CN113972666A - Loop closing reactive circulation restraining method for power distribution network - Google Patents
Loop closing reactive circulation restraining method for power distribution network Download PDFInfo
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- 230000000452 restraining effect Effects 0.000 title claims abstract description 9
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- 101150013204 MPS2 gene Proteins 0.000 claims description 14
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a power distribution network loop closing reactive power circulation restraining method, wherein a back-to-back mixed sub-module MMC device is connected in parallel on a 10KV bus; the MMC device is used for compensating reactive circulation Q generated by closed-loop operation of a superior power grid according to a control strategy while providing reactive power compensation for a transformer substation and a loadCThe stable operation of the system and the normal work of the load are ensured; the technical problems that in the prior art, the size of electromagnetic circulation is changed by adjusting the tap joint of the transformer, but the adjustment of the tap joint of the transformer is not flexible, the requirement is high, the service life of equipment is influenced by frequent operation of a mechanical switch and the like are solved.
Description
Technical Field
The invention belongs to the technology of reactive circulation control of a power distribution network, and particularly relates to a method for restraining closed-loop reactive circulation of the power distribution network.
Background
The operation mode that the distribution network mainly adopted is "closed loop design, open loop operation", along with distribution network's continuous development, the power supply mode of distribution network bidirectional power supply and many power supplies power supply increases day by day, under the power supply mode, when the power failure overhauls, through joining in marriage net closed loop operation when sudden event or load transfer, realizes not having the power failure and shifts the load and can guarantee that the distribution network is to the reliable power supply of user, improves the economic nature of distribution network operation. However, when the loop closing operation is performed, a large electromagnetic circulating current appears in the feeder line after the loop closing operation is performed due to voltage and phase difference on two sides of the loop closing operation, so that the safety and stability of a power grid are directly affected, the normal work of a load is affected, and even large-area power failure is seriously caused. Therefore, the problem to be solved is to inhibit electromagnetic circulation from becoming closed loop operation. In order to solve the problem, the prior art changes the size of the electromagnetic circulation by adjusting the tap of the transformer, but the adjustment of the tap of the transformer is not flexible and has high requirements, and the service life of the equipment is also influenced by frequent operation of the mechanical switch.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the utility model provides a power distribution network closed-loop reactive circulation restraining method, which aims to solve the technical problems that the adjustment of a transformer tap is not flexible and has high requirements, the frequent operation of a mechanical switch can also influence the service life of equipment, and the like, in the prior art, the size of electromagnetic circulation is changed by adjusting the transformer tap.
The technical scheme of the invention is as follows:
a loop closing reactive circulation restraining method for a power distribution network comprises the following steps: a back-to-back mixed sub-module MMC device is connected in parallel on the 10KV bus; the MMC device is used for compensating reactive circulation Q generated by closed-loop operation of a superior power grid according to a control strategy while providing reactive power compensation for a transformer substation and a loadCAnd the stable operation of the system and the normal work of the load are ensured.
And a standby switch is also connected in parallel to the 10KV bus, and the standby switch is in an open state when the MMC device works normally.
Reactive circulation Q generated by compensation of loop closing operation of upper-level power gridCThe method comprises the following steps: the two MMC reactive outer ring reference values of the MMC device are different, and reactive powers at two ends can generate a difference value; this value is combined with the reactive circulation Q generated by the upper distribution networkCEqual in size and opposite in direction, thereby realizing reactive circulation QCCompensation of (2).
Reactive circulation QCThe calculation method comprises the following steps: firstly, through load flow calculation of a dispatching center, the estimated reactive closed-loop current Q during closed-loop operation of a power grid is calculatedPreparation of(ii) a Measuring the actual reactive loop closing current Q in the loop closing operation of the power grid at the loop closing positionFruit of Chinese wolfberryDesired reactive circulation QcComprises the following steps:
Qc＝Qfruit of Chinese wolfberry-QPreparation of。
The MC device comprises MMC1 and MCC2, MMC1 and MCC2 connected back-to-back.
MMC1 adopts constant direct current voltage UdcAnd an outer loop controller for constant reactive power Q1, reference Q1refReactive power Q set to transformer consumptionT1Reactive power Q consumed by loadL1By subtracting reactive closed-loop current QCThe value of (c). Namely:
Q1ref＝QT1+QL1-QC
QT1and QL1Calculating according to the load flow of the power dispatching center;
MMC2 adopts an outer loop controller with constant active power P and constant reactive power Q2, and has a reference value Q2refReactive power Q set to transformer consumptionT2Reactive power Q consumed by loadL2And closed loop reactive circulation QCThe value of (c). Namely:
Q2ref＝QT2+QL2+QC
QT2and QL2And calculating according to the load flow of the power dispatching center.
