CN113937779A - Closed loop switching supply adjusting method based on phase-shifting transformer - Google Patents
Closed loop switching supply adjusting method based on phase-shifting transformer Download PDFInfo
- Publication number
- CN113937779A CN113937779A CN202111186738.8A CN202111186738A CN113937779A CN 113937779 A CN113937779 A CN 113937779A CN 202111186738 A CN202111186738 A CN 202111186738A CN 113937779 A CN113937779 A CN 113937779A
- Authority
- CN
- China
- Prior art keywords
- phase
- voltage
- adjustment
- setting value
- transformer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 83
- 230000009466 transformation Effects 0.000 claims abstract description 59
- 238000012546 transfer Methods 0.000 claims abstract description 58
- 230000008569 process Effects 0.000 claims abstract description 46
- 230000001105 regulatory effect Effects 0.000 claims abstract description 20
- 238000004804 winding Methods 0.000 claims description 90
- 230000033228 biological regulation Effects 0.000 claims description 31
- 230000005284 excitation Effects 0.000 claims description 30
- 238000001514 detection method Methods 0.000 claims description 15
- 238000013461 design Methods 0.000 claims description 8
- 238000010079 rubber tapping Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 21
- 230000000694 effects Effects 0.000 description 10
- 230000008859 change Effects 0.000 description 9
- 238000004088 simulation Methods 0.000 description 6
- 230000010363 phase shift Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
-
- 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]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The application relates to a closed loop switching supply adjusting method based on a phase-shifting transformer, which comprises the steps of firstly determining an adjusting demand transformation ratio setting value of initial adjustment of the phase-shifting transformer; then acquiring a voltage difference between the loop closing device and a target regulating bus, and determining a compensation voltage required by the voltage difference generated by the internal resistance of the loop closing device and a corresponding compensation voltage transformation ratio setting value; and then determining the amplitude adjustment quantity and the phase adjustment quantity of the phase-shifting transformer after the compensation voltage is added, and determining a corresponding amplitude adjustment transformation ratio setting value and a corresponding phase adjustment transformation ratio setting value according to the amplitude adjustment quantity and the phase adjustment quantity so as to adjust a tap of the phase-shifting transformer to complete closed-loop switching supply adjustment. According to the method, the variable ratio value of the loop closing device based on the phase-shifting transformer is gradually updated and set, the constant-amplitude phase shifting adjustment of the loop closing transfer supply voltage can be realized, and the voltage quality and the power supply reliability in the process of loop closing transfer supply adjustment are improved.
Description
Technical Field
The application relates to the technical field of power distribution networks of power systems, in particular to a phase-shifting transformer-based closed loop switching supply adjusting method.
Background
With the deep reformation of power system, the concept of green sustainable development is continuously strengthened. The strategic target of the power industry is to construct a novel power system which takes new energy as a main body and has the characteristics of wide interconnection, intelligent interaction, flexibility, safety, controllability and the like. The improvement of the power supply reliability of the power distribution network is one of important indexes of a novel power system. With the increasing demand of power users, the network structure is becoming more complex, and in order to improve the voltage quality and the power supply reliability, it is a necessary trend to realize the load shedding without power cut through the loop closing operation.
A Phase Shifting Transformer (PST), also called a phase angle adjuster, has equal voltages on the power supply side and the load side, but generates a phase shift between its primary side. The phase-shifting transformer adjusts the voltage phase by changing the tap, so as to adjust the voltage and the current of the power system, thereby improving the operation stability and the reliability of the power system. The phase-shifting transformer is provided in the thirties of the twentieth century, the traditional phase-shifting technology is relatively mature, the operation and the maintenance are relatively easy, and the economy is remarkable, so that the phase-shifting transformer can be applied to a loop closing device for loop closing transfer. However, the conventional phase-shifting transformer is only suitable for a scenario with only voltage phase adjustment requirements, a certain limitation exists for a scenario with both amplitude adjustment requirements and phase adjustment requirements, and in order to meet an application scenario with both amplitude adjustment requirements and phase adjustment requirements, the conventional phase-shifting transformer applied to the loop closing device needs to be correspondingly improved. However, voltage regulation is performed only by considering the requirement of amplitude and phase regulation of the power distribution network, and due to the existence of the internal resistance of the loop closing device, a large voltage drop is generated on the power distribution line, so that obvious negative effects are generated on the voltage quality and the power supply reliability. In order to meet complex application scenarios and ensure higher voltage quality and power supply reliability, a loop-closing switching and power supply adjusting method based on a phase-shifting transformer is required to be provided.
Disclosure of Invention
The application provides a phase-shifting transformer-based loop closing transfer adjusting method, which aims to solve the problems that the traditional mode of utilizing the phase-shifting transformer to carry out loop closing transfer cannot meet the requirements of amplitude adjustment and phase adjustment at the same time, and the voltage quality and the power supply reliability are not high when the loop closing transfer is carried out.
