CN109103890B - Voltage regulation method and system in low-voltage distribution network - Google Patents
Voltage regulation method and system in low-voltage distribution network Download PDFInfo
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- CN109103890B CN109103890B CN201811128827.5A CN201811128827A CN109103890B CN 109103890 B CN109103890 B CN 109103890B CN 201811128827 A CN201811128827 A CN 201811128827A CN 109103890 B CN109103890 B CN 109103890B
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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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- 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
Abstract
The application provides a voltage regulation method and system in a low-voltage distribution network, and specifically, node voltage analysis is carried out according to a collected three-phase voltage value of a target node in the low-voltage distribution network; and then, judging whether the distributed power supply or the reactive power supply needs to be switched according to a set threshold, if the switching operation needs to be carried out, sending an instruction to a corresponding change-over switch according to the control logic, and executing the corresponding instruction after the change-over switch receives the instruction, so that the problem of system power quality caused by unbalanced voltage or overhigh or overlow voltage of the low-voltage distribution network can be effectively solved, the optimized operation of the low-voltage distribution network is realized, and a new technical support is provided for the promotion of distribution automation.
Description
Technical Field
The disclosure relates to the technical field of low-voltage distribution network operation control, in particular to a method and a system for regulating voltage in a low-voltage distribution network.
Background
Distributed power supplies such as low-voltage distributed photovoltaic and the like are used as clean energy, and the large-scale access to a power distribution network is beneficial to solving the problems of environmental pollution, energy shortage and the like. However, the access of the distributed power source to the low-voltage distribution network will have a serious influence on the voltage distribution, and the influence brings about a greater challenge to the operation of the low-voltage distribution network.
Based on the fact that the low-voltage distribution network in China basically adopts a three-phase four-wire system distribution network mode at present, the proposed operation control method mainly comprises the traditional droop control method, the constant power control method and the like. The PQ control is a short term of an active/reactive control strategy, is usually used for schedulable micro-power output control, and uses a preset power reference value as an active scheduling value and a reactive compensation value. In the PQ control mode, the active and reactive power outputs of the distributed power supply are taken as the set points of the controller. The power output of the inverter is also set to a constant accordingly, so that the controller outputs a given power value regardless of the frequency and voltage variations in the grid, in which case the distributed power source is a voltage controlled current source. And the droop control is the control of power by adjusting the active power/voltage reactive power/frequency. Droop control is similar to the operation characteristics of generators in large power grids, and the output of a voltage inverter is controlled according to the variation characteristics of output power so that the voltage and the frequency of the voltage inverter can automatically track preset droop characteristics.
The power supply adopting PQ control injects certain active power and reactive power into the power grid, and is slightly influenced by load change in a system or output change of other power supplies. However, the electric energy generated by the distributed power supply is not stable, and in order to satisfy the requirement that the power supply injects specified active and reactive power into the power grid, the lowest value of the power supply satisfying conditions is inevitably selected as a reference, and further, the electric energy of the power supply is wasted. The function of the droop control technology is realized by a droop controller, and different droop coefficients can be set according to actual requirements. The droop controller consists of a voltage droop controller and a frequency droop controller, and the voltage and the frequency can be controlled respectively. However, on the premise of keeping the droop coefficient unchanged, the droop controller may cause excessive droop of the output voltage of the power grid, and the amplitude of the power grid voltage is higher due to increased droop adjustment, which affects the voltage quality of the power grid.
Therefore, it is desirable to provide a stable operation control method for low voltage distribution network to optimize the operation of the low voltage distribution network.
Disclosure of Invention
The embodiment of the invention provides a voltage regulating method and system in a low-voltage distribution network, which are used for solving the problem of system power quality caused by unbalanced voltage, overhigh voltage or overlow voltage of the low-voltage distribution network in the prior art and realizing stable operation of the low-voltage distribution network.