The control strategy comprises the following steps:
step 1, load flow calculation of a dispatching center;
step 2, reactive circulation calculation during loop closing operation;
step 3, setting a reference value of the MMC outer ring controller;
step 4, double-loop control;
step 5, park transformation dq → abc;
step 6, modulating a strategy and controlling voltage stabilization;
step 7, the MMC maintains the voltage of the direct current side and compensates the reactive power;
and 8, finishing the loop closing reactive circulation suppression of the power distribution network.
The invention has the beneficial effects that:
the invention is based on a back-to-back MMC device (B2B-MMC), and achieves the purpose of restraining loop-closing reactive circulation when the loop-closing operation of a power distribution network is carried out by using the characteristics and functions of the device.
The reactive power regulation of the back-to-back MMC generates a reactive circulation in the 110KV/10KV ring network, the reactive circulation is the same as the reactive circulation generated by the closed-loop operation of the upper-level 220KV/110KV power grid, and the reactive circulation is opposite in direction, so that the inhibition effect on the reactive circulation during the closed-loop operation of the power grid is realized, and the safe and stable operation of the power grid and the normal operation of the load are ensured.
The invention has the advantages that:
and carrying out real-time reactive power compensation on the transformer substation and the load.
And the active control and the reactive control are mutually decoupled by using a vector control mode to realize independent control, and the response speed is high.
Reactive circulation generated by loop closing of the superior distribution network is restrained, and safety and stability of the power grid are guaranteed.
The technical problems that in the prior art, the size of electromagnetic circulation is changed by adjusting the tap joint of the transformer, but the adjustment of the tap joint of the transformer is not flexible, the requirement is high, the service life of equipment is influenced by frequent operation of a mechanical switch and the like are solved.
Description of the drawings:
fig. 1 is a schematic diagram of a wiring mode of a power distribution network loop closing reactive circulation suppression technology based on a back-to-back mixed sub-module MMC device in an embodiment of the present invention;
FIG. 2 is a dual-ring control block diagram of an MMC1 in a back-to-back mixed sub-module MMC device according to an embodiment of the present invention;
FIG. 3 is a dual-loop control block diagram of an MMC2 in a back-to-back hybrid sub-module MMC device embodying the present invention;
fig. 4 is a flowchart of a control strategy of the back-to-back mixed sub-module MMC device of the present invention.
Detailed Description
The method comprises the following steps:
when the loop closing operation is performed on a 110KV bus of a 220KV transformer substation, due to different loads of the transformer substations, a considerable voltage difference occurs between the stations, and a loop current is generated when an electromagnetic looped network operates, so that the loss of a transformer is increased, the output capacity is reduced, and the sensitivity of a protection device and the breaking capacity of a breaker are reduced. The MMC device with back-to-back mixed sub-modules is connected to a 10KV bus of a 110KV transformer substation, so that the problem can be solved, the MMC device is used for compensating reactive circulation generated by loop closing operation of a superior power grid, and stable operation of a system and normal operation of loads are guaranteed. The wiring mode is shown in the figure I.
Reactive circulation Q generated by closed-loop operation to be compensatedCFirst, the magnitude of the reactive circulating current needs to be calculated. The predicted reactive closed-loop current Q during the closed-loop operation of the power grid can be calculated through the load flow calculation of the dispatching centerPreparation ofAnd can measure the power grid closed loop operation at the closed loop positionActual reactive loop-closing current QFruit of Chinese wolfberryThen the desired reactive circulation QcComprises the following steps:
Qc＝Qfruit of Chinese wolfberry-QPreparation of
MMC1 adopts constant direct current voltage UdcAnd an outer loop controller for constant reactive power Q1, reference Q1refReactive power Q set to transformer consumptionT1Reactive power Q consumed by loadL1By subtracting reactive closed-loop current QCThe value of (c). Namely:
Q1ref＝QT1+QL1-QC
MMC2 adopts an outer loop controller with constant active power P and constant reactive power Q2, and has a reference value Q2refReactive power Q set to transformer consumptionT2Reactive power Q consumed by loadL2And closed loop reactive circulation QCThe value of (c). Namely:
Q2ref＝QT2+QL2+QC
QT1、QL1、QT2、QL2and calculating according to the load flow of the power dispatching center.
