CN112366716A - Voltage balance system of low-voltage transformer area - Google Patents
Voltage balance system of low-voltage transformer area Download PDFInfo
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- CN112366716A CN112366716A CN202011173382.XA CN202011173382A CN112366716A CN 112366716 A CN112366716 A CN 112366716A CN 202011173382 A CN202011173382 A CN 202011173382A CN 112366716 A CN112366716 A CN 112366716A
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- 238000004146 energy storage Methods 0.000 claims abstract description 101
- 238000006243 chemical reaction Methods 0.000 claims description 23
- 239000002253 acid Substances 0.000 claims description 19
- 230000005540 biological transmission Effects 0.000 claims description 11
- 239000003990 capacitor Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 238000007599 discharging Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000001131 transforming effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- 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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a voltage balance system of a low-voltage transformer area, which comprises an energy storage unit and an energy management system, wherein the energy storage unit is connected with the energy management system; the energy management system monitors the voltage value of the power grid to be monitored in real time, and controls the energy storage unit to provide voltage compensation for the power grid to be monitored when the voltage of the power grid to be monitored is lower than a preset voltage value; the energy storage unit comprises a first energy storage module and a second energy storage module and is used for providing voltage compensation for a power grid to be monitored, wherein the first energy storage module is started preferentially to provide voltage compensation for the power grid to be monitored, and when the voltage of the power grid to be monitored is still lower than a preset voltage value after the voltage compensation is provided for the power grid to be monitored by the first energy storage module, the second energy storage module is started to provide voltage compensation for the power grid to be monitored. The voltage of the power grid to be monitored is supplemented by the energy storage unit which is flexible in charging and discharging, high in response speed and capable of operating in four quadrants, so that the problem of low voltage of a transformer area is effectively solved, and the technical effects of low cost and short implementation period are achieved.
Description
Technical Field
The embodiment of the invention relates to the technical field of voltage balance, in particular to a voltage balance system of a low-voltage transformer area.
Background
Along with rapid economic growth in recent years, contradiction between the power supply capacity of a power distribution network and rapidly-growing power consumption requirements is more and more prominent, so that low-voltage problems frequently occur, and normal power consumption of users is seriously influenced.
In the prior art, measures such as newly building a transformer area or transforming a low-voltage line are generally adopted to solve the problem of low voltage, the measures such as newly building the transformer area or transforming the low-voltage line can improve the reliability level of a basic grid frame, and the measures are effective means for solving the problem of low voltage, but the implementation period is long, the investment of manpower and material resources is large, and the problems such as low utilization rate of electric power assets, low investment benefit of a power grid and the like are easily caused under the conditions that the load fluctuation of the transformer area is large and the load is slowly increased.
Disclosure of Invention
The invention provides a voltage balance system of a low-voltage transformer area, which not only effectively solves the problem of low voltage of the transformer area, but also realizes the technical effects of lower cost and shorter implementation period.
The embodiment of the invention provides a voltage balance system of a low-voltage transformer area, which comprises an energy storage unit and an energy management system, wherein the energy storage unit is connected with the energy management system;
the energy storage unit is connected with a power grid to be monitored, and the energy management system is respectively connected with the energy storage unit and the power grid to be monitored;
the energy management system monitors the voltage value of the power grid to be monitored in real time, and controls the energy storage unit to provide voltage compensation for the power grid to be monitored when the voltage of the power grid to be monitored is lower than a preset voltage value;
the energy storage unit comprises at least one first energy storage module and at least one second energy storage module and is used for providing voltage compensation for the power grid to be monitored, wherein the first energy storage module is started preferentially to provide voltage compensation for the power grid to be monitored, and when the first energy storage module is used for providing voltage compensation for the power grid to be monitored, the voltage of the power grid to be monitored is still lower than the preset voltage value, the second energy storage module is started to provide voltage compensation for the power grid to be monitored.
Further, the first energy storage module is a lead-acid storage battery pack; the second energy storage module is a super capacitor bank.
Further, the capacity of the lead-acid storage battery pack is greater than or equal to 80% of the factory rated capacity of the lead-acid storage battery.
The system further comprises an electric energy conversion unit, wherein the electric energy conversion unit is arranged between the power grid to be monitored and the energy storage unit and is connected with a three-phase power transmission line of the power grid to be monitored;
the electric energy conversion unit is used for converting the direct current provided by the energy storage unit into the alternating current available for the power grid to be monitored.
Further, the electric energy conversion unit comprises at least two AC/DC conversion devices, and each of the first energy storage modules and each of the second energy storage modules are respectively and correspondingly connected with one of the AC/DC conversion devices.
