CN102946102A - Variable-current power transmission system of tidal current generator unit, and working method thereof - Google Patents
Variable-current power transmission system of tidal current generator unit, and working method thereof Download PDFInfo
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- CN102946102A CN102946102A CN2012105101940A CN201210510194A CN102946102A CN 102946102 A CN102946102 A CN 102946102A CN 2012105101940 A CN2012105101940 A CN 2012105101940A CN 201210510194 A CN201210510194 A CN 201210510194A CN 102946102 A CN102946102 A CN 102946102A
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Abstract
The invention discloses a variable-current power transmission system of a tidal current generator unit, and a working method thereof; the variable-current power transmission system comprises a plurality of water-turbine generator sets which are respectively and sequentially connected with a corresponding electric reactor and a three-phase full-controlled rectifier; an output end of each three-phase full-controlled rectifier is respectively connected with a storage battery and a three-phase full-controlled inverter; a back-to-back structure is formed by each three-phase full-controlled rectifier and each three-phase full-controlled inverter; and an output end of each three-phase full-controlled inverter is connected with an electrical load by an inductance filter and an alternating-current transformer. The three-phase controlled rectifier adopts a three-phase full-controlled space vector pulse width modulation (SVPWM) rectifier, and the invention has the advantages of reducing the number of devices on a carrier platform, simplifying the system and reducing the consumption.
Description
Technical field
The present invention relates to the marine power generation technical field, relate in particular to a kind of tidal power generating unit unsteady flow transmission system and method for work.
Background technology
The offshore generating system of prior art, usually adopt every generator electric energy to be become the alternating current of voltage levels through the ac-dc-ac transform technology such as offshore wind farm, then carrying out electric power carries, electric equipment quantity is many, in addition the load of marine carrier platform large, cause the platform scale large, increased whole system complexity and system building cost.Existing tidal power generating system adopts generator output directly by the submarine cable mode of movement more, and output voltage is low, and transmission line loss is large.And existing tidal power generating system is generally one-of-a-kind system, corresponding to double-generator group or multiple generator group pattern trend power station, can only carry with many submarine cables, and cable cost obviously increases.For the tidal power generating unit that does not have self-startup ability, the existing rectifier system of not controlling does not have the hydraulic turbine of startup function.
Summary of the invention
The problem that purpose of the present invention is exactly that number of devices on the above-mentioned converter system carrier that prior art exists is many in order to solve, system complex, transmission line loss are serious, be not suitable with the conveying of multiple generator group electric power; A kind of tidal power generating unit unsteady flow transmission system and method for work are provided; Have advantages of number of devices on the carrier platform of minimizing, simplification system, reduce loss.
To achieve these goals, the present invention adopts following technical scheme:
A kind of tidal power generating unit unsteady flow transmission system, it comprises some hydraulic generator units, every hydraulic generator unit is connected successively with corresponding reactor, three-phase fully-controlled rectifier; The three-phase fully-controlled rectifier output end is connected with the three-phase fully-controlled inverter with storage battery respectively, and three-phase fully-controlled rectifier and three-phase fully-controlled inverter form back to back structure; The three-phase fully-controlled inverter output end then is connected with power load through inductance filter, AC transformer.
Described three-phase fully-controlled type current transformer adopts the current transformer of SVPWM Semiconductor Converting Technology can realize the two-way transmission of energy, can be operated in rectification state and can be operated in inverter mode again, and the power factor of power load side is to regulate.
Described storage battery is provided with two groups, the isolating switch of storage battery by separately and corresponding three-phase fully-controlled rectifier output end connection; Realize the corresponding three-phase fully-controlled rectifier of the concrete access of storage battery by closure isolating switch separately.
Described three-phase fully-controlled rectifier is connected with on the bank cable connection box by the seabed direct current cables, and described transfer box is connected with the three-phase fully-controlled inverter by common cable; Described cable connection box is used for seabed direct current cables and the transition of common cable on the bank, and the transfer box degree of protection is IP65.
Described hydraulic generator unit is two or many hydraulic generator units.
