CN112003289A - Power distribution network undervoltage automatic compensation method and device based on bilateral multi-tap transformer - Google Patents
Power distribution network undervoltage automatic compensation method and device based on bilateral multi-tap transformer Download PDFInfo
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- CN112003289A CN112003289A CN202010871101.1A CN202010871101A CN112003289A CN 112003289 A CN112003289 A CN 112003289A CN 202010871101 A CN202010871101 A CN 202010871101A CN 112003289 A CN112003289 A CN 112003289A
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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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Abstract
The invention relates to a distribution network undervoltage automatic compensation method and device based on a bilateral multi-tap transformer, the method automatically selects the combined transformation ratio gear of the primary and secondary taps of the bilateral multi-tap transformer to compensate the corresponding drop voltage through the device, and ensures that when the voltage of a distribution network is reduced, the voltage at the load side still meets the national voltage quality standard formulated by the national technical committee for voltage, current and frequency standardization (TC 1); the device comprises a tap selection module K1-K7, a primary side T2 of the double-side multi-tap transformer, a secondary side T1 of the double-side multi-tap transformer and an automatic control unit; the existing dynamic voltage compensator is limited by the capacity of an energy storage element, the device is complex, the compensation cost is higher, and the invention has the beneficial effects that: the compensation voltage is more stable, the device is simple in structure and is not limited by the capacity of an energy storage element, and compared with the original and secondary side combined transformation ratio compensation voltage of the double-side multi-tap transformer in the patent CN201810468380, the primary and secondary side combined transformation ratio compensation voltage of the transformer prevents the voltage breakdown caused by the overlarge primary turn ratio of the transformer.
Description
Technical Field
The invention relates to the technical field of distribution network under-voltage compensation, in particular to a distribution network under-voltage automatic compensation method and device based on a bilateral multi-tap transformer.
Background
In modern power systems, due to the influence of factors such as natural disasters, the voltage quality of a power grid is often reduced, wherein voltage drop is one of the most serious power quality problems at present, and the reduction of the voltage quality of the power grid causes great loss to a user side.
In the prior art, the dynamic voltage compensator is the most effective compensation mode in the current market, but the current dynamic voltage compensator is limited by the capacity of the energy storage element, when the voltage drop is large, the effect of performing the undervoltage compensation by using the dynamic voltage compensator is not ideal, the structure of the device is complex, and the compensation cost is high. The conventional multi-tap transformer voltage compensation device has a large primary side turn ratio, so that the voltage breakdown possibility exists.
Disclosure of Invention
The invention aims to solve the technical problems and provides a method and a device for automatically compensating the undervoltage of a power distribution network based on a bilateral multi-tap transformer. The device comprises: tap selection modules K1-K7; the secondary side T1 of the double-side multi-tap transformer is provided with two taps which are connected in series between a power supply and a load, the homonymous end is connected with the tap selection module, and the heteronymous end is connected with the output side of the load; the primary side T2 of the double-side multi-tap transformer is provided with 5 taps which are connected in parallel on a power supply, the different name end is connected with the tap selection module, and the same name end is connected with the input side of a load; and the automatic control unit is connected with each tap selection module and is used for controlling the on-off of the tap selection module. The method automatically selects the combined transformation ratio gear of the primary and secondary taps of the double-side multi-tap transformer to compensate the corresponding drop voltage through the device, and ensures that when the voltage of the distribution network is reduced, the voltage of the load side still meets the national voltage quality standard formulated by the national technical committee on voltage, current and frequency standardization (TC 1).
In the scheme of the invention, the tap selection modules K1-K7 are respectively connected with the corresponding numbered taps of the double-side multi-tap transformer. By selecting different taps on the primary side and the secondary side of the double-side multi-tap transformer, the double-side multi-tap transformer can provide voltages with different amplitudes for the load, and the voltage on the load side can still meet the national voltage quality standard formulated by the national technical committee on voltage and current classes and frequency standardization (TC1) when the voltage of the power distribution network is reduced. The required coil turn ratio of the double-side multi-tap transformer is calculated by formula
Is determined in which，vL(t) voltage required by load, vs(t) is the real-time supply voltage,
the turn ratio of the double-side multi-tap transformer is adopted. The tap selection module is connected with the corresponding tap selection module, and the combination turn ratio of the original side and the secondary side of the double-side multi-tap transformer is adjusted substantially, so that the proper turn ratio is calculated through the formula, and then the tap selection module corresponding to the turn ratio is selected, and the under-voltage compensation function of the invention can be realized. When the voltage drops to 5%, 15%, 25%, 35%, 45% and 55%, respectively, the original secondary side combination transformation ratio preset table of the double-side multi-tap transformer for compensating the corresponding voltage drop is as follows:
in the scheme of the invention, when the voltage drops, the specific steps of controlling the tap selection module to be switched off by the automatic control unit are as follows: (1) when the voltage does not drop: switch K1 is closed and the rest are open; (2) when the voltage drops by 5%: switches K1, K3 are closed, and the rest are open; (3) when the voltage drops by 15%: switches K2, K3 are closed, and the rest are open; (4) when the voltage drops by 25%: switches K2, K4 are closed, and the rest are open; (5) when the voltage drops by 35%: switches K2, K5 are closed, and the rest are open; (6) when the voltage drops by 45%: switches K2, K6 are closed, and the rest are open; (7) when the voltage drops by 55%: switches K2, K7 are closed, and the rest are open.
