CN110247401B - Voltage compensation method and device of controllable voltage source - Google Patents
Voltage compensation method and device of controllable voltage source Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
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Abstract
The application discloses a voltage compensation method and a voltage compensation device of a controllable voltage source, wherein when a power distribution network system normally operates, first all-phase voltage, second all-phase voltage and third all-phase voltage of the power distribution network system are obtained, first current corresponding to the controllable voltage source when the controllable voltage source outputs first detection voltage is obtained, second current corresponding to the controllable voltage source when the controllable voltage source outputs second detection voltage is obtained, and zero sequence admittance of all phases of the power distribution network system is calculated; under the condition that each phase of the power distribution network system is in single-phase grounding, a target phase in which the single-phase grounding occurs is determined, target phase voltage, target phase lagging phase voltage, target phase leading phase voltage and internal resistance of a controllable voltage source are detected, and compensation voltage of the controllable voltage source is calculated so as to perform voltage compensation on the power distribution network system in which the single-phase grounding occurs. Therefore, the method and the device provided by the invention fully consider the condition of unbalanced voltage of the power distribution network system and can accurately perform effective voltage compensation on the power distribution network system.
Description
Technical Field
The application relates to the field of single-phase grounding compensation of a power grid system, in particular to a voltage compensation method and device of a controllable voltage source.
Background
In a power distribution network system, single-phase earth faults account for the absolute majority of the total number of faults. In order to extinguish the grounding electric arc, inhibit arc grounding overvoltage, ensure the personal safety while ensuring the power supply reliability, and develop the single-phase grounding active compensation mode of the power distribution network. When the active compensation is performed on the power distribution network system, the compensation voltage needs to be determined in advance.
However, in the actual operation process, the voltage of the power distribution network system is easily unbalanced, and the unbalanced voltage phenomenon causes that the current voltage of the power distribution network system cannot be accurately determined, so that the accurate calculation of the compensation voltage is difficult, and the compensation voltage calculated according to the balanced power network has a large error and is poor in compensation effect.
Disclosure of Invention
The application provides a voltage compensation method and device of a controllable voltage source, and aims to solve the problem that when the voltage compensation is carried out on a power distribution network system by the existing method, the compensation effect is poor.
In a first aspect, the present application provides a voltage compensation method for a controllable voltage source, which is applied to a power distribution network system, where the controllable voltage source is connected between the power distribution network system and ground, and the method includes the following steps:
detecting the voltage of a first phase of the power distribution network system under the condition that the power distribution network system normally operates;
under the condition that the controllable voltage source outputs a first detection voltage, detecting a first current and a second phase voltage output by the controllable voltage source;
under the condition that the controllable voltage source outputs a second detection voltage, detecting a second current and a third each-phase voltage output by the controllable voltage source;
calculating the zero sequence admittance of each phase of the power distribution network system according to the first phase voltage, the second phase voltage, the third phase voltage, the first current and the second current;
under the condition that each phase of the power distribution network system is subjected to single-phase grounding, determining a target phase subjected to single-phase grounding, and detecting target phase voltage, target phase lagging phase voltage, target phase leading phase voltage and internal resistance of a controllable voltage source;
calculating the compensation voltage of the controllable voltage source according to the zero sequence admittance of each phase of the power distribution network system, the target phase voltage, the target phase lagging phase voltage, the target phase leading phase voltage and the internal resistance of the controllable voltage source;
and according to the compensation voltage of the controllable voltage source, performing voltage compensation on the power distribution network system with the single-phase grounding condition.
Optionally, calculating each phase zero-sequence admittance of the power distribution network system according to the following formula, based on the first phase voltage, the second phase voltage, the third phase voltage, the first current and the second current:
in the formula，G A 、G B 、G C Three-phase zero sequence admittance of the power distribution network system is respectively; u shape pa1 、U pb1 、U pc1 Is the first phase voltage; u shape pa2 、U pb2 、U pc2 Is the second phase voltage; u shape pa3 、U pb3 、U pc3 Is the third phase voltage; i is t1 A first current, I, output for the controllable voltage source t2 A second current output by the controllable voltage source.
