CN113805094A - Method, device, equipment and medium for evaluating short-circuit ratio of high-voltage direct-current transmission system - Google Patents
Method, device, equipment and medium for evaluating short-circuit ratio of high-voltage direct-current transmission system Download PDFInfo
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Abstract
The invention discloses an evaluation method of a short-circuit ratio of a high-voltage direct-current transmission system, which comprises the following steps: when the switching state of the AC filter of the converter station is detected to change, acquiring the voltage values of an AC three-phase bus before and after switching; calculating the voltage change rate of the alternating-current bus before and after switching according to the voltage value of the alternating-current three-phase bus; calculating the short-circuit ratio of a converter bus according to the rated capacity of an alternating current filter bank of the converter station and the rated transmission capacity of the high-voltage direct current transmission system; acquiring a direct current power value transmitted by a high-voltage direct current transmission system and the number information of the running sets of the alternating current filters of the converter station in real time; calculating the effective short-circuit ratio of the current conversion bus; and evaluating the short-circuit ratio of the converter bus and the effective short-circuit ratio of the converter bus to obtain the system strength of an alternating current system connected with the high-voltage direct current transmission system, so that the problem of parameter drift can be effectively solved, and the accuracy of calculating the short-circuit ratio is improved. The invention also discloses an evaluation device, equipment and medium for the short-circuit ratio of the high-voltage direct-current transmission system.
Description
Technical Field
The invention relates to the technical field of high-voltage direct-current transmission systems, in particular to a method, a device, equipment and a medium for evaluating a short-circuit ratio of a high-voltage direct-current transmission system.
Background
China's coal resources are mainly distributed in the west and north regions, the water energy resources are mainly concentrated in the southwest region, and the eastern region is deficient in primary energy resources and relatively concentrated in power load. The imbalance between the energy resource and the distribution of the power load determines the necessity of the west-east power transmission. Due to the fact that the power transmission distance is long and the capacity is large, advantages of the high-voltage/extra-high-voltage direct-current power transmission technology are rapidly developed.
The operation of the high-voltage direct-current transmission system needs the alternating-current system to provide support of phase-change voltage, the safe and stable operation of the system depends on the strength of the alternating-current system, and the operation of the high-voltage direct-current system connected with the weak alternating-current system has related problems: high dynamic overvoltage, voltage instability, harmonic resonance and harmonic instability, fault recovery, transient instability and the like seriously affect the normal operation of the system. With the popularization of the application scene of the high-voltage direct-current transmission system, strength indexes for correspondingly judging the mutual influence of the alternating-current and direct-current systems are proposed in the industry: short circuit ratio and effective short circuit ratio. Therefore, accurate calculation of the real-time short-circuit ratio is of great significance to the operation of the high-voltage direct-current transmission system, wherein the solution of the short-circuit capacity of the alternating-current system is critical. At present, in the research aiming at the on-line calculation of the short circuit ratio and the effective short circuit ratio, the drift problem of thevenin equivalent parameters exists, and the real-time short circuit ratio cannot be accurately calculated.
Disclosure of Invention
The method, the device, the equipment and the medium for evaluating the short-circuit ratio of the high-voltage direct-current power transmission system, provided by the embodiment of the invention, can effectively solve the problem of parameter drift in the prior art and greatly improve the accuracy of calculating the short-circuit ratio.
An embodiment of the present invention provides a method for evaluating a short-circuit ratio of a high-voltage direct-current power transmission system, including:
when the switching state of the converter station AC filter is detected to change, acquiring the AC three-phase bus voltage value within a preset time before and after the switching of the converter station AC filter;
calculating the voltage change rate of the alternating-current bus before and after the switching of the alternating-current filter of the converter station according to the voltage value of the alternating-current three-phase bus;
calculating a converter bus short-circuit ratio of a converter station of the high-voltage direct-current transmission system according to a preset rated capacity of an alternating-current filter bank of the converter station, a rated transmission capacity of the high-voltage direct-current transmission system and a voltage change rate of the alternating-current bus;
acquiring the direct current power value transmitted by the high-voltage direct current transmission system and the group number information of the alternating current filter of the converter station in operation in real time;
calculating the effective short-circuit ratio of the converter bus of the converter station of the high-voltage direct-current transmission system according to the direct-current power value, the group number information, the voltage change rate of the alternating-current bus and the rated capacity;
and evaluating the short-circuit ratio of the converter bus of the converter station of the high-voltage direct-current transmission system and the effective short-circuit ratio of the converter bus to obtain the system strength of the alternating-current system connected with the high-voltage direct-current transmission system.
As an improvement of the above scheme, the calculating a rate of change of the ac bus voltage before and after switching of the ac filter of the converter station according to the ac three-phase bus voltage value specifically includes:
respectively converting the voltage values of the alternating-current three-phase bus before and after the switching of the alternating-current filter of the converter station to obtain the converted voltage values of the alternating-current three-phase bus;
respectively calculating an effective value of the alternating-current three-phase bus voltage before switching and an effective value of the alternating-current three-phase bus voltage after switching according to the transformed alternating-current three-phase bus voltage value;
and obtaining the voltage change rate of the alternating current bus before and after the switching of the alternating current filter of the converter station according to the effective value of the alternating current three-phase bus voltage before the switching, the effective value of the alternating current three-phase bus voltage after the switching and a preset effective value of the alternating current bus rated voltage.
