CN101645603A - Negative sequence management method of energy injection type balance electric system - Google Patents
Negative sequence management method of energy injection type balance electric system Download PDFInfo
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- CN101645603A CN101645603A CN200910306410A CN200910306410A CN101645603A CN 101645603 A CN101645603 A CN 101645603A CN 200910306410 A CN200910306410 A CN 200910306410A CN 200910306410 A CN200910306410 A CN 200910306410A CN 101645603 A CN101645603 A CN 101645603A
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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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
The invention discloses a negative sequence management method of an energy injection type balance electric system. The method comprises the following steps: detecting imbalance of three phases of a power grid side and asymmetry of all phases of a load side in real time; selecting converter with lighter loads for phase at the power grid side for rectification according to the imbalance of three phases of the power grid side; connecting direct current output by the converter at the power grid side to the converter connected with heavy load phase by a common direct-current bus; and carrying out inverse output on loads by the converter connected with heavy loads. The method solves the problem of negative sequence management of asymmetric loads of the electric system.
Description
Technical field
The present invention relates to a kind of electric power system negative sequence management method, particularly a kind of electric power system negative sequence management method of energy injection type balance.
Background technology
According to the principles of electric and electronic engineering, all available symmetrical component method of any one asymmetric load is decomposed into positive sequence, negative phase-sequence and three groups of symmetrical component of zero sequence, and most typical asymmetric load is the arc furnace of electric railway trailer system, metallurgy industry etc.
The main harm that factor such as three-phase voltage or current imbalance produces: (1) electric rotating machine moves under asymmetrical state, can make rotor produce supplementary load loss and heating, thereby cause motor integral body or local heating, the opposing magnetic field produces additional moment and can make motor appearance vibration in addition.For generator, in stator, also can form a series of high order harmonic components.(2) cause with the negative sequence component to be the kinds of protect generation misoperation of starting component, directly threaten operation of power networks.(3) unbalance voltage makes silicon rectifying equipment non-characteristic harmonic wave occur.(4) for generator, transformer, when three-phase load is uneven, as to control maximum phase current be rated value, then all the other two-phases just can not be fully loaded with, thereby utilization rate of equipment and installations decline, otherwise, will cause the bigger phase overload of load as keeping rated capacity, cause wave distortion but also the magnetic circuit imbalance can occur, equipment supplementary load loss increase etc.
Summary of the invention
In order to solve problems such as negative sequence voltage that the electric power system asymmetric load produces, electric current, the present invention proposes a kind of electric power system negative sequence management method of energy injection type balance.Take selectively from load lighter draw uneven energy mutually, through handing over the orthogonal transform part, selectively inject, thereby realize the in a basic balance of net side three-phase load to the heavier energy that carries out mutually of load.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: each degree of asymmetry mutually of degree of unbalance and load side of real-time detection of grid side three-phase, according to the degree of unbalance of grid side three-phase choose grid side load lighter carry out rectification with converter, the output direct current of net side converter is received the converter that the heavy load phase is connect through common DC bus, and the converter that heavy load connect carries out inversion output to load.
A kind of electric power system negative sequence management method of energy injection type balance, may further comprise the steps: the degree of asymmetry of real-time each phase of detection load side and the degree of unbalance of net side three-phase, according to degree of asymmetry choose load side load lighter use the converter rectification mutually, the rectification output of converter is received the mutually pairing net side of heavy load converter through common DC bus, and the inversion of net side converter outputs to the mutually pairing net side of heavy load.
A kind of electric power system negative sequence management method of energy injection type balance, may further comprise the steps: the degree of asymmetry of real-time each phase of detection load side, according to degree of asymmetry choose load lighter carry out rectification with converter, the output direct current of converter is received the converter of heavy load phase through dc bus, by the change of current inversion output of heavy load phase.
Technique effect of the present invention is: the present invention take selectively from load lighter draw uneven energy mutually, through handing over the orthogonal transform part, selectively inject to the heavier energy that carries out mutually of load, thereby realize the in a basic balance of net side three-phase load, from truly having solved the imbalance problem of electric power system.
The present invention is further described below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is the topology diagram of the embodiment of the invention 1.Among the figure, 1. be the net side transformer, 2 is net side set of converters, and 3 is the load side set of converters, and 4 is dc capacitor.
Fig. 2 is the topology diagram of the embodiment of the invention 2.Among the figure, 1 is the load side set of converters, and 2 is dc capacitor.
Fig. 3 is a flow chart of the present invention.
