CN116073395A - Intelligent distributed compensation system and method for electric power through line - Google Patents
Intelligent distributed compensation system and method for electric power through line Download PDFInfo
- Publication number
- CN116073395A CN116073395A CN202310200388.9A CN202310200388A CN116073395A CN 116073395 A CN116073395 A CN 116073395A CN 202310200388 A CN202310200388 A CN 202310200388A CN 116073395 A CN116073395 A CN 116073395A
- Authority
- CN
- China
- Prior art keywords
- power
- line
- transformer
- quality control
- control equipment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
-
- 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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
-
- 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
-
- 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
-
- 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
- Y02E40/40—Arrangements for reducing harmonics
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses an intelligent distributed compensation system and a compensation method for an electric power through line, which belong to the technical field of railway electric power and comprise a power substation, a class I power substation and a class II power substation; a management machine is arranged in the power transformation and distribution substation, and an electric power through circuit model is preset in the management machine; the class I substation is provided with a first current transformer, a second current transformer and electric energy quality control equipment; the class II substation is provided with a transformer, a second current transformer and electric energy quality control equipment; the management machine is in data communication with the power quality control equipment; the secondary side of the first current transformer is connected with the electric energy quality control equipment; the high-voltage side of the transformer is connected with an electric power through line through a line inlet switch, and the transformer is connected with electric energy quality control equipment; the management machine obtains real-time measurement data and operation data of the power quality control equipment, stores, accumulates and analyzes the data to obtain a control target, and decomposes the control target into the power quality control equipment.
Description
Technical Field
The invention belongs to the technical field of railway power, and particularly relates to an intelligent distributed compensation system and a compensation method for a power through line.
Background
On the railway power through line, active or passive power quality control equipment is deployed on the low-voltage side of each power utilization unit. The power quality control equipment processes the power quality such as active power, reactive power, harmonic waves, negative sequence and the like on the low-voltage side of the unit.
And an electric power quality control device is arranged at an electric power through outer electric power inlet of the electric power through substation to control reactive power at a high voltage side and eliminate harmonic waves, so that the electric power quality level of the access point reaches the standard.
In the above solution, the power quality control devices work independently and only work on the power quality problem of the line directly connected with the device, and overall treatment on the power quality problem of the whole line is lacking. Further, there is no consideration for the capacitive reactive power generated by the earth leakage current by the cable through the whole line of the power line. The capacitive reactive power of the line can cause the voltage to rise when the far end of the through line is in a light load state, so that the risk of local voltage resonance of the line is further increased.
Disclosure of Invention
The invention aims to overcome the defects of the existing electric power quality control means of an electric power through line, and provides an intelligent distributed compensation system and an intelligent compensation method for the electric power through line.
The first object of the invention is to provide an intelligent distributed compensation system for a power through line, which comprises a power substation, M I-type power substations and N II-type power substations, wherein the power substation, the M I-type power substations and the N II-type power substations are arranged on the power through line; two external power access points are respectively arranged at two ends of the power through line; m and N are natural numbers greater than 0; wherein:
a management machine is arranged in the power transformation and distribution substation and is used for measuring the electric energy quality parameters of the electric power at the position of the electric power through external electric inlet; an electric power through circuit model is preset in the management machine;
a first current transformer, a second current transformer and electric energy quality control equipment are arranged in the class I substation;
a transformer, a second current transformer and electric energy quality control equipment are arranged in the class II substation;
an equivalent capacitance of the power line to the ground is arranged between the class I power substation and the class II power substation;
the management machine is connected with the electric energy through a communication network the quality control equipment performs data communication;
the first current transformer is used for measuring the current magnitude and direction on the electric power through line; the secondary side of the first current transformer is connected with the electric energy quality control equipment;
the high-voltage side of the transformer is connected to the power through line through a line inlet switch, and the low-voltage side of the transformer provides power for loads in a power substation; the transformer is connected with the power quality control equipment;
the second current transformer is used for measuring the output current of the transformer, and the secondary side of the second current transformer is connected with the electric energy quality control equipment;
the management machine acquires real-time measurement data and operation data of the power quality control equipment, stores, accumulates and analyzes the real-time measurement data and the operation data to obtain a control target, and decomposes the control target into each power quality control equipment along the power through line.
