CN104953597A - Intelligent electric meter system with function of improving quality of electric energy - Google Patents
Intelligent electric meter system with function of improving quality of electric energy Download PDFInfo
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- CN104953597A CN104953597A CN201510338032.7A CN201510338032A CN104953597A CN 104953597 A CN104953597 A CN 104953597A CN 201510338032 A CN201510338032 A CN 201510338032A CN 104953597 A CN104953597 A CN 104953597A
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- insulated gate
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- electric meter
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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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- 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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses an intelligent electric meter system with a function of improving the quality of electric energy. The intelligent electric meter system comprises an intelligent electric meter body, wherein the intelligent electric meter body is connected between a line-side single-phase alternating-current power supply and a load, a voltage sensor A is further connected in parallel between a firing line and a zero line between the line-side single-phase alternating-current power supply and the intelligent electric meter body, the intelligent electric meter body structurally comprises a control system which is further connected with a switched capacitor and a single-phase voltage source converter, the switched capacitor comprises three groups of switching circuits which are respectively connected in parallel between the firing line and the zero line of the line-side single-phase alternating-current power supply, each group of the switching circuit is formed in a way that a relay and a capacitor are connected in series, the relay is connected to the firing line, the capacitor is connected to the zero line, and a current sensor A is further connected to the firing line between the switched capacitor and the load. According to the intelligent electric meter system, the problems that a large number of social resources are consumed in compensation capacity, equipment size and personnel assignment and the power supply of power grids is not flexible in the prior art are solved.
Description
Technical field
The invention belongs to intelligent electric meter technical field, be specifically related to a kind of to there is the intelligent electric meter system improving quality of power supply function.
Background technology
Since calendar year 2001, the U.S. proposed the concept of intelligent grid, intelligent grid has become the development trend of power industry.The demand for development of intelligent grid improves the control to the quality of power supply, and intelligent electric meter is the important step that smart electric grid system is built.The function of what existing intelligent electric meter mainly realized is electric energy metrical, step price, the clearing electricity charge, part can carry out Power Quality Detection, and the research project that the element improving this two categorles power grid construction of the quality of power supply and intelligent electric meter combines is had not yet to see maturation.
Along with the development of science and technology, various miscellaneous household electrical appliance enter family continuously, and the power load of every household is constantly increased.The household electrical appliance such as similar air-conditioning, refrigerator, roaster, microwave oven often comprise the nonlinear circuit such as uncontrollable rectification circuit and Large Copacity filter capacitor, a large amount of harmonic waves is made to flow into electrical network, reduce the production of electric energy, transmission and utilization ratio, greatly reduce the life-span of electric equipment simultaneously.Some housed devices comprising transformer, motor etc. need reactive power when running.If do not take Measures of Reactive Compensation, then can increase line loss, cause voltage deviation, very serious impact is caused on network system.At present mainly three-phase side is concentrated on to the improvement of electrical network, as transformer station, distribution substation, such that no matter electrical network aspect is compensation capacity, equipment volume, personnel assignment all consume a large amount of social resources, and underaction.
Summary of the invention
The object of this invention is to provide and a kind of there is the intelligent electric meter system improving quality of power supply function, solve compensation capacity in the mains supply existed in prior art, equipment volume, personnel assignment consume a large amount of social resources, and the problem of power supply underaction.
The technical solution adopted in the present invention is, a kind of have the intelligent electric meter system improving quality of power supply function, comprises the intelligent electric meter body be connected between net side single phase alternating current power supply and load.
Feature of the present invention is also,
The structure of intelligent electric meter body is: comprise control system, control system is also connected with switched capacitor, single-phase electricity potential source type current transformer, also be connected with voltage sensor A between live wire between single-phase electricity potential source type current transformer and net side single phase alternating current power supply and zero line, the live wire between switched capacitor and load is also connected with current sensor A.
Switched capacitor concrete structure is: comprise the three groups of switching circuits between live wire and zero line being connected to net side single phase alternating current power supply, often organize switching circuit and be made up of relay and capacitances in series, relay is connected on live wire, and electric capacity is connected on zero line.
