CN113098009B - Uninterrupted loop closing and reverse electricity method for 30-degree angle difference system of power distribution network - Google Patents
Uninterrupted loop closing and reverse electricity method for 30-degree angle difference system of power distribution network Download PDFInfo
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- CN113098009B CN113098009B CN202110505386.1A CN202110505386A CN113098009B CN 113098009 B CN113098009 B CN 113098009B CN 202110505386 A CN202110505386 A CN 202110505386A CN 113098009 B CN113098009 B CN 113098009B
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Classifications
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
Abstract
The invention relates to a method for closing and reversing power of a 30-degree angle difference system of a power distribution network without power outage, which comprises the following steps of (1) defining a ring network; step (2), calculating ring network current of a ring network system to be closed; step (3) calculating a real current value after fitting the ring; and (4) a specific method for closing the ring and switching on the power without power failure. The invention can realize safe and reliable uninterrupted loop closing and reverse electricity, and avoid the problems that the impact is caused to the circuit equipment and the normal operation and the service life of the equipment are influenced due to the excessively high current value possibly existing in the operation process.
Description
Technical Field
The invention relates to a method for closing and reversing power of a 30-degree angle difference system of a power distribution network without power outage.
Background
In order to reduce the power failure time and improve the power supply reliability, the power distribution network of 110kV and below mainly realizes load transfer in a ring closing mode. With the rise of the requirement of power supply reliability, the power grid loop closing and opening operation of some areas accounts for 48.1% of the scheduled daily operation projects, but the premise is that the phase angles of the voltages at two sides are consistent or not much different.
The 35kV system with the angle difference of 30 degrees in the power system can only adopt a power failure and power reversal mode to transfer load according to a scheduling rule, so that power failure of a user is caused, and the difficulty of the user on the high-reliability requirement of the power is severely restricted.
Disclosure of Invention
The invention aims to provide a method for switching on and switching off a loop of a power distribution network 30-degree angle difference system, which can realize safe and reliable switching on and switching off the loop without power failure and avoid the problems that line equipment is impacted and normal operation and service life of the equipment are affected due to excessively high current value possibly existing in the operation process.
The technical scheme adopted for solving the technical problems is as follows: the uninterrupted power loop closing and reversing method for the power distribution network 30-degree angle difference system comprises the following steps of:
step (1), defining a ring network: a loop between a 35kV output end of a 220kV transformer substation, a plurality of 35kV transformer substations, a 35kV output end of a 110kV transformer substation, a 110kV input end of a 110kV transformer substation and a 110kV output end of the 220kV transformer substation, in which the to-be-closed loop switch is positioned, is defined as a to-be-closed loop network system with an angle difference of 30 degrees;
step (2), calculating the ring network current of the ring network system to be closed in the step (1); the ring network current value is the ring network voltage difference divided by the ring network total per unit impedance value; the voltage difference of the looped network is 37 kV-30 degrees;
when the per-unit value is calculated, the reference capacity SB is taken as 1000MVA, the average voltage of each voltage class is taken as the reference voltage to obtain a reference value, the reference value of the 35kV voltage is 37kV, the reference value of the 110kV voltage is 115kV, the reference value of the 10kV voltage is 10.5kV, the reference impedance value is equal to the square of the voltage reference value divided by the reference capacity SB, and the per-unit impedance value of each device is equal to the inherent impedance value of each device in the ring network system to be closed divided by the reference impedance value; the total per unit impedance value of the ring network is the sum of the per unit impedance values of all devices in the ring network system to be combined;
