to drag the internal combustion engine to start through a machine side converter;
A3) judging whether the rotation speed of the internal combustion engine meets the starting requirement, if so, entering step A4), and if not, returning to step A2);
A4) and after the start is finished, the digital generator system enters a normal power generation working mode.
Preferably, in the present embodiment, referring to fig. 3, 4 and 5, in the normal power generation operation mode, the control method of the internal combustion engine includes the steps of:
B1) detecting the rotating speed wr of the generator;
B2) the internal combustion engine regulator regulates an internal combustion engine throttle Thro based on a difference value between the detected generator rotating speed wr and the generator rotating speed instruction wr _ ref by taking the realization of the generator rotating speed instruction wr _ ref as a control target; preferably, in step B2), the step of determining the generator speed command wr _ ref is:
B21) detecting the active power P of the generator;
B22) outputting a generator rotating speed instruction wr _ ref based on the detected active power P of the generator and the mechanical characteristics of the rotating speed wr and the active power P when the internal combustion engine is operated at the optimal efficiency as a control target; particularly preferably, in the present embodiment, the mechanical characteristics of the active power P and the rotation speed wr when the internal combustion engine operates at the optimal efficiency are inherent mechanical characteristics of the internal combustion engine, and are determined by a pre-calibration test experiment;
when the detected generator speed wr is lower than the generator speed instruction wr _ ref, the internal combustion engine regulator increases an internal combustion engine throttle Thro; when the detected generator speed wr is higher than the generator speed command wr _ ref, the engine governor decreases the engine throttle Thro.
Preferably, in this embodiment, referring to fig. 6, 7, 8, 9 and 10, in the normal power generation operation mode, the method for controlling the generator includes the following steps:
C1) controlling the active current iq and the reactive current id of the generator;
preferably, in the present embodiment, in step C1), the step of controlling the generator active current iq includes:
C11A), detecting the generator active current iq;
C12A), the generator active current regulator regulating the generator active current iq based on the difference between the detected generator active current iq and the generator active current command iq _ ref, with the generator active current command iq _ ref being a control target; further preferably, in the present embodiment, in the step C12A), the step of determining the generator active current command iq _ ref includes:
D11A), detecting the direct-current voltage HV _ DC;
D12A) to achieve the DC voltage command LV _ DC _ ref, the DC voltage regulator regulates the DC voltage HV _ DC based on the difference between the detected DC voltage HV _ DC and the DC voltage command LV _ DC _ ref, and outputs a generator active current command iq _ ref.
Preferably, in the present embodiment, in step C1), the step of controlling the generator reactive current id is:
C11B), detecting the reactive current id of the generator;
C12B) to achieve a generator reactive current reference id _ ref of 0, the generator reactive current regulator adjusts the generator reactive current id based on the difference between the detected generator reactive current id and the generator reactive current reference id _ ref.
C2) The generator active current regulator outputs a generator q-axis voltage command uq _ ref, and the generator reactive current regulator outputs a generator d-axis voltage command ud _ ref;
C3) controlling the output voltage of the converter on the side based on a q-axis voltage command uq _ ref of the generator and a d-axis voltage command ud _ ref of the generator; preferably, in the present embodiment, in step C3), the step of controlling the machine-side converter output voltage Uabc _ ref includes: coordinate-changing the generator q-axis voltage command uq _ ref and the generator d-axis voltage command ud _ ref output in the above step C2), and determining the side converter output voltage Uabc _ ref.
In this embodiment, the control method of the inverter is a control method of the prior art, and details are not described in this embodiment.
In a normal power generation working mode, the embodiment of the invention provides that an MCU controller is adopted to ensure that each component with different characteristics and functions can independently run and realize power generation of a digital generator system through the above coordination decoupling control method according to a measurement signal, and specifically, the coordination decoupling control divides the digital generator system into three subsystems: the system comprises an internal combustion engine subsystem, a generator subsystem (mainly comprising a generator and a machine side converter) and an inverter subsystem (mainly comprising an inverter, a filter and an output contactor), wherein the control targets of the internal combustion engine subsystem, the generator subsystem (mainly comprising the generator and the machine side converter) and the inverter subsystem (mainly comprising the inverter, the filter and the output contactor) are respectively: 1) the internal combustion engine subsystem is responsible for controlling the rotating speed to realize the optimal efficiency tracking operation of the internal combustion engine; 2) the generator subsystem is responsible for controlling direct-current voltage and realizing the unit power factor operation of the generator; 3) the inverter subsystem is responsible for outputting alternating current that meets the voltage requirements of the external load.
