CN110912264A - Method for monitoring heavy overload of distributed power plant in distribution network - Google Patents
Method for monitoring heavy overload of distributed power plant in distribution network Download PDFInfo
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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
- 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
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/185—Electrical failure alarms
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/128—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment involving the use of Internet protocol
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a method for monitoring heavy overload of a distributed power plant in a distribution network, which comprises the following steps: step S1, collecting relevant information of the distributed power plant and relevant information of the power distribution network equipment through the power monitoring system; step S2, operating the power monitoring system, and calculating the capacity occupation ratio lambda of the distributed power plant accessed to the Internet; and step S3, utilizing the capacity occupation ratio lambda to carry out real-time monitoring and alarming on the distributed power plant accessing to the Internet. According to the method, influence monitoring strategies and indexes are introduced, and the hidden danger of heavy overload of the power distribution network equipment caused by distributed power plant access is early warned and monitored; personnel cost is reduced, efficiency is improved, and the calculated numerical value is more accurate.
Description
Technical Field
The invention belongs to the field of distributed power supply monitoring, and relates to a method for monitoring heavy overload of a distributed power plant in a distribution network.
Background
The condition that a plurality of distributed power plants are accessed to the power distribution network exists, and the access modes comprise the access of a 10kV public line, the access of a 10kV special line, the access of a plurality of distributed power plants of a 10kV bus and the like. At present, simple indexes such as power plant output (active power, reactive power and current), voltage and capacity are still adopted for distributed energy monitoring or simply original power plant monitoring, and monitoring is not brought into aiming at potential heavy overload influence of a distributed power source on power distribution network equipment, so that the method comprises the following steps:
1. the simple power plant output monitoring index cannot monitor the overload influence of the distributed power plant on the online line and the online main transformer belonging to the distributed power plant, and the conditions that the online line of the power plant or the main transformer belonging to the online line is overloaded or even the overload and peak load are staggered due to the tripping of the distributed power plant occur;
2. the distributed energy has overlarge output, and reactive power (reverse power) of the distributed energy recoils to a main transformer belonging to the upper network and the upper network when the load is low, so that the relay protection, fault processing and the like are influenced.
3. For the access of a plurality of distributed power plants of a 10kV bus, a dispatcher can not control the influence of the distributed power plants on the access of a power distribution network from the whole, so that the full consumption of distributed energy and energy-saving dispatching are realized;
4. the operation of a dispatcher entering each power plant is complicated, and the workload of the dispatcher is additionally increased;
according to the requirements of the national propulsion energy production and energy consumption revolution, more distributed power plants with larger capacity will be accessed in the future. The access of the distributed power plant enables the original power distribution network to become a multi-source network, and influences are brought to the aspects of operation monitoring, relay protection, power supply quality and the like.
The method has the advantages that the full consumption of new energy is promoted, how to guarantee the safe and stable operation of the power grid operation is guaranteed, the influence on the power grid caused by the access of a distributed power plant is avoided, and the power grid scheduling needs a flexible, intelligent and efficient distributed energy scheduling monitoring index or application to meet the requirements of large-scale consumption of new energy, power supply decentralized optimization and unified scheduling.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to solve the problems that the distributed energy scheduling monitoring index is lacked, and the large-scale consumption of new energy, the power supply decentralized optimization and the unified scheduling requirements cannot be met.
The invention provides a method for monitoring heavy overload of a distributed power plant in a distribution network, which comprises the following steps:
step S1, collecting relevant information of the distributed power plant and relevant information of the power distribution network equipment through the power monitoring system;
step S2, operating the power monitoring system, and calculating the capacity occupation ratio lambda of the distributed power plant accessed to the Internet;
and step S3, utilizing the capacity occupation ratio lambda to carry out real-time monitoring and alarming on the distributed power plant accessing to the Internet.
Further, in step S1, the distributed power plants connected to the internet include a 10kV/20kV dedicated line, a 10kV/20kV public line, and a 10kV/20kV bus multi-distributed power plant hybrid network.