According to a first aspect of an embodiment of the present invention, there is provided a method for regulating voltage in a low-voltage distribution network, the method including:
respectively acquiring three-phase voltage values of target nodes in a low-voltage distribution network;
judging whether a distributed power supply exists near the target node;
if the distributed power supply does not exist, switching the reactive power supply to the phase with the lowest voltage in the target node when the voltage unbalance is detected to be greater than the set value of the system according to the three-phase voltage value;
if the distributed power supply exists, judging whether the voltage value of the phase line of the distributed power supply is higher than a first preset voltage value;
if the voltage value is higher than a first preset voltage value, cutting off the distributed power supply;
if the voltage difference value is not higher than the first preset voltage value, judging whether the voltage difference value between the phase line where the distributed power supply is located and the lowest voltage phase is higher than a second preset voltage value;
if the voltage is higher than a second preset voltage value, switching the distributed power supply to a phase with low voltage;
and if the voltage unbalance is not higher than a second preset voltage value, switching the reactive power supply to the phase with the lowest voltage in the target node when the voltage unbalance is detected to be higher than a system set value according to the three-phase voltage value.
Optionally, when it is detected that the voltage imbalance is greater than a system set value according to the three-phase voltage value, switching the reactive power supply to a phase with the lowest voltage in the target node, including:
judging whether the voltage unbalance degree of the target node is greater than a system set value or not according to the three-phase voltage value;
and if the voltage value is larger than the set value of the system, searching a reactive power supply near the target node, and switching the reactive power supply to the phase with the lowest voltage value in the three-phase voltage values.
Optionally, the determining, according to the three-phase voltage value, whether the voltage imbalance of the target node is greater than a system set value includes:
according to the three-phase voltage value, using a formula
Judging whether the voltage unbalance degree of the target node is greater than a system set value or not;
wherein the content of the first and second substances,
the degree of the voltage unbalance is indicated,
represents the highest phase voltage value among the three-phase voltage values,
represents the lowest phase voltage value among the three phase voltage values,
representing the system set point.
Optionally, if the voltage is higher than the first preset voltage value, cutting off the distributed power supply includes:
if the voltage value is higher than a first preset voltage value, judging whether the distributed power supply is locked or not;
and if the locking does not exist, utilizing a fast synchronous change-over switch to cut off the distributed power supply, and recording the action time of the fast synchronous change-over switch.
Optionally, if the voltage value is higher than a second preset voltage value, switching the distributed power supply to the phase with the lower voltage comprises:
if the voltage value is higher than a second preset voltage value, judging whether the distributed power supply is locked or not;
and if no latch-up exists, switching the distributed power supply to the low-voltage phase by using a fast synchronous change-over switch, and recording the action time of the fast synchronous change-over switch.
According to a second aspect of the embodiments of the present invention, there is also provided a voltage regulation system in a low-voltage distribution network, the system including a metering automation device and a power supply switching control device, wherein:
the metering automation device is arranged in the main station and is used for acquiring a three-phase voltage value of a target node in the low-voltage distribution network;
the power supply switching control device is used for executing the following operation steps according to the three-phase voltage value acquired by the metering automation device:
judging whether a distributed power supply exists near the target node;
if the distributed power supply does not exist, switching the reactive power supply to the phase with the lowest voltage in the target node when the voltage unbalance is detected to be greater than the set value of the system according to the three-phase voltage value;
if the distributed power supply exists, judging whether the voltage value of the phase line of the distributed power supply is higher than a first preset voltage value;
if the voltage value is higher than a first preset voltage value, cutting off the distributed power supply;
if the voltage difference value is not higher than a first preset voltage value, judging whether the voltage difference value between the phase line where the distributed power supply is located and the lowest voltage phase is higher than a second preset voltage value;
if the voltage is higher than a second preset voltage value, switching the distributed power supply to a phase with low voltage;
and if the voltage is not higher than a second preset voltage value, switching the reactive power supply to the phase with the lowest voltage in the target node after detecting that the voltage unbalance is greater than a system set value according to the three-phase voltage value.
Optionally, the power switching control device further includes a fast synchronous change-over switch, where the fast synchronous change-over switch is connected between the three-phase line and the distributed power supply and between the three-phase line and the reactive power supply.
