CN105515060A - Novel inverted power supply for distributed power generation system - Google Patents
Novel inverted power supply for distributed power generation system Download PDFInfo
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- CN105515060A CN105515060A CN201610010863.6A CN201610010863A CN105515060A CN 105515060 A CN105515060 A CN 105515060A CN 201610010863 A CN201610010863 A CN 201610010863A CN 105515060 A CN105515060 A CN 105515060A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a novel inverted power supply for a distributed power generation system. The novel inverted power supply is connected with a distributed power generation network at a point of common coupling, and comprises an inverter circuit, a voltage source inverter, an input current detecting circuit, a rectifying circuit, an output current detecting circuit, an output voltage detecting circuit and a control module. When the distributed power generation system supplies power which is smaller than the maximum rated active power of the network to the network, the control module serves as a static synchronous compensator to regulate voltage of the point of common coupling. When the inverter voltage of at least one distributed power generation system which can be operated to be connected with the network exceeds the power required by one or more loads in the network, the control module stops the voltage of the point of common coupling from exceeding rated voltage. The novel inverted power supply for the distributed power generation system solves the problems of harmonic distortion and serious magnetic biasing of the distributed power generation system in the prior art.
Description
Technical field
The present invention relates to power electronic equipment control technology field, particularly relate to a kind of inverter of new distribution type electricity generation system.
Background technology
Along with environmental problem and energy problem more and more receive publicity, distributed power generation, especially the development of regenerative resource distributed generation technology rapidly, becomes the prior development direction of various countries' energy resource supply.Traditional electrical network is by big power station's centralized power generation, each user is disperseed to use with being assigned to power delivery by electrical network, exist and establish network loss to lose greatly, power transmission and distribution high in cost of production problem, and regenerative resource usually to possess generated output density little, intermittent and randomness is large, traditional centralized power generation mode is adopted to need to take a large amount of areas, and due to generating intermittence make the scheduling of electric energy and conveying bring very large problem, often there is off-grid or abandon the situations such as electricity occurring, namely the safety of electrical network is impacted, not high to the utilization ratio of regenerative resource yet, therefore regenerative resource utilizes on a large scale and is relatively applicable to large-scale distributed forms of electricity generation.Distributed power generation form, entering after regenerative resource concentrates power station power generation mode, is all being widelyd popularize in current countries in the world.According to the form development distributed power generation of regenerative resource near user side, directly to customer power supply, without the need to through transmission and disttrbution process, greatly reduce power delivery loss, and the reliability of power supply can be improved.
The penetration degree of distributed generation system improves constantly, as the distributed generation system based on new forms of energy.Therefore, Utilities Electric Co. is also faced with because of the grid-connected huge challenge causing energy source increasing.Following challenge, as guaranteed the quality of power supply etc. in voltage regulation, the stability of a system and standard limited value, is these the very corns of a subject.
Flexible ac transmission system device proposes a feasible solution for these, and it is by the electric power system that is applied to more and more all over the world.Here, flexible ac transmission system device refers to the AC transmission system that combines with power electronic controller and other static controllers to improve controllability and power delivery capabilities.Flexible ac transmission system device is generally used for following purpose:
Control voltage: why say or control electric wire power transmission capacity, and anti-backflow, improve system transients stability limit value, improve system damping, reduce subsynchronous resonance, alleviate voltage instability, limiting short-circuit current, improve high voltage direct current transmission converter terminal capabilities, wind generator system is grid-connected.
In flexible ac transmission system device, for reach above-mentioned arbitrarily or the autotelic partial devices of institute or controller comprise exquisite reactive-load compensator, STATCOM etc.
STATCOM is a kind of parallel connection, can send and/or the reactive power compensator of absorbing reactive power, and its output can change, to control the design parameter of current coefficient.In general, STATCOM is a kind of solid-state switch converter, when its input electric energy or energy storage device feed, can independently send at its output or absorb controlled meritorious and reactive power.
In particular, STATCOM is the voltage source converter producing one group of three-phase alternating current output voltage from specific input direct voltage.Each output voltage is resisted with corresponding AC system arc in phase by a small electric and is attached thereto, and this impedance can be provided by the leakage inductance of interfacial reactor or coupling transformer.Direct voltage is provided by energy storage capacitor.