Preferably, in this embodiment, referring to fig. 11, when the digital generator system is started, the method for controlling the unit starting storage battery device provided by the embodiment of the present invention includes the following steps:
S1A), the unit starts the storage battery device to supply power to the generator;
S2A), controlling a generator to drag the internal combustion engine to start through a machine side converter;
S3A), the direct-current voltage HV _ DC rises as the generator speed increases;
S4A), judging whether the direct current voltage HV _ DC is higher than the battery voltage of the unit starting battery device, if so, entering the step S5A), and if not, returning to the step S1A);
S5A), the unit starts the storage battery device to stop supplying power to the generator, and the digital generator system enters a normal power generation working mode after the start is finished.
In this embodiment, when the digital generator system is in the normal power generation operating mode, the unit starting storage battery device charges and stores energy through the direct-current voltage HV _ DC supported by the direct-current bus, however, the rated storage battery voltage of the unit starting storage battery device is low, generally, only tens of volts, while the direct-current voltage HV _ DC is high, generally, hundreds of volts, and when the unit starting storage battery device is directly charged through the high-voltage direct-current voltage HV _ DC, the unit starting storage battery device is easily burnt, so that the safety and reliability problems exist.
In order to solve the above safety and reliability problems, it is preferable that, referring to fig. 12, in the present embodiment, when the digital generator system is in the normal power generation operation mode, the method for controlling the unit starting storage battery device includes the following steps:
S1B), detecting the battery voltage of the battery starting device of the unit;
S2B), judging whether the voltage of the storage battery in the step S1B) is lower than the preset threshold value, if yes, going to the step S3B), and if not, returning to the step S1B);
S3B), the direct current bus charges and stores energy for the unit starting storage battery device;
S4B), judging whether the battery voltage of the step S3B) reaches the rated battery voltage, if yes, going to step S5B), if not, returning to step S3B);
S5B), the direct current bus stops charging and storing energy for the unit starting storage battery device.
Preferably, in the present embodiment, the preset threshold value of the battery voltage is 85 to 98% of the rated battery voltage.
Preferably, in this embodiment, the nominal battery voltage is in the range of 20-80 volts; under the normal power generation operation mode, the direct current voltage HV _ DC is in the range of 100-800V.
Preferably, in this embodiment, please refer to a hardware connection circuit diagram of the digital generator system of the unit starting battery device shown in fig. 13 in the embodiment of the present invention, where the unit starting battery device includes a battery and a starting power supply diode D2, a negative electrode of the battery and a negative electrode of the dc bus C1 are both grounded, a positive electrode of the battery is connected to a positive electrode of the starting power supply diode D2, and a negative electrode of the starting power supply diode D2 is connected to a positive electrode of the dc bus C1; a storage battery detection circuit LV _ DC detect is arranged between the storage battery and the MCU controller, and a direct current voltage detection circuit HV _ DCdetect is arranged between the direct current bus C1 and the MCU controller; the MCU controller MCU Control inputs PWM signals to the machine side converter through a switching tube Driver.
Preferably, in this embodiment, the unit starting battery device further includes a Relay1, a charging diode D1, and a charging current limiting resistor R1, which are connected in sequence, wherein one contact point m of the Relay1 is connected to the positive electrode of the battery, and the other contact point p is connected to the negative electrode of the charging diode D2; one end of the charging current-limiting resistor R1 is connected with the anode of the charging diode D1, and the other end is connected to the anode of the direct current bus C1.
