CN103532161A - Topological structure of hybrid direct-current power transmission system based on auxiliary power supply and starting method - Google Patents
Topological structure of hybrid direct-current power transmission system based on auxiliary power supply and starting method Download PDFInfo
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Abstract
The invention relates to a topological structure of a hybrid direct-current power transmission system starting way and a staring method, in particular to a topological structure of a hybrid direct-current power transmission system based on an auxiliary power supply and a starting method. The topological structure is specific to a dual-end large power grid hybrid direct-current system; a VSC (Voltage Source Converter) is adopted on a rectifying side; an LCC converter is adopted on an inversion side; a starting power supply constructed by an uncontrolled rectifying device is connected in parallel to the middle of a direct-current circuit. The starting process of the system is completed by establishing direct-current voltage firstly by using a starting power supply. The topological structure has the advantages that 1, the problem of the lack of starting direct-current voltage can be solved effectively when the topological structure is applied to the starting process of a practical dual-end large power grid hybrid direct-current transmission system; 2, due to the adoption of the starting method, impacts of system voltage and current can be reduced effectively in a starting process, and the safety of power equipment is protected.
Description
Technical field
The present invention relates to a kind of topological structure and starting method of Hybrid HVDC system Starting mode, especially relate to a kind of Hybrid HVDC system topology and starting method based on accessory power supply.
Background technology
In recent years, along with the development of high voltage dc transmission technology, the consideration based on technology and economic factor, the Hybrid HVDC system that LCC converter and VSC converter form has good application prospect.At present, Hybrid HVDC system is in wind-electricity integration, light current net and passive network power supply, the fields such as load center transmission of electricity have outstanding superiority of effectiveness to big city etc., believe that Hybrid HVDC system will have very wide application prospect along with the development of national wind-powered electricity generation and the continuous increase of urban power consumption.Due to the particularity of Hybrid HVDC system-comprise one-way flow and the inconsistent problem of two ends current conversion station entry condition of trend, when connecting AC system, it is constant DC voltage control that most mixed DC system is all preferentially selected VSC side, like this Hybrid HVDC entire system control strategy and application have all been formed to great restriction, and when LCC realizes DC voltage control (or determining gamma kick) as Inverter Station, its difficulty is that the entry condition of VSC and LCC is conflicting, in order to solve this bottleneck, must solve the starting problem of Hybrid HVDC system under this application scenarios.
Summary of the invention
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals:
A kind of Hybrid HVDC system topology based on accessory power supply, it is characterized in that, rectification side is that electric network source connects first change of current of VSC converter by first converter transformer, the first converter transformer primary side arranges first AC circuit breaker, the AC of VSC converter in parallel one group corresponding to the characteristic harmonics filter under VSC converter switching frequency, the converter reactor of connecting on alternating current circuit simultaneously; Described characteristic harmonics filter is mainly harmonic wave the stable DC electric current that the characteristic harmonics filter of 6 times, 12 times is produced with filtering LCC converter switch.
Inversion side is through the second converter transformer and the 3rd converter transformer, to be linked into electrical network respectively after six pulsation LCC converters and intermediate point ground connection of two parallel connections, and the second converter transformer secondary side is connected with the second AC circuit breaker with the 3rd converter transformer primary side simultaneously;
Described VSC converter is connected with LCC converter through DC line, is also connected with start-up circuit in described DC line.
VSC converter adopts d-q decoupling zero Direct Current Control, and its real power control amount is active power, and idle controlled quentity controlled variable is reactive power, adopts to be easy in this way control brachium pontis and to cut-off, and realizes the flexible control of power.LCC converter adopts determines voltage control.
At the above-mentioned Hybrid HVDC system topology based on accessory power supply, described DC line comprises two electric capacity of voltage regulation that are connected in parallel on the outlet of rectification side VSC converter; Two LCC Converter DC-side ports of export are connected respectively after a flat ripple reactance and are connected with the rectification side at VSC converter, and a stack features subharmonic filter in parallel is also distinguished at DC line the two poles of the earth.
At the above-mentioned Hybrid HVDC system topology based on accessory power supply, described start-up circuit comprises a startup power supply, described startup power supply connects the 3rd converter transformer to three-phase bridge control rectifying circuit not through the 3rd AC circuit breaker, then be parallel to DC line the two poles of the earth, at the outlet of a control rectifying circuit not electric capacity in parallel, with DC circuit interface end, DC circuit breaker is set.
A starting method for the Hybrid HVDC system of accessory power supply, is characterized in that, comprises the following steps:
Step 1, by whole system, in stopped status, VSC converter and LCC converter connect AC system in blocking by the first converter transformer and the second converter transformer respectively.
