CN111952983A - Reactive energy supply and demand balance control method for Internet +10KV distribution line - Google Patents
Reactive energy supply and demand balance control method for Internet +10KV distribution line Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- 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
- H02J13/00028—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 involving the use of Internet protocols
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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
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
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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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- 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
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/18—Systems supporting electrical power generation, transmission or distribution using switches, relays or circuit breakers, e.g. intelligent electronic devices [IED]
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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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/22—Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units
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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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Abstract
The invention discloses a reactive energy supply and demand balance control method for a distribution line, and particularly relates to a reactive energy supply and demand balance control method for an internet +10KV distribution line. The invention relates to a reactive energy supply and demand balance control method for an internet +10KV distribution line, which is characterized in that a narrow-band internet of things communication technology is adopted to deeply fuse a cloud management machine and a reactive balance point controller, match reactive energy supply and demand information in real time, integrate dispersed reactive energy demands and form local and nearby balance of energy demand and supply. The method realizes high-quality, high-efficiency and safe operation of the power enterprise.
Description
Technical Field
The invention relates to a reactive energy supply and demand balance control method for a distribution line, in particular to a reactive energy supply and demand balance control method for an internet +10KV distribution line, and belongs to the technical field of power transmission and distribution.
Background
The electric power energy can be divided into active power energy and reactive power energy, the reactive power is indispensable energy in the operation of the electric power system, but the minimum transmission of reactive power flow in a power transmission and distribution network is a technical and economic index pursued by electric power enterprises. The invention relates to a control method based on an internet 10KV distribution line reactive energy supply and demand balance technology, which is embodied in the deep fusion of power enterprise energy and the internet.
With the informatization of all links of traditional power production, transmission and consumption, a batch of new on-line and off-line new digitalized, informationized and intelligentized production enterprises and related products are bred, and meanwhile, related latest technologies and patents are still emerging. The electric power company aims at digging and submerging the interior of an enterprise, improving the utilization rate of electric power energy, further realizing the 'throttling' measure of cost management optimization, and pursuing regression enterprise attributes with maximized economic benefits. The reactive energy supply and demand balance is a 'throttling' technology for the internal excavation and the submergence of an electric power enterprise, not only can supply and demand information be matched in real time, but also the dispersed demand can be integrated, the response of energy demand and balance can be formed, and the optimal efficiency of an energy system and the maximum utilization of energy value can be realized.
At present, the reactive energy supply and demand balance of a domestic 10KV line is a control mode based on reactive compensation by taking a power factor as a basis, the power factor changes along with reactive change, and simultaneously, the active change also changes along with the change, however, the power factor is a function of two variables, sometimes, the active change power factor also changes to drive a compensation device to act, and obviously, the power factor is unreasonable. Reactive compensation should aim at the balance of reactive load independent of active. The power factor only tests indexes and does not directly reflect economic indexes, and sometimes the power factor has large active power and covers large reactive power flow. On the other hand, the power factor cannot directly reflect the reactive magnitude, for example, a 10000KVA transformer with full load, when the power factor is changed between 0.9 and 0.95, the reactive load fluctuates between 4358 and 3122 KVAR. The power factor reaches the assessment index, but the active loss caused by reactive power flow is in direct proportion to the square of reactive load, and the active loss generated on the line resistor by the reactive power flow is obviously uneconomical.
On the other hand, in the current reactive power balance mode of a 10KV network, one mode is fixed compensation on a 10KV line and dynamic compensation of breaker switching; the fixed compensation can only compensate the reactive base load part and is manually operated according to load seasons, the dynamic compensation is switched by a circuit breaker generally, the control modes are power factors, and the compensation box is internally provided with the circuit breaker, a current transformer and a capacitor. The other is centralized compensation on a 10KV bus of the transformer substation, the compensation only improves the reactive power flow from a compensation point to a system power supply point, and the problems of voltage drop and power loss on a 10KV line are not solved. The dynamic compensation of the circuit breaker switching on the 10KV line and the centralized dynamic compensation of the capacitor on the 10KV bus of the transformer substation are both controlled by power factors.
At present, the more intelligent reactive power balance mode is SVC and SVG reactive power compensation devices. The common characteristics of the bus compensation device are that the bus compensation device is large in size, suitable for centralized compensation of a 10KV bus of a transformer substation or a 0.38KV bus of a user transformer substation, and not suitable for line compensation. The SVG reactive power compensation device which is relatively perfect in technology has the other characteristic of belonging to active compensation, and the SVG reactive power compensation device not only can balance reactive power requirements after the phase of an active source of a system is shifted, but also can obviously consume system energy and is uneconomical.