The application solves the technical problem and provides a loop closing transfer and supply adjusting method based on a phase shifting transformer, which comprises the following steps:
determining an adjustment requirement transformation ratio setting value of initial adjustment of the phase-shifting transformer;
acquiring a voltage difference between the loop closing device and a target regulating bus;
determining a compensation voltage and a compensation voltage transformation ratio setting value according to the adjustment demand transformation ratio setting value and the voltage difference;
determining the amplitude adjustment quantity and the phase adjustment quantity of the phase-shifting transformer after the compensation voltage is increased;
determining a corresponding phase adjustment transformation ratio setting value and an amplitude adjustment transformation ratio setting value according to the amplitude adjustment quantity and the phase adjustment quantity;
and adjusting a tapping tap of the phase-shifting transformer according to the phase adjustment variable ratio setting value and the amplitude adjustment variable ratio setting value.
Furthermore, the setting of the adjustment demand transformation ratio setting value is obtained by the ratio of the voltage amplitude or the voltage phase adjustment demand corresponding to each setting object to the primary winding input voltage of the excitation transformer.
Further, the setting of the compensation voltage transformation ratio setting value is obtained by a ratio of a voltage difference value and an input voltage of a primary winding of the excitation transformer, and the voltage difference value is a voltage difference value between a loop closing device detected by the voltage detection element and a target adjusting bus after the voltage detection element exits from the power supply to be overhauled.
Furthermore, the setting design of the amplitude regulation transformation ratio setting value is according to a formula
Calculated, in the formula: k is a radical ofmIndicating the amplitude regulation transformation ratio setting, Δ VmRepresenting the amplitude adjustment requirement, kcIndicating the compensation voltage regulation transformation ratio setting value, VstShowing the voltage in the process of closed loop transfer supply adjustment, theta shows the initial voltage phase difference of the 1# bus and the 2# bus, and theta0The phase is adjusted in reverse for each gear.
Further, the setting design of the phase adjustment transformation ratio setting value is according to a formula
Calculated, in the formula: k is a radical ofpIndicating the phase-regulated ratio-of-set, Δ VpIndicating the phase adjustment demand, VstShowing the voltage in the process of closed loop transfer supply adjustment, theta shows the initial voltage phase difference of the 1# bus and the 2# bus, and theta0The phase is adjusted in reverse for each gear.
Further, the regulation demand variable ratio setting value comprises an amplitude regulation demand variable ratio setting value and a phase regulation demand variable ratio setting value.
The technical scheme provided by the application comprises the following beneficial technical effects:
the application provides a closed-loop switching supply adjusting method based on a phase-shifting transformer, which comprises the steps of firstly determining an adjusting demand transformation ratio setting value of initial adjustment of the phase-shifting transformer, namely the adjusting demand transformation ratio setting value of the adjusting demand without considering the internal resistance of the phase-shifting transformer; adjusting the corresponding tap to an initial fixed value, closing a switch on the output side of the phase-shifting transformer, putting the phase-shifting transformer into the loop closing device, detecting and acquiring a voltage difference between the output side of the loop closing device and a target adjusting bus, determining a compensation voltage required by the voltage difference generated by the internal resistance of the loop closing device, and determining a corresponding compensation voltage transformation ratio setting value; detecting the voltage change of the distribution line caused by the increase of the compensation voltage, determining the amplitude adjustment quantity and the phase adjustment quantity of the phase-shifting transformer after the increase of the compensation voltage, and determining a corresponding amplitude adjustment transformation ratio setting value and a corresponding phase adjustment transformation ratio setting value according to the amplitude adjustment quantity and the phase adjustment quantity; and finally, adjusting a tap of the phase-shifting transformer according to the phase and amplitude adjusting transformation ratio setting value to finish closed-loop switching and power supply adjustment. According to the method, the transformation ratio of the loop closing device based on the phase-shifting transformer is gradually updated and set, then the transformation ratio setting values of the amplitude and phase adjusting windings are determined, and the loop closing transfer supply adjustment is completed according to the transformation ratio setting values of the amplitude and phase adjusting windings, so that the constant-amplitude phase shifting adjustment of the loop closing transfer supply voltage can be realized, and the voltage quality and the power supply reliability in the process of the loop closing transfer supply adjustment are improved.
