CN115764824A - Power distribution network current protection setting method considering inverter power supply control strategy - Google Patents
Power distribution network current protection setting method considering inverter power supply control strategy Download PDFInfo
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Abstract
The invention relates to a power distribution network current protection setting method considering an inverter power supply control strategy, which comprises the following steps of: determining a fault type; determining an IIDG control strategy; determining a low voltage ride through control strategy according to the fault type and the IIDG control strategy; calculating the voltage of an IIDG access point when a line at the tail end of the protection is in fault according to the topological structure parameters of the power distribution network, determining the operating point of the IIDG, and obtaining the output maximum current of the IIDG when the line is in fault; and determining a protection installation position, and setting according to the protection installation position. In the setting calculation process, the control strategy of the inverter power supply in the actual engineering is fully considered, the inverter power supply is divided into a following network type and a network construction type, and the fault ride-through strategies of the inverter power supply in the fault period are different according to different control strategies, so that the calculation methods for providing the fault current are also different.
Description
Technical Field
The invention relates to a power distribution network current protection setting method considering an inverter power supply control strategy, and belongs to the technical field of power distribution network relay protection.
Background
With the gradual exhaustion of traditional fossil energy, the electric power industry of various countries has begun looking to a clean, efficient and flexible way of generating electricity, distributed Generation (DG). However, a large-scale new energy Inverter Distributed Generation (IIDG) is connected to the power distribution network, so that the fault characteristics of the conventional power distribution network are changed. Meanwhile, the output characteristic of the inverter type distributed power supply is more complex than that of the traditional power supply, and the output current is determined by the control strategy of the controller. In the traditional three-stage current protection setting calculation, the size of the short-circuit current is inversely proportional to the length of the line, and a method for avoiding the maximum short-circuit current at the tail end of the line is used. However, in the distribution line containing the IIDG, because the short-circuit current is not inversely proportional to the length of the line due to the presence of the IIDG, the short-circuit current is related to the input power of the IIDG and the position of the short-circuit point, and is in a nonlinear relationship, the traditional current protection is easy to malfunction and refuse after the IIDG is connected to the distribution network. After the inverter power supply is connected, the main protection of the power distribution network is still configured and set according to the original configuration and setting method, so that when a fault occurs, the main protection of the power distribution network can be mistakenly operated and refused, all loads on the whole main circuit are powered off under severe conditions, and the power failure range is expanded. Most of the prior art are directed to a network-following type inverter power supply based on phase-locked loop control, and cannot be applied to a network-forming type control strategy.
Disclosure of Invention
In order to overcome the problems, the invention provides a power distribution network current protection setting method considering an inverter power supply control strategy, the method fully considers the control strategy of the inverter power supply in practical engineering in the setting calculation process, the inverter power supply is divided into a network following type and a network construction type, and the inverter power supply with different control strategies has different fault ride-through strategies in the fault period, so that the calculation methods for providing fault current are also different.
The technical scheme of the invention is as follows:
a power distribution network current protection setting method considering an inverter power supply control strategy comprises the following steps:
determining a fault type;
determining an IIDG control strategy;
determining a traversing control strategy according to the fault type and the IIDG control strategy;
calculating the voltage of an IIDG access point when a line at the tail end of the protection is in fault according to the topological structure parameters of the power distribution network, determining the operating point of the IIDG, and obtaining the output maximum current of the IIDG when the line is in fault;
and determining a protection installation position, and setting according to the protection installation position.
Further, the fault types include a three-phase short-circuit fault and a two-phase short-circuit fault.
Further, the IIDG control strategy includes a network-following type IIDG and a network-forming type IIDG, where the network-following type IIDG includes a dual-ring control network-following type IIDG and a non-dual-ring control network-following type IIDG, and the network-forming type IIDG includes a dual-ring control network-forming type IIDG and a non-dual-ring control network-forming type IIDG.