Preferably, the supervisor obtains the power quality data at the external electric access point, and obtains the compensation target amount by comparing with the set value; and according to the specification of the power quality control equipment along the line, real-time operation parameters, distributing required compensation quantity according to a control strategy and distributing the compensation quantity to each power quality control equipment along the line through a communication network.
Preferably, the supervisor calculates the compensation amount at certain time intervals and distributes the data to the power quality management devices along the line.
Preferably, the electric energy quality control device calculates the sum of the compensation amount x required by the low-voltage side of the power substation, the compensation amount y required by the through line and the compensation amount z required by the management machine as the output quantity of the electric energy quality control device.
Preferably, the power through line model includes: the power stored in the management machine runs through the capacity of the external electric access point or the capacity of the power transformer, the length of the power line from the first section to the tail end, the length of the power line and the line laying type from the first section to the first power utilization point, the length of the line and the line laying type from the first power utilization point to the second power utilization point, and so on to the length of the line and the line laying type of the last power utilization point, and the capacity of the transformer of each power utilization point, and the capacity of the power quality management equipment.
Preferably, the manager gives an initial value to the line unit capacitive reactive power between every two continuous power utilization points, the change rate of the capacitive reactive power along with temperature and the change rate of the capacitive reactive power along with humidity, the initial value is an empirical value or a calculated value, the manager calculates the capacitive reactive power capacity Sn between every two power utilization points according to the initial value and the power through line model, and the manager sends the capacitive reactive power capacity Sn to the power quality management equipment through each power utilization point on the line through a communication network.
The second object of the present invention is to provide an intelligent distributed compensation method for electric power through wires, which is based on the intelligent distributed compensation system for electric power through wires, and comprises the following steps:
s1, acquiring basic data; the method specifically comprises the following steps: measuring the electric energy quality parameter at the position of the electric power through the external electric inlet through the management machine; acquiring real-time measurement data and operation data of each electric energy quality control device through a management machine;
s2, the management machine stores, accumulates and analyzes the real-time measurement data and the operation data to obtain a control target, and decomposes the control target into each electric energy quality management device along the electric power through line;
s3, every two management machinesThe method comprises the steps that a line unit capacitive reactive power between continuous power utilization points, the change rate of the capacitive reactive power along with temperature and the change rate of the capacitive reactive power along with humidity are endowed with an initial value, the initial value is an empirical value or a calculated value, and according to the initial value and an electric power through line model, the manager calculates the capacitive reactive power capacity S between every two power utilization points n The supervisor uses the capacitive reactive capacity S n The power quality control equipment is transmitted to each power utilization point on the through line through a communication network;
s4, the management machine acquires and records the electric energy quality data and the environment data of the high-voltage side of each power utilization point through a communication network; when the high-voltage side transformer of the electricity consumption point is arranged on the incoming line side of the electricity consumption point, the electric energy quality data X of the high-voltage side of the previous electricity consumption point n High-voltage side power quality data X of the latter power utilization point n+1 Low-voltage side power quality data k x Y of previous power utilization point n The difference is the capacitive reactive Q of the through cable of the section n K is the transformer transformation ratio, i.e
Q n =X n - X n+1 -k*Y n ；
Capacitive reactive Q of the section of through cable n And capacitive reactive capacity S n As correction amount, for the capacitive reactive capacity S n Correcting to obtain new S n Value, new S n The value is labeled Sn'; the algorithm of Sn' is:
Sn’=Q n -S n ；
the management machine transmits Sn' to electric energy quality management equipment which is communicated with each power utilization point along the line through a communication network;
the supervisor is connected with the S n The value is corrected in a timed iteration way, so that the electric energy quality control equipment of all the power utilization points along the through line is adjusted;
s5, each power quality control device receives the S n And the low-voltage side power quality condition of the power utilization point outputs compensation quantity to compensate the power quality operation parameters of the power utilization point;
s6, acquiring data of a first current transformer, a transformer and a second current transformer by power quality management equipment in the class I substation; the power quality control equipment in the class II substation acquires data of the transformer and the second current transformer; the power quality control equipment calculates real-time power quality data according to the voltage and the current output by the transformer, and calculates the required compensation quantity x;
the power quality control equipment multiplies the transformation ratio of the transformer with the output voltage of the low-voltage side to obtain real-time voltage data of the power through line, calculates the power quality data of the power through line through the real-time voltage and the real-time current, and calculates the required compensation amount y;
the electric energy quality control equipment obtains the required compensation quantity z sent by the management machine through a communication network;
the compensation quantity finally output by the electric energy quality control equipment is recorded as m;
s7, the power quality control equipment stores rated output current of the transformer; in the power quality management process, when the current measured by the second current transformer reaches the rated output current of the transformer, the output current of the transformer is limited by maintaining or reducing the compensation amount m.