Further, the device also comprises an electric energy balancing unit; the electric energy balance unit is connected with the power transmission line of the power grid to be monitored;
the electric energy balance unit is used for carrying out reactive compensation on the power grid to be monitored when the electric energy of the power grid to be monitored is unbalanced in three phases.
Further, the electric energy balancing unit is a dynamic reactive power compensation device SVG.
And the air conditioner is connected between one phase of power transmission line and a zero line of the three-phase power transmission line of the power grid to be monitored and is used for cooling the energy storage unit.
The system further comprises a battery management system, wherein the battery management system is respectively connected with the energy storage unit and the power grid to be monitored;
the battery management system is used for monitoring the working state of the energy storage unit.
Further, the preset voltage value is 198V.
The invention discloses a voltage balance system of a low-voltage transformer area, which comprises an energy storage unit and an energy management system, wherein the energy storage unit is connected with the energy management system; the energy management system monitors the voltage value of the power grid to be monitored in real time, and controls the energy storage unit to provide voltage compensation for the power grid to be monitored when the voltage of the power grid to be monitored is lower than a preset voltage value; the energy storage unit comprises at least one first energy storage module and at least one second energy storage module and is used for providing voltage compensation for the power grid to be monitored, wherein the first energy storage module is started preferentially to provide voltage compensation for the power grid to be monitored, and when the voltage of the power grid to be monitored is still lower than a preset voltage value after the voltage compensation is provided for the power grid to be monitored by the first energy storage module, the second energy storage module is started to provide voltage compensation for the power grid to be monitored. The voltage of the power grid to be monitored is supplemented by the energy storage unit which is flexible in charging and discharging, high in response speed and capable of operating in four quadrants, so that the problem of low voltage of a transformer area is effectively solved, and the technical effects of low cost and short implementation period are achieved.
Drawings
Fig. 1 is a structural diagram of a voltage balancing system of a low voltage station area according to an embodiment of the present invention;
fig. 2 is a structural diagram of a voltage balancing system of a low voltage station according to another embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
It should be noted that the terms "first", "second", and the like in the description and claims of the present invention and the accompanying drawings are used for distinguishing different objects, and are not used for limiting a specific order. The following embodiments of the present invention may be implemented individually, or in combination with each other, and the embodiments of the present invention are not limited in this respect.
Fig. 1 is a structural diagram of a voltage balancing system of a low-voltage platform according to an embodiment of the present invention.
Fig. 2 is a structural diagram of a voltage balancing system of a low voltage station according to another embodiment of the present invention.
As shown in fig. 1 and 2, the voltage balancing system of the low-voltage transformer area includes an energy storage unit 10, an energy management system EMS; the energy storage unit 10 is connected with a power grid 20 to be monitored, and the energy management system EMS is respectively connected with the energy storage unit 10 and the power grid 20 to be monitored.
The energy management system EMS monitors the voltage value of the power grid 20 to be monitored in real time, and controls the energy storage unit 10 to provide voltage compensation for the power grid 20 to be monitored when the voltage of the power grid 20 to be monitored is lower than a preset voltage value;
the energy storage unit 10 comprises at least one first energy storage module 11 and at least one second energy storage module 12, and is used for providing voltage compensation for the power grid 20 to be monitored, the first energy storage module 11 can select a low-power energy storage device, and the second energy storage module 12 can select a high-power energy storage device; alternatively, referring to fig. 2, the first energy storage module 11 is a lead-acid battery pack; the second energy storage module 12 is a super capacitor bank; the first energy storage module 11 is preferentially started to provide voltage compensation for the power grid 20 to be monitored, and when the voltage of the power grid 20 to be monitored is still lower than a preset voltage value after the first energy storage module 11 provides voltage compensation for the power grid 20 to be monitored, the second energy storage module 12 is started to provide voltage compensation for the power grid 20 to be monitored.
Specifically, the energy management system EMS is configured to issue an instruction when the voltage of the power distribution room is lower than a preset voltage value, and start the first energy storage module 11 to perform voltage compensation on the power grid 20 to be monitored, where the preset voltage value may be set according to a related standard of the power system, for example, it is specified that a single-phase power supply voltage deviation of a low-voltage power distribution room to which the energy storage system is connected should not exceed + 7% to-10% of a nominal voltage, that is, the lower limit of the power distribution room voltage is 198V, and the upper limit is 235.4V, and the voltage exceeding the voltage range belongs to an accident unbalanced voltage range, so that the energy storage unit 10 is controlled by the energy management system EMS to start to provide voltage compensation for the power grid 20 to be monitored when the power distribution room voltage is lower than 198V.
