CN111952970B - Method and device for closing loop and regulating electricity of power distribution network - Google Patents
Method and device for closing loop and regulating electricity of power distribution network Download PDFInfo
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- CN111952970B CN111952970B CN202010824815.7A CN202010824815A CN111952970B CN 111952970 B CN111952970 B CN 111952970B CN 202010824815 A CN202010824815 A CN 202010824815A CN 111952970 B CN111952970 B CN 111952970B
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- 230000010363 phase shift Effects 0.000 claims description 22
- 238000004804 winding Methods 0.000 claims description 13
- 230000001276 controlling effect Effects 0.000 claims description 5
- 230000001052 transient effect Effects 0.000 claims description 3
- 230000009466 transformation Effects 0.000 description 4
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- 238000010079 rubber tapping Methods 0.000 description 2
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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
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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Abstract
The application discloses a method and a device for loop closing and power regulating of a power distribution network, wherein the method comprises a controller, a phase-shifting transformer and a loop closing switch; the voltage amplitude and phase angle of the single side are adjusted through the phase-shifting transformer, the voltage amplitude phase angle difference of the two ends of the closed loop is changed, the phase-shifting transformer is used as a basis, the current-limiting reactor is connected in series, and the voltage amplitude phase angle difference of the single side bus and the voltage amplitude phase angle of the other end are adjusted to be within a certain safety range through decoupling control of the single side bus, so that safe closed loop power regulation is realized, the influence of closed loop power regulation on the normal operation of a power distribution network can be effectively solved, and the power supply reliability and safety are improved.
Description
Technical Field
The application relates to the technical field of power distribution network operation, in particular to a power distribution network loop closing and power regulating method and device.
Background
At present, the distribution network in China generally performs closed-loop design and open-loop operation in consideration of the influence of short-circuit current on the operation of the system and the equipment. When a certain bus, switch or feeder needs to be overhauled or fails, the load of the multi-power supply on the bus, switch or feeder can be transferred, and the load is transferred to other buses or feeders connected with the same through loop closing operation, so that uninterrupted load reversing, namely loop closing power regulation, is realized. The power cut time of a user can be reduced by closing the ring and adjusting the power, the reliability of power supply is improved, the power supply quality of the system is ensured, and the satisfaction degree of the public to the power service is improved. With the increase of the power load density, the power grid structure is more and more complicated, the double-power supply is more and more supplied by multiple power supplies, and the uninterrupted reverse load is a necessary trend through the operation of closing and opening the ring.
When the transformer substations belonging to two different partitions are subjected to loop closing and power regulation, the risks of equipment overload, relay protection misoperation, exceeding of short-circuit current, accident expansion caused by electromagnetic looped network and the like possibly occur due to overlarge loop closing tide under the influence of the running condition of the system and the parameters of the power grid, and the safety of the power grid is influenced. The main problem caused by the ring closing operation is that a certain voltage phase difference exists between buses at two sides of a ring closing switch or a contact switch before the ring closing, so that excessive ring closing current can be generated in the ring closing operation, quick-break protection or overcurrent protection misoperation is caused, the power failure area is enlarged, and bad results are caused.
Therefore, to ensure safe loop closing, the voltage difference and phase angle difference of buses at two ends of the loop closing switch must be minimized, and the loop closing current must be controlled within a range that can be borne by equipment and systems (without damaging the equipment, causing protection malfunction, etc.). In order to achieve the purpose, at present, the most common method is to adjust the running mode of a power grid, and adjust the bus voltage difference and the phase angle difference by adjusting the upper power supply loop or putting reactive equipment such as a shunt reactor, a capacitor and the like into the power grid. However, the method is limited by the distribution condition of system equipment, has limited adjusting capability, and needs to perform a large amount of mode calculation no matter adjusting the upper power supply loop closing or changing other operation modes, so that the heavy field operation is often brought while the calculation workload is increased.
Disclosure of Invention
The application provides a loop closing power regulating method and device for a power distribution network, which are used for solving the problems of economic and social influence caused by short-time power failure and poor power supply reliability in loop closing power regulating under the scene of large voltage amplitude and phase angle difference of a bus of the power distribution network.
