CN207542779U - A kind of modified off-network Stirling electric power system structure - Google Patents
A kind of modified off-network Stirling electric power system structure Download PDFInfo
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- CN207542779U CN207542779U CN201721142322.5U CN201721142322U CN207542779U CN 207542779 U CN207542779 U CN 207542779U CN 201721142322 U CN201721142322 U CN 201721142322U CN 207542779 U CN207542779 U CN 207542779U
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The utility model discloses a kind of modified off-network Stirling electric power system structure, the system structure includes Stirling engine system；Connect the two-way PWM inverter of Stirling engine system；Connect user's side inverter of two-way PWM inverter and accumulator；DC bus-bar voltage detection unit；For controlling the controller of two-way PWM inverter and user's side inverter working condition according to the collected DC bus-bar voltage of DC bus-bar voltage detection unit；The utility model can realize the self-starting of Stirling engine, simultaneously idle channel is provided for the operation of threephase asynchronous machine, it can realize the balance of asynchronous machine, user and accumulator three's electric energy, so as to fulfill the off-grid operation of Stirling engine, the system power supply is stablized, the situation of system job insecurity is improved, further improves the replicability of stirling generator system.
Description
Technical field
The utility model is related to Stirling electric power systems, in particular relate to a kind of modified off-network Stirling electric power system knot
Structure.
Background technology
Solar energy and wind energy are due to having the characteristics that resource is sufficient, cleans, widely distributed so that its application is more and more wider
It is general, and the research and application of clean energy resource electric power system, it will be as the forward position of future source of energy industry development.
Existing off-grid type wind power electric power system is general using forever due to not involving the electronic starting problem of generator
Magnetic-synchro generator or brushless excitation synchronous generator.The conventional structure of system includes wind-driven generator, rectifier, inversion
Device, accumulator, unloader etc., wind-driven generator connect inverter and accumulator by rectifier, and inverter connects user, simultaneously
Accumulator connects user also by inverter.There are also wind power supply system using asynchronous generator, capacitor can be passed through
To compensate the idle of asynchronous generator excitation needs.The generator used in above-mentioned wind power supply system is all operated in power generation shape
State, so the connected rectifier for the alternating current that generator is exported to be rectified into direct current, and for load and
The variation of wind regime then needs through variable pitch and adjusting accumulator cell charging and discharging electric current to reach the stabilization of the system.
Existing off-grid type solar electric power supply system, system convention structure include solar cell module, accumulator and inverse
Become device, solar cell module connects inverter, inverter connection user by accumulator.
Above two system is combined generation in respective application field with Stirling electricity generation system, but solution is never
The self-starting problem of Stirling engine, while there is also the utilization of resources during clean energy resource use is insufficient, direct current
The problem of busbar voltage is unstable, and generating efficiency is not high.
Application No. is 103166220 A of CN patent of invention disclose a kind of off-grid type Stirling electric power system structure and
Control method can realize the self-starting of Stirling engine, while the operation for threephase asynchronous machine provides idle channel.But
During the running, when two-way DC/DC converters are in decompression state, the nothing needed for generator is not supplemented effectively
Work(, when system switchs to decompression state by pressure-increasning state, there is all standing in system.
Invention content
In view of insufficient existing for prior art, the purpose of this utility model, which is to provide for one kind, can continue to supplement asynchronous hair
Motor is idle, and stable electric power system structure.
To achieve these goals, present invention employs the realizations of following technical solution：
A kind of modified off-network Stirling electric power system structure, it is characterised in that including：
Stirling engine system；
Connect Stirling engine system, to when Stirling engine starts to being exported by Stirling engine system
AC energy carry out DC inversion and Stirling launching system start before receive accumulator output direct current energy it is two-way
PWM inverter；
Two-way PWM inverter is connected through dc bus, it is inverse to store two-way PWM in Stirling engine starting state
Become the direct current energy of device output and Stirling starts to provide the accumulator of direct current energy before starting to the two-way PWM inverter；
Dc bus is connected, to detect the DC bus-bar voltage detection unit of DC voltage；
Two-way PWM inverter and controller are connected by dc bus, for after two-way PWM inverter rectification or electric power storage
The direct current energy of pond output carries out user's side inverter of supply user after inversion；
Dc bus and electric power generation unloading resistance are connected respectively, to adjust the unloading control device of electric power generation unloading resistance；
Two-way PWM inverter, user's side inverter and DC bus-bar voltage detection unit are connected respectively, for according to direct current
Busbar voltage controls the controller of two-way PWM inverter, user's side inverter working condition.
