CN111697608B - Method and system for determining voltage operation range of converter bus - Google Patents
Method and system for determining voltage operation range of converter bus Download PDFInfo
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- CN111697608B CN111697608B CN202010342541.8A CN202010342541A CN111697608B CN 111697608 B CN111697608 B CN 111697608B CN 202010342541 A CN202010342541 A CN 202010342541A CN 111697608 B CN111697608 B CN 111697608B
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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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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
- 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]
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Abstract
The invention discloses a method and a system for determining a voltage operation range of a converter bus, and belongs to the technical field of safe and stable operation of a large alternating current-direct current hybrid power grid. The method comprises the following steps: selecting an initial running mode to be checked of the direct current system, and determining the upper limit/the lower limit of the steady-state voltage of a bus of the converter station; according to the initial operation mode, selecting a maximum under-compensation operation mode to determine the stable voltage rise of the bus of the direct current converter station after the direct current bipolar locking fault; according to the initial operation mode, selecting a direct current restarting strategy to determine the stable state voltage drop of the direct current converter station bus after the direct current bipolar locking fault; and determining the voltage operating range of the commutation bus during the normal operation of the direct current. The method is simple and easy to implement, can obviously improve the calculation efficiency by adopting the method in the direct current debugging calculation, saves manpower and material resources, and creates obvious economic benefits.
Description
Technical Field
The invention relates to the technical field of safe and stable operation of a large alternating current-direct current hybrid power grid, in particular to a method and a system for determining the voltage operation range of a converter bus.
Background
The basic national situation that the distribution of energy resources and economic development of China are extremely unbalanced determines that the energy resources must be optimally configured nationwide. In order to optimize energy resource allocation in China and meet the economic growth demand in eastern areas, extra-high voltage alternating current or direct current is required to be used for power transmission. The extra-high voltage direct current system has the characteristics of high capacity, controllability and flexibility, fourteen commissioning extra-high voltage direct current projects are provided at home at present, namely +/-800 kV Chusui, re-vone, jin Su, pu Qiao, tian Zhong, bin jin, lin Shao, wine lake, sn Tai, zhao Yihua, yan Huai, zu Qing, lan Shang and +/-1100 kV Jiquan direct current projects. During normal operation of the extra-high voltage direct current, in order to ensure that the voltage of the converter bus does not exceed the upper limit and the lower limit of the steady-state voltage to cause equipment damage after various alternating current faults and direct current faults occur, the voltage control range of the converter bus must be specified clearly. At present, on the method for calculating the voltage control range of the converter bus in the normal operation period of direct current, no normative calculation process exists, the voltage control range is obtained by summarizing and traversing various possible conditions, the calculation amount is large, and the efficiency is low.
Disclosure of Invention
In view of the above problems, the present invention provides a method for determining an operating range of a commutating bus voltage, comprising:
selecting an initial running mode to be checked of the direct current system, and determining the upper limit/lower limit U of the steady-state voltage of the bus of the converter station max /U min ；
According to the initial operation mode, selecting the maximum under-compensation operation mode to determine the steady state voltage rise delta U of the bus of the direct current converter station after the direct current bipolar lockout fault 1 ；
According to the initial operation mode, a direct current restart strategy is selected to determine the steady state voltage drop delta U of the bus of the direct current converter station after the direct current bipolar locking fault 2 ；
According to U max /U min 、ΔU 1 And delta U 2 And determining the operating range of the voltage of the commutation bus.
Optionally, the initial operation mode includes: determining a direct current power level, a reactive compensation mode, a near-region line power flow, a unit running state, a filter cutting strategy and a safety control cutting machine strategy.
Optionally, the method further includes:
when the direct current system is in a severe working condition, selecting a direct current power level according to an initial operation mode, and selecting a maximum under-compensation mode and a direct current on-start strategy according to the initial operation mode and the direct current power level;
the severe conditions are steady state or intermediate operating conditions that meet certain system specific requirements, including: 70% step-down operation and metal/ground return switching.
Optionally, the bus voltage control range during the normal operation of the direct current is as follows: u shape min +ΔU 2 ～U max -ΔU 1 。
Optionally, selecting a maximum under-compensation mode specifically includes:
according to the initial operation mode, determining a reactive power exchange reference value Q of the converter station and the alternating current system ref Dead band Q determined by filter capacity 0 According to Q ref And Q 0 Determining the maximum reactive power provided by the AC system as Q ref +Q 0 Maximum reactive power Q provided by said AC system ref +Q 0 The method is the maximum under-compensation mode.
The present invention also provides a system for determining a converter bus voltage operating range, comprising:
an initial selection module for selecting an initial operation mode to be checked of the direct current system and determining the upper limit/lower limit U of the steady-state voltage of the bus of the converter station max /U min ；
The first selection module selects a maximum under-compensation operation mode to determine the steady-state voltage rise delta U of the bus of the direct-current converter station after the direct-current bipolar blocking fault according to the initial operation mode 1 ；
The second selection module selects a direct current restarting strategy to determine the steady state voltage drop delta U of the direct current converter station bus after the direct current bipolar locking fault according to the initial operation mode 2 ；
A range determination module according to U max /U min 、ΔU 1 And delta U 2 And determining the operating range of the voltage of the commutation bus.