Optionally, the compensation voltage of the controllable voltage source is calculated according to the zero sequence admittance of each phase of the power distribution network system, the target phase voltage, the target phase lagging phase voltage, the target phase leading phase voltage and the internal resistance of the controllable voltage source according to the following formula:
in the formula of U com Compensating voltage of the controllable voltage source when single-phase grounding occurs to the target phase; u shape jdn Phase voltage after target phase lag; u shape jd Is the target phase voltage; g jdn Corresponding zero sequence admittance after the target phase lag; u shape jdp The target phase is the leading phase voltage; g jdp Advancing the corresponding zero sequence admittance for the target phase; z 0 Is the internal resistance of the controllable voltage source.
Optionally, the frequency of the first detection voltage and the second detection voltage output by the controllable voltage source is the frequency of the power distribution network system, and the voltage amplitudes of the first detection voltage and the second detection voltage are 1% -5% of the nominal voltage of the power distribution network system; the first current and the second current output by the controllable voltage source are currents which are directed to a neutral point of the power distribution network system from the controllable voltage source.
Optionally, the compensation voltage of the controllable voltage source when the target phase is single-phase grounded is a voltage directed from a neutral point of the power distribution network system to the ground.
In a second aspect, the present application further provides a voltage compensation device for a controllable voltage source, which is applied to a power distribution network system, wherein the controllable voltage source is connected between the power distribution network system and ground, and the device includes:
the first detection module is used for detecting the first phase voltage of the power distribution network system under the condition that the power distribution network system normally operates;
the second detection module is used for detecting the first current and the second phase voltage output by the controllable voltage source under the condition that the controllable voltage source outputs the first detection voltage;
the third detection module is used for detecting a second current and a third phase voltage output by the controllable voltage source under the condition that the controllable voltage source outputs a second detection voltage;
the zero sequence admittance calculation module is used for calculating the zero sequence admittance of each phase of the power distribution network system according to the first phase voltage, the second phase voltage, the third phase voltage, the first current and the second current;
the fourth detection module is used for determining a target phase with single-phase grounding under the condition that each phase of the power distribution network system is subjected to single-phase grounding, and detecting target phase voltage, target phase lagging phase voltage, target phase leading phase voltage and internal resistance of a controllable voltage source;
the compensation voltage calculation module is used for calculating the compensation voltage of the controllable voltage source according to the zero sequence admittance of each phase of the power distribution network system, the target phase voltage, the target phase lagging phase voltage, the target phase leading phase voltage and the internal resistance of the controllable voltage source;
and the voltage compensation module is used for performing voltage compensation on the power distribution network system in the single-phase grounding condition according to the compensation voltage of the controllable voltage source.
Optionally, the zero sequence admittance calculating module includes:
in the formula, G A 、G B 、G C Three-phase zero sequence admittance of the power distribution network system is respectively; u shape pa1 、U pb1 、U pc1 Is the first phase voltage; u shape pa2 、U pb2 、U pc2 Is the second phase voltage; u shape pa3 、U pb3 、U pc3 Is the voltage of the third phase; i is t1 A first current, I, output for the controllable voltage source t2 A second current output by the controllable voltage source.
Optionally, the compensation voltage calculating module includes:
in the formula of U com Compensating voltage of the controllable voltage source when single-phase grounding occurs to the target phase; u shape jdn Phase voltage after target phase lag; u shape jd Is the target phase voltage; g jdn Corresponding zero sequence admittance after the target phase lag; u shape jdp The target phase is a leading phase voltage; g jdp Advancing the corresponding zero sequence admittance for the target phase; z is a linear or branched member 0 Is the internal resistance of the controllable voltage source.
