CN101944745B - Energy storage system and control method thereof - Google Patents
Energy storage system and control method thereof Download PDFInfo
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- CN101944745B CN101944745B CN2010102737160A CN201010273716A CN101944745B CN 101944745 B CN101944745 B CN 101944745B CN 2010102737160 A CN2010102737160 A CN 2010102737160A CN 201010273716 A CN201010273716 A CN 201010273716A CN 101944745 B CN101944745 B CN 101944745B
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Abstract
The invention provides an energy storage system which comprises a controller, a main circuit, a push-pull converter, a cycloconverter, a filter inductor and a sampling circuit. The controller is used for controlling the generation of an SVPWM (Space Vector Pulse Width Modulation) signal and a PWM (Pulse Width Modulation) signal to obtain a discrete SVPWM signal, the main circuit comprises an energy storage device for storing and releasing electric energy, the push-pull converter comprises a high-frequency transformer and is boosted by adopting the high-frequency transformer to electrically isolate the input from the output of the energy storage system, the cycloconverter is used for converting a high-frequency alternating voltage into a power frequency alternating voltage, the filter inductor is used for filtering a grid current, and the sampling circuit is used for acquiring a voltage and a current of an external circuit. The energy storage system can generate discrete pulse-type SVPWM and has the advantages of higher utilization rate of the bus voltage, low total harmonic content and wide scope of application. The invention also provides a control method of the energy storage system.
Description
Technical field
The present invention relates to a kind of energy-storage system and control method, particularly relate to a kind of energy-storage system and control method of electrical network peak load shifting.
Background technology
Along with the development of power electronic technology, the purposes of energy-storage system is more and more wider, like uninterrupted power supply (ups) Unity, and the energy storage device of electric motor car and electrical network peak load shifting.Energy storage device gets up electrical power storage in low power consumption period (charging), in peak of power consumption period (discharge), discharges electric energy and supports electrical network.For the effect of the peak load shifting that can reach, the current transformer between energy storage device and the electrical network not only will have two-way unsteady flow ability, requires the quick response of unsteady flow simultaneously, and the unity power factor of system.
State Intellectual Property Office adopts buck type inverter as two way convertor in disclosed patent of in October, 2009 " energy storing device for supplying valley current at peak of current supply ", and energy storage device directly connects the inverter bus, and the output of inverter gets access to grid through passive filter, adopts SPWM control.Can the power factor correcting, but the buck inverter requires busbar voltage to be higher than ac output voltage, so this topology is not suitable for the energy storage device of low-voltage, like ultracapacitor.And there is not electrical isolation between electrical network and the energy storage device.IEEE Trans.on Power Electronics [power electronics periodical] has delivered " Three-Phase Boost-Type Grid-Connected Inverter " [three-phase boost type combining inverter] literary composition in 2008 the 5th phases; In the DC side loading; Constitute the booster type inverter, adopt the Cycle Control strategy, reduced dc voltage to a certain extent; But boost code converter boost capability is limited; Energy storage device to this ultralow pressure of super capacitor is still inapplicable, and adopts boost type inverter, has increased the total harmonic distortion (THD) of output current.
Summary of the invention
Technical problem to be solved by this invention provides the control method of a kind of energy-storage system and this energy-storage system, can be applicable to the energy storage device of low-voltage, uses extensively.
In order to address the above problem, the invention discloses a kind of energy-storage system, comprise that being used for control produces space vector pulse width modulation signal and pulse-width signal and obtain Discrete Space Vector pulse-width signal controller; Main circuit; This main circuit comprises the energy storage device that is used to store and discharge electric energy; Push-pull converter comprises high frequency transformer, adopts the high-frequency electrical depressor to boost electrical isolation is carried out in the input and output of energy-storage system; Convert high-frequency ac voltage into the frequency converter of industrial-frequency alternating current, the filter inductance that grid-connected current is carried out filtering; And the sample circuit that is used to gather line voltage and grid-connected current; Wherein, described controller comprises CPLD, and said space vector pulse width modulation signal and pulse-width signal carry out together through CPLD or logic obtains the Discrete Space Vector pulse-width signal.
