CN112821407B - Single-phase or three-phase electromagnetic series-type bidirectional voltage regulation topological circuit - Google Patents
Single-phase or three-phase electromagnetic series-type bidirectional voltage regulation topological circuit Download PDFInfo
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a single-phase or three-phase electromagnetic series-type bidirectional voltage regulation topological circuit, which belongs to the field of grid connection of distribution and utilization power grids and distributed power supplies. The multi-tap secondary coil is connected with the on-load voltage-regulating tap switch to form a secondary regulating winding, voltage conversion and power conversion between the primary winding and the secondary winding are realized through a closed iron core magnetic circuit, and the voltage increase, the voltage decrease and the polarity regulation of the secondary winding are performed through the selection of the on-load tap switch. The invention can solve the problem of low line terminal voltage caused by the length of the power supply and distribution line, and can also solve the problem of higher line terminal voltage caused by the high-permeability access of the distributed power supply, thereby realizing the effective control of the line terminal voltage.
Description
Technical Field
The invention belongs to the technical field of grid connection of a power distribution network and a distributed power supply, and particularly relates to the problem of out-of-limit (higher limit and lower limit) of terminal voltage of a power supply and distribution line caused by high permeability and long line access of the distributed power supply.
Background
Because distributed power is located in remote land parcels and even in barren mountains and barren lands, long-distance power supply and distribution lines are often required to transmit electric energy, along with continuous improvement of the permeability of the distributed power, power feedback in daytime causes voltage lifting at the tail ends of the distribution lines, and the voltage exceeds the upper limit of the power supply voltage, so that damage is caused to power equipment of the tail ends and users along the line. The voltage of the outlet end of the transformer substation is simply and underground regulated, so that the voltage of the tail end of the power supply and distribution line is not higher than the upper limit during the power back transmission in daytime, and the voltage of the tail end of the power supply and distribution line at night is lower than the lower limit, namely, the voltage at the tail end of the power supply and distribution line at a longer distance and along the line has great day and night deviation change under the high permeability of the distributed power supply, and the allowable deviation range of the power supply voltage is exceeded.
The method for improving the capacity of the circuit can reduce the voltage lifting degree of the tail end and the voltage along the line, but the construction period is long, and the power supply to the power users along the line is affected. Meanwhile, the electric power cable and engineering construction cost is high, the recovery period is long, and the investment benefit is low. In addition, the trend calculation analysis shows that even after the line is compatibilized and transformed, the phenomenon that the terminal voltage of the power supply and distribution line is higher still exists, and the problem of the power distribution network on the high-permeability distributed power supply can not be completely solved.
The traditional method for improving the voltage level by using reactive compensation modes such as a parallel capacitor or an inductor is not obvious in voltage regulation effect on the high-power-factor line.
The method for regulating the voltage of the grid-connected point by adopting the multiplexing mode of generating the active power and absorbing the reactive power by the new energy power generation unit is also known as a reactive power self-adaptive voltage control technology of a reverse control integrated machine, and has a certain voltage regulating effect when the output of the distributed power inverter is lighter. But taking into account the resistive characteristics of the medium and low voltage lines (longitudinal component DeltaU of the rise in terminal voltage 2 ＝(PR-QX)/U 2 Transverse component δU 2 ＝(PX+QR)/U 2 ) The method comprises the following steps: when the resistive sense line is operated at a high power factor, the line end voltage rise (or drop) is primarily a component of the resistive voltage drop. When the output of the photovoltaic inverter is high, the reactive residual capacity of the inverter is low, the voltage regulating capability is weak, and at the moment, the active output is limited and inductive reactive is increased in a deep light discarding mode to ensure that the voltage does not exceed the upper limit. Considering the factors of long duration (for example, 10:00-14:30), high-resistance inductive circuit, high-proportion photovoltaic access and the like of light Fu Gao, the voltage regulation mode can lead to long-time large-scale light rejection, the power generation benefit is reduced, and the line loss can be obviously increased due to higher circuit reactive power.