According to information inquiry, the published Chinese patent application No. 201910099527.7 discloses a reactive power compensation device, an electric power supply system and a Chinese patent application No. 201910586646.5 discloses a remote monitoring system for the reactive power compensation device of an electric power system, and the two patents have the common characteristic that the reactive power compensation is a power factor control strategy and simultaneously adopts a manual control mode according to the operation parameters of compensation points. Another common feature is that the fling-cut switches all adopt line breakers equipped with current transformers. The Chinese patent No. CN102055196B discloses a reactive compensation optimization method for a 10KV power distribution network in a power system, and the invention only provides an optimization method and does not describe a reactive switching control strategy and related technologies; chinese patent application publication No. CN104953599B discloses a reactive power compensation device for 10KV transmission circuit, which compensates on the 10KV bus of the transformer substation instead of line compensation, similar to SVC or SVG technology.
Chinese patent application publication No. CN 102882217 a discloses a 10KV distribution network head-end operation parameter remote acquisition system and control method invention patent, which has the following technical problems: in the summary of the invention [0020] and [0032], a switching mode is a voltage type, which is an erroneous concept, and the power factor of voltage change may change, the power factor of current change also changes, and sometimes the power factor of voltage change also does not change. The power factor is a function of voltage, current, active power and reactive power, and how a voltage independent variable can control the power factor. In the invention content [0024] ", a signal detection and processing module of the controller is responsible for acquiring voltage and current signals to indirectly obtain a power factor value, and a reactive compensation point does not mention how a current transformer obtains a current source. "analysis and processing of parameters at the collection compensation points to obtain raw data required for compensation decisions" this controller is not of the locally controlled power factor type, since the system control controller itself has no information processing and independent control functions. The invention content and the claim of the patent '10 KV distribution network head end operation parameter remote acquisition system and the control method' do not relate to how the head end operation parameter remote acquisition is realized.
Disclosure of Invention
The invention aims to provide a method for controlling the balance of supply and demand of reactive energy of an internet +10KV power distribution line, which is based on the deep fusion of the reactive energy and the internet, matches supply and demand information in real time, integrates the dispersed demand of the reactive energy, forms the local and nearby balance of the demand and supply of the energy, and realizes the high-quality, high-efficiency and safe operation of power enterprises.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the internet +10KV distribution line reactive energy supply and demand balance control method comprises the steps that a cloud management machine obtains reactive load data in real time through a narrow-band internet of things, when a reactive load rises to the upper limit of a minimum compensation capacity balance point and is delayed above, the cloud management machine searches the minimum compensation capacity balance point in a line, the voltage of the corresponding balance point is obtained through the narrow-band internet of things, if the voltage accords with a controller switching-on command issued through the narrow-band internet of things, the controller controls switching-on, the controller feeds switching-on state information back to the cloud management machine through the narrow-band internet of things, if the reactive load is further increased, when the sum of the minimum compensation capacity and the increment is larger than the upper limit of the second compensation capacity and is delayed above, the cloud management machine obtains the voltage of the second balance point through the narrow-band internet of things, and if the voltage accords with the first balance point controller switching-off, the cloud management machine receives feedback of the switching-off state information of the first balance point and then issues a switching-on instruction of the second balance point controller through the narrow-band internet of things, and the second switching-on state information is fed back to the cloud management machine, so that switching with the capacity larger than the self capacity is always realized when switching is carried out, and the switching is opposite to the switching-off state information when switching is carried out.
The method for the cloud management machine to acquire the reactive load data in real time through the narrow-band Internet of things comprises the following steps: and the cloud management machine directly reads the reactive load data aiming at the line reactive power meter in a dispatching room or a transformer substation through the narrow-band Internet of things.
In order to prevent the influence of frequent maintenance and adjustment of a dispatching room or a transformer substation, the method for acquiring the reactive load data in real time by the cloud management machine through the narrow-band internet of things comprises the following steps: a secondary current of a through type micro current transformer and a secondary side line voltage (two side phases) of a voltage transformer are sleeved in a transformer substation aiming at one phase (middle phase) of a secondary circuit of the line current transformer, and are respectively sent to a data acquisition unit, and a cloud management machine acquires reactive load data from the data acquisition unit through a narrow-band Internet of things.