Embodiment
Referring to Fig. 1, Fig. 1 is the topology diagram of the embodiment of the invention 1.During energy balance device operate as normal shown in Figure 1 is to be connected in parallel in the major loop, the input of net side set of converters connects from net side step-down transformer or directly connects net side three-phase system, change of current output is by common DC bus connected load side set of converters, realization with the unnecessary asymmetric energy of net side to the injection of load side than heavy phase; Or realize the unnecessary asymmetric energy of load side is loaded than the injection of heavy phase to the net side, thereby realizing the in a basic balance of net side three-phase load, this structure can realize the transmitted in both directions of energy.The working method one of first kind of topology diagram is: each degree of asymmetry mutually of degree of unbalance and load side that detects net side three-phase in real time, according to control strategy choose net side load lighter carry out rectification mutually, the big I that this net side converter draws energy from the net side is controlled flexibly, its output direct current is received load side single-phase inverters group through common DC bus, finally carry out inversion output through the single-phase inverters that this phase connect to load according to control strategy selection heavy load is pairing, be injected into the heavy load phase of asymmetric load by drawing the uneven energy of net side, thereby realize that net side three-phase is in a basic balance.The working method two of first kind of topology diagram is: the degree of asymmetry of real-time each phase of detection load side and the degree of unbalance of net side three-phase, choose the lighter single-phase inverters rectification of load side load according to control strategy through joining with it, this rectification output is received net side converter through common DC bus, finally select the net pairing phase that stresses to load according to control strategy, this carries out inversion output to converter arm through joining with it mutually to the net side, be injected into the heavy load phase of uneven net side by drawing the uneven energy of load side, thereby realize that net side three-phase is in a basic balance.
Referring to Fig. 2, Fig. 2 is the topology diagram of the embodiment of the invention 2.During energy balance device operate as normal shown in Figure 2 and three-phase load be connected in parallel, take to detect in real time the degree of asymmetry of both sides traction load, according to control strategy take selectively from load lighter draw uneven energy mutually, through handing over the orthogonal transform part, selectively inject, thereby realize the in a basic balance of main transformer secondary side three-phase load to the heavier energy that carries out mutually of load.The working mechanism of second kind of topology is: the degree of asymmetry of real-time each phase of detection load side, according to control strategy choose load lighter carry out rectification mutually, converter draws the big I of energy and controls flexibly, its output direct current is received other phase single-phase inverters groups through dc bus, finally carry out inversion output through the single-phase inverters that this phase connect mutually to this according to control strategy selection heavy load is pairing, be injected into the heavy load phase by the energy that draws the light load phase, each is mutually in a basic balance thereby realize load side.
Referring to Fig. 3, Fig. 3 is a flow chart of the present invention.Its process is: detect the degree of unbalance of three-phase current in real time, according to the controller control strategy of design, determine direction of tide, i.e. decision is drawn can draw imbalance power mutually, what carries out energy mutually to simultaneously and injects; When determining direction of tide, obtain corresponding current-order according to control algolithm, and send out trigger impulse to the work converter of correspondence according to this current-order, drive converter work through drive circuit.
Claims (3)
1. the electric power system negative sequence management method of an energy injection type balance, may further comprise the steps: each degree of asymmetry mutually of degree of unbalance and load side of real-time detection of grid side three-phase, according to the degree of unbalance of grid side three-phase choose grid side load lighter carry out rectification with converter, the output direct current of net side converter is received the converter that the heavy load phase is connect through common DC bus, and the converter that heavy load connect carries out inversion output to load.
2. the electric power system negative sequence management method of an energy injection type balance, may further comprise the steps: the degree of asymmetry of real-time each phase of detection load side and the degree of unbalance of net side three-phase, according to degree of asymmetry choose load side load lighter use the converter rectification mutually, the rectification output of converter is received the mutually pairing net side of heavy load converter through common DC bus, and the inversion of net side converter outputs to the mutually pairing net side of heavy load.
3. the electric power system negative sequence management method of an energy injection type balance, may further comprise the steps: the degree of asymmetry of real-time each phase of detection load side, according to degree of asymmetry choose load lighter carry out rectification with converter, the output direct current of converter is received the converter of heavy load phase through dc bus, by the change of current inversion output of heavy load phase.
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| CN200910306410A CN101645603A (en) | 2009-08-31 | 2009-08-31 | Negative sequence management method of energy injection type balance electric system |
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| CN200910306410A CN101645603A (en) | 2009-08-31 | 2009-08-31 | Negative sequence management method of energy injection type balance electric system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832632A (en) * | 2012-09-14 | 2012-12-19 | 重庆大学 | Controllable interphase power transfer method and system |
| CN106159984A (en) * | 2016-08-12 | 2016-11-23 | 广州德昊电力科技有限公司 | A kind of alternate transfer system of three phase network energy |
| CN107221942A (en) * | 2016-11-18 | 2017-09-29 | 都书言 | A kind of multinomial energy transfer device and its control method |
-
2009
- 2009-08-31 CN CN200910306410A patent/CN101645603A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832632A (en) * | 2012-09-14 | 2012-12-19 | 重庆大学 | Controllable interphase power transfer method and system |
| CN102832632B (en) * | 2012-09-14 | 2014-10-08 | 重庆大学 | Controllable interphase power transfer method and system |
| CN106159984A (en) * | 2016-08-12 | 2016-11-23 | 广州德昊电力科技有限公司 | A kind of alternate transfer system of three phase network energy |
| CN107221942A (en) * | 2016-11-18 | 2017-09-29 | 都书言 | A kind of multinomial energy transfer device and its control method |
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Open date: 20100210 |