Drawings
Fig. 1 is a schematic diagram of a loop closing scenario based on a phase-shifting transformer according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a phase-shifting transformer according to an embodiment of the present application;
FIG. 3 is a wiring diagram of a single-phase adjustment structure of the phase-shifting transformer according to an embodiment of the present application;
fig. 4 is a flowchart of a loop-closing switching power adjusting method based on a phase-shifting transformer according to an embodiment of the present application;
FIG. 5 is a voltage variation diagram of a loop-closing transfer supply adjusting process based on a phase-shifting transformer according to an embodiment of the present application;
FIG. 6 is a graph of voltage variation for an ideal regulation process provided by an embodiment of the present application;
fig. 7 is a transformer ratio setting analysis diagram of an excitation transformer provided in the embodiment of the present application;
FIG. 8 is a voltage waveform diagram of a whole process of ring closing transfer without using the phase shifting transformer and the adjusting method according to the embodiments of the present application;
FIG. 9 is a voltage waveform diagram of the loop-locked loop transfer process after compensation voltage is added according to an embodiment of the present application;
FIG. 10 is a voltage waveform diagram of a loop-locked loop transfer supply whole process of the phase shifting transformer and the adjusting method according to the embodiment of the present application;
FIG. 11 is a partial enlarged view of the voltage waveform of the whole process without using the phase shifting transformer and the adjusting method of the embodiments of the present application for loop closing transfer;
FIG. 12 is a partial enlarged view of the voltage waveform of the loop-closing transfer process after the compensation voltage is increased according to the embodiment of the present application;
FIG. 13 is an enlarged partial view of the voltage waveforms of the loop-closing transfer supply overall process of the phase shifting transformer and the adjusting method according to the embodiments of the present application;
fig. 14 is a waveform diagram of power comparison for a loop closing transfer regulation process according to an embodiment of the present application.
Description of reference numerals: 1-loop closing device, 2-first power supply, 3-second power supply, 4-first load, 5-second load, 6-series transformer, 7-exciting transformer, 11-first switching auxiliary switch, 12-second switching auxiliary switch, 13-third switching auxiliary switch, 14-fourth switching auxiliary switch, 15-fifth switching auxiliary switch, 16-phase-shifting transformer, 17-first detecting element, 18-second detecting element, 61-series transformer A phase input side, 62-series transformer B phase input side, 63-series transformer C phase input side, 64-series transformer A phase output side, 65-series transformer B phase output side, 66-series transformer C phase output side, 67-series transformer A phase winding, 68-series transformer B phase winding, 69-series transformer C phase winding, 71-exciter transformer a phase winding, 72-exciter transformer a phase amplitude regulating winding, 73-exciter transformer a phase amplitude regulating winding, 74-exciter transformer B phase winding, 75-exciter transformer B phase amplitude regulating winding, 76-exciter transformer B phase regulating winding, 77-exciter transformer C phase winding, 78-exciter transformer C phase amplitude regulating winding, 79-exciter transformer C phase amplitude regulating winding.
Detailed Description
To facilitate the description and understanding of the claimed subject matter, some concepts related to the present subject matter are first described below.
The setting means that whether the normal operation current of the electrical equipment is within the setting current range of the upper-level protection switch or not must be tested before the electrical equipment is put into normal operation. Because the theoretical value of the electrical design and the operation value of the equipment have objective deviation, if the deviation is overlarge and exceeds the setting value, the action of the relay protection equipment is triggered, and the safety of personal equipment is protected.
Referring to fig. 1, an embodiment of the present application provides a schematic diagram of a loop closing scenario based on a phase-shifting transformer. As shown in fig. 1, in a loop closing scenario based on a phase-shifting transformer, a dual power distribution system having a first power supply 2 and a second power supply 3 is both in 10kV voltage class, and a loop closing device 1 based on a phase-shifting transformer 16 is installed between two buses; the switching-on and switching-off device further comprises a first switching-on auxiliary switch 11, a second switching-on auxiliary switch 12, a third switching-on auxiliary switch 13, a fourth switching-on auxiliary switch 14 and a fifth switching-on auxiliary switch 15, and the switching-on and the switching-off of the phase-shifting transformer 16 and the loop closing device 1 are completed through the mutual matching of different switching-on auxiliary switches, so that the whole loop closing and switching-on process is completed. In use, the first detecting element 17 and the second detecting element 18 are used for detecting parameter information of a desired adjustment object. When a certain bus related device or feeder needs to be overhauled or has a fault, the two detection elements and the five closing auxiliary switches are coordinated and matched to carry out the closing operation on the closing ring device, and the load is transferred to other buses or feeders connected with the closing ring device, so that the load is reversed without power failure, namely the closing ring transfer is realized.
Referring to fig. 2, a schematic diagram of a phase-shifting transformer provided in the embodiment of the present application is shown. The phase-shifting transformer shown in fig. 2 comprises a series transformer 6 and an excitation transformer 7; the series transformer 6 comprises three-phase series windings, a three-phase input side and a three-phase output side, wherein the three-phase series windings are respectively a series transformer A phase winding 67, a series transformer B phase winding 68 and a series transformer C phase winding 69, the three-phase input sides are respectively a series transformer A phase input side 61, a series transformer B phase input side 62 and a series transformer C phase input side 63, the three-phase output sides are respectively a series transformer A phase output side 64, a series transformer B phase output side 65 and a series transformer C phase output side 66, the three-phase input side of the series transformer 6 is respectively used as the three-phase input side of the phase-shifting transformer, and the three-phase output side of the series transformer 6 is respectively used as the three-phase output side of the phase-shifting transformer; the exciting transformer 7 includes three-phase exciting windings, three-phase amplitude adjusting windings and three-phase adjusting windings, the three-phase exciting windings are respectively an exciting transformer a-phase winding 71, an exciting transformer B-phase winding 74 and an exciting transformer C-phase winding 77, the three-phase amplitude adjusting windings are respectively an exciting transformer a-phase amplitude adjusting winding 72, an exciting transformer B-phase amplitude adjusting winding 75 and an exciting transformer C-phase amplitude adjusting winding 78, and the three-phase adjusting windings are respectively an exciting transformer a-phase adjusting winding 73, an exciting transformer B-phase adjusting winding 76 and an exciting transformer C-phase adjusting winding 79. And the three-phase amplitude regulating winding of the exciting transformer 7 is decoupled and regulated with the corresponding three-phase regulating winding. The primary winding of the series transformer is connected into a circuit, and the middle tap of the primary winding is connected with the high-voltage side of the excitation transformer to play a role in excitation.
