CN103166220B - A kind of off-grid type Stirling electric power system structure and control method - Google Patents
A kind of off-grid type Stirling electric power system structure and control method Download PDFInfo
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Abstract
The invention discloses a kind of off-grid type Stirling electric power system structure and control method, described system configuration comprises Stirling engine; Connect the threephase asynchronous machine of Stirling engine; Connect the two-way PWM inverter of threephase asynchronous machine; Connect the two-way DC/DC converter of two-way PWM inverter; Connect user's side inverter of two-way PWM inverter and two-way DC/DC converter; Connect the storage battery of two-way DC/DC converter; Direct voltage transmitter; DC bus-bar voltage for collecting according to direct voltage transmitter controls the controller of two-way PWM inverter and user's side inverter operating state; The present invention can realize the self-starting of Stirling engine, simultaneously for the operation of threephase asynchronous machine provides idle passage, the balance of asynchronous machine, user and storage battery three electric energy can be realized, thus realize Stirling engine from network operation, make the application of high efficiency Stirling engine and asynchronous machine more extensive.
Description
Technical field
The present invention relates to a kind of off-grid type Stirling electric power system structure and control method.
Background technology
At present, energy-saving and emission-reduction have become the focus of social concerns, wherein solar energy and wind energy are owing to having resource abundance, clean, widely distributed feature, make its application more and more extensive, existing off-grid type wind power electric power system, common system configuration comprises wind-driven generator, rectifier, inverter, storage battery, unloader, wind-driven generator connects inverter and storage battery by rectifier, inverter connects user, storage battery connects user by described inverter simultaneously, wind-driven generator wherein adopts magneto alternator or brushless excitation synchronous generator usually, even if adopt asynchronous generator also can compensate the idle of asynchronous generator excitation needs by capacitor, because these generators above are all only operated in generating state, so be attached thereto connect be rectified into the rectifier of direct current for the alternating current exported by generator, and for the change of load and wind regime, then by becoming oar and regulating accumulator cell charging and discharging electric current to reach the stable of this system, existing off-grid type solar electric power supply system, common system configuration comprises solar module, storage battery and inverter, solar module connects inverter by storage battery, inverter connects user, above two kinds of off-grid type electric power systems are all for respective field, for Stirling electricity generation system, can't resolve the self-starting problem of Stirling engine, also there is the utilization of resources insufficient simultaneously, DC bus-bar voltage is unstable, the shortcoming that generating efficiency is not high.
Summary of the invention
The present invention is directed to the proposition of above problem, and develop one and can realize Stirling engine self-starting, and idle passage can be provided for asynchronous machine, realize asynchronous machine, user and storage battery three electric energy balance, thus realize Stirling engine from network operation, the utilization of resources fully, power off-grid type Stirling electric power system structure and control method stable.
Technological means of the present invention is as follows:
A kind of off-grid type Stirling electric power system structure, comprising:
For solar energy or gas thermal energy being converted to the Stirling engine of mechanical energy;
Connect Stirling engine, the mechanical energy when being operated in generating state for being transmitted by Stirling engine is converted to electric energy, and the threephase asynchronous machine when being operated in motoring condition for driving Stirling engine to start;
Connect threephase asynchronous machine, carry out rectification for the AC energy exported threephase asynchronous machine, and the two-way PWM inverter of inversion is carried out to the direct current that two-way DC/DC converter exports;
Two-way PWM inverter is connected by DC bus, after voltage transformation is carried out to the direct current energy exported after two-way PWM inverter rectification, be stored to storage battery, and be transferred to the two-way DC/DC converter of two-way PWM inverter or user's side inverter after voltage transformation is carried out to the direct current energy of battery stores;
Connect two-way PWM inverter and two-way DC/DC converter by DC bus, for after two-way PWM inverter rectification or two-way DC/DC converter export direct current energy carry out inversion after power to user's side inverter of user;