step (3), vector sum of the original load current value of each 35kV transformer substation in the ring network system to be closed and the ring network current value defines the real current value after the line model of the 35kV transformer substation is fitted with the ring;
step (4), a ring network current control method:
if the real current value is smaller than the equipment bearing capacity, directly closing a loop closing switch in a loop closing ring network system to be closed, and disconnecting a line switch to be shut down to finish uninterrupted loop closing and power reversal;
if the real current value is greater than or equal to the equipment bearing capacity, firstly judging whether a topological relation exists between the real current value and the 35kV output end of a 110kV transformer substation in a ring network system to be closed and an adjacent 110kV transformer substation without angle difference exists, if the real current value exists, closing a contact switch between a 35kV bus below the 35kV output end of the 110kV transformer substation in the ring network system to be closed and the 35kV output end of the adjacent 110kV transformer substation without angle difference, then opening the contact switch between the 35kV output end of the 110kV transformer substation and the 35kV bus, then closing the ring switch, at the moment, forming a new loop by the 35kV output end of the 220kV transformer substation, a plurality of 35kV transformer substations, the 35kV output end of the adjacent 110kV transformer substation, the 110kV input end of the adjacent 110kV transformer substation, and the 110kV output end of the 220kV transformer substation, then opening the contact switch of a to be shut down line, then closing the contact switch between the 35kV output end of the 110kV transformer substation and the 35kV bus in the ring system to be closed again, and finally opening the contact switch between the 35kV bus below the 35kV output end of the 110kV transformer substation and the 35kV output end of the adjacent 110kV transformer substation without angle difference; completing uninterrupted power closing and ring switching;
if 110kV transformer substations meeting the requirements do not exist, firstly closing the contact switches on the 10kV lines at the two ends of the ring closing switch in the ring closing ring network system, at the moment, forming a new loop by a 35kV transformer substation output end-a plurality of 35kV transformer substations-10 kV bus-contact switches-10 kV buses-a plurality of 35kV transformer substations-110 kV transformer substation 35kV output ends-110 kV transformer substation 110kV input ends-220 kV transformer substation 110kV output ends, then disconnecting the contact switches of the line to be shut down, closing the ring closing switch, and finally disconnecting the contact switches on the 10kV lines at the two ends of the ring closing switch in the ring closing ring network system, thereby completing uninterrupted power ring closing and switching.
Further, the method further comprises the following steps of setting a combining and decyclization protection constant value between the step (3) and the step (4): the three-section protection fixed values of all the devices in the ring network system to be closed are regulated to be larger than the real current value; considering the influence of impact current on protection, and modifying the protection fixed value time limit of each equipment I section from 0s to 10ms; so as to avoid the influence of the impact current on the protection device.
The invention has the beneficial effects that: when the impedance in a system loop with 30-degree angle difference is larger, loop closing operation loop current is calculated to obtain a real current value, and when the real current value does not exceed the bearing capacity of each device in a loop closing circuit, a loop closing switch can be directly closed, then a to-be-stopped circuit is disconnected, and the uninterrupted loop closing and reverse electricity operation is realized, so that the power failure time of a user is reduced, and the power supply reliability is improved. When the true current value exceeds the bearing capacity of each device in the loop closing circuit, the circuit with topological relation and the same voltage class or low voltage class is integrated into the loop closing circuit, loop impedance is increased, loop current is reduced, loop closing and loop opening operation is performed, and finally, the switching supply of the same voltage class or low voltage class is disconnected, so that uninterrupted loop closing and power reversing operation is completed, and meanwhile, the operation is ensured not to impact each device in the loop because of the overlarge true current, and normal operation and service life of the device are affected.
Drawings
Fig. 1 is a circuit schematic of the present invention.
