CN104734139A - Method for calculating transient state constant value of direct current filter element - Google Patents
Method for calculating transient state constant value of direct current filter element Download PDFInfo
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- CN104734139A CN104734139A CN201510141301.0A CN201510141301A CN104734139A CN 104734139 A CN104734139 A CN 104734139A CN 201510141301 A CN201510141301 A CN 201510141301A CN 104734139 A CN104734139 A CN 104734139A
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- filter
- lightning arrester
- direct
- filter element
- transient state
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/02—Arrangements for reducing harmonics or ripples
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides a method for calculating the transient state constant value of a direct current filter element. A simulation model is calculated and built, configuration and parameters of a lightning arrester in a direct current filter of a high voltage direct current power transmission system are determined by simulating the two fault conditions of a line-to-ground fault of a high voltage end or direct current electrode of the direct current filter and on-line invasive operation waves of the direct current electrode, and the overvoltage protection level and impact current data of each direct current filter element are obtained; simulation and analysis are carried out through the model, and the reference voltage, matching current, residual voltage, energy absorption capacity and other important parameters of the lightning arrester in the direct current filter can be determined; reliable operation of high voltage direct current power transmission project equipment is effectively guaranteed.
Description
Technical field
The invention belongs to technical field of direct current power transmission, relate to a kind of method calculating DC filter element transient state definite value.
Background technology
DC transmission system current conversion station is configured with the DC filter of some, runs the harmonic current produced in order to filtering converter, reduces the interference to adjacent communication circuit when direct current system is run.Hyper-Voltage of Power Systems is one of principal element of harm safe operation of power system.Direct current system is caused to stop transport once there is apparatus insulated breakdown accident after the overvoltage that DC transmission system produces suffering thunderbolt, operation, fault or other reason, just likely load center is caused to lose jumbo supply of electric power, and then jeopardizing the stable operation of large regional grid, consequence will be very serious.
Along with the raising of DC transmission system DC electric pressure, the possibility of the accident caused due to DC filter overvoltage is also more and more higher.At present the computational methods also not having standard are chosen to the transient state definite value of DC filter element, therefore, be necessary that setting up the transient state definite value of suitable model to DC filter element carries out simulation study.
Summary of the invention
The object of the present invention is to provide a kind of method calculating DC filter element transient state definite value, be used for determining the parameter of DC filter element, for the reliability service of high voltage direct current transmission project provides powerful guarantee.
For achieving the above object, the present invention by the following technical solutions:
Calculate a method for DC filter element transient state definite value, in power system simulation software, set up simulation model according to practical power systems operation conditions; Described simulation model comprises the DC filter be connected between polar curve and neutral bus, and DC filter is by high-voltage capacitor C1, and high voltage reactor L1, secondary capacitor C2 and low tension reactor L2 form; Lightning arrester Fdc1 is connected to the high-pressure side of high voltage reactor L1 and the low-pressure end of low tension reactor L2, and lightning arrester Fdc2 is connected to the two ends of low tension reactor L2, and neutral bus is connected with E lightning arrester over the ground;
Operate ripple fault condition by emulation DC filter high-pressure side or direct-current polar to earth fault and direct-current polar invade, determine the reference voltage of DC filter lightning arrester, coordinate electric current, residual voltage and energy absorption capability; And determine the overvoltage protection level of capacitor and reactor in DC filter and flow through the impulse current numerical value of equipment.
As the further preferred version of the present invention; when emulation DC filter high-pressure side or direct-current polar are to earth fault; charge to direct-current polar switching impulse level of protection to high-voltage capacitor C1, after high-voltage capacitor C1 charges, high-voltage capacitor C1 high-pressure side shorted to earth discharges.
As the further preferred version of the present invention, high-voltage capacitor C1 high-pressure side be connected between ground that variable inductance Lx represents that DC filter high-pressure side or direct-current polar diverse location occur to earth fault.
As the further preferred version of the present invention; when emulation direct-current polar invading operation ripple fault; polar curve applies the standard operation ripple that peak value is direct-current polar switching impulse level of protection, is used for calculating the switching impulse stress of DC filter lightning arrester and DC filter element.
As the further preferred version of the present invention, polar curve applies by power supply the standard operation ripple that a peak value is direct-current polar switching impulse level of protection.
As the further preferred version of the present invention; the situation that system reboot is dynamic is considered when determining DC filter lightning arrester absorption maximum energy; after DC filter high-pressure side or direct-current polar are to earth fault; DC line protection system attempts restarting several times, determines DC filter lightning arrester absorption maximum energy.
As the further preferred version of the present invention, be connected with in the DC filter of described simulation model and represent parasitic inductance of capacitor and the inductor being connected wire stray inductance.
As the further preferred version of the present invention, described lightning arrester Fdc1, lightning arrester Fdc1 and lightning arrester E are represented by nonlinear resistance.