Preferably, the strategy for reducing the compensation amount m is to reduce the z value first and then the y value if insufficient.
Preferably, when the power through line power supply is changed from one external power supply to two external power supplies, for the class I substation, the current direction flowing through the first current transformer is changed, and the power quality management equipment automatically changes the compensation value y by measuring the current direction of the first current transformer; for a class II substation, the management machine obtains the current direction of the electric power through line through a communication network, and changes the compensation value y; for a class II substation, when the current direction cannot be obtained, assigning a value y according to the preset value; the preset value is equal to a smaller value of the estimated capacitive reactive power of the power through lines at the left side and the right side of the class II substation.
The invention has the advantages and positive effects that:
1. the invention realizes the distributed management of the whole line power quality of the through line through the cooperative control of the power quality management equipment along the through line, and simultaneously meets the power quality target at the power through inlet and the power quality target of each power substation of the whole line.
2. The invention eliminates the problem of remote voltage rise caused by the ground leakage current of the power through line and the risk of local voltage resonance of the through line.
3. According to the invention, the output of the full-line power quality control equipment is uniformly scheduled, and when the reactive idle capacity of the low-voltage side of some nodes is larger, the idle capacity feeds out reactive power to the through line, so that the capacity of the equipment is fully exerted, and waste is avoided.
Drawings
Fig. 1 is a circuit diagram of a preferred embodiment of the present invention.
Wherein: 1. a first current transformer; 2. a transformer; 3. a second current transformer; 4. the electric energy quality treatment equipment; 5. an equivalent capacitance of the power line to ground; 6. and (5) a management machine.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. Based on the technical solutions of the present invention, all other embodiments obtained by a person skilled in the art without making any creative effort fall within the protection scope of the present invention.
Referring to fig. 1, an intelligent distributed compensation system for a power line includes a power substation, M class I substations, and N class ii substations disposed on the power line; two external power access points are respectively arranged at two ends of the power through line, such as an external power A and an external power B in FIG. 1; m and N are natural numbers greater than 0; wherein:
a management machine 6 is arranged in the power transformation and distribution substation, and the management machine 6 is used for measuring the electric energy quality parameters of the electric power at the position of the electric power through external electric inlet; an electric power through circuit model is preset in the management machine 6;
a first current transformer 1, a transformer 2, a second current transformer 3 and electric energy quality control equipment 4 are arranged in the class I substation;
a transformer 2, a second current transformer 3 and electric energy quality control equipment 4 are arranged in the class II substation;
an equivalent capacitance 5 of the power line to the ground is arranged between the class I power substation and the class II power substation;
the management machine 6 is in data communication with the power quality control equipment 4 through a communication network;
the first current transformer 1 is used for measuring the current magnitude and direction on the electric power through line; the secondary side of the first current transformer 1 is connected with the power quality control equipment 4;
the high-voltage side of the transformer 2 is connected to a power through line through a line inlet switch, and the low-voltage side of the transformer 2 provides power for loads in a power substation; the transformer 2 is connected with the power quality control equipment 4;
the second current transformer 3 is used for measuring the output current of the transformer 2, and the secondary side of the second current transformer 3 is connected with the power quality control equipment 4;
the supervisor 6 acquires real-time measurement data and operation data of the power quality control equipment 4, stores, accumulates and analyzes the real-time measurement data and the operation data to obtain a control target, and decomposes the control target to each power quality control equipment 4 along the power through line.
The above preferred embodiments mainly include:
a management machine 6 disposed in the power transmission/distribution station;
and the power quality management equipment 4 is deployed in the power substation along the power through line.
A communication connection is established between supervisor 6 and power quality management equipment 4 using a line communication network (wired or wireless).