Optionally, the frequency of the first detection voltage and the second detection voltage output by the controllable voltage source is the frequency of the power distribution network system, and the voltage amplitudes of the first detection voltage and the second detection voltage are 1% -5% of the nominal voltage of the power distribution network system; the first current and the second current output by the controllable voltage source are currents which are directed to a neutral point of the power distribution network system from the controllable voltage source.
Optionally, the compensation voltage of the controllable voltage source when the target phase is single-phase grounded is a voltage directed from a neutral point of the power distribution network system to the ground.
According to the technical scheme, when the power distribution network system normally operates, the voltage compensation method and the voltage compensation device for the controllable voltage source provided by the embodiment of the invention have the advantages that the first phase voltage, the second phase voltage and the third phase voltage of the power distribution network system are obtained, the first current corresponding to the controllable voltage source when the controllable voltage source outputs the first detection voltage is output, the second current corresponding to the controllable voltage source when the controllable voltage source outputs the second detection voltage is output, and the zero sequence admittance of each phase of the power distribution network system is calculated; under the condition that each phase of the power distribution network system is in single-phase grounding, a target phase in which the single-phase grounding occurs is determined, target phase voltage, target phase lagging phase voltage, target phase leading phase voltage and internal resistance of a controllable voltage source are detected, and compensation voltage of the controllable voltage source is calculated so as to perform voltage compensation on the power distribution network system in which the single-phase grounding occurs. Therefore, the method and the device provided by the invention fully consider the condition of the voltage unbalance of the power distribution network system, and can accurately determine the voltage which is required to be output by the controllable voltage source to completely compensate the grounding current when the power distribution network system is in single-phase grounding, so as to effectively compensate the voltage of the power distribution network system.
Drawings
In order to more clearly describe the technical solution of the present application, the drawings required to be used in the embodiments will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a flowchart of a voltage compensation method for a controllable voltage source according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a voltage compensation system of a controllable voltage source according to an embodiment of the present invention;
fig. 3 is a block diagram of a voltage compensation apparatus for a controllable voltage source according to an embodiment of the present invention.
Detailed Description
Fig. 1 is a flowchart of a voltage compensation method for a controllable voltage source according to an embodiment of the present invention; fig. 2 is a schematic structural diagram of a voltage compensation system of a controllable voltage source according to an embodiment of the present invention.
Referring to fig. 1, a voltage compensation method for a controllable voltage source according to an embodiment of the present invention is applied to a power distribution network system, and the controllable voltage source is connected between the power distribution network system and ground. The distribution network system, the controllable voltage source and the distributed impedance form a voltage compensation system, as shown in fig. 2, the controllable voltage source 2 is connected with a bus of the distribution network system through a grounding transformer 1, and the distributed impedance 3 is connected with the bus of the distribution network system. The voltage compensation method is used for calculating the compensation voltage of the controllable voltage source based on the voltage unbalance phenomenon existing in the power distribution network system when the power distribution network system is in single-phase grounding, and performing voltage compensation on the power distribution network system to enable the power distribution network system to restore balance.
Specifically, the voltage compensation method for the controllable voltage source provided by the embodiment of the present invention includes the following steps:
s1, detecting first phase voltage of a power distribution network system under the condition that the power distribution network system normally operates;
when the single-phase grounding phenomenon does not occur in the power distribution network system, the phase voltages of the A phase, the B phase and the C phase in the power distribution network system are determined, and are compared with the corresponding phase voltages when the single-phase grounding phenomenon occurs, so that the compensation voltage needing to be input is accurately determined.
S2, detecting a first current and a second each-phase voltage output by the controllable voltage source under the condition that the controllable voltage source outputs a first detection voltage;
s3, detecting a second current and a third phase voltage output by the controllable voltage source under the condition that the controllable voltage source outputs a second detection voltage;
when the power distribution network system normally operates, the controllable voltage source normally outputs a voltage value, and two time points when the controllable voltage source outputs the voltage are selected as references to determine the output voltage change of the controllable voltage source so as to ensure the accuracy of the subsequent calculation of each phase zero sequence admittance.