Detailed Description
An embodiment, as shown in fig. 1, of a 30-degree angle difference system of a power distribution network, is a method for closing a loop and reversing power without power outage, comprising the following steps:
step (1), defining a ring network: a loop between a 35kV output end of a 220kV transformer substation, a plurality of 35kV transformer substations, a 35kV output end of a 110kV transformer substation, a 110kV input end of a 110kV transformer substation and a 110kV output end of the 220kV transformer substation, in which the to-be-closed loop switch is positioned, is defined as a to-be-closed loop network system with an angle difference of 30 degrees;
step (2), calculating the ring network current of the ring network system to be closed in the step (1); the ring network current value is the ring network voltage difference divided by the ring network total per unit impedance value; the voltage difference of the looped network is 37 kV-30 degrees;
when the per-unit value is calculated, the reference capacity SB is taken as 1000MVA, the average voltage of each voltage class is taken as the reference voltage to obtain a reference value, the reference value of the 35kV voltage is 37kV, the reference value of the 110kV voltage is 115kV, the reference value of the 10kV voltage is 10.5kV, the reference impedance value is equal to the square of the voltage reference value divided by the reference capacity SB, and the per-unit impedance value of each device is equal to the inherent impedance value of each device in the ring network system to be closed divided by the reference impedance value; the total per unit impedance value of the ring network is the sum of the per unit impedance values of all devices in the ring network system to be combined;
step (3), vector sum of the original load current value of each 35kV transformer substation in the ring network system to be closed and the ring network current value defines the real current value after the line model of the 35kV transformer substation is fitted with the ring;
step (4), a ring network current control method:
if the real current value is smaller than the equipment bearing capacity, directly closing a loop closing switch in a loop closing ring network system to be closed, and disconnecting a line switch to be shut down to finish uninterrupted loop closing and power reversal;
if the real current value is greater than or equal to the equipment bearing capacity, firstly judging whether a topological relation exists between the real current value and the 35kV output end of a 110kV transformer substation in a ring network system to be closed and an adjacent 110kV transformer substation without angle difference exists, if the real current value exists, closing a contact switch between a 35kV bus below the 35kV output end of the 110kV transformer substation in the ring network system to be closed and the 35kV output end of the adjacent 110kV transformer substation without angle difference, then opening the contact switch between the 35kV output end of the 110kV transformer substation and the 35kV bus, then closing the ring switch, at the moment, forming a new loop by the 35kV output end of the 220kV transformer substation, a plurality of 35kV transformer substations, the 35kV output end of the adjacent 110kV transformer substation, the 110kV input end of the adjacent 110kV transformer substation, and the 110kV output end of the 220kV transformer substation, then opening the contact switch of a to be shut down line, then closing the contact switch between the 35kV output end of the 110kV transformer substation and the 35kV bus in the ring system to be closed again, and finally opening the contact switch between the 35kV bus below the 35kV output end of the 110kV transformer substation and the 35kV output end of the adjacent 110kV transformer substation without angle difference; completing uninterrupted power closing and ring switching;
if 110kV transformer substations meeting the requirements do not exist, firstly closing the contact switches on the 10kV lines at the two ends of the ring closing switch in the ring closing ring network system, at the moment, forming a new loop by a 35kV transformer substation output end-a plurality of 35kV transformer substations-10 kV bus-contact switches-10 kV buses-a plurality of 35kV transformer substations-110 kV transformer substation 35kV output ends-110 kV transformer substation 110kV input ends-220 kV transformer substation 110kV output ends, then disconnecting the contact switches of the line to be shut down, closing the ring closing switch, and finally disconnecting the contact switches on the 10kV lines at the two ends of the ring closing switch in the ring closing ring network system, thereby completing uninterrupted power ring closing and switching.
The method further comprises the following steps of setting a combined protection constant value between the step (3) and the step (4): the three-section protection fixed values of all the devices in the ring network system to be closed are regulated to be larger than the real current value; considering the influence of impact current on protection, and modifying the protection fixed value time limit of each equipment I section from 0s to 10ms; so as to avoid the influence of the impact current on the protection device.