The supervisor 6 has the ability to measure the quality parameters of the electrical energy at the power through-out electrical inlet. And the management machine is internally stored with an electric power through circuit model. The management machine obtains real-time measurement data and operation data of all power quality control equipment in the whole line through a communication network. The management machine stores, accumulates and analyzes the data to obtain a control target, and decomposes the control target to each power quality management device along the power through line.
The electric power through line model refers to: the power stored in the management machine penetrates through the capacity of the external electric access point or the capacity of the power transformer, the length of the power line from the first section to the tail end, the length of the power line and the line laying type from the first section to the first power utilization point, the length of the line and the line laying type from the first power utilization point to the second power utilization point, and the like to the last power utilization point, and the capacity of the power transformer of each power utilization point, and the capacity of the power quality management equipment.
The data analysis of the power through line by the supervisor is based on the following settings:
1. the object of data processing is steady-state data (for example, t is more than or equal to 1 min), and transient data (for example, t is less than 1 min) are not processed so as to reduce the data operand; specifically, the system only controls reactive power exceeding of duration exceeding t.
2. The reactive power of each section of power line is mainly capacitive reactive power caused by the ground leakage current of the line and is influenced by the length of the line, the type of a cable, the laying mode, the temperature and the humidity. After the power construction is finished, the change of the capacitive reactive power is mainly influenced by temperature and humidity.
3. The power quality control equipment configured by each power utilization point can meet the capacity requirement of power quality compensation in the power utilization point. The power quality problem at the power through access point is due to the line characteristics.
In the supervisor 6, an initial value is given to the line unit capacitive reactive power between every two consecutive points of use, the rate of change of the capacitive reactive power with temperature, the rate of change of the capacitive reactive power with humidity, this initial value may be an empirical value or a calculated value, typically 0.15A/km for a 10kV overhead line and typically 1A/km for a 10kV buried cabling. Based on the initial value and the power transmission line model, the supervisor 6 calculates the capacitive reactive capacity (Sn is the product of the leakage current, the line voltage, and the line length) between every two power utilization points. The supervisor 6 sends Sn via a communications network to the power quality management equipment 4 running through each power point along the line.
The supervisor 6 obtains and records the power quality data and the environment data of the high-voltage side of each power utilization point through the communication network. If the high-voltage side transformer of the electricity consumption point is arranged on the incoming line side of the electricity consumption point, the difference between the high-voltage side power quality data (set as Xn) of the previous electricity consumption point and the high-voltage side power quality data (set as Xn+1) of the next electricity consumption point and the low-voltage side power quality data (set as k is Yn, k is the transformer transformation ratio) of the previous electricity consumption point is the capacitive reactive power (set as Qn) of the through cable, namely
Q n =X n - X n+1 -k*Y n ；
Will Q n And S is equal to n As a correction amount, to S n Correcting to obtain new S n Value, new S n The value is labeled Sn'; the algorithm of Sn' is:
Sn’=Q n -S n ；
the supervisor sends Sn' to the electric energy quality management equipment which is communicated with each electricity utilization point along the line through a communication network.
The supervisor is connected with the S n And the value is corrected in a timed iteration way, so that the electric energy quality control equipment of all the power utilization points along the through line is adjusted. Through multiple iterations, the power quality control equipment of each power utilization point reaches a stable running state, and the full-line power quality level reaches a target value.
And outputting compensation quantity by the power quality control equipment of each power utilization point along the line according to the received Sn and the power quality condition of the low-voltage side of the power utilization point, and compensating the power quality operation parameters of the power utilization point.
Taking into account the communication delay and the measurement delay, the supervisor 6 calculates the required compensation amount at certain time intervals and distributes the data to the power quality management equipment along the line.
The power quality control device 4 is connected with the low-voltage side of the transformer 2 to obtain output voltage data of the transformer 2. The power quality management equipment 4 is connected with the second current transformer 3 to obtain the output current data of the transformer 2. The power quality control device calculates real-time power quality data according to the voltage and the current output by the transformer 2, calculates the required compensation amount and marks x.