A loop closing and power regulating method for a power distribution network comprises the following steps:
s1: collecting voltage signals U on two sides of ring switch 1 And U 2 Calculating a voltage phase angle amplitude difference value;
s2: according to the voltage phase angle amplitude difference, calculating a phase shift range and a voltage regulating range of the phase shift transformer;
s3: determining a phase-shifting control signal Kp and a voltage-regulating control signal Ka according to the phase-shifting range and the voltage-regulating range;
s4: according to the phase shift control signal Kp to U 1 Performing phase shifting operation, and performing U-phase shifting according to the voltage regulation control signal Ka 1 Performing voltage regulation operation to obtain voltage U after phase-shifting voltage regulation operation 3 ；
S5: judging the phase angle amplitude difference value of the voltage U3 subjected to the phase shifting and voltage regulating operation and the voltage U2, and controlling a loop closing switch to be closed for loop closing and power regulating;
and S6, the phase-shifting transformer is regulated, the bus-tie switch is closed, and the branch of the phase-shifting transformer is withdrawn from the power distribution network, so that the loop-closing power regulation is realized.
Optionally, the step of judging the voltage U after the phase-shifting voltage-regulating operation 3 And the voltage U 2 The phase angle amplitude difference of (2) is:
if the voltage U after the phase-shifting voltage-regulating operation 3 If the phase angle amplitude difference is larger than the preset phase angle amplitude difference threshold value, the S3 operation is executed again;
if the voltage U is subjected to phase-shifting voltage-regulating operation 3 If the phase angle amplitude difference is smaller than or equal to a preset phase angle amplitude difference threshold value, controlling the closed loop switch to be closed, and conducting closed loop power regulation;
the phase angle amplitude difference threshold value can be adjusted in real time according to the use requirement.
A loop closing and power regulating device of a power distribution network comprises a controller, a phase shifting transformer and a loop closing switch;
the controller is configured to collect U on two sides of the loop closing switch 1 And U 2 Calculating a voltage phase angle amplitude difference; according to the voltage phase angle amplitude difference, calculating the phase shift range and the voltage regulating range of the phase shift transformer; further determining a phase-shifting control signal Kp and a voltage-regulating control signal Ka according to the phase-shifting range and the voltage-regulating range; the controller is further configured to send an instruction to the closed loop switch;
the phase-shifting transformer is configured to control U by shifting the phase according to a phase-shifting control signal Kp 1 Performing phase shift operation according to the voltage regulation control signal KaTo U 1 Performing pressure regulating operation;
optionally, the loop closing switch includes QF101, QF102, QF103 and a fast switch KS, and is configured to receive a controller instruction to perform loop closing and power regulating operation of the power distribution network.
Optionally, the phase-shifting transformer comprises a first transformer, a second transformer and a third transformer, the first transformer is a series transformer, the low-voltage winding contact of the first transformer is positioned at the midpoint of the high-voltage winding, and the second transformer and the third transformer are respectively connected with a switch to regulate the voltage phase angle.
Optionally, the power distribution network closed loop power regulating device further comprises a current limiting reactor, the current limiting reactor is connected with the phase-shifting transformer in series, the current limiting reactor is configured to stabilize the impact current of the closed loop transient process, and the current limiting reactor is further configured to limit the short circuit current and protect primary equipment when the closed loop operation has a short circuit fault.
Optionally, the fast switch KS is configured to implement loop closing and power regulating in cooperation with the phase-shifting transformer, and is further configured to isolate faults before the short-circuit current reaches a peak value, so as to protect primary equipment.
Optionally, after the device realizes loop closing and power adjustment through the phase-shifting transformer, the phase-shifting transformer needs to be adjusted back, after the input and output difference range of the phase-shifting transformer is within a preset threshold range, the female switch QF103 is closed, the quick switch KS is opened at the same time, and finally the loop closing and power adjustment is realized through the female switch.
According to the technical scheme, the method and the device for loop closing and power regulating of the power distribution network are provided, the voltage amplitude and the phase angle of a single side are regulated through the phase-shifting transformer, the voltage amplitude phase angle difference of two ends of the loop closing is changed, the phase-shifting transformer is used as a basis, the current-limiting reactors are connected in series, the voltage amplitude phase angle difference of the single side bus and the voltage amplitude phase angle difference of the other end are regulated to be within a certain safety range through decoupling control of the single side bus, and therefore the loop closing and power regulating of the power distribution network is achieved, the influence of the loop closing and power regulating on the normal operation of the power distribution network can be effectively solved, and the power supply reliability and safety are improved.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic flow chart of a closed loop power regulation method of a power distribution network according to the present application;
fig. 2 is a schematic connection diagram of a closed loop power regulating device of the power distribution network;
FIG. 3 is a schematic diagram of the phase-shifting transformer of the present application;
fig. 4 is a flowchart of the power distribution network closed loop power regulating device.