Connect two-way DC/DC converter, for storing direct current energy that two-way DC/DC converter transmits and providing the direct current energy of storage to the storage battery of two-way DC/DC converter;
For gathering DC bus-bar voltage and being transferred to the direct voltage transmitter of controller;
Connect direct voltage transmitter, two-way PWM inverter and user's side inverter respectively, the DC bus-bar voltage for collecting according to direct voltage transmitter controls the controller of two-way PWM inverter and user's side inverter operating state;
In addition, connection control device and two-way DC/DC converter respectively is also comprised, for regulating the two-way DC/DC control unit of the operating state of two-way DC/DC converter and output voltage according to the control signal of controller;
In addition, also comprise connection storage battery, for detecting the storage battery on-line monitoring unit of battery tension, charging and discharging currents and battery temp in real time;
Further, described controller connects storage battery on-line monitoring unit, direct voltage transmitter and two-way DC/DC control unit respectively, battery tension, charging and discharging currents and the battery temp of coming for the DC bus-bar voltage that transmits according to direct voltage transmitter and storage battery on-line monitoring unit real-time Transmission, by transmitting control signal to two-way DC/DC control unit, realize the two-way operating state of DC/DC converter and the adjustment of output voltage;
In addition, the discharging circuit be made up of switching tube, electric power generation unloading resistance and unloading control unit is also comprised; Described switching tube is connected mutually with electric power generation unloading resistance; Described unloading control unit is connection control device and switching tube respectively, for turning on and off of the control signal control switch pipe that transmits according to controller; The switching tube of mutual series connection and electric power generation unloading resistance between the both positive and negative polarity being connected in DC bus.
A control method for off-grid type Stirling electric power system structure, comprises the steps:
S1: direct voltage transmitter Real-time Collection DC bus-bar voltage, performs S2;
S2: the DC bus-bar voltage that controller transmits according to direct voltage transmitter controls to export DC bus to after two-way DC/DC converter carries out voltage transformation to the electric energy of battery stores by two-way DC/DC control unit, storage battery on-line monitoring unit detects battery tension, charging and discharging currents and battery temp in real time simultaneously, performs S3;
S3: controller controls to export to after voltage that DC bus transmits by two-way PWM inverter carries out inversion threephase asynchronous machine and is used for electric energy and changes and continue to provide reactive power into threephase asynchronous machine, after the voltage that DC bus transmits by control user side inverter simultaneously carries out inversion, continued power is to user, performs S4;
S4: threephase asynchronous machine is operated in motoring condition, drives Stirling engine to start after the AC energy that two-way PWM inverter transmits is converted to mechanical energy, performs S5;
S5: after Stirling engine has started, threephase asynchronous machine is operated in generating state, and the mechanical energy transmitted by Stirling engine is converted to electric energy, performs S6;
S6: two-way PWM inverter exports DC bus to after carrying out rectification to the alternating current that threephase asynchronous machine transmits, the battery tension that the DC bus-bar voltage transmitted according to direct voltage transmitter with Time Controller and storage battery on-line monitoring unit transmit, regulate the operating state of two-way DC/DC converter and output voltage to complete to be stored to storage battery after two-way DC/DC converter carries out voltage transformation to DC bus-bar voltage by two-way DC/DC control unit and it is charged, wherein DC bus electric energy equals charge in batteries electric energy with power supply to the electric energy sum of user, perform S7,
S7: the DC bus-bar voltage that controller transmits according to direct voltage transmitter and the battery tension that storage battery on-line monitoring unit transmits, when current battery tension reaches storage battery rated voltage, regulate the operating state of two-way DC/DC converter to stop charge in batteries by two-way DC/DC control unit, complete the adjustment of unloading charged current with Time Controller by the switching frequency of control unloading control unit by-pass cock pipe and electric power generation unloading resistance is put unloading of the unnecessary electric energy of DC bus;
In addition, also comprise step S8: battery tension, charging and discharging currents and battery temp that controller transmits according to storage battery on-line monitoring unit, when battery tension is lower than a certain threshold voltage, the operating state of two-way DC/DC converter is regulated to stop battery discharging by two-way DC/DC control unit.