Preferably, in this embodiment, the Relay1 adopts a triode-driven Relay1, which is effective and reliable in control and easy to implement, and of course, as a non-preferred mode, in other embodiments, other types of relays may also be adopted; particularly preferably, the transistor-driven Relay1 includes a Relay-driven transistor Q1 and a Relay1, wherein the Relay-driven transistor Q1 is an NPN-type transistor, a base thereof is connected to the MCU controller, an emitter thereof is grounded, and a collector thereof is connected to the positive VCC of the power supply through the Relay1, in other embodiments, according to actual requirements, the transistor-driven Relay may also adopt other connection modes, or may adopt other types of transistor-driven relays, such as a PNP-type transistor, which are believed to be routine choices of those skilled in the art, and the present invention is not specifically explained; the two ends dryp and drym of the Relay are connected with a Relay current-limiting diode (shown in figure 13 but not marked) to play a role in limiting the induced voltage of the Relay, and effectively protecting the Relay Relay1 from being burnt.
Preferably, in this embodiment, the machine-side converter adopts a PWM power converter integrated by IGBT devices, specifically, adopts 6 IGBT full-controlled devices such as a first IGBT device VT1, a second IGBT device VT2, a third IGBT device VT3, a fourth IGBT device VT4, a fifth IGBT device VT5, and a sixth IGBT device VT6 integrated, in which, a current-limiting diode (shown and not labeled in fig. 13) is connected between the collector and the emitter of each IGBT full-controlled device, the MCU controller MCU Control is connected with the gates of the 6 IGBT full-controlled devices through a switching tube Driver, PWM signals UH, UL, VT, VL, WH, WL are respectively input to the IGBT full-controlled devices, the collector of the first IGBT device VT1, the collector of the third IGBT device VT3, and the collector of the fifth IGBT device 5 are all connected to the positive pole of a dc bus 1, and the emitters of the bus are respectively connected to the collector of the second IGBT device VT4, the collector of the fourth IGBT device VT4, and the collector of the sixth IGBT device 6, meanwhile, the emitter of the first IGBT device VT1, the emitter of the third IGBT device VT3 and the emitter of the fifth IGBT device VT5 are respectively used as three-phase output ends of the generator, namely a U-phase output end, a V-phase output end and a W-phase output end; the emitter of the second IGBT device VT2, the emitter of the fourth IGBT device VT4, and the emitter of the sixth IGBT device VT6 are all grounded.
The working process of the unit starting storage battery device in the embodiment of the invention is as follows:
1) when the digital generator system is started, the storage battery is used as a starting power supply to supply power to the generator through the starting power supply diode D2, meanwhile, the MCU controller MCU Control sends out a PWM signal to drive the PWM power converter to work through the Driver of the switching tube, the internal combustion engine is dragged to start, the direct current voltage HV _ DC rises along with the increase of the rotating speed of the generator, when the direct current voltage HV _ DC is higher than the voltage of the storage battery, the starting power supply diode D2 is turned off, the storage battery stops supplying power to the generator at the moment, the digital generator system finishes starting, and enters a normal power generation working mode.
2) Under the normal power generation working mode of the digital generator system, when the voltage of the storage battery is detected to be lower than a preset threshold value, the MCU controller MCU Control sets the Relay Control signal output by the MCU controller MCU Control to be high, and a Relay driving triode Q1 is opened to Control the attraction of a contact point m and a contact point p of a Relay 1; at this time, the DC voltage HV _ DC charges the battery through the charging current limiting resistor R1, the charging diode D1, and the Relay 1. When the voltage of the storage battery reaches the rated voltage of the storage battery, the MCU Control sets the Relay Control signal to be low, the contact point m and the contact point p of the Relay1 are controlled to be disconnected, the charging loop is disconnected, and the direct-current bus C1 stops charging and storing energy for the storage battery.
The control method for starting the storage battery device by the unit is simple and convenient, easy to implement, simple in control circuit structure, low in control cost, effective and reliable; meanwhile, the embodiment of the invention realizes the independent control of two modes of low-voltage starting and high-voltage charging of the unit starting storage battery device, and ensures the safety and stability of the operation of the invention.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. A kind of digital generator system starts the storage battery apparatus with the unit, the said digital generator system includes internal-combustion engine, generator, direct-flow bus, inverter connected sequentially, the said digital generator system realizes the control through MCU controller, characterized by that, connect the machine side converter between direct-flow bus and the said generator, the said machine side converter adopts PWM power converter of the all-controlled device, the said direct-flow bus connects the unit in parallel to start the storage battery apparatus, the said unit starts the storage battery apparatus and supplies power for the generator when the digital generator system starts, the said MCU controller controls the part of the digital generator system through the control method according to the measured signal; wherein,
when the digital generator system is started, the control method for starting the storage battery device by the unit comprises the following steps:
S1A), the unit starts the storage battery device to supply power to the generator;
S2A), controlling a generator to drag the internal combustion engine to start through a machine side converter;
S3A), the direct current voltage rises along with the increase of the rotating speed of the generator;
S4A), judging whether the direct current voltage is higher than the battery voltage of the unit starting battery device, if so, going to step S5A), and if not, returning to step S1A);
S5A), the unit starts the storage battery device to stop supplying power to the generator, and the digital generator system enters a normal power generation working mode after the start is finished.