Further, in step S1, the relevant information of the distributed power plant includes active power, reactive power, current and current direction, voltage, and capacity of the distributed power plant.
Further, in step S1, the information related to the distribution network equipment includes active power, reactive power, current and current direction, voltage, and limit information of the distribution network equipment.
Further, in step S2, the distributed power plant with the 10kV/20kV dedicated line accessing the internet is calculated by using the following calculation formula:
wherein λ iszFor the capacity of main transformer on line, IpFor distributed main transformer on-line affiliated main transformer change limit value, Iz1For distributing the current values of the power plant on-linebThe main transformer becomes the transformer switch current value of 10kV/20kV, the main transformer becomes the transformer switch current direction, the direction of the flowing direction of a 10kV/20kV bus is positive, and the direction of the distributed power plant current is positive from the power plant to the load output direction.
Further, in step S2, the distributed power plant with the 10kV/20kV public line accessing the internet is calculated by using the following calculation formula:
wherein λ iszFor the capacity of main transformer on line, lambdaxFor the capacity of the network line, Ig1For distributing the current values of the power plant on-linebThe value of a variable switching current of a 10kV/20kV main transformer2For distribution on power plantsThe current value of the line to which the network belongs, the direction of the main transformer low-change switch current is positive in the direction of flowing to a 10kV/20kV bus, the direction of the distributed power plant current is positive in the direction of power plant load output, and the direction of the distributed power plant network access line current is positive in the direction of flowing to the load.
Further, in step S2, the capacity factor of the distributed power plant with the multiple distributed power plants with 10kV/20kV buses on the hybrid network is calculated by using the following calculation formula:
wherein λ iszFor the capacity of main transformer on line, IpVariable-height limit of distributed main transformergOutputting current value, I, for power plant network access distributed on public linezOutput current value for power plant network access on special line, IbThe value of a variable switching current of a 10kV/20kV main transformerbIn order to distribute the current value of the line to which the power plant surfs, the direction of the main transformer variable-low switch current is positive in the direction of flowing to a 10kV/20kV bus, and the direction of the distributed power plant current is positive in the direction of outputting the load from the power plant.
Further, in step S3, the specific process of real-time monitoring and alarming the distributed power plant accessing the internet by using the capacity factor λ includes setting early warning values of the capacity factor of the internet line and the capacity factor of the main transformer, comparing the real-time capacity factor of the internet line and the real-time capacity factor of the main transformer with the set early warning values, and alarming when the real-time value exceeds the early warning values.
Further, the index of the capacity occupation rate adopts a current value or a power value.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a monitoring method for the heavy overload of a distributed power plant in a distribution network, which provides a monitoring strategy and an index for the influence of the distributed power plant on an internet access line and an affiliated internet main variable weight overload, so that the influence of distributed energy on the internet access line and the main variable weight overload can be intelligently identified, and the hidden danger of the heavy overload of the distributed power plant access to the power distribution network equipment can be early warned; the distributed power plant monitoring indexes are conveniently reduced, and the monitoring burden or personnel of the distributed power plant are reduced;
the calculation of different algorithm parameters according to different connection modes is closer to the reality, the calculated value is more accurate, and effective and timely monitoring and alarming are realized.
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 introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
Fig. 1 is a main flow diagram of an embodiment of a method for monitoring heavy overload of a distributed power plant in a distribution network according to the present invention.
Fig. 2 is a network connection diagram of a 10kV/20kV dedicated line of a distributed power plant provided by the invention.
FIG. 3 is a diagram of the network connection of the 10kV/20kV public line of the distributed power plant provided by the invention.
Fig. 4 is a mixed network connection diagram of a plurality of distributed power plants with 10kV/20kV buses in the distributed power plant provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, a schematic diagram of an embodiment of a monitoring method for heavy overload of a distributed power plant in a distribution network according to the present invention is shown, and in this embodiment, the method specifically includes the steps of:
step S1, collecting relevant information of the distributed power plant and relevant information of the power distribution network equipment through the power monitoring system;
in a specific embodiment, the distributed power plants accessed to the internet comprise a 10kV/20kV special line, a 10kV/20kV public line and a plurality of distributed power plants with 10kV/20kV buses, which are mixed to be networked; the relevant information of the distributed power plant comprises active power, reactive power, current direction, voltage and capacity of the distributed power plant; the relevant information of the power distribution network equipment comprises active power, reactive power, current direction, voltage and limit value information of the power distribution network equipment.