According to the technical scheme, the method and the system for regulating the voltage in the low-voltage distribution network provided by the embodiment monitor the three voltages in each node and according to the preset threshold, when the voltage of a certain phase is too high or too low or the voltage among the phases is seriously unbalanced, the distributed power supplies and the reactive power supplies of the phases are switched in time according to the control logic, so that the problem of system electric energy quality caused by unbalanced voltage, too high or too low voltage of the low-voltage distribution network is effectively solved, the optimized operation of the low-voltage distribution network is realized, and a new technical support is provided for the promotion of distribution automation.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic flowchart of a voltage regulation method in a low-voltage distribution network according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a voltage regulation system in a low-voltage distribution network according to an embodiment of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to solve the problem of system power quality caused by unbalanced voltage, overhigh voltage or overlow voltage of the low-voltage distribution network in the prior art, the embodiment provides a voltage regulation method and a voltage regulation system in the low-voltage distribution network, and the low-voltage distribution network is operated in an economic optimal mode by switching a distributed power supply and a reactive power supply in the low-voltage distribution network.
Based on the above principle, the method and system provided by the present embodiment will be described in detail below. Fig. 1 is a schematic flowchart of a voltage regulation method in a low-voltage distribution network according to an embodiment of the present disclosure. As shown in fig. 1, the method specifically includes the following steps:
s110: and respectively acquiring the three-phase voltage values of the target nodes in the low-voltage distribution network.
Specifically, three-phase voltage values of the load of the target node can be collected at the master station, j represents each important node, and the voltage values of each important node are marked as Uaj, Ubj and Ucj.
S120: and judging whether a distributed power supply exists near the target node.
If the distributed power supply does not exist, executing step S170 to detect the voltage unbalance; if the distributed power source exists, step S130 is executed to perform single-term voltage value detection.
S130: and if the distributed power supply exists, judging whether the voltage value of the phase line of the distributed power supply is higher than a first preset voltage value.
Wherein, the judgment formula is shown as the following formula (1):
In the formula, the first step is that,
representing a target node voltage valueThe unit is: kv;
the unit represents a single-phase voltage set threshold value, namely a first preset voltage value: kv is used as the reference.
If so, step S140 is performed, otherwise step S150 is performed.
S140: and if the voltage is higher than the first preset voltage value, cutting off the distributed power supply.
Specifically, if the single-phase voltage has a phenomenon that the amplitude is larger than the set voltage value, the distributed power supply can be quickly cut off by using the quick synchronous change-over switch.
Further, in order to effectively and quickly switch the distributed power supply, the step may further include the following steps:
s141: if the voltage value is higher than a first preset voltage value, judging whether the distributed power supply is locked or not;
s142: and if the locking does not exist, utilizing a fast synchronous change-over switch to cut off the distributed power supply, and recording the action time of the fast synchronous change-over switch.
S150: and if the voltage difference value is not higher than the first preset voltage value, judging whether the voltage difference value between the phase line where the distributed power supply is located and the lowest voltage phase is higher than a second preset voltage value.
Wherein, the judging formula is shown as the following formula (2):
In the formula (I), the compound is shown in the specification,
represents the phase voltage value of the distributed power supply, and the unit is as follows: kv;
represents the voltage lowest phase voltage value, in units: kv;
second preset voltage value, unit, representing a voltage difference setting threshold: kv.
If so, step S160 is performed, otherwise step S170 is performed.
S160: and if the voltage is higher than a second preset voltage value, switching the distributed power supply to the phase with the low voltage.
Specifically, the distributed power source can be switched from the high-voltage phase to the low-voltage phase by using the fast synchronous change-over switch.
Further, in order to effectively and quickly switch the distributed power supply, the step may further include the following steps:
s161: if the voltage value is higher than a second preset voltage value, judging whether the distributed power supply is locked or not;
s162: and if no latch-up exists, switching the distributed power supply to the phase with low voltage by using a fast synchronous switch, and recording the action time of the fast synchronous switch.
S170: and if the voltage unbalance is not higher than a second preset voltage value, switching the reactive power supply to the phase with the lowest voltage in the target node when the voltage unbalance is detected to be higher than a system set value according to the three-phase voltage value.
Specifically, the method can comprise the following steps:
s171: and judging whether the voltage unbalance degree of the target node is greater than a system set value or not according to the three-phase voltage value.
