CN114914909A - Reactive power compensation method and system based on magnetically controlled reactor and SVG - Google Patents
Reactive power compensation method and system based on magnetically controlled reactor and SVG Download PDFInfo
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- CN114914909A CN114914909A CN202210620683.5A CN202210620683A CN114914909A CN 114914909 A CN114914909 A CN 114914909A CN 202210620683 A CN202210620683 A CN 202210620683A CN 114914909 A CN114914909 A CN 114914909A
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- controlled reactor
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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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
- Y02E40/10—Flexible AC transmission systems [FACTS]
Abstract
The invention discloses a reactive power compensation system based on a magnetically controlled reactor and SVG, which comprises a 110kV magnetically controlled reactor and an SVG reactive power compensation device, wherein the 110kV magnetically controlled reactor and the SVG reactive power compensation device are both connected to a bus where a load is located, and the 110kV magnetically controlled reactor and the SVG reactive power compensation device are mutually matched to perform reactive power compensation on a 110kV inlet line side. The invention also provides a compensation method. The invention can use the 110kV magnetically controlled reactor and the SVG reactive power compensation device in a matching way, and overcomes the limitation of the two devices when used independently.
Description
Technical Field
The invention relates to the technical field of reactive compensation. More specifically, the invention relates to a reactive power compensation method and system based on a magnetically controlled reactor and SVG.
Background
The 110kV magnetic control reactor is based on a magnetic saturation principle and is mainly used for dynamically adjusting reactive power, so that voltage stability of a system power supply line and a power transmission line is kept, unbalance of the system is compensated, the device has the advantages of high reliability, high safety, good economical efficiency, good adaptability to operating environment requirements and the like, and the device plays a role in the fields of mine electric energy quality control, power grid substations, wind power generation systems and the like.
Subway loads have the characteristics of volatility, unbalance and the like, and with the continuous increase of the length of an external power line, the requirement of a local power grid on the electric energy quality of the subway cannot be met only by adopting SVG. The 110kV magnetically controlled reactor also has self limitation, the 110kV magnetically controlled reactor has the condition of low response speed no matter whether the 110kV magnetically controlled reactor is in a self-excitation type or a separate excitation type, the development and the application of the 110kV magnetically controlled reactor are limited to a certain extent, and the limitation also indirectly causes the adverse effects of increased oscillation fluctuation of a control system, reduced system stability and the like. The response speed can also have adverse effects on the fast dynamic reactive power compensation system. Therefore, it is desirable to design a technical solution that can overcome the above-mentioned drawbacks to a certain extent.
Disclosure of Invention
The invention aims to provide a reactive power compensation method and system based on a magnetically controlled reactor and SVG, which can be used by matching a 110kV magnetically controlled reactor with an SVG reactive power compensation device, and overcomes the limitation of independent use of the two.
To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, the present invention provides a reactive power compensation system based on a magnetically controlled reactor and an SVG, comprising a 110kV magnetically controlled reactor and an SVG reactive power compensation device, wherein the 110kV magnetically controlled reactor and the SVG reactive power compensation device are both connected to a bus where a load is located, and the 110kV magnetically controlled reactor and the SVG reactive power compensation device cooperate with each other to perform reactive power compensation on a 110kV incoming line side.
Further, still include: voltage acquisition device and current acquisition device, voltage acquisition device with current acquisition device is used for gathering voltage data and current data respectively, 110kV magnetically controlled reactor with SVG reactive power compensator carries out reactive compensation to 110kV inlet wire side according to voltage data and current data.
Further, the mode that 110kV magnetically controlled reactor and SVG reactive power compensator mutually support includes: and when the power consumption of the load is less than a first preset value, the 110kV magnetically controlled reactor is used as a main compensation device, and the SVG reactive compensation device is used as an auxiliary compensation device.
Further, according to the power factor required by the opposite side, the 110kV magnetically controlled reactor carries out reactive power compensation, a reactive power difference value is calculated, and the SVG reactive power compensation device carries out compensation on the reactive power difference value.
Further, the mode that 110kV magnetically controlled reactor and SVG reactive power compensator mutually support includes: and when the power consumption of the load is larger than a second preset value or the power consumption fluctuation range is larger than a preset range, the SVG reactive power compensation device is used as a main compensation device, and the 110kV magnetically controlled reactor is used as an auxiliary compensation device.
Further, the SVG reactive power compensation device firstly performs reactive power compensation according to the distance between the opposite side transformer substation and the SVG reactive power compensation device, the voltage data and the current data, and then performs reactive power compensation through the 110kV magnetically controlled reactor.
Further, the mode that 110kV magnetically controlled reactor and SVG reactive power compensator mutually support includes: and the 110kV magnetically controlled reactor and the SVG reactive power compensation device perform reactive power compensation according to a preset output capacity.
Further, still include: a controller for obtaining the voltage data, the current data, a power usage of the load, and a power factor; the server is used for receiving the voltage data, the current data and the power consumption of the load sent by the controller, inputting the neural network prediction model, outputting the reactive compensation quantity of the 110kV magnetically controlled reactor, the reactive compensation quantity of the SVG reactive compensation device and a predicted power factor, and sending the power factor to the controller, the controller respectively controls the 110kV magnetically controlled reactor and the SVG reactive compensation device according to the reactive compensation quantity of the 110kV magnetically controlled reactor and the reactive compensation quantity of the SVG reactive compensation device, the server is further used for comparing the power factor received by the controller with the predicted power factor, and if the error value is larger than the preset value, the neural network prediction model is corrected according to the error value.
According to another aspect of the invention, a reactive power compensation method based on magnetically controlled reactors and SVG is provided for performing reactive power compensation by using the reactive power compensation system based on magnetically controlled reactors and SVG.
The invention at least comprises the following beneficial effects:
according to the working and control characteristics of the 110kV magnetically controlled reactor, the system is matched with the SVG reactive power compensation device in the subway power supply system, different reactive power compensation schemes can be provided through improving the control strategy according to the characteristics of the 110kV magnetically controlled reactor and the SVG reactive power compensation device, the system environment is improved by using the control strategy according to specific working conditions, and therefore the limitation that the two devices are used independently is overcome.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIGS. 1-2 are schematic diagrams of a system configuration according to an embodiment of the present application;
fig. 3 is a schematic diagram of a control strategy in which a 110kV magnetically controlled reactor is used as a master controller and SVG is used as a slave controller in one embodiment of the application.
Fig. 4 is a schematic diagram of a control strategy in which SVG is used as a master control and a 110kV magnetically controlled reactor is used as a slave control in an embodiment of the present application.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
The embodiment of the application provides a reactive power compensation system based on magnetically controlled reactor 1 and SVG, including 110kV magnetically controlled reactor 1 and SVG reactive power compensator 2, 110kV magnetically controlled reactor 1 with SVG reactive power compensator 2 all is connected to load 3 bus 6 at place, 110kV magnetically controlled reactor 1 with SVG reactive power compensator 2 mutually supports and carries out reactive power compensation to 110kV inlet wire side;
the embodiment provides a reactive compensation control scheme which is based on a 110kV magnetically controlled reactor 1 and is combined with SVG for regulation; the control mode of the 110kV magnetically controlled reactor 1 can be adjusted according to the actual reactive power requirement of the opposite side transformer substation, the control mode of the SVG can be adjusted according to the actual reactive power requirement of the opposite side transformer substation, the reactive compensation control scheme of the 110kV magnetically controlled reactor 1 and the SVG can be adjusted according to the actual reactive power requirement of the opposite side transformer substation, and the 110kV magnetically controlled reactor 1 and the SVG respectively play a role in master control or slave control according to the control mode; optionally, the combined control mode includes a mode in which the 110kV magnetically controlled reactor 1 is used as a master control and the SVG is used as a slave control, or a mode in which the SVG is used as a master control and the 110kV magnetically controlled reactor 1 is used as a slave control; optionally, the 110kV magnetically controlled reactor 1 may adjust a control mode according to a requirement of actual reactive power of the opposite-side substation, and may implement automatic control or manual control; optionally, the SVG may adjust the control mode according to the actual reactive power requirement of the opposite-side substation, and includes a local-side voltage acquisition device and a current acquisition device 22; optionally, the combined control mode can be adjusted according to the actual progress of the engineering project, and under the condition that the load 3 changes, the control mode is flexibly adjusted according to the actual reactive power requirement of the opposite side transformer substation, so that automatic control and manual control can be realized; the method can calculate the required maximum reactive compensation capacity in advance according to the system configuration, adjust according to the actual progress of the engineering project, adjust the control mode according to the actual reactive power requirement of the opposite-side transformer substation under the condition of the change of the load 3, and simultaneously perform unified adjustment according to the reactive power requirement required by the system at the side; the embodiment can pre-judge the compensation effect, control the system stability under the condition of small load 3 by taking the protection as a target, and avoid the instability of the system caused by the long-time under-compensation state of the system.
In other embodiments, further comprising: the voltage acquisition device and the current acquisition device 22 are respectively used for acquiring voltage data and current data, and the 110kV magnetically controlled reactor 1 and the SVG reactive power compensation device 2 perform reactive power compensation on a 110kV inlet wire side according to the voltage data and the current data; as shown in fig. 1 and 2, the local side voltage acquisition device and current acquisition device 22 installed between the SVG and the 110kV cable 5 are used for acquiring voltage and current data of a gathering point at the 110kV bus 6 side for power factor compensation, the SVG takes the local point as a compensation point, calculates a correction quantity of reactive compensation according to the distance between the opposite side transformer substation and the SVG and related electrical parameters, superposes the correction quantity on the basis of the local calculation quantity of the SVG to obtain reactive power required by the power factor of the whole substation, and ensures that the power factor of a check point at the outgoing line side of the 110kV line reaches a set target; also included in fig. 1 are equivalent capacitances 23 and 110kV cables 5. The reactive power of the line is comprehensively balanced, and the purposes of compensating the power factor of the opposite side and controlling the reactive power of the outgoing line side of the opposite side are achieved.
As shown in fig. 3, in other embodiments, the manner in which the 110kV magnetically controlled reactor 1 and the SVG reactive power compensation device 2 cooperate with each other includes: when the power consumption of the load 3 is smaller than a first preset value, the 110kV magnetically controlled reactor 1 is used as a main compensation device, and the SVG reactive power compensation device 2 is used as an auxiliary compensation device; the first predetermined threshold may be determined empirically or experimentally; compared with the load below 110kV on the side, the load is smaller in normal operation, and when the power consumption is smaller, the overall stability of the 110kV magnetically controlled reactor 1 is higher, the capacity adjustable range is larger, and the capacity adjustable range which is used as a main control device is larger, so that the SVG device can be used as an auxiliary compensation device, and the 110kV magnetically controlled reactor 1 can be used as a main compensation device.
In other embodiments, according to the power factor required by the opposite side, firstly performing reactive power compensation by the 110kV magnetically controlled reactor 1, and calculating a reactive power difference, and the SVG reactive power compensation device 2 performs compensation on the reactive power difference; specifically, when different load conditions are accurately checked, the SVG compensates the reactive power difference between the full-load state of the 110kV magnetically controlled reactor 1 and the power factor required on the opposite side at present, and a certain reactive power margin is reserved, so that the reactive target value is adjusted, the reactive power of the line is comprehensively balanced, and the purposes of compensating the power factor and controlling the reactive power on the outgoing line side are achieved.
As shown in fig. 4, in other embodiments, the manner in which the 110kV magnetically controlled reactor 1 and the SVG reactive power compensation device 2 cooperate with each other includes: when the power consumption of the load 3 is larger than a second preset value or the fluctuation range of the power consumption is larger than a preset range, the SVG reactive power compensation device 2 is used as a main compensation device, and the 110kV magnetically controlled reactor 1 is used as an auxiliary compensation device; the second predetermined value and the predetermined range may be determined empirically or experimentally; when the load power consumption below 110kV on the side is increased or the load fluctuation is large, considering that the whole response speed of the 110kV magnetically controlled reactor 1 is slower than that of an SVG device, the SVG is selected as a 110kV collecting point power factor main compensation device, the 110kV magnetically controlled reactor 1 is selected as an auxiliary constant value compensation device, the SVG device collects the voltage and current data of a collecting point on the 110kV bus side for power factor compensation, and the SVG uses the voltage and current data as a compensation point.
In other embodiments, the SVG reactive power compensation device 2 performs reactive power compensation according to the distance between the opposite side substation and the SVG reactive power compensation device 2, the voltage data and the current data, and then performs reactive power compensation by the 110kV magnetically controlled reactor 1; specifically, the scheme is that the correction quantity of reactive power compensation is calculated according to the distance between the opposite-side transformer substation and the SVG and related electrical parameters, the correction quantity is superposed on the basis of local calculation quantity of the SVG to obtain reactive power required by the whole substation to reach a power factor, the power factor required by the opposite side of the 110kV line is ensured to reach a set target, the line is enabled to be reactive power comprehensively balanced, and the purpose of compensating the power factor is achieved; preferably, SVG is used as the main control, and 110kV magnetically controlled reactor 1 is used as the control scheme of the slave control, and needs to carry out interconnection communication on SVG devices in particular, so that reactive hedging generated under the independent control mode of two sets of devices is prevented.
In other embodiments, the manner that the 110kV magnetically controlled reactor 1 and the SVG reactive power compensation device 2 cooperate with each other includes: the 110kV magnetically controlled reactor 1 and the SVG reactive power compensation device 2 perform reactive power compensation according to a preset output capacity; specifically, the 110kV magnetically controlled reactor 1 and the SVG can both be set to fixed output, and the two devices preset output capacity, do not change according to the load 3 and the required capacity on the opposite side, and can also play a role in reactive power adjustment.
In other embodiments, further comprising: a controller for obtaining the voltage data, the current data, the power usage and the power factor of the load 3; a server which is established with a neural network prediction model and is used for receiving the voltage data, the current data and the power consumption of the load 3 sent by the controller, and inputting the neural network prediction model, outputting the reactive compensation quantity of the 110kV magnetically controlled reactor 1, the reactive compensation quantity of the SVG reactive compensation device 2 and the predicted power factor, and sends the reactive compensation quantity to the controller, the controller respectively controls the 110kV magnetically controlled reactor 1 and the SVG reactive compensation device 2 according to the reactive compensation quantity of the 110kV magnetically controlled reactor 1 and the reactive compensation quantity of the SVG reactive compensation device 2, the server is also used for comparing the power factor received by the controller with a predicted power factor, and if an error value is greater than a preset value, correcting the neural network prediction model according to the error value;
in the above embodiment, the controller is connected to the 110kV magnetically controlled reactor 1, the SVG reactive power compensation device 2, the voltage acquisition device and the current acquisition device 22, and is used for local data acquisition, storage and forwarding, and the server is in communication connection with the controller, and is used for calculation and feeding back a calculation result to the controller; specifically, a training set and a test set are established according to test generated data, a neural network prediction model is obtained by training the training set, the test set is used for testing, and after the test is passed, the neural network prediction model is put into use; the input of the prediction model of the neural network is voltage data, current data and power consumption of a load 3, and the output is reactive compensation quantity and predicted power factor of two devices, wherein the data all use absolute values; the controller can control the 110kV magnetically controlled reactor 1 and the SVG reactive power compensation device 2 according to the obtained reactive power compensation quantity, so as to realize the mutually matched reactive power compensation; in order to improve the accuracy of control, the predicted power factor is compared with the acquired actual power factor, when the error is more than 20%, the neural network prediction model needs to be corrected, and the specific correction mode can be that related data with the error value near a preset value in a preset historical interval is acquired, and the neural network prediction model is retrained; in the embodiment, the neural network prediction model is used for controlling the 110kV magnetically controlled reactor 1 and the SVG reactive power compensation device 2, so that the accuracy is high, and the system stability is improved.
The embodiment of the application provides a reactive power compensation method based on a magnetically controlled reactor 1 and SVG, and the reactive power compensation system based on the magnetically controlled reactor 1 and SVG is adopted to perform reactive power compensation; specifically, on site, according to the load conditions, whether the train runs or not, the load electricity consumption, the load access condition of the 35kV voltage class side, the reactive hedging generated under the independent control mode of two sets of devices and the like are taken into consideration, and the control mode is comprehensively judged; the load changes in the initial stage, the transition stage and the normal operation stage correspond to different optimal control modes; when the load is small and the power consumption is small, a control scheme that the 110kV magnetically controlled reactor 1 is used as a main control and the SVG is used as a slave control is suggested to be analyzed; when the power consumption of the load is increased or the load fluctuation is large, the SVG is recommended to be analyzed as a main control scheme, and the 110kV magnetically controlled reactor 1 is used as a slave control scheme; the control is always carried out by taking the stability of the system as a target, so that the instability of the system caused by the long-time under-compensation state of the system is avoided.
The number of apparatuses and the scale of the process described herein are intended to simplify the description of the present invention. The application, modifications and variations of the reactive compensation method based on magnetically controlled reactors and SVG of the present invention will be apparent to those skilled in the art.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (9)
1. Reactive power compensation system based on magnetically controlled reactor and SVG, its characterized in that, including 110kV magnetically controlled reactor and SVG reactive power compensator, 110kV magnetically controlled reactor with SVG reactive power compensator all is connected to the generating line at load place, 110kV magnetically controlled reactor with SVG reactive power compensator mutually supports and carries out reactive power compensation to 110kV inlet wire side.
2. The reactive power compensation system based on magnetically controlled reactors and SVG of claim 1, further comprising:
voltage acquisition device and current acquisition device, voltage acquisition device with current acquisition device is used for gathering voltage data and current data respectively, 110kV magnetically controlled reactor with SVG reactive power compensator carries out reactive compensation to 110kV inlet wire side according to voltage data and current data.
3. The reactive power compensation system based on the magnetically controlled reactor and the SVG as claimed in claim 2, wherein the way that the 110kV magnetically controlled reactor and the SVG reactive power compensation device cooperate with each other comprises: and when the power consumption of the load is less than a first preset value, the 110kV magnetically controlled reactor is used as a main compensation device, and the SVG reactive compensation device is used as an auxiliary compensation device.
4. A reactive power compensation system based on magnetically controlled reactors and SVG as claimed in claim 3, wherein said SVG reactive power compensation device compensates for said reactive power difference by first performing reactive power compensation by said 110kV magnetically controlled reactor and calculating a reactive power difference according to a power factor required on the opposite side.
5. The reactive power compensation system based on the magnetically controlled reactor and the SVG as claimed in claim 3, wherein the way that the 110kV magnetically controlled reactor and the SVG reactive power compensation device cooperate with each other comprises: and when the power consumption of the load is larger than a second preset value or the power consumption fluctuation range is larger than a preset range, the SVG reactive power compensation device is used as a main compensation device, and the 110kV magnetically controlled reactor is used as an auxiliary compensation device.
6. The reactive power compensation system based on magnetically controlled reactors and SVG of claim 5, wherein said SVG reactive power compensation device first performs reactive power compensation based on the distance of the opposite side substation from said SVG reactive power compensation device, said voltage data and said current data, and then performs reactive power compensation by said 110kV magnetically controlled reactor.
7. The reactive power compensation system based on the magnetically controlled reactor and the SVG as claimed in claim 1, wherein the way that the 110kV magnetically controlled reactor and the SVG reactive power compensation device cooperate with each other comprises: and the 110kV magnetically controlled reactor and the SVG reactive power compensation device perform reactive power compensation according to a preset output capacity.
8. The reactive power compensation system based on magnetically controlled reactors and SVG of claim 6, further comprising:
a controller for obtaining the voltage data, the current data, a power usage of the load, and a power factor;
the server is used for receiving the voltage data, the current data and the power consumption of the load sent by the controller, inputting the neural network prediction model, outputting the reactive compensation quantity of the 110kV magnetically controlled reactor, the reactive compensation quantity of the SVG reactive compensation device and a predicted power factor, and sending the power factor to the controller, the controller respectively controls the 110kV magnetically controlled reactor and the SVG reactive compensation device according to the reactive compensation quantity of the 110kV magnetically controlled reactor and the reactive compensation quantity of the SVG reactive compensation device, the server is further used for comparing the power factor received by the controller with the predicted power factor, and if the error value is larger than the preset value, the neural network prediction model is corrected according to the error value.
9. A reactive power compensation method based on a magnetically controlled reactor and SVG is characterized in that the reactive power compensation system based on the magnetically controlled reactor and the SVG according to any of claims 1-8 is adopted to perform reactive power compensation.
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