Adopt the method for work of above-mentioned a kind of tidal power generating unit unsteady flow transmission system, be divided into following several job steps:
Step 1, system starts:
Judge by the trend tachymeter whether tidal current speed reaches requirement,
When tidal current speed reached requirement condition, generator was in the preparation starting state;
When tidal current speed was lower than requirement condition, generator was in stopped status;
Step 2, the electric energy conversion: hydraulic generator is transformed into electric energy with marine tidal-current energy by the hydraulic turbine and generator, by reactor and the rectification of three-phase fully-controlled type separately, the three-phase fully-controlled type rectifier of described back to back structure and reactor together with voltage, frequency all unsettled AC energy be transformed into the direct current energy of voltage stabilization;
Step 3, electric energy output: the direct current of each output is connected in parallel, by the direct current submarine cable direct current energy is transported on the bank, the three-phase fully-controlled type inverter of described back to back structure converts direct current energy to the AC energy of frequency stabilization again, through filter and isolating transformer; Inductance filter filtering high order harmonic component; Eliminated the alternating current of high order harmonic component by isolating transformer, for final power load is powered.
Described step 3 because output directly links to each other with the user, so the state variation of load is larger, two kinds of situations may occur:
Situation one: the electric energy that sends surpasses the electric energy that consumes;
Situation two: the electric energy that sends consumes the situation of use not;
For situation one, three-phase fully-controlled type rectifier reduces the absorbed power of the hydraulic turbine, to adapt to the situation of underloading by adjusting hydraulic generator unit operation curve;
For situation two, three-phase fully-controlled type inverter can reduce output voltage, and whole system is with the ability work of maximum.
Beneficial effect of the present invention:
1. this invention can according to the operation characteristic of some hydraulic generator units of flow dynamic characteristic independent regulation, make the generating efficiency of two water wheels tidal power generating systems higher.
2. should share a DC-to-AC converter by two hydraulic generators of invention, reduce system equipment quantity, reduce investment.
3. effectively solve the converter system input current abnormality, reduced the loss of permanent magnet generator, prolonged the life-span of generator.
4. effectively solved the starting problem of non self starting tidal power generating unit.
5. inverter, inductance filter, transformer are installed on the bank, reduce the load of offshore platform, dwindle the platform scale, reduce cost has improved the economic benefit of electricity generation system.
6. adopt higher direct current transportation, effectively reduce the loss on the transmission line, can satisfy the power delivery requirement of middle power flow electricity generation system.
7. for the tidal power generating unit of many shared carrier platforms, adopt a submarine cable transmission of electricity, reduced number of cables, the direct current transportation cable only has two cores, than the core number minimizing of ac cable, has saved copper material and insulating material etc.
Description of drawings
Fig. 1 is circuit catenation principle figure of the present invention.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing and embodiment.
Tidal power generating unit unsteady flow transmission system, in conjunction with Fig. 1, comprise #1 hydraulic generator unit, #2 hydraulic generator unit, respectively with #1 hydraulic generator unit, the reactor that #2 hydraulic generator unit is connected and the #1 three-phase fully-controlled SVPWM rectifier that is connected with reactor respectively, #2 three-phase fully-controlled SVPWM rectifier, three-phase fully-controlled SVPWM inverter, inductance filter, AC transformer, described three-phase fully-controlled SVPWM rectifier output end is connected with three-phase fully-controlled SVPWM inverter by the seabed direct current cables, and three-phase fully-controlled SVPWM rectifier output end is connected with storage battery; Described #1 hydraulic generator unit, #2 hydraulic generator unit, reactor, #1 three-phase fully-controlled SVPWM rectifier, #2 three-phase fully-controlled SVPWM rectifier, storage battery are located on the marine carrier platform, and described three-phase fully-controlled SVPWM inverter, inductance filter, AC transformer and power load are located on the bank; Three-phase fully-controlled SVPWM inverter is connected with power load by inductance filter, the AC transformer that is connected.Described three-phase fully-controlled SVPWM rectifier, three-phase fully-controlled SVPWM inverter adopt the SVPWM Semiconductor Converting Technology can realize the two-way transmission of energy, can be operated in rectification state and can be operated in inverter mode again, and the power factor of electricity consumption side is adjustable.
Every hydraulic generator reactor of configuration of the present invention and a three-phase fully-controlled SVPWM rectifier, the rectification of boosting, output DC are incorporated dc bus into, then transmit electricity by direct current cables.Consider special running environment on the offshore platform, two group storage battery group cabinets are installed, and save arrangement space, and degree of protection meet the demands.Electric energy seabed direct current cables by suitable cross section after over commutation becomes direct current that two hydraulic generator units send is transported on the bank.The cross section of submarine cable is considered according to two unit maximum output, and consideration laying down on sea bottom environment is revised current-carrying capacity of cable.Cable connection box is set on the coast, is used for submarine cable and the transition of common cable on the bank.The transfer box degree of protection is IP65, satisfies the environmental requirement of the moist salt fog in seashore.Power delivery is ashore inputted three-phase inverter, and dc inverter is become alternating current, and inverter and inductance filter are used in conjunction with, and the high order harmonic component that produces in the elimination system reduces the pollution with electrical network.Select the power of inverter according to the power of two generating sets.Power for power load on the bank by isolating transformer through the later alternating current of filtering.