For example, the first energy storage module 11 may select a lead-acid battery to be retired, so as to form a lead-acid battery pack, so as to perform voltage compensation on the power grid 20 to be monitored. Optionally, the capacity of the lead-acid storage battery pack is greater than or equal to 80% of the factory rated capacity of the lead-acid storage battery. Under the normal condition, considerable electric energy still exists in the lead-acid storage battery of retirement, sometimes the capacity of the lead-acid storage battery of retirement can reach more than 80% of the rated capacity of leaving factory, the lead-acid storage battery under this capacity can completely serve as an energy supply device to provide electric energy for the power grid 20 to be monitored, and the lead-acid storage battery also has the advantages of high response speed, four-quadrant operation and the like.
Illustratively, the second energy storage module 12 may select a super capacitor to form a super capacitor group to perform voltage compensation on the power grid 20 to be monitored, the priority of the first energy storage module 11 is higher than that of the second energy storage module 12, when the energy management system EMS monitors that the voltage value of the power grid 20 to be monitored is lower than a preset voltage value, the first energy storage module 11 is preferentially started to provide voltage compensation for the power grid 20 to be monitored, and when the first energy storage module 11 reaches the maximum output capacity to provide voltage compensation for the power grid 20 to be monitored, the voltage of the power grid 20 to be monitored is not raised to a target, that is, is still lower than the preset voltage value, the second energy storage module 12 is started to provide voltage compensation for the power grid 20 to be monitored.
Meanwhile, the energy management system EMS may calculate data such as power of the energy storage unit 10 according to the detected parameters such as the current value and the voltage value, so as to adjust the output power of the energy storage unit 10.
Optionally, as shown in fig. 2, the voltage balancing system of the low-voltage transformer area further includes an electric energy conversion unit 30, where the electric energy conversion unit 30 is disposed between the power grid 20 to be monitored and the energy storage unit 10, and is connected to a three-phase power transmission line of the power grid 20 to be monitored; the electric energy conversion unit 30 is used for converting the direct current provided by the energy storage unit 10 into an alternating current available for the power grid 20 to be monitored. Referring to fig. 2, A, B, C therein is the three-phase transmission line of the power grid 20 to be monitored, and N is the zero line.
Specifically, the voltage provided by the energy storage unit 10 is a direct current voltage, and the power grid 20 to be monitored is a three-phase alternating current, so that the direct current provided by the energy storage unit 10 needs to be converted into an alternating current usable by the power grid 20 to be monitored through the electric energy conversion unit 30.
Alternatively, as shown in fig. 2, the electric energy conversion unit 30 includes at least two AC/DC conversion devices, and one AC/DC conversion device is connected to each of the first energy storage module 11 and each of the second energy storage module 12.
For example, the electric energy conversion unit 30 may select an AC/DC conversion device, referring to fig. 2, taking the first energy storage module 11 as a lead-acid storage battery pack and the second energy storage module 12 as a super capacitor pack as an example, each lead-acid storage battery pack and each super capacitor pack need to be provided with an AC/DC conversion device to convert the DC power provided by the lead-acid storage battery pack into AC power usable by the power grid 20 to be monitored.
Optionally, as shown in fig. 2, the voltage balancing system of the low voltage station area further includes an electric energy balancing unit 40; the electric energy balance unit 40 is connected with the transmission line of the power grid 20 to be monitored; the power balancing unit 40 is configured to perform reactive compensation on the power grid 20 to be monitored when three-phase imbalance occurs in power of the power grid 20 to be monitored.
Specifically, when the three-phase imbalance occurs in the power quality of the platform area, the power balancing unit 40 improves the power quality of the platform area through the power conversion principle of the power balancing unit by monitoring the voltage, phase, frequency and other parameters of the line of the power grid 20 to be monitored, so that the three phases reach a balanced state.
Optionally, the power balancing unit 40 is a dynamic reactive power compensation device SVG.
Illustratively, the dynamic reactive power compensation device SVG may detect the load current in real time through an external current transformer, and calculate through a Digital Signal Processor (DSP) inside the system to extract a reactive component in the load current, and then output a Pulse Width Modulation (PWM) signal to an internal IGBT (Insulated Gate Bipolar Transistor), so that the inverter generates a reactive current having the same magnitude as the load reactive current, and the reactive current having the opposite phase is injected into the power grid 20 to be monitored, so that the current flowing into the power grid 20 to be monitored is a pure sine wave current, thereby achieving the purpose of dynamic compensation, and achieving the technical effect of improving three-phase imbalance of the distribution room.