When the controllable voltage source outputs the first detection voltage at the first time point, the first current output by the corresponding controllable voltage source and the second phase voltage of the power distribution grid system at the first time point, namely the phase voltages of the A, B and C phases in the power distribution grid system corresponding to the first time point, can be obtained at the same time.
And at a second time point, when the controllable voltage source outputs a second detection voltage, a second current output by the corresponding controllable voltage source and a third phase voltage of the power distribution network system at the second time point, namely phase voltages of the three phases A, B and C in the power distribution network system corresponding to the second time point, can be obtained at the same time.
The frequency of the controllable voltage source outputting the first detection voltage and the second detection voltage is the frequency of the power distribution network system, and the voltage amplitudes of the first detection voltage and the second detection voltage are respectively 1% -5% of the nominal voltage of the power distribution network system; the first current and the second current output by the controllable voltage source are currents which are directed to a neutral point of the power distribution network system from the controllable voltage source.
When the target phase is earthed in a single phase, the compensation voltage of the controllable voltage source is directed to the ground from the neutral point of the power distribution network system, and the output direction of the compensation voltage is directed to the ground from the neutral point of the power distribution network system.
S4, calculating zero sequence admittance of each phase of the power distribution network system according to the first phase voltage, the second phase voltage, the third phase voltage, the first current and the second current;
when the power distribution network system normally operates, the detuning of the arc elimination coil in the power distribution network system and the phase change of the displacement voltage are utilized to calculate the ground admittance of each line in the power distribution network system in real time, so that each phase zero sequence admittance is used as a reference value of the corresponding line in the normal operation of the power distribution network system, and the voltage needing to be compensated can be accurately calculated when a certain line is grounded in a single phase.
Specifically, in this embodiment, the zero sequence admittance of each phase of the power distribution network system is calculated according to the following formula:
in the formula, G A 、G B 、G C Respectively three-phase zero sequence admittance of the power distribution network system; u shape pa1 、U pb1 、U pc1 Is the first phase voltage; u shape pa2 、U pb2 、U pc2 Is the second phase voltage; u shape pa3 、U pb3 、U pc3 Is the third phase voltage; i is t1 A first current, I, output for the controllable voltage source t2 A second current output by the controllable voltage source.
In normal operation of the distribution network system, G A For A-phase zero-sequence admittance, G, of power distribution network systems B For B-phase zero-sequence admittance, G, of power distribution network system C A C-phase zero-sequence admittance of the power distribution network system; u shape pa1 Is a first A-phase voltage, U pb1 Is the first B-phase voltage，U pc1 Is a first C-phase voltage; u shape pa2 Is a second A-phase voltage, U pb2 Is the second B-phase voltage, U pc2 Is a second C-phase voltage; u shape pa3 Is a third A-phase voltage, U pb3 Is a third B-phase voltage, U pc3 Is the third C-phase voltage.
S5, under the condition that each phase of the power distribution network system is in single-phase grounding, determining a target phase in which the single-phase grounding occurs, and detecting target phase voltage, target phase lagging phase voltage, target phase leading phase voltage and internal resistance of a controllable voltage source;
in the actual operation process of the power distribution network system, a single-phase grounding condition is easy to occur, and under the condition that each phase of the power distribution network system is subjected to single-phase grounding, three-phase voltage of the single-phase grounding at the current moment needs to be detected in real time so as to determine a target phase of the single-phase grounding.
Meanwhile, the target phase voltage, the target phase lagging phase voltage, the target phase leading phase voltage and the internal resistance of the controllable voltage source in the power distribution network system are determined, so that the influence of voltage unbalance phenomena occurring in the power distribution network system on each phase voltage is avoided, and further the compensation voltage which is required to be output by the controllable voltage source to completely compensate grounding current when the target phase of the power distribution network system is in single-phase grounding can be accurately determined.
S6, calculating the compensation voltage of the controllable voltage source according to the zero sequence admittance of each phase of the power distribution network system, the target phase voltage, the target phase lagging phase voltage, the target phase leading phase voltage and the internal resistance of the controllable voltage source;
the compensation voltage of the controllable voltage source is the voltage which should be output by the controllable voltage source to completely compensate the grounding current when the target phase of the power distribution network system is grounded in a single phase.