Further, it further includes and connects accumulator and controller respectively, to monitor accumulator status in real time, ensure to store
The accumulator on-line monitoring system of battery work safety.
Further, the accumulator on-line monitoring system monitors the state of accumulator including at least accumulator electricity in real time
Pressure, charging and discharging currents and battery temp.
Further, the controller connect respectively accumulator on-line monitoring unit, DC bus-bar voltage detection unit with
And unloading control device, it is online for the DC bus-bar voltage and accumulator that are transmitted according to DC bus-bar voltage detection unit
The accumulator status information that monitoring unit real-time Transmission comes controls signal to give unloading control device, realizes to off-load by transmission
The working condition of resistance is adjusted.
Further, it further includes：
User's side inverter is connected, the direct current energy to be exported to user's side inverter carries out the wave filter of rectification；
It is connected between wave filter and user, to adjust the transformer of DC voltage.
Further, the Stirling engine system includes Stirling engine and threephase asynchronous machine.
Compared with prior art, beneficial effects of the present invention：
The utility model provides a kind of modified off-grid type Stirling electric power system structure, electronic using that can be operated in
State converts electrical energy into mechanical energy drive Stirling engine startup and can be operated in generating state and passes Stirling engine
The defeated mechanical energy to come is converted to the threephase asynchronous machine of electric energy；Inverter mode can be operated in carry out DC bus-bar voltage
Output exchange supplies electricity to be operated in the threephase asynchronous machine of motoring condition and is converted to mechanical energy and is continuously three after DC-AC transformation
Phase Induction Machines provide reactive power, while can be operated in rectification state again to being operated in the threephase asynchronous machine institute of generating state
The two-way PWM inverter of dc bus is transmitted to after output AC energy progress AC-DC transformation；Can by DC bus-bar voltage into
It charges a battery after row voltage transformation.Generating efficiency of the present invention is high, can realize the self-starting of Stirling engine, be simultaneously
The operation of threephase asynchronous machine provides idle channel, is participated in without two-way DC/DC converters, is only unloaded by controller control charged
Working condition and output voltage are hindered, and then controls the charging/discharging voltage and electric current of accumulator, ensure that the steady of DC bus-bar voltage
It is fixed, and idle channel can be provided for asynchronous machine, it ensure that the power supply quality to user, during system operation, tune can be passed through
The charging and discharging currents of accumulator are saved to realize the balance of asynchronous machine, user and accumulator three's electric energy, realize power generation, electricity consumption
With the balance of charge and discharge, so as to fulfill the off-grid operation of Stirling engine, which stablizes, and improves two-way DC/DC
Converter leads to the situation of system job insecurity, further improves the replicability of stirling generator system.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Some bright embodiments, for those of ordinary skill in the art, without having to pay creative labor, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is Tthe utility model system structure diagram.
Specific embodiment
Purpose, technical scheme and advantage to make the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
All other embodiments obtained without creative efforts shall fall within the protection scope of the present invention.
It is as shown in Figure 1 a kind of modified off-network Stirling electric power system structure, including：Stirling engine system；Even
Stirling engine system is connect, to the AC energy when Stirling engine starts to being exported by Stirling engine system
It carries out DC inversion and the two-way PWM inverter of the direct current energy of accumulator output is received before Stirling launching system starts；
Two-way PWM inverter is connected through dc bus, to store two-way PWM inverter output in Stirling engine starting state
Direct current energy and Stirling start to provide the accumulator of direct current energy before starting to the two-way PWM inverter；Connect direct current
Busbar, to detect the DC bus-bar voltage detection unit of DC voltage；Two-way PWM inverter and control are connected by dc bus
Device processed, for the user to supplying user after two-way PWM inverter rectification or after the direct current energy progress inversion of accumulator output
Side inverter；Dc bus and electric power generation unloading resistance are connected respectively, to adjust the unloading control device of electric power generation unloading resistance；It connects respectively two-way
PWM inverter, user's side inverter and DC bus-bar voltage detection unit, for controlling two-way PWM according to DC bus-bar voltage
The controller of inverter, user's side inverter working condition.Further, it further includes and connects accumulator and controller respectively,
To the accumulator on-line monitoring system for monitoring accumulator status in real time, ensureing battery-operated safety.Further, the storage
The state that battery on-line monitoring system monitors accumulator in real time includes at least battery tension, charging and discharging currents and accumulator temperature
Degree.Further, the controller connects accumulator on-line monitoring unit, DC bus-bar voltage detection unit and off-load respectively
Controller, DC bus-bar voltage and accumulator for being transmitted according to DC bus-bar voltage detection unit are monitored on-line single
The accumulator status information that first real-time Transmission comes controls signal to give unloading control device, realizes to electric power generation unloading resistance by transmission
Working condition is adjusted.Further, it further includes：User's side inverter is connected, to the direct current exported to user's side inverter
It can carry out the wave filter of rectification；It is connected between wave filter and user, to adjust the transformer of DC voltage.Further,
The Stirling engine system includes Stirling engine and threephase asynchronous machine.