Detailed Description
As shown in fig. 1, a loop closing power regulating method for a power distribution network includes the following steps:
s1: collecting voltage signals U on two sides of ring switch 1 And U 2 Calculating a voltage phase angle amplitude difference value;
s2: according to the voltage phase angle amplitude difference, calculating a phase shift range and a voltage regulating range of the phase shift transformer;
s3: determining a phase-shifting control signal Kp and a voltage-regulating control signal Ka according to the phase-shifting range and the voltage-regulating range;
s4: according to the phase shift control signal Kp to U 1 Performing phase shifting operation, and performing U-phase shifting according to the voltage regulation control signal Ka 1 Performing voltage regulation operation to obtain voltage U after phase-shifting voltage regulation operation 3 ；
S5: judging the phase angle amplitude difference value of the voltage U3 subjected to the phase shifting and voltage regulating operation and the voltage U2, and controlling a loop closing switch to be closed for loop closing and power regulating;
and S6, the phase-shifting transformer is regulated, the bus-tie switch is closed, and the branch of the phase-shifting transformer is withdrawn from the power distribution network, so that the loop-closing power regulation is realized.
The voltage U after the phase shifting voltage regulating operation is judged 3 And the voltage U 2 The phase angle amplitude difference of (2) is:
if the voltage U after the phase-shifting voltage-regulating operation 3 If the phase angle amplitude difference is larger than the preset phase angle amplitude difference threshold value, the S3 operation is executed again;
if the voltage U is subjected to phase-shifting voltage-regulating operation 3 If the phase angle amplitude difference is smaller than or equal to a preset phase angle amplitude difference threshold value, controlling the closed loop switch to be closed, and conducting closed loop power regulation;
the phase angle amplitude difference threshold value can be adjusted in real time according to the use requirement.
More specifically, the phase-shifting transformer is pulled back, the bus-bar switch is closed, the phase-shifting transformer is withdrawn from the branch, and the loop-closing power regulation through the bus-bar switch is realized.
As shown in fig. 2, a loop closing power regulating device of a power distribution network comprises a controller, a phase shifting transformer and a loop closing switch;
the controller is configured to collect U on two sides of the loop closing switch 1 And U 2 Calculating a voltage phase angle amplitude difference; according to the voltage phase angle amplitude difference, calculating the phase shift range and the voltage regulating range of the phase shift transformer; further determining a phase-shifting control signal Kp and a voltage-regulating control signal Ka according to the phase-shifting range and the voltage-regulating range; the controller is further configured to send an instruction to the closed loop switch. More specifically, the controller realizes the control of the switches QF101, QF102, QF103, the fast switch KS and the phase-shifting transformer by integrating the control of the function related to the ring closing and the relay protection.
The phase-shifting transformer is configured to control U by shifting the phase according to a phase-shifting control signal Kp 1 Or U (U) 2 Performing phase shifting operation, and adjusting U according to the voltage regulation control signal Ka 1 Performing pressure regulating operation;
the ring closing switch comprises QF101, QF102, QF103 and a quick switch KS, and is configured to receive a controller instruction and perform ring closing and power regulating operation of the power distribution network. More specifically, the QF103 switch is used for connecting the phase-shifting transformer branch into or out of a power distribution network.
The phase-shifting transformer comprises a first transformer, a second transformer and a third transformer, wherein the first transformer is a series transformer, a contact of a low-voltage winding of the first transformer is positioned at the midpoint of a high-voltage winding, and the second transformer and the third transformer are respectively connected with different switches to regulate a voltage phase angle. As shown in fig. 3, the three-phase inputs of the phase-shifting transformer are A1, B1 and C1, and the outputs are A2, B2 and C2. The whole transformer is composed of 3 transformers, namely a first transformer, a second transformer and a third transformer, wherein the first transformer is a series transformer, the common winding occupies half of the high-voltage winding, namely the low-voltage winding contact is positioned at the midpoint of the high-voltage winding, the second transformer and the third transformer can realize automatic adjustment of transformation ratios Kp and Ka through a tapping switch, and the tapping switch of the second transformer integrates a polarity change-over switch to realize 180-degree turnover of the primary side voltage and the secondary side voltage of the transformer, so that the advanced or lagged adjustment of a voltage phase angle can be conveniently realized. Therefore, by adjusting the transformation ratio Kp of the second transformer, the voltage phase can be adjusted by matching with the first transformer under the condition of not changing the voltage amplitude, and after the voltage phase shifting is completed, the voltage amplitude can be continuously changed by adjusting the transformation ratio Ka of the third transformer.
