WO2018196830A1 - 一种用于柔性直流输电***孤岛启动的方法 - Google Patents
一种用于柔性直流输电***孤岛启动的方法 Download PDFInfo
- Publication number
- WO2018196830A1 WO2018196830A1 PCT/CN2018/084716 CN2018084716W WO2018196830A1 WO 2018196830 A1 WO2018196830 A1 WO 2018196830A1 CN 2018084716 W CN2018084716 W CN 2018084716W WO 2018196830 A1 WO2018196830 A1 WO 2018196830A1
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- Prior art keywords
- voltage
- stage
- flexible
- reference wave
- island
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Definitions
- the invention relates to the technical field of flexible direct current transmission of a power system, and in particular to a method for island start of a flexible direct current transmission system.
- Flexible DC transmission uses a voltage source converter to independently and quickly control the active and reactive power of the control system, thereby improving system stability, suppressing system frequency and voltage fluctuations, and improving the steady-state performance of the grid-connected AC system. .
- the object of the present invention is to provide a method for island start-up of a flexible direct current transmission system in view of the deficiencies of the prior art, which can avoid large disturbances and large shocks when the island is started, and can effectively suppress the initial stage output voltage and current when the zero voltage is started.
- the high frequency components and distortion ensure stable operation of the system.
- a method for island start-up of a flexible direct current transmission system the island control mode is first started in an open loop control mode with zero voltage, followed by double closed loop control, or directly adopts double closed loop control, and the outer loop control output voltage of the double closed loop control Amplitude and frequency, the inner loop controls the output current to establish a steady-state voltage;
- the characteristic is that the amplitude of the voltage reference wave generated by the flexible DC control system adopts a segmented mode, which is divided into at least two segments, and the first segment of the reference amplitude
- the value starts from zero or a certain value U x and rapidly rises to U a kV according to the rate ⁇ kV/s, and the subsequent other reference wave amplitude increases at the same or different rate, and are not greater than the first segment rate ⁇ , the last segment
- the reference wave amplitude is finally raised to the rated voltage U N kV , so that the island of the flexible DC transmission system is undisturbed and has no impact start; wherein the initial value of the reference
- ⁇ is the voltage rise rate of the second stage
- ⁇ is the voltage rise rate of the third stage
- ⁇ is the voltage rise rate of the Nth stage.
- the invention provides a method for island start of a flexible direct current transmission system, characterized in that the segmented output of the voltage reference wave has a segment number N ⁇ 2.
- the invention provides a method for island start of a flexible direct current transmission system, which is characterized in that, when the zero pressure is started, the load can be started with or without a load.
- Figure 1 is a schematic diagram of a flexible DC transmission system at both ends
- Figure 2 is an island closed-loop control startup flow chart
- FIG. 3 uses the startup waveform of the islanding method described herein;
- Figure 4 shows the startup waveform of the reference wave voltage amplitude rising from 0 at 5.975kV/s when the island is started.
- the schematic diagram of the flexible direct current transmission system is shown in Fig. 1.
- the islanding start is performed by the steps shown in Fig. 2.
- the voltage reference wave starts from 0kv, and assumes that the rated voltage is 119.5kV; when the reference voltage of the output voltage is small, the sampling voltage and current error and harmonic content are too large. Adverse effects of the control system;
- Fig. 3 is a waveform when the islanding method described herein is employed
- Fig. 4 is a waveform when the voltage output RMS value rises directly at 5.975 kV/s when the invention is not employed.
- UREF_L1, URF_L2, and URF_L3 represent A, B, and C three-phase reference waves.