The control method of above-mentioned modified off-network Stirling electric power system structure, step include：
S1：DC bus-bar voltage detection unit acquires DC bus-bar voltage in real time, performs S2；
S2：Accumulator on-line monitoring unit detects battery tension, charging and discharging currents and battery temp in real time, performs
S3；
S3：Controller controls two-way PWM inverter to be exported after the voltage that dc bus transmits is carried out inversion to three
Phase Induction Machines are converted for electric energy and persistently provide reactive power into threephase asynchronous machine, while control user's side inverter
Continued power performs S4 to user after the voltage that dc bus is transmitted carries out inversion；
S4：Threephase asynchronous machine is operated in motoring condition, and the AC energy that two-way PWM inverter transmits is converted to
Stirling engine is driven to start after mechanical energy, perform S5；
S5：After Stirling engine start completion, threephase asynchronous machine is operated in generating state, and Stirling engine is passed
The defeated mechanical energy to come is converted to electric energy, performs S6；
S6：Output is female to direct current after two-way PWM inverter carries out the alternating current that threephase asynchronous machine transmits rectification
Line, while the DC bus-bar voltage that is transmitted according to DC bus-bar voltage detection unit of controller and accumulator are monitored on-line
The battery tension that unit transmits, charges to accumulator, and the electric energy that dc bus is kept to convey is equal to accumulator
Rechargeable electrical energy performs S7 with supplying electricity to the sum of electric energy of user；
S7：The DC bus-bar voltage and accumulator that controller is transmitted according to DC voltage transmitter are monitored on-line single
The battery tension that member is transmitted, current battery tension reach accumulator rated voltage, stop charging to accumulator, together
When controller by the way that unloading control unit is controlled further to adjust by adjusting electric power generation unloading resistance the charging current of accumulator, unload and straighten
Flow the extra electric energy of busbar.
Further, S8 is further included：Controller monitors battery tension, the charge and discharge that unit acquires on-line according to accumulator
Electric current and battery temp when battery tension is less than a certain threshold voltage, stop battery discharging.
A kind of modified off-grid type Stirling electric power system structure provided by the utility model, it is electronic using that can be operated in
State converts electrical energy into mechanical energy drive Stirling engine startup and can be operated in generating state and passes Stirling engine
The defeated mechanical energy to come is converted to the threephase asynchronous machine of electric energy；Inverter mode can be operated in carry out DC bus-bar voltage
Output exchange supplies electricity to be operated in the threephase asynchronous machine of motoring condition and is converted to mechanical energy and is continuously three after DC-AC transformation
Phase Induction Machines provide reactive power, while can be operated in rectification state again to being operated in the threephase asynchronous machine institute of generating state
The two-way PWM inverter of dc bus is transmitted to after output AC energy progress AC-DC transformation；Can by DC bus-bar voltage into
It charges a battery after row voltage transformation.Generating efficiency of the present invention is high, can realize the self-starting of Stirling engine, be simultaneously
The operation of threephase asynchronous machine provides idle channel, is participated in without two-way DC/DC converters, is only unloaded by controller control charged
Working condition and output voltage are hindered, and then controls the charging/discharging voltage and electric current of accumulator, ensure that the steady of DC bus-bar voltage
It is fixed, and idle channel can be provided for asynchronous machine, it ensure that the power supply quality to user, during system operation, tune can be passed through
The charging and discharging currents of accumulator are saved to realize the balance of asynchronous machine, user and accumulator three's electric energy, realize power generation, electricity consumption
With the balance of charge and discharge, so as to fulfill the off-grid operation of Stirling engine, which stablizes, and improves two-way DC/DC
Converter leads to the situation of system job insecurity, further improves the replicability of stirling generator system.The present invention
