CN107317311A - Dc circuit breaker operating criterion in a kind of symmetrical monopolar flexible direct current power transmission system - Google Patents
Dc circuit breaker operating criterion in a kind of symmetrical monopolar flexible direct current power transmission system Download PDFInfo
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- CN107317311A CN107317311A CN201710419666.4A CN201710419666A CN107317311A CN 107317311 A CN107317311 A CN 107317311A CN 201710419666 A CN201710419666 A CN 201710419666A CN 107317311 A CN107317311 A CN 107317311A
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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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- 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
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/262—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 involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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Abstract
本发明公开了一种对称单极柔性直流输电系统中直流断路器动作判据。目前通常使用的直流断路器动作判据是判断流过直流断路器的电流，当电流的绝对值大于设定的保护定值时直流断路器跳闸，即过流保护，但该种方案容易造成保护误动，影响了系统运行。本发明采用电压电流判据同时满足来判断直流断路器是否需要跳闸，即采用以下判据：I>Iset，UL+UN<Uset，两个条件同时满足，其中I为流过直流断路器的电流，该电流有方向，且规定直流断路器的保护方向为正，Iset为过流保护定值；UL为正极直流电压，UN为负极直流电压，Uset为电压定值。本发明采用带方向的电流判据联合电压判据作为直流断路器的跳闸依据，防止了直流断路器误动作。
The invention discloses an action criterion of a direct current circuit breaker in a symmetrical unipolar flexible direct current transmission system. At present, the commonly used DC circuit breaker action criterion is to judge the current flowing through the DC circuit breaker. When the absolute value of the current is greater than the set protection value, the DC circuit breaker trips, that is, over-current protection, but this kind of scheme is easy to cause protection. Misoperation, affecting the system operation. The present invention judges whether the DC circuit breaker needs to be tripped by simultaneously satisfying the voltage and current criteria, that is, adopts the following criteria: I>I set , U L +U N <U set , and the two conditions are satisfied at the same time, wherein I is the DC circuit breaker flowing through The current of the circuit breaker, the current has a direction, and it is stipulated that the protection direction of the DC circuit breaker is positive, I set is the overcurrent protection setting; U L is the positive DC voltage, U N is the negative DC voltage, and U set is the voltage setting . The invention adopts the directional current criterion combined with the voltage criterion as the tripping basis of the DC circuit breaker, thereby preventing the DC circuit breaker from malfunctioning.
Description
技术领域technical field
本发明涉及直流断路器领域，具体地说是一种对称单极柔性直流输电系统中直流断路器动作判据。The invention relates to the field of direct current circuit breakers, in particular to an action criterion of a direct current circuit breaker in a symmetrical unipolar flexible direct current transmission system.
背景技术Background technique
目前世界上只有一个直流断路器正式投入商业运行，有关直流断路器的动作判据尚未有公开文献开展详细论述，通常使用的方案一般是判断流过直流断路器的电流，当电流|I|>Iset时直流断路器跳闸，即过流保护，其中Iset为设定的保护定值，但该种方案容易造成保护误动，比如对于单极接地短路故障，实际上只要设备绝缘设计没问题，换流站依旧可以持续运行，无需直流断路器跳闸，但由于故障瞬间会产生冲击电流导致直流断路器误动作，影响了系统运行。At present, only one DC circuit breaker has been officially put into commercial operation in the world. There is no public literature on the action criterion of the DC circuit breaker in detail. The commonly used scheme is to judge the current flowing through the DC circuit breaker. When the current |I|> When I set , the DC circuit breaker trips, that is, overcurrent protection, where I set is the set protection value, but this kind of scheme is easy to cause protection misoperation, such as for single-pole grounding short-circuit faults, in fact, as long as the equipment insulation design is no problem , the converter station can continue to operate without tripping the DC circuit breaker, but the DC circuit breaker malfunctions due to the inrush current generated at the moment of the fault, which affects the system operation.
另外，由于该动作判据电流只考虑大小，未考虑方向，会导致保护的反向区域内故障断路器也会误动作。In addition, because the action criterion only considers the magnitude of the current and does not consider the direction, it will cause the fault circuit breaker in the reverse area of protection to also malfunction.