In the embodiment 2, on the basis of the embodiment 1, a 220kV transformer substation is defined as an A transformer substation, a 110kV transformer substation is defined as an F transformer substation, the 35kV ring network system further comprises a plurality of 35kV transformer substations, the 35kV transformer substations are defined as a B transformer substation, a C transformer substation, a D transformer substation and an E transformer substation, and the ring network system to be closed with 30-degree angle difference is a ring network system formed by a 35kV output end of the A transformer substation, a C transformer substation, a D transformer substation, an E transformer substation, an F transformer substation, a 35kV output end of the F transformer substation, a 110kV input end of the F transformer substation and a 110kV output end of the A transformer substation;
the loop closing switch is defined as a first interconnection switch 1, and the interconnection switch of the line to be shut down is defined as a second interconnection switch 2; the interconnection switch of the 35kV output end of the 110kV transformer substation is defined as a third channel switch 3; the tie switches on the 10kV lines at the two ends of the primary opening in the ring network system to be closed are defined as a fourth tie switch 4; a fifth interconnection switch 5 is defined by an interconnection switch between a 35kV bus below a 35kV output end of a 110kV transformer substation in a ring network system to be closed and a 35kV output end of an adjacent 110kV transformer substation without angle difference;
at the time of high voltage transfer in the step (4), the related 35kV transformer substation is defined as a G transformer substation, the adjacent 110kV transformer substation is defined as an H transformer substation, and the method is not limited to one G transformer substation, and is only illustrative; the fifth interconnecting switch 5 is closed, then the third interconnecting switch 3 is opened, and then the first interconnecting switch 1 is closed, at the moment, a ring network system is formed by the 35kV output end of the A transformer substation, the B transformer substation, the C transformer substation, the D transformer substation, the E transformer substation, the G transformer substation, the H transformer substation, the 35kV output end of the H transformer substation, the 110kV input end of the H transformer substation and the 110kV output end of the A transformer substation, a new ring network system is formed through high-voltage transfer, the total impedance in the ring network is increased, and the ring network current value is reduced; and then the fourth connecting switch 4 is disconnected, the third connecting switch 3 is closed again, and finally the fifth connecting switch 5 is disconnected, so that uninterrupted power supply, loop closing and power reversal are completed.
In the low-voltage transfer in the step (4), the related 35kV transformer substation is defined as an I transformer substation and a J transformer substation, and certainly not limited to the two transformer substations, and the transformer substations can be redundant or less; the fourth on-state communication switch 4, the 35kV output end of the A transformer substation, the B transformer substation, the C transformer substation, the I transformer substation, the J transformer substation, the D transformer substation, the E transformer substation, the F transformer substation, the 35kV output end of the F transformer substation, the 110kV input end of the F transformer substation and the 110kV output end of the A transformer substation form a ring network system, and a new ring network system is formed through low-voltage transfer, so that the total impedance in the ring network is increased to reduce the value of a ring network current; then the second connecting switch 2 is disconnected, the first connecting switch 1 is closed, and the fourth connecting switch 4 is disconnected, so that uninterrupted power supply, loop closing and power reversal are completed.
In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more. In addition, the term "include" and any variations thereof are intended to cover a non-exclusive inclusion.
The terminology used in the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The above embodiments are not to be taken in a limiting sense, but rather in an illustrative sense. The scope of the invention is indicated by the appended claims rather than by the foregoing description, and all differences within the scope as would be construed as being included in the present invention. As long as various insubstantial improvements are made using the method concepts and technical solutions of the present invention; or the invention is not improved, and the conception and the technical scheme are directly applied to other occasions and are all within the protection scope of the invention.
Claims (2)
1. The method for closing and reversing the power of the power distribution network by 30-degree angle difference system is characterized by comprising the following steps of: the method comprises the following steps:
step (1), defining a ring network: a loop between a 35kV output end of a 220kV transformer substation, a plurality of 35kV transformer substations, a 35kV output end of a 110kV transformer substation, a 110kV input end of a 110kV transformer substation and a 110kV output end of the 220kV transformer substation, in which the to-be-closed loop switch is positioned, is defined as a to-be-closed loop network system with an angle difference of 30 degrees;
step (2), calculating the ring network current of the ring network system to be closed in the step (1); the ring network current value is the ring network voltage difference divided by the ring network total per unit impedance value; the voltage difference of the looped network is 37 kV-30 degrees;