Owing to have employed technique scheme, a kind of off-grid type Stirling electric power system structure provided by the invention and control method, by Stirling engine, solar energy or gas thermal energy are converted to mechanical energy, adopt and can be operated in motoring condition and convert electrical energy into mechanical energy and drive Stirling engine to start to be operated in again mechanical energy that Stirling engine transmits by generating state to be converted to the threephase asynchronous machine of electric energy, can be operated in inverter mode DC bus-bar voltage is carried out DC-AC conversion after output AC electricity be converted to mechanical energy to the threephase asynchronous machine being operated in motoring condition, and be continuously threephase asynchronous machine reactive power is provided, the two-way PWM inverter transferring to DC bus after rectification state carries out AC-DC conversion to the threephase asynchronous machine institute output AC electric energy being operated in generating state can be operated in again simultaneously, charge a battery after DC bus-bar voltage can being carried out voltage transformation, the two-way DC/DC converter of DC bus is transferred to after the electric energy of accumulators store being carried out voltage transformation again, generating efficiency of the present invention is high, the self-starting of Stirling engine can be realized, simultaneously for the operation of threephase asynchronous machine provides idle passage, operating state and the output voltage of discharging circuit and two-way DC/DC converter is controlled by controller, and then control charging/discharging voltage and the electric current of storage battery, ensure that the stable of DC bus-bar voltage, ensure that the power supply quality to user, during system cloud gray model, asynchronous machine can be realized by regulating the charging and discharging currents of storage battery, the balance of user and storage battery three electric energy, achieve generating, the balance of electricity consumption and discharge and recharge, thus realize Stirling engine from network operation, this system power supply is stablized, make the application of high efficiency stirling generator group and asynchronous machine more extensive.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention.
Embodiment
A kind of off-grid type Stirling electric power system structure as shown in Figure 1, comprising: for solar energy or gas thermal energy being converted to the Stirling engine of mechanical energy; Connect Stirling engine, the mechanical energy when being operated in generating state for being transmitted by Stirling engine is converted to electric energy, and the threephase asynchronous machine when being operated in motoring condition for driving Stirling engine to start; Connect threephase asynchronous machine, carry out rectification for the AC energy exported threephase asynchronous machine, and the two-way PWM inverter of inversion is carried out to the direct current that two-way DC/DC converter exports; Two-way PWM inverter is connected by DC bus, after voltage transformation is carried out to the direct current energy exported after two-way PWM inverter rectification, be stored to storage battery, and be transferred to the two-way DC/DC converter of two-way PWM inverter or user's side inverter after voltage transformation is carried out to the direct current energy of battery stores; Connect two-way PWM inverter and two-way DC/DC converter by DC bus, for after two-way PWM inverter rectification or two-way DC/DC converter export direct current energy carry out inversion after power to user's side inverter of user; Connect two-way DC/DC converter, for storing direct current energy that two-way DC/DC converter transmits and providing the direct current energy of storage to the storage battery of two-way DC/DC converter; For gathering DC bus-bar voltage and being transferred to the direct voltage transmitter of controller; Connect direct voltage transmitter, two-way PWM inverter and user's side inverter respectively, the DC bus-bar voltage for collecting according to direct voltage transmitter controls the controller of two-way PWM inverter and user's side inverter operating state; In addition, connection control device and two-way DC/DC converter respectively is also comprised, for regulating the two-way DC/DC control unit of the operating state of two-way DC/DC converter and output voltage according to the control signal of controller; Also comprise connection storage battery, for detecting the storage battery on-line monitoring unit of battery tension, charging and discharging currents and battery temp in real time; Further, described controller connects storage battery on-line monitoring unit, direct voltage transmitter and two-way DC/DC control unit respectively, battery tension, charging and discharging currents and the battery temp of coming for the DC bus-bar voltage that transmits according to direct voltage transmitter and storage battery on-line monitoring unit real-time Transmission, by transmitting control signal to two-way DC/DC control unit, realize the two-way operating state of DC/DC converter and the adjustment of output voltage; In addition, the discharging circuit be made up of switching tube, electric power generation unloading resistance and unloading control unit is also comprised; Described switching tube is connected mutually with electric power generation unloading resistance; Described unloading control unit is connection control device and switching tube respectively, for turning on and off of the control signal control switch pipe that transmits according to controller; The switching tube of mutual series connection and electric power generation unloading resistance between the both positive and negative polarity being connected in DC bus.