As an improvement of the above scheme, the calculating a rate of change of the ac bus voltage before and after switching of the ac filter of the converter station according to the ac three-phase bus voltage value further includes:
respectively converting the alternating-current three-phase bus voltage values before and after switching of the alternating-current filter of the converter station by adopting a pre-established voltage conversion model to obtain the converted alternating-current three-phase bus voltage values; the voltage conversion model is determined by the following formula, and the specific formula is as follows:
wherein, Ua、Ub、UcIs the value of the AC three-phase bus voltage, ea、ebFor intermediate transformation parameters, ep1Is the first converted AC three-phase bus voltage value, ep2Is the second converted AC three-phase bus voltage value, eq1、eq2In order to be a parameter of the voltage transformation,
the angular frequency of the alternating current three-phase bus voltage signal;
the effective value of the alternating-current three-phase bus voltage is determined according to the following formula, wherein the specific formula is as follows:
wherein E isp1rmsIs the effective value of the first AC three-phase bus voltage, Ep2rmsIs the effective value of the second AC three-phase bus voltage, ErmsThe effective value of the alternating current three-phase bus voltage is obtained, and N is the number of sampling points;
obtaining the voltage change rate of the alternating current bus before and after the switching of the alternating current filter of the converter station according to a formula (7):
ΔUreci＝100*Min(0.01，Abs(Erms-before-Erms-after))/Uref (7)
wherein, Delta UreciTo the rate of change of the AC bus voltage, Erms-beforeEffective value of the AC three-phase bus voltage before switching, Erms-afterEffective value of the AC three-phase bus voltage after switching, UrefThe rated voltage effective value of the preset alternating current bus is obtained.
As an improvement of the above scheme, the calculating a converter bus short-circuit ratio of the converter station of the high-voltage direct-current transmission system according to a preset rated capacity of an alternating-current filter bank of the converter station, a preset rated transmission capacity of the high-voltage direct-current transmission system, and a preset alternating-current bus voltage change rate specifically includes:
obtaining a converter bus short-circuit ratio of the converter station of the high-voltage direct-current transmission system according to a formula (8):
SCRt eory＝Qacf-ref/(Pref*ΔUreci) (8)
wherein, SCRt eoryFor the short-circuit ratio of the commutation bus, Qacf-refIs the rated capacity, P, of the AC filter bank of the converter stationrefFor said rated delivery capacity, Δ UreciIs the ac bus voltage rate of change.
As an improvement of the above, the method further comprises:
acquiring a direct current power value transmitted by the high-voltage direct current transmission system according to a formula (9):
PUact＝Max(0.05*Pref，Pact) (9)
wherein, PUactFor said value of DC power, Pref，PactThe rated power value is a preset rated power value of the direct current transmission system;
obtaining an effective short-circuit ratio of a converter bus of the converter station of the high-voltage direct-current transmission system according to a formula (10):
wherein, ESCRACTFor the effective short-circuit ratio, Q, of the commutation busacf-refIs the rated capacity, Delta U, of the AC filter bank of the converter stationreciIs the rate of change of the AC bus voltage, NacfAnd the information of the number of the running sets of the AC filter of the converter station.
As an improvement of the above scheme, the evaluating a converter bus short-circuit ratio and a converter bus effective short-circuit ratio of a converter station of the high-voltage direct current transmission system to obtain a system strength of an alternating current system connected to the high-voltage direct current transmission system specifically includes:
when the short-circuit ratio of the converter bus is larger than zero and the effective short-circuit ratio of the converter bus is smaller than or equal to a preset first alternating-current system strength judgment standard threshold value, determining that the alternating-current system is in a weak system;
when the short-circuit ratio of the converter bus is greater than the first alternating-current system strength judgment standard threshold value and the effective short-circuit ratio of the converter bus is less than or equal to a preset second alternating-current system strength judgment standard threshold value, determining that the alternating-current system is in a middle system;
and when the short-circuit ratio of the commutation bus and the effective short-circuit ratio of the commutation bus are both larger than the second alternating-current system strength judgment standard threshold value, determining that the alternating-current system is in a strong system.
As an improvement of the above, the method further comprises:
when the switching state of the converter station AC filter is not changed, acquiring and evaluating a converter bus short-circuit ratio and a converter bus effective short-circuit ratio obtained by last switching of the converter station AC filter, and obtaining the system strength of an AC system connected with the current high-voltage DC transmission system.
An embodiment of the present invention provides an apparatus for evaluating a short-circuit ratio of a high-voltage direct-current power transmission system, including:
the alternating-current three-phase bus voltage value acquisition module is used for acquiring alternating-current three-phase bus voltage values within preset time before and after switching of the alternating-current filter of the convertor station when the switching state of the alternating-current filter of the convertor station is detected to change;
the alternating-current bus voltage change rate calculation module is used for calculating the alternating-current bus voltage change rate before and after the switching of the alternating-current filter of the converter station according to the alternating-current three-phase bus voltage value;
the converter bus short-circuit ratio calculation module is used for calculating the converter bus short-circuit ratio of the converter station of the high-voltage direct-current transmission system according to the preset rated capacity of the converter station alternating-current filter bank, the rated transmission capacity of the high-voltage direct-current transmission system and the change rate of the alternating-current bus voltage;
the real-time data acquisition module is used for acquiring the direct-current power value transmitted by the high-voltage direct-current power transmission system and the group number information of the alternating-current filters in operation of the converter station in real time;
the converter bus effective short-circuit ratio calculation module is used for calculating the converter bus effective short-circuit ratio of the high-voltage direct-current transmission system converter station according to the direct-current power value, the group number information, the alternating-current bus voltage change rate and the rated capacity;
and the alternating current system strength analysis module is used for evaluating the short-circuit ratio of the converter bus of the converter station of the high-voltage direct current transmission system and the effective short-circuit ratio of the converter bus to obtain the system strength of the alternating current system connected with the high-voltage direct current transmission system.