As everyone knows, in the prior art, STATCOM has gone out to realize to expect that reactive power is sent and absorbs by the voltage of voltage source converter and the electronics of current waveform.STATCOM is also by send at point of common coupling and absorbing reactive power provides voltage support, without the need to appearance reactor or capacitor bank.Therefore, the physical space that takies of STATCOM is less.
As everyone knows, STATCOM can improve Power System Performance in following:
Control voltage: increase or control wire current transmittability, and anti-backflow, system transients stability limit value is provided, improves system damping, reduce synchronous resonant, alleviate voltage instability, limiting short-circuit current, improve high voltage direct current transmission converter terminal capabilities, wind generator system is grid-connected, control voltage flickering, controls acrobatic skill power, the active power if desired in control connection circuit.
Idle and active power between STATCOM and alternating current system exchanges can independent of controlling separately on the one hand.If STATCOM has the energy storage equipment of suitable capacity, active power can be realized and send and to absorb and reactive power is sent and the combination in any absorbed.On this basis, can be designed some very effective control strategy is adjusted, to improve the limit of stability of transient state and dynamical system to meritorious and idle power output.
In existing current delivery and distribution system, the penetration degree of distributed power generation improves gradually, and this faces many technical challenges, and wherein one is the change of voltage along feeder line.Traditionally, the direction of flow of power is from power transmission network to the load be connected to distribution feeder.By adjusting sending end voltage at a place of feeder transmission or distribution feeder or many places or provide reactive power support, the problem that voltage declines with the length of feeder line effectively can be solved.Utilities Electric Co. adopts tap-changing transformer and difference capacitor bank that difference voltage is in standard limited value usually.
The distributed generation system that wind power plant controls can present a kind of interesting situation, particularly at night.Now, as long as nighttime wind speed is larger than daytime, wind turbine generator exports higher, and electrical load is just much smaller than the numerical value on daytime.These power that night, wind power plant increased cause a large amount of power reverse flow to main electrical network.Because existing distribution system all follows an important hypothesis in design and operation, both power always flowed to terminal use from main electrical network, and the situation of this power reverse flow causes feeder voltage to exceed normal rating.In some cases, voltage can exceed 5% of usual allowance limit.This is that company is unacceptable.
When distributed generation system more to feeder line increase, backward power flowing will face a huge challenge.Keep voltage in particular range, raise the quantity that directly affects and can get involved the distributed generation system of specific distribution network.When increasing extra wind-force wind energy turbine set in electrical network, Utilities Electric Co. by voltage regulating device expensive for AC transmission system controller flexible for installation of having to etc., as static acrobatic skill compensator or STATCOM, to address this problem.
In addition, for inverter power supply device, the magnetic bias of transformer is a large problem.Due to once reach capacity from magnetic bias, transformer will lose its function becomes short circuit load state, and overcurrent flows to the switch element of inverter circuit, damages switch element.Magnetic bias is produced due to a variety of causes such as the deviation of characteristic, the instability of feedback control system of the distortion, switch element etc. of load.Especially, your variable power source device nearest, also has operating frequency more than the situation of 100KHz, in the iron core of transformer, mostly uses the FERRITE CORE that loss is in high frequency few.But, FERRITE CORE due to the value of saturation flux density low, so magnetic bias just reaches capacity immediately a little, for this reason, in the inverter power supply device of high frequency, magnetic bias countermeasure is more important.
In actual applications, very power electronics load is all required that the power output of inverter circuit can obtain effectively and flexibly controlling, to meet unequally loaded demand.The power adjustments mode of inverter can be divided into two large classes: direct current Power Regulation and inversion Power Regulation.Direct current Power Regulation regulates the input voltage of inverter direct-flow side, reaches the object of regulating load power output.Current DC chopped-wave voltage-regulating Power Regulation is the major way of direct current Power Regulation.
The DC chopped-wave voltage-regulating mode that conventional inverter regulating power is taked, adopts buck circuit in DC bus side, regulates VD, realize the adjustment to power output by the size changing duty ratio.Adopt this conventional control mode, in load, voltage waveform is discontinuous square wave, the usual apparent load of current waveform and determining, therefore the shortcoming of conventional inverter is the sine being difficult to realize output current, therefore harmonic component is large, and power factor is low, is not suitable for Power Regulation on a large scale.