According to the structure wiring diagram of fig. 2, a wiring diagram of a single-phase adjusting structure can be obtained, taking phase a as an example, see fig. 3, and the wiring diagram of the phase-shifting transformer phase a adjusting structure provided by the embodiment of the present application. As shown in fig. 3, one end of the exciter a-phase amplitude adjustment winding 72 of the exciter transformer 7 is connected to the tap K of the exciter C-phase adjustment winding 79cpOne end of the excitation transformer C-phase adjusting winding 79 is connected with the excitation transformer B-phase adjusting winding 76, and a tap K of the excitation transformer B-phase adjusting winding 76bpSecondary winding ST through phase A winding 67 of series transformera2Tapping K of A-phase amplitude regulating winding 72 of excitation transformeramConnected, the setting can satisfy the regulation demand of A looks. The voltage of the exciting transformer A-phase amplitude adjusting winding 72 is the same as the phase of the induced voltage of the exciting transformer A-phase primary winding 71, the adjusting effect is to adjust the amplitude of the output voltage, the difference between the serial voltage of the exciting transformer B-phase adjusting winding 76 and the exciting transformer C-phase adjusting winding 79 and the phase of the induced voltage of the exciting transformer A-phase primary winding 71 is 90 degrees, and the adjusting effect is to adjust the phase of the output voltage.
Similarly, the wiring mode of the phase-shifting transformer B-phase adjusting structure can be obtained: one end of an exciting transformer B phase amplitude adjusting winding 75 of the exciting transformer is connected with a tapping tap of an exciting transformer A phase adjusting winding 73 of the exciting transformer, one end of the exciting transformer A phase adjusting winding 73 is connected with an exciting transformer C phase adjusting winding 79, and the tapping tap of the exciting transformer C phase adjusting winding 79 is connected with the tapping tap of the exciting transformer B phase amplitude adjusting winding 75 through a secondary winding of a series transformer B phase winding 68 of the series transformer, so that the B phase adjusting requirement can be met; the voltage of the exciting transformer B phase amplitude adjusting winding 75 is the same as the phase of the induced voltage of the exciting transformer B phase winding 74 primary winding, the adjusting effect is to adjust the amplitude of the output voltage, the difference between the series voltage of the exciting transformer C phase adjusting winding 79 and the exciting transformer A phase adjusting winding 73 and the phase of the induced voltage of the exciting transformer B phase primary winding 74 is 90 degrees, and the adjusting effect is to adjust the phase of the output voltage.
The wiring mode of the phase-shifting transformer C-phase adjusting structure is as follows: one end of an excitation transformer C-phase amplitude adjusting winding 78 of the excitation transformer is connected with a tapping tap of an excitation transformer B-phase adjusting winding 76 of the excitation transformer, one end of the excitation transformer B-phase adjusting winding 76 is connected with an excitation transformer A-phase adjusting winding 73, and the tapping tap of the excitation transformer A-phase adjusting winding 73 is connected with the tapping tap of the excitation transformer C-phase amplitude adjusting winding 78 through a secondary winding of a series transformer C-phase winding 69 of the series transformer, so that the C-phase adjusting requirement can be met; the voltage of the excitation transformer C-phase amplitude adjusting winding 78 is the same as the phase of the induced voltage of the excitation transformer C-phase primary winding 77, the adjusting effect is to adjust the amplitude of the output voltage, the difference between the serial voltage of the excitation transformer A-phase adjusting winding 73 and the excitation transformer B-phase adjusting winding 76 and the phase of the induced voltage of the excitation transformer C-phase primary winding 77 is 90 degrees, and the adjusting effect is to adjust the phase of the output voltage.
The embodiment of the application provides a closed loop transfer supply adjusting method based on a phase-shifting transformer, and the method is based on the phase-shifting transformer provided by the embodiment of the application, in the closed loop transfer supply voltage adjusting process, the amplitude and phase adjusting requirements are considered, compensation processing is carried out on the change of the voltage amplitude, and the adjustment of the phase shift of the constant amplitude of the closed loop transfer supply voltage is realized.