Further, the power distribution network closed loop power regulating device further comprises a current limiting reactor, the current limiting reactor is connected with the phase-shifting transformer in series, the current limiting reactor is configured to stabilize impact current in closed loop and bypass transient processes, and the current limiting reactor is further configured to limit short-circuit current and protect primary equipment when the closed loop runs short-circuit faults.
In some embodiments, as shown in FIG. 4, when the device is operating normally, the controller is configured to collect the voltage U across the closed loop switch 1 And U 2 And (3) calculating voltage phase angle amplitude difference values according to analog quantities, and simultaneously acquiring opening and closing position signals of the switches QF101, QF102 and QF103 and the quick switch KS. The controller calculates the phase shift and voltage regulation range of the phase shift transformer according to the voltage phase angle amplitude difference, so as to determine a phase shift control signal Kp and a voltage regulation control signal Ka. Considering that the taps of the phase-shifting transformer are not continuous, a method for determining the phase-shifting control signal Kp and the voltage-regulating control signal Ka according to the voltage phase angle amplitude difference may adopt a table look-up method or a piecewise function analysis method. According to the determined phase-shifting control signal Kp, regulating the tap of the phase-shifting transformer T2 part to make its transformation ratio reach to finish the voltage U 1 Is (are) phase shiftedWork is performed. According to the determined voltage regulation control signal Ka, regulating the tap of the phase-shifting transformer T3 part to finish the voltage U 1 Is used for regulating the voltage. Comparison U 1 Voltage U after phase-shifting and voltage-regulating 3 And voltage U 2 If the phase angle amplitude difference of the phase-shifting transformer meets the requirement of the closed-loop power regulation rule, the process carries out the next operation, and if the phase angle amplitude difference of the phase-shifting transformer does not meet the requirement, the phase-shifting range and the voltage regulation range of the phase-shifting transformer are recalculated, so that the phase-shifting control signal Kp and the voltage regulation control signal Ka are determined. And continuing to perform voltage comparison and calculation of the phase-shift control signal Kp and the voltage regulation control signal Ka. On the fast switch KS, power V 1 And power supply V 2 And loop closing power supply is realized through the phase-shifting transformer and the reactor. And closing the QF103 bus switch. The quick switch KS is disconnected, the phase-shifting transformer and the series reactor are withdrawn, and the power supply V is realized 1 And power supply V 2 And (5) closing a ring and regulating electricity. According to the field overhaul requirement, the switch on either side of the QF101 or the QF102 is disconnected, and the power supply of the load is not affected.
Further, the fast switch KS is configured to cooperate with the phase-shifting transformer to realize loop closing and power regulation, and is further configured to isolate faults before the short-circuit current reaches a peak value, so as to protect primary equipment.
Furthermore, after the device realizes loop closing and power adjustment through the phase-shifting transformer, the phase-shifting transformer needs to be adjusted back, after the input and output difference range of the phase-shifting transformer is within a preset threshold range, the female switch QF103 is closed, the quick switch KS is opened at the same time, and finally the loop closing and power adjustment is realized through the female switch. More specifically, the loss can be reduced, and the influence on the operation of the distribution network is further reduced.
As can be seen from the above technical solutions, the embodiments of the present application provide a method and apparatus for loop closing and power conditioning of a power distribution network, including a controller, a phase-shifting transformer, and a loop closing switch; the voltage amplitude and phase angle of the single side are adjusted through the phase-shifting transformer, the voltage amplitude phase angle difference of the two ends of the closed loop is changed, the phase-shifting transformer is used as a basis, the current-limiting reactors are connected in series, and the voltage amplitude phase angle difference of the single side and the voltage amplitude phase angle of the other end are adjusted to be within a certain safety range through decoupling control of the bus voltage amplitude phase angle, so that safe closed loop power regulation is realized, the influence of closed loop power regulation on the normal operation of a power distribution network can be effectively solved, and the power supply reliability and safety are improved.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It is to be understood that the invention is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (4)
1. The method for regulating power of the power distribution network by closing the ring is characterized by comprising the following steps of:
collecting voltage signals U on two sides of ring switch 1 And U 2 Calculating a voltage phase angle amplitude difference value;
according to the voltage phase angle amplitude difference, calculating a phase shift range and a voltage regulating range of the phase shift transformer;
determining a phase-shifting control signal Kp and a voltage-regulating control signal Ka according to the phase-shifting range and the voltage-regulating range;
according to the phase shift control signal Kp to U 1 Performing phase shifting operation, and performing U-phase shifting according to the voltage regulation control signal Ka 1 Performing voltage regulation operation to obtain voltage U after phase-shifting voltage regulation operation 3 ；
Judging the voltage U after the phase-shifting voltage-regulating operation 3 And the voltage U 2 The phase angle amplitude difference value of the closed loop switch is controlled to be closed according to the judging result, and closed loop power regulation is carried out;
the phase-shifting transformer comprises a first transformer, a second transformer and a third transformer, wherein the first transformer is a series transformer, a contact of a low-voltage winding of the first transformer is positioned at the midpoint of a high-voltage winding, and the second transformer and the third transformer are respectively connected with different switches to regulate the amplitude and the phase angle of the voltage; performing phase shifting operation with unchanged amplitude on U1 according to the position of the low-voltage winding contact of the first transformer and the phase shifting control signal Kp of the second transformer, and performing voltage regulating operation with unchanged phase on U1 according to the voltage regulating control signal Ka of the third transformer;
and (3) turning back the phase-shifting transformer, closing the bus-tie switch, and withdrawing the phase-shifting transformer branch from the power distribution network to realize loop closing and power regulation.