Further; This controller comprises digital signal processing chip; This digital signal processing chip comprises task manager module EVA and task manager module EVB; Task manager module EVA is used to produce the space vector pulse width modulation signal, and it is 50% pulse-width signal that task manager module EVB is used to produce duty ratio.
Further, this task manager module EVA has first timer, and first timer adopts and increases the counting mode that afterwards subtracts earlier, and task manager module EVB has second timer, and second timer adopts the counting mode that singly increases.
Further; This push-pull converter also comprises first switching tube and second switch pipe; The positive pole of said energy storage device connects the centre tap on the former limit of high frequency transformer; Negative pole connects the source electrode or the emitter of first switching tube and second switch pipe respectively, and the secondary of high frequency transformer is connected with the bus of frequency converter.
Further, this first switching tube and second switch pipe are insulating gate type field effect tube or insulated gate bipolar transistor.
Further, this frequency converter is the three-phase frequency converter, is formed by connecting the mode of six bidirectional switchs by three phase full bridge.
Further, this bidirectional switch is by two insulating gate type field effect tubes or insulated gate bipolar transistor, is formed by connecting by the mode of common source or common emitter.
Adopt electric current loop decoupling zero control when further, this energy-storage system discharges and recharges.
The present invention also discloses a kind of control method of energy-storage system, comprising: the high frequency transformer in the push-pull converter inputs to frequency converter as busbar voltage after the boost in voltage of energy storage device is the high-frequency ac pulse; It is 50% pulse-width signal driving push-pull converter and the busbar voltage polarity that determines frequency converter that task manager module EVB produces duty ratio; Task manager module EVA produces the switch mode that the space vector pulse width modulation signal drives frequency converter and determines frequency converter; The busbar voltage of frequency converter is correct time; Drive signal is the space vector pulse width modulation signal; When busbar voltage was negative, drive signal was the negate of space vector pulse width modulation signal; After pulse-width signal and the space vector pulse width modulation signal Synchronization CPLD carry out with or logic obtain the Discrete Space Vector pulse-width signal.
Compared with prior art, the present invention has the following advantages:
Energy-storage system of the present invention adopts push-pull converter and frequency converter acting in conjunction, produces discrete pulse formula SVPWM, and the utilance of busbar voltage is higher, and total harmonic distortion is low.High frequency transformer through in the push-pull converter boosts, and electrical isolation is carried out in the input and output of whole energy-storage system, avoids interfering with each other between the circuit.In addition, because the boosting of high frequency transformer even energy storage device is a low-voltage, also can amplify it through high frequency transformer, so this kind energy-storage system also can be used for the energy storage device of low-voltage, and the scope of application is wider.
Description of drawings
Fig. 1 is the structural representation of the energy-storage system of the embodiment of the invention.
Fig. 2 is the structural representation of the main circuit of the embodiment of the invention.
Fig. 3 is the voltage vector space diagram of the discrete pulse formula SVPWM that produces in the energy-storage system of the embodiment of the invention.
Fig. 4 is the drive signal figure of discrete pulse formula SVPWM of first sector of voltage vector space diagram shown in Figure 3.
Fig. 5 is based on the current inner loop control chart of d-q coordinate transform.
Embodiment
For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, below in conjunction with accompanying drawing and embodiment the present invention done further detailed explanation.
Please, a kind of energy-storage system is shown, comprises controller 10, main circuit 30 and sample circuit 50 with reference to Fig. 1.
Please be simultaneously with reference to Fig. 2, main circuit 30 comprises energy storage device 31, push-pull converter 33, frequency converter 35 and filter inductance 37.In the present embodiment, energy storage device 31 is a super capacitor.Push-pull converter 33 comprises first switching tube 331, second switch pipe 333 and isolation type high frequency transformer 335.First switching tube 331 is a triode with second switch pipe 333, can be insulated gate bipolar transistor, also can be insulating gate type field effect tube.The former limit winding of high frequency transformer 335 is divided into N by centre tap
P1, N
P2, the secondary winding is N
S, N
P1: N
P2: N
S=1: 1: N.Filter inductance 37 is used for grid-connected current is carried out filtering, to reduce the harmonic content of grid-connected current.