Referring to fig. 4, a flowchart of a loop-closing switching supply adjusting method based on a phase-shifting transformer is provided in an embodiment of the present application, where the method includes the following steps:
firstly, determining that a first closing auxiliary switch 11, a second closing auxiliary switch 12 and a fourth closing auxiliary switch 14 are closed, a third closing auxiliary switch 13 and a fifth closing auxiliary switch 15 are opened, namely, supplying power to a closed loop device, and determining an amplitude regulation requirement when a compensation voltage is not applied to an application scene phase-shifting transformer and a corresponding amplitude regulation requirement transformation ratio setting value k through a first detection element 17 and a second detection element 18mfPhase adjustment requirement and corresponding phase adjustment requirement transformation ratio setting value kpfI.e. the initial setting value.
In the formula: Δ VmfIndicating the initial amplitude adjustment requirement, V0Indicating the primary winding induced voltage, V, of the initial excitation transformerlRepresenting the voltage of the second power supply, VsRepresents the voltage of the first power supply, theta represents the initial voltage phase difference between the 1# bus and the 2# bus, and delta VpfIndicating the initial phase adjustment demand.
The part being a subsequent given compensation voltage VcAnd final amplitude regulation transformation ratio setting value kmAnd phase adjustment transformation ratio setting value kpAnd providing a reference basis for adjusting the effect.
Then the third closing auxiliary switch 13 is closed, the first closing auxiliary switch 11 is opened, the switching supply and switching off are completed, at the moment, the voltage difference delta V between the loop closing device and the target regulating bus is determined through the first detection element 17 and the second detection element 18, and the compensation voltage V required by the voltage difference generated by the internal resistance of the loop closing device is further determinedcCalculating a corresponding compensation voltage transformation ratio setting value kc。
In the formula: k is a radical ofmfIndicating the amplitude regulation demand transformation ratio setting value, VcRepresents the compensation voltage, V0Indicating the primary winding induced voltage, V, of the initial excitation transformerlRepresenting the voltage of the second power supply, VsThe voltage of the first power supply is shown, and theta represents the initial voltage phase difference between the 1# bus and the 2# bus.
Given compensation voltage VcThe negative influence on the voltage quality and the power supply reliability in the process of regulating the loop closing switching power supply voltage by the loop closing device is eliminated;
finally, for increasing the compensation voltage VcDetecting the resulting output voltage variation of the phase-shifting transformer to determine the increased compensation voltage VcThe amplitude and phase adjustment requirements of the phase-shifting transformer are met, and the amplitude adjustment transformation ratio setting value k of the corresponding adjustment quantity is determinedmAnd phase adjustment transformation ratio setting value kp. Amplitude regulation transformation ratio setting value kmAnd phase adjustment transformation ratio setting value kpThe tap of the phase-shifting transformer is adjusted according to the two determined transformation ratio setting values, after the reverse adjustment is finished, the fifth closing auxiliary switch 15 is closed, the third closing auxiliary switch 13 is disconnected, namely, the uninterrupted loop-closing switching adjustment is finished, and the voltage quality and the power supply reliability are further improved.
Wherein, the amplitude adjustment requires a transformation ratio setting value kmfAnd phase adjustment demand transformation ratio setting value kpfThe setting of the transformer is obtained by detecting the ratio of the required regulation quantity and the input voltage of the primary winding of the excitation transformer by the detection element.
Compensation voltage transformation ratio setting value kcThe setting method is that when the loop closing transfer stage is completed, the voltage difference between the loop closing device and the target regulating bus detected by the detection element is obtained by the ratio of the input voltage of the primary winding of the excitation transformer.
Amplitude regulation transformation ratio setting value kmThe setting design is according to a formula
Calculated, in the formula: Δ VmRepresenting the amplitude adjustment requirement, kcIndicating the compensation voltage regulation transformation ratio setting value, VstShowing the voltage in the process of closed loop transfer supply adjustment, theta shows the initial voltage phase difference of the 1# bus and the 2# bus, and theta0The phase is adjusted in reverse for each gear.
Phase adjustment transformation ratio setting value kpThe setting design is according to a formula
Calculated, in the formula: Δ VpIndicating the phase adjustment demand, VstShowing the voltage in the process of closed loop transfer supply adjustment, theta shows the initial voltage phase difference of the 1# bus and the 2# bus, and theta0The phase is adjusted in reverse for each gear.
According to the adjusting method provided by the embodiment of the application, amplitude and phase adjustment is realized through the combined action of the amplitude modulation winding and the phase modulation winding of the exciting transformer in the phase-shifting transformer.
Referring to fig. 5, a voltage variation diagram of a loop-closing switching supply regulation process based on a phase-shifting transformer is provided in the embodiment of the present application. As shown in fig. 5, when only the phase shift adjustment function of the phase shift transformer is considered, the loop closing device performs loop closing transfer, when the first power supply 2 is exited, a voltage difference occurs between the 1# bus and the 2# bus due to the existence of the internal resistance of the loop closing device, and the voltage difference gradually decreases along with the proceeding of the adjustment process, a specific voltage difference is obtained by the detection of the first detecting element 17 and the second detecting element 18, and the actual voltage change trajectory L during the adjustment process of the loop closing device in the initial processfactA stepwise change is present as shown in fig. 11. According to the voltage difference value, the amplitude regulation transformation ratio setting value is optimally designed, and then compensation voltage V is provided for the regulated output value of the phase-shifting transformercTo eliminate the effect of this voltage difference on the voltage quality, but to give a compensation voltage VcAfterwards, the actual voltage change track L in the adjusting process of the loop closing devicefactStill exhibiting a stepwise change as shown in FIG. 12, in order to make the actual voltage change trace LfactChange locus L from ideal circular arcideaWhen the phases coincide, the transformation ratio of the transformer needs to be further adjusted, so that a constant voltage amplitude is realized in the adjustment process, that is, as shown in fig. 13.
