CN102624011A - Distributed generation reactive compensation device - Google Patents
Distributed generation reactive compensation device Download PDFInfo
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- CN102624011A CN102624011A CN2012101253713A CN201210125371A CN102624011A CN 102624011 A CN102624011 A CN 102624011A CN 2012101253713 A CN2012101253713 A CN 2012101253713A CN 201210125371 A CN201210125371 A CN 201210125371A CN 102624011 A CN102624011 A CN 102624011A
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- thyristor
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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
- Y02E40/20—Active power filtering [APF]
Abstract
The invention discloses a distributed generation reactive compensation device, relating to a grid compensation device and providing a distributed generation reactive compensation device which can operate stably and cannot generate resonance. The distributed generation reactive compensation device is provided with a thyristor controlled reactor, a fixed capacitor group, an active power filter and a control circuit, wherein the thyristor controlled reactor is directly connected with a power grid in parallel; the fixed capacitor group is connected with the active power filter in series and is then connected to the power gird; a driving pulse signal end of the control circuit is respectively connected with the thyristor controlled reactor and the active power filter. The control circuit can be provided with a grid voltage and current sampling circuit, a digital signal processing (DSP) controller, an IPM (Intelligent Power Module) driving circuit, a thyristor driving circuit, a liquid crystal display and a protection circuit.
Description
Technical field
The present invention relates to a kind of power network compensation device, especially relate to a kind of distributed power generation reactive power compensator.
Background technology
Along with the continuous growth of electricity needs, centralized big electrical network is able to fast development in the many decades in the past, becomes main supply of electric power channel.Yet also there are a lot of drawbacks in this powering mode: operation cost is high, and the control difficulty is big, is difficult to satisfy increasingly high fail safe of user and reliability requirement.Especially in recent years, take place in succession in the world wide several times after the large area blackout, the fragility of big electrical network fully comes out, and this makes distributed power generation come into one's own day by day.Distributed power generation generally be meant generated output at thousands of watts of miniaturizations, modularization, distributing to 50 megawatts, be arranged near the user the small power generation system that is connected to distribution system for user's power supply.Photovoltaic generation, wind power generation, fuel cell, miniature gas turbine, small-sized water power etc. are through long-term development, and price constantly reduces when making great progress technically, and this universal providing for distributed power generation maybe.
Distributed power generation itself can produce a large amount of gaining merit with idle; Particularly small-sized water power, wind power generation and the photovoltaic generation of comparative maturity; Its ability energy source has the characteristics of randomness and instantaneity; Can not produce stable meritorious and reactive power, this just has been equivalent to get involved in the system a large-scale load at random.The startup of these generator units and shut down also and will cause bigger meritorious and idle fluctuation to electrical network, these all can cause the waveform that inserts out line voltage, and the stable generation of electric power system is had a strong impact on.Overcome the above problems the most effective measure and carry out reactive power compensation in distributed power generation unit and electrical network access point exactly; Guarantee that the idle of access point is stabilized in certain scope; To reduce the reactive power impact that possibly cause electrical network; Thereby give full play to the ability of the meritorious output of distributed power source, improve the quality of power supply of electric power system.
Reactive-load compensation equipment commonly used has compensator, synchronous generator, SVC and static reacance generator etc.Compensation equipment such as compensator and synchronous generator belongs to slewing, and loss and noise are all very big, and the static reacance generator cost is high, needs external power supply, and therefore above-mentioned three kinds of equipment all are not suitable for distributed power generation is carried out reactive power compensation.SVC is to be used as many shunt compensation equipment in the present electric power system, and it comprises forms such as fixed capacitor group, parallel transductor, thyristor-controlled reactor, thyristor switchable capacitor.In the various structures of SVC; Fixed capacitor group and thyristor-controlled reactor are joined together to use the more a kind of form that is to use; Wherein capacitive branch is for being fixedly connected; The thyristor-controlled reactor branch road adopts trigger delay control to form the inductive reactance of continuous controllable system, and the capacity of thyristor-controlled reactor is idle to guarantee that technical ability output capacitive reactive power also can be exported perception greater than the capacity of fixed capacitor group usually.Thyristor-controlled reactor can produce a large amount of harmonic currents in the practical application in compensating reactive power; Therefore must in this structure, dispose the passive filter group to eliminate this harmonic wave ([1] Jiang Qirong; Xie Xiaorong; Chen Jianye. electric power system shunt compensation [M]. Beijing: China Machine Press, 2004).Advantage such as that passive filter has is simple in structure, equipment investment is less, operating cost is lower; But also have some inextirpable shortcomings: compensation effect has dependence to load; Use underaction; Cause series connection and parallel resonance etc. easily, these shortcomings have greatly influenced the stability of a whole set of reactive power compensator.