Further, when the fault type is a three-phase short-circuit fault, according to a low voltage ride through control strategy of an IIDG with a dual-ring control grid-following type, the IIDG has the output fault current characteristics that:
wherein, I IIDG-3 Fault current, I, output by IIDG in case of three-phase short-circuit fault d Is d-axis current of IIDG under dq rotation coordinate system, I q For the q-axis current of the IIDG under the dq rotation coordinate system, the IIDG outputs the fault current K under the rotation coordinate system 1 、K 2 Is the voltage support coefficient, I max Maximum current, V, supplied to the inverter s Per unit value, V, representing the voltage at the IIDG access point PCC Is the voltage of the IIDG access point.
Further, when the fault type is a three-phase short-circuit fault, the low voltage ride through control strategy of the IIDG with the dual-ring control network structure is as follows:
the method is characterized in that the self characteristic of the double-loop control network type IIDG is utilized to provide reactive power for the system, current limiting control is adopted, current saturation is switched to vector current control for current limiting when a fault occurs, and the logic of a limiting link and exit is as follows:
wherein, I d,ref 、I q,ref D-axis and q-axis current reference values output by the voltage inner ring in double-ring control respectively;
d-axis and q-axis current reference values I output by the current amplitude limiting link respectively max The maximum current provided by the inverter.
Further, when the fault type is a three-phase short-circuit fault, because the network-forming type IIDG can provide support for the power grid by using its own reactive-droop characteristic, the fault ride-through control strategy of the non-double-loop control network-forming type IIDG is as follows:
limiting the output current of the IIDG by adding a virtual impedance and adjusting the output voltage of the inverter, wherein the virtual impedance does not play a role in a steady state;
at the moment, the inverter supplies the maximum current I max Comprises the following steps:
wherein, E f To output a voltage command value, V PCC Voltage of IIDG access point, [ theta ] vsg And theta f The phase of the output voltage of the IIDG and the phase of the voltage at the IIDG access point are respectively shown, R and L are respectively a resistor and an inductor which are accessed to a power transmission line of a power distribution network, and gamma and omega are respectively an impedance angle and angular frequency.
Further, when the fault type is a two-phase short-circuit fault, the low voltage ride through control strategy of the network type IIDG is as follows:
the positive and negative sequence independent control is adopted to eliminate the second harmonic, and the output characteristic of the net-following type IIDG fault current after the positive and negative sequence independent control is as follows:
wherein, I IIDG-3 Fault current, I, output by IIDG for two-phase short-circuit fault q + 、I d + D and q axis output current positive sequence components, K, of IIDG 1 、K 2 Is the voltage support coefficient, I max Maximum current, I, allowed to be supplied by the inverter N For IIDG outputRated current, V PCC+ Positive sequence voltage, V, for IIDG access point s+ Represents the per unit value of the positive sequence voltage of the IIDG access point.
Further, when the fault type is a two-phase short circuit fault, the low voltage ride through control strategy of the dual-loop-free control network type IIDG further includes:
taking an AB two-phase short circuit fault as an example, the unbalanced fault current is eliminated by throwing virtual impedance and changing a fault instruction set in the fault phase, specifically:
I max ＝max{I max-a ，I max-b }；
wherein, I max Maximum current, I, supplied to the inverter max-a 、I max-b Respectively representing the a-phase maximum current and the b-phase maximum current, E, supplied by IIDG fa 、E fb Respectively representing phase a and phase b output voltages, V, of IIDG PCCa And V PCCb A-phase voltage and b-phase voltage of a grid connection point, theta vsga And theta vsgb Initial phase, θ, of phase a and phase b of the IIDG output voltage, respectively fa And theta fb The initial phases of the voltage of the phase a and the phase b at the IIDG access point are respectively, R and L are respectively a resistor and an inductor which are accessed to a power transmission line of a power distribution network, and gamma and omega are respectively an impedance angle and angular frequency.