The power quality management equipment 4 is connected with the first current transformer 1 to obtain real-time current data of the power through line. The power quality management equipment 4 multiplies the transformation ratio of the transformer 2 by the output voltage of the low-voltage side to obtain real-time voltage data of the power through line. And calculating the power quality data of the power through line of the section through the real-time voltage and the real-time current, and further calculating the required compensation quantity, and recording as y.
The power quality control device 4 obtains the required compensation quantity sent by the management machine 6 through a communication network and is marked as z.
The compensation amount finally output by the power quality management device 4 is denoted as m.
The power quality management device 4 stores the rated output current of the transformer 2. During the power quality management, if the current measured through the second current transformer 3 reaches the rated output current of the transformer 2, the output current of the transformer 2 is limited by maintaining or reducing the compensation amount m.
The strategy for reducing the compensation m is to reduce the z value first and then the y value if not enough.
When the power through line power supply is changed from the external power A to the external power B, for the class I substation, the current direction flowing through the first current transformer 1 is changed, and the electric energy quality management equipment 4 automatically changes the compensation value y by measuring the current direction of the first current transformer 1. For a class II substation, the supervisor 6 will obtain the current direction of the power through line through the communication network, and change the compensation value y. For a class II substation, when the current direction cannot be obtained, the value y is assigned according to the preset value. The preset value is equal to a smaller value of the estimated capacitive reactive power of the power through lines at the left side and the right side of the class II substation.
The power quality control devices are classified into two types. The I type is that the power through line is provided with a first current transformer 1, the secondary side of the transformer is provided with a second current transformer 3, the high-voltage current signal and the low-voltage current signal on the power through line can be measured, and the electric energy quality control equipment can control the electric energy quality of the low-voltage side and the high-voltage side of the power utilization point at the same time; the class II is that the electric power link circuit access point is not provided with the first current transformer 1, only is provided with the second current transformer 3 at the low-voltage side of the transformer, and the electric energy quality control equipment can only directly control the electric energy quality at the low-voltage side of the power utilization point.
The class I power quality control equipment obtains the power quality parameters of the low-voltage side by measuring the voltage and the current of the low-voltage side and controls the power quality parameters. The high-voltage side voltage is calculated by measuring the low-voltage side voltage and combining the transformer transformation ratio, the high-voltage side power quality data is obtained by combining the high-voltage side (the power through line) current signal, the compensation quantity is injected into the low-voltage side after the average of the received Sn value is achieved, and the high-voltage side power quality is treated through the transformer.
The class II power quality control equipment obtains the power quality parameters of the low-voltage side by measuring the voltage and the current of the low-voltage side and controls the power quality parameters. According to S received through communication network n And (3) injecting compensation quantity into the low-voltage side, and treating the high-voltage side through a transformer.
The power quality management equipment transmits the operation parameters of the power quality management equipment to the management machine through the communication network. The electric energy quality control equipment receives a compensation control quantity instruction S transmitted by a communication network n And then, correcting the compensation quantity injected into the low-voltage side to meet the electric energy quality control target value at the electric power through inlet.
The embodiment can cooperatively control the working parameters of the electric power quality control equipment along the electric power through line, so as to optimally control the electric power quality level of each substation and the external electric access point of the electric power through line, and fully exert the capacity of each electric power quality control equipment along the line.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the invention in any way, but any simple modification, equivalent variation and modification of the above embodiments according to the technical principles of the present invention are within the scope of the technical solutions of the present invention.
Claims (9)
1. The intelligent distributed compensation system for the electric power through line is characterized by comprising a power transformation and distribution station, M I-type power transformation stations and N II-type power transformation stations which are arranged on the electric power through line; two external power access points are respectively arranged at two ends of the power through line; m and N are natural numbers greater than 0; wherein:
a management machine (6) is arranged in the power transformation and distribution substation, and the management machine (6) is used for measuring the electric energy quality parameters of the electric power at the position of the electric power through external electric inlet; an electric power through circuit model is preset in the management machine (6);
a first current transformer (1), a transformer (2), a second current transformer (3) and electric energy quality control equipment (4) are arranged in the class I substation;
a transformer (2), a second current transformer (3) and electric energy quality control equipment (4) are arranged in the class II substation;
an equivalent capacitor (5) of the power line to the ground is arranged between the class I power substation and the class II power substation;
the management machine (6) is in data communication with the power quality control equipment (4) through a communication network;
the first current transformer (1) is used for measuring the current magnitude and direction on the electric power through line; the secondary side of the first current transformer (1) is connected with the power quality control equipment (4);
the high-voltage side of the transformer (2) is connected to a power through line through a line inlet switch, and the low-voltage side of the transformer (2) provides power for loads in a power substation; the transformer (2) is connected with the power quality control equipment (4);
the second current transformer (3) is used for measuring the output current of the transformer (2), and the secondary side of the second current transformer (3) is connected with the power quality control equipment (4);
the management machine (6) acquires real-time measurement data and operation data of the power quality control equipment (4), stores, accumulates and analyzes the real-time measurement data and the operation data to obtain a control target, and decomposes the control target to each power quality control equipment (4) along the power penetration line.