Compared with the prior art, the method, the device, the equipment and the medium for evaluating the short-circuit ratio of the high-voltage direct-current transmission system disclosed by the embodiment of the invention have the following beneficial effects:
when the switching state of the AC filter of the converter station is detected to change, acquiring the voltage value of an AC three-phase bus within a preset time before and after the AC filter of the converter station is switched, calculating the voltage change rate of the AC bus before and after the AC filter of the converter station is switched according to the voltage value of the AC three-phase bus, calculating the short-circuit ratio of the converter bus of the converter station of the high-voltage DC transmission system according to the rated capacity of a preset AC filter set of the converter station, the rated transmission capacity of the high-voltage DC transmission system and the voltage change rate of the AC bus, acquiring the DC power value transmitted by the high-voltage DC transmission system and the set number information of the AC filter of the converter station in real time, and calculating the effective short-circuit ratio of the converter bus of the converter station of the high-voltage DC transmission system according to the DC power value, the set number information, the voltage change rate of the AC bus and the rated capacity, the short-circuit ratio of the converter bus and the effective short-circuit ratio of the converter bus of the converter station of the high-voltage direct-current transmission system are evaluated to obtain the system strength of the alternating-current system connected with the high-voltage direct-current transmission system, so that the problem of parameter drift in the prior art can be effectively solved, and the problem of numerical value oscillation caused by small alternating-current voltage fluctuation due to system harmonic interference and alternating-current filter switching can be solved, so that the accuracy of short-circuit ratio calculation is greatly improved, and the method has the characteristics of low cost, high efficiency, large benefit and wide application prospect in the field of high-voltage direct-current converter stations.
Another embodiment of the present invention provides an apparatus for evaluating a short-circuit ratio of a high-voltage direct-current power transmission system, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the method for evaluating a short-circuit ratio of a high-voltage direct-current power transmission system according to the above embodiment of the present invention when executing the computer program.
Another embodiment of the present invention provides a storage medium, where the computer-readable storage medium includes a stored computer program, where when the computer program runs, a device in which the computer-readable storage medium is located is controlled to execute the method for evaluating a short-circuit ratio of a high-voltage direct-current power transmission system according to the above-described embodiment of the present invention.
Drawings
Fig. 1 is a schematic flow chart of a method for evaluating a short-circuit ratio of a high-voltage direct-current transmission system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an apparatus for evaluating a short-circuit ratio of a hvdc transmission system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic flow chart of a method for evaluating a short-circuit ratio of a high-voltage direct-current power transmission system according to an embodiment of the present invention is shown, where the method includes steps S101 to S106.
S101, when the switching state of the converter station alternating current filter is detected to change, obtaining the alternating current three-phase bus voltage value in the preset time before and after the converter station alternating current filter is switched.
Preferably, step S101 is preceded by: and detecting whether the AC filter of the converter station is switched or not. Optionally, when it is detected that the switching state of the ac filter of the converter station changes, real-time information of the switching state of the ac filter is obtained. The real-time information of the switching state specifically includes an alternating-current three-phase bus voltage value within delta t time before the switching of the alternating-current filter and an alternating-current three-phase bus voltage value within delta t time after the switching of the alternating-current filter, wherein the switching on/off state of the alternating-current filter is used as a boundary.
In an optional embodiment, when it is detected that the switching state of the converter station ac filter is not changed, a converter bus short-circuit ratio and a converter bus effective short-circuit ratio obtained by last switching of the converter station ac filter are obtained and evaluated, so as to obtain the system strength of the ac system to which the current high-voltage dc transmission system is connected.
And S102, calculating the voltage change rate of the alternating-current bus before and after the switching of the alternating-current filter of the converter station according to the voltage value of the alternating-current three-phase bus.
In one embodiment, step S102 includes:
respectively converting the voltage values of the alternating-current three-phase bus before and after the switching of the alternating-current filter of the converter station to obtain the converted voltage values of the alternating-current three-phase bus;
respectively calculating an effective value of the alternating-current three-phase bus voltage before switching and an effective value of the alternating-current three-phase bus voltage after switching according to the transformed alternating-current three-phase bus voltage value;
and obtaining the voltage change rate of the alternating current bus before and after the switching of the alternating current filter of the converter station according to the effective value of the alternating current three-phase bus voltage before the switching, the effective value of the alternating current three-phase bus voltage after the switching and a preset effective value of the alternating current bus rated voltage.
It should be noted that the rated transmission capacity P of the high-voltage direct-current transmission system is preset in the inventionrefRated voltage effective value U of AC busrefRated capacity Q of ac filter bank of converter stationacf-ref. Further, the converted ac three-phase bus voltage values are low-pass filtered in consideration of the influence of harmonics, respectively, so that the filtered values are subjected to calculation of the ac three-phase bus voltage effective values. Furthermore, when the switching state of the AC filter of the converter station is detected to occurWhen the voltage of the alternating current bus changes, the effective value of the alternating current three-phase bus voltage in delta t time before the switching of the alternating current filter and the effective value of the alternating current three-phase bus voltage in delta t time after the switching are respectively calculated, and then the change rate of the alternating current bus voltage in the switching process is obtained.