When the compensation voltage is calculated, the voltage unbalance phenomenon existing in the power distribution network system is fully considered, the condition that the compensation voltage error calculated according to the balanced power grid is large is avoided, and the compensation effect is further improved.
Specifically, in this embodiment, the compensation voltage of the controllable voltage source is calculated according to the following formula:
in the formula of U com Compensating voltage of a controllable voltage source when single-phase grounding occurs to a target phase; u shape jdn Phase voltage after target phase lag; u shape jd Is the target phase voltage; g jdn The corresponding zero sequence admittance is obtained after the phase lag of the target; u shape jdp The target phase is the leading phase voltage; g jdp Zero sequence admittance corresponding to the target phase advance; z is a linear or branched member 0 Is the internal resistance of the controllable voltage source.
The zero sequence admittance corresponding to the lag of the target phase and the zero sequence admittance corresponding to the lead of the target phase can be determined after the target phase is determined. For example, if the target phase is phase a, the target phase lag phase is phase B, and the target phase lead phase is phase C, then the target phase lag corresponds to the zero sequence admittance G jdn Is G B Zero sequence admittance G corresponding to target phase lead jdp Is G C 。
And S7, performing voltage compensation on the power distribution network system with the single-phase grounding condition according to the compensation voltage of the controllable voltage source.
When the target phase of the power distribution network system is subjected to single-phase grounding, the voltage which is required to be output by grounding current is completely compensated by the controllable voltage source, and then the voltage compensation can be carried out on the power distribution network system which is subjected to the single-phase grounding condition according to the compensation voltage of the controllable voltage source.
According to the technical scheme, when the power distribution network system operates normally, the voltage compensation method for the controllable voltage source obtains the first phase voltage, the second phase voltage and the third phase voltage of the power distribution network system, obtains the first current corresponding to the controllable voltage source when outputting the first detection voltage, obtains the second current corresponding to the controllable voltage source when outputting the second detection voltage, and calculates the zero sequence admittance of each phase of the power distribution network system; under the condition that each phase of the power distribution network system is in single-phase grounding, a target phase in which the single-phase grounding occurs is determined, target phase voltage, target phase lagging phase voltage, target phase leading phase voltage and internal resistance of a controllable voltage source are detected, and compensation voltage of the controllable voltage source is calculated so as to perform voltage compensation on the power distribution network system in which the single-phase grounding occurs. Therefore, the method provided by the invention can be used for accurately determining the voltage which is required to be output by the controllable voltage source to completely compensate the grounding current when the power distribution network system is grounded in a single phase by fully considering the condition of unbalanced voltage of the power distribution network system so as to effectively compensate the voltage of the power distribution network system.
As shown in fig. 3, a voltage compensation apparatus for a controllable voltage source according to an embodiment of the present invention is applied to a power distribution network system, the controllable voltage source is connected between the power distribution network system and ground, and is used for performing the relevant steps of the voltage compensation method for the controllable voltage source shown in fig. 1, and the apparatus includes:
the first detection module 10 is used for detecting the first phase voltage of the power distribution network system under the condition that the power distribution network system normally operates;
the second detection module 20 is configured to detect a first current and a second individual-phase voltage output by the controllable voltage source when the controllable voltage source outputs a first detection voltage;
a third detecting module 30, configured to detect a second current and a third phase voltage output by the controllable voltage source when the controllable voltage source outputs a second detected voltage;
the zero sequence admittance calculating module 40 is configured to calculate zero sequence admittances of the phases of the power distribution network system according to the first, second, third, first and second phase voltages;
the fourth detection module 50 is configured to determine a target phase in which single-phase grounding occurs when each phase of the power distribution grid system is in single-phase grounding, and detect a target phase voltage, a target phase lagging phase voltage, a target phase leading phase voltage, and an internal resistance of the controllable voltage source;
the compensation voltage calculation module 60 is configured to calculate a compensation voltage of the controllable voltage source according to the zero sequence admittance of each phase of the power distribution network system, the target phase voltage, the target phase lagging phase voltage, the target phase leading phase voltage, and the internal resistance of the controllable voltage source;
and the voltage compensation module 70 is configured to perform voltage compensation on the power distribution network system with the single-phase grounding condition according to the compensation voltage of the controllable voltage source.