Further, the determining of the protection installation position and the setting according to the protection installation position specifically include:
s1, judging whether a protection position is installed at the upstream of an IIDG, if so, executing a step S2, and otherwise, executing a step S3;
s2, judging whether the protection is I-section protection, if so, performing setting calculation on the current protection without considering the influence of the IIDG, and finishing the setting, otherwise, executing the step S4;
s3, determining a protection setting type, wherein the protection setting type comprises a section I protection and a section II protection, and if the protection setting type is the section I protection, executing the step S5;
s4, setting according to the following formula:
wherein, I act-II 、I act-I For respectively protecting setting value and K of section II and section I rel-II Reliability factor, K, for segment II protection b Is the branching coefficient;
branch coefficient K in three-phase short-circuit fault b-3 Comprises the following steps:
wherein E is the power supply voltage of the distribution network, Z is the impedance of the power supply, Z AB Is the impedance of line AB, which is the line upstream of the IIDG access point, Z BC Is the impedance of line BC, which is the downstream line of IIDG access point, V PCC A voltage of the IIDG access point;
branching coefficient K at two-phase short-circuit fault b-2 Comprises the following steps:
wherein, I IIDG-A Is a positive sequence component, V, of the a-phase output current of IIDG PCCa+ A phase positive sequence voltage, Z, for IIDG access point AB+ And Z AB- Positive and negative sequence impedances, Z, respectively, of the line AB BC+ And Z BC- Positive and negative sequence impedances, Z, respectively, of the line BC + Is the positive sequence impedance of the power supply;
s5, setting according to the following formula:
wherein, K rel-I To protect the reliability factor of the I section.
The invention has the following beneficial effects:
the control strategy of the inverter power supply in the actual engineering is fully considered in the setting calculation process, the inverter power supply is divided into a following network type and a network construction type, and the fault ride-through strategies of the inverter power supply during the fault period are different according to different control strategies, so that the calculation method for providing the fault current is different, and compared with the prior art, the method is applicable to the network construction type IIDG and is beneficial to the engineering realization.
Drawings
FIG. 1 is a process flow of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
Referring to fig. 1, a method for setting power distribution network current protection considering an inverter power control strategy includes the following steps:
determining a fault type;
determining an IIDG control strategy;
determining a traversing control strategy according to the fault type and the IIDG control strategy;
calculating the voltage of an IIDG access point when a line at the tail end of the protection is in fault according to the topological structure parameters of the power distribution network, determining the operating point of the IIDG, and obtaining the output maximum current of the IIDG when the line is in fault;
and determining a protection installation position, and setting according to the protection installation position.
In a specific embodiment of the present invention, the fault types include a three-phase short-circuit fault and a two-phase short-circuit fault.
In a specific embodiment of the present invention, the IIDG control strategy includes a network-follower type IIDG and a network-configuration type IIDG, where the network-follower type IIDG includes a dual-ring control network-follower type IIDG and a dual-ring-free control network-follower type IIDG, and the network-configuration type IIDG includes a dual-ring control network-configuration type IIDG and a dual-ring-free control network-configuration type IIDG.
In an embodiment of the present invention, when the fault type is a three-phase short-circuit fault, according to a low voltage ride through control strategy of an IIDG with dual-ring control and grid-following type, the IIDG has output fault current characteristics as follows:
wherein, I IIDG-3 Fault current, I, output by IIDG for three-phase short-circuit fault d Is d-axis current, I, of IIDG in dq rotation coordinate system q For the q-axis current of the IIDG under the dq rotation coordinate system, the IIDG outputs the fault current K under the rotation coordinate system 1 、K 2 Is the voltage support coefficient, I max Maximum current, V, supplied to the inverter s Per unit value, V, representing the voltage at the IIDG access point PCC Is the voltage of the IIDG access point.
In an embodiment of the present invention, when the fault type is a three-phase short-circuit fault, the low voltage ride through control strategy of the dual-ring control network type IIDG is as follows:
the method is characterized in that the self characteristic of the double-loop control network type IIDG is utilized to provide reactive power for the system, current limiting control is adopted, current saturation is switched to vector current control for current limiting when a fault occurs, and the logic of a limiting link and exit is as follows:
wherein, I d,ref 、I q,ref D-axis and q-axis current reference values respectively output by the voltage inner ring in double-ring control；
D-axis and q-axis current reference values I output by the current limiting link respectively max The maximum current provided by the inverter.