In another embodiment, step S102 includes:
respectively converting the alternating-current three-phase bus voltage values before and after switching of the alternating-current filter of the converter station by adopting a pre-established voltage conversion model to obtain the converted alternating-current three-phase bus voltage values; the voltage conversion model is determined by the following formula, and the specific formula is as follows:
wherein, Ua、Ub、UcIs the value of the AC three-phase bus voltage, ea、ebFor intermediate transformation parameters, ep1Is the first converted AC three-phase bus voltage value, ep2Is the second converted AC three-phase bus voltage value, eq1、eq2In order to be a parameter of the voltage transformation,
the angular frequency of the alternating current three-phase bus voltage signal;
the effective value of the alternating-current three-phase bus voltage is determined according to the following formula, wherein the specific formula is as follows:
wherein E isp1rmsIs the effective value of the first AC three-phase bus voltage, Ep2rmsIs the effective value of the second AC three-phase bus voltage, ErmsThe effective value of the alternating current three-phase bus voltage is shown, and N is the number of sampling points. In this embodiment, the effective value E of the ac three-phase bus voltage before switching can be calculated based on the voltage transformation modelrms-beforeAnd the effective value E of the voltage of the switched alternating-current three-phase busrms-after. In order to improve the accuracy of the calculated value, the average value of the first alternating-current three-phase bus voltage effective value and the second alternating-current three-phase bus voltage effective value is taken as the alternating-current three-phase bus voltage effective value of the embodiment.
In some embodiments, the ac bus voltage change rate before and after switching of the ac filter of the converter station is obtained according to formula (7):
ΔUreci＝100*Min(0.01，Abs(Erms-before-Erms-after))/Uref (7)
wherein, Delta UreciTo the rate of change of the AC bus voltage, Erms-beforeEffective value of the AC three-phase bus voltage before switching, Erms-afterEffective value of the AC three-phase bus voltage after switching, UrefThe rated voltage effective value of the preset alternating current bus is obtained.
S103, calculating the short-circuit ratio of the converter bus of the converter station of the high-voltage direct-current transmission system according to the preset rated capacity of the alternating-current filter bank of the converter station, the rated transmission capacity of the high-voltage direct-current transmission system and the voltage change rate of the alternating-current bus.
In a preferred embodiment, step S103 includes:
obtaining a converter bus short-circuit ratio of the converter station of the high-voltage direct-current transmission system according to a formula (8):
SCRt eory＝Qacf-ref/(Pref*ΔUreci) (8)
wherein, SCRt eoryFor the short-circuit ratio of the commutation bus, Qacf-refIs the rated capacity, P, of the AC filter bank of the converter stationrefFor said rated delivery capacity, Δ UreciIs the ac bus voltage rate of change.
And S104, acquiring the direct current power value transmitted by the high-voltage direct current transmission system and the group number information of the alternating current filter of the converter station in real time.
Preferably, the value of the dc power transmitted by the hvdc transmission system is obtained according to formula (9):
PUact＝Max(0.05*Pref，Pact) (9)
wherein, PUactFor said value of DC power, Pref，PactThe rated power value of the direct current transmission system is preset. In addition, the running group number information of the converter station alternating current filter is specifically the running group number information of the alternating current filter after the current converter station alternating current filter is switched.
And S105, calculating the effective short-circuit ratio of the converter bus of the converter station of the high-voltage direct-current transmission system according to the direct-current power value, the group number information, the voltage change rate of the alternating-current bus and the rated capacity.
In a preferred embodiment, step S105 includes:
obtaining an effective short-circuit ratio of a converter bus of the converter station of the high-voltage direct-current transmission system according to a formula (10):
wherein, ESCRACTFor the effective short-circuit ratio, Q, of the commutation busacf-refIs the rated capacity, Delta U, of the AC filter bank of the converter stationreciIs the said communication busRate of change of line voltage, NacfInformation on the number of sets in operation of the AC filter of said converter station
And S106, evaluating the short-circuit ratio of the converter bus and the effective short-circuit ratio of the converter bus of the converter station of the high-voltage direct-current transmission system to obtain the system strength of the alternating-current system connected with the high-voltage direct-current transmission system.
In a preferred embodiment, step S106 includes:
when the short-circuit ratio of the converter bus is larger than zero and the effective short-circuit ratio of the converter bus is smaller than or equal to a preset first alternating-current system strength judgment standard threshold value, determining that the alternating-current system is in a weak system;
when the short-circuit ratio of the converter bus is greater than the first alternating-current system strength judgment standard threshold value and the effective short-circuit ratio of the converter bus is less than or equal to a preset second alternating-current system strength judgment standard threshold value, determining that the alternating-current system is in a middle system;
and when the short-circuit ratio of the commutation bus and the effective short-circuit ratio of the commutation bus are both larger than the second alternating-current system strength judgment standard threshold value, determining that the alternating-current system is in a strong system.