Be connected by three full-control type SVPWM current transformers between two direct-driving type tidal current generators of the present invention and the power load.Every hydraulic generator unit is connected successively with corresponding reactor, three-phase fully-controlled rectifier; The three-phase fully-controlled rectifier output end is connected with the three-phase fully-controlled inverter with storage battery respectively, and three-phase fully-controlled rectifier and three-phase fully-controlled inverter form back to back structure; The three-phase fully-controlled inverter output end then is connected with power load through inductance filter, AC transformer.
The unsettled electric energy of the electric voltage frequency that generator sends is powered to power load through the stable electric energy of process filter filtering output voltage frequency after this Structural Transformation.Every generator unit stator output links to each other with the generator side converter, and the decoupling zero control by current transformer realizes generator reactive power and electromagnetic torque independent regulation.With respect to the uncontrollable rectifier system of traditional diode, this decoupling zero control effectively solves the input current abnormality problem, has greatly reduced the loss of permanent magnet generator, has prolonged the useful life of generator.This topological structure also possesses the characteristic of boosting of Boost circuit simultaneously, can finish rectification and two parts work of boosting.To connect generating set and power load by the full-control type current transformer equally in the electricity consumption side, also reduced the harmonic pollution of marine tidal-current energy generator group to electrical network, control by decoupling zero simultaneously, conveniently adjust the reactive power that the marine tidal-current energy generator group is carried to power load, be used for being conducive to when generating electricity by way of merging two or more grid systems realize the reactive power compensation of marine tidal-current energy generator group when line voltage falls.This back-to-back topological structure can effectively be finished unsteady flow and the control of two marine tidal-current energy generator group AC-DC-AC, not only can realize simultaneously two magneto alternator maximal efficiencies, loss minimization controller, and this control mode can realize the rapid adjustment of power factor, is conducive to the marine tidal-current energy generator group and realizes low voltage crossing.
Although above-mentioned by reference to the accompanying drawings to the invention embodiment be described; but be not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (7)
1. a tidal power generating unit unsteady flow transmission system is characterized in that, it comprises some hydraulic generator units, and every hydraulic generator unit is connected successively with corresponding reactor, three-phase fully-controlled rectifier; The three-phase fully-controlled rectifier output end is connected with the three-phase fully-controlled inverter with storage battery respectively, and three-phase fully-controlled rectifier and three-phase fully-controlled inverter form back to back structure; The three-phase fully-controlled inverter output end then is connected with power load through inductance filter, AC transformer.
2. a kind of tidal power generating unit unsteady flow transmission system as claimed in claim 1, it is characterized in that, described three-phase fully-controlled type current transformer adopts the current transformer of SVPWM Semiconductor Converting Technology can realize the two-way transmission of energy, can be operated in rectification state and can be operated in inverter mode again, the power factor of power load side is to regulate.
3. a kind of tidal power generating unit unsteady flow transmission system as claimed in claim 1 is characterized in that, described storage battery is provided with two groups, the isolating switch of storage battery by separately and corresponding three-phase fully-controlled rectifier output end connection; Realize the corresponding three-phase fully-controlled rectifier of the concrete access of storage battery by closure isolating switch separately.
4. a kind of tidal power generating unit unsteady flow transmission system as claimed in claim 1 is characterized in that, described three-phase fully-controlled rectifier is connected with on the bank cable connection box by the seabed direct current cables, and described transfer box is connected with the three-phase fully-controlled inverter by common cable; Described cable connection box is used for seabed direct current cables and the transition of common cable on the bank, and the transfer box degree of protection is IP65.
5. a kind of tidal power generating unit unsteady flow transmission system as claimed in claim 1 is characterized in that, described hydraulic generator unit is two or many hydraulic generator units.