MMC1 reference value UdcrefAnd MMC2 reference value PrefIs determined by the optimization of the schedule to the mode of operation.
When the MMC provides real-time reactive power compensation for the transformer and the load, due to the fact that the reference values of the two MMC reactive outer rings are different, the reactive power at the two ends can generate a difference value. This value is combined with the reactive circulation Q generated by the upper distribution networkCEqual in size and opposite in direction, thereby realizing reactive circulation QCThe inhibition effect of the control system ensures the safety and stability of the closed-loop operation of the 220KV/110KV power distribution network.
The technical solution of the present invention is further described below by way of example:
fig. 1 is a wiring mode of a power distribution network loop closing reactive circulation current suppression method based on a back-to-back mixed sub-module MMC device according to an embodiment of the present invention. The invention aims at the problem that the looped network generates reactive circulation when the 220KV/110KV power distribution network operates in a loop closing mode, which influences the safety and stability of the system and the normal work of a loadA back-to-back mixed sub-module MMC device is connected in parallel on a 10KV bus, and the problem is solved through reactive power compensation. The content contained in the common functions of the device is not the content of the invention, and the invention is a new function and a new technology which are expanded beyond the common functions. As can be seen from the wiring diagram, while the B2B-MMC device provides reactive power compensation for the transformer substation and the load, the reactive power output by the two MMCs generates a difference value through a control strategy, so that a reactive circulation Q generated by loop closing with a superior distribution network is formed in a 110KV/10KV looped networkCReactive circulating currents with the same size and opposite directions achieve the effect of inhibition. The 011 switch is a standby switch and is in an open state when the B2B-MMC device is in normal operation.
Fig. 2 is a double-loop control strategy block diagram of an MMC1 of a power distribution network loop-closing reactive current circulation restraining method based on a back-to-back mixed sub-module MMC device according to an embodiment of the present invention. The MMC1 is responsible for maintaining the stability of the dc side voltage of the B2B-MMC device while providing reactive power compensation. Measure the DC voltage UdcGenerating a reference value i of a current inner loop controller through an active outer loop and a reactive outer loop with MMC1 reactive power Q1dref、iqrefAnd the voltage instruction output by the inner ring and the phase instruction of the phase-locked loop are subjected to park conversion, and the MMC1 control is completed after modulation strategy and voltage-sharing control.
Fig. 3 is a double-loop control strategy block diagram of an MMC2 of a power distribution network loop-closing reactive current circulation suppression method based on a back-to-back mixed sub-module MMC device according to an embodiment of the present invention. Measuring reference values i of MMC2 active power P and reactive power Q2 through an active outer ring and a reactive outer ring to generate current inner ring controllerdref、iqrefAnd the voltage instruction output by the inner ring and the phase instruction of the phase-locked loop are subjected to park conversion, and the MMC2 control is completed after modulation strategy and voltage-sharing control.
Fig. 4 is an MMC control strategy of a power distribution network loop closing reactive circulation current suppression method based on a back-to-back mixed sub-module MMC device in an embodiment of the present invention, including the following steps:
step 401: calculating the load flow of a dispatching center;
step 402: calculating reactive circulation during loop closing operation;
step 403: setting a reference value of an MMC outer ring controller;
step 404: double-loop control;
step 405: park transform dq → abc;
step 406: modulation strategy and voltage stabilization control;
step 407: the MMC maintains the voltage of the direct current side and compensates the reactive power;
step 408: and finishing the loop closing reactive circulation suppression of the power distribution network.
The scheduling center load flow calculation in step 401 may calculate the predicted closed-loop current Q of the power distribution network during closed-loop operationPreparation ofAnd reactive power Q consumed by the substation and the loadT1、QL1、QT2、QL2。
Wherein, in the step 402, the reactive circulation calculation during loop closing operation has the following calculation formula:
Qc＝Qfruit of Chinese wolfberry-QPreparation of
Wherein the MMC outer ring controller reference value setting in step 403 is MMC1 reference value UdcrefAnd MMC2 reference value PrefThe setting of the reactive power is determined according to the optimization of the scheduling to the operation mode, and the reactive power reference value is determined by the following setting formula:
Q1ref＝QT1+QL1-QC
Q2ref＝QT2+QL2+QC。
Claims (8)
1. a power distribution network loop closing reactive circulation restraining method is characterized by comprising the following steps: the method comprises the following steps: a back-to-back mixed sub-module MMC device is connected in parallel on the 10KV bus; the MMC device is used for compensating reactive circulation Q generated by closed-loop operation of a superior power grid according to a control strategy while providing reactive power compensation for a transformer substation and a loadCAnd the stable operation of the system and the normal work of the load are ensured.