Note that, the threshold S of the ac system intensity determination criterion is set in advance1，S2And further judging the system strength of an alternating current system connected with the high-voltage direct current transmission system according to the short-circuit ratio of the converter bus and the effective short circuit of the converter bus and the preset system strength judgment condition. Illustratively, the system strength determination condition includes 0 < SCRt eory、ESCRACT≤S1As a condition for determining that the alternating current system is in a weak system; the system intensity determination condition includes S1＜SCRt eory、ESCRACT≤S2As a condition for determining that the alternating current system is in the middle system; the system intensity determination condition includes S2＜SCRt eory、ESCRACTAs a condition for determining that the alternating current system is in a strong system.
The method for evaluating the short-circuit ratio of the high-voltage direct-current transmission system provided by one embodiment of the invention includes the steps of obtaining an alternating-current three-phase bus voltage value in a preset time before and after the switching of an alternating-current filter of a converter station when the switching state of the alternating-current filter of the converter station is detected to change, calculating the alternating-current bus voltage change rate before and after the switching of the alternating-current filter of the converter station according to the alternating-current three-phase bus voltage value, calculating the short-circuit ratio of a converter bus of the high-voltage direct-current transmission system according to the rated capacity of a preset alternating-current filter group of the converter station, the rated transmission capacity of the high-voltage direct-current transmission system and the alternating-current bus voltage change rate, obtaining the direct-current power value transmitted by the high-voltage direct-current transmission system and the group number information of the alternating-current filter in operation in real time, and obtaining the group number information of the high-voltage direct-current transmission system and the group number information of the alternating-current bus voltage change rate and the rated capacity, and calculating the effective short-circuit ratio of the converter bus of the converter station of the high-voltage direct-current transmission system, and evaluating the effective short-circuit ratio of the converter bus and the effective short-circuit ratio of the converter bus of the converter station of the high-voltage direct-current transmission system to obtain the system strength of an alternating-current system connected with the high-voltage direct-current transmission system, so that the parameter drift problem in the prior art can be effectively solved, and the numerical value oscillation problem caused by small alternating-current voltage fluctuation caused by system harmonic interference and alternating-current filter switching can be solved, thereby greatly improving the accuracy of calculating the short-circuit ratio, and having the characteristics of low cost, high efficiency, large benefit and large application prospect in the field of high-voltage direct-current converter stations.
Referring to fig. 2, a schematic structural diagram of an apparatus for evaluating a short-circuit ratio of a hvdc transmission system according to an embodiment of the present invention is shown, including:
the alternating-current three-phase bus voltage value obtaining module 201 is configured to obtain an alternating-current three-phase bus voltage value within a preset time before and after switching of an alternating-current filter of a converter station when it is detected that a switching state of the alternating-current filter of the converter station changes;
the alternating-current bus voltage change rate calculation module 202 is used for calculating the alternating-current bus voltage change rate before and after the switching of the alternating-current filter of the converter station according to the alternating-current three-phase bus voltage value;
the converter bus short-circuit ratio calculation module 203 is used for calculating the converter bus short-circuit ratio of the converter station of the high-voltage direct-current transmission system according to the preset rated capacity of the converter station alternating-current filter bank, the rated transmission capacity of the high-voltage direct-current transmission system and the change rate of the alternating-current bus voltage;
a real-time data obtaining module 204, configured to obtain, in real time, a dc power value transmitted by the high-voltage dc transmission system and group number information of the ac filters in the converter station;
a converter bus effective short-circuit ratio calculation module 205, configured to calculate a converter bus effective short-circuit ratio of the converter station of the high-voltage direct-current transmission system according to the dc power value, the group number information, the ac bus voltage change rate, and the rated capacity;
and the alternating current system strength analysis module 206 is configured to evaluate a converter bus short-circuit ratio and a converter bus effective short-circuit ratio of the converter station of the high-voltage direct current transmission system, so as to obtain a system strength of an alternating current system to which the high-voltage direct current transmission system is connected.
Preferably, the ac bus voltage change rate calculation module 202 includes:
the conversion unit is used for respectively converting the voltage values of the alternating-current three-phase bus before and after the switching of the alternating-current filter of the converter station to obtain the converted voltage values of the alternating-current three-phase bus;
the alternating current three-phase bus voltage effective value calculating unit is used for calculating an alternating current three-phase bus voltage effective value before switching and an alternating current three-phase bus voltage effective value after switching respectively according to the transformed alternating current three-phase bus voltage value;
and the alternating current bus voltage change rate calculation unit before and after switching is used for obtaining the alternating current bus voltage change rate before and after switching of the converter station alternating current filter according to the alternating current three-phase bus voltage effective value before switching, the alternating current three-phase bus voltage effective value after switching and a preset alternating current bus rated voltage effective value.