The parallel running of multiple stage spwm inverter power supply can expand the capacity of system, but also can form parallel redundant system to improve reliability and the maintainability of system.But, the parallel running relative difficulty of sinusoidal pulse width modulation inverter, because the frequency of the sinusoidal pulse width modulation inverter of all parallel runnings, phase place and amplitude all must be consistent, otherwise, very large circulation will be there is between each inverter, excessive circulation can make the burden of inverter, and the circulation dispersed will make system crash, cause power failure.
The parallel Operation Control mode of sinusoidal pulse width modulation inverter is generally divided into centralized control, master & slave control and without interconnecting signal line separate control solution.Existing centralized control needs to detect total load current, and by the signal of higher bandwidth, the information of load current is passed to all Inverters, this has had a strong impact on the dilatation of system, interconnective holding wire is there is in system, the reliability of system is reduced, and system is not redundancy, and could realize parallel running under the control of current distribution unit, once current distribution unit is damaged, system will be collapsed.
Compared with centralized control, master-slave control method has certain advantage, and it can not need the size detecting load current, makes system be easy to expansion capacity, and the control between inverter is not by the impact of inverter outlet line impedance, and the current-sharing effect of system is fine.But master-slave control method also has some shortcomings: the existence of primary module makes it not be a redundant system, once primary module breaks down, whole system will be paralysed, the stability of a system depends in parallel from number of modules, primary module and there is current command signal line between module, should not grow distance and lay, otherwise signal can large high attenuation, serious interference, phase place is seriously delayed.
With first two Parallel Control Method compare, do not need interconnected control signal without interconnecting signal line independence control mode, by the frequency of output voltage, amplitude droop control realizes dividing equally of load active power and reactive power, thus realizes dividing equally of load current.This mode is particularly useful for distributed generation system, but the impact of dividing equally by circuit impedance of reactive power is comparatively serious, if line impedance coupling is bad, then reactive power needed for load will can not get dividing equally very well, and institute requires very high to systems axiol-ogy, control precision in like fashion; And this mode is owing to adopting droop characteristic, electric voltage frequency, amplitude stability index that meeting sacrificial system exports.
Summary of the invention
The present invention, just based on above one or more problem, provides a kind of inverter of new distribution type electricity generation system, in order to solve the distributed generation system harmonic distortion existed in prior art, the problem that magnetic bias is serious.
Wherein, the inverter of described distributed generation system, is connected with distributed power generation network at point of common coupling place, comprises:
Inverter circuit, it converts DC power supply to high-frequency ac by multiple switch element;
Voltage inverter, described high-frequency ac transformation is the voltage being suitable for load by it;
Input electric cur-rent measure circuit, for detecting the input current value of described transformer;
Rectification circuit, for carrying out rectification to the high-frequency ac after described transformation, and is supplied to load;
Output current detection circuit, for detecting the output current value after described rectification;
Output voltage detecting circuit, for detecting the output voltage values after described rectification;
Control module, for when distributed generation system provides to network the power being less than the maximum rated active power of network, control module regulates the voltage of point of common coupling as STATCOM; When the inverter voltage of the distributed generation system that at least one is operatively connected on network exceeds the power in network needed for one or more load, described control module stops the voltage of described point of common coupling to exceed rated voltage.
Further, when the inverter voltage of described distributed generation system does not provide active power to network, described voltage inverter is used as STATCOM.
Further, described control module comprises:
Main control unit, for generation of digital control word, described digital control word comprises three different pieces and multiple controller, each controller generates the value for controlling distributed generation system inverter voltage difference in functionality, and the value of described difference in functionality is for generation of the signal proportional with difference in functionality desired signal; Wherein each controller is activated or forbidding by the different piece of described digital control word.
Further, the difference in functionality of the inverter of described distributed generation system comprises at least following one: regulate described PCC voltage, and the damping being controlled transmission of electricity transmission transient signal by dynamic reactive power is controlled; Regulate the voltage on DC bus, and diligent power is injected described transmission system.
Further, the specific different piece of described digital control word is multiplied with the value that described controller produces.
Further, also comprise: magnetic bias judging circuit, for judging the magnetic bias of described transformer when the input current value of described transformer becomes more than bias current fiducial value, and export magnetic bias judgment signal; And
Inhibit circuit, it forbids above-mentioned output modulation control terminating from the half period of the time point to predetermined reverse frequency that input above-mentioned magnetic bias judgment signal, and what make the switch element of above-mentioned inverter circuit is changed to cut-off state.