Active Power Filter-APF is monitored electrical network in real time, when detecting system harmonics to system inject one group with it the electric current of opposite sign but equal magnitude offset harmonic current, thereby suppress harmonic distortion.The Active Power Filter-APF of the reactive power compensator of existing improved fixed capacitor group and thyristor-controlled reactor combination can overcome shortcoming ([2] Deng Likuan of the above-mentioned passive filter of mentioning; Jiang Xinjian; Zhu Dongqi; Stable control [J] Deng .APF and SVC cooperation. Automation of Electric Systems .2005,29 (18): 29-32).But in this case, the electric pressure that the switching device of Active Power Filter-APF bears need be greater than line voltage, and this has improved the cost of a whole set of reactive power compensator, so cost performance is not high.
Summary of the invention
The objective of the invention is to the above-mentioned deficiency that exists to existing generating reactive power compensator, a kind of distributed power generation reactive power compensator that can stable operation can not produce resonance is provided.
The present invention is provided with thyristor-controlled reactor, fixed capacitor group, Active Power Filter-APF and control circuit; Said brake tube control reactor directly parallel connection inserts electrical network; Parallel connection inserted electrical network after the fixed capacitor group was connected with Active Power Filter-APF, and the drive pulse signal end of control circuit connects thyristor-controlled reactor and Active Power Filter-APF respectively.
Said control circuit can be provided with line voltage current sampling circuit, Digital Signal Processing dsp controller, IPM drive circuit, thyristor driving circuit, LCD and protective circuit; The line voltage current sampling circuit is isolated sampling through Hall element to the line voltage electric current; Line voltage current sampling circuit output termination Digital Signal Processing dsp controller input; The angle of flow signal output part of Digital Signal Processing dsp controller connects the thyristor driving circuit input, the IPM pulse drive signal output termination IPM drive circuit input of Digital Signal Processing dsp controller; The input of LCD and the input of protective circuit connect the output of Digital Signal Processing dsp controller respectively, and LCD is responsible for present system running state is shown; Protective circuit is kept watch on the line voltage electric current and is handled with the output signal and to abnormal conditions.
Said thyristor-controlled reactor can be made up of hollow reactance and two-way admittance thyristor, and the angle of flow of two-way admittance thyristor is produced by control circuit and exports through thyristor driving circuit; Said fixed capacitor group can be the self-healing electric capacitor; Said Active Power Filter-APF is made up of three-phase six pipe SPM IPM, and the dc terminal of IPM inserts a big electric capacity in order to keep this dc voltage stability.
Said thyristor-controlled reactor is used to produce continuously adjustable lagging reactive power, and the fixed capacitor group is used to produce fixing capacitive reactive power, can produce continuously adjustable perception or capacitive reactive power so both are used; Active Power Filter-APF is used to eliminate the harmonic current that thyristor-controlled reactor produces; The present invention is installed in the interface of photovoltaic generation, wind power generation, small power station's distributed generating and electrical network, can keep the reactive power of interface stable, thereby avoids randomness and the intermittent voltage ripple of power network that is caused because of distributed power generation; Because of the existence of Active Power Filter-APF, avoid the resonance of issuable fixed capacitor group and electrical network simultaneously, improved the stability of system.
On control strategy,, Active Power Filter-APF is adopted harmonic wave frequency division detection algorithm for weakening the coupling between Active Power Filter-APF and the thyristor-controlled reactor; Simultaneously because be used for distributed power generation and electrical network interface; Line voltage is to change; Be to strengthen the current tracking ability of Active Power Filter-APF, in its control strategy, introduce the voltage feed-forward control algorithm, make the output current of Active Power Filter-APF not receive the influence of node place line voltage.