Optionally, the initial operation mode includes: determining a direct current power level, a reactive compensation mode, a near-region line power flow, a unit running state, a filter cutting strategy and a safety control generator tripping strategy.
Optionally, the system further includes:
the third selection module selects a direct current power level according to the initial operation mode when the direct current system is in a severe working condition, and selects a maximum under-compensation mode and a direct current on-start strategy according to the initial operation mode and the direct current power level;
the severe conditions are steady state or intermediate operating conditions that meet certain system specific requirements, including: 70% step-down operation and metal/ground return switching.
Optionally, the bus voltage control range during the normal operation of the direct current is as follows: u shape min +ΔU 2 ～U max -ΔU 1 。
Optionally, selecting a maximum under-compensation mode specifically includes:
according to the initial operation mode, determining a reactive power exchange reference value Q of the converter station and the alternating current system ref Dead band Q determined by filter capacity 0 According to Q ref And Q 0 Determining the maximum reactive power provided by the AC system as Q ref +Q 0 Maximum reactive power Q provided by said AC system ref +Q 0 The method is the maximum under-compensation mode.
The method is simple and easy to implement, can obviously improve the calculation efficiency by adopting the method in the direct current debugging calculation, saves manpower and material resources, and creates obvious economic benefits.
Drawings
FIG. 1 is a flow chart of a method for determining a converter bus voltage operating range in accordance with the present invention;
figure 2 is a block diagram of a system for determining the operating range of the commutating bus voltage of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings are not intended to limit the present invention. In the drawings, the same unit/element is denoted by the same reference numeral.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention provides a method for determining a voltage operation range of a commutation bus, which comprises the following steps as shown in figure 1:
selecting an initial running mode to be checked of the direct current system, and determining the upper limit/lower limit U of the steady-state voltage of the bus of the converter station max /U min ；
An initial mode of operation comprising: determining a direct current power level, a reactive compensation mode, a near-region line power flow, a unit running state, a filter cutting strategy and a safety control cutting machine strategy.
According to the initial operation mode, the maximum under-compensation operation mode is selected to determine the steady-state voltage rise delta U of the bus of the direct current converter station after the direct current bipolar blocking fault 1 ；
Determining reactive power consumed during direct current operation of the converter station, wherein the reactive power comprises: reactive power Q provided by AC filter LC And reactive power Q provided by AC system ex ；
Determining a reactive power exchange reference value Q of a converter station and an AC system ref Dead band Q determined by filter capacity 0 ；
When the reactive power Q provided by the AC system ex When the voltage exceeds the preset range, the filter is automatically switched;
the preset ranges are as follows:
Q ref -Q 0 ＜Q ex ＜Q ref +Q 0
the maximum reactive power provided by the AC system is Q ref +Q 0 Maximum reactive power Q provided by said AC system ref +Q 0 The method is the maximum under-compensation mode.
According to the initial operation mode, a direct current restarting strategy is selected to determine the steady state voltage drop delta U of the direct current converter station bus after the direct current bipolar blocking fault 2 ；
According to U max /U min 、ΔU 1 And delta U 2 And determining the voltage operating range of the commutation bus during the normal operation of the direct current.
The control range of the bus voltage during the normal operation of the direct current is as follows: u shape min +ΔU 2 ～U max -ΔU 1 。
When the direct current system is in a severe working condition, selecting a direct current power level according to an initial operation mode, and selecting a maximum under-compensation mode and a direct current on-start strategy according to the initial operation mode and the direct current power level;
the severe conditions are steady state or intermediate operating conditions that meet certain system specific requirements, including: 70% step-down operation and metal/ground return switching.
In accordance with an initial mode of operation, the present invention also provides a system 200 for determining a converter bus voltage operating range, comprising:
an initial selection module 201, which selects an initial operation mode of the dc system to be checked, and determines the upper limit/lower limit U of the steady-state voltage of the bus of the converter station max /U min ；
An initial mode of operation comprising: determining a direct current power level, a reactive compensation mode, a near-region line power flow, a unit running state, a filter cutting strategy and a safety control generator tripping strategy.
The first selection module 202 selects a maximum under-compensation operation mode to determine the steady-state voltage rise delta U of the bus of the direct current converter station after the direct current bipolar locking fault according to the initial operation mode 1 ；
Selecting a maximum under-compensation mode, which specifically comprises the following steps:
according to the initial operation mode, determining a reactive power exchange reference value Q of the converter station and the alternating current system ref Dead band Q determined by filter capacity 0 According to Q ref And Q 0 Determining the maximum reactive power provided by the AC system as Q ref +Q 0 Said communication system providingMaximum reactive power Q supplied ref +Q 0 The method is the maximum under-compensation mode.