In an embodiment of the present invention, when the fault type is a three-phase short-circuit fault, since the network configuration type IIDG may provide a support for the power grid by using its own reactive-droop characteristic, the fault ride-through control strategy of the non-dual-ring control network configuration type IIDG is as follows:
limiting the output current of the IIDG by adding a virtual impedance and adjusting the output voltage of the inverter, wherein the virtual impedance does not play a role in a steady state;
at the moment, the inverter supplies the maximum current I max Comprises the following steps:
wherein E is f To output a voltage command value, V PCC Voltage of IIDG access point, [ theta ] vsg And theta f The phase positions are respectively the IIDG output voltage phase and the voltage phase at the IIDG access point, R and L are respectively the resistance and the inductance of the power transmission line accessed to the power distribution network, and gamma and omega are respectively an impedance angle and angular frequency.
In an embodiment of the present invention, when the fault type is a two-phase short-circuit fault, the low voltage ride through control strategy of the network type IIDG is as follows:
the positive and negative sequence independent control is adopted to eliminate the second harmonic, and the output characteristic of the net-following type IIDG fault current after the positive and negative sequence independent control is as follows:
wherein, I IIDG-3 Fault current, I, output by IIDG for two-phase short-circuit fault q + 、I d + D and q axis output current positive sequence components, K, of IIDG 1 、K 2 Is the voltage support coefficient, I max Maximum current, I, allowed to be supplied by the inverter N Rated current, V, for IIDG output PCC+ Positive sequence voltage, V, for IIDG access point s+ Represents the per unit value of the positive sequence voltage of the IIDG access point.
In an embodiment of the present invention, when the fault type is a two-phase short-circuit fault, the low voltage ride through control strategy of the dual-loop-free control fabric type IIDG further includes:
taking an AB two-phase short circuit fault as an example, the unbalanced fault current is eliminated by throwing virtual impedance and changing a fault instruction set in the fault phase, specifically:
I max ＝max{I max-a ，I max-b }；
wherein, I max Maximum current, I, supplied to the inverter max-a 、I max-b Respectively representing the a-phase maximum current and the b-phase maximum current, E, supplied by IIDG fa 、E fb Respectively representing phase a and phase b output voltages, V, of IIDG PCCa And V PCCb A-phase voltage and b-phase voltage of grid connection point, theta vsga And theta vsgb Initial phase, θ, of phase a and phase b of the IIDG output voltage, respectively fa And theta fb The initial phase of the voltage of the phase a and the phase b at the IIDG access point are respectively, R and L are respectively a resistor and an inductor which are accessed to a power transmission line of a power distribution network, and gamma and omega are respectively an impedance angle and angular frequency.
In an embodiment of the present invention, the determining the protection installation position and setting according to the protection installation position specifically include:
s1, judging whether a protection position is installed at the upstream of an IIDG, if so, executing a step S2, otherwise, executing a step S3;
s2, judging whether the protection is I-section protection, if so, performing setting calculation on the current protection without considering the influence of the IIDG, and finishing the setting, otherwise, executing the step S4;
s3, determining a protection setting type, wherein the protection setting type comprises a section I protection and a section II protection, and if the protection setting type is the section I protection, executing the step S5;
s4, setting according to the following formula:
wherein, I act-II 、I act-I For respectively protecting setting value and K of section II and section I rel-II Reliability factor, K, for segment II protection b Is the branching coefficient;
branch coefficient K in three-phase short-circuit fault b-3 Comprises the following steps:
wherein E is the power supply voltage of the distribution network, Z is the impedance of the power supply, Z AB Is the impedance of line AB, which is the line upstream of the IIDG access point, Z BC Is the impedance of line BC, which is the downstream line of IIDG access point, V PCC A voltage of the IIDG access point;
branching coefficient K at two-phase short-circuit fault b-2 Comprises the following steps:
wherein, I IIDG-A Is a positive sequence component, V, of the a-phase output current of IIDG PCCa+ A phase positive sequence voltage, Z, for IIDG access point AB+ And Z AB- Positive and negative sequence impedances, Z, respectively, of the line AB BC+ And Z BC- Positive and negative sequence impedances, Z, respectively, of the line BC + Is the positive sequence impedance of the power supply;
s5, setting according to the following formula:
wherein, K rel-I To protect the reliability factor of the I section.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures made by using the contents of the specification and the drawings of the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (9)
1. A power distribution network current protection setting method considering an inverter power supply control strategy is characterized by comprising the following steps:
determining a fault type;
determining an IIDG control strategy;
determining a traversing control strategy according to the fault type and the IIDG control strategy;
calculating the voltage of an IIDG access point when a line at the tail end of the protection is in fault according to the topological structure parameters of the power distribution network, determining the operating point of the IIDG, and obtaining the output maximum current of the IIDG when the line is in fault;
and determining a protection installation position, and setting according to the protection installation position.