Because the power electronic switch is flexible to control, convenient and accurate to modulate, when the power flow control device (UPFC) adopting the pure electric electronic technology is adopted, the problem of overhigh voltage at a grid connection point can be solved to a certain extent, but the pure electric electronic system has small heat capacity, poor tolerance, weak shock resistance and high cost, and is difficult to adapt to the natural environment of thunderstorm and snow disasters, severe summer and severe cold, complicated load properties and other conditions faced by a power distribution network and a power distribution line.
The Thyristor Controlled Series Compensation (TCSC) device still belongs to a mode of adjusting the reactance of the line, can compensate the reactance voltage component of the line, is suitable for voltage adjustment of a high-voltage line (belonging to high inductance, small line resistance and even negligible line resistance), but is not suitable for voltage adjustment of a medium-voltage line and a low-voltage line (belonging to high inductance and even high resistance, and not negligible line resistance).
The transformation ratio can be changed by adopting a conventional on-load voltage regulating transformer through the control of an on-load tap changer, and the secondary voltage can be regulated, but the voltage regulator belongs to a cascading structure, the capacity of the voltage regulator is required to be more than or equal to the total capacity of an regulated object, and the equipment input cost is correspondingly increased. In addition, although the transformer of the newly-built new energy power station can solve the problem of high voltage, the high voltage problem of power users around the line still cannot be solved.
The secondary voltage can be regulated by adopting a conventional autotransformer, but the voltage regulator still belongs to a cascading structure, and the capacity of the voltage regulator is more than or equal to the total capacity of an regulated object, so that the input cost of equipment is correspondingly increased.
The conventional induction voltage regulator can also be used for changing the line voltage when being connected into a line in series by adjusting the phase of the secondary voltage, but when the line ring network supplies power, ring network circulation can be caused, and potential safety hazards are brought.
Therefore, it is necessary to develop a single-phase or three-phase voltage regulating circuit which is particularly robust, highly reliable and low-cost, and which solves the problem of out-of-limit (higher limit and lower limit) of the voltage at the end of the distribution and supply lines.
Disclosure of Invention
The invention aims at providing a single-phase or three-phase electromagnetic series-type bidirectional voltage regulation topological circuit, which is characterized by mainly comprising a closed iron core magnetic circuit, a primary winding, a multi-tap secondary winding and an on-load voltage regulation tapping switch, wherein the single-phase or three-phase electromagnetic series-type bidirectional voltage regulation topological circuit can be divided into a single-phase electromagnetic series-type bidirectional voltage regulation circuit and a three-phase electromagnetic series-type bidirectional voltage regulation circuit when the single-phase or three-phase electromagnetic series-type bidirectional voltage regulation topological circuit is applied specifically.
The single-phase or three-phase electromagnetic series bidirectional voltage regulation topological circuit is characterized in that a closed iron core magnetic circuit realizes voltage-current conversion and power energy transfer between a primary winding and a multi-tap secondary winding, establishes voltage phasors between taps of the secondary winding, and then regulates the voltage and the polarity of the secondary winding through an on-load tap switch.
The single-phase electromagnetic series-connection type bidirectional voltage regulating circuit is characterized in that a closed iron core magnetic circuit of an iron core 1 of the single-phase voltage regulating circuit realizes power conversion between a serial voltage regulating winding 3 of the single-phase voltage regulating circuit and an energy-taking winding 2 of the single-phase voltage regulating circuit in parallel, a head end A and a tail end X of the energy-taking winding 2 of the single-phase voltage regulating circuit are respectively connected to a live wire and a zero wire of a power supply circuit in parallel, and the head end of the serial voltage regulating winding 3 of the single-phase voltage regulating circuit is connected with an input end A through an on-load voltage regulating tap switch 4 1 The single-phase voltage regulating circuit is connected with the tail end of the voltage regulating winding 3 and the output end A in series 2 The head end A of the parallel energy-taking winding 2 of the single-phase voltage regulating circuit and the tail end of the serial voltage regulating winding 3 of the single-phase voltage regulating circuit are connected into a common end in the equipment to serve as an output end A of the bidirectional voltage self-adaptive regulating device of the single-phase electromagnetic series transmission line, which is externally connected 2 The device is used for connecting with a load side live wire input end; compared with the existing on-load voltage regulating transformer, the capacity of the single-phase or three-phase electromagnetic series bidirectional voltage regulating topological circuit related to the invention only needs to be 10 to 20 percent of the capacity of the single-phase or three-phase on-load voltage regulating transformer in order to achieve the same voltage regulating effect.