Advantage of the present invention and good effect are:
1. under the effect of control circuit; Thyristor-controlled reactor can produce continuously adjustable lagging reactive power; Under the acting in conjunction of the idle nonadjustable capacitive reactive power that produces with the fixed capacitor group of this perception; The present invention can produce continuously adjustable capacitive reactive power or lagging reactive power in a certain size scope, can be according to being compensated targetedly by the reactive power characteristics of compensation equipment.
2. in the present invention; The fixed capacitor group is connected back and is connected into electrical network with Active Power Filter-APF; Because of the existence of fixed capacitor group, the fundamental voltage that Active Power Filter-APF is born reduces greatly like this, and this makes the electric pressure of the electronic power switch device that Active Power Filter-APF adopted descend; Greatly reduced the cost of active filter, made system have more cost performance.
3. in the present invention, the output inductor of fixed capacitor group and Active Power Filter-APF constitutes single tuned filter at 7 power network current harmonic wave place resonance, and this single tuned filter can absorb electrical network 7 subharmonic currents.
4. in the present invention,, improved the stability of system because the existence of Active Power Filter-APF under the effect of its damping system vibration, has been avoided the resonance of issuable fixed capacitor group and electrical network.
5. in the present invention; Active Power Filter-APF both can absorb the harmonic current of local load generating; Also can absorb the harmonic current that thyristor-controlled reactor produces; Exempted conventional thyristor-controlled reactor and need carry the shortcoming that passive power filter carries out harmonic filtration, it is little therefore to make whole system have floor space, compensation power density advantages of higher.
Description of drawings
Fig. 1 is the composition frame chart of the embodiment of the invention.
Fig. 2 is the control circuit composition frame chart of the embodiment of the invention.
Fig. 3 is thyristor-controlled reactor 1, the fixed capacitor group 2 of the embodiment of the invention, the circuit diagram of Active Power Filter-APF 3.
Fig. 4 is the control block diagram of the Active Power Filter-APF of the embodiment of the invention.
Fig. 5 is the emulation example current waveform of the embodiment of the invention.In Fig. 5, abscissa is time t/s, and ordinate is electric current I/A.
Embodiment
Below in conjunction with accompanying drawing the present invention is described further.
Referring to Fig. 1; The embodiment of the invention is provided with thyristor-controlled reactor 1, fixed capacitor group 2, Active Power Filter-APF 3 and control circuit 4; Said brake tube control reactor 1 directly parallel connection inserts electrical network A and distributed power generation unit F; Parallel connection inserted electrical network A and distributed power generation unit F after fixed capacitor group 2 was connected with Active Power Filter-APF 3, and the drive pulse signal end of control circuit 4 connects thyristor-controlled reactor 1 and Active Power Filter-APF 3 respectively.
Fig. 2 provides the control circuit composition frame chart of the embodiment of the invention; Said control circuit can be provided with line voltage current sampling circuit 41, Digital Signal Processing dsp controller 42, IPM drive circuit 43, thyristor driving circuit 44, LCD 45 and protective circuit 46; Line voltage current sampling circuit 41 is isolated sampling through Hall element to the line voltage electric current; Line voltage current sampling circuit 41 output termination Digital Signal Processing dsp controllers 42 inputs; The angle of flow signal output part of Digital Signal Processing dsp controller 42 connects thyristor driving circuit 44 inputs, IPM pulse drive signal output termination IPM drive circuit 43 inputs of Digital Signal Processing dsp controller 42; The input of the input of LCD 45 and protective circuit 46 connects the output of Digital Signal Processing dsp controller 42 respectively, and LCD 45 is responsible for present system running state is shown; Protective circuit 46 is kept watch on the line voltage electric current and is handled with the output signal and to abnormal conditions.
Fig. 3 provides thyristor-controlled reactor, the fixed capacitor group of the embodiment of the invention, the circuit diagram of Active Power Filter-APF.Wherein thyristor-controlled reactor is made up of hollow reactance and two-way admittance thyristor, and the angle of flow of two-way admittance thyristor is produced by control circuit and provides through thyristor driving circuit; The fixed capacitor group is the self-healing electric capacitor; Active Power Filter-APF is made up of three-phase six pipe SPM IPM, and the dc terminal of IPM inserts a big electric capacity in order to keep this dc voltage stability.In Fig. 3, flag F is the distributed power generation unit.