In the scheme of the invention, the device automatically selects the combined transformation ratio gear of the primary and secondary taps of the double-side multi-tap transformer to compensate the corresponding drop voltage, so that when the voltage of the distribution network is reduced, the voltage of the load side still meets the national voltage quality standard formulated by the national technical committee for voltage and current grades and frequency standardization (TC 1). In the scheme of the invention, the preset specified voltage range of each gear can be flexibly adjusted according to actual conditions, and the preferable range is within +/-5% of the national standard value of the voltage deviation amplitude corresponding to the rated voltage.
Advantageous effects
The invention provides a method and a device for automatically compensating undervoltage of a power distribution network based on a bilateral multi-tap transformer. Compared with the original and secondary side combined transformation ratio compensation voltages of the double-side multi-tap transformer in the patent of CN201810468380.X, the invention prevents the possibility of voltage breakdown caused by overlarge primary turn ratio of the transformer, and reduces the insulation grade of the transformer.
Drawings
Fig. 1 is a schematic diagram illustrating the principle of a method and an apparatus for automatically compensating for an undervoltage of a power distribution network based on a bilateral multi-tap transformer according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating simulation results of a main circuit of the device when the voltage drops to 50% according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of an automatic control module of a method and an apparatus for automatic compensation of under-voltage of a power distribution network based on a bilateral multi-tap transformer according to an embodiment of the present invention
Detailed Description
In order to facilitate an understanding of the present invention, reference will now be made to the following detailed description. As shown in fig. 1, in the figure: the automatic control system comprises a 1-double-side multi-tap transformer secondary side T1, a 2-double-side multi-tap transformer primary side T2 and 3-tap selection modules K1-K7, wherein an automatic control unit is connected with the tap selection modules, a 4-power supply and a 5-load. The embodiment of the invention provides a method and a device for automatically compensating undervoltage of a power distribution network based on a bilateral multi-tap transformer, wherein the device comprises the following steps: tap selection modules K1-K7; the secondary side T1 of the double-side multi-tap transformer is provided with two taps which are connected in series between a power supply and a load, the homonymous end is connected with the tap selection module, and the heteronymous end is connected with the output side of the load; the primary side T2 of the double-side multi-tap transformer is provided with 5 taps which are connected in parallel on a power supply, the different name end is connected with the tap selection module, and the same name end is connected with the input side of a load; and the automatic control unit is connected with each tap selection module and is used for controlling the on-off of the tap selection module. When the voltage drops, the specific steps of controlling the tap selection module to be switched off by the automatic control unit are as follows: (1) when the voltage is stable: switch K1 is closed and the rest are open; (2) when the voltage drops by 5%: switches K1, K3 are closed, and the rest are open; (3) when the voltage drops by 15%: switches K2, K3 are closed, and the rest are open; (4) when the voltage drops by 25%: switches K2, K4 are closed, and the rest are open; (5) when the voltage drops by 35%: switches K2, K5 are closed, and the rest are open; (6) when the voltage drops by 45%: switches K2, K6 are closed, and the rest are open; (7) when the voltage drops by 55%: switches K2, K7 are closed, and the rest are open.
FIG. 2 is a diagram illustrating a simulation result of a main circuit of the device when the voltage drops to 50%. When the voltage drops to 50%, the comparison graph of the power supply voltage and the load voltage is shown, wherein load is the power supply voltage, and u is the load side voltage, and it can be seen from the graph that when the power supply voltage drops, the load side voltage is basically stable and meets the national voltage quality standard established by the national technical committee for voltage and current classification and frequency standardization (TC1), and is kept within ± 5%.
Claims (4)
1. A distribution network under-voltage automatic compensation method and device based on a bilateral multi-tap transformer are characterized by comprising the following steps: tap selection modules K1-K7; the secondary side T1 of the double-side multi-tap transformer is provided with two taps which are connected in series between a power supply and a load, the homonymous end is connected with the tap selection module, and the heteronymous end is connected with the output side of the load; the primary side T2 of the double-side multi-tap transformer is provided with 5 taps which are connected in parallel on a power supply, the different name end is connected with the tap selection module, and the same name end is connected with the input side of a load; and the automatic control unit is connected with each tap selection module and is used for controlling the on-off of the tap selection module.