The three-phase electromagnetic series bidirectional voltage regulating circuit is characterized in that the on-load tap numbers (1) to (7) led out by the on-load tap changer 901 of the A phase are connected with the midpoint position (namely, the on-load tap (4)) of the on-load tap changer 801 of the A phase in parallel energy-obtaining winding 701 to form a common point A, and meanwhile, the output end A of the on-load tap changer 701 connected to the outside is led out from the common point A 2 And a load tap (4); the on-load tap numbers (1) to (7) led out by the B-phase on-load voltage regulating tap changer 902 are the head end B of the B-phase parallel energy taking winding 702Is connected with the midpoint position (i.e. the on-load tap (4)) of the B-phase series voltage-regulating winding 802 to form a common point B, and simultaneously, an output end B of the B-phase series voltage-regulating winding 802 which is externally connected is led out from the common point B 2 And a load tap (4); the on-load tap numbers (1) to (7) led out by the on-load tap changer 903 of the C phase are connected with the midpoint position (i.e. the on-load tap (4)) of the C phase serial voltage regulating winding 803 at the head end C of the C phase parallel energy collecting winding 703 to form a common point C, and meanwhile, the output end C of the C phase serial voltage regulating winding 803 connected to the outside is led out from the common point C 2 And the on-load tap (4), so that the A-phase serial voltage regulating winding 801, the B-phase serial voltage regulating winding 802 and the B-phase serial voltage regulating winding 803 obtain a bidirectional voltage regulating range with the same three-phase high and low voltage regulation.
The single-phase or three-phase electromagnetic series-type bidirectional voltage regulating topological circuit is characterized in that a primary winding is connected to a power supply and distribution line in parallel, a multi-tap secondary winding is connected to the power supply and distribution line in series, the electric position of the single-phase or three-phase electromagnetic series-type bidirectional voltage regulating topological circuit is positioned between the power supply and distribution line and an object to be regulated, taps of the single-phase or three-phase voltage regulating winding are controlled by an on-load tap switch to select, the amplitude and the positive and negative polarities of the voltage connected to the line in series are changed, bidirectional regulation of the line terminal voltage is realized, and the problem of terminal voltage out-of-limit (higher limit and lower limit) caused by high permeability of a distributed power supply or long line access is solved.
The single-phase or three-phase electromagnetic series bidirectional voltage regulation topological circuit selects the tap of the single-phase or three-phase voltage regulation winding through the control of the on-load voltage regulation tap switch so as to solve the problem that the terminal voltage of a long power supply and distribution line is out of limit (higher limit and lower limit) caused by overlarge power supply radius and high-proportion access of new energy.
The problem of power supply and distribution line terminal voltage out-of-limit caused by long line access is mainly caused by large power supply radius, when the terminal power load current is large, the line voltage drop causes the terminal load voltage to be lower, and if the voltage deviation index exceeds the lower limit, the requirement of boost regulation exists. When the power generation output of the terminal distributed power supply is large, the voltage difference of the circuit causes the terminal voltage to be higher, and if the voltage deviation index exceeds the upper limit, the voltage reduction regulation is required; the tap of the single-phase or three-phase voltage regulating coil is selected by the on-load tap-changer control.