Step 3, disconnects accessory power supply, disconnects the 3rd AC circuit breaker and the DC circuit breaker of not controlling commutating circuit; Closed rectification side the first AC circuit breaker of while also starts VSC converter, and setting meritorious power command value is that 0.1pu, reactive power command value are 0pu; When direct voltage reaches 1.0pu, then closed inversion side the second AC circuit breaker starts LCC converter, and system completes start-up course and enters steady operation state.It should be noted in the discussion above that pu refers to perunit value here, according to user, set voluntarily fiducial value.
Therefore; tool of the present invention has the following advantages: 1. while being applied in the large electrical network Hybrid HVDC system starting process of actual two ends; for VSC converter, start and need direct voltage, LCC converter to start required power feed-in; but before starting, the two all can not give required separately condition this contradiction mutually; the impact that can provide a good solution 2. this kind of starting method can effectively reduce system voltage electric current in start-up course, thus protection power equipment, extend its useful life.
Accompanying drawing explanation
Fig. 1 is overall topological schematic diagram of the present invention.
Fig. 2 is the control block diagram of the rectifier that relates in the present invention.
Fig. 3 is the control block diagram of the inverter that relates in the present invention.
Fig. 4 is the start-up course flow chart relating in the present invention.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment:
If Fig. 1 is that whole Hybrid HVDC starts system topological figure, wherein 1 is two ends AC system, 2.1 is the first AC circuit breaker, 2.2 is the second AC circuit breaker, 2.3 is the second AC circuit breaker, 3.1 is the first converter transformer, 3.2 is the second converter transformer, 3.3 is the 3rd converter transformer, 3.4 is the 4th converter transformer, 4 is alternating current filter, 4.5 is converter reactor, 5 is VSC converter, 6 is LCC converter, 7 is electric capacity of voltage regulation, 8 is DC circuit breaker, 9 is DC filter, 10 is flat ripple reactance, 11 for starting power supply, 12 is control rectifying circuit not.
Fig. 2,3 is respectively the basic controlling block diagram of rectification side VSC converter and inversion side LCC converter.Wherein VSC converter adopts the Direct Current Control mode of d-q decoupling zero in order to determine transmitting active power, and LCC converter adopts the control of PI ring to determine direct voltage.
Fig. 4 has provided the basic procedure of two ends large electrical network Hybrid HVDC system starting process, first its embodiment for starting DC circuit breaker and the AC circuit breaker of not controlling rectifier power source and closing respectively in start-up circuit, now starting power supply starts to set up gradually direct voltage for DC capacitor charging, closed rectification side AC circuit breaker start VSC converter when direct voltage reaches 0.95pu, enabled instruction value active power is 0.1pu, and reactive power is 0pu.The AC circuit breaker and the DC circuit breaker that when starting VSC converter, cut off startup power circuit exit to reach the object that starts power circuit.Now, rely on the active power of determining of VSC to control and can continue as DC capacitor charging, direct voltage continues to rise.When direct voltage reaches 1pu, closed inversion side AC circuit breaker and startup LCC converter, power starts to be transferred to inversion top-cross streaming system by rectification top-cross streaming system gradually, now increase gradually VSC converter active power command value to 1.0pu, through-put power also will raise gradually and reach rated power, and whole start-up course completes substantially.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various modifications or supplement or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Claims (4)
1. the Hybrid HVDC system topology based on accessory power supply, it is characterized in that, rectification side is that electric network source connects VSC converter by first converter transformer, the first converter transformer primary side arranges first AC circuit breaker, the AC of VSC converter in parallel one group corresponding to the characteristic harmonics filter under VSC converter switching frequency, the converter reactor of connecting on alternating current circuit simultaneously;
Inversion side is through the second converter transformer and the 3rd converter transformer, to be linked into electrical network respectively after six pulsation LCC converters and intermediate point ground connection of two parallel connections, and the second converter transformer secondary side is connected with the second AC circuit breaker with the 3rd converter transformer primary side simultaneously;
Described VSC converter is connected with LCC converter through DC line, is also connected with start-up circuit in described DC line.
2. the Hybrid HVDC system topology based on accessory power supply according to claim 1, is characterized in that, described DC line comprises two electric capacity of voltage regulation that are connected in parallel on the outlet of rectification side VSC converter; Two LCC Converter DC-side ports of export are connected respectively after a flat ripple reactance and are connected with the rectification side of VSC converter, and a stack features subharmonic filter in parallel is also distinguished at DC line the two poles of the earth.