- UY_LA_C, UY_LB_C, and UY_LA_C represent the actual voltage generated according to the reference wave. It can be seen that when the island startup method described in this paper is used The waveform is smooth and has no impact.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Dc-Dc Converters (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
Description
Claims (5)
- 一种用于柔性直流输电***孤岛启动的方法,在孤岛控制模式中先以开环控制方式零电压启动,然后后采用双闭环控制,或者直接采用双闭环控制;所述双闭环控制中,外环控制输出电压幅值和频率,内环控制输出电流,建立稳态电压;其特征在于:柔性直流控制***产生的电压参考波幅值大小采用分段的模式,至少分为两段,第一段电压参考波幅值从零或定值U xkV开始,按照速率αkV/s升至U akV,最后一段参考波幅值升至额定电压UNkV;其中,参考波的初始值U x≤0.4p.u,第一段速率α≥2.0p.u/s;第一阶段电压升至U akV后,作为第二阶段的电压参考波初始值;第二阶段电压升至UbkV后,作为第三阶段参考波初始值,且U x≤U a≤U b≤……≤U N,U NkV=1.0p.u。
- 如权利要求1所述的一种柔性直流输电***孤岛启动的方法,其特征在于,第一阶段的电压上升速率大于或者等于第二阶段、第三阶段、……、第N阶段的电压上升速率,即α≥β≥0、α≥γ≥0、α≥ε≥0kV/s,β为第二阶段的电压上升速率,γ为第三阶段的电压上升速率,ε为第N阶段的电压上升速率。
- 如权利要求1所述的一种柔性直流输电***孤岛启动的方法,其特征在于,电压参考波的分段输出,其分段数N≥2。
- 如权利要求1所述的一种柔性直流输电***孤岛启动的方法,其特征在于,孤岛启动时,带负载启动,或者不带负载启动。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US16/607,847 US11329486B2 (en) | 2017-04-27 | 2018-04-27 | Method for initiating flexible DC transmission system under isolated island condition |
KR1020197031676A KR102278988B1 (ko) | 2017-04-27 | 2018-04-27 | 유연 직류 송전 시스템의 아일랜딩 가동 개시를 위한 방법 |
AU2018259838A AU2018259838B2 (en) | 2017-04-27 | 2018-04-27 | Method for initiating flexible DC transmission system under isolated island condition |
EP18790888.4A EP3618215A4 (en) | 2017-04-27 | 2018-04-27 | METHOD FOR INITIATING A FLEXIBLE DC CIRCUIT TRANSMISSION SYSTEM UNDER ISOLATED ISLAND CONDITIONS |
JP2019558665A JP6880234B2 (ja) | 2017-04-27 | 2018-04-27 | 離島におけるフレキシブル直流送電システムの起動方法 |
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CN201710286180.8A CN106953349B (zh) | 2017-04-27 | 2017-04-27 | 一种用于柔性直流输电***孤岛启动的方法 |
CN201710286180.8 | 2017-04-27 |
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WO2018196830A1 true WO2018196830A1 (zh) | 2018-11-01 |
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PCT/CN2018/084716 WO2018196830A1 (zh) | 2017-04-27 | 2018-04-27 | 一种用于柔性直流输电***孤岛启动的方法 |
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US (1) | US11329486B2 (zh) |
EP (1) | EP3618215A4 (zh) |
JP (1) | JP6880234B2 (zh) |
KR (1) | KR102278988B1 (zh) |
CN (1) | CN106953349B (zh) |
AU (1) | AU2018259838B2 (zh) |
WO (1) | WO2018196830A1 (zh) |
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CN110147637A (zh) * | 2019-06-05 | 2019-08-20 | 厦门大学 | 基于小波及谐波成分贪婪稀疏识别的碰摩故障诊断方法 |
CN110912091A (zh) * | 2019-12-03 | 2020-03-24 | 西安交通大学 | 一种柔性直流输电线路单端行波超高速保护***及方法 |
CN114123286A (zh) * | 2021-11-26 | 2022-03-01 | 中国三峡建工(集团)有限公司 | 一种柔性直流***灵活电压的控制方法 |
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CN106953349B (zh) * | 2017-04-27 | 2019-06-21 | 南京南瑞继保电气有限公司 | 一种用于柔性直流输电***孤岛启动的方法 |
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- 2018-04-27 EP EP18790888.4A patent/EP3618215A4/en active Pending
- 2018-04-27 KR KR1020197031676A patent/KR102278988B1/ko active IP Right Grant
- 2018-04-27 US US16/607,847 patent/US11329486B2/en active Active
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CN110147637A (zh) * | 2019-06-05 | 2019-08-20 | 厦门大学 | 基于小波及谐波成分贪婪稀疏识别的碰摩故障诊断方法 |
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CN110912091A (zh) * | 2019-12-03 | 2020-03-24 | 西安交通大学 | 一种柔性直流输电线路单端行波超高速保护***及方法 |
CN110912091B (zh) * | 2019-12-03 | 2020-11-10 | 西安交通大学 | 一种柔性直流输电线路单端行波超高速保护***及方法 |
CN114123286A (zh) * | 2021-11-26 | 2022-03-01 | 中国三峡建工(集团)有限公司 | 一种柔性直流***灵活电压的控制方法 |
CN114123286B (zh) * | 2021-11-26 | 2023-06-27 | 中国三峡建工(集团)有限公司 | 一种柔性直流***灵活电压的控制方法 |
Also Published As
Publication number | Publication date |
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CN106953349A (zh) | 2017-07-14 |
US20200195013A1 (en) | 2020-06-18 |
AU2018259838A1 (en) | 2019-11-14 |
EP3618215A1 (en) | 2020-03-04 |
JP6880234B2 (ja) | 2021-06-02 |
KR102278988B1 (ko) | 2021-07-16 |
JP2020518228A (ja) | 2020-06-18 |
KR20190134681A (ko) | 2019-12-04 |
US11329486B2 (en) | 2022-05-10 |
AU2018259838B2 (en) | 2020-12-10 |
EP3618215A4 (en) | 2020-05-06 |
CN106953349B (zh) | 2019-06-21 |
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