The concrete structure of single-phase electricity potential source type current transformer is: comprise the insulated gate gate transistors A be connected on live wire, the emitter of insulated gate gate transistors A is connected with live wire, also inductance L is connected with in turn between the emitter of insulated gate gate transistors A and live wire, current sensor B and current sensor C, the emitter of insulated gate gate transistors A is also connected with the collector electrode of insulated gate gate transistors B, the emitter of insulated gate gate transistors B emitter and insulated gate gate transistors D, the collector electrode of insulated gate gate transistors C is connected with the collector electrode of insulated gate gate transistors A, the emitter of insulated gate gate transistors C is connected with the collector electrode of insulated gate gate transistors D, the emitter of insulated gate gate transistors C is also connected with zero line, electric capacity C0 is also connected with between the collector electrode of insulated gate gate transistors C and the emitter of insulated gate gate transistors B, the upper of electric capacity C0 is also parallel with voltage sensor B.
Control system concrete structure is: comprise dsp chip, dsp chip is connected with LCDs and relay respectively, and dsp chip is also all connected with the gate pole of insulated gate gate transistors A, insulated gate gate transistors B, insulated gate gate transistors C, insulated gate gate transistors D.
The invention has the beneficial effects as follows, a kind of have the intelligent electric meter system improving quality of power supply function, and the effect of switched capacitor reduces the capacity of single-phase electricity source converter while being to increase power system capacity, reduce the voltage withstand class of device, reduce cost.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation with the intelligent electric meter system improving quality of power supply function of the present invention;
Fig. 2 is a kind of Control system architecture schematic diagram with the intelligent electric meter system improving quality of power supply function of the present invention;
Fig. 3 is a kind of single-phase electricity potential source type current transformer control block diagram with the intelligent electric meter system improving quality of power supply function of the present invention;
Fig. 4 is a kind of Current Detection Algorithm block diagram based on time domain with the intelligent electric meter system improving quality of power supply function of the present invention.
In figure, 1. net side single phase alternating current power supply, 2. intelligent electric meter body, 3. load, 4. switched capacitor, 5. single-phase electricity potential source type current transformer, 6. control system, 7. insulated gate gate transistors A, 8. insulated gate gate transistors B, 9. insulated gate gate transistors C, 10. insulated gate gate transistors D, 11.DSP chip, 12. voltage sensor B, 13. voltage sensor A, 14. current sensor B, 15. current sensor A, 16. switching circuits, 17. relays, 18. LCDs, 19. current sensor C.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The present invention combines the concept of technical field and the traditional intelligence ammeter improving the quality of power supply, the intelligent electric meter proposed adopts static reacance generator (Static Var Generator, SVG) with active filter (Active Power Filter, APF) mode combined, there is compensating reactive power and harmonic inhabitation function, not only can realize the function of electric energy metrical, the clearing electricity charge, dynamic passive compensation and harmonic wave control can also be carried out in real time, be intended to share electrical network pressure.
The present invention is a kind of has the intelligent electric meter system improving quality of power supply function, structural representation as shown in Figure 1, comprise the intelligent electric meter body 2 be connected between net side single phase alternating current power supply 1 and load 3, the structure of intelligent electric meter body 2 is: comprise control system 6, control system 6 also with switched capacitor 4, single-phase electricity potential source type current transformer 5 connects, voltage sensor A13 is also connected with between live wire between single-phase electricity potential source type current transformer 5 and net side single phase alternating current power supply 1 and zero line, live wire between switched capacitor 4 and load 3 is also connected with current sensor A15, switched capacitor 4 concrete structure is: comprise the three groups of switching circuits 16 between live wire and zero line being connected to net side single phase alternating current power supply 1, often organize switching circuit 16 to be composed in series by relay 17 and electric capacity C1, relay 17 is connected on live wire, electric capacity C1 is connected on zero line, the concrete structure of single-phase electricity potential source type current transformer 5 is: comprise the insulated gate gate transistors A7 be connected on live wire, the emitter of insulated gate gate transistors A7 is connected with live wire, also inductance L is connected with in turn between the emitter of insulated gate gate transistors A7 and live wire, current sensor B14 and current sensor C19, the emitter of insulated gate gate transistors A7 is also connected with the collector electrode of insulated gate gate transistors B8, the emitter of insulated gate gate transistors B8 emitter and insulated gate gate transistors D10, the collector electrode of insulated gate gate transistors C9 is connected with the collector electrode of insulated gate gate transistors A7, the emitter of insulated gate gate transistors C9 is connected with the collector electrode of insulated gate gate transistors D10, the emitter of insulated gate gate transistors C9 is also connected with zero line, electric capacity C0 is also connected with between the collector electrode of insulated gate gate transistors C9 and the emitter of insulated gate gate transistors B8, the upper of electric capacity C0 is also parallel with voltage sensor B12, as shown in Figure 2, control system 6 concrete structure is: comprise dsp chip 11, dsp chip 11 is connected with LCDs 18 and relay 17 respectively, dsp chip 11 also with insulated gate gate transistors A7, insulated gate gate transistors B8, insulated gate gate transistors C9, the gate pole of insulated gate gate transistors D10 all connects.