The technical scheme provided by the invention is summarized as follows: a single-phase or three-phase electromagnetic series-type bidirectional voltage regulation topology circuit scheme at the end of a line based on the electromagnetic induction principle and on-load tap-changer control. The energy-taking winding of the single-phase or three-phase electromagnetic series-type bidirectional voltage regulation topological circuit is connected in parallel between a live wire and a neutral point (or a neutral line) of the single-phase or three-phase circuit, the single-phase or three-phase voltage regulation coil is connected in series into the corresponding circuit of each phase, then the tap of the single-phase or three-phase voltage regulation winding is controlled by the on-load voltage regulation tap switch to select, the voltage amplitude and the positive and negative polarities of the voltage connected in series on the circuit can be changed, thereby realizing the regulation of the voltage at the tail end (or the rear section) of the circuit and solving the problem of out-of-limit (higher limit and lower limit) of the tail end voltage caused by the high permeability of a distributed power supply or the connection of a long circuit.
The beneficial effects of the invention are as follows:
1) Compared with the existing cascade on-load voltage regulating transformer voltage regulating circuit, the capacity of the single-phase or three-phase electromagnetic series on-load voltage regulating topological circuit provided by the invention is only 10 to 20 percent of the capacity of the cascade on-load voltage regulating transformer or an autotransformer and the like, so that the same voltage regulating effect is achieved.
2) Compared with the voltage regulating topological circuit of the pure electric electronic technology, the single-phase or three-phase electromagnetic series type bidirectional voltage regulating topological circuit provided by the invention has the advantages of large heat capacity, strong shock resistance, good durability, high reliability and better economic cost, and is more suitable for natural environments of thunderstorm wind disasters and severe summer and severe cold faced by a power distribution network and a power distribution line, complicated power load properties, behaviors and the like.
3) Compared with a controllable series compensation (TCSC) type voltage regulating topological circuit, the single-phase or three-phase electromagnetic series bidirectional voltage regulating topological circuit provided by the invention is more suitable for voltage regulation of medium-voltage and low-voltage inductive and even high-resistance distribution lines.
4) Compared with a reverse control integrated machine type voltage regulating topological circuit, the single-phase or three-phase electromagnetic series type bidirectional voltage regulating topological circuit provided by the invention has stronger voltage regulating capability, is more suitable for occasions such as high output, long circuit, high resistance and high permeability access of a distributed power supply, realizes complete absorption of the high permeability distributed power supply, does not reduce the power factor of an access point, and does not increase line loss.
5) The single-phase or three-phase electromagnetic series-type bidirectional voltage regulation topological circuit is suitable for oil immersed or dry type structures, is suitable for regulating the voltages of the tail ends (or rear sections) of overhead lines and cable lines of all alternating-current voltage classes, and is also suitable for controlling the power flow power of the overhead lines and cable lines of all alternating-current voltage classes.
6) The single-phase or three-phase electromagnetic series bidirectional voltage regulation topological circuit provided by the invention has the advantages that the number of taps in the on-load voltage regulation tap switch 4 and the on-load voltage regulation tap switches 901, 902 and 903 can be arbitrarily configured according to actual requirements, if the regulation precision requirement is high, the number of taps can be increased, and if the regulation precision requirement is not high, the number of taps can be reduced so as to control the whole volume, weight and cost of the device.
Drawings
Fig. 1 is a schematic diagram of a single-phase electromagnetic series-type bidirectional voltage regulation topology.
Fig. 2 is a schematic diagram of a three-phase electromagnetic series-type bidirectional voltage regulation topology.
Fig. 3 is a schematic diagram of the electrical principle of a single-phase electromagnetic series-type bidirectional voltage regulation topology.
Fig. 4 is an electrical wiring schematic diagram of a single-phase electromagnetic series-type bidirectional voltage regulation topology.
Fig. 5 is a schematic diagram of the electrical principle of a three-phase electromagnetic series-type bidirectional voltage regulation topology.
Fig. 6 is an electrical wiring schematic diagram of a three-phase electromagnetic series bi-directional voltage regulation topology.