The positive pole of energy storage device 31 connects the centre tap on high frequency transformer 335 former limits, and negative pole connects the emitter of first switching tube 331 and second switch pipe 333 respectively.The secondary of high frequency transformer 335 is connected with the bus of frequency converter 35.Frequency converter 35 is the three-phase frequency converter, by six bidirectional switch SW
1-SW
6Mode by three phase full bridge is formed by connecting.Bidirectional switch is in series by the mode that supplies emitter by the insulated gate bipolar transistor or the insulating gate type field effect tube of two N raceway grooves.Filter inductance 37 1 ends are connected with frequency converter 35, and the other end is connected with electrical network.
Please refer again to Fig. 1, sample circuit 50 comprises voltage sensor 51, current sensor 52, modulate circuit 53 and modulus conversion chip 55.In the present embodiment, voltage-current sensor 51 is a Hall element.Voltage sensor 51 line voltages; Current sensor 52 is used to detect grid-connected current; And the grid-connected current that detects of the line voltage that detects through voltage sensor 51 and current sensor 52 sends modulus conversion chip 55 to after all nursing one's health through modulate circuit 53, and modulus conversion chip 55 sends signal in the controller 10 digital signal processing chip 11 again.
See also Fig. 2 to Fig. 4, the control method that the discrete pulse formula SVPWM signal in the energy-storage system of the embodiment of the invention produces is for may further comprise the steps:
S101, the high frequency transformer 335 in the push-pull converter 33 input to frequency converter 35 as busbar voltage after the boost in voltage of energy storage device 31 is the high-frequency ac pulse.
It is 50% pulse-width signal driving push-pull converter and the busbar voltage polarity that determines frequency converter that S102, task manager module EVB produce duty ratio.
S103; Task manager module EVA produces the switch mode that the space vector pulse width modulation signal drives frequency converter and determines frequency converter; The busbar voltage of frequency converter is correct time; Drive signal is the space vector pulse width modulation signal, and when busbar voltage was negative, drive signal was the negate of space vector pulse width modulation signal.
S104, after pulse-width signal and the space vector pulse width modulation signal Synchronization CPLD carry out with or logic obtain the Discrete Space Vector pulse-width signal.
Be elaborated in the face of above-mentioned steps down, the upper and lower bridge arm on off state of frequency converter 35 is complementary, has eight kinds of switching modes (000), (001), (010), (011), (100), (101), (110) and (111).Wherein, (000) and (111) corresponding no-voltage vector, the corresponding nonzero voltage space vector of all the other six kinds of switching modes.Six nonzero voltage space vectors are divided into six sectors with the voltage vector space; When reference voltage is positioned at certain sector; According to the principle of SVPWM, can be through two adjacent on this sector borders voltage vectors and the alternating action synthesized reference voltage vector of two no-voltage vectors.The busbar voltage of frequency converter 35 is the high-frequency ac impulse wave, and under a kind of switching mode, when busbar voltage was respectively positive and negative, corresponding voltage vector was just opposite.Therefore, when busbar voltage is correct time, the drive signal of frequency converter 35 is traditional SVPWM signal, when busbar voltage when negative, the drive signal of frequency converter 35 is traditional SVPWM negate.Though this kind discrete pulse formula SVPWM synthesizes reference voltage vector through two nonzero voltage space vectors, reality has related to four kinds of switching modes because of the positive and negative difference of busbar voltage.Wherein, the busbar voltage polarity of frequency converter 35 is by the drive signal decision of push-pull converter 33, through the discrete pulse formula that realizes the synchronously SVPWM of frequency converter 35 and push-pull converter 33 drive signals.
In the digital signal processing chip 11 of controller 10, first timer 111 starts with second timer 115 simultaneously, and the PWM duty ratio of first switching tube 331 and second switch pipe 333 is 50%.Therefore increasing in the counting curve of first timer 111, the drive signal of two switching tubes 331,333 is (01), i.e. second switch pipe 333 conductings, at this moment, the busbar voltage of frequency converter 35 is for just.First timer 111 subtract between the count block in, the drive signal of two switching tubes 331,333 is (10), i.e. first switching tube, 331 conductings, at this moment, the busbar voltage of frequency converter 35 is for negative.Pwm signal and SVPWM signal are done in CPLD 13 together or logic, finally obtain discrete pulse formula SVPWM (DPSVPWM) (as shown in Figure 3).
Please refer again to Fig. 1, Fig. 2, Fig. 4 and Fig. 5, this kind energy-storage system is when discharge, and two way convertor works in inverter mode, is given with the electric current on the output inductor 37, the electric current of control input electrical network.At first, detect three phase network voltage, calculate the phase angle θ of electrical network through phase locked algorithm through the voltage sensor in the sample circuit 50 51.Detect output three-phase grid current i through current sensor 52
a, i
b, i
c, be converted into the i under the two phase rest frames through the Clark conversion then
α, i
β, utilize electrical network phase angle θ to be converted into the i under the two cordic phase rotators system again through the Park conversion
d, i
qUnder the d-q coordinate system; Grid-connected current is done ratio-integral control (PI control); Three symmetrical of acs are transformed into the d-q coordinate system of synchronous rotation down for constant, so can eliminate static receiver error with proportional-plus-integral controller, grid-connected current are followed the tracks of to given intersection of ideals flow floating.I in addition
dRepresent active current, i
qRepresent reactive current.Through control i
d, i
qCan make output power factor is 0～1 arbitrary value.To flow into electrical network is the electric current positive direction, during inversion, and i
dShould be greater than 0.Because finally be to control grid-connected current, so the d axis controller is output as u through the voltage drop that control is incorporated into the power networks on the inductance
q, the q axis controller is output as-u
du
d, u
qConvert u into through anti-Park conversion
α, u
β, the two with the busbar voltage of frequency converter 35 together as the input of discrete pulse formula SVPWM.Because the busbar voltage of frequency converter 35 is high-frequency ac impulse waves; Add the due to voltage spikes that high frequency transformer 335 leakage inductances cause; Its amplitude is difficult to by correct detecting; In the practical operation, through the voltage of voltage sensor senses DC side energy storage device 31, the turn ratio that multiply by high frequency transformer 335 then obtains frequency converter 35 busbar voltage amplitudes.In the inversion discharge process, the voltage of energy storage device 31 can constantly reduce, and when the voltage of energy storage device 31 is lower than certain value, stops inversion.
During charging, two way convertor works in the rectification pattern.Still control charge power through control grid side electric current, at this moment i
qBe given as negative, i
qBe given as 0.When the voltage of energy storage device 31 is higher than maximum charging voltage, i
qBe given as 0, stop charging.
The energy-storage system of the embodiment of the invention adopts push-pull converter 33 and frequency converter 35 actings in conjunction, produces discrete pulse formula SVPWM, and the utilance of busbar voltage is higher, and total harmonic distortion is low.Boost through the high frequency transformer in the push-pull converter 33 335, electrical isolation is carried out in the input and output of whole energy-storage system, avoid interfering with each other between the circuit.In addition, because the boosting of high frequency transformer 335 can make the voltage of energy storage device 31 be exaggerated; Even energy storage device 31 is a low-voltage; Also can amplify it through high frequency transformer 335, so this kind energy-storage system also can be used for the energy storage device 31 of low-voltage, the scope of application is wider.The frequency of the grid-connected current of boosting through high frequency transformer 335 is higher, carries out the harmonic content that filtering can reduce grid-connected current through 37 pairs of grid-connected current of filter inductance.