Step S2, operating the power monitoring system, and calculating the capacity occupation ratio lambda of the distributed power plant accessed to the Internet;
in a specific embodiment, as shown in fig. 2, the distributed power plant with the 10kV/20kV dedicated line accessing the internet is calculated by using the following calculation formula:
wherein λ iszFor the capacity of main transformer on line, IpFor distributed main transformer on-line affiliated main transformer change limit value, Iz1For distributing the current values of the power plant on-linebThe main transformer variable-down switching current value is 10kV/20kV, the main transformer variable-down switching current direction is positive in the direction of flowing to a 10kV/20kV bus, and the distributed power plant current direction is positive in the direction of outputting a load from the power plant;
specifically, as shown in fig. 3, the distributed power plant with the network connected to the 10kV/20kV public line is calculated by using the following calculation formula:
wherein λ iszFor the capacity of main transformer on line, lambdaxFor the capacity of the network line, Ig1For distributing the current values of the power plant on-linebThe value of a variable switching current of a 10kV/20kV main transformer2In order to distribute the current value of the line to which the power plant surfs, the current direction of the main transformer low-changing switch is positive in the direction of flowing to a 10kV/20kV bus, and the current direction of the distributed power plant is positive in the direction of flowing to the power plantThe load output direction is positive, and the current direction of the circuit to which the power plant network belongs is distributed to take the direction of the current flowing to the load as positive;
specifically, as shown in fig. 4, the capacity factor of the distributed power plant with multiple distributed power plants on the internet in a mixed manner and with 10kV/20kV buses is calculated by using the following calculation formula:
wherein λ iszFor the capacity of main transformer on line, IpVariable-height limit of distributed main transformergOutputting current value, I, for power plant network access distributed on public linezOutput current value for power plant network access on special line, IbThe value of a variable switching current of a 10kV/20kV main transformerbIn order to distribute the current value of the line to which the power plant surfs, the direction of the main transformer variable-low switch current is positive in the direction of flowing to a 10kV/20kV bus, and the direction of the distributed power plant current is positive in the direction of outputting the load from the power plant.
Step S3, real-time monitoring and alarming are carried out on the distributed power plant accessing to the Internet by using the capacity occupation ratio lambda,
in a specific embodiment, the specific process of performing real-time monitoring and alarming on the distributed power plant accessing to the internet by using the capacity factor λ is to set early warning values of the capacity factor of the internet line and the capacity factor of the main internet main transformer respectively, compare the real-time capacity factor of the internet line and the real-time capacity factor of the main internet main transformer with the set early warning values, and perform alarming when a real-time value exceeds the early warning values, for example, set two early warning values of 95% and 100%, pop up an alarm when the real-time value exceeds the early warning values, so as to remind monitoring personnel and operating personnel to pay attention to load change, enhance inspection of power plant equipment, and the like; above 100%, close attention needs to be paid to the operation of the grid equipment, and loads need to be transferred if necessary.
In the embodiment of the method, under the existing electric power monitoring system, a distributed power plant which accesses a 10kV public line, a 10kV special line and a plurality of distributed power plants of a 10kV bus to the internet is formulated, and monitoring strategies and indexes for the influence of the distributed power plants on the internet line and the affiliated internet main variable weight overload are formulated; the method solves the problems that a plurality of distributed power plants of a 10kV public line, a 10kV special line and a 10kV bus are accessed to a distributed power plant which is accessed to the internet, capacity occupation rate monitoring strategies and indexes are formulated for the internet line and the affiliated internet main transformer, and monitoring function application and intelligent alarm functions are realized, wherein the capacity occupation rate indexes adopt current values and can also adopt power values in a conversion mode.