Further, also comprise:
Bias current reference generating circuit for generation of described bias current fiducial value is set;
Above-mentioned bias current reference generating circuit carries out sampling by each half period of above-mentioned reverse frequency to the input current of above-mentioned transformer and keeps, and the value after above-mentioned sampling keeps adds predetermined bias current value, produces the bias current fiducial value of each above-mentioned half period;
Described magnetic bias judging circuit compares the bias current fiducial value before the above-mentioned half period in the moment of the described input current value that detects and this detection.
Further, the input current value based on the above-mentioned half period makes above-mentioned bias current value change.
Further, the inverter of described distributed generation system is solar electricity generation field.
Further, the inverter of described distributed generation system is wind power plant.
The inverter of distributed generation system provided by the invention, by providing voltage control by more windy force generating system and to electricity/distribution network, controlling to increase firm power transmission limit value in transmission system by voltage control and Auxiliary Damping in electrical network.Simultaneously; input current value adding, default bias current is to calculate bias current fiducial value; if differentiate magnetic bias based on this bias current fiducial value calculated; just can differentiate magnetic bias before magnetic bias is carried out fully; owing to carrying out preventing magnetic bias process in the starting stage of magnetic bias; so just magnetic bias can be eliminated early, switch element not deterioration or the damage because of oversampling circuit of protection inverter circuit.
Accompanying drawing explanation
Fig. 1 is the inverter structural representation of a kind of new distribution type electricity generation system of the embodiment of the present invention one;
Fig. 2 is the structure principle chart with the voltage source inverter of DC bus electric capacity of the embodiment of the present invention two;
Fig. 3 is the magnetic bias judging circuit of the embodiment of the present invention two and the schematic diagram of bias current benchmark generation current.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.It should be noted that, if do not conflicted, each feature in the embodiment of the present invention and embodiment can be combined with each other, all within protection scope of the present invention.
Embodiment one
The embodiment of the present invention one provides a kind of inverter of new distribution type electricity generation system, is connected with distributed power generation network at point of common coupling place, and as shown in Figure 1, the inverter of described distributed generation system, comprising:
Inverter circuit 1, it converts DC power supply to high-frequency ac by multiple switch element;
Voltage inverter 2, described high-frequency ac transformation is the voltage being suitable for load by it;
Input electric cur-rent measure circuit 3, for detecting the input current value of described transformer;
Rectification circuit 4, for carrying out rectification to the high-frequency ac after described transformation, and is supplied to load;
Output current detection circuit 5, for detecting the output current value after described rectification;
Output voltage detecting circuit 6, for detecting the output voltage values after described rectification;
Control module 7, for when distributed generation system provides to network the power being less than the maximum rated active power of network, control module regulates the voltage of point of common coupling as STATCOM; When the inverter voltage of the distributed generation system that at least one is operatively connected on network exceeds the power in network needed for one or more load, described control module stops the voltage of point of common coupling to exceed rated voltage.
Wherein, when the inverter voltage of described distributed generation system does not provide active power to network, described voltage inverter is used as STATCOM.
As the preferred implementation of technique scheme, described control module comprises:
Main control unit, for generation of digital control word, described digital control word comprises three different pieces and multiple controller, each controller generates the value for controlling distributed generation system inverter voltage difference in functionality, and the value of described difference in functionality is for generation of the signal proportional with difference in functionality desired signal; Wherein each controller is activated or forbidding by the different piece of described digital control word.
Wherein: the difference in functionality of the inverter of described distributed generation system comprises at least following one: regulate described PCC voltage, the damping control of transmission of electricity transmission transient signal is controlled by dynamic reactive power; Regulate the voltage on DC bus, and diligent power is injected described transmission system.
The value that specific different piece and the described controller of described digital control word produce is multiplied.
As a preferred implementation of technique scheme, the inverter of described distributed generation system also comprises: magnetic bias judging circuit 8, for judging the magnetic bias of described transformer when the input current value of described transformer becomes more than bias current fiducial value, and export magnetic bias judgment signal; And
Inhibit circuit 9, it forbids above-mentioned output modulation control terminating from the half period of the time point to predetermined reverse frequency that input above-mentioned magnetic bias judgment signal, and what make the switch element of above-mentioned inverter circuit is changed to cut-off state.