Fig. 4 provides the control block diagram of the Active Power Filter-APF of the embodiment of the invention.
The fixed capacitor group is connected back and is connected into electrical network with Active Power Filter-APF; Thyristor-controlled reactor is direct and connect into electrical network, and control circuit is gathered the line voltage current signal and produced the work that driving pulse is controlled Active Power Filter-APF and thyristor-controlled reactor through the control corresponding algorithm.In Fig. 4, mark B is Sin and Cos generator, and D is a voltage feed-forward control.
The fixed capacitor group is used to produce the uncontrollable capacitive reactive power of fixed size.Thyristor-controlled reactor produces big or small continuously adjustable lagging reactive power in the certain limit under the control of the thyristor angle of flow, the response time is a few tens of milliseconds, is swift in response.Therefore, fixed capacitor group and thyristor-controlled reactor can produce continuously adjustable perception or capacitive reactive power in the certain limit when being used; This device is installed in the interface of photovoltaic generation, wind power generation, small power station's distributed generating and electrical network; Can keep the reactive power of interface stable; This reactive power is in order to the line voltage of support distribution formula generating access point, thereby avoids the randomness and the intermittent voltage ripple of power network that is caused because of distributed power generation.
In practical application, thyristor-controlled reactor is because the difference of the angle of flow can produce different harmonic currents, and these harmonic currents can cause fixed capacitor group and electrical network to produce resonance, and this can have a strong impact on power system security.With Active Power Filter-APF be connected on the fixed capacitor group below, again the fixed capacitor group is connected in parallel on the electrical network then, can utilize the damping action of Active Power Filter-APF to electrical network vibration, prevent capacitor group and electrical network generation resonance.Active Power Filter-APF is one three leg inverter, and its output inductor and fixed capacitor group are tuned at certain fundamental frequency place, constitutes single tuned filter.Because the electrical network fundamental voltage that the existence of this fixed capacitor group, Active Power Filter-APF are born reduces greatly, so the switch element in the active filter can adopt low pressure grade element; Absorbed by single tuned filter owing to a large amount of harmonic waves simultaneously; Therefore active filter only need absorb the harmonic wave that single tuned filter does not have absorption or do not absorb fully; So only need one very the Active Power Filter-APF of low capacity just can realize compensation to the larger capacity harmonic source, so the switch element in the active filter only need adopt the element that bears less electric current to get final product.For example, when this device was installed in distributed power generation 10Kv and is incorporated into the power networks side, the switch element that this Active Power Filter-APF adopted can be merely 1200V grade IPM module, and needn't adopt high pressure IGBT, has not only improved the stability of a system but also reduced system cost.
Can interact when Active Power Filter-APF and thyristor-controlled reactor cooperation, possibly cause system unstable.Can know through analyzing both interactive approach, when active electric-power filter adopts the control strategy that conventional Ip-Iq detection method constituted and the thyristor-controlled reactor degree of coupling big; And little with the thyristor-controlled reactor degree of coupling when adopting the harmonic wave frequency division to detect, this moment, the input of Active Power Filter-APF did not have to influence to the stability of a system basically.The installation site of considering Active Power Filter-APF simultaneously distributed power generation and network interface, so the tie point voltage ripple of power network is frequently and more obvious, therefore needs to introduce the electric voltage feed forward link with the influence of thorough elimination voltage fluctuation to Active Power Filter-APF.Control strategy block diagram in conjunction with above analysis obtains Active Power Filter-APF is as shown in Figure 4.
Fig. 5 is emulation example U phase current waveform.Can know that by Fig. 5 the harmonic current of thyristor-controlled reactor is absorbed under the effect of Active Power Filter-APF, thereby guarantee the quality of grid-connected current.
Claims (5)
1. distributed power generation reactive power compensator; It is characterized in that being provided with thyristor-controlled reactor, fixed capacitor group, Active Power Filter-APF and control circuit; Said brake tube control reactor directly parallel connection inserts electrical network; Parallel connection inserted electrical network after the fixed capacitor group was connected with Active Power Filter-APF, and the drive pulse signal end of control circuit connects thyristor-controlled reactor and Active Power Filter-APF respectively.