For further details, reference may be made to the preceding description of the drawings, which are not described in detail herein.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a monitoring method for the heavy overload of a distributed power plant in a distribution network, which provides a monitoring strategy and an index for the influence of the distributed power plant on an internet access line and an affiliated internet main variable weight overload, so that the influence of distributed energy on the internet access line and the main variable weight overload can be intelligently identified, and the hidden danger of the heavy overload of the distributed power plant access to the power distribution network equipment can be early warned; the distributed power plant monitoring indexes are conveniently reduced, and the monitoring burden or personnel of the distributed power plant are reduced;
the calculation of different algorithm parameters according to different connection modes is closer to the reality, the calculated value is more accurate, and effective and timely monitoring and alarming are realized.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (9)
1. A method for monitoring heavy overload of a distributed power plant in a distribution network is characterized by comprising the following steps:
step S1, collecting relevant information of the distributed power plant and relevant information of the power distribution network equipment through the power monitoring system;
step S2, operating the power monitoring system, and calculating the capacity occupation ratio lambda of the distributed power plant accessed to the Internet;
and step S3, utilizing the capacity occupation ratio lambda to carry out real-time monitoring and alarming on the distributed power plant accessing to the Internet.
2. The method of claim 1, wherein in step S1, the grid-connected distributed power plants include a 10kV/20kV private line grid, a 10kV/20kV public line grid, and a 10kV/20kV bus mixed grid.
3. The method of claim 2, wherein in step S1, the relevant information of the distributed power plant includes active power, reactive power, current and current direction, voltage, capacity of the distributed power plant.
4. The method according to claim 3, wherein in step S1, the relevant information of the distribution network equipment includes information of active power, reactive power, current and current direction, voltage, and limit value of the distribution network equipment.
5. The method of claim 4, wherein in step S2, the 10kV/20kV dedicated line-enabled distributed power plant is calculated using the following calculation:
wherein λ iszFor the capacity of main transformer on line, IpFor distributed main transformer on-line affiliated main transformer change limit value, Iz1For distributing the current values of the power plant on-linebThe main transformer becomes the transformer switch current value of 10kV/20kV, the main transformer becomes the transformer switch current direction, the direction of the flowing direction of a 10kV/20kV bus is positive, and the direction of the distributed power plant current is positive from the power plant to the load output direction.
6. The method of claim 5, wherein in step S2, the 10kV/20kV utility grid-connected distributed power plant is calculated using the following calculation:
wherein λ iszFor the capacity of main transformer on line, lambdaxFor the capacity of the network line, Ig1For distributing the current values of the power plant on-linebThe value of a variable switching current of a 10kV/20kV main transformer2For distributing the current value of the line to which the power plant is connected, the direction of the main transformer variable-low switch current is positive in the direction of flowing to a 10kV/20kV bus, the direction of the distributed power plant current is positive in the direction of the power plant to the load output, and the direction of the distributed power plant to which the power plant is connected is positive in the direction of flowing to the load.
7. The method of claim 6, wherein in step S2, the capacity of the 10kV/20kV bus multi-distributed power plant hybrid grid-connected distributed power plant is calculated by using the following calculation formula:
wherein λ iszFor the capacity of main transformer on line, IpVariable-height limit of distributed main transformergOutputting current value, I, for power plant network access distributed on public linezOutput current value for power plant network access on special line, IbThe value of a variable switching current of a 10kV/20kV main transformerbIn order to distribute the current value of the line to which the power plant surfs, the direction of the main transformer variable-low switch current is positive in the direction of flowing to a 10kV/20kV bus, and the direction of the distributed power plant current is positive in the direction of outputting the load from the power plant.
8. The method according to claim 7, wherein in step S3, the real-time monitoring and alarming of the distributed power plant accessing the internet by using the capacity factor λ is specifically performed by setting early warning values of the capacity factor of the internet line and the capacity factor of the main transformer, respectively, comparing the real-time capacity factor of the internet line and the real-time capacity factor of the main transformer with the set early warning values, and alarming when the real-time values exceed the early warning values.
9. A method according to any one of claims 1 to 8, wherein the indication of the occupancy rate is a current value or a power value.
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