The present invention is a kind of has the intelligent electric meter system improving quality of power supply function, when the fundamental wave reactive power needing load 3 to produce and 3,5,7 subharmonic current time, control system 6 detects load 3 current i
lharmonic component i
lhwith fundamental reactive current i
1q, using the command signal as offset current after its reversed polarity
the offset current i produced by single-phase electricity potential source type current transformer 5
cnamely with the harmonic component i in load current
lhwith fundamental reactive current i
1qon the contrary, thus both mutually offset, and make source current i for equal and opposite in direction, direction
sin only containing fundamental active current i
1p, so just reach the object suppressing harmonic wave and compensation fundamental reactive current in source current, in order to reduce the capacity of single-phase electricity potential source type current transformer 5, adopt switched capacitor 4 to compensate fundamental reactive current, through type (1) represents above-mentioned principle simultaneously:
In formula: i
1pthe fundamental active component of load current; i
1pthe fundamental reactive component of load current; i
lhthe harmonic component of load current; i
sfor power network current; i
lfor load current; i
cfor intelligent electric meter body output current.
Control with reference to figure 3 instruction book phase voltage source current transformer: by voltage sensor A13 sampling line voltage u
anwith single-phase electricity potential source type current transformer 5 DC voltage u
dc, by current sensor A15 sampling load current i
lwith current sensor C19 sampling single-phase electricity potential source type current transformer 5 ac-side current i
c; Obtained and line voltage u by phase-locked loop (Phase Locked Loop, PLL)
ansynchronous signal sin ω t; Direct voltage set-point
with direct voltage value of feedback u
dcthe input value that difference controls as PI, the output valve that PI controls and line voltage u
ansynchronous signal sin ω t is multiplied and obtains fundamental active current instruction
load current i
lby idle and harmonic current detection TTA obtain fundamental reactive current and 3,5,7 subharmonic current components; Fundamental reactive current and 3,5, after 7 subharmonic current component negates be
with fundamental active current instruction
addition obtains current-order
current-order
the pwm signal obtaining control switch devices switch is compared with triangular carrier.
Illustrate that the Current Detection Algorithm based on time domain (TTA) that the present invention adopts obtains fundamental wave reactive power and harmonic current components with reference to figure 4, through type (2) (3) (4) (5) realize the Current Detection Algorithm based on time domain
Single-phase power network current can be expressed as:
In formula: I
nfor each primary current amplitude,
for the initial phase of individual harmonic current.
It is generally acknowledged in power network current and only contain 3 times and above harmonic wave, get n=1,3,5,7.., so,
Wherein,
Namely load current comprises three parts: keep synchronous fundamental active current i with system fundamental voltage
1p; Fundamental reactive current i
1q; Harmonic current i
h, sin ω t and cos ω t is the phase-locked sine and cosine amount obtained,
Be multiplied by cos ω t on formula (2) (3) both sides simultaneously simultaneously, then have
Adopt low pass filter filtering alternating current component, its cut-off frequency, lower than twice current first harmonics frequency, can obtain i
1qhalf, if by gain increase be twice, can i be obtained
1q, so just can obtain instantaneous fundamental reactive current component
Similar, be multiplied by sin ω t on (4) both sides simultaneously, then have
Adopt same cut-off frequency lower than the low pass filter of twice current first harmonics frequency except after alternating current component, can i be obtained
1p, so just can obtain instantaneous fundamental active current component.
In like manner can obtain other each harmonic content.