2. The method and the device for automatically compensating the undervoltage of the power distribution network based on the bilateral multi-tap transformer as claimed in claim 1, wherein: when the voltage drops to 5%, 15%, 25%, 35%, 45% and 55%, the double-side multi-tap transformer is used for compensating an original and secondary side combination transformation ratio preset table of the corresponding voltage drop, and the preset table is as follows.
3. The method and the device for automatically compensating the undervoltage of the power distribution network based on the bilateral multi-tap transformer as claimed in claim 1, wherein: the tap selection modules K1-K7 are respectively connected with corresponding numbers of taps of the double-side multi-tap transformer.
4. The method and the device for automatically compensating the undervoltage of the power distribution network based on the bilateral multi-tap transformer as claimed in claim 1, wherein: when the voltage drops, the specific steps of controlling the tap selection module to be switched off by the automatic control unit are as follows: (1) when the voltage does not drop: switch K1 is closed and the rest are open; (2) when the voltage drops by 5%: switches K1, K3 are closed, and the rest are open; (3) when the voltage drops by 15%: switches K2, K3 are closed, and the rest are open; (4) when the voltage drops by 25%: switches K2, K4 are closed, and the rest are open; (5) when the voltage drops by 35%: switches K2, K5 are closed, and the rest are open; (6) when the voltage drops by 45%: switches K2, K6 are closed, and the rest are open; (7) when the voltage drops by 55%: switches K2, K7 are closed, and the rest are open.
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| CN202010871101.1A CN112003289A (en) | 2020-08-26 | 2020-08-26 | Power distribution network undervoltage automatic compensation method and device based on bilateral multi-tap transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113258582A (en) * | 2021-06-07 | 2021-08-13 | 长沙理工大学 | Power distribution network under-voltage automatic compensation method and device based on IGBT bidirectional switch current conversion control |
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| CN2201754Y (en) * | 1994-09-05 | 1995-06-21 | 杨德印 | Secondary load linear voltage reducing compensator for voltage mutual inductor |
| CN2788504Y (en) * | 2005-02-25 | 2006-06-14 | 李淑凤 | High precise multi-section voltage-adjusting illuminating regulating device |
| US20100116595A1 (en) * | 2006-08-31 | 2010-05-13 | Otis Elevator Company | Management of power source variations in an elevator drive system |
| CN201490720U (en) * | 2009-07-29 | 2010-05-26 | 南宁微控技术有限公司 | Phased wattles power dynamic compensation device |
| CN102175956A (en) * | 2011-02-17 | 2011-09-07 | 甘肃电力科学研究院 | Long duration induced voltage withstand test device of ultrahigh-voltage transformer |
| CN108512230A (en) * | 2018-05-16 | 2018-09-07 | 长沙理工大学 | Voltage drop and undervoltage compensation method and device based on multi-tap transformer |
| CN208723556U (en) * | 2018-09-06 | 2019-04-09 | 山东电工电气集团新能科技有限公司 | A kind of single phase low voltage line voltage distribution automatic compensator |
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2020
- 2020-08-26 CN CN202010871101.1A patent/CN112003289A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2201754Y (en) * | 1994-09-05 | 1995-06-21 | 杨德印 | Secondary load linear voltage reducing compensator for voltage mutual inductor |
| CN2788504Y (en) * | 2005-02-25 | 2006-06-14 | 李淑凤 | High precise multi-section voltage-adjusting illuminating regulating device |
| US20100116595A1 (en) * | 2006-08-31 | 2010-05-13 | Otis Elevator Company | Management of power source variations in an elevator drive system |
| CN201490720U (en) * | 2009-07-29 | 2010-05-26 | 南宁微控技术有限公司 | Phased wattles power dynamic compensation device |
| CN102175956A (en) * | 2011-02-17 | 2011-09-07 | 甘肃电力科学研究院 | Long duration induced voltage withstand test device of ultrahigh-voltage transformer |
| CN108512230A (en) * | 2018-05-16 | 2018-09-07 | 长沙理工大学 | Voltage drop and undervoltage compensation method and device based on multi-tap transformer |
| CN208723556U (en) * | 2018-09-06 | 2019-04-09 | 山东电工电气集团新能科技有限公司 | A kind of single phase low voltage line voltage distribution automatic compensator |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113258582A (en) * | 2021-06-07 | 2021-08-13 | 长沙理工大学 | Power distribution network under-voltage automatic compensation method and device based on IGBT bidirectional switch current conversion control |
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Application publication date: 20201127 |