2. The method for regulating power supply of a power distribution network according to claim 1, wherein the voltage U after the phase-shifting voltage-regulating operation is determined 3 And the voltage U 2 The specific steps include:
if the voltage U after the phase-shifting voltage-regulating operation 3 If the voltage is larger than the preset phase angle amplitude difference threshold, the operation of calculating the phase shift range and the voltage regulating range of the phase shift transformer according to the voltage phase angle amplitude difference is executed again;
if the voltage U is subjected to phase-shifting voltage-regulating operation 3 And if the phase angle amplitude difference threshold value is smaller than or equal to the preset phase angle amplitude difference threshold value, controlling the closed loop switch to be closed, and conducting closed loop power regulation.
3. The power distribution network loop closing and regulating device is characterized by comprising a controller, a phase shifting transformer and a loop closing switch;
the controller is configured to collect U on two sides of the loop closing switch 1 And U 2 Calculating a voltage phase angle amplitude difference; according to the voltage phase angle amplitude difference, calculating the phase shift range and the voltage regulating range of the phase shift transformer; further determining a phase-shifting control signal Kp and a voltage-regulating control signal Ka according to the phase-shifting range and the voltage-regulating range; the controller is further configured to send an instruction to the closed loop switch;
the phase-shifting transformer is configured to control U by shifting the phase according to a phase-shifting control signal Kp 1 Performing phase shifting operation, and adjusting U according to the voltage regulation control signal Ka 1 Performing pressure regulating operation;
the ring closing switch comprises QF101, QF102, QF103 and a quick switch KS, and is configured to receive a controller instruction and perform ring closing and power regulating operation of the power distribution network;
the phase-shifting transformer comprises a first transformer, a second transformer and a third transformer, wherein the first transformer is a series transformer, a low-voltage winding contact of the first transformer is positioned at the midpoint of a high-voltage winding, and the second transformer and the third transformer are respectively connected with different switches to regulate a voltage phase angle;
the power distribution network loop closing power regulating device further comprises a current limiting reactor, the current limiting reactor is connected with the phase shifting transformer in series, the current limiting reactor is configured to stabilize impact current in a loop closing transient process, and the current limiting reactor is further configured to limit short-circuit current and protect primary equipment when a loop closing operation short-circuit fault occurs;
after the device realizes loop closing and power adjustment through the phase-shifting transformer, the phase-shifting transformer needs to be adjusted back, after the input and output difference range of the phase-shifting transformer is within a preset threshold range, the female switch QF103 is closed, the quick switch KS is simultaneously opened, and finally the loop closing and power adjustment is realized through the female switch.
4. The power distribution network closed loop power regulating device according to claim 3, wherein the fast switch KS is configured to cooperate with a phase-shifting transformer to realize closed loop power regulating, and is further configured to isolate faults before the short-circuit current reaches a peak value, so as to protect primary equipment.
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| CN202010824815.7A CN111952970B (en) | 2020-08-17 | 2020-08-17 | Method and device for closing loop and regulating electricity of power distribution network |
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| CN202010824815.7A CN111952970B (en) | 2020-08-17 | 2020-08-17 | Method and device for closing loop and regulating electricity of power distribution network |
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| CN112821389A (en) * | 2021-01-19 | 2021-05-18 | 广州科技贸易职业学院 | Double-bus power supply-based loop closing system and method |
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| CN115940165B (en) * | 2023-02-28 | 2023-05-30 | 江苏省电力试验研究院有限公司 | Phase shifter control method and system for realizing power flow control between transformers |
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