Specifically, a formula may be utilized based on the three-phase voltage values
Judging whether the voltage unbalance degree of the target node is greater than a system set value or not;
wherein, the first and the second end of the pipe are connected with each other,
indicating the voltage unbalance degree, representing the highest phase voltage value in the three-phase voltage values,
represents the highest phase voltage value among the three-phase voltage values,
represents the lowest phase voltage value among the three phase voltage values,
representing the system set point.
S172: and if the voltage value is larger than the set value of the system, searching a reactive power supply near the target node, and switching the reactive power supply to the phase with the lowest voltage value in the three-phase voltage values.
After the steps are completed, the next node in the power distribution network can be continuously searched, and the voltage balance is realized by switching the distributed power supply or the reactive power supply (capacitor bank), so that the power distribution network runs economically.
According to the embodiment, by monitoring three voltages in each node and according to the preset threshold value, when the voltage of a certain phase is too high or too low or the voltage of each phase is seriously unbalanced, the distributed power supply and the reactive power supply are switched in time according to the control logic, so that the problem of system power quality caused by unbalanced voltage, too high voltage or too low voltage of the low-voltage power distribution network is effectively solved, the optimized operation of the low-voltage power distribution network is realized, and a new technical support is provided for the promotion of power distribution automation.
Based on the above adjusting method, the present embodiment further provides a voltage adjusting system. Fig. 2 is a schematic structural diagram of a voltage regulation system in a low-voltage distribution network according to an embodiment of the present application. As shown in fig. 2, the system mainly includes a power switching control device 210, and a metering automation device 220 connected to the power switching control device 210. Wherein:
the power switching control device 220 may be disposed in the master station, and is configured to collect three-phase voltage values of a target node in the low-voltage distribution network.
The metering automation device 220 is configured to perform the following operation steps according to the three-phase voltage values collected by the metering automation device:
judging whether a distributed power supply exists near the target node;
if the distributed power supply does not exist, switching the reactive power supply to the phase with the highest voltage in the target node when the voltage unbalance is detected to be greater than a system set value according to the three-phase voltage value;
if the distributed power supply exists, judging whether the voltage value of a phase line of the distributed power supply is higher than a first preset voltage value;
if the voltage value is higher than a first preset voltage value, cutting off the distributed power supply;
if the voltage difference value is not higher than a first preset voltage value, judging whether the voltage difference value between the phase line where the distributed power supply is located and the lowest voltage phase is higher than a second preset voltage value;
if the voltage is higher than a second preset voltage value, switching the distributed power supply to a phase with a low voltage;
and if the voltage is not higher than a second preset voltage value, switching the reactive power supply to the phase with the lowest voltage in the target node after detecting that the voltage unbalance is greater than a system set value according to the three-phase voltage value.
Furthermore, the power supply switching control device further comprises a fast synchronous change-over switch and a change-over switch control module, wherein the fast synchronous change-over switch is connected between the three-phase line and the distributed power supply and between the three-phase line and the reactive power supply, and the change-over switch control module judges the voltage unbalance degree of the node according to the obtained three-phase voltage value of the target node and controls the fast synchronous change-over switch to switch the distributed power supply or the reactive power supply.
The voltage regulation system provided by the embodiment is based on the power supply switching control device and the metering automation device, and controls the metering automation device to collect three-phase voltages of each load in a distribution area and send the obtained voltages to the power supply switching control device. The power supply switching control device judges whether switching of the distributed power supply or the reactive power supply is needed or not according to the set node voltage unbalance degree, if switching operation is needed, an instruction is sent to the corresponding fast synchronous switch according to the control logic, and after the fast synchronous switch receives the instruction, the corresponding instruction is executed, so that the system power quality problem caused by the low-voltage distribution network voltage unbalance or the overhigh voltage or overlow voltage can be effectively solved, the optimized operation of the low-voltage distribution network is realized, and a new technical support is provided for the distribution automation propulsion.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, they are described in relative terms, as long as they are described in partial descriptions of method embodiments. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The foregoing is only an embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and embellishments can be made without departing from the principle of the present invention, and these should also be regarded as the protection scope of the present invention.