发明内容Contents of the invention
本发明所要解决的技术问题是克服上述现有技术存在的缺陷，提供一种对称单极柔性直流输电系统中直流断路器动作判据，其采用带方向的电流判据联合电压判据作为直流断路器的跳闸依据，以防止直流断路器误动作。The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art, and provide a DC circuit breaker action criterion in a symmetrical unipolar flexible DC transmission system, which uses a directional current criterion combined with a voltage criterion as a DC circuit breaker The basis for the tripping of the DC circuit breaker to prevent the malfunction of the DC circuit breaker.
为此，本发明采用如下的技术方案：一种对称单极柔性直流输电系统中直流断路器动作判据，其采用电压电流判据同时满足来判断直流断路器是否需要跳闸，即采用以下判据：For this reason, the present invention adopts the following technical solution: a DC circuit breaker action criterion in a symmetrical unipolar flexible DC power transmission system, which uses the voltage and current criteria to meet simultaneously to determine whether the DC circuit breaker needs to trip, that is, the following criterion is used :
I>Iset，I>I set ,
UL+UN<Uset，U L + U N < U set ,
两个条件同时满足，其中I为流过直流断路器的电流，该电流有方向，且规定直流断路器的保护方向为正，Iset为过流保护定值；UL为正极直流电压，UN为负极直流电压，Uset为电压定值。Two conditions are met at the same time, where I is the current flowing through the DC circuit breaker, the current has a direction, and the protection direction of the DC circuit breaker is specified as positive, I set is the overcurrent protection setting; U L is the positive DC voltage, U N is the negative DC voltage, and U set is the voltage setting.
进一步地，所述直流断路器的安装位置为柔性直流换流阀直流出口并经过平波电抗器后的位置。Further, the installation position of the DC circuit breaker is the position after the DC outlet of the flexible DC converter valve passes through the smoothing reactor.
进一步地，对称单极柔性直流输电系统中电流的采样频率≥50kHz，同时为防止噪声干扰，电流采样后进行滤波，滤波用采样数据与前4个采样数据取平均进行。Furthermore, the sampling frequency of the current in the symmetrical unipolar flexible direct current transmission system is ≥ 50kHz. At the same time, in order to prevent noise interference, the current is filtered after sampling, and the sampling data and the first 4 sampling data are averaged for filtering.
进一步地，对称单极柔性直流输电系统中电压UL和UN的采样频率≥50kHz，同时为防止噪声干扰，电压采样后进行滤波，滤波用采样数据与前4个数据取平均进行。Further, the sampling frequency of the voltages U L and U N in the symmetrical unipolar flexible DC transmission system is ≥ 50kHz. At the same time, in order to prevent noise interference, the voltage is sampled and then filtered, and the sampling data and the first 4 data are averaged for filtering.
进一步地，Iset取在该直流断路器保护的线路末端故障下5ms内出现的最大短路电流的0.7～1.0倍，可根据实际情况整定。Further, I set is 0.7-1.0 times of the maximum short-circuit current occurring within 5 ms under the fault at the end of the line protected by the DC circuit breaker, and can be set according to the actual situation.
进一步地，所述的Uset取正常运行时(UL+UN)的0～0.3倍，可根据实际情况整定。Further, the U set is 0-0.3 times of normal operation (UL + U N ) , which can be set according to the actual situation.
本发明具有的有益效果如下：本发明采用带方向的电流判据联合电压判据作为直流断路器的跳闸依据，有效防止了直流断路器误动作。The beneficial effects of the present invention are as follows: the present invention uses the directional current criterion combined with the voltage criterion as the trip basis of the DC circuit breaker, effectively preventing the DC circuit breaker from malfunctioning.
附图说明Description of drawings
图1为对称单极柔性直流输电系统换流站拓扑图。Fig. 1 is the topological diagram of the converter station of the symmetrical unipolar flexible direct current transmission system.
具体实施方式detailed description
下面结合具体实施方式对本发明作进一步的说明。The present invention will be further described below in combination with specific embodiments.