More than to a kind of energy-storage system provided by the present invention; Carried out detailed introduction; Used concrete example among this paper principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1. an energy-storage system is characterized in that, comprising:
Controller, control produces space vector pulse width modulation signal and pulse-width signal and obtains the Discrete Space Vector pulse-width signal; Said controller comprises CPLD, and said space vector pulse width modulation signal and pulse-width signal carry out together through CPLD or logic obtains the Discrete Space Vector pulse-width signal;
Main circuit comprises:
Energy storage device stores and the release electric energy;
Push-pull converter comprises high frequency transformer, adopts the high-frequency electrical depressor to boost electrical isolation is carried out in the input and output of energy-storage system;
Frequency converter converts high-frequency ac voltage into industrial-frequency alternating current;
Filter inductance carries out filtering to grid-connected current;
Sample circuit is gathered line voltage and grid-connected current.
2. energy-storage system as claimed in claim 1; It is characterized in that; Said controller comprises digital signal processing chip; This digital signal processing chip comprises task manager module EVA and task manager module EVB, and task manager module EVA is used to produce the space vector pulse width modulation signal, and it is 50% pulse-width signal that task manager module EVB is used to produce duty ratio.
3. energy-storage system as claimed in claim 2; It is characterized in that said task manager module EVA has first timer, first timer adopts and increases the counting mode that afterwards subtracts earlier; Task manager module EVB has second timer, and second timer adopts the counting mode that singly increases.
4. energy-storage system as claimed in claim 1; It is characterized in that; Said push-pull converter also comprises first switching tube and second switch pipe; The positive pole of said energy storage device connects the centre tap on the former limit of high frequency transformer, and negative pole connects the source electrode or the emitter of first switching tube and second switch pipe respectively, and the secondary of high frequency transformer is connected with the bus of frequency converter.
5. energy-storage system as claimed in claim 4 is characterized in that, said first switching tube and second switch pipe are insulating gate type field effect tube or insulated gate bipolar transistor.
6. energy-storage system as claimed in claim 4 is characterized in that, said frequency converter is the three-phase frequency converter, is formed by connecting the mode of six bidirectional switchs by three phase full bridge.
7. energy-storage system as claimed in claim 6 is characterized in that, said bidirectional switch is by two insulating gate type field effect tubes or insulated gate bipolar transistor, is formed by connecting by the mode of common source or common emitter.
8. energy-storage system as claimed in claim 4 is characterized in that, adopts electric current loop decoupling zero control when said energy-storage system discharges and recharges.
9. the control method of an energy-storage system is characterized in that, comprising:
High frequency transformer in the push-pull converter inputs to frequency converter as busbar voltage after the boost in voltage of energy storage device is the high-frequency ac pulse;
It is 50% pulse-width signal driving push-pull converter and the busbar voltage polarity that determines frequency converter that task manager module EVB produces duty ratio;
Task manager module EVA produces the switch mode that the space vector pulse width modulation signal drives frequency converter and determines frequency converter; The busbar voltage of frequency converter is correct time; Drive signal is the space vector pulse width modulation signal; When busbar voltage was negative, drive signal was the negate of space vector pulse width modulation signal;
After pulse-width signal and the space vector pulse width modulation signal Synchronization CPLD carry out with or logic obtain the Discrete Space Vector pulse-width signal.
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| CN107069824B (en) * | 2017-05-25 | 2023-04-11 | 沈阳清能院清洁能源有限公司 | Photovoltaic grid-connected high-efficiency energy storage and transmission system |
| CN113595118A (en) * | 2021-07-30 | 2021-11-02 | 西安热工研究院有限公司 | High-penetration active and reactive current control method for energy storage system |
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| US5172009A (en) * | 1991-02-25 | 1992-12-15 | Regents Of The University Of Minnesota | Standby power supply with load-current harmonics neutralizer |
| CN100499343C (en) * | 2007-04-04 | 2009-06-10 | 南京理工大学 | AC-AC three level AC-AC converter based on positive converter |
| CN101790827B (en) * | 2007-06-04 | 2013-06-12 | 可持续能源技术公司 | Prediction scheme for step wave power converter and inductive inverter topology |
| CN101188386A (en) * | 2007-11-26 | 2008-05-28 | 天津理工大学 | PWM current rectifying system based on DSP and CPLD |
| CN101557115A (en) * | 2009-05-15 | 2009-10-14 | 江苏省电力公司金湖县供电公司 | Energy storing device for supplying valley current at peak of current supply |
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