CN114944656A - Power distribution network district energy control system and method - Google Patents
Power distribution network district energy control system and method Download PDFInfo
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- CN114944656A CN114944656A CN202210736624.4A CN202210736624A CN114944656A CN 114944656 A CN114944656 A CN 114944656A CN 202210736624 A CN202210736624 A CN 202210736624A CN 114944656 A CN114944656 A CN 114944656A
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The embodiment of the invention discloses a power distribution network district energy control system and a method, wherein the system comprises: one end of the first AC-DC conversion module is electrically connected with a three-phase line and a neutral line in the distribution and transformation circuit, and the other end of the first AC-DC conversion module is electrically connected with a direct current bus; one end of the second AC-DC current transformation module is electrically connected with the direct current bus, and the other end of the second AC-DC current transformation module is electrically connected with a three-phase line and a neutral line in the distribution and transformation circuit; the first AC-DC converter module and the second AC-DC converter module are both AC-DC bidirectional converter modules and are used for converting direct current of a direct current bus into alternating current or converting alternating current into direct current; the control module is electrically connected with the first AC-DC conversion module and the second AC-DC conversion module respectively; the control unit is used for calculating the three-phase unbalance degree of the distribution transformer area so as to control the operation state of the converter module based on the three-phase unbalance degree. The invention realizes timely and accurate automatic regulation and control of the distribution and transformation line energy of the transformer area.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a distribution network district energy control system and method.
Background
In the future, the world faces the problems of shortage of energy resources and increasingly serious environmental pollution, renewable energy sources such as wind energy and solar energy are developed unprecedentedly, the development and utilization of new energy sources are quickened in various countries, and the development of large-scale new energy source power generation, high-permeability distributed power generation and large-scale energy storage is irreversible. With the practice of energy internet conception, randomness, volatility and intermittence of new energy power generation, the stable operation of a power grid is influenced by large-scale grid connection, a power system is developed towards the forward source-grid-load-storage coordinated optimization operation, high fusion of information and electric energy is required, and an accurate, continuous, rapid and flexible regulation and control means is provided.
The electric energy router is generated by an energy internet and is used for solving the problem of high-voltage large-scale multi-port new energy grid connection.
The method has the advantages of building a clean, low-carbon, safe and efficient energy system, improving the energy clean utilization level and the operating efficiency of a power system, carrying out new development concepts, better playing the roles of source network load and storage integration and multi-energy complementation in ensuring energy safety, and actively exploring the implementation path. The method is characterized in that a park (residential area) level source network is integrated with a load storage, and a new mode of 'internet +' is applied to adjust the response capability of a load side based on new technologies such as modern information communication, big data, artificial intelligence and energy storage. The integrated construction of park (residential area) level source network load storage combining distributed power generation and flexible charging and discharging of electric vehicles (user energy storage) is developed in urban commercial areas, complexes and residential areas by relying on photovoltaic power generation, grid-connected micro-grids, charging infrastructure and the like. In areas with large industrial loads and good new energy conditions, development construction and nearby consumption of distributed power sources are supported, work such as incremental power distribution networks is combined, and building of a source network load storage integrated green power supply park is carried out. And researching a source network load storage comprehensive optimization configuration scheme and providing system balance capability.
The low-voltage distribution transformer area of the power system mostly adopts a three-phase four-wire system, and with the access of distributed power supplies and the walking of more and more high-power electrical appliances into thousands of households, the problems of three-phase imbalance, line loss, intermittent overload, low voltage and the like in the transformer area are increasingly prominent, the safe operation of distribution transformers and electric equipment is influenced, the service life of the distribution transformers is shortened, and even the distribution transformers are damaged. At present, aiming at the problems, the solution is single, and comprehensive source network load coordination technology and equipment are lacked.
In view of the above, the invention provides a power distribution network station area energy control system and method, so as to solve the problems of large three-phase load fluctuation, coexistence of high and low voltages, low operation energy efficiency and the like in a station area, and solve the problems of energy control and energy efficiency improvement which are urgently to be solved after the application of user energy storage due to intermittent user photovoltaic grid connection.
Disclosure of Invention
In view of this, the invention provides a distribution network district energy control system and method, which are used for solving the problem that single-phase, two-phase and three-phase energy of a distribution network district cannot be automatically regulated and controlled timely and accurately in the prior art. To achieve one or a part of or all of the above or other objects, the present invention provides an energy control system for distribution network, including:
one end of the first AC-DC conversion module is electrically connected with a three-phase line and a neutral line in a distribution and transformation line, and the other end of the first AC-DC conversion module is electrically connected with a direct-current bus; the first AC-DC conversion module is used for converting any single-phase, any two-phase and three-phase alternating current into direct current so as to transmit the direct current to the direct current bus; or the direct current of the direct current bus is converted into any single-phase, any two-phase and three-phase alternating current so as to transmit the alternating current to the distribution and transformation line;
one end of the second AC-DC conversion module is electrically connected with the direct-current bus, and the other end of the second AC-DC conversion module is electrically connected with a three-phase line and a neutral line in the distribution and transformation circuit; the second AC-DC conversion module is used for converting the direct current of the direct current bus into any single-phase, any two-phase and three-phase alternating current so as to transmit the alternating current to the distribution and transformation line; or the direct current bus is used for converting any single-phase, any two-phase and three-phase alternating current into direct current so as to transmit the direct current to the direct current bus;
the monitoring device is electrically connected with the distribution and transformation circuit of the transformer area