Preferably, the ac bus voltage change rate calculation module 202 further includes:
the voltage value conversion unit is used for respectively converting the alternating current three-phase bus voltage values before and after the switching of the alternating current filter of the converter station by adopting a pre-established voltage conversion model to obtain the converted alternating current three-phase bus voltage values; the voltage conversion model is determined by the following formula, and the specific formula is as follows:
wherein, Ua、Ub、UcIs the value of the AC three-phase bus voltage, ea、ebFor intermediate transformation parameters, ep1Is the first converted AC three-phase bus voltage value, ep2Is the second converted AC three-phase bus voltage value, eq1、eq2In order to be a parameter of the voltage transformation,
the angular frequency of the alternating current three-phase bus voltage signal;
the alternating-current three-phase bus voltage effective value obtaining unit is used for determining the alternating-current three-phase bus voltage effective value according to the following formula, wherein the specific formula is as follows:
wherein E isp1rmsIs the effective value of the first AC three-phase bus voltage, Ep2rmsIs the effective value of the second AC three-phase bus voltage, ErmsThe effective value of the alternating current three-phase bus voltage is obtained, and N is the number of sampling points;
the alternating current bus voltage change rate obtaining unit is used for obtaining the alternating current bus voltage change rate before and after the switching of the alternating current filter of the converter station according to a formula (7):
ΔUreci＝100*Min(0.01，Abs(Erms-before-Erms-after))/Uref (7)
wherein, Delta UreciTo the rate of change of the AC bus voltage, Erms-beforeEffective value of the AC three-phase bus voltage before switching, Erms-afterEffective value of the AC three-phase bus voltage after switching, UrefThe rated voltage effective value of the preset alternating current bus is obtained.
Preferably, the commutation bus short-circuit ratio calculation module 203 includes:
the converter bus short-circuit ratio obtaining unit is used for obtaining the converter bus short-circuit ratio of the converter station of the high-voltage direct-current transmission system according to a formula (8):
SCRt eory＝Qacf-ref/(Pref*ΔUreci) (8)
wherein, SCRt eoryFor the short-circuit ratio of the commutation bus, Qacf-refIs the rated capacity, P, of the AC filter bank of the converter stationrefFor said rated delivery capacity, Δ UreciIs the ac bus voltage rate of change.
Preferably, the real-time data obtaining module 204 includes:
a current dc power value obtaining unit, configured to obtain a dc power value transmitted by the high-voltage dc power transmission system according to formula (9):
PUact＝Max(0.05*Pref，Pact) (9)
wherein, PUactFor said value of DC power, Pref，PactThe rated power value of the direct current transmission system is preset.
Preferably, the commutation bus effective short-circuit ratio calculation module 205 includes:
the converter bus effective short-circuit ratio obtaining unit is used for obtaining the converter bus effective short-circuit ratio of the converter station of the high-voltage direct-current transmission system according to a formula (10):
wherein, ESCRACTFor the effective short-circuit ratio, Q, of the commutation busacf-refIs the rated capacity, Delta U, of the AC filter bank of the converter stationreciIs the rate of change of the AC bus voltage, NacfAnd the information of the number of the running sets of the AC filter of the converter station.
Preferably, the ac system intensity analyzing module 206 includes:
the first system strength judging unit is used for determining that the alternating current system is in a weak system when the short-circuit ratio of the converter bus is larger than zero and the effective short-circuit ratio of the converter bus is smaller than or equal to a preset first alternating current system strength judging standard threshold value;
the second system strength judging unit is used for determining that the alternating current system is in a middle system when the short-circuit ratio of the converter bus is greater than the first alternating current system strength judging standard threshold value and the effective short-circuit ratio of the converter bus is less than or equal to a preset second alternating current system strength judging standard threshold value;
and the third system strength judging unit is used for determining that the alternating current system is in a strong system when the short-circuit ratio of the converter bus and the effective short-circuit ratio of the converter bus are both greater than the second alternating current system strength judging standard threshold value.
Preferably, the apparatus for evaluating the short-circuit ratio of a hvdc transmission system further comprises:
and the non-switching operation module is used for acquiring and evaluating a converter bus short-circuit ratio and a converter bus effective short-circuit ratio obtained by last switching of the converter station AC filter when the switching state of the converter station AC filter is not changed, so as to obtain the system strength of the AC system connected with the current high-voltage DC transmission system.
The device for evaluating the short-circuit ratio of the high-voltage direct-current transmission system provided by the embodiment of the invention is characterized in that when the switching state of the alternating-current filter of the converter station is detected to change, the voltage value of an alternating-current three-phase bus in a preset time before and after the switching of the alternating-current filter of the converter station is obtained, the voltage change rate of the alternating-current bus before and after the switching of the alternating-current filter of the converter station is calculated according to the voltage value of the alternating-current three-phase bus, the short-circuit ratio of the converter bus of the converter station of the high-voltage direct-current transmission system is calculated according to the rated capacity of a preset alternating-current filter group of the converter station, the rated transmission capacity of the high-voltage direct-current transmission system and the group number information of the alternating-current filter in operation of the converter station are obtained in real time, and the direct-current power value and the group number information of the group number of the high-voltage direct-current transmission system, the alternating-current bus voltage change rate and the rated capacity are obtained according to the direct current power value, the group number information, the alternating-current bus voltage change rate and the rated capacity, and calculating the effective short-circuit ratio of the converter bus of the converter station of the high-voltage direct-current transmission system, and evaluating the effective short-circuit ratio of the converter bus and the effective short-circuit ratio of the converter bus of the converter station of the high-voltage direct-current transmission system to obtain the system strength of an alternating-current system connected with the high-voltage direct-current transmission system, so that the parameter drift problem in the prior art can be effectively solved, and the numerical value oscillation problem caused by small alternating-current voltage fluctuation caused by system harmonic interference and alternating-current filter switching can be solved, thereby greatly improving the accuracy of calculating the short-circuit ratio, and having the characteristics of low cost, high efficiency, large benefit and large application prospect in the field of high-voltage direct-current converter stations.