Compared with prior art, the present invention builds simulation model, ripple fault condition is operated to earth fault and direct-current polar invade by emulation DC filter high-pressure side or direct-current polar, accurately can calculate the reference voltage of DC filter lightning arrester, coordinate electric current, the important parameter such as residual voltage and energy absorption capability, and determine insulation level and the impulse current data of capacitor and reactor in DC filter, prevent because overvoltage produces the apparatus insulated breakdown accident of DC filter caused, direct current system is avoided to stop transport, ensure the stable operation of large regional grid, for the reliability of high voltage direct current transmission project provides powerful guarantee.
Accompanying drawing explanation
Fig. 1 is DC filter element transient state fixed value calculation simulation model.
Embodiment
Describe the present invention below in conjunction with accompanying drawing:
Refer to shown in Fig. 1, in power system simulation software, set up simulation model according to practical power systems operation conditions; Calculate and when building simulation model, consider that DC filter high-pressure side or direct-current polar are to earth fault and direct-current polar invading operation ripple two kinds of fault conditions.Described simulation model comprises the DC filter be connected between high-voltage side bus and neutral bus, and DC filter is by high-voltage capacitor C1, and high voltage reactor L1, secondary capacitor C2 and low tension reactor L2 form; Each double-tuned filter is provided with two groups of lightning arresters.Lightning arrester Fdc1 is connected to the high-pressure side of high voltage reactor L1 and the low-pressure end of low tension reactor L2, and lightning arrester Fdc2 is connected to the two ends of low tension reactor L2, and neutral bus is connected with E lightning arrester over the ground; Need be accessed loop during simulation calculation, lightning arrester Fdc1, lightning arrester Fdc1 and lightning arrester E are represented by nonlinear resistance.
Operate ripple two kinds of fault conditions by emulation DC filter high-pressure side or direct-current polar to earth fault and direct-current polar invade, determine the reference voltage of DC filter lightning arrester, coordinate electric current, residual voltage and energy absorption capability; And determine the overvoltage protection level of capacitor and reactor in DC filter and flow through the impulse current numerical value of equipment.
To DC filter high-pressure side or direct-current polar over the ground fault simulation time, first charge to direct-current polar switching impulse level of protection (SIPL) to high-voltage capacitor C1, after high-voltage capacitor charging, capacitor high-pressure side shorted to earth discharges.DC filter high-pressure side (or direct-current polar) to earth fault need to consider direct-current polar diverse location to earth fault, represent with a variable inductance Lx in simulation model.
To earth fault occurrence positions from DC filter high-voltage capacitor high-pressure side more away from, variable inductance Lx value is larger.Stream filter high-pressure side or direct-current polar are to after earth fault, and DC line protection system can attempt restarting several times.The situation that system reboot is dynamic need be considered when determining DC filter lightning arrester absorption maximum energy.
To on direct-current polar invade operation ripple fault simulation time; with polar curve over the ground fault condition unlike; do not need to charge to capacitor when direct-current polar invades operation ripple; do not need the value in very large range changing Lx to find the maximum of filter each equipment transient state stress yet; only need to apply the standard operation ripple (250/2500 μ s) that a peak value is direct-current polar switching impulse level of protection (SIPL) on polar curve, be used for calculating the switching impulse stress of DC filter lightning arrester and DC filter element.
In addition, for practical operation situation, ground connection and earth electrode ground connection two kinds of situations in Converter Station should be considered, from both result of calculation, choose maximum stress.
The situation that system reboot is dynamic is considered when determining DC filter lightning arrester absorption maximum energy; after DC filter high-pressure side or direct-current polar are to earth fault; DC line protection system attempts restarting several times, determines DC filter lightning arrester absorption maximum energy.
Described simulation model considers the stray inductance of capacitor and the stray inductance being connected wire, is connected with and represents parasitic inductance of capacitor and the inductor being connected wire stray inductance in the DC filter of simulation model.
Described lightning arrester is represented by nonlinear resistance, and the volt-ampere characteristic that its characteristic is provided by lightning arrester producer determines.
The foregoing is only one embodiment of the present invention, is not whole or unique execution mode, to the conversion of any equivalence that technical solution of the present invention is taked, is claim of the present invention and contains.
Claims (8)
1. calculate a method for DC filter element transient state definite value, it is characterized in that: in power system simulation software, set up simulation model according to practical power systems operation conditions; Described simulation model comprises the DC filter be connected between polar curve and neutral bus, and DC filter is by high-voltage capacitor C1, and high voltage reactor L1, secondary capacitor C2 and low tension reactor L2 form; Lightning arrester Fdc1 is connected to the high-pressure side of high voltage reactor L1 and the low-pressure end of low tension reactor L2, and lightning arrester Fdc2 is connected to the two ends of low tension reactor L2, and neutral bus is connected with E lightning arrester over the ground;
Operate ripple fault condition by emulation DC filter high-pressure side or direct-current polar to earth fault and direct-current polar invade, determine the reference voltage of DC filter lightning arrester, coordinate electric current, residual voltage and energy absorption capability; And determine the overvoltage protection level of capacitor and reactor in DC filter and flow through the impulse current numerical value of equipment.