The method for the cloud management machine to acquire the reactive load data in real time through the narrow-band Internet of things comprises the following steps: and a secondary current of a phase outdoor open type current transformer and a secondary voltage of a voltage transformer in the control box are installed at a first reactive compensation balance point at the outlet of the 10KV distribution line and are respectively sent to a controller in the control box, and the cloud management machine acquires reactive load data from the controller through the narrow-band Internet of things.
Two sets of vacuum contactors can be installed in the control box, one controller is provided with two sets of control loops for acquisition, receiving, sending and narrow-band Internet of things, one voltage transformer is shared, and reactive power balance of two different or same capacities at one point can be realized.
The vacuum contactor is driven by an alternating current rectifying and super capacitor direct current power supply.
The reactive demand balance is that the reactive power supply is put into use when the actual reactive load capacity is 110% of the compensation capacity of the balance point and is delayed.
The delay time is 2 minutes.
Due to the adoption of the technical scheme, the invention has the following characteristics and effects:
the invention changes the traditional control mode of the 10KV line based on the reactive power balance by taking the power factor as the basis and the reactive power supply and demand balance mode based on the demand of directly acquiring the reactive energy. The cloud management machine is adopted, different regions are shared, and a user directly logs in the password to access and monitor at any time in different regions. Based on the narrow-band Internet of things cellular communication technology, the cloud management machine and the reactive balance point controller are deeply fused to form real-time management and control of the Internet technology, and the reactive energy supply and demand are always kept in a balance state. Compared with the traditional power factor local control method, the method is different from the traditional power factor local control method, except that the current transformer is arranged at the balance point for acquiring reactive load data, the current transformers are not needed at other balance points, and compared with the power factor local control type, the method has the characteristics of simple principle, small volume, light weight and the like, and the reactive power flow at the balance points can flow in two directions. The active loss of the reactive load on the line resistance is in direct proportion to the square of the reactive power, the electric energy loss is in a relation of 1 to 4 compared with the power factor local control under the same reactive load, and the voltage drop is in a relation of 1 to 2 in the same way.
The power factor local control type can be put into operation only when the reactive load exceeds the compensation capacity of the balance point, the reactive energy source supply and demand balance method is that the cloud management machine balances according to the reactive demand of the whole line, if one line has the reactive power source with the same capacity, the cloud management machine firstly sends the reactive power source at the tail end to be put into operation, and compared with the power factor local control type, the power factor local control type has the advantages that the equipment operation rate is high, and the voltage quality is better improved.
The vacuum contactor in the control box is suitable for frequent operation, is driven by an alternating current rectifying and super capacitor direct current power supply in order to improve the reliability of switching-on and switching-off, and has the characteristics of small volume and light weight.
Two sets of vacuum contactors can be installed in the control box, one controller is provided with two sets of acquisition and receiving circuits, a narrow-band Internet of things and control loops, and one voltage transformer is shared, so that reactive power supply and demand balance of one point with two different or same capacities can be realized.
The cloud management machine is not influenced by regions or local areas, and a user directly logs in a password to access, monitor and control at any time. The cloud management machine has the capabilities of data, knowledge, representation, acquisition, access and knowledge processing, meanwhile has the functions of reasoning, judgment and making corresponding action instructions, and has automatic organization and automatic adaptability. And then, the cloud management machine and the controller are integrated with each other, so that the real-time management and control of the Internet technology are realized to reach an intelligent state, and the reactive energy utilization rate and the balance level are improved. The reactive energy and the internet are deeply fused, supply and demand information is matched in real time, dispersed reactive energy demands are integrated, the energy demands and supply are locally and nearby balanced, and high-quality, high-efficiency and safe operation of power enterprises is realized.
The drop-out fuse, the lightning arrester, the outdoor capacitor and the control box of the reactive compensation point are small in size, light in weight and installed in a split mode. Different from the power factor local control type, all equipment elements are arranged in a box body, the size is large, the weight is heavy, the double-dry installation is realized, the crane construction is adopted, and no matter the occupied area and the construction need a certain expense.
Detailed description of the invention
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the embodiments will be described below, and it is obvious that the following descriptions are only some embodiments of the present invention, and it is obvious for those skilled in the art that other embodiments can be obtained according to the embodiments without any creative effort.