Optionally, the zero sequence admittance calculating module 40 includes:
in the formula, G A 、G B 、G C Respectively three-phase zero sequence admittance of the power distribution network system; u shape pa1 、U pb1 、U pc1 Is the first phase voltage; u shape pa2 、U pb2 、U pc2 Is the second phase voltage; u shape pa3 、U pb3 、U pc3 Is the third phase voltage; I.C. A t1 A first current, I, output by a controllable voltage source t2 A second current output by the controllable voltage source.
Optionally, the compensation voltage calculating module 60 includes:
in the formula of U com Compensating voltage of a controllable voltage source when single-phase grounding occurs to a target phase; u shape jdn Phase voltage after target phase lag; u shape jd Is the target phase voltage; g jdn The corresponding zero sequence admittance is obtained after the phase lag of the target; u shape jdp The target phase is the leading phase voltage; g jdp Advancing the corresponding zero sequence admittance for the target phase; z 0 Is the internal resistance of the controllable voltage source.
Optionally, the frequency of the first detection voltage and the second detection voltage output by the controllable voltage source is the frequency of the power distribution network system, and the voltage amplitudes of the first detection voltage and the second detection voltage are 1% -5% of the nominal voltage of the power distribution network system; the first current and the second current output by the controllable voltage source are currents which are directed to a neutral point of the power distribution network system from the controllable voltage source.
Optionally, the compensation voltage of the controllable voltage source when the target phase is single-phase grounded is a voltage directed from a neutral point of the power distribution network system to the ground.
The same and similar parts among the various embodiments in this specification may be referred to each other. In particular, for the embodiment of the voltage compensation device of the controllable voltage source, since it is substantially similar to the embodiment of the method, the description is simple, and the relevant points can be referred to the description of the embodiment of the method.
The above-described embodiments of the present invention do not limit the scope of the present invention.
Claims (8)
1. A voltage compensation method of a controllable voltage source is applied to a power distribution network system, the controllable voltage source is connected between the power distribution network system and the ground, and the method is characterized by comprising the following steps:
under the condition that a power distribution network system normally operates, detecting first each-phase voltage of the power distribution network system;
under the condition that the controllable voltage source outputs a first detection voltage, detecting a first current and a second phase voltage output by the controllable voltage source;
under the condition that the controllable voltage source outputs a second detection voltage, detecting a second current and a third phase voltage output by the controllable voltage source;
creating a first matrix according to the first phase voltage, the second phase voltage and the third phase voltage, creating a second matrix according to the first current and the second current, and calculating the product of the inverse matrix of the first matrix and the second matrix to obtain the zero sequence admittance of each phase of the power distribution network system;
under the condition that each phase of the power distribution network system is in single-phase grounding, determining a target phase in which the single-phase grounding occurs, and detecting target phase voltage, target phase lagging phase voltage, target phase leading phase voltage and internal resistance of a controllable voltage source;
according to the zero sequence admittance and the target phase voltage U of each phase of the power distribution network system jd Target phase lag phase voltage U jdn Target phase leading phase voltage U jdp And the internal resistance Z of the controllable voltage source 0 According to formula
Calculating the compensation voltage U of a controllable voltage source com (ii) a In the formula, G jdn Zero sequence admittance, G, for target phase lag correspondences jdp Advancing the corresponding zero sequence admittance for the target phase;
and according to the compensation voltage of the controllable voltage source, performing voltage compensation on the power distribution network system with the single-phase grounding condition.