3. the Hybrid HVDC system topology based on accessory power supply according to claim 1, it is characterized in that, described start-up circuit comprises a startup power supply, described startup power supply connects the 4th converter transformer to three-phase bridge control rectifying circuit not through the 3rd AC circuit breaker, then be parallel to DC line the two poles of the earth, at the outlet of a control rectifying circuit not electric capacity in parallel, with DC circuit interface end, DC circuit breaker is set.
4. a starting method for the Hybrid HVDC system based on accessory power supply, is characterized in that, comprises the following steps:
Step 1, by whole system, in stopped status, VSC converter and LCC converter connect AC system in blocking by the first converter transformer and the second converter transformer respectively;
Step 2, starts respectively closed DC circuit breaker and the 3rd AC circuit breaker of not controlling rectification DC side, and the charge circuit by accessory power supply makes to set up gradually in DC line the 0.95pu that direct voltage reaches rated direct voltage;
Step 3, disconnects accessory power supply, disconnects the 3rd AC circuit breaker and the DC circuit breaker of not controlling commutating circuit; Closed rectification side the first AC circuit breaker also starts VSC converter, and setting meritorious power command value is that 0.1pu, reactive power command value are 0pu; When direct voltage reaches 1.0pu, then closed inversion side the second AC circuit breaker starts LCC converter, and system completes start-up course and enters steady operation state.
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| CN104967141A (en) * | 2015-06-26 | 2015-10-07 | 许继电气股份有限公司 | Hybrid direct current transmission system |
| CN105429165A (en) * | 2015-12-23 | 2016-03-23 | 湖北工业大学 | Multi-port hybrid DC power transmission system topology for power supply to multi-droppoint passive network and control method of multi-port hybrid DC power transmission system topology |
| WO2016179810A1 (en) * | 2015-05-13 | 2016-11-17 | Abb Schweiz Ag | Hybrid high voltage direct current converter station and operation method therefor |
| CN106936154A (en) * | 2015-12-29 | 2017-07-07 | 中国电力科学研究院 | Start method for the grid-connected series-parallel connection direct current network of extensive remote offshore wind farm |
| CN108092295A (en) * | 2016-11-21 | 2018-05-29 | 南方电网科学研究院有限责任公司 | Single valve group puts into method online in a kind of mixed DC system |
| CN108370160A (en) * | 2015-12-17 | 2018-08-03 | 通用电器技术有限公司 | Power supply unit |
| EP3514936A4 (en) * | 2017-12-07 | 2019-10-02 | Shanghai Jiao Tong University | Hybrid dc converter for offshore wind farm |
| CN111541259A (en) * | 2020-04-23 | 2020-08-14 | 南方电网科学研究院有限责任公司 | Charging control method, device and medium for hybrid multi-terminal direct current transmission system |
| US11594952B2 (en) | 2020-10-23 | 2023-02-28 | Delta Electronics (Shanghai) Co., Ltd. | Auxiliary power supply device for inverter, inverter, and method for starting the same |
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| CN110350770B (en) * | 2019-06-20 | 2021-02-19 | 武汉大学 | Auxiliary voltage source-based series IGBT voltage-sharing method and system |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016179810A1 (en) * | 2015-05-13 | 2016-11-17 | Abb Schweiz Ag | Hybrid high voltage direct current converter station and operation method therefor |
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| CN105429165A (en) * | 2015-12-23 | 2016-03-23 | 湖北工业大学 | Multi-port hybrid DC power transmission system topology for power supply to multi-droppoint passive network and control method of multi-port hybrid DC power transmission system topology |
| CN106936154A (en) * | 2015-12-29 | 2017-07-07 | 中国电力科学研究院 | Start method for the grid-connected series-parallel connection direct current network of extensive remote offshore wind farm |
| CN106936154B (en) * | 2015-12-29 | 2021-10-01 | 中国电力科学研究院 | Series-parallel direct-current power grid starting method for large-scale long-distance offshore wind power grid connection |
| CN108092295A (en) * | 2016-11-21 | 2018-05-29 | 南方电网科学研究院有限责任公司 | Single valve group puts into method online in a kind of mixed DC system |
| EP3514936A4 (en) * | 2017-12-07 | 2019-10-02 | Shanghai Jiao Tong University | Hybrid dc converter for offshore wind farm |
| CN111541259A (en) * | 2020-04-23 | 2020-08-14 | 南方电网科学研究院有限责任公司 | Charging control method, device and medium for hybrid multi-terminal direct current transmission system |
| CN111541259B (en) * | 2020-04-23 | 2021-07-30 | 南方电网科学研究院有限责任公司 | Charging control method, device and medium for hybrid multi-terminal direct current transmission system |
| US11594952B2 (en) | 2020-10-23 | 2023-02-28 | Delta Electronics (Shanghai) Co., Ltd. | Auxiliary power supply device for inverter, inverter, and method for starting the same |
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