CN104052076B - Method for estimating parallel resonance frequency of direct current sending end island system - Google Patents
Method for estimating parallel resonance frequency of direct current sending end island system Download PDFInfo
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- CN104052076B CN104052076B CN201310730394.1A CN201310730394A CN104052076B CN 104052076 B CN104052076 B CN 104052076B CN 201310730394 A CN201310730394 A CN 201310730394A CN 104052076 B CN104052076 B CN 104052076B
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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
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Abstract
The invention discloses a method for estimating parallel resonant frequency of a direct current sending end island system. The method comprises the following steps: 1) establishing data for calculating short-circuit current of an alternating current power grid in an island system; 2) calculating the short-circuit capacity of the current conversion bus; 3) calculating reactive compensation capacity and line charging reactive capacity of the converter station; 4) and estimating a value of the parallel resonance frequency according to the fundamental frequency, the short-circuit capacity of the alternating current system, the reactive compensation capacity of the converter station and the charging reactive power of the line. The method of the invention considers the charging capacitance of the circuit during the estimation of the resonant frequency, and is closer to the actual situation, so that the estimated resonant frequency is more accurate.
Description
Technical field
The invention belongs to power system computation analysis field, relate to a kind of electrical network parallel resonance frequency evaluation method, more
Body relates to a kind of method considering line charging idle estimation direct current sending end islanded system parallel resonance frequency, belongs to estimation straight
The innovative technology of the method for streaming end islanded system parallel resonance frequency.
Background technology
High pressure and extra-high voltage direct-current transmission technology are due to its technology and economic traits, in remote, the large capacity transmission
To extensively application.The capacity of DC transmission engineering is generally large, and direct current locking fault occurs in networking operation, and dc power will turn
Move on to the communication channel of parallel running, cause the risk of system unstability, need safety stabilization control system to take to cut machine cutting load
Measure guarantees stable so that safety stabilization control system degree of dependence is increased by operation of power networks day by day.Additionally, DC online fortune
OK, for ensureing that direct current one pole locking post-fault system is stable, the communication channel trend of parallel running needs reserved bigger nargin, uses
In the power accepting direct current one pole locking transfer.
Direct current islet operation is possible not only to dissolve DC bipolar block and surely controls tripping or the multiple-circuit line event of one pole locking simultaneously
Barrier causes the risk of system unstability, and can discharge the nargin of parallel running communication channel, improves AC-HVDC passage total
Ability to transmit electricity.Therefore, increasing DC transmission engineering all using sending end islet operation as one of its normal operating mode,
To reduce system safety hazards.
But, under DC transmission system sending end decoupled mode, AC system is the most weak, capacity of short circuit and short-circuit ratio
Low, current conversion station is configured with substantial amounts of reactive-load compensation equipment simultaneously, there is inductive element and capacitive element under certain condition and send out
The risk of raw parallel resonance.Directive/guide " the IEEEguide forplanningDClinksterminatingatAClocati of IEEE
Onshavinglow short-circuitcapacities " propose resonant frequency evaluation method as follows:
Wherein, f1For fundamental frequency, SACFor the capacity of short circuit of AC system, Q at change of current busFilterNothing for current conversion station
Merit compensation capacity.
Its theoretical foundation is when frequency reachesTime, the impedance phase of impedance and the capacitive of perception in system
Deng, reach parallel resonance condition.
But it practice, the circuit in islanded system is constantly present certain ground connection susceptance, sends capacitive reactive power, therefore examine
Should take into account idle for the charging of circuit during the capacitive reactances of worry system;When AC system capacity of short circuit calculates simultaneously, meter
The charging that the capacity of short circuit of the capacity of short circuit obtained perception system often deducts circuit is idle, the therefore perception of real system
Capacity should be calculated capacity of short circuit and the idle sum of line charging.
In sum, when estimating direct current sending end islanded system resonant frequency, it should consider the effect that line charging is idle.
Summary of the invention
The purpose of the present invention is to propose to a kind of method estimating direct current sending end islanded system parallel resonance frequency.The present invention is
A kind of method considering line charging idle estimation direct current sending end islanded system parallel resonance frequency, at direct current sending end islanded system
During resonant frequency estimation, it is considered to the impact that line charging is idle, thus it is actual to be more nearly system, improves the accurate of computational analysis
Property.
To achieve these goals, the present invention adopts the following technical scheme that
The present invention estimates the method for direct current sending end islanded system parallel resonance frequency, at estimation direct current sending end islanded system also
During connection resonant frequency, it is contemplated that the impact that line charging is idle.
The present invention estimates the method for direct current sending end islanded system parallel resonance frequency, comprises the following steps:
1) set up AC network calculation of short-circuit current data in islanded system, wherein count line charging idle, but
Do not include current conversion station reactive-load compensation;
2) capacity of short circuit S of change of current bus is calculatedAC;
3) current conversion station reactive compensation capacity Q is calculated according to current conversion station reactive-load compensation equipment parameterFilter, each according to current conversion station
Return back out idle total capacity Q of charging of the route parameter calculation circuit of lineLine;
4) according to fundamental frequency, AC system capacity of short circuit, current conversion station reactive compensation capacity, line charging reactive power,
Estimation parallel resonance frequency numerical value as follows:
Wherein fresFor resonant frequency, f1For fundamental frequency, K is proportionality coefficient.
Above-mentioned steps 1) in AC network calculation of short-circuit current data include electromotor, transformator, track data.
Above-mentioned steps 4) in Proportional coefficient K take 0~1.