2. The method of claim 1, wherein the zero sequence admittance of the phases of the power distribution system is calculated from the first phase voltage, the second phase voltage, the third phase voltage, the first current, and the second current according to the following equation:
in the formula, G A 、G B 、G C Respectively three-phase zero sequence admittance of the power distribution network system; u shape pa1 、U pb1 、U pc1 Is the first phase voltage; u shape pa2 、U pb2 、U pc2 Is the second phase voltage; u shape pa3 、U pb3 、U pc3 Is the voltage of the third phase; i is t1 A first current, I, output by a controllable voltage source t2 A second current output by the controllable voltage source.
3. The method according to claim 1, wherein the frequency of the first detection voltage and the second detection voltage outputted by the controllable voltage source is the frequency of the power distribution system, and the voltage amplitude of the first detection voltage and the second detection voltage is 1% -5% of the nominal voltage of the power distribution system; the first current and the second current output by the controllable voltage source are currents which are directed to a neutral point of the power distribution network system from the controllable voltage source.
4. The method of claim 1, wherein the compensation voltage of the controllable voltage source when the target phase is single-phase grounded is a voltage directed from a neutral point of the power distribution network system to ground.
5. A voltage compensation device of a controllable voltage source is applied to a power distribution network system, the controllable voltage source is connected between the power distribution network system and the ground, and the voltage compensation device is characterized by comprising:
the first detection module is used for detecting the first phase voltage of the power distribution network system under the condition that the power distribution network system normally operates;
the second detection module is used for detecting the first current and the second phase voltage output by the controllable voltage source under the condition that the controllable voltage source outputs the first detection voltage;
the third detection module is used for detecting a second current and a third phase voltage output by the controllable voltage source under the condition that the controllable voltage source outputs a second detection voltage;
the zero sequence admittance calculation module is used for creating a first matrix according to the first phase voltage, the second phase voltage and the third phase voltage, creating a second matrix according to the first current and the second current, and calculating the product of the inverse matrix of the first matrix and the second matrix to obtain the zero sequence admittance of each phase of the power distribution network system;
the fourth detection module is used for determining a target phase with single-phase grounding under the condition that each phase of the power distribution network system is subjected to single-phase grounding, and detecting target phase voltage, target phase lagging phase voltage, target phase leading phase voltage and internal resistance of a controllable voltage source;
a compensation voltage calculation module for calculating the zero sequence admittance and target phase voltage U of each phase of the power distribution network system jd Target phase lag phase voltage U jdn Target phase leading phase voltage U jdp And the internal resistance Z of the controllable voltage source 0 According to formula
Calculating the compensation voltage U of a controllable voltage source com (ii) a In the formula, G jdn Zero sequence admittance, G, for target phase lag correspondences jdp Zero sequence admittance corresponding to the target phase advance;
and the voltage compensation module is used for performing voltage compensation on the power distribution network system with the single-phase grounding condition according to the compensation voltage of the controllable voltage source.
6. The apparatus of claim 5, wherein the zero sequence admittance calculation module comprises:
in the formula, G A 、G B 、G C Three-phase zero sequence admittance of the power distribution network system is respectively; u shape pa1 、U pb1 、U pc1 Is the first phase voltage; u shape pa2 、U pb2 、U pc2 Is the voltage of the second phase; u shape pa3 、U pb3 、U pc3 Is the voltage of the third phase; i is t1 A first current, I, output by a controllable voltage source t2 A second current output by the controllable voltage source.
7. The device of claim 5, wherein the frequency of the first and second detected voltages outputted by the controllable voltage source is the frequency of the power distribution system, and the voltage amplitudes of the first and second detected voltages are 1% -5% of the nominal voltage of the power distribution system; the first current and the second current output by the controllable voltage source are currents which are directed to a neutral point of the power distribution network system from the controllable voltage source.
8. The apparatus of claim 5, wherein the compensation voltage of the controllable voltage source when the target phase is single-phase grounded is a voltage directed from a neutral point of the power distribution network system to ground.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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