2. The intelligent distributed compensation system of the power through line according to claim 1, characterized in that the supervisor (6) obtains the power quality data at the external power access point, and obtains the compensation target amount by comparing with the set value; and according to the specification of the power quality control equipment along the line, real-time operation parameters, distributing required compensation quantity according to a control strategy and distributing the compensation quantity to each power quality control equipment along the line through a communication network.
3. The power line intelligent distributed compensation system of claim 2, wherein the supervisor (6) calculates the compensation amount at certain time intervals and distributes data to the power quality management equipment along the line.
4. The intelligent distributed compensation system for the power through line according to claim 1, wherein the power quality management device (4) calculates the sum of the compensation amount x required by the low voltage side of the power substation, the compensation amount y required by the through line and the compensation amount z required by the supervisor (6) as the output quantity of the power quality management device (4).
5. The power through-line intelligent distributed compensation system of claim 1, wherein the power through-line model comprises: the power stored in the management machine (6) penetrates through the capacity of the external electric access point or the capacity of the power transformer, the length of the power line from the first section to the tail end, the length of the power line from the first section to the first power utilization point and the line laying type, the length of the line from the first power utilization point to the second power utilization point and the line laying type, and the like to the last power utilization point, and the capacity of the transformer of each power utilization point, and the capacity of the power quality management equipment (4).
6. The intelligent distributed compensation system of the power through line according to claim 1, wherein the supervisor (6) gives an initial value to the line unit capacitive reactive power between every two consecutive power utilization points, the rate of change of the capacitive reactive power with temperature, the rate of change of the capacitive reactive power with humidity, the initial value is an empirical value or a calculated value, the supervisor (6) calculates the capacitive reactive capacity Sn between every two power utilization points according to the initial value and the power through line model, the supervisor (6) calculates the capacitive reactive capacity S n And the power quality control equipment (4) is transmitted to each power utilization point on the through line through a communication network.
7. An intelligent distributed compensation method for an electric power through line, which is characterized in that the intelligent distributed compensation system for the electric power through line based on any one of claims 1-6 is used for completing the following steps:
s1, acquiring basic data; the method specifically comprises the following steps: measuring the electric energy quality parameter at the position of the electric power through the external electric inlet through the management machine; acquiring real-time measurement data and operation data of each electric energy quality control device through a management machine;
s2, the supervisor (6) stores, accumulates and analyzes the real-time measurement data and the operation data to obtain a control target, and decomposes the control target into each electric energy quality management device along the electric power through line;
s3, the manager (6) gives an initial value to the unit capacitive reactive power, the change rate of the capacitive reactive power along with the temperature and the change rate of the capacitive reactive power along with the humidity of each two continuous power utilization points, the initial value is an empirical value or a calculated value, and the manager (6) calculates the capacitive reactive power capacity S between each two power utilization points according to the initial value and the power through line model n The supervisor (6) controls the capacity S n The power quality control equipment (4) is transmitted to each power utilization point on the through line through a communication network;
s4, the management machine (6) acquires and records the electric energy quality data and the environment data of the high-voltage side of each power utilization point through a communication networkThe method comprises the steps of carrying out a first treatment on the surface of the When the high-voltage side transformer of the electricity consumption point is arranged on the incoming line side of the electricity consumption point, the electric energy quality data X of the high-voltage side of the previous electricity consumption point n High-voltage side power quality data X of the latter power utilization point n+1 Low-voltage side power quality data k x Y of previous power utilization point n The difference is the capacitive reactive Q of the through cable of the section n K is the transformer transformation ratio, i.e