2. The unit starting battery device for the digital generator system as claimed in claim 1, wherein the control method of the unit starting battery device in the normal power generating operation mode of the digital generator system comprises the steps of:
S1B), detecting the battery voltage of the battery starting device of the unit;
S2B), judging whether the voltage of the storage battery in the step S1B) is lower than the preset threshold value, if yes, going to the step S3B), and if not, returning to the step S1B);
S3B), the direct current bus charges and stores energy for the unit starting storage battery device;
S4B), judging whether the battery voltage of the step S3B) reaches the rated battery voltage, if yes, going to step S5B), if not, returning to step S3B);
S5B), the direct current bus stops charging and storing energy for the unit starting storage battery device.
3. The unit starting battery device for a digital generator system as claimed in claim 2, wherein the predetermined threshold value of the battery voltage is 85-98% of the rated battery voltage.
4. A unit starting battery device for a digital generator system as claimed in claim 2, wherein said rated battery voltage is in the range of 20-80 v; under the normal power generation operation mode, the direct current voltage range is 100-800 volts.
5. The unit starting battery device for the digital generator system as claimed in claim 1, wherein the unit starting battery device comprises a battery and a starting power supply diode, the negative electrode of the battery is grounded with the negative electrode of the dc bus, the positive electrode of the battery is connected with the positive electrode of the starting power supply diode, and the negative electrode of the starting power supply diode is connected with the positive electrode of the dc bus;
a storage battery detection circuit is arranged between the storage battery and the MCU controller, and a direct current voltage detection circuit is arranged between the direct current bus and the MCU controller; and the MCU controller inputs PWM signals to the machine side converter through the switching tube driver.
6. The unit starting battery device for the digital generator system as claimed in claim 5, further comprising a relay and a charging diode connected in sequence, wherein one contact point m of the relay is connected to the positive pole of the battery, the other contact point m is connected to the negative pole of the charging diode, and the positive pole of the charging diode is connected to the positive pole of the DC bus.
7. The unit starting battery device for the digital generator system as described in claim 6, further comprising a charging current limiting resistor, wherein one end of said charging current limiting resistor is connected to the anode of the charging diode, and the other end is connected to the anode of the dc bus.
8. The unit starting battery device for digital power generator system as claimed in claim 6, wherein said relay is a triode-type relay.
9. The unit start battery device for digital power generator system as claimed in claim 8, wherein the transistor-driven relay comprises a relay-driving transistor and a relay, wherein the relay-driving transistor is an NPN-type transistor having a base connected to the MCU controller, an emitter grounded, and a collector connected to a positive electrode of the power supply through the relay.
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| CN201710251327.XA CN106870236B (en) | 2017-04-18 | 2017-04-18 | A kind of digital electricity generating system unit starting accumulator plant |
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| CN201710251327.XA CN106870236B (en) | 2017-04-18 | 2017-04-18 | A kind of digital electricity generating system unit starting accumulator plant |
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| CN107204715A (en) * | 2017-07-24 | 2017-09-26 | 龚治俊 | A kind of digital electricity generating set control system and method and digital generating set |
| CN108471261A (en) * | 2018-03-14 | 2018-08-31 | 同济大学 | A kind of activation system and method for digital electricity generating group |
| CN110259617A (en) * | 2019-07-24 | 2019-09-20 | 重庆力华自动化技术有限责任公司 | A kind of control device for motorcycle initiating and power generation integrated motor |
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| CN106870236B (en) | 2018-10-30 |
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