Detailed Description
The invention provides a single-phase or three-phase electromagnetic series-type bidirectional voltage regulation topological circuit, which is used for carrying out voltage-current conversion and power electric energy transmission according to the principle of electromagnetic induction and is connected in parallel and in series to form a single-phase or three-phase series-type voltage regulator topological circuit; the single-phase or three-phase electromagnetic series bidirectional voltage regulation topological circuit is characterized in that an energy-taking winding and a voltage regulation winding are arranged on a closed iron core magnetic circuit; an on-load tap-changer is connected in series between the energy taking winding and the voltage regulating winding so as to perform power conversion; the single-phase or three-phase voltage regulating coils are connected in series into corresponding phase lines, and then the on-load tap of the single-phase or three-phase voltage regulating coils is controlled by the on-load tap switch to select the on-load tap of the single-phase or three-phase voltage regulating coils, so that the amplitude and the positive and negative polarities of the voltage connected in series on the lines can be changed. Thereby realizing the regulation of the line terminal voltage; the voltage is regulated in a grading manner, positive polarity control and negative polarity control are realized, single-phase or three-phase voltage rising and dropping regulation at the tail end of the line is realized, the problem of terminal voltage out-of-limit caused by high permeability of the distributed power supply and long-line access is solved, and further the power distribution network is ensured to absorb the high-permeability distributed power supply.
The single-phase or three-phase electromagnetic series bidirectional voltage regulation topological circuit is connected between a power supply line and an object to be regulated, namely, is positioned at the tail end of the line and at the front end of a distribution transformer of the object to be regulated, and is suitable for distribution transformer areas with larger power supply radius of the distribution line, distributed power stations and combination occasions of any capacity ratio of the distribution transformer areas and the distributed power sources. Because the distribution line is long and the power supply radius is large, when the power load current of the terminal distribution transformer area is large, the voltage drop of the line leads to lower terminal load voltage, and if the voltage deviation index exceeds the lower limit, the requirement of boosting regulation exists; when the power generation output of the terminal distributed power station is large, the terminal voltage of the line is raised to cause the terminal voltage to be higher, and if the voltage deviation index exceeds the upper limit, the voltage reduction regulation is required.
The following is a detailed description of embodiments with reference to the accompanying drawings:
example 1: single-phase electromagnetic series-type bidirectional voltage regulation topological circuit
FIG. 1 is a schematic illustration of a typeSingle-phase electromagnetic series bidirectional voltage regulation topological circuit schematic diagram and power distribution system equivalent power supplyThrough a transformer T 1 Voltage when single-phase power supply is obtained +.>Taking phase A as an example, a single-phase power supply>Via-supply-line impedance R 2l +jX 2l Input end A of two-way voltage regulating circuit connected with single-phase electromagnetic series 1 Output end A of single-phase electromagnetic series-type bidirectional voltage regulating circuit 2 And transformer T 2 Connected to transformer T 2 Secondary side connection common point (PCC point)/(PCC point)>The PCC points are respectively connected with a distributed power supply and a load, and the distributed power supply transmits energy P DG +jQ DG Load side absorbed energy P L +jQ L 。
Fig. 3 is an electrical schematic diagram of a single-phase electromagnetic series bidirectional voltage regulation topology circuit, in which a single-phase voltage regulator iron core 1 implements power conversion between a parallel energy-taking winding 2 and a series voltage regulation winding 3 through a closed iron core magnetic circuit, and a head end a and a tail end X of the parallel energy-taking winding 2 are respectively connected in parallel to a live wire and a zero wire of a power supply circuit; head end A of series voltage regulating winding 3 1 For connecting an external input end, in practical application, the tail end of the series voltage regulating winding 3 and the head end A of the parallel energy taking winding 2 are connected into a common end in the device to serve as an output end A connected to the outside 2 The device is used for connecting a load side live wire input end in practical application.