Q n =X n - X n+1 -k*Y n ；
Capacitive reactive Q of the section of through cable n And capacitive reactive capacity S n As correction amount, for the capacitive reactive capacity S n Correcting to obtain new S n Value, new S n The value is labeled Sn'; the algorithm of Sn' is:
Sn’=Q n -S n ；
the management machine transmits Sn' to electric energy quality management equipment which is communicated with each power utilization point along the line through a communication network;
the supervisor is connected with the S n The value is corrected in a timed iteration way, so that the electric energy quality control equipment of all the power utilization points along the through line is adjusted;
s5, each power quality control device receives the S n And the low-voltage side power quality condition of the power utilization point outputs compensation quantity to compensate the power quality operation parameters of the power utilization point;
s6, acquiring data of a first current transformer (1), a transformer (2) and a second current transformer (3) by power quality management equipment (4) in the class I substation; the power quality control equipment (4) in the class II substation acquires data of the transformer (2) and the second current transformer (3); the power quality control equipment calculates real-time power quality data according to the voltage and the current output by the transformer, and calculates the required compensation quantity x;
the power quality control equipment multiplies the transformation ratio of the transformer with the output voltage of the low-voltage side to obtain real-time voltage data of the power through line, calculates the power quality data of the power through line through the real-time voltage and the real-time current, and calculates the required compensation amount y;
the electric energy quality control equipment obtains the required compensation quantity z sent by the management machine through a communication network;
the compensation quantity finally output by the electric energy quality control equipment is recorded as m;
s7, the power quality control equipment stores rated output current of the transformer; in the power quality management process, when the current measured by the second current transformer reaches the rated output current of the transformer, the output current of the transformer is limited by maintaining or reducing the compensation amount m.
8. The method of claim 7, wherein the strategy for reducing the compensation m is to reduce the z value first and then the y value if not enough.
9. The intelligent distributed compensation method for the power through line according to claim 7, wherein when the power supply of the power through line is changed from one external power supply to two external power supplies, for the class I substation, the current direction flowing through the first current transformer is changed, and the power quality management device automatically changes the compensation value y by measuring the current direction of the first current transformer; for a class II substation, the management machine obtains the current direction of the electric power through line through a communication network, and changes the compensation value y; for a class II substation, when the current direction cannot be obtained, assigning a value y according to the preset value; the preset value is equal to a smaller value of the estimated capacitive reactive power of the power through lines at the left side and the right side of the class II substation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310200388.9A CN116073395B (en) | 2023-03-06 | 2023-03-06 | Intelligent distributed compensation system and method for electric power through line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310200388.9A CN116073395B (en) | 2023-03-06 | 2023-03-06 | Intelligent distributed compensation system and method for electric power through line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116073395A true CN116073395A (en) | 2023-05-05 |
| CN116073395B CN116073395B (en) | 2023-06-27 |
Family
ID=86169911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310200388.9A Active CN116073395B (en) | 2023-03-06 | 2023-03-06 | Intelligent distributed compensation system and method for electric power through line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116073395B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110336290A (en) * | 2019-06-27 | 2019-10-15 | 中国铁路设计集团有限公司 | A kind of through track reactive power distributed dynamic compensation system and method |
| CN110350542A (en) * | 2019-08-19 | 2019-10-18 | 西南交通大学 | A kind of railway distribution system electric energy quality synthesis compensation apparatus and its control method |
| CN112909963A (en) * | 2021-03-29 | 2021-06-04 | 广东电网有限责任公司中山供电局 | Distribution network and thing networking distributing type reactive compensation system |