The second selection module 203 selects a direct current restart strategy to determine the steady-state voltage drop delta U of the bus of the direct current converter station after the direct current bipolar locking fault according to the initial operation mode 2 ；
A range determination module 204 based on U max /U min 、ΔU 1 And delta U 2 Determining the converter bus voltage operating range, U, during normal DC operation min +ΔU 2 ～U max -ΔU 1 。
A third selecting module 205, configured to select a direct current power level according to the initial operation mode when the direct current system is in a severe condition, and select a maximum under-compensation mode and a direct current on-start strategy according to the initial operation mode and the direct current power level;
severe conditions are steady state or intermediate operating conditions that meet certain system specific requirements, including: and (4) performing 70% voltage reduction operation and switching the working condition by a metal/ground return line.
The method is simple and easy to implement, can obviously improve the calculation efficiency by adopting the method in the direct current debugging calculation, saves manpower and material resources, and creates obvious economic benefits.
Claims (6)
1. A method for determining a commutating bus voltage operating range, the method comprising:
selecting an initial running mode to be checked of the direct current system, and determining the upper limit/lower limit U of the steady-state voltage of the bus of the converter station max /U min ；
According to the initial operation mode, selecting the maximum under-compensation operation mode to determine the steady-state voltage rise delta U of the bus of the direct current converter station after the direct current bipolar lockout fault 1 ；
The selection of the maximum under-compensation operation mode specifically comprises the following steps:
according to the initial operation mode, determining a reactive power exchange reference value Q of the converter station and the alternating current system ref Dead band Q determined by filter capacity 0 According to Q ref And Q 0 Determining the maximum reactive power provided by the AC system as Q ref +Q 0 SaidMaximum reactive power Q provided by AC system ref +Q 0 The method is a maximum under-compensation mode;
according to the initial operation mode, selecting a direct current restarting strategy to determine the steady state voltage drop delta U of the bus of the direct current converter station after the direct current bipolar locking fault 2 ；
According to U max /U min 、△U 1 And delta U 2 Determining a voltage operating range of a commutation bus during the normal operation of direct current, wherein the voltage control range of the bus during the normal operation of direct current is as follows: u shape min +△U 2 ～U max -△U 1 。
2. The method of claim 1, said initial mode of operation comprising: determining a direct current power level, a reactive compensation mode, a near-region line power flow, a unit running state, a filter cutting strategy and a safety control cutting machine strategy.
3. The method of claim 1, further comprising:
when the direct current system is in a severe working condition, selecting a direct current power level according to an initial operation mode, and selecting a maximum under-compensation mode and a direct current restarting strategy according to the initial operation mode and the direct current power level;
the severe conditions are steady state or intermediate operating conditions that meet certain system specific requirements, including: and (4) performing 70% voltage reduction operation and switching the working condition by a metal/ground return line.
4. A system for determining a commutating bus voltage operating range, the system comprising:
the initial selection module selects an initial operation mode to be checked of the direct current system and determines the upper limit/lower limit U of the steady-state voltage of the bus of the converter station max /U min ；
The first selection module selects the maximum under-compensation operation mode to determine the steady-state voltage rise delta U of the bus of the direct current converter station after the direct current bipolar locking fault according to the initial operation mode 1 ；
The selection of the maximum under-complementing operation mode specifically comprises the following steps:
according to the initial operation mode, determining a reactive power exchange reference value Q of the converter station and the alternating current system ref Dead band Q determined by filter capacity 0 According to Q ref And Q 0 Determining the maximum reactive power provided by the AC system as Q ref +Q 0 Maximum reactive power Q provided by said AC system ref +Q 0 The method is a maximum under-compensation mode;
the second selection module selects a direct current restarting strategy to determine the steady state voltage drop delta U of the direct current converter station bus after the direct current bipolar locking fault according to the initial operation mode 2 ；
A range determination module according to U max /U min 、△U 1 And delta U 2 Determining a voltage operating range of a commutation bus during the normal operation of direct current, wherein the voltage control range of the bus during the normal operation of direct current is as follows: u shape min +△U 2 ～U max -△U 1 。
5. The system of claim 4, wherein the initial mode of operation comprises: determining a direct current power level, a reactive compensation mode, a near-region line power flow, a unit running state, a filter cutting strategy and a safety control cutting machine strategy.
6. The system of claim 4, further comprising:
the third selection module selects a direct current power level according to the initial operation mode when the direct current system is in a severe working condition, and selects a maximum under-compensation mode and a direct current restarting strategy according to the initial operation mode and the direct current power level;
the severe conditions are steady state or intermediate operating conditions that meet certain system specific requirements, including: 70% step-down operation and metal/ground return switching.
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| CN202010342541.8A CN111697608B (en) | 2020-04-26 | 2020-04-26 | Method and system for determining voltage operation range of converter bus |
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| CN103606945B (en) * | 2013-11-19 | 2016-04-20 | 国家电网公司 | A kind of control system of Multi-end flexible direct current transmission system and control method thereof |
| CN103972897B (en) * | 2014-05-29 | 2016-04-20 | 国家电网公司 | A kind of extra-high-voltage alternating current transformer station 500kV bus working voltage control range defining method |
| CN109038572B (en) * | 2018-08-30 | 2021-05-07 | 国家电网公司华东分部 | Voltage safety range determination method considering faults of alternating current-direct current hybrid power grid |
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