Fig. 4 is an electrical wiring schematic diagram of a single-phase electromagnetic series bi-directional voltage regulation topology, illustrated as follows with a 7-tap regulator coil. Series voltage regulating winding3 are respectively (1) to (7), the head end A of the parallel energy-taking winding 2 is connected with the midpoint position of the series voltage-regulating winding 3 (namely, the position of the on-load tap (4)) to form a common point, and meanwhile, the output end A of the series voltage-regulating winding 3 which is externally connected is led out from the common point 2 And a load tap (4) which, for the regulation winding, can form a regulation range in which the high and low voltages are regulated; if the range requirements for high and low voltage regulation are different, for example: the voltage reduction amplitude of the voltage regulating winding is required to be larger, the voltage increase amplitude is smaller, the common terminal is adjusted in the direction of increasing the tap number, otherwise, the common terminal is adjusted in the direction of decreasing the tap number; if only single buck regulation is required, the common terminal is connected with the on-load tap number (7), and if single boost regulation is required, the common terminal is connected with the on-load tap number (1). Each on-load tap (1) to (7) of the regulating coil is correspondingly connected to the on-load tap (1) to (7) of the 7-gear single-phase on-load voltage regulating tap switch 4 through a conductor, and the common end (8) of the single-phase on-load voltage regulating tap switch 4 is used as an input end A of the single-phase voltage regulating winding 1 The input terminal A 1 Output terminal A of series voltage regulating winding 3 2 A single-phase series voltage regulating winding 3 which can be connected in series with the front end of the object to be regulated is formed. When the common terminal (8) of the single-phase on-load voltage regulating tapping switch 4 is connected to the position of the on-load tap (1), the single-phase serial voltage regulating winding 3A 1 A 2 The voltage at two ends is the voltage difference between the load taps (1) and (4) of the voltage regulating coil, according to the homonymous end relation between the parallel energy-taking winding 2 and the series voltage regulating winding 3,when looking at the terminal power consumer along the power supply line, the voltage reduction regulation is equivalent to the regulation scene when the terminal power consumer voltage is higher. When the common terminal (8) of the single-phase on-load voltage regulating tapping switch 4 is connected to the position of the on-load tap (7), the single-phase serial voltage regulating winding 3A 1 A 2 The voltage at two ends is the voltage difference between the on-load tap joints (7) and (4) of the voltage regulating coil, and the>When looking at the terminal power consumer along the power supply line, the voltage boost regulation is equivalent to the regulation scene when terminal power consumer voltage is low. When the common terminal (8) of the single-phase on-load voltage regulating tapping switch 4 is connected to the position of the on-load tap (4), the single-phase serial voltage regulating winding 3A 1 A 2 The voltage difference between the two ends is zero, and the time when the voltage of the terminal power user is qualified is met.
Example 2: three-phase electromagnetic series-type bidirectional voltage regulation topological circuit
FIG. 2 is a schematic diagram of a three-phase electromagnetic series-type bidirectional voltage regulation topology, equivalent power supply for a power distribution systemThrough a transformer T 1 Obtaining three-phase power supply +.>Via-supply-line impedance R l +jX l Is connected with the input end of the three-phase electromagnetic series-type bidirectional voltage regulating circuit, and the output end of the three-phase electromagnetic series-type bidirectional voltage regulating circuit is connected with the transformer T 2 Connected to transformer T 2 Secondary side connection common point (PCC point)/(PCC point)>The PCC points are respectively connected with a distributed power supply and a load, and the distributed power supply transmits energy P DG +jQ DG Load side absorbed energy P L +jQ L 。
Fig. 5 is a schematic connection of a three-phase electromagnetic series bidirectional voltage regulation topology circuit, as shown, and a closed core magnetic circuit 6 realizes power conversion between a three-phase parallel energy-taking winding 7 and a three-phase series voltage regulation winding 8. The head ends A, B, C of all phase windings of the three-phase parallel energy-taking winding 7 are respectively connected to the live wire of the distribution line in parallel, the tail ends X, Y, Z of all phase windings are intersected to be a neutral point N, star-shaped wiring of the three-phase parallel energy-taking winding is realized, and the three-phase parallel energy-taking winding is also connectedThe three-phase parallel energy-taking winding can adopt angle-shaped wiring according to the requirements of application occasions, even in order to meet the requirements of certain special application occasions, the three-phase energy-taking winding 7 can also adopt connection groups with other points for wiring, and the head end A of the three-phase serial voltage-regulating winding 8 1 、B 1 、C 1 In order to connect the external input end, in practical application, the tail end of the three-phase serial voltage regulating winding 8 is firstly connected with the head end A, B, C of the three-phase parallel energy-taking winding 7 to form a common end in the equipment, and is used as the three-phase output end A connected to the outside 2 、B 2 、C 2 In practical application, the input end of each live wire on the load side is connected.