when the per-unit value is calculated, the reference capacity SB is taken as 1000MVA, the average voltage of each voltage class is taken as the reference voltage to obtain a reference value, the reference value of the 35kV voltage is 37kV, the reference value of the 110kV voltage is 115kV, the reference value of the 10kV voltage is 10.5kV, the reference impedance value is equal to the square of the voltage reference value divided by the reference capacity SB, and the per-unit impedance value of each device is equal to the inherent impedance value of each device in the ring network system to be closed divided by the reference impedance value; the total per unit impedance value of the ring network is the sum of the per unit impedance values of all devices in the ring network system to be combined;
step (3), vector sum of the original load current value of each 35kV transformer substation in the ring network system to be closed and the ring network current value defines the real current value after the line model of the 35kV transformer substation is fitted with the ring;
step (4), a ring network current control method:
if the real current value is smaller than the equipment bearing capacity, directly closing a loop closing switch in a loop closing ring network system to be closed, and disconnecting a line switch to be shut down to finish uninterrupted loop closing and power reversal;
if the real current value is greater than or equal to the equipment bearing capacity, firstly judging whether a topological relation exists between the real current value and the 35kV output end of a 110kV transformer substation in a ring network system to be closed and an adjacent 110kV transformer substation without angle difference exists, if the real current value exists, closing a contact switch between a 35kV bus below the 35kV output end of the 110kV transformer substation in the ring network system to be closed and the 35kV output end of the adjacent 110kV transformer substation without angle difference, then opening the contact switch between the 35kV output end of the 110kV transformer substation and the 35kV bus, then closing the ring switch, at the moment, forming a new loop by the 35kV output end of the 220kV transformer substation, a plurality of 35kV transformer substations, the 35kV output end of the adjacent 110kV transformer substation, the 110kV input end of the adjacent 110kV transformer substation, and the 110kV output end of the 220kV transformer substation, then opening the contact switch of a to be shut down line, then closing the contact switch between the 35kV output end of the 110kV transformer substation and the 35kV bus in the ring system to be closed again, and finally opening the contact switch between the 35kV bus below the 35kV output end of the 110kV transformer substation and the 35kV output end of the adjacent 110kV transformer substation without angle difference; completing uninterrupted power closing and ring switching;
if 110kV transformer substations meeting the requirements do not exist, firstly closing the contact switches on the 10kV lines at the two ends of the ring closing switch in the ring closing ring network system, at the moment, forming a new loop by a 35kV transformer substation output end-a plurality of 35kV transformer substations-10 kV bus-contact switches-10 kV buses-a plurality of 35kV transformer substations-110 kV transformer substation 35kV output ends-110 kV transformer substation 110kV input ends-220 kV transformer substation 110kV output ends, then disconnecting the contact switches of the line to be shut down, closing the ring closing switch, and finally disconnecting the contact switches on the 10kV lines at the two ends of the ring closing switch in the ring closing ring network system, thereby completing uninterrupted power ring closing and switching.
2. The method for closing and reversing power of a 30-degree angle difference system of a power distribution network according to claim 1, wherein the method comprises the following steps: the method further comprises the following steps of setting a combined protection constant value between the step (3) and the step (4): the three-section protection fixed values of all the devices in the ring network system to be closed are regulated to be larger than the real current value; considering the influence of impact current on protection, and modifying the protection fixed value time limit of each equipment I section from 0s to 10ms; so as to avoid the influence of the impact current on the protection device.
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| WO2015143846A1 (en) * | 2014-03-25 | 2015-10-01 | 国家电网公司 | Online real-time loop closing method based on integration of main network and distribution network |
| CN106444589A (en) * | 2016-12-06 | 2017-02-22 | 国网浙江省电力公司绍兴供电公司 | 30-degree phase angle difference distributing line loop closing and opening operation system |
| CN109449945A (en) * | 2018-11-22 | 2019-03-08 | 国网四川省电力公司天府新区供电公司 | Power distribution network based on the DG 10kV Alloy White Iron constraint adjusted turns for optimization method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015143846A1 (en) * | 2014-03-25 | 2015-10-01 | 国家电网公司 | Online real-time loop closing method based on integration of main network and distribution network |
| CN106444589A (en) * | 2016-12-06 | 2017-02-22 | 国网浙江省电力公司绍兴供电公司 | 30-degree phase angle difference distributing line loop closing and opening operation system |
| CN109449945A (en) * | 2018-11-22 | 2019-03-08 | 国网四川省电力公司天府新区供电公司 | Power distribution network based on the DG 10kV Alloy White Iron constraint adjusted turns for optimization method |
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