Optionally, as shown in fig. 2, the voltage balancing system of the low-voltage transformer area further includes an air conditioner 50, where the air conditioner 50 is connected between one of the three-phase transmission lines of the power grid 20 to be monitored and a neutral line, and is used for cooling the energy storage unit 10.
Optionally, as shown in fig. 2, the voltage balancing system of the low-voltage transformer area further includes a battery management system BMS, and the battery management system BMS is respectively connected to the energy storage unit 10 and the power grid 20 to be monitored; the battery management system BMS is used to monitor the operating state of the energy storage unit 10.
In the embodiment of the invention, the voltage balance system of the low-voltage platform area provided by the invention has the following advantages: (1) the problem of low voltage of a low-voltage transformer area can be effectively solved; (2) the problem of three-phase imbalance of a low-voltage transformer area can be effectively solved; (3) the retired lead-acid storage battery is used as a source of the energy storage unit, so that resources are saved, investment cost is reduced, and waste of the battery is avoided; (4) different powers can be output or absorbed according to the lower degree of the voltage, namely when the voltage deviates far from the preset voltage value, the energy storage unit can absorb electric energy (charge) at full power, and the voltage of the power grid to be monitored is adjusted; (5) the energy storage unit provided by the application can realize flexible power capacity configuration and quick power response; (6) the implementation period is short, the effect is obvious, the voltage balance system of the low-voltage transformer area can be used in both a container type and a cabinet type, the refitting can be completed within about two months, the problems of land compensation, dispute and the like are basically not involved, and the implementation mode is simple and effective.
In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A voltage balance system of a low-voltage transformer area is characterized by comprising an energy storage unit and an energy management system;
the energy storage unit is connected with a power grid to be monitored, and the energy management system is respectively connected with the energy storage unit and the power grid to be monitored;
the energy management system monitors the voltage value of the power grid to be monitored in real time, and controls the energy storage unit to provide voltage compensation for the power grid to be monitored when the voltage of the power grid to be monitored is lower than a preset voltage value;
the energy storage unit comprises at least one first energy storage module and at least one second energy storage module and is used for providing voltage compensation for the power grid to be monitored, wherein the first energy storage module is started preferentially to provide voltage compensation for the power grid to be monitored, and when the first energy storage module is used for providing voltage compensation for the power grid to be monitored, the voltage of the power grid to be monitored is still lower than the preset voltage value, the second energy storage module is started to provide voltage compensation for the power grid to be monitored.
2. The voltage balancing system of the low-voltage transformer area of claim 1, wherein the first energy storage module is a lead-acid battery pack; the second energy storage module is a super capacitor bank.
3. The voltage balancing system of the low-voltage transformer area according to claim 2, wherein the capacity of the lead-acid storage battery pack is greater than or equal to 80% of the factory rated capacity of the lead-acid storage battery.
4. The voltage balancing system of the low-voltage transformer area according to claim 1, further comprising an electric energy conversion unit, wherein the electric energy conversion unit is arranged between the power grid to be monitored and the energy storage unit and is connected with a three-phase power transmission line of the power grid to be monitored;
the electric energy conversion unit is used for converting the direct current provided by the energy storage unit into the alternating current available for the power grid to be monitored.
5. The voltage balancing system of the low-voltage transformer area according to claim 4, wherein the power conversion unit comprises at least two AC/DC conversion devices, and one AC/DC conversion device is connected to each of the first energy storage module and each of the second energy storage module.
6. The voltage balancing system of the low-voltage transformer area according to claim 1, further comprising a power balancing unit; the electric energy balance unit is connected with the power transmission line of the power grid to be monitored;
the electric energy balance unit is used for carrying out reactive compensation on the power grid to be monitored when the electric energy of the power grid to be monitored is unbalanced in three phases.
7. The voltage balancing system of the low-voltage transformer area according to claim 6, wherein the power balancing unit is a dynamic reactive power compensation device (SVG).
8. The voltage balancing system of a low-voltage transformer area according to claim 1, further comprising an air conditioner connected between one of the phases of the three-phase transmission line of the power grid to be monitored and a neutral line, for cooling the energy storage unit.
9. The voltage balancing system of a low-voltage transformer area according to claim 1, further comprising a battery management system, wherein the battery management system is respectively connected with the energy storage unit and the power grid to be monitored;
the battery management system is used for monitoring the working state of the energy storage unit.
10. The voltage balancing system of the low voltage pad of claim 1, wherein the predetermined voltage value is 198V.
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