Fig. 6 is an electrical wiring schematic diagram of a three-phase electromagnetic series bi-directional voltage regulation topology. Taking a phase a 7 tap containing conditioning coil as an example, the following is illustrated: the serial numbers of the loaded tap points led out by the A-phase serial voltage regulating winding 801 are (1) to (7), the head end A of the A-phase serial energy-collecting winding 701 is connected with the midpoint position of the serial voltage regulating winding 801 (namely, the loaded tap point (4) of the A-phase serial voltage regulating winding 801) to form a common point, and meanwhile, the output end A externally connected by the A-phase serial voltage regulating winding 801 is led out from the common point 2 And an on-load tap (4) of the A-phase series voltage regulating winding 801, and for the A-phase series voltage regulating winding, the regulation of the high and low voltage ranges is realized. If the range requirements for high and low voltage regulation are different, for example: the voltage reduction amplitude of the voltage regulating winding is required to be larger, the voltage increase amplitude is smaller, the common terminal is adjusted in the direction of increasing the tap number, otherwise, the common terminal is adjusted in the direction of decreasing the tap number; if only single buck regulation is required, the common terminal is connected with the load tap number (7), and if single boost regulation is required, the common terminal is connected with the load tap number (1). Each on-load tap (1) to (7) of the a-phase series voltage-regulating winding 801 is correspondingly connected to the on-load tap (1) to (7) of the 7-gear a-phase on-load voltage-regulating tap switch 901 through a conductor, and the common end (8) of the a-phase on-load voltage-regulating tap switch 901 is used as the input end a of the a-phase series voltage-regulating winding 801 1 The input terminal A 1 Output end A of voltage regulating winding 801 connected in series with A phase 2 A phase winding port A forming three-phase series voltage regulating winding 8 1 A 2 . When the common terminal (8) of the A-phase on-load tap changer 901 is connected to the position of the on-load tap (1), the A-phase voltage-regulating winding 801 is connected in series with the A-phase 1 A 2 The voltage at two ends is the voltage difference between the load taps (1) and (4) of the A-phase voltage regulating coil, and according to the homonymous end relationship between the A-phase parallel energy-taking winding 701 and the A-phase serial voltage regulating winding 801, the voltage of the two ends is knownI.e. looking along the supply line towards the end power consumer, corresponds to a step-down regulation, which is suitable for a regulation scenario when the voltage of the end power consumer is too high. When the common terminal (8) of the A-phase on-load tap changer 901 is connected to the position of the on-load tap (7), the A-phase voltage-regulating winding 801 is connected in series with the A-phase 1 A 2 The voltage at two ends is the voltage difference between the load taps (7) and (4) of the voltage regulating coil, and according to the homonymous end relationship between the A-phase parallel energy-taking winding 701 and the A-phase serial voltage regulating winding 801, the ∈10 can be known>I.e. looking along the supply line towards the end power consumer, corresponds to boost regulation, which is suitable for regulation scenarios when the voltage of the end power consumer is low. When the common terminal (8) of the A-phase on-load tap changer 901 is connected to the position of the on-load tap (4), the A-phase voltage-regulating winding 801 is connected in series with the A-phase 1 A 2 The voltage difference between the two ends is zero, and the condition that the voltage of the terminal power user is qualified and does not need to be regulated is met.