In use, if total load is less than generated energy, busbar voltage can increase, the charging current increase of accumulator；It is if total negative
It carries and is more than generated energy, then busbar voltage reduces, and corresponding battery charging current reduces.As a kind of induction machine, work as three-phase
When the rotary speed of asynchronous machine rotor is higher than the rotary speed in magnetic field, threephase asynchronous machine is operated in generating state, as hair
Motor uses；When the speed of its rotor is less than the rotary speed in magnetic field, threephase asynchronous machine is operated in motoring condition, as electricity
Motivation uses, and such as selects the threephase asynchronous machine of 4 poles, synchronous rotational speed 1500rpm, then when rotating speed is less than 1500rpm
When, it is motor, is generator when rotating speed is higher than 1500rpm.Under motoring condition, the rotating speed of threephase asynchronous machine
It is phase asynchronous when the electric energy of threephase asynchronous machine output is more than actual consumption electric energy under generating state generally by Frequency Converter Control
Motor is with Stirling engine speedup, when the electric energy of threephase asynchronous machine output is less than actual consumption electric energy, accordingly with this
Special woods engine retard.No matter threephase asynchronous machine is operated in motoring condition or generating state, controller controls two-way PWM
Inverter is exported after inversion is persistently carried out to DC bus-bar voltage to threephase asynchronous machine offer reactive power and control user
Side inverter continues to supply electricity to user after DC bus-bar voltage is carried out inversion, and accumulator on-line monitoring unit detects electric power storage in real time
Cell voltage, charging and discharging currents and battery temp parameter, when charging and discharging currents and battery temp exception or voltage are less than threshold
During value, that is, stop battery discharging, to avoid the battery damage thereby resulted in.When system starts, accumulator is to straight
Bus discharge is flowed, the DC bus-bar voltage that DC bus-bar voltage detection unit monitors at this time is more than initial voltage, and accumulator is defeated
The direct current energy gone out is exported by dc bus to two-way PWM inverter and user's side inverter, DC bus-bar voltage detection list
Member detects the DC voltage on dc bus with accumulator output and exports voltage signal to controller, controller control
Two-way PWM inverter is exported to threephase asynchronous machine after the voltage that dc bus transmits is carried out inversion for electric energy conversion
And the electricity for persistently providing reactive power for threephase asynchronous machine and user's side inverter being controlled to transmit dc bus
Continued power is to user after pressure carries out inversion.As the preferred embodiment of the present invention, the DC bus-bar voltage detection unit
It is preferred that using DC voltage transmitter.In addition accumulator on-line monitoring unit monitors battery tension, discharge current and temperature in real time
Degree when the battery tension detected is less than a certain threshold voltage, stops discharging and then accumulator being avoided to cross putting damage.It is two-way
PWM inverter exports AC energy to threephase asynchronous machine, and threephase asynchronous machine is operated in motoring condition and converts electrical energy into machine
Tool energy drives Stirling engine to complete self-starting, and is further driven to threephase asynchronous machine and transfers to be operated in generating state, will
Mechanical energy is converted to electric energy and is completed direct current electricity output to dc bus after rectification by two-way PWM inverter, controller according to
DC voltage transmitters sense to two-way PWM inverter export to the direct current of dc bus and accumulator on-line monitoring unit
It exports and charges a battery after the battery tension transformation transmitted, while accumulator on-line monitoring unit monitors electric power storage in real time
Voltage, charging current and the temperature in pond when the battery tension of detection reaches accumulator rated voltage, stop charging to accumulator
And then avoid overcharging, while controller by control unloading control unit completion unload charged current adjusting and electric power generation unloading resistance to direct current
The discharge of the extra electric energy of busbar.