Example 1:
the method for controlling the reactive energy supply and demand balance of the internet +10KV power distribution line is described in detail by taking the example that the controller obtains reactive load data as an example, wherein the secondary current of a phase (intermediate phase) outdoor open-type current transformer and the secondary side line voltage (two side phases) of a voltage transformer in a control box are respectively transmitted to the controller in the control box from a first reactive compensation balance point of a head end outlet of the 10KV power distribution line.
The method comprises the following specific steps: the method comprises the steps that a cloud management machine acquires reactive data from a first reactive load balance point controller in a 10KV power distribution line through a narrow-band internet of things, when reactive load rises to more than 110% of minimum compensation capacity, the time is delayed for 2 minutes, the cloud management machine searches for the minimum compensation capacity balance point in the power distribution line, the voltage of the corresponding balance point is acquired through the narrow-band internet of things, if the voltage meets conditions, a controller closing instruction is issued through the narrow-band internet of things, the controller drives a vacuum contactor to close, and closing state information is fed back to the cloud management machine through the narrow-band internet of things by the controller. The cloud end management machine continuously acquires the reactive energy demand from the first reactive load balance point through the narrowband Internet of things, if the reactive load is further increased, when the minimum compensation capacity and the increment superposition are increased to be more than 110% of the second compensation capacity, the time delay is 2 minutes and the voltage of the second capacity balance point is stable, the cloud end management machine searches the voltage of the second capacity balance point through the narrowband Internet of things, if the judgment is in accordance with the requirement of issuing a brake-off command of the first reactive balance point controller through the narrowband Internet of things, the cloud end management machine obtains the feedback of the brake-off state information through the narrowband Internet of things of the first balance point and then issues a switch-on command of the second balance point controller through the narrowband Internet of things, the second balance point controller drives the vacuum contactor to switch on, and feeds back the switch-on state information to the. In a word, switching is always carried out with the capacity larger than the self capacity when the balance is put in, and on the contrary, the whole balance process is completed by the cloud management machine when the balance is cut off.
Example 2
The internet +10KV distribution line reactive energy supply and demand balance control method is described in detail by taking an example that a cloud management machine directly reads reactive load data for a line reactive power meter in a dispatching room or a transformer substation through a narrowband internet of things.
The cloud management machine obtains reactive load data recorded by a reactive power meter in real time through the narrowband Internet of things, when the reactive load rises to more than 110% of the minimum compensation capacity, the reactive load data is delayed for 2 minutes, the cloud management machine searches for the minimum compensation capacity balance point in the circuit, the voltage of the corresponding balance point is obtained through the narrowband Internet of things, if the voltage accords with the requirement of issuing a controller closing instruction through the narrowband Internet of things, the controller controls closing, the controller feeds closing state information back to the cloud management machine through the narrowband Internet of things, if the reactive load is further increased, when the minimum compensation capacity and the increment superposition are increased to be more than 110% of the second compensation capacity, the delay is kept for 2 minutes, the cloud management machine obtains the voltage of the second balance point through the narrowband Internet of things, if the voltage accords with the first balance point controller opening through the narrowband Internet of things, the cloud management machine obtains the first balance point opening state information and feeds back the first balance point opening state information and then And a switching-on instruction of the balance point controller and second switching-on state information are fed back to the cloud management machine, switching between switching and switching with a capacity larger than the self capacity is always realized when the switching-in is carried out, and switching is opposite to switching-off when the switching-off is carried out.
Example 3
The internet +10KV distribution line reactive energy supply and demand balance control method is described in detail by taking the example that the secondary current of a through type micro current transformer is sleeved on one phase (middle phase) of a secondary circuit of the line current transformer in a transformer substation and the line voltage of the secondary side (two side phases) of a voltage transformer are respectively sent to a data collector, and a cloud management machine obtains reactive load data from the data collector through a narrow-band internet of things.
The cloud management machine obtains reactive load data recorded by the data collector in real time through the narrowband Internet of things, when reactive load rises to more than 110% of minimum compensation capacity, the reactive load data are delayed for 2 minutes, the cloud management machine searches for a balance point of the minimum compensation capacity in a circuit, the voltage of a corresponding balance point is obtained through the narrowband Internet of things, if the voltage accords with a controller closing instruction issued through the narrowband Internet of things, the controller controls closing, the controller feeds closing state information back to the cloud management machine through the narrowband Internet of things, if the reactive load is further increased, when the minimum compensation capacity and the increment superposition are increased and are more than 110% of second compensation capacity, the delay is stabilized for 2 minutes, the cloud management machine obtains the voltage of a second balance point through the narrowband Internet of things, if the voltage accords with the first balance point controller opening through the narrowband instruction, the cloud management machine issues a second average through the narrowband Internet of things after obtaining the first balance point opening state information feedback And a switching-on instruction of the balance point controller and second switching-on state information are fed back to the cloud management machine, switching between switching and switching with a capacity larger than the self capacity is always realized when the switching-in is carried out, and switching is opposite to switching-off when the switching-off is carried out.