B, C phase voltage regulating windings in the three-phase serial voltage regulating windings in the three-phase electromagnetic serial bidirectional voltage regulating topological circuit have the same electrical wiring detail as A phase serial voltage regulating windings, and the common end (8) of the B phase on-load voltage regulating tap switch 902 is used as an input end B of the B phase serial voltage regulating windings 802 1 The input terminal B 1 Output terminal B of voltage regulating winding 802 in series with phase B 2 B-phase winding port B for forming three-phase series voltage regulating winding 8 1 B 2 The common terminal (8) of the C-phase on-load tap changer 903 is used as the input terminal C of the C-phase series voltage regulating winding 803 1 The input end C 1 Output terminal C of voltage regulating winding 803 in series with C phase 2 C-phase winding port C for forming three-phase series voltage regulating winding 8 1 C 2 I.e. A 1 A 2 、B 1 B 2 、C 1 C 2 Each constituting a A, B, C phase winding of the three-phase series voltage regulating winding 8. The tail end X of the phase A parallel energy-taking winding 701 and the tail end Y of the phase B parallel energy-taking winding 702 and the tail end Z of the phase C parallel energy-taking winding 703 are connected at a common point N to serve as neutral points of the three-phase parallel energy-taking winding 7, so that the three-phase parallel energy-taking winding 7 is formed.
Claims (1)
1. The single-phase or three-phase electromagnetic series-type bidirectional voltage regulation topological circuit is characterized by mainly comprising a closed iron core magnetic circuit, a parallel energy-taking winding, a series voltage-regulating winding and an on-load voltage-regulating tap switch, wherein the single-phase or three-phase electromagnetic series-type bidirectional voltage regulation topological circuit realizes voltage-current conversion and power energy transfer between the parallel energy-taking winding and the series voltage-regulating winding through the closed iron core magnetic circuit;
the head end and the tail end of the parallel energy-taking winding are respectively connected to a live wire and a zero wire of a power supply circuit, the series voltage-regulating winding is connected in series into corresponding phase circuits, the input end of the series voltage-regulating winding is a single-phase or three-phase electromagnetic series bidirectional voltage-regulating circuit which is connected with an external input end, and the input end of the series voltage-regulating winding is used for being connected with a live wire output end of a power supply side in practical application;
the serial voltage regulating winding is provided with a plurality of on-load tap points, the serial numbers of the on-load tap points of the serial voltage regulating winding are arranged from low to high, the on-load voltage regulating tap switch is provided with a plurality of on-load tap points, the serial numbers of the on-load tap points of the on-load voltage regulating tap switch are arranged from low to high, and the number of the on-load tap points of the serial voltage regulating winding is the same as the number of the on-load tap points of the on-load voltage regulating tap switch;
the head end of the parallel energy-taking winding is connected with a certain position in the series voltage-regulating winding to form a common point, the output end of the series voltage-regulating winding, which is externally connected, is led out from the common point, and the output end of the series voltage-regulating winding, which is externally connected, is used for connecting the input end of the load side live wire in practical application;
when the common point is positioned at the on-load tap with the serial number of the serial voltage regulating winding being the middle position, the serial voltage regulating winding has the same regulating range of rising and falling, or when the common point is regulated in the direction of reducing or increasing the serial number of the on-load tap of the serial voltage regulating winding, the serial voltage regulating winding has different regulating ranges of rising and falling;
the serial number of the serial voltage regulating winding is correspondingly connected to the on-load tap changer from low to high through the conductor, and the common end of the on-load voltage regulating tap changer is used as the input end of the serial voltage regulating winding;
the amplitude and the positive and negative polarities of voltages at two ends of the series voltage regulating winding are changed by changing an on-load tap of the on-load voltage regulating tap switch connected with a public end of the on-load voltage regulating tap switch;
the number of on-load taps of the on-load voltage regulating tap-changer and the number of on-load taps of the series voltage regulating winding are arbitrarily configured according to actual requirements, if the requirement on the regulating precision is high, the number of on-load taps is increased, and if the requirement on the regulating precision is not high, the number of on-load taps is reduced.
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