A control method for off-grid type Stirling electric power system structure, comprises the steps:
S1: direct voltage transmitter Real-time Collection DC bus-bar voltage, performs S2;
S2: the DC bus-bar voltage that controller transmits according to direct voltage transmitter controls to export DC bus to after two-way DC/DC converter carries out voltage transformation to the electric energy of battery stores by two-way DC/DC control unit, storage battery on-line monitoring unit detects battery tension, charging and discharging currents and battery temp in real time simultaneously, performs S3;
S3: controller controls to export to after voltage that DC bus transmits by two-way PWM inverter carries out inversion threephase asynchronous machine and is used for electric energy and changes and continue to provide reactive power into threephase asynchronous machine, after the voltage that DC bus transmits by control user side inverter simultaneously carries out inversion, continued power is to user, performs S4;
S4: threephase asynchronous machine is operated in motoring condition, drives Stirling engine to start after the AC energy that two-way PWM inverter transmits is converted to mechanical energy, performs S5;
S5: after Stirling engine has started, threephase asynchronous machine is operated in generating state, and the mechanical energy transmitted by Stirling engine is converted to electric energy, performs S6;
S6: two-way PWM inverter exports DC bus to after carrying out rectification to the alternating current that threephase asynchronous machine transmits, the battery tension that the DC bus-bar voltage transmitted according to direct voltage transmitter with Time Controller and storage battery on-line monitoring unit transmit, regulate the operating state of two-way DC/DC converter and output voltage to complete to be stored to storage battery after two-way DC/DC converter carries out voltage transformation to DC bus-bar voltage by two-way DC/DC control unit and it is charged, wherein DC bus electric energy equals charge in batteries electric energy with power supply to the electric energy sum of user, perform S7,
S7: the DC bus-bar voltage that controller transmits according to direct voltage transmitter and the battery tension that storage battery on-line monitoring unit transmits, when current battery tension reaches storage battery rated voltage, regulate the operating state of two-way DC/DC converter to stop charge in batteries by two-way DC/DC control unit, complete the adjustment of unloading charged current with Time Controller by the switching frequency of control unloading control unit by-pass cock pipe and electric power generation unloading resistance is put unloading of the unnecessary electric energy of DC bus;
In addition, also comprise step S8: battery tension, charging and discharging currents and battery temp that controller transmits according to storage battery on-line monitoring unit, when battery tension is lower than a certain threshold voltage, the operating state of two-way DC/DC converter is regulated to stop battery discharging by two-way DC/DC control unit.
A kind of off-grid type Stirling electric power system structure provided by the invention and control method, by Stirling engine, solar energy or gas thermal energy are converted to mechanical energy, adopt and can be operated in motoring condition and convert electrical energy into mechanical energy and drive Stirling engine to start to be operated in again mechanical energy that Stirling engine transmits by generating state to be converted to the threephase asynchronous machine of electric energy, can be operated in inverter mode DC bus-bar voltage is carried out DC-AC conversion after output AC electricity be converted to mechanical energy to the threephase asynchronous machine being operated in motoring condition, and be continuously threephase asynchronous machine reactive power is provided, the two-way PWM inverter transferring to DC bus after rectification state carries out AC-DC conversion to the threephase asynchronous machine institute output AC electric energy being operated in generating state can be operated in again simultaneously, charge a battery after DC bus-bar voltage can being carried out voltage transformation, the two-way DC/DC converter of DC bus is transferred to after the electric energy of accumulators store being carried out voltage transformation again, generating efficiency of the present invention is high, the self-starting of Stirling engine can be realized, simultaneously for the operation of threephase asynchronous machine provides idle passage, operating state and the output voltage of discharging circuit and two-way DC/DC converter is controlled by controller, and then control charging/discharging voltage and the electric current of storage battery, ensure that the stable of DC bus-bar voltage, ensure that the power supply quality to user, during system cloud gray model, asynchronous machine can be realized by regulating the charging and discharging currents of storage battery, the balance of user and storage battery three electric energy, achieve generating, the balance of electricity consumption and discharge and recharge, thus realize Stirling engine from network operation, this system power supply is stablized, make the application of high efficiency stirling generator group and asynchronous machine more extensive.Because threephase asynchronous machine is induction machine, when the rotary speed of its rotor is higher than the rotary speed in magnetic field, then threephase asynchronous machine is operated in generating state, use as generator, when the speed of its rotor is lower than the rotary speed in magnetic field, then threephase asynchronous machine is operated in motoring condition, uses as motor, as selected the threephase asynchronous machine of 4 poles, its synchronous speed is 1500rpm, then, when rotating speed is lower than 1500rpm, it is motor, when rotating speed is higher than 1500rpm, it is generator, under motoring condition, the rotating speed of threephase asynchronous machine is generally by Frequency Converter Control, under generating state, the electric energy exported when threephase asynchronous machine is greater than actual consumption electric energy, Stirling engine drives threephase asynchronous machine speedup, the electric energy exported when threephase asynchronous machine is less than actual consumption electric energy, Stirling engine drives threephase asynchronous machine to slow down, no matter when threephase asynchronous machine is operated in motoring condition or generating state, controller all controls to export to threephase asynchronous machine after two-way PWM inverter continues to carry out inversion to DC bus-bar voltage and provides reactive power, and control to power to user after user's side inverter continues that DC bus-bar voltage is carried out inversion, storage battery on-line monitoring unit detects battery tension in real time, charging and discharging currents and battery temp parameter, the operating state of two-way DC/DC converter is controlled to avoid the battery damage caused thus by two-way DC/DC control unit when charging and discharging currents and battery temp exception, when system starts, storage battery release electric energy gives two-way DC/DC converter, the DC bus-bar voltage that direct voltage transmitter now monitors is greater than initial voltage, controller carries out voltage transformation DC power output by controlling two-way DC/DC control unit and then controlling two-way DC/DC converter to the electric energy that storage battery discharges, this direct current energy exports two-way PWM inverter and user's side inverter to by DC bus, the direct voltage that the two-way DC/DC converter that direct voltage transmitters sense to DC bus has exports also outputs signal to controller, controller controls to export to after voltage that DC bus transmits by two-way PWM inverter carries out inversion threephase asynchronous machine and is used for electric energy and changes and continue to provide reactive power into threephase asynchronous machine, and control voltage that DC bus transmits by user side inverter carry out inversion after continued power to user, storage battery on-line monitoring unit Real-Time Monitoring battery tension in addition, discharging current and temperature, when the battery tension detected is lower than a certain threshold voltage, control two-way DC/DC converter by two-way DC/DC control unit to stop converting and then avoided to put to storage battery input electric energy, the AC energy that two-way PWM inverter exports exports to threephase asynchronous machine, threephase asynchronous machine is operated in motoring condition and converts electrical energy into mechanical energy, Stirling engine is driven to complete startup, Stirling engine completes the conversion of gas thermal energy to mechanical energy after starting, Stirling engine drives threephase asynchronous machine to be operated in generating state, mechanical energy is converted to after electric energy completes rectification by two-way PWM inverter and exports direct current to DC bus, controller according to direct voltage transmitters sense to two-way PWM inverter export the battery tension that the direct current of DC bus and storage battery on-line monitoring unit transmit to, control to export to charge in batteries after two-way DC/DC converter carries out voltage transformation to the direct current that DC bus inputs by two-way DC/DC control unit, the voltage of storage battery on-line monitoring unit Real-Time Monitoring storage battery simultaneously, charging current and temperature, when the battery tension detected reaches storage battery rated voltage, the operating state of two-way DC/DC converter is regulated to stop charge in batteries and then avoid overcharging by two-way DC/DC control unit, the adjustment of unloading charged current is completed by the switching frequency controlling unloading control unit by-pass cock pipe and electric power generation unloading resistance is put unloading of the unnecessary electric energy of DC bus with Time Controller, discharging circuit of the present invention is by switching tube, electric power generation unloading resistance and unloading control unit are formed, switching tube is connected mutually with electric power generation unloading resistance, unloading control unit is connection control device and switching tube respectively, for turning on and off of the control signal control switch pipe that transmits according to controller, the switching tube of mutual series connection and electric power generation unloading resistance between the both positive and negative polarity being connected in DC bus, the control signal transmitted by controller in real work utilizes the switching frequency of unloading control unit by-pass cock pipe, thus realizes the adjustment of unloading charged current.
The above; be only the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.
Claims (6)
1. an off-grid type Stirling electric power system structure, is characterized in that comprising:
For solar energy or gas thermal energy being converted to the Stirling engine of mechanical energy;
Connect Stirling engine, the mechanical energy when being operated in generating state for being transmitted by Stirling engine is converted to electric energy, and the threephase asynchronous machine when being operated in motoring condition for driving Stirling engine to start;
Connect threephase asynchronous machine, carry out rectification for the AC energy exported threephase asynchronous machine, and the two-way PWM inverter of inversion is carried out to the direct current that two-way DC/DC converter exports;
Two-way PWM inverter is connected by DC bus, after voltage transformation is carried out to the direct current energy exported after two-way PWM inverter rectification, be stored to storage battery, and be transferred to the two-way DC/DC converter of two-way PWM inverter or user's side inverter after voltage transformation is carried out to the direct current energy of battery stores;
Connect two-way PWM inverter and two-way DC/DC converter by DC bus, for after two-way PWM inverter rectification or two-way DC/DC converter export direct current energy carry out inversion after power to user's side inverter of user;
Connect two-way DC/DC converter, for storing direct current energy that two-way DC/DC converter transmits and providing the direct current energy of storage to the storage battery of two-way DC/DC converter;
For gathering DC bus-bar voltage and being transferred to the direct voltage transmitter of controller;
Connect direct voltage transmitter, two-way PWM inverter and user's side inverter respectively, the DC bus-bar voltage for collecting according to direct voltage transmitter controls the controller of two-way PWM inverter and user's side inverter operating state;
Also comprise connection storage battery, for detecting the storage battery on-line monitoring unit of battery tension, charging and discharging currents and battery temp in real time;
When system starts, storage battery release electric energy gives two-way DC/DC converter, the DC bus-bar voltage that direct voltage transmitter now monitors is greater than initial voltage, controller controls two-way DC/DC converter and carries out voltage transformation DC power output to the electric energy that storage battery discharges, this direct current energy exports two-way PWM inverter and user's side inverter to by DC bus, the direct voltage that the two-way DC/DC converter that direct voltage transmitters sense to DC bus has exports also outputs signal to controller, controller controls to export to after voltage that DC bus transmits by two-way PWM inverter carries out inversion threephase asynchronous machine and is used for electric energy and changes and continue to provide reactive power into threephase asynchronous machine, and control voltage that DC bus transmits by user side inverter carry out inversion after continued power to user, the AC energy that two-way PWM inverter exports exports to threephase asynchronous machine, threephase asynchronous machine is operated in motoring condition and converts electrical energy into mechanical energy, Stirling engine is driven to complete startup, Stirling engine completes the conversion to mechanical energy of solar energy or gas thermal energy after starting, Stirling engine drives threephase asynchronous machine to be operated in generating state, mechanical energy is converted to after electric energy completes rectification by two-way PWM inverter and exports direct current to DC bus, controller according to direct voltage transmitters sense to two-way PWM inverter export the battery tension that the direct current of DC bus and storage battery on-line monitoring unit transmit to, control to export to charge in batteries after two-way DC/DC converter carries out voltage transformation to the direct current that DC bus inputs, the voltage of storage battery on-line monitoring unit Real-Time Monitoring storage battery simultaneously, charging current and temperature, when the battery tension detected reaches storage battery rated voltage, the operating state of two-way DC/DC converter is regulated to stop charge in batteries.
2. a kind of off-grid type Stirling electric power system structure according to claim 1, characterized by further comprising connection control device and two-way DC/DC converter respectively, for regulating the two-way DC/DC control unit of the operating state of two-way DC/DC converter and output voltage according to the control signal of controller.
3. a kind of off-grid type Stirling electric power system structure according to claim 2, it is characterized in that described controller connects storage battery on-line monitoring unit, direct voltage transmitter and two-way DC/DC control unit respectively, battery tension, charging and discharging currents and the battery temp of coming for the DC bus-bar voltage that transmits according to direct voltage transmitter and storage battery on-line monitoring unit real-time Transmission, by transmitting control signal to two-way DC/DC control unit, realize the two-way operating state of DC/DC converter and the adjustment of output voltage.