2. The method for power distribution network current protection setting considering the inverter power control strategy according to claim 1, wherein the fault types include a three-phase short-circuit fault and a two-phase short-circuit fault.
3. The method for power distribution network current protection setting considering the inverter power control strategy according to claim 2, wherein the IIDG control strategy comprises a network following type IIDG and a network configuration type IIDG, wherein the network following type IIDG comprises a double-ring control network following type IIDG and a double-ring-free control network following type IIDG, and the network configuration type IIDG comprises a double-ring control network configuration type IIDG and a double-ring-free control network configuration type IIDG.
4. The method for protecting and setting the power distribution network current considering the control strategy of the inverter power supply according to claim 3, wherein when the fault type is a three-phase short-circuit fault, according to a low-voltage ride-through control strategy of an IIDG with a double-loop control grid-connected type, the IIDG outputs fault current characteristics as follows:
wherein, I IIDG-3 Fault current, I, output by IIDG for three-phase short-circuit fault d Is d-axis current, I, of IIDG in dq rotation coordinate system q For the q-axis current of the IIDG under the dq rotation coordinate system, the IIDG outputs the fault current K under the rotation coordinate system 1 、K 2 Is the voltage support coefficient, I max Maximum current, V, supplied to the inverter s Per unit value, V, representing the voltage at the IIDG access point PCC Is the voltage of the IIDG access point.
5. The method for power distribution network current protection setting considering the inverter power control strategy of claim 4, wherein when the fault type is a three-phase short-circuit fault, the low voltage ride through control strategy with the double-loop control network type IIDG is as follows:
the method is characterized in that the self characteristic of the IIDG with the double-loop control network structure is utilized to provide reactive power for a system, current limiting control is adopted, current saturation is switched to vector current control to limit current during fault, and the logic of the limiting link and the exiting logic is as follows:
wherein, I d,ref 、I q,ref D-axis and q-axis current reference values output by the voltage inner ring in double-ring control respectively;
d-axis and q-axis current reference values I output by the current amplitude limiting link respectively max The maximum current provided by the inverter.
6. The method for power distribution network current protection setting considering the inverter power control strategy of claim 3, wherein when the fault type is a three-phase short-circuit fault, because the network type IIDG can provide support for the power grid by utilizing the reactive-droop characteristic of the network type IIDG, the fault ride-through control strategy of the non-double-ring control network type IIDG is as follows:
limiting the output current of the IIDG by adding a virtual impedance and adjusting the output voltage of the inverter, wherein the virtual impedance does not play a role in a steady state;
at the moment, the inverter supplies the maximum current I max Comprises the following steps:
wherein E is f To output a voltage command value, V PCC Voltage of IIDG access point, [ theta ] vsg And theta f The phase positions are respectively the IIDG output voltage phase and the voltage phase at the IIDG access point, R and L are respectively the resistance and the inductance of the power transmission line accessed to the power distribution network, and gamma and omega are respectively an impedance angle and angular frequency.
7. The method for power distribution network current protection setting considering the inverter power control strategy of claim 3, wherein when the fault type is a two-phase short-circuit fault, the low voltage ride through control strategy of the network type IIDG is as follows:
the positive and negative sequence independent control is adopted to eliminate the second harmonic, and the output characteristic of the net-following type IIDG fault current after the positive and negative sequence independent control is as follows:
wherein, I IIDG-3 Fault current, I, output by IIDG in case of two-phase short-circuit fault q + 、I d + D and q axis output current positive sequence components, K, of IIDG 1 、K 2 Is the voltage support coefficient, I max Maximum current, I, allowed to be supplied by the inverter N Rated current, V, for IIDG output PCC+ Is the positive sequence voltage of the IIDG access point,
represents the per unit value of the positive sequence voltage of the IIDG access point.