2. the method for calculating DC filter element transient state definite value according to claim 1; it is characterized in that: when emulation DC filter high-pressure side or direct-current polar are to earth fault; direct-current polar switching impulse level of protection is charged to high-voltage capacitor C1; after high-voltage capacitor C1 charges, high-voltage capacitor C1 high-pressure side shorted to earth discharges.
3. the method for calculating DC filter element transient state definite value according to claim 2, is characterized in that: high-voltage capacitor C1 high-pressure side be connected between ground that variable inductance Lx represents that DC filter high-pressure side or direct-current polar diverse location occur to earth fault.
4. the method for calculating DC filter element transient state definite value according to claim 1; it is characterized in that: when emulation direct-current polar invading operation ripple fault; polar curve applies the standard operation ripple that peak value is direct-current polar switching impulse level of protection, is used for calculating the switching impulse stress of DC filter lightning arrester and DC filter element.
5. the method for calculating DC filter element transient state definite value according to claim 4, is characterized in that: on polar curve, apply the standard operation ripple that a peak value is direct-current polar switching impulse level of protection by power supply.
6. the method for the calculating DC filter element transient state definite value according to any one of claim 1-5; it is characterized in that: consider the situation that system reboot is dynamic when determining DC filter lightning arrester absorption maximum energy; after DC filter high-pressure side or direct-current polar are to earth fault; DC line protection system attempts restarting several times, determines DC filter lightning arrester absorption maximum energy.
7. the method for the calculating DC filter element transient state definite value according to any one of claim 1-5, is characterized in that: be connected with in the DC filter of described simulation model and represent parasitic inductance of capacitor and the inductor being connected wire stray inductance.
8. the method for the calculating DC filter element transient state definite value according to any one of claim 1-5, is characterized in that: described lightning arrester Fdc1, lightning arrester Fdc1 and lightning arrester E are represented by nonlinear resistance.
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| CN201510141301.0A CN104734139A (en) | 2015-03-27 | 2015-03-27 | Method for calculating transient state constant value of direct current filter element |
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| CN201510141301.0A CN104734139A (en) | 2015-03-27 | 2015-03-27 | Method for calculating transient state constant value of direct current filter element |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107391810A (en) * | 2017-06-30 | 2017-11-24 | 中国西电电气股份有限公司 | A kind of method for calculating earthing pole lead monitoring arrangement element transient state rated value |
| CN108414862A (en) * | 2018-03-09 | 2018-08-17 | 中国南方电网有限责任公司超高压输电公司曲靖局 | High voltage direct current neutral bus arrester energy is resistant to on-line monitoring system and method |
| CN109995013A (en) * | 2019-03-27 | 2019-07-09 | 北京宇航***工程研究所 | A method of promoting the long line power supply dynamic response performance of aircraft |
| CN110867886A (en) * | 2019-11-28 | 2020-03-06 | 中国南方电网有限责任公司超高压输电公司广州局 | High-voltage direct-current transmission system inversion side modeling method |
| CN111639433A (en) * | 2020-06-02 | 2020-09-08 | 南方电网科学研究院有限责任公司 | Direct current filter design method and device based on electromagnetic transient simulation |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107391810A (en) * | 2017-06-30 | 2017-11-24 | 中国西电电气股份有限公司 | A kind of method for calculating earthing pole lead monitoring arrangement element transient state rated value |
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| CN108414862A (en) * | 2018-03-09 | 2018-08-17 | 中国南方电网有限责任公司超高压输电公司曲靖局 | High voltage direct current neutral bus arrester energy is resistant to on-line monitoring system and method |
| CN109995013A (en) * | 2019-03-27 | 2019-07-09 | 北京宇航***工程研究所 | A method of promoting the long line power supply dynamic response performance of aircraft |
| CN110867886A (en) * | 2019-11-28 | 2020-03-06 | 中国南方电网有限责任公司超高压输电公司广州局 | High-voltage direct-current transmission system inversion side modeling method |
| CN111639433A (en) * | 2020-06-02 | 2020-09-08 | 南方电网科学研究院有限责任公司 | Direct current filter design method and device based on electromagnetic transient simulation |
| CN111639433B (en) * | 2020-06-02 | 2023-05-23 | 南方电网科学研究院有限责任公司 | DC filter design method and device based on electromagnetic transient simulation |
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Application publication date: 20150624 |