The present invention is a kind of has the intelligent electric meter system improving quality of power supply function, to combine mode compensating power by adopting switched capacitor and SVG, not only can improve the power factor of electricity supplying and using system and load, reduce place capacity, reduce power loss, the voltage of receiving end and electrical network can also be stablized, improve power supply quality, active filter is adopted to carry out harmonics restraint, device can send with frequency with 3,5, a 7 anti-phase subharmonic current, reduce the harmonic content in electrical network, alleviate the harm that harmonic wave brings electric power system and power equipment etc.
Claims (5)
1. there is the intelligent electric meter system improving quality of power supply function, it is characterized in that, comprise the intelligent electric meter body (2) be connected between net side single phase alternating current power supply (1) and load (3).
2. according to claim 1 a kind ofly have the intelligent electric meter system improving quality of power supply function, it is characterized in that, the structure of described intelligent electric meter body (2) is: comprise control system (6), control system (6) also with switched capacitor (4), single-phase electricity potential source type current transformer (5) connects, voltage sensor A (13) is also connected with between live wire between described single-phase electricity potential source type current transformer (5) and net side single phase alternating current power supply (1) and zero line, live wire between described switched capacitor (4) and load (3) is also connected with current sensor A (15).
3. according to claim 2 a kind ofly have the intelligent electric meter system improving quality of power supply function, it is characterized in that, described switched capacitor (4) concrete structure is: comprise the three groups of switching circuits (16) between live wire and zero line being connected to net side single phase alternating current power supply (1), often organize switching circuit (16) to be composed in series by relay (17) and electric capacity (C1), described relay (17) is connected on live wire, and described electric capacity (C1) is connected on zero line.
4. according to claim 2 a kind ofly have the intelligent electric meter system improving quality of power supply function, it is characterized in that, the concrete structure of described single-phase electricity potential source type current transformer (5) is: comprise the insulated gate gate transistors A (7) be connected on live wire, the emitter of described insulated gate gate transistors A (7) is connected with live wire, inductance (L) is also connected with in turn between the emitter of insulated gate gate transistors A (7) and live wire, current sensor B (14) and current sensor C (19), the emitter of insulated gate gate transistors A (7) is also connected with the collector electrode of insulated gate gate transistors B (8), the emitter of insulated gate gate transistors B (8) emitter and insulated gate gate transistors D (10), the collector electrode of insulated gate gate transistors C (9) is connected with the collector electrode of insulated gate gate transistors A (7), the emitter of insulated gate gate transistors C (9) is connected with the collector electrode of insulated gate gate transistors D (10), the emitter of insulated gate gate transistors C (9) is also connected with zero line, electric capacity (C0) is also connected with between the collector electrode of described insulated gate gate transistors C (9) and the emitter of insulated gate gate transistors B (8), the upper of described electric capacity (C0) is also parallel with voltage sensor B (12).
5. according to claim 2 a kind ofly have the intelligent electric meter system improving quality of power supply function, it is characterized in that, described control system (6) concrete structure is: comprise dsp chip (11), described dsp chip (11) is connected with LCDs (18) and described relay (17) respectively, and dsp chip (11) is also all connected with the gate pole of described insulated gate gate transistors A (7), insulated gate gate transistors B (8), insulated gate gate transistors C (9), insulated gate gate transistors D (10).
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| CN201510338032.7A CN104953597B (en) | 2015-06-17 | 2015-06-17 | It is a kind of that there is the intelligent electric meter system for improving power quality function |
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Cited By (2)
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| CN105337482A (en) * | 2015-12-02 | 2016-02-17 | 浙江昱能科技有限公司 | Suppression method for output current harmonic waves of single-phase grid-connected inverter |
| CN106647246A (en) * | 2016-12-21 | 2017-05-10 | 张静 | Power supply control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105337482A (en) * | 2015-12-02 | 2016-02-17 | 浙江昱能科技有限公司 | Suppression method for output current harmonic waves of single-phase grid-connected inverter |
| CN106647246A (en) * | 2016-12-21 | 2017-05-10 | 张静 | Power supply control system |
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| CN104953597B (en) | 2018-09-14 |
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Effective date of registration: 20221108 Address after: 071000 the power park of Fang Shun Qiao Town, Mancheng District, Baoding, Hebei Patentee after: Baoding trillion Micro Software Technology Co.,Ltd. Address before: 710048 No. 5 Jinhua South Road, Shaanxi, Xi'an Patentee before: XI'AN University OF TECHNOLOGY |
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