As a preferred implementation of technique scheme, the inverter of described distributed generation system also comprises:
Bias current reference generating circuit 10 for generation of described bias current fiducial value is set;
Above-mentioned bias current reference generating circuit carries out sampling by each half period of above-mentioned reverse frequency to the input current of above-mentioned transformer and keeps, and the value after above-mentioned sampling keeps adds predetermined bias current value, produces the bias current fiducial value of each above-mentioned half period;
Described magnetic bias judging circuit 8 compares the bias current fiducial value before the above-mentioned half period in the moment of the described input current value that detects and this detection.
Wherein, the input current value based on the above-mentioned half period makes above-mentioned bias current value change.
In the present embodiment, the inverter of described distributed generation system can be solar electricity generation field, also can be wind power plant.
The inverter of distributed generation system provided by the invention, by providing voltage control by more windy force generating system and to electricity/distribution network, controlling to increase firm power transmission limit value in transmission system by voltage control and Auxiliary Damping in electrical network.Simultaneously; input current value adding, default bias current is to calculate bias current fiducial value; if differentiate magnetic bias based on this bias current fiducial value calculated; just can differentiate magnetic bias before magnetic bias is carried out fully; owing to carrying out preventing magnetic bias process in the starting stage of magnetic bias; so just magnetic bias can be eliminated early, switch element not deterioration or the damage because of oversampling circuit of protection inverter circuit.
Embodiment two
The embodiment of the present invention two provides a kind of inverter of new distribution type electricity generation system, is applicable to the inverter of any type/configuration.The point that light reaction solar electricity generation field is connected to feeder line/electrical network is called as point of common coupling.Fig. 2 is the detailed schematic diagram that light reaction solar electricity generation field is converted into the voltage source inverter with DC bus electric capacity.Voltage source inverter utilizes six semiconductor switchs (referring to igbt herein) to realize, and this inverter is connected to electrical network by interface tandem inductor and step-up transformer.
The operation principle using photovoltaic solar generating field to regulate point of common coupling voltage is below described.
In order to simplify, make following hypothesis:
First: resistance and the electric capacity of electric wire are left in the basket, load with very near distance join to solar electricity generation field, i.e. zero impedance between solar electricity generation field and load; Unity power factor load.
Second: load, contribute to polar plot to be reduced to load, and the voltage of point of common coupling is identical to solar electricity generation field with very near distance join.But for more complicated expression, the line impedance between point of common coupling and load should be included.In this case, the amplitude of load voltage phasor can be lower/higher, depends on that line length compares generation phase shift with the point of common coupling voltage of loads defining current amount.
In principle, when voltage is from rated value rising or when declining, the flexible ac transmission system device of peripheral hardware, as STATCOM, suitable reactive power will be injected, with the decline/rising of the voltage in limiting circuitry impedance, thus by near voltage resume to rated value.
When photovoltaic solar generating field injects reactive power as STATCOM, the voltage rise of point of common coupling.If but photovoltaic solar generating field as STATCOM absorbing reactive power time, the voltage drop of point of common coupling.Therefore, corresponding with the public point voltage measured value that is of coupled connections by control reactive power inject/absorption behavior will regulate point of common coupling voltage, and the preset value holding it in expection is constant.
Fig. 3 is the magnetic bias judging circuit of the present embodiment and the details figure of bias current benchmark generation current, magnetic bias judging circuit, there is absolute value circuit, comparison circuit, prevents biasing circuit and circuit for reversing from being formed, and, bias current reference generating circuit, by sample-and-hold circuit, bias current establishes decision-making circuit, and add circuit and phase-shift circuit are formed.
Sample-and-hold circuit is synchronized with the first output modulator control signal machine second and exports modulator control signal, carries out sampling keep the value of absolute value signal, it can be used as sampling inhibit signal to export.
Bias current initialization circuit, if determine predetermined bias current value.Add circuit adds the predetermined bias current value being related to that circuit configuration by bias current in the value of sampling inhibit signal, and exports additive signal.Once input additive signal, phase-shift circuit is synchronized with reverse frequency makes the additive signal phase delay half period, and exports as bias current reference signal.
The value of comparison circuit to the value of absolute value signal and bias current fiducial value compares, and when the value of absolute value signal is larger than bias current fiducial value, makes comparison signal become high level and exports.When comparison signal becomes high level, prevent the bias magnetic signal of biasing circuit from becoming high level and export.Until the half period of abridged reverse frequency terminates all to maintain output, then, circuit for reversing is sent out to turn and is prevented bias magnetic signal, and exports as magnetic bias judgment signal.