The evaluation equipment for the short-circuit ratio of the high-voltage direct-current power transmission system comprises the following components: a processor, a memory and a computer program stored in said memory and executable on said processor, such as an evaluation program of the short-circuit ratio of the hvdc transmission system. The processor realizes the steps in the above-described embodiments of the method for evaluating the short-circuit ratio of the respective hvdc transmission system when executing the computer program. Alternatively, the processor implements the functions of the modules/units in the above device embodiments when executing the computer program.
Illustratively, the computer program may be partitioned into one or more modules/units that are stored in the memory and executed by the processor to implement the invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program in the evaluation device of the short-circuit ratio of the hvdc transmission system.
The evaluation equipment of the short-circuit ratio of the high-voltage direct-current power transmission system can be computing equipment such as a desktop computer, a notebook computer, a palm computer and a cloud server. The evaluation equipment for the short-circuit ratio of the high-voltage direct-current power transmission system can comprise, but is not limited to, a processor and a memory. It will be appreciated by a person skilled in the art that the schematic diagram is merely an example of an evaluation device for short-circuit ratio of a hvdc transmission system and does not constitute a limitation of an evaluation device for short-circuit ratio of a hvdc transmission system, and may comprise more or less components than those shown, or some components in combination, or different components, e.g. the evaluation device for short-circuit ratio of a hvdc transmission system may further comprise input output devices, network access devices, buses, etc.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general processor may be a microprocessor or the processor may be any conventional processor or the like, said processor being the control center of the evaluation equipment of the short circuit ratio of the hvdc transmission system, the various parts of the evaluation equipment of the short circuit ratio of the entire hvdc transmission system being connected by means of various interfaces and lines.
The memory may be adapted to store the computer program and/or module, and the processor may be adapted to perform the various functions of the apparatus for assessing the short-circuit ratio of a hvdc power transmission system by executing or executing the computer program and/or module stored in the memory and by invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
Wherein the modules/units integrated with the short-circuit ratio evaluation device of the HVDC transmission system, if implemented in the form of software functional units and sold or used as separate products, can be stored in a computer-readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A method for evaluating a short-circuit ratio of a high-voltage direct-current transmission system is characterized by comprising the following steps:
when the switching state of the converter station AC filter is detected to change, acquiring the AC three-phase bus voltage value within a preset time before and after the switching of the converter station AC filter;
calculating the voltage change rate of the alternating-current bus before and after the switching of the alternating-current filter of the converter station according to the voltage value of the alternating-current three-phase bus;
calculating a converter bus short-circuit ratio of a converter station of the high-voltage direct-current transmission system according to a preset rated capacity of an alternating-current filter bank of the converter station, a rated transmission capacity of the high-voltage direct-current transmission system and a voltage change rate of the alternating-current bus;
acquiring the direct current power value transmitted by the high-voltage direct current transmission system and the group number information of the alternating current filter of the converter station in operation in real time;
calculating the effective short-circuit ratio of the converter bus of the converter station of the high-voltage direct-current transmission system according to the direct-current power value, the group number information, the voltage change rate of the alternating-current bus and the rated capacity;
and evaluating the short-circuit ratio of the converter bus of the converter station of the high-voltage direct-current transmission system and the effective short-circuit ratio of the converter bus to obtain the system strength of the alternating-current system connected with the high-voltage direct-current transmission system.
2. The method for evaluating the short-circuit ratio of the hvdc transmission system according to claim 1, wherein said calculating the ac bus voltage change rate before and after switching of the ac filter of the converter station according to the ac three-phase bus voltage value specifically comprises:
respectively converting the voltage values of the alternating-current three-phase bus before and after the switching of the alternating-current filter of the converter station to obtain the converted voltage values of the alternating-current three-phase bus;
respectively calculating an effective value of the alternating-current three-phase bus voltage before switching and an effective value of the alternating-current three-phase bus voltage after switching according to the transformed alternating-current three-phase bus voltage value;
and obtaining the voltage change rate of the alternating current bus before and after the switching of the alternating current filter of the converter station according to the effective value of the alternating current three-phase bus voltage before the switching, the effective value of the alternating current three-phase bus voltage after the switching and a preset effective value of the alternating current bus rated voltage.
3. The method according to claim 2, wherein the calculating a rate of change of the ac bus voltage before and after switching of the ac filter of the converter station according to the ac three-phase bus voltage value further comprises:
respectively converting the alternating-current three-phase bus voltage values before and after switching of the alternating-current filter of the converter station by adopting a pre-established voltage conversion model to obtain the converted alternating-current three-phase bus voltage values; the voltage conversion model is determined by the following formula, and the specific formula is as follows:
wherein, Ua、Ub、UcIs the value of the AC three-phase bus voltage, ea、ebFor intermediate transformation parameters, ep1Is the first converted AC three-phase bus voltage value, ep2Is the second converted AC three-phase bus voltage value, eq1、eq2In order to be a parameter of the voltage transformation,
the angular frequency of the alternating current three-phase bus voltage signal;
the effective value of the alternating-current three-phase bus voltage is determined according to the following formula, wherein the specific formula is as follows:
wherein E isp1rmsIs the effective value of the first AC three-phase bus voltage, Ep2rmsIs the effective value of the second AC three-phase bus voltage, ErmsThe effective value of the alternating current three-phase bus voltage is obtained, and N is the number of sampling points;
obtaining the voltage change rate of the alternating current bus before and after the switching of the alternating current filter of the converter station according to a formula (7):
ΔUreci＝100*Min(0.01，Abs(Erms-before-Erms-after))/Uref (7)
wherein, Delta UreciTo the rate of change of the AC bus voltage, Erms-beforeEffective value of the AC three-phase bus voltage before switching, Erms-afterEffective value of the AC three-phase bus voltage after switching, UrefThe rated voltage effective value of the preset alternating current bus is obtained.