Claims (7)
1. A method for regulating voltage in a low-voltage distribution network is characterized by comprising the following steps:
respectively acquiring three-phase voltage values of target nodes in a low-voltage distribution network;
judging whether a distributed power supply exists near the target node;
if the distributed power supply does not exist, switching the reactive power supply to the phase with the lowest voltage in the target node when the voltage unbalance is detected to be greater than the set value of the system according to the three-phase voltage value;
if the distributed power supply exists, judging whether the voltage value of a phase line of the distributed power supply is higher than a first preset voltage value;
if the voltage value is higher than a first preset voltage value, cutting off the distributed power supply;
if the voltage difference value is not higher than the first preset voltage value, judging whether the voltage difference value between the phase line where the distributed power supply is located and the lowest voltage phase is higher than a second preset voltage value;
if the voltage is higher than a second preset voltage value, switching the distributed power supply to the phase with the lowest voltage;
and if the voltage is not higher than a second preset voltage value, switching the reactive power supply to the phase with the lowest voltage in the target node after detecting that the voltage unbalance is greater than a system set value according to the three-phase voltage value.
2. The voltage regulation method according to claim 1, wherein when it is detected that the voltage imbalance is greater than a system set value according to the three-phase voltage value, switching a reactive power source to a phase with a lowest voltage in the target node comprises:
judging whether the voltage unbalance degree of the target node is greater than a system set value or not according to the three-phase voltage value;
and if the voltage value is larger than the set value of the system, searching a reactive power supply near the target node, and switching the reactive power supply to the phase with the lowest voltage value in the three-phase voltage values.
3. The voltage regulation method according to claim 2, wherein determining whether the voltage imbalance of the target node is greater than a system set value according to the three-phase voltage values comprises:
according to the three-phase voltage value, using a formula
Judging whether the voltage unbalance degree of the target node is greater than a system set value or not;
wherein the content of the first and second substances,
indicating the degree of the unbalance of the voltage,
represents the highest phase voltage value among the three-phase voltage values,
represents the lowest phase voltage value among the three phase voltage values,
representing the system set point.
4. The voltage regulation method of claim 1, wherein cutting off the distributed power supply if above a first preset voltage value comprises:
if the voltage value is higher than a first preset voltage value, judging whether the distributed power supply is locked or not;
and if the locking does not exist, utilizing a fast synchronous change-over switch to cut off the distributed power supply, and recording the action time of the fast synchronous change-over switch.
5. The voltage regulation method of claim 1, wherein switching the distributed power supply to the lowest voltage phase if above a second preset voltage value comprises:
if the voltage value is higher than a second preset voltage value, judging whether the distributed power supply is locked or not;
and if the lock does not exist, switching the distributed power supply to the phase with the lowest voltage by using a quick synchronous switch, and recording the action time of the quick synchronous switch.
6. A voltage regulation system in a low voltage distribution network, said system comprising metering automation means and power supply switching control means, wherein:
the metering automation device is arranged at the main station and used for acquiring a three-phase voltage value of a target node in the low-voltage distribution network;
the power supply switching control device is used for executing the following operation steps according to the three-phase voltage value acquired by the metering automation device:
judging whether a distributed power supply exists near the target node;
if the distributed power supply does not exist, switching the reactive power supply to the phase with the lowest voltage in the target node when the voltage unbalance is detected to be greater than the set value of the system according to the three-phase voltage value;
if the distributed power supply exists, judging whether the voltage value of a phase line of the distributed power supply is higher than a first preset voltage value;
if the voltage value is higher than a first preset voltage value, cutting off the distributed power supply;
if the voltage difference value is not higher than the first preset voltage value, judging whether the voltage difference value between the phase line where the distributed power supply is located and the lowest voltage phase is higher than a second preset voltage value;
if the voltage is higher than a second preset voltage value, switching the distributed power supply to the phase with the lowest voltage;
and if the voltage is not higher than a second preset voltage value, switching the reactive power supply to the phase with the lowest voltage in the target node after detecting that the voltage unbalance is greater than a system set value according to the three-phase voltage value.
7. The system of claim 6, wherein the power switching control device further comprises a fast synchronous diverter switch, wherein the fast synchronous diverter switch is connected between a three-phase line and a distributed power source and between a three-phase line and a reactive power source.
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| CN110854864B (en) * | 2019-11-09 | 2022-01-07 | 许继集团有限公司 | Voltage control method and device for power distribution network line containing distributed power supply |
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