4. a kind of off-grid type Stirling electric power system structure according to claim 1, characterized by further comprising the discharging circuit be made up of switching tube, electric power generation unloading resistance and unloading control unit; Described switching tube is connected mutually with electric power generation unloading resistance; Described unloading control unit is connection control device and switching tube respectively, for turning on and off of the control signal control switch pipe that transmits according to controller; The switching tube of mutual series connection and electric power generation unloading resistance between the both positive and negative polarity being connected in DC bus.
5. a control method for off-grid type Stirling electric power system structure, is characterized in that comprising the steps:
S1: direct voltage transmitter Real-time Collection DC bus-bar voltage, performs S2;
S2: the DC bus-bar voltage that controller transmits according to direct voltage transmitter controls to export DC bus to after two-way DC/DC converter carries out voltage transformation to the electric energy of battery stores by two-way DC/DC control unit, storage battery on-line monitoring unit detects battery tension, charging and discharging currents and battery temp in real time simultaneously, performs S3;
S3: controller controls to export to after voltage that DC bus transmits by two-way PWM inverter carries out inversion threephase asynchronous machine and is used for electric energy and changes and continue to provide reactive power into threephase asynchronous machine, after the voltage that DC bus transmits by control user side inverter simultaneously carries out inversion, continued power is to user, performs S4;
S4: threephase asynchronous machine is operated in motoring condition, drives Stirling engine to start after the AC energy that two-way PWM inverter transmits is converted to mechanical energy, performs S5;
S5: after Stirling engine has started, threephase asynchronous machine is operated in generating state, and the mechanical energy transmitted by Stirling engine is converted to electric energy, performs S6;
S6: two-way PWM inverter exports DC bus to after carrying out rectification to the alternating current that threephase asynchronous machine transmits, the battery tension that the DC bus-bar voltage transmitted according to direct voltage transmitter with Time Controller and storage battery on-line monitoring unit transmit, regulate the operating state of two-way DC/DC converter and output voltage to complete to be stored to storage battery after two-way DC/DC converter carries out voltage transformation to DC bus-bar voltage by two-way DC/DC control unit and it is charged, wherein DC bus electric energy equals charge in batteries electric energy with power supply to the electric energy sum of user, perform S7,
S7: the DC bus-bar voltage that controller transmits according to direct voltage transmitter and the battery tension that storage battery on-line monitoring unit transmits, when current battery tension reaches storage battery rated voltage, regulate the operating state of two-way DC/DC converter to stop charge in batteries by two-way DC/DC control unit, complete the adjustment of unloading charged current with Time Controller by the switching frequency of control unloading control unit by-pass cock pipe and electric power generation unloading resistance is put unloading of the unnecessary electric energy of DC bus.
6. the control method of a kind of off-grid type Stirling electric power system structure according to claim 5, characterized by further comprising step S8: battery tension, charging and discharging currents and battery temp that controller transmits according to storage battery on-line monitoring unit, when battery tension is lower than a certain threshold voltage, the operating state of two-way DC/DC converter is regulated to stop battery discharging by two-way DC/DC control unit.
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| CN107394778A (en) * | 2017-09-07 | 2017-11-24 | 大连宏海新能源发展有限公司 | A kind of modified off-network Stirling electric power system structure and control method |
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| JP2000139083A (en) * | 1998-11-04 | 2000-05-16 | Mitsubishi Electric Corp | Power source voltage adjusting apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255596A (en) * | 2011-07-15 | 2011-11-23 | 广东工业大学 | Off-grid double-fed wind power generation system and maximum wind energy capture method thereof |
| CN102684587A (en) * | 2012-05-14 | 2012-09-19 | 大连宏海新能源发展有限公司 | Off-grid Sterling generating set and control method thereof |
| CN203151093U (en) * | 2013-03-30 | 2013-08-21 | 大连宏海新能源发展有限公司 | Off-grid Stirling power supply system structure |
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