2. The method for suppressing closed-loop reactive power circulation of the power distribution network according to claim 1, characterized in that: and a standby switch is also connected in parallel to the 10KV bus, and the standby switch is in an open state when the MMC device works normally.
3. The method for suppressing closed-loop reactive power circulation of the power distribution network according to claim 1, characterized in that: reactive circulation Q generated by compensation of loop closing operation of upper-level power gridCThe method comprises the following steps: the two MMC reactive outer ring reference values of the MMC device are different, and reactive powers at two ends can generate a difference value; this value is combined with the reactive circulation Q generated by the upper distribution networkCEqual in size and opposite in direction, thereby realizing reactive circulation QCCompensation of (2).
4. The method for suppressing closed-loop reactive power circulation of the power distribution network according to claim 1, characterized in that: reactive circulation QCThe calculation method comprises the following steps: firstly, through load flow calculation of a dispatching center, the estimated reactive closed-loop current Q during closed-loop operation of a power grid is calculatedPreparation of(ii) a Measuring the actual reactive loop closing current Q in the loop closing operation of the power grid at the loop closing positionFruit of Chinese wolfberryDesired reactive circulation QcComprises the following steps:
Qc＝Qfruit of Chinese wolfberry-QPreparation of。
5. The method for suppressing closed-loop reactive power circulation of the power distribution network according to claim 1, characterized in that: the MC device comprises MMC1 and MCC2, MMC1 and MCC2 connected back-to-back.
6. The method for suppressing closed-loop reactive power circulation of the power distribution network according to claim 5, wherein the method comprises the following steps:
MMC1 adopts constant direct current voltage UdcAnd an outer loop controller for constant reactive power Q1, reference Q1refReactive power Q set to transformer consumptionT1Reactive power Q consumed by loadL1By subtracting reactive closed-loop current QCThe value of (c). Namely:
Q1ref＝QT1+QL1-QC
QT1and QL1And calculating according to the load flow of the power dispatching center.
7. The method for suppressing closed-loop reactive power circulation of the power distribution network according to claim 5, wherein the method comprises the following steps:
MMC2 adopts an outer loop controller with constant active power P and constant reactive power Q2, reference value
Q2refReactive power Q set to transformer consumptionT2Reactive power consumed by load
QL2And closed loop reactive circulation QCThe value of (c). Namely:
Q2ref＝QT2+QL2+QC
QT2and QL2And calculating according to the load flow of the power dispatching center.
8. The method for suppressing closed-loop reactive power circulation of the power distribution network according to claim 1, characterized in that: the control strategy comprises the following steps:
step 1, load flow calculation of a dispatching center;
step 2, reactive circulation calculation during loop closing operation;
step 3, setting a reference value of the MMC outer ring controller;
step 4, double-loop control;
step 5, park transformation dq → abc;
step 6, modulating a strategy and controlling voltage stabilization;
step 7, the MMC maintains the voltage of the direct current side and compensates the reactive power;
and 8, finishing the loop closing reactive circulation suppression of the power distribution network.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104269861A (en) * | 2014-10-13 | 2015-01-07 | 国家电网公司 | Electromagnetic looped network reactive power ring current optimal control method based on flexible looped network controller |
| CN106961106A (en) * | 2017-05-05 | 2017-07-18 | 贵州电网有限责任公司电力科学研究院 | A kind of low-voltage network multiterminal joint electric power-feeding structure based on IPFC |
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- 2021-11-16 CN CN202111356601.2A patent/CN113972666A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104269861A (en) * | 2014-10-13 | 2015-01-07 | 国家电网公司 | Electromagnetic looped network reactive power ring current optimal control method based on flexible looped network controller |
| CN106961106A (en) * | 2017-05-05 | 2017-07-18 | 贵州电网有限责任公司电力科学研究院 | A kind of low-voltage network multiterminal joint electric power-feeding structure based on IPFC |
Non-Patent Citations (1)
| Title |
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| 刘博文;于雷;: "基于模块化多电平直流输电技术的电磁环网潮流优化控制", 电气开关, no. 02, 15 April 2017 (2017-04-15) * |
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