The drop-out fuse, the lightning arrester, the outdoor capacitor and the control box of the reactive compensation point are installed in a split mode.
The invention relates to a reactive energy supply and demand balance control method for an internet +10KV distribution line, which comprises the following specific installation wiring modes: the first reactive load balance point for providing the reactive energy demand data acquisition of the 10KV distribution line needs to be provided with a phase outdoor open type current transformer (intermediate phase), the construction is simple and convenient, and the subsequent reactive balance points do not need to be provided with the current transformer because the subsequent n balance points do not need to acquire reactive data. The reactive balance point is installed with a first wiring, which is from the T connection of three lines of 10KV distribution line to the power end of the drop-out fuse, the other end is connected to the incoming line terminal and the lightning arrester of the control box, the incoming line terminal of the power supply in the control box is connected to the vacuum contactor, the two primary sides of the voltage transformer are respectively connected to the two side phase lines of the incoming line terminal of the power supply, and the other end of the vacuum contactor is connected to the capacitor outside the box body through the outgoing line terminal in. The secondary wiring is that the secondary current of the current transformer and the secondary voltage of the voltage transformer are respectively connected to the controller, and simultaneously, the secondary wiring is connected to the controller through the auxiliary contact of the vacuum contactor so as to collect the on-off state information of the vacuum contactor. In addition, the secondary side voltage of the voltage transformer drives the vacuum contactor through a controller rectification loop.
The invention relates to a reactive energy supply and demand balance control method for an internet +10KV power distribution line, which determines the reactive balance capacity and the balance point position of the 10KV power distribution line. The total balance capacity of one line is determined according to the maximum reactive power flow typical day in the last two years, the positions of the balance points are determined according to the factors of the reactive load size, the characteristics of a power distribution network, the power supply radius length and the like, 2-3 or 4 balance points are determined, the balance capacities of different balance points are different, for example, the balance compensation capacity is 200KVAR, two groups of combinations of 80KVAR and 120KVAR are selected for the compensation capacity of two-point balance, and the purpose of compensation smooth adjustment is achieved. The positions of the two balance compensation points are that the maximum reactive power flow is distributed according to the distribution variable capacity proportion (or according to the actual reactive load statistics of the corresponding time point of the centralized meter reading system, if the reactive power consumption part of the transformer is required to be added in the centralized meter reading on the secondary side of the distribution transformer), the reactive power demand is accumulated to 60KVAR from the tail end statistics, namely the position of the second balance point (120 KVAR), at the moment, the compensation point transmits 60KVAR to the tail end, and the rest 60KVAR is transmitted to the power supply end; from this point, the first equilibrium point (80 KVAR) position is accumulated by 60KVAR +40 KVAR. This is a distinct difference from the power factor control approach in terms of the location and capacity of the compensation balance point determined by the reactive load demand local balance control approach. The compensation balance point is switched according to the power factor, if the compensation capacity of the balance point is 100KVAR, and the reactive load of the balance point is 99KVAR, the compensation capacitor cannot be put into operation, because the power factor of the balance point with 100KVAR exceeds 1, the power factor controller immediately instructs the compensation capacitor to cut off, the reciprocating switching on and off at the critical point not only influences the service life of equipment, but also generates frequent fluctuation of voltage and current for the power system. The operation can only be put into operation when the reactive load at the balance point exceeds 100 KVAR. The balance control method according to the reactive power demand is characterized in that the compensation capacitor is controlled according to the reactive power demand of the head end of the line, the reactive power compensation switching of the balance point is not influenced by a power factor, and the reactive power of the balance point can be transmitted.
The reactive energy supply and demand balancing device connected to a 10KV line in parallel comprises a common drop-out fuse, a lightning arrester, an outdoor capacitor and a core part control box of the device, wherein the control box comprises a 10KV voltage transformer, a vacuum contactor and a controller, the voltage transformer provides an operating power supply for the vacuum contactor, and simultaneously monitors the real-time voltage of a mounting point and can also be used as a voltage source for acquiring reactive load data; the vacuum contactor adopts direct current operation to improve the reliability of switching-on and switching-off; the controller is a core component in an internet of things with the cloud management machine, and has the executing functions of controlling the on-off state and the on-off state of the vacuum contactor in the box and uploading voltage information to the cloud management machine and receiving on-off instructions issued by the cloud management machine; the controller is internally provided with a narrow-band Internet of things module (the module consists of a chip and a peripheral circuit), and is characterized by long-distance deep coverage of transmission rate, reduction of cost and trouble of designing an external antenna by the built-in SIM card and the built-in antenna, small volume and low design complexity of the built-in industrial-grade chip SIM card, improvement of stability, support of butt joint of various cloud services and the like. The method is suitable for fixed nodes, small in data transmission quantity and fast in transmission, a reactive balance controller uploads data to a cloud management machine platform as a main mode, the narrowband Internet of things works under an authorized frequency spectrum, a 2G/3G/4G cellular communication technology supported by 3GPP is a new transmission mode which is concerned in the field of operation and manufacturing industry, and IOT is the internet connected between objects.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (8)
1. The method for controlling the balance of the supply and demand of the reactive energy of the internet +10KV distribution line is characterized by comprising the following steps: the cloud management machine acquires reactive load data in real time through the narrowband Internet of things, when the reactive load rises to the upper limit of the minimum compensation capacity balance point and reaches a time delay above, the cloud management machine searches the minimum compensation capacity balance point in a circuit, acquires the voltage of the corresponding balance point through the narrowband Internet of things, if the voltage accords with the time delay above the upper limit of the minimum compensation capacity balance point, the controller controls the switch-on, feeds back the switch-on state information to the cloud management machine through the narrowband Internet of things, if the reactive load further increases, when the minimum compensation capacity and the increment are increased and are superposed and are larger than the upper limit of the second balance point compensation capacity and reach a time delay above the second balance point, the cloud management machine acquires the voltage of the second balance point through the narrowband Internet of things, if the voltage accords with the switch-off state information of the first balance point through the narrowband Internet of things, the cloud management machine issues a second balance point controller switch-on instruction through the narrowband Internet of things after, and feeding back the second closing state information to the cloud management machine, so that switching with the capacity larger than the self capacity is always realized when the switching is carried out, and the switching is opposite to the switching-off.
2. The internet +10KV distribution line reactive energy supply and demand balance control method according to claim 1, wherein the method for the cloud management machine to obtain the reactive load data in real time through the narrowband internet of things is as follows: and the cloud management machine directly reads the reactive load data aiming at the line reactive power meter in a dispatching room or a transformer substation through the narrow-band Internet of things.
3. The internet +10KV distribution line reactive energy supply and demand balance control method according to claim 1, wherein the method for the cloud management machine to obtain the reactive load data in real time through the narrowband internet of things is as follows: the secondary current of a through type micro current transformer and the secondary side line voltage of a voltage transformer are sleeved in one phase of a secondary circuit of the line current transformer in a transformer substation and are respectively sent to a data acquisition device, and a cloud management machine acquires reactive load data from the data acquisition device through a narrow-band internet of things.
4. The internet +10KV distribution line reactive energy supply and demand balance control method according to claim 1, wherein the method for the cloud management machine to obtain the reactive load data in real time through the narrowband internet of things is as follows: and a secondary current of a phase outdoor open type current transformer and a secondary voltage of a voltage transformer in the control box are installed at a first reactive compensation balance point at the outlet of the 10KV distribution line and are respectively sent to a controller in the control box, and the cloud management machine acquires reactive load data from the controller through the narrow-band Internet of things.
5. The internet +10KV distribution line reactive energy supply and demand balance control method according to claim 4, characterized in that two sets of vacuum contactors can be installed in the control box, one controller is designed with two sets of control loops for acquisition, reception, transmission and narrow-band internet of things, and one set of voltage transformer is shared.
6. The method of claim 5, wherein the vacuum contactor is driven by an AC rectified and super capacitor DC power supply.
7. The method of claim 1, wherein the reactive power supply and demand balance control on the distribution line of +10KV is characterized in that the reactive load is increased to the upper limit of the compensation capacity of the balance point and above by 110% or more of the compensation capacity of the balance point.
8. The method of claim 1, wherein the delay time is 2 minutes.
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