The present invention is a kind of method considering line charging idle estimation direct current sending end islanded system parallel resonance frequency,
During the estimation of direct current sending end islanded system resonant frequency, it is considered to the impact that line charging is idle, thus it is actual to be more nearly system, carries
The accuracy of high computational analysis.The present invention is the side of a kind of convenient and practical estimation direct current sending end islanded system parallel resonance frequency
Method.
Accompanying drawing explanation
Fig. 1 is the implementing procedure figure of the inventive method.
Tu2Shi south electric network Chu Sui direct current sending end islanded system mode schematic diagram.
Fig. 3 is the harmonic impedance-frequency curve of system shown in Figure 2.
Detailed description of the invention
The method considering line charging idle estimation direct current sending end islanded system parallel resonance frequency that the present invention proposes, tool
Below the embodiment of body:
1) in the Power System Analysis programs such as BPA or PSS/E, AC network calculation of short-circuit current in islanded system is set up
By data, the data such as including electromotor, transformator, circuit, wherein count line charging idle, but do not included that current conversion station is idle
Compensate;
2) the Power System Analysis programs such as BPA or PSS/E are used to calculate capacity of short circuit S of change of current busAC;
3) current conversion station reactive compensation capacity Q is calculated according to current conversion station reactive-load compensation equipment parameterFilter, each according to current conversion station
Return back out idle total capacity Q of charging of the route parameter calculation circuit of lineLine;
4) according to fundamental frequency, AC system capacity of short circuit, current conversion station reactive compensation capacity, line charging reactive power,
Estimation parallel resonance frequency numerical value as follows:
Wherein fresFor resonant frequency, f1For fundamental frequency, K is proportionality coefficient, desirable 0~1.
Evaluation method provided by the present invention has obtained effectively under south electric network Chu Sui direct current sending end decoupled mode
Checking.
As a example by the Chu Sui direct current sending end islanded system method of operation shown in Fig. 2, it is considered to f1=50Hz, is calculated SAC
=5805MVA, QLine=911MVA, when current conversion station puts into 14 groups of idle groups, QFilter=2618MVA, takes K=1, by upper
State step and be calculated resonant frequency and be:
Which is carried out harmonic impedance scanning, and the harmonic impedance-frequency curve obtained is as shown in Figure 3, it is seen that resonance frequency
Rate about 69Hz, basically identical with estimation result.
Claims (3)
1. the method estimating direct current sending end islanded system parallel resonance frequency, humorous in estimation direct current sending end islanded system parallel connection
During vibration frequency, it is contemplated that the impact that line charging is idle, it is characterised in that estimation direct current sending end islanded system parallel resonance frequency
Method comprise the following steps:
1) set up AC network calculation of short-circuit current data in islanded system, wherein counted line charging idle, but do not wrapped
Include current conversion station reactive-load compensation;
2) capacity of short circuit S of change of current bus is calculatedAC;
3) current conversion station reactive compensation capacity Q is calculated according to current conversion station reactive-load compensation equipment parameterFilter, respectively return back out according to current conversion station
Idle total capacity Q of charging of the route parameter calculation circuit of lineLine;
4) according to fundamental frequency, AC system capacity of short circuit, current conversion station reactive compensation capacity, line charging reactive power, by with
Lower formula estimation parallel resonance frequency numerical value
Wherein fresFor resonant frequency, f1For fundamental frequency, K is proportionality coefficient.
2. according to the method for the estimation direct current sending end islanded system parallel resonance frequency described in claim 1, it is characterised in that
Above-mentioned steps 1) in AC network calculation of short-circuit current data include electromotor, transformator, track data.
3. according to the method for the estimation direct current sending end islanded system parallel resonance frequency described in claim 1, it is characterised in that
Above-mentioned steps 4) in Proportional coefficient K take 0~1.
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CN105548781A (en) * | 2016-02-15 | 2016-05-04 | 新疆金风科技股份有限公司 | Bus short-circuit capacity testing method, device and system |
CN113705132A (en) * | 2021-08-20 | 2021-11-26 | 广东电网有限责任公司 | Direct current loop resonance analysis method, device, equipment and storage medium |
Citations (4)
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CN102820673A (en) * | 2012-08-10 | 2012-12-12 | 沈阳工业大学 | Multiterminal flexible direct current power transmission system included power grid operation control system and method |
CN103023012A (en) * | 2012-11-25 | 2013-04-03 | 中国能源建设集团广东省电力设计研究院 | Design method of flexible direct-current transmission system converter station filter |
CN103048547A (en) * | 2012-12-07 | 2013-04-17 | 国网智能电网研究院 | Parameter designing method for smoothing reactor used for flexible direct-current power transmission |
CN103427433A (en) * | 2013-08-12 | 2013-12-04 | 浙江大学 | Calculation method for direct-current loop impedance of hybrid bipolar direct-current transmission system |
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CN102723726B (en) * | 2012-06-01 | 2014-02-12 | 中国电力科学研究院 | Method for determining maximal direct current receiving quantity in alternating current receiving system |
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CN102820673A (en) * | 2012-08-10 | 2012-12-12 | 沈阳工业大学 | Multiterminal flexible direct current power transmission system included power grid operation control system and method |
CN103023012A (en) * | 2012-11-25 | 2013-04-03 | 中国能源建设集团广东省电力设计研究院 | Design method of flexible direct-current transmission system converter station filter |
CN103048547A (en) * | 2012-12-07 | 2013-04-17 | 国网智能电网研究院 | Parameter designing method for smoothing reactor used for flexible direct-current power transmission |
CN103427433A (en) * | 2013-08-12 | 2013-12-04 | 浙江大学 | Calculation method for direct-current loop impedance of hybrid bipolar direct-current transmission system |
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