Referring to fig. 6, an ideal adjustment process voltage variation graph is provided by the embodiment of the present application. As shown in FIG. 6, the ideal adjustment process is the actual voltage variation trace LfactChange locus L from ideal circular arcideaAnd (4) coinciding. To achieve this purpose, referring to fig. 7, the excitation transformer winding transformation ratio setting analysis chart provided by the embodiment of the present application, as shown in fig. 7, if V is setstThe changing track of the closed loop is a section of circular arc, the voltage quality in the closed loop transfer process can be obviously improved, and V in the figurestShowing the voltage in the process of closed loop transfer and supply adjustment, theta shows the initial voltage phase difference of the 1# bus and the 2# bus detected by the two detection devices, and theta0The phase of each reverse regulation is shown, Δ V represents the regulation quantity required in the regulation process, and the component of Δ V is represented by Δ VpAnd Δ VmIs represented by Δ VpIndicating the amount of phase adjustment, Δ VmIndicating the amount of amplitude adjustment. Δ VpAnd Vst、ΔVmAnd VstThe relationship of (a) can be obtained according to the following formula:
in the formula: Δ VpIndicating the phase adjustment demand, Δ VmIndicating the magnitude of the adjustment, VstIndicating the voltage, V, during loop-closed transfer regulationsRepresents the voltage of the first power supply, theta represents the initial voltage phase difference between the 1# bus and the 2# bus, and theta0The phase is adjusted in reverse for each gear.
Due to VstIs a section of arc and has a Vst＝VsThen, we can get:
in the formula: Δ VpIndicating the phase adjustment demand, Δ VmIndicating the magnitude of the adjustment, VsRepresents the voltage of the first power supply, theta represents the initial voltage phase difference between the 1# bus and the 2# bus, and theta0The phase is adjusted in reverse for each gear.
The final transformation ratio setting value can be obtained according to the winding wiring relation of the coil in the figure 2, the phasor relation of the coil in the figure 7 and the formula:
in the formula, kmRepresenting the amplitude adjustment variable ratio, kpRepresenting the phase adjustment variable ratio, Δ VpIndicating the phase adjustment demand, Δ VmIndicating the phase adjustment demand, VstRepresenting the voltage, k, during loop-closed transfer regulationcShowing the compensation voltage ratio, theta shows the initial voltage phase difference of the 1# bus and the 2# bus, theta0The phase is adjusted in reverse for each gear.
The phase-shifting transformer and the loop closing transfer adjusting method based on the phase-shifting transformer provided by the embodiment of the present application are simulated, referring to fig. 8, fig. 9 and fig. 10, fig. 8 is a voltage waveform diagram of an overall process of loop closing transfer without using the phase-shifting transformer and the adjusting method provided by the embodiment of the present application, fig. 9 is a voltage waveform diagram of an overall process of loop closing transfer after adding compensation voltage provided by the embodiment of the present application, and fig. 10 is a voltage waveform diagram of an overall process of loop closing transfer of the phase-shifting transformer and the adjusting method provided by the embodiment of the present application. Fig. 11, 12, and 13 are partial enlarged views of voltage waveforms of the closed-loop transfer overall process, which correspond to fig. 8, 9, and 10, respectively, fig. 11 is a partial enlarged view of voltage waveforms of the closed-loop transfer overall process, which is provided by the embodiment of the present application and is not performed by using the phase-shifting transformer and the adjusting method according to the embodiment of the present application, fig. 12 is a partial enlarged view of voltage waveforms of the closed-loop transfer overall process, which is provided by the embodiment of the present application and is performed after adding the compensation voltage, and fig. 13 is a partial enlarged view of voltage waveforms of the closed-loop transfer overall process, which is provided by the embodiment of the present application and is performed by using the phase-shifting transformer and the adjusting method according to the embodiment of the present application.
In order to analyze the loop-closing transfer adjustment process more clearly, an analysis description will be made mainly with reference to fig. 11, 12 and 13. And setting the full simulation time to be 5s, closing the third closing auxiliary switch 13, and supplying power to the loop closing device by using the power supply so as to enable the loop closing device to be in a standby working state. At the simulation time 1s, the fourth closing auxiliary switch 14 is closed, that is, a loop closing operation is performed, and at this time, the first detection element 17 and the second detection element 18 have detected the voltage amplitude and the phase and induced a specific voltage difference. At the simulation time 2s, the first closing auxiliary switch 11 is turned off, so that the 1# bus and the first load 4 are disconnected, and at this time, a specific value of the internal resistance voltage drop of the loop closing device is shown in fig. 11, so that a data basis is provided for the subsequent setting voltage transformation ratio. And when the simulation moment is 3s, the loop closing device starts to carry out voltage regulation, a first regulation gear is set for 0.2s, after the voltage regulation is finished and stabilized for a period of time, the fifth closing auxiliary switch 15 is closed, the third closing auxiliary switch 13 and the fourth closing auxiliary switch 14 are disconnected, and finally the loop closing device is withdrawn to finish loop closing transfer. As can be seen from the partial enlarged view of the voltage waveform in the whole loop closing transfer process after the compensation voltage is increased in fig. 12, the compensation voltage is increased at the simulation time 2s, and the step-free change of the bus voltage can be obviously seen in fig. 12, which illustrates that the internal resistance voltage drop of the loop closing device is eliminated. Fig. 13 is a voltage waveform diagram of the whole process of loop closing transfer, in which the transformation ratio setting values of the corresponding adjustment quantities of the amplitude and the phase are determined after the compensation voltage is added, and it can be known from the adjustment process of the simulation time period from 3s to 4s in the diagram that in the process of loop closing transfer, the voltages before and after loop closing transfer are kept consistent through voltage adjustment for the duration of 1s, and in the process of loop closing transfer, the voltage changes slightly and the change amplitude is stable, so that the voltage quality is obviously improved.
Referring to fig. 14, embodiments of the present application provide a closed loop transfer regulated process power versus waveform diagram. As shown in fig. 14, Ps2 is the power generated by the second power supply 3 during the loop closing, transferring and adjusting process of the conventional phase-shifting transformer as the loop closing device, and Ps2im is the power generated by the second power supply during the loop closing, transferring and adjusting process of the phase-shifting transformer as the loop closing device and using the adjusting method provided by this application. It can be clearly seen from fig. 14 that the fluctuation amplitude of Ps2im is much smaller than that of Ps2, so as to illustrate that, when the phase-shifting transformer provided by the embodiment of the present application is used as a loop closing device and the adjusting method provided by the embodiment of the present application is used for loop closing transfer and adjustment, the power quality and the power supply reliability can be better ensured.
By utilizing the method provided by the embodiment of the application, the voltage constant amplitude value can be ensured when the power distribution network is subjected to loop closing transfer phase shifting operation through the flexible setting design of the transformation ratio of the loop closing device based on the phase shifting transformer, and the voltage quality and the power supply reliability of the load are ensured.
Claims (6)
1. A closed loop transfer supply adjusting method based on a phase-shifting transformer is characterized by comprising the following steps: the method comprises the following steps:
determining an adjustment requirement transformation ratio setting value of initial adjustment of the phase-shifting transformer;
acquiring a voltage difference between the loop closing device and a target regulating bus;
determining a compensation voltage and a compensation voltage transformation ratio setting value according to the adjustment demand transformation ratio setting value and the voltage difference;
determining the amplitude adjustment quantity and the phase adjustment quantity of the phase-shifting transformer after the compensation voltage is increased;
determining a corresponding phase adjustment transformation ratio setting value and an amplitude adjustment transformation ratio setting value according to the amplitude adjustment quantity and the phase adjustment quantity;
and adjusting a tapping tap of the phase-shifting transformer according to the phase adjustment variable ratio setting value and the amplitude adjustment variable ratio setting value.
2. The phase-shifting transformer-based loop-closing transfer supply adjusting method according to claim 1, wherein: and the setting of the adjustment demand transformation ratio setting value is obtained by the ratio of the voltage amplitude or voltage phase adjustment demand corresponding to each setting object to the primary winding input voltage of the excitation transformer.
3. The phase-shifting transformer-based loop-closing transfer supply adjusting method according to claim 1, wherein: the setting of the compensation voltage transformation ratio setting value is obtained by the ratio of a voltage difference value and the input voltage of the primary winding of the excitation transformer, wherein the voltage difference value is the voltage difference value between a loop closing device detected by the voltage detection element and a target adjusting bus after the voltage detection element exits from the power supply to be overhauled.
4. The phase-shifting transformer-based loop-closing transfer supply adjusting method according to claim 1, wherein: the setting design of the amplitude regulation transformation ratio setting value is according to a formula
Calculated, in the formula: k is a radical ofmIndicating the amplitude regulation transformation ratio setting, Δ VmRepresenting the amplitude adjustment requirement, kcIndicating the compensation voltage regulation transformation ratio setting value, VstShowing the voltage in the process of closed loop transfer supply adjustment, theta shows the initial voltage phase difference of the 1# bus and the 2# bus, and theta0The phase is adjusted in reverse for each gear.
5. The phase-shifting transformer-based loop-closing transfer supply adjusting method according to claim 1, wherein: the setting design of the phase regulation transformation ratio setting value is according to a formula
Calculated, in the formula: k is a radical ofpIndicating the phase-regulated ratio-of-set, Δ VpIndicating the phase adjustment demand, VstShowing the voltage in the process of closed loop transfer supply adjustment, theta shows the initial voltage phase difference of the 1# bus and the 2# bus, and theta0The phase is adjusted in reverse for each gear.