The use process of the present invention is as follows：
When system starts, accumulator discharges to dc bus, and two-way PWM inverter uses constant voltage constant frequency control mode, presses
Start threephase asynchronous machine according to set voltage curve.Threephase asynchronous machine exports after receiving two-way PWM inverter ac converter
Electric energy and be converted into mechanical energy and drive Stirling motor to realize the self-starting of Stirling motor.Stirling-electric hybrid has started
Cheng Hou, two-way PWM inverter are still operated in inverter mode, to the three phase induction generator offer idle channel of sine wave, while by
In the change of voltage and current phase angle difference, current direction is with motor to based on dc bus direction.User's side inverter is voltage
Type passive inverter provides a user the three-phase alternating current of power frequency.At the same time, DC bus-bar voltage detection unit continuous collecting is female
Line voltage controls the size of charging current by controlling the height of charging voltage, the electric energy=charging for sending out generator
Electric energy+user's electric energy, so as to reach the balance of system.In addition Monitored System of Industrial Storage Cell detects accumulator status in real time, prevents from storing
The overcharging of battery, mistake is put and charging current is too big etc..When loading electricity consumption less than generated energy, busbar voltage can increase, charging
Electric current increases.Electricity consumption is loaded more than if generated energy, busbar voltage reduces, and accumulator can discharge.When accumulator is operated at full capacity
Afterwards, in the case of DC bus-bar voltage is still raised, discharging circuit is opened, discharging circuit size of current is adjustable, can when electric current is smaller
It works long hours, electric current is too big, then shuts down.User's side inverter realizes inversion of the direct current to exchange, is opening using switching tube
What logical and shutdown was formed, so it is not the sine wave of standard, in band inductive load, due to there is the presence of inductance, so not
It is impacted.But in band resistive load, waveform does not just become the sine wave of standard, needs to install wave filter and transformer ability additional
Provide the power supply for meeting power quality requirement to the user.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe is described in detail the present invention with reference to foregoing embodiments, it will be understood by those of ordinary skill in the art that：Its according to
Can so modify to the technical solution recorded in foregoing embodiments either to which part or all technical features into
Row equivalent replacement；And these modifications or replacement, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (6)
1. a kind of modified off-network Stirling electric power system structure, it is characterised in that including：
Stirling engine system；
Stirling engine system is connected, to the friendship when Stirling engine starts to being exported by Stirling engine system
Galvanic electricity can carry out DC inversion and the two-way PWM of the direct current energy of reception accumulator output is inverse before Stirling launching system starts
Become device；
Two-way PWM inverter is connected through dc bus, to store two-way PWM inverter in Stirling engine starting state
The direct current energy and Stirling of output start to provide the accumulator of direct current energy before starting to the two-way PWM inverter；
Dc bus is connected, to detect the DC bus-bar voltage detection unit of DC voltage；
Two-way PWM inverter and controller are connected by dc bus, for after two-way PWM inverter rectification or accumulator is defeated
The direct current energy gone out carries out user's side inverter of supply user after inversion；
Dc bus and electric power generation unloading resistance are connected respectively, to adjust the unloading control device of electric power generation unloading resistance；
Two-way PWM inverter, user's side inverter and DC bus-bar voltage detection unit are connected respectively, for according to dc bus
Voltage controls the controller of two-way PWM inverter, user's side inverter working condition.
2. a kind of modified off-network Stirling electric power system structure according to claim 1, it is characterised in that further include point
Not Lian Jie accumulator and controller, to monitor in real time accumulator status, ensure battery-operated safety accumulator it is online
Monitoring system.
A kind of 3. modified off-network Stirling electric power system structure according to claim 2, it is characterised in that the electric power storage
The state that pond on-line monitoring system monitors accumulator in real time includes at least battery tension, charging and discharging currents and battery temp.
4. a kind of modified off-network Stirling electric power system structure according to any one in claim 1-3, feature
It is that the controller connects accumulator on-line monitoring unit, DC bus-bar voltage detection unit and unloading control device respectively,
It is real-time that DC bus-bar voltage and accumulator for being transmitted according to DC bus-bar voltage detection unit monitor unit on-line
The accumulator status information transmitted controls signal to give unloading control device, realizes the work shape to electric power generation unloading resistance by transmission
State is adjusted.
5. a kind of modified off-network Stirling electric power system structure according to claim 1, it is characterised in that further include：
User's side inverter is connected, the direct current energy to be exported to user's side inverter carries out the wave filter of rectification；
It is connected between wave filter and user, to adjust the transformer of DC voltage.
6. a kind of modified off-network Stirling electric power system structure according to any one in claim 1,2,3 or 5,
It is characterized in that the Stirling engine system includes Stirling engine and threephase asynchronous machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721142322.5U CN207542779U (en) | 2017-09-07 | 2017-09-07 | A kind of modified off-network Stirling electric power system structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721142322.5U CN207542779U (en) | 2017-09-07 | 2017-09-07 | A kind of modified off-network Stirling electric power system structure |
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| CN207542779U true CN207542779U (en) | 2018-06-26 |
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| CN201721142322.5U Expired - Fee Related CN207542779U (en) | 2017-09-07 | 2017-09-07 | A kind of modified off-network Stirling electric power system structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109185088A (en) * | 2018-09-14 | 2019-01-11 | 甘炳春 | A kind of new energy engine based on Stirling external-burning engine |
-
2017
- 2017-09-07 CN CN201721142322.5U patent/CN207542779U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109185088A (en) * | 2018-09-14 | 2019-01-11 | 甘炳春 | A kind of new energy engine based on Stirling external-burning engine |
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Granted publication date: 20180626 Termination date: 20200907 |