6. adopt the method for work of a kind of tidal power generating unit unsteady flow transmission system as claimed in claim 1, it is characterized in that, be divided into following several job steps:
Step 1, system starts:
Judge whether tidal current speed reaches requirement,
When tidal current speed reached requirement condition, generator was in the preparation starting state;
When tidal current speed was lower than requirement condition, generator was in stopped status;
Step 2, the electric energy conversion: hydraulic generator is transformed into electric energy with marine tidal-current energy by the hydraulic turbine and generator, by reactor and the rectification of three-phase fully-controlled type separately, the three-phase fully-controlled type rectifier of described back to back structure and reactor together with voltage, frequency all unsettled AC energy be transformed into the direct current energy of voltage stabilization;
Step 3, electric energy output: the direct current of each output is connected in parallel, by the direct current submarine cable direct current energy is transported on the bank, the three-phase fully-controlled type inverter of described back to back structure converts direct current energy to the AC energy of frequency stabilization again, through filter and isolating transformer; Inductance filter filtering high order harmonic component; Eliminated the alternating current of high order harmonic component by isolating transformer, for final power load is powered.
7. the method for work of a kind of tidal power generating unit unsteady flow transmission system as claimed in claim 6 is characterized in that, described step 3 because output directly links to each other with the user, so the state variation of load is larger, two kinds of situations may occur:
Situation one: the electric energy that sends surpasses the electric energy that consumes;
Situation two: the electric energy that sends consumes the situation of use not;
For situation one, three-phase fully-controlled type rectifier reduces the absorbed power of the hydraulic turbine, to adapt to the situation of underloading by adjusting hydraulic generator unit operation curve;
For situation two, three-phase fully-controlled type inverter can reduce output voltage, and whole system is with the ability work of maximum.
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| CN201210510194.0A CN102946102B (en) | 2012-12-03 | 2012-12-03 | Working method of variable-current power transmission system of tidal current generator unit |
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| CN201210510194.0A CN102946102B (en) | 2012-12-03 | 2012-12-03 | Working method of variable-current power transmission system of tidal current generator unit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105840396A (en) * | 2016-05-25 | 2016-08-10 | 赣州黄金沃特发电设备有限公司 | Inverter type water turbine generator set |
| CN106356891A (en) * | 2016-10-14 | 2017-01-25 | 江门市安利电源工程有限公司 | Asynchronous power generating device and working method thereof |
| WO2023197624A1 (en) * | 2022-04-13 | 2023-10-19 | 青岛海尔空调器有限总公司 | Tidal power generation control method and device |
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| JP2003501993A (en) * | 1999-05-28 | 2003-01-14 | エービービー エービー | Wind power plant |
| CN102182635A (en) * | 2011-05-06 | 2011-09-14 | 河海大学 | Offshore renewable energy source comprehensive power generating system |
| CN202957598U (en) * | 2012-12-03 | 2013-05-29 | 山东电力工程咨询院有限公司 | Current converting and power transmitting device of power flow generating set |
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2012
- 2012-12-03 CN CN201210510194.0A patent/CN102946102B/en active Active
Patent Citations (3)
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| JP2003501993A (en) * | 1999-05-28 | 2003-01-14 | エービービー エービー | Wind power plant |
| CN102182635A (en) * | 2011-05-06 | 2011-09-14 | 河海大学 | Offshore renewable energy source comprehensive power generating system |
| CN202957598U (en) * | 2012-12-03 | 2013-05-29 | 山东电力工程咨询院有限公司 | Current converting and power transmitting device of power flow generating set |
Non-Patent Citations (1)
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| 张少杰等: "1kW 潮流能发电装置逆变器SVPWM 技术的研究与应用", 《中国可再生能源学会海洋能专业委员会第三届学术讨论会论文集》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105840396A (en) * | 2016-05-25 | 2016-08-10 | 赣州黄金沃特发电设备有限公司 | Inverter type water turbine generator set |
| CN106356891A (en) * | 2016-10-14 | 2017-01-25 | 江门市安利电源工程有限公司 | Asynchronous power generating device and working method thereof |
| WO2023197624A1 (en) * | 2022-04-13 | 2023-10-19 | 青岛海尔空调器有限总公司 | Tidal power generation control method and device |
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| CN102946102B (en) | 2014-10-29 |
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Effective date of registration: 20211231 Address after: 250014 Shandong Province, Lixia District of Ji'nan city Min Zi Qian Road No. 106 Patentee after: Shandong Electric Power Engineering Consulting Institute Corp.,Ltd. Address before: 250014 Shandong Province, Lixia District of Ji'nan city Min Zi Qian Road No. 106 Patentee before: Shandong Electric Power Engineering Consulting Institute Corp.,Ltd. Patentee before: Harbin ruiha Technology Development Co., Ltd |
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