6. The phase-shifting transformer-based loop-closing transfer supply adjusting method according to claim 1, wherein: the adjustment requirement variable ratio setting value comprises an amplitude adjustment requirement variable ratio setting value and a phase adjustment requirement variable ratio setting value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111186738.8A CN113937779B (en) | 2021-10-12 | 2021-10-12 | Closed-loop supply switching and adjusting method based on phase-shifting transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111186738.8A CN113937779B (en) | 2021-10-12 | 2021-10-12 | Closed-loop supply switching and adjusting method based on phase-shifting transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113937779A true CN113937779A (en) | 2022-01-14 |
| CN113937779B CN113937779B (en) | 2024-06-14 |
Family
ID=79278236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111186738.8A Active CN113937779B (en) | 2021-10-12 | 2021-10-12 | Closed-loop supply switching and adjusting method based on phase-shifting transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113937779B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006050756A (en) * | 2004-08-03 | 2006-02-16 | Toshiba Corp | Power regulating unit |
| CN104821587A (en) * | 2015-05-19 | 2015-08-05 | 重庆大学 | Trajectory sensitivity method-based phase-shifting transformer phase angle adjusting method |
| CN107492891A (en) * | 2017-08-25 | 2017-12-19 | 国网安徽省电力公司安庆供电公司 | Movable-type intelligent ring device and its application method |
| CN111952970A (en) * | 2020-08-17 | 2020-11-17 | 云南电网有限责任公司电力科学研究院 | Power distribution network loop closing and power adjusting method and device |
-
2021
- 2021-10-12 CN CN202111186738.8A patent/CN113937779B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006050756A (en) * | 2004-08-03 | 2006-02-16 | Toshiba Corp | Power regulating unit |
| CN104821587A (en) * | 2015-05-19 | 2015-08-05 | 重庆大学 | Trajectory sensitivity method-based phase-shifting transformer phase angle adjusting method |
| CN107492891A (en) * | 2017-08-25 | 2017-12-19 | 国网安徽省电力公司安庆供电公司 | Movable-type intelligent ring device and its application method |
| CN111952970A (en) * | 2020-08-17 | 2020-11-17 | 云南电网有限责任公司电力科学研究院 | Power distribution network loop closing and power adjusting method and device |
Non-Patent Citations (1)
| Title |
|---|
| 江千军;桂前进;: "基于配电网的移动式智能合环装置研制与应用", 自动化应用, no. 09 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113937779B (en) | 2024-06-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2394356B1 (en) | A hybrid distribution transformer with ac&dc power capabilities | |
| CN103762599B (en) | Based on the transient impedance transformer of AC voltage adjusting electronic switch | |
| CN107294100B (en) | Flexible alternating-current interconnection device for power distribution network | |
| CN104167739A (en) | Four-bridge arm thyristor switch voltage-regulating circuit and voltage-regulating method | |
| CN111799831A (en) | Phase modulator and converter transformer on-load voltage regulation tap coordination control method and system | |
| CN101615806B (en) | Phase-control reactive power dynamic compensation device and compensation method thereof | |
| CN107612344A (en) | A kind of pressure equalizing control method of the combined DC/DC converters of ISOS | |
| Li et al. | A study on VSC-HVDC based black start compared with traditional black start | |
| CN113937779A (en) | Closed loop switching supply adjusting method based on phase-shifting transformer | |
| CN109217326B (en) | Step-down angular STATCOM and control method thereof | |
| RU2352010C2 (en) | Adjustable autotransformation reactor | |
| RU2467448C1 (en) | Capacitor plant for automatic compensation of reactive power | |
| CN113077979B (en) | Adjustable traction transformer structure for flexible through bilateral power supply system and balanced current suppression method | |
| CN113381423B (en) | Train ground automatic passing neutral section method and system capable of restraining electromagnetic transient process | |
| CN112821403B (en) | Single-phase or three-phase electromagnetic series type transmission line tidal current control topological circuit | |
| CN112928746B (en) | Self-adaptive segmented droop control method for direct-current microgrid converter | |
| CN112909912B (en) | Full compensation method and device for single-phase ground fault current of power distribution network | |
| Johal | Distributed Series Reactance: A new approach to realize grid power flow control | |
| CN201490720U (en) | Phased wattles power dynamic compensation device | |
| Xu et al. | Research on the Optimal Regulation Strategy of Loop Closing Device Based on Phase Shifting Transformer | |
| Mandal et al. | Solid State Power Substations for Future Power Grids | |
| CN113541145B (en) | 110kV and above voltage class three-phase electromagnetic series type transmission line current control topological circuit | |
| Wang | Power electronics assisted voltage regulators for modern distribution systems | |
| Liang et al. | An Improved Droop Control Method for Accurate Power Sharing and Bus Voltage Restoration in DC Microgrid | |
| Ge et al. | Flexible distribution network reconfiguration based on unified power flow controller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |