CN111668854A - Compensation system for medium-high voltage power grid - Google Patents
Compensation system for medium-high voltage power grid Download PDFInfo
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- CN111668854A CN111668854A CN202010418889.0A CN202010418889A CN111668854A CN 111668854 A CN111668854 A CN 111668854A CN 202010418889 A CN202010418889 A CN 202010418889A CN 111668854 A CN111668854 A CN 111668854A
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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
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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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Abstract
The invention relates to a power grid compensation system, in particular to a compensation system for a medium-high voltage power grid, which comprises a sub-control module and a main control module, wherein the sub-control module is connected with a voltage monitoring device and a current monitoring device which are respectively arranged in a subsystem power grid, the sub-control module is connected with a data processing module which is used for processing monitoring data of the voltage monitoring device and the current monitoring device, the sub-control module is connected with a data classification module which is used for classifying the data processed by the data processing module, and the sub-control module is connected with a compensation strategy selection module which is used for selecting a compensation strategy according to the classification result of the data classification module; the technical scheme provided by the invention can effectively overcome the defects of inaccurate reactive compensation configuration and lack of hierarchy of reactive compensation in the prior art.
Description
Technical Field
The invention relates to a power grid compensation system, in particular to a compensation system for a medium-high voltage power grid.
Background
The reactive power balance of the power grid has important significance on voltage and grid loss, and the excess or deficiency of reactive power can cause the rise or the reduction of the voltage, influence the voltage quality and cause the increase of the grid loss.
At present, the urban power grid in China has more industrial and commercial loads, the distribution is very uneven, the load density in a plurality of areas is high, and the voltage is low at peak load; on the other hand, the obvious peak-to-valley difference causes the operating voltage to be higher at the low valley load and lower at the high peak load. Therefore, a certain number of compensation capacitors and reactors must be installed in the power grid to provide reactive power, improve voltage quality, and reduce grid loss.
However, the current reactive compensation method has the following disadvantages:
1. reactive compensation configuration deficiency
For a long time, in the reactive voltage management, the situations of heavy voltage and light reactive power generally exist, the reactive power management work is neglected for a long time, so that the reactive power compensation configuration is insufficient in most areas, and the provided reactive power compensation capacity can not meet the requirements of reactive power load and reactive power loss of a power grid.
2. Unreasonable reactive compensation configuration
Some old stations carry a large amount of loads but are not provided with or provided with few reactive power compensation devices, so that the power grid loss is increased, and the voltage quality is also reduced; some new stations are provided with large-capacity reactive power compensation devices with small loads, and the utilization rate is low.
3. The reactive compensation calculation method is simple
At present, 15% -30% of the capacity of the transformer is used for configuration value, and the configuration values of various places are random because specific values are not determined. The method is used for configuration, loss reduction and investment are not considered, the value can only compensate the reactive loss of the transformer, and the reactive loss of the upper-stage transmission line of the transformer and the reactive loss and reactive load of the first section of the distribution line cannot be compensated.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects in the prior art, the invention provides a compensation system for a medium-high voltage power grid, which can effectively overcome the defects of inaccurate reactive compensation configuration and lack of hierarchy of reactive compensation in the prior art.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
a compensation system for a medium-high voltage power grid comprises a sub-control module and a main control module, wherein the sub-control module is connected with a voltage monitoring device and a current monitoring device which are respectively arranged in a subsystem power grid, the sub-control module is connected with a data processing module which is used for processing monitoring data of the voltage monitoring device and the current monitoring device, the sub-control module is connected with a data classification module which is used for classifying the data processed by the data processing module, and the sub-control module is connected with a compensation strategy selection module which is used for selecting a compensation strategy according to the classification result of the data classification module;
the system comprises a main control module, a sub-control module, an operation state acquisition module, a parameter model establishment module, a full-network optimization calculation module and a reactive power regulation distribution module, wherein the main control module is communicated with the sub-control module through a wireless communication module, acquires working state parameters of a hybrid reactive power compensation device in a subsystem power grid through the operation state acquisition module, is connected with the parameter model establishment module used for establishing a parameter model according to the working state parameters, is connected with the full-network optimization calculation module used for performing full-network reactive power optimization calculation according to the reactive power input state of the hybrid reactive power compensation device in each subsystem power grid, and is connected with the reactive power regulation distribution module used for issuing reactive power regulation quantity to the sub;
and the sub-control module combines a compensation strategy and a reactive power regulating variable to drive the hybrid reactive power compensation device to perform reactive power compensation in the subsystem power grid.
Preferably, the data processing module calculates the average power factor of the subsystem power grid according to the monitoring data of the voltage monitoring device and the current monitoring device.
Preferably, the data classification module classifies the data processed by the data processing module into a user terminal average power factor, a subsystem power grid average power factor and a whole grid average power factor;
the average power factor of the user terminal is the average power factor from the same monitoring point;
the subsystem power grid average power factor is an average value obtained by multiplying the user terminal average power factor derived from the same distribution transformer by the corresponding weighting factor;
and the whole-network average power factor is an average value obtained by multiplying the whole-network subsystem power network average power factor by the corresponding weighting factor.
Preferably, the weighting factor in the subsystem power grid average power factor is the ratio of the capacity of each user terminal to the capacity of the distribution transformer where the user terminal is located, wherein the sum of the added weighting factors of all the weighting factors under the same distribution transformer is equal to 1;
and the weighting factor in the whole network average power factor is the ratio of the capacity of each sub network to the capacity of the whole network, wherein the sum of all the weighting factors is equal to 1.
Preferably, the sub-control module is connected to a data comparison module for comparing data processed by the data processing module, and the sub-control module is connected to a compensation strategy modification module for modifying a compensation strategy according to a comparison result of the data comparison module.
Preferably, the data comparison module compares the average power factor of the subsystem power grid after the hybrid reactive power compensation device is put into operation with the average power factor before the hybrid reactive power compensation device is put into operation, and the compensation strategy correction module corrects the compensation strategy applied to the hybrid reactive power compensation device according to the comparison result of the data comparison module.
Preferably, the compensation strategy modification module modifies the compensation strategy applied to the hybrid reactive power compensation device by using a PID algorithm.
Preferably, the hybrid reactive power compensation device comprises a user terminal reactive power compensation device, a subsystem power grid reactive power compensation device and a whole power grid reactive power compensation device;
the user terminal reactive compensation device comprises a parallel capacitor, a series capacitor and a shunt reactor;
the subsystem power grid reactive power compensation device comprises a parallel capacitor, a series capacitor, a shunt reactor and a static compensator;
the whole-network reactive power compensation device comprises a synchronous phase modulator, a static compensator and an active filter.
Preferably, the sub-control module is connected with a data storage module for storing monitoring data of the voltage monitoring device and the current monitoring device and data processed by the data processing module.
(III) advantageous effects
Compared with the prior art, the compensation system for the medium-high voltage power grid can calculate the average power factor by utilizing the monitoring data of the voltage monitoring device and the current monitoring device, select a proper compensation strategy according to the average power factor, and drive the hybrid reactive compensation device to perform reactive compensation in the subsystem power grid by combining the reactive adjustment quantity, so that the reactive compensation configuration is more accurate; and reactive compensation can be performed on the user terminal, the subsystem power grid and the whole network according to the classification result of the data processed by the data processing module by the data classification module, so that the method is more hierarchical and targeted.
Drawings
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. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic diagram of the system of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments 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.
A compensation system for a medium-high voltage power grid is disclosed, as shown in figure 1, and comprises a sub-control module and a main control module, wherein the sub-control module is connected with a voltage monitoring device and a current monitoring device which are respectively arranged in a subsystem power grid, the sub-control module is connected with a data processing module which is used for processing monitoring data of the voltage monitoring device and the current monitoring device, the sub-control module is connected with a data classification module which is used for classifying the data processed by the data processing module, the sub-control module is connected with a compensation strategy selection module which is used for selecting a compensation strategy according to the classification result of the data classification module, and the sub-control module is connected with a data storage module which is used for storing the monitoring data of the voltage monitoring device and the current monitoring device and the data processed by the data processing module.
And the data processing module calculates the average power factor of the subsystem power grid according to the monitoring data of the voltage monitoring device and the current monitoring device.
The data classification module divides the data processed by the data processing module into a user terminal average power factor, a subsystem power grid average power factor and a whole network average power factor;
the average power factor of the user terminal is the average power factor from the same monitoring point;
the subsystem power grid average power factor is an average value obtained by multiplying the average power factor of the user terminals from the same distribution transformer by the corresponding weighting factors, the weighting factor in the subsystem power grid average power factor is the ratio of the capacity of each user terminal to the capacity of the distribution transformer where the user terminal is located, and the sum of all the weighting factors under the same distribution transformer is equal to 1;
the total network average power factor is an average value of the subsystem network average power factor of the total network multiplied by the corresponding weighting factor, the weighting factor in the total network average power factor is a ratio of each sub-network capacity to the total network capacity, and the sum of all the weighting factors is equal to 1.
The main control module is communicated with the sub-control modules through the wireless communication module, the main control module collects working state parameters of the hybrid reactive power compensation devices in the subsystem power grids through the running state collection module, the main control module is connected with the parameter model building module used for building a parameter model according to the working state parameters, the main control module is connected with a full-network optimization calculation module used for performing full-network reactive power optimization calculation according to reactive power input states of the hybrid reactive power compensation devices in the subsystem power grids, the main control module is connected with a reactive power regulation distribution module used for issuing reactive power regulation quantities to the sub-control modules according to full-network reactive power optimization calculation results, and the sub-control modules combine compensation strategies and drive the hybrid reactive power compensation devices to perform reactive power compensation in the subsystem power grids.
The hybrid reactive power compensation device comprises a user terminal reactive power compensation device, a subsystem power grid reactive power compensation device and a whole power grid reactive power compensation device;
the user terminal reactive compensation device comprises a parallel capacitor, a series capacitor and a shunt reactor;
the subsystem power grid reactive power compensation device comprises a parallel capacitor, a series capacitor, a shunt reactor and a static compensator;
the whole network reactive power compensation device comprises a synchronous phase modulator, a static compensator and an active filter.
The method comprises the steps of calculating an average power factor by utilizing monitoring data of a voltage monitoring device and a current monitoring device, selecting a proper compensation strategy according to the average power factor, and driving a hybrid reactive compensation device to perform reactive compensation in a subsystem power grid in combination with reactive adjustment quantity, so that the reactive compensation configuration is more accurate; and reactive compensation can be performed on the user terminal, the subsystem power grid and the whole network according to the classification result of the data processed by the data processing module by the data classification module, so that the method is more hierarchical and targeted.
The sub-control module is connected with a data comparison module used for comparing the data processed by the data processing module, and the sub-control module is connected with a compensation strategy correction module used for correcting the compensation strategy according to the comparison result of the data comparison module.
The data comparison module compares the average power factor of the subsystem power grid after the hybrid reactive power compensation device is put into operation with the average power factor before the hybrid reactive power compensation device is put into operation, the compensation strategy correction module corrects the compensation strategy applied to the hybrid reactive power compensation device according to the comparison result of the data comparison module, and the compensation strategy correction module corrects the compensation strategy applied to the hybrid reactive power compensation device by adopting a PID algorithm.
Through setting up the feedback mechanism for reactive compensation has stronger adaptability, effectively promotes the reactive compensation effect of system.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (9)
1. A compensation system for medium and high voltage electrical networks, characterized by: the system comprises a sub-control module and a main control module, wherein the sub-control module is connected with a voltage monitoring device and a current monitoring device which are respectively arranged in a subsystem power grid, the sub-control module is connected with a data processing module which is used for processing monitoring data of the voltage monitoring device and the current monitoring device, the sub-control module is connected with a data classification module which is used for classifying the data processed by the data processing module, and the sub-control module is connected with a compensation strategy selection module which is used for selecting a compensation strategy according to the classification result of the data classification module;
the system comprises a main control module, a sub-control module, an operation state acquisition module, a parameter model establishment module, a full-network optimization calculation module and a reactive power regulation distribution module, wherein the main control module is communicated with the sub-control module through a wireless communication module, acquires working state parameters of a hybrid reactive power compensation device in a subsystem power grid through the operation state acquisition module, is connected with the parameter model establishment module used for establishing a parameter model according to the working state parameters, is connected with the full-network optimization calculation module used for performing full-network reactive power optimization calculation according to the reactive power input state of the hybrid reactive power compensation device in each subsystem power grid, and is connected with the reactive power regulation distribution module used for issuing reactive power regulation quantity to the sub;
and the sub-control module combines a compensation strategy and a reactive power regulating variable to drive the hybrid reactive power compensation device to perform reactive power compensation in the subsystem power grid.
2. Compensation system for medium-high voltage electrical networks according to claim 1, characterized in that: and the data processing module calculates the average power factor of the subsystem power grid according to the monitoring data of the voltage monitoring device and the current monitoring device.
3. Compensation system for medium-high voltage electrical networks according to claim 2, characterized in that: the data classification module divides the data processed by the data processing module into a user terminal average power factor, a subsystem power grid average power factor and a whole network average power factor;
the average power factor of the user terminal is the average power factor from the same monitoring point;
the subsystem power grid average power factor is an average value obtained by multiplying the user terminal average power factor derived from the same distribution transformer by the corresponding weighting factor;
and the whole-network average power factor is an average value obtained by multiplying the whole-network subsystem power network average power factor by the corresponding weighting factor.
4. Compensation system for medium-high voltage electrical networks according to claim 3, characterized in that: the weighting factor in the subsystem power grid average power factor is the ratio of the capacity of each user terminal to the capacity of the distribution transformer where the user terminal is located, wherein the sum of all weighting factors under the same distribution transformer is equal to 1;
and the weighting factor in the whole network average power factor is the ratio of the capacity of each sub network to the capacity of the whole network, wherein the sum of all the weighting factors is equal to 1.
5. Compensation system for medium-high voltage electrical networks according to claim 1, characterized in that: the sub-control module is connected with a data comparison module used for comparing the data processed by the data processing module, and the sub-control module is connected with a compensation strategy correction module used for correcting the compensation strategy according to the comparison result of the data comparison module.
6. Compensation system for medium-high voltage electrical networks according to claim 5, characterized in that: the data comparison module compares the average power factor of the subsystem power grid after the hybrid reactive power compensation device is put into operation with the average power factor before the hybrid reactive power compensation device is put into operation, and the compensation strategy correction module corrects the compensation strategy applied to the hybrid reactive power compensation device according to the comparison result of the data comparison module.
7. Compensation system for a medium-high voltage power grid according to claim 6, characterized in that: and the compensation strategy correction module adopts a PID algorithm to correct the compensation strategy applied to the hybrid reactive power compensation device.
8. Compensation system for medium-high voltage electrical networks according to claim 1 or 6, characterized in that: the hybrid reactive power compensation device comprises a user terminal reactive power compensation device, a subsystem power grid reactive power compensation device and a whole power grid reactive power compensation device;
the user terminal reactive compensation device comprises a parallel capacitor, a series capacitor and a shunt reactor;
the subsystem power grid reactive power compensation device comprises a parallel capacitor, a series capacitor, a shunt reactor and a static compensator;
the whole-network reactive power compensation device comprises a synchronous phase modulator, a static compensator and an active filter.
9. Compensation system for medium-high voltage electrical networks according to claim 1, characterized in that: and the sub-control module is connected with a data storage module for storing monitoring data of the voltage monitoring device and the current monitoring device and data processed by the data processing module.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112886605A (en) * | 2021-01-28 | 2021-06-01 | 广州安能特电气设备有限公司 | Reactive compensation method and device |
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