4. The method for evaluating the short-circuit ratio of the hvdc transmission system according to claim 1, wherein said calculating the short-circuit ratio of the converter bus of the converter station of the hvdc transmission system according to the preset rated capacity of the ac filter bank of the converter station, the rated transmission capacity of the hvdc transmission system and the variation rate of the ac bus voltage comprises:
obtaining a converter bus short-circuit ratio of the converter station of the high-voltage direct-current transmission system according to a formula (8):
SCRt eory＝Qacf-ref/(Pref*ΔUreci) (8)
wherein, SCRt eoryFor the short-circuit ratio of the commutation bus, Qacf-refIs the rated capacity, P, of the AC filter bank of the converter stationrefFor said rated delivery capacity, Δ UreciIs the ac bus voltage rate of change.
5. The method of evaluating short circuit ratio in an hvdc transmission system according to claim 1, further comprising:
acquiring a direct current power value transmitted by the high-voltage direct current transmission system according to a formula (9):
PUact＝Max(0.05*Pref，Pact) (9)
wherein, PUactFor said value of DC power, Pref，PactThe rated power value is a preset rated power value of the direct current transmission system;
obtaining an effective short-circuit ratio of a converter bus of the converter station of the high-voltage direct-current transmission system according to a formula (10):
wherein, ESCRACTFor the effective short-circuit ratio, Q, of the commutation busacf-refIs the rated capacity, Delta U, of the AC filter bank of the converter stationreciIs the rate of change of the AC bus voltage, NacfAnd the information of the number of the running sets of the AC filter of the converter station.
6. The method according to claim 1, wherein the evaluating a converter bus short circuit ratio and a converter bus effective short circuit ratio of a converter station of the hvdc transmission system to obtain a system strength of an ac system to which the hvdc transmission system is connected comprises:
when the short-circuit ratio of the converter bus is larger than zero and the effective short-circuit ratio of the converter bus is smaller than or equal to a preset first alternating-current system strength judgment standard threshold value, determining that the alternating-current system is in a weak system;
when the short-circuit ratio of the converter bus is greater than the first alternating-current system strength judgment standard threshold value and the effective short-circuit ratio of the converter bus is less than or equal to a preset second alternating-current system strength judgment standard threshold value, determining that the alternating-current system is in a middle system;
and when the short-circuit ratio of the commutation bus and the effective short-circuit ratio of the commutation bus are both larger than the second alternating-current system strength judgment standard threshold value, determining that the alternating-current system is in a strong system.
7. The method of evaluating short circuit ratio in an hvdc transmission system according to claim 1, further comprising:
when the switching state of the converter station AC filter is not changed, acquiring and evaluating a converter bus short-circuit ratio and a converter bus effective short-circuit ratio obtained by last switching of the converter station AC filter, and obtaining the system strength of an AC system connected with the current high-voltage DC transmission system.
8. An apparatus for assessing the short-circuit ratio of a HVDC transmission system, comprising:
the alternating-current three-phase bus voltage value acquisition module is used for acquiring alternating-current three-phase bus voltage values within preset time before and after switching of the alternating-current filter of the convertor station when the switching state of the alternating-current filter of the convertor station is detected to change;
the alternating-current bus voltage change rate calculation module is used for calculating the alternating-current bus voltage change rate before and after the switching of the alternating-current filter of the converter station according to the alternating-current three-phase bus voltage value;
the converter bus short-circuit ratio calculation module is used for calculating the converter bus short-circuit ratio of the converter station of the high-voltage direct-current transmission system according to the preset rated capacity of the converter station alternating-current filter bank, the rated transmission capacity of the high-voltage direct-current transmission system and the change rate of the alternating-current bus voltage;
the real-time data acquisition module is used for acquiring the direct-current power value transmitted by the high-voltage direct-current power transmission system and the group number information of the alternating-current filters in operation of the converter station in real time;
the converter bus effective short-circuit ratio calculation module is used for calculating the converter bus effective short-circuit ratio of the high-voltage direct-current transmission system converter station according to the direct-current power value, the group number information, the alternating-current bus voltage change rate and the rated capacity;
and the alternating current system strength analysis module is used for evaluating the short-circuit ratio of the converter bus of the converter station of the high-voltage direct current transmission system and the effective short-circuit ratio of the converter bus to obtain the system strength of the alternating current system connected with the high-voltage direct current transmission system.
9. An evaluation apparatus of a short-circuit ratio of a high-voltage direct current transmission system, comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the evaluation method of a short-circuit ratio of a high-voltage direct current transmission system according to any of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, comprising a stored computer program, wherein the computer program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform a method of assessing short-circuit ratio in an hvdc power transmission system as claimed in any of claims 1 to 7.
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| JIAYUAN ZHANG等: "On-line diagnosis of inter-turn short circuit fault for DC brushed motor", 《ISA TRANSACTIONS》, vol. 77, pages 179 - 187 * |
| 田宝烨 等: "一种通用的多直流馈入系统短路比指标", 《南方电网技术》, vol. 13, no. 8, pages 1 - 8 * |
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