一种对称单极柔性直流输电系统中直流断路器动作判据，其采用电压电流判据同时满足来判断直流断路器是否需要跳闸，即采用以下判据：An action criterion for a DC circuit breaker in a symmetrical unipolar flexible DC transmission system, which uses the simultaneous satisfaction of the voltage and current criteria to determine whether the DC circuit breaker needs to trip, that is, the following criteria are used:
I>Iset，I>I set ,
UL+UN<Uset，U L + U N < U set ,
两个条件同时满足，其中I为流过直流断路器的电流，该电流有方向，且规定直流断路器的保护方向为正，Iset为过流保护定值；UL为正极直流电压，UN为负极直流电压，Uset为电压定值。Two conditions are met at the same time, where I is the current flowing through the DC circuit breaker, the current has a direction, and the protection direction of the DC circuit breaker is specified as positive, I set is the overcurrent protection setting; U L is the positive DC voltage, U N is the negative DC voltage, and U set is the voltage setting.
所述直流断路器的安装位置为柔性直流换流阀直流出口并经过平波电抗器后的位置，如图1所示。The installation position of the DC circuit breaker is the position after the DC outlet of the flexible DC converter valve passes through the smoothing reactor, as shown in FIG. 1 .
对称单极柔性直流输电系统中电流的采样频率≥50kHz，同时为防止噪声干扰，电流采样后进行滤波，滤波用采样数据与前4个采样数据取平均进行。对称单极柔性直流输电系统中电压UL和UN的采样频率≥50kHz，同时为防止噪声干扰，电压采样后进行滤波，滤波用采样数据与前4个数据取平均进行。The sampling frequency of the current in the symmetrical unipolar flexible DC transmission system is ≥50kHz. At the same time, in order to prevent noise interference, the current is sampled and filtered, and the sampling data and the first 4 sampling data are averaged for filtering. The sampling frequency of the voltage U L and U N in the symmetrical unipolar flexible DC transmission system is ≥ 50kHz. At the same time, in order to prevent noise interference, the voltage is sampled and filtered, and the sampling data and the first 4 data are averaged for filtering.
Iset取在该直流断路器保护的线路末端故障下5ms内出现的最大短路电流的0.7～1.0倍，可根据实际情况整定。 Iset is taken as 0.7~1.0 times of the maximum short-circuit current that occurs within 5ms under the fault at the end of the line protected by the DC circuit breaker, and can be set according to the actual situation.
Uset取正常运行时(UL+UN)的0～0.3倍，可根据实际情况整定。U set is 0~0.3 times of (U L +U N ) during normal operation, and can be set according to the actual situation.
以上所述，仅是本发明的较佳实施例而已，并非对本发明的结构作任何形式上的限制。凡是依据本发明的技术实质对以上实施例所作的任何简单修改、等同变化与修饰，均落入本发明的保护范围内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the structure of the present invention in any form. All simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention fall within the protection scope of the present invention.
Claims (6)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110518554A (en) * | 2019-07-30 | 2019-11-29 | 南京南瑞继保电气有限公司 | The relaying configuration and detection method in a kind of direct current system direct current region |
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| CN105552947A (en) * | 2016-01-13 | 2016-05-04 | 特变电工新疆新能源股份有限公司 | Direct-current single-pole ground fault detection method for flexible direct-current power transmission system |
| CN106159913A (en) * | 2016-06-30 | 2016-11-23 | 天津大学 | Multi-terminal flexible direct current system direct current fault protecting method |
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Patent Citations (4)
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| JP5094062B2 (en) * | 2006-07-12 | 2012-12-12 | 中国電力株式会社 | Short-circuit current reduction system and short-circuit current reduction method for power transmission and distribution system |
| CN104820157A (en) * | 2015-04-30 | 2015-08-05 | 国家电网公司 | Direct-current single-pole ground fault determination method of flexible direct-current power transmission system |
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Cited By (2)
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| CN110518554A (en) * | 2019-07-30 | 2019-11-29 | 南京南瑞继保电气有限公司 | The relaying configuration and detection method in a kind of direct current system direct current region |
| CN110518554B (en) * | 2019-07-30 | 2021-05-28 | 南京南瑞继保电气有限公司 | Protection configuration and detection method for direct current area of direct current system |
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