The foregoing is only embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. an inverter for new distribution type electricity generation system, is connected with distributed power generation network at point of common coupling place, it is characterized in that, the inverter of described distributed generation system, comprising:
Inverter circuit, it converts DC power supply to high-frequency ac by multiple switch element;
Voltage inverter, described high-frequency ac transformation is the voltage being suitable for load by it;
Input electric cur-rent measure circuit, for detecting the input current value of described transformer;
Rectification circuit, for carrying out rectification to the high-frequency ac after described transformation, and is supplied to load;
Output current detection circuit, for detecting the output current value after described rectification;
Output voltage detecting circuit, for detecting the output voltage values after described rectification;
Control module, for when distributed generation system provides to network the power being less than the maximum rated active power of network, control module regulates the voltage of point of common coupling as STATCOM; When the inverter voltage of the distributed generation system that at least one is operatively connected on network exceeds the power in network needed for one or more load, described control module stops the voltage of described point of common coupling to exceed rated voltage.
2. the inverter of distributed generation system as claimed in claim 1, is characterized in that:
When the inverter voltage of described distributed generation system does not provide active power to network, described voltage inverter is used as STATCOM.
3. the inverter of distributed generation system as claimed in claim 1, is characterized in that: described control module comprises:
Main control unit, for generation of digital control word, described digital control word comprises three different pieces and multiple controller, each controller generates the value for controlling distributed generation system inverter voltage difference in functionality, and the value of described difference in functionality is for generation of the signal proportional with difference in functionality desired signal; Wherein each controller is activated or forbidding by the different piece of described digital control word.
4. the inverter of distributed generation system as claimed in claim 3, is characterized in that:
The difference in functionality of the inverter of described distributed generation system comprises at least following one: regulate described PCC voltage, and the damping being controlled transmission of electricity transmission transient signal by dynamic reactive power is controlled; Regulate the voltage on DC bus, and diligent power is injected described transmission system.
5. the inverter of distributed generation system as claimed in claim 3, is characterized in that:
The value that specific different piece and the described controller of described digital control word produce is multiplied.
6. the inverter of distributed generation system as claimed in claim 3, it is characterized in that: also comprise: magnetic bias judging circuit, for judging the magnetic bias of described transformer when the input current value of described transformer becomes more than bias current fiducial value, and export magnetic bias judgment signal; And
Inhibit circuit, it forbids above-mentioned output modulation control terminating from the half period of the time point to predetermined reverse frequency that input above-mentioned magnetic bias judgment signal, and what make the switch element of above-mentioned inverter circuit is changed to cut-off state.
7. the inverter of distributed generation system as claimed in claim 6, is characterized in that: also comprise:
Bias current reference generating circuit for generation of described bias current fiducial value is set;
Above-mentioned bias current reference generating circuit carries out sampling by each half period of above-mentioned reverse frequency to the input current of above-mentioned transformer and keeps, and the value after above-mentioned sampling keeps adds predetermined bias current value, produces the bias current fiducial value of each above-mentioned half period;
Described magnetic bias judging circuit compares the described input current value that detects and the bias current fiducial value before the above-mentioned half period in this detection moment.
8. the inverter of distributed generation system as claimed in claim 7, is characterized in that: the input current value based on the above-mentioned half period makes above-mentioned bias current value change.
9. the inverter of the distributed generation system as described in as arbitrary in claim 1-8, is characterized in that: the inverter of described distributed generation system is solar electricity generation field.
10. the inverter of the distributed generation system as described in as arbitrary in claim 1-8, is characterized in that: the inverter of described distributed generation system is wind power plant.
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Cited By (2)
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| CN109863660A (en) * | 2016-10-17 | 2019-06-07 | 逸节电子有限公司 | By saving voltage using adaptive voltage control and peak value reduction to save the energy to the maximum extent in electricity usage point |
| CN112072902A (en) * | 2020-08-28 | 2020-12-11 | 宋喂 | High-frequency induction heating device |
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| CN109863660A (en) * | 2016-10-17 | 2019-06-07 | 逸节电子有限公司 | By saving voltage using adaptive voltage control and peak value reduction to save the energy to the maximum extent in electricity usage point |
| CN112072902A (en) * | 2020-08-28 | 2020-12-11 | 宋喂 | High-frequency induction heating device |
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