2. a kind of distributed power generation reactive power compensator as claimed in claim 1; It is characterized in that said control circuit is provided with line voltage current sampling circuit, Digital Signal Processing dsp controller, IPM drive circuit, thyristor driving circuit, LCD and protective circuit; The line voltage current sampling circuit is isolated sampling through Hall element to the line voltage electric current; Line voltage current sampling circuit output termination Digital Signal Processing dsp controller input; The angle of flow signal output part of Digital Signal Processing dsp controller connects the thyristor driving circuit input, the IPM pulse drive signal output termination IPM drive circuit input of Digital Signal Processing dsp controller; The input of LCD and the input of protective circuit connect the output of Digital Signal Processing dsp controller respectively.
3. a kind of distributed power generation reactive power compensator as claimed in claim 1; It is characterized in that said thyristor-controlled reactor is made up of hollow reactance and two-way admittance thyristor, the angle of flow of two-way admittance thyristor is produced by control circuit and through thyristor driving circuit output.
4. a kind of distributed power generation reactive power compensator as claimed in claim 1 is characterized in that said fixed capacitor group is the self-healing electric capacitor.
5. a kind of distributed power generation reactive power compensator as claimed in claim 1 is characterized in that said Active Power Filter-APF is made up of three-phase six pipe SPMs.
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| CN2012101253713A CN102624011A (en) | 2012-04-26 | 2012-04-26 | Distributed generation reactive compensation device |
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| CN2012101253713A CN102624011A (en) | 2012-04-26 | 2012-04-26 | Distributed generation reactive compensation device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219733A (en) * | 2013-03-18 | 2013-07-24 | 辽宁省电力有限公司电力科学研究院 | Scattered power generation reactive compensation device and method with harmonic suppression function |
| CN105226930A (en) * | 2015-09-23 | 2016-01-06 | 北京能高自动化技术股份有限公司 | A kind of reactive power control method being applied to grid-connected current transformer |
| CN106208059A (en) * | 2016-07-28 | 2016-12-07 | 华北电力大学（保定） | Adjustable impedance formula distributed photovoltaic power generation cluster resonance inhibiting system and suppressing method |
| CN106527648A (en) * | 2016-10-25 | 2017-03-22 | 郑州云海信息技术有限公司 | Power supply device and method of server |
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| CN101183791A (en) * | 2007-12-19 | 2008-05-21 | 湖南大学 | Static reactive compensator and active power filter combined operation system and control method thereof |
| CN201726143U (en) * | 2010-07-31 | 2011-01-26 | 哈尔滨威瀚电气设备股份有限公司 | Tapf |
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| JPH09215196A (en) * | 1996-01-29 | 1997-08-15 | Meidensha Corp | Power factor improving system connected in parallel with active filter |
| CN101183791A (en) * | 2007-12-19 | 2008-05-21 | 湖南大学 | Static reactive compensator and active power filter combined operation system and control method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219733A (en) * | 2013-03-18 | 2013-07-24 | 辽宁省电力有限公司电力科学研究院 | Scattered power generation reactive compensation device and method with harmonic suppression function |
| CN105226930A (en) * | 2015-09-23 | 2016-01-06 | 北京能高自动化技术股份有限公司 | A kind of reactive power control method being applied to grid-connected current transformer |
| CN105226930B (en) * | 2015-09-23 | 2018-04-13 | 北京能高自动化技术股份有限公司 | A kind of reactive power control method applied to grid-connected current transformer |
| CN106208059A (en) * | 2016-07-28 | 2016-12-07 | 华北电力大学（保定） | Adjustable impedance formula distributed photovoltaic power generation cluster resonance inhibiting system and suppressing method |
| CN106208059B (en) * | 2016-07-28 | 2019-02-26 | 华北电力大学（保定） | Adjustable impedance formula distributed photovoltaic power generation cluster resonance inhibiting system and suppressing method |
| CN106527648A (en) * | 2016-10-25 | 2017-03-22 | 郑州云海信息技术有限公司 | Power supply device and method of server |
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Application publication date: 20120801 |