8. The method for power distribution network current protection setting considering the inverter power control strategy of claim 3, wherein when the fault type is a two-phase short-circuit fault, the low voltage ride through control strategy of the double-loop-free control network type IIDG further comprises:
taking an AB two-phase short circuit fault as an example, the unbalanced fault current is eliminated by throwing virtual impedance and changing a fault instruction set in the fault phase, specifically:
I max ＝max{I max-a ，I max-b }
wherein, I max Maximum current, I, supplied to the inverter max-a 、I max-b Respectively representing the a-phase maximum current and the b-phase maximum current, E, supplied by IIDG fa 、E fb Respectively representing phase a and phase b output voltages, V, of IIDG PCCa And V PCCb A-phase voltage and b-phase voltage of grid connection point, theta vsga And theta vsgb Initial phase, θ, of phase a and phase b of the IIDG output voltage, respectively fa And theta fb The initial phase of the voltage of the phase a and the phase b at the IIDG access point are respectively, R and L are respectively a resistor and an inductor which are accessed to a power transmission line of a power distribution network, and gamma and omega are respectively an impedance angle and angular frequency.
9. The method for setting power distribution network current protection in consideration of the inverter power control strategy according to claim 3, wherein the determination of the protection installation position is performed, and the setting is performed according to the protection installation position, specifically:
s1, judging whether a protection position is installed at the upstream of an IIDG, if so, executing a step S2, and otherwise, executing a step S3;
s2, judging whether the protection is I-section protection, if so, performing setting calculation on the current protection without considering the influence of the IIDG, and finishing the setting, otherwise, executing the step S4;
s3, determining a protection setting type, wherein the protection setting type comprises a section I protection and a section II protection, and if the protection setting type is the section I protection, executing the step S5;
s4, setting according to the following formula:
wherein, I act-II 、I act-I For respectively protecting setting value and K of section II and section I rel-II Reliability factor, K, for segment II protection b Is the branching coefficient;
branch coefficient K at three-phase short-circuit fault b-3 Comprises the following steps:
wherein E is the power supply voltage of the distribution network, Z is the impedance of the power supply, Z AB Is the impedance of line AB, which is the line upstream of the IIDG access point, Z BC Is the impedance of line BC, which is the downstream line of IIDG access point, V PCC A voltage of the IIDG access point;
branching coefficient K at two-phase short-circuit fault b-2 Comprises the following steps:
wherein, I IIDG-A Is a positive sequence component, V, of the a-phase output current of IIDG PCCa+ A phase positive sequence voltage, Z, for IIDG access point AB+ And Z AB- Positive and negative sequence impedances, Z, respectively, of the line AB BC+ And Z BC- Positive and negative sequence impedances, Z, respectively, of the line BC + Positive sequence impedance for the power supply;
s5, setting according to the following formula:
wherein, K rel-I To protect the reliability factor of the I section.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117269838A (en) * | 2023-11-22 | 2023-12-22 | 中国电力科学研究院有限公司 | Method and system for determining short-circuit current of network-structured power electronic equipment |
| CN117895555A (en) * | 2024-03-12 | 2024-04-16 | 南方电网数字电网研究院股份有限公司 | Electric automobile fills electric pile that possesses trouble electric wire netting and supports and emergent power supply function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117269838A (en) * | 2023-11-22 | 2023-12-22 | 中国电力科学研究院有限公司 | Method and system for determining short-circuit current of network-structured power electronic equipment |
| CN117269838B (en) * | 2023-11-22 | 2024-01-30 | 中国电力科学研究院有限公司 | Method and system for determining short-circuit current of network-structured power electronic equipment |
| CN117895555A (en) * | 2024-03-12 | 2024-04-16 | 南方电网数字电网研究院股份有限公司 | Electric automobile fills electric pile that possesses trouble electric wire netting and supports and emergent power supply function |
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