| CN113240143A (en) * | 2021-06-30 | 2021-08-10 | 广东工业大学 | High-speed rail power supply intelligent operation and maintenance platform based on industrial internet |
| CN115117892A (en) * | 2022-02-22 | 2022-09-27 | 中铁第一勘察设计院集团有限公司 | Optimization design method for reactive power compensation scheme of electrified railway power through line |
| CN115276033A (en) * | 2022-07-15 | 2022-11-01 | 国网江苏省电力有限公司连云港供电分公司 | Multi-source reactive power participation medium-voltage distribution network line loss optimization method and system |
-
2023
- 2023-03-06 CN CN202310200388.9A patent/CN116073395B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110336290A (en) * | 2019-06-27 | 2019-10-15 | 中国铁路设计集团有限公司 | A kind of through track reactive power distributed dynamic compensation system and method |
| CN110350542A (en) * | 2019-08-19 | 2019-10-18 | 西南交通大学 | A kind of railway distribution system electric energy quality synthesis compensation apparatus and its control method |
| CN112909963A (en) * | 2021-03-29 | 2021-06-04 | 广东电网有限责任公司中山供电局 | Distribution network and thing networking distributing type reactive compensation system |
| CN113240143A (en) * | 2021-06-30 | 2021-08-10 | 广东工业大学 | High-speed rail power supply intelligent operation and maintenance platform based on industrial internet |
| CN115117892A (en) * | 2022-02-22 | 2022-09-27 | 中铁第一勘察设计院集团有限公司 | Optimization design method for reactive power compensation scheme of electrified railway power through line |
| CN115276033A (en) * | 2022-07-15 | 2022-11-01 | 国网江苏省电力有限公司连云港供电分公司 | Multi-source reactive power participation medium-voltage distribution network line loss optimization method and system |
Non-Patent Citations (2)
| Title |
|---|
| YAO DUAN等: "Economic reactive power compensation of the railway power line", 《2010 INTERNATIONAL CONFERENCE ON POWER SYSTEM TECHNOLOGY》, pages 1 - 6 * |
| 张光跃 等: "高速铁路全电缆电力贯通线补偿方案研究", 《电气化铁道》, vol. 33, no. 6, pages 47 - 50 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116073395B (en) | 2023-06-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106208090B (en) | A kind of voltage power-less optimized controlling method and system of photovoltaic generation access | |
| CN111934325B (en) | Cloud edge cooperative voltage reactive intelligent control system and control method | |
| CN109462254A (en) | A method of photovoltaic digestion capability is promoted based on voltage sensibility | |
| CN110445136A (en) | A kind of new energy station reactive voltage control method and platform based on power prediction | |
| CN104767221A (en) | Voltage regulation method based on inverter power coordination control | |
| CN108493985B (en) | Identification method for out-of-limit weak link of voltage of power distribution network containing distributed power supply | |
| CN112952893B (en) | Reactive power control method and device for wind turbine generator and wind power plant | |
| CN107546763A (en) | Photovoltaic generation is maximum in the power distribution network of a kind of meter and different pressure regulation strategies receives capacity calculation method | |
| CN104659790B (en) | Large-sized photovoltaic power station reactive voltage control method | |
| CN109149662A (en) | A kind of more reactive sources of photovoltaic parallel in system coordinate the control method of power output | |
| CN111614117A (en) | Transient voltage disturbance fast response control method for centralized photovoltaic power station | |
| CN113131490B (en) | Reactive power control method, device and system for new energy station | |
| CN104319783B (en) | A kind of power distribution network based on load prediction two grades of coordinated control systems and methods | |
| CN105634132A (en) | 10kV low-voltage intelligent distribution network system with reactive compensation function | |
| CN108767891A (en) | Feeder line photovoltaic is pressed to dissolve model in medium voltage distribution network single | |
| CN105406488A (en) | Overvoltage inhibition method based on reactive power regulation of photovoltaic inverter | |
| CN116073395B (en) | Intelligent distributed compensation system and method for electric power through line | |
| CN108418223A (en) | Active distribution network reactive voltage coordinated operation optimization method and system | |
| CN106972552B (en) | A kind of active power reduction calculation method inhibiting photovoltaic access point voltage out-of-limit | |
| CN108695892A (en) | A kind of distribution network voltage control method adjusted based on photovoltaic DC-to-AC converter | |
| CN105977992B (en) | It is a kind of to change the distribution system that intelligence adjusts idle output based on load | |
| Li et al. | Distributed control of energy-storage systems for voltage regulation in distribution network with high pv penetration | |
| CN104836242A (en) | Reactive power optimization method for regional power grid | |
| CN107508318A (en) | A kind of real power control method and system based on voltage sensibility subregion | |
| CN105977993B (en) | A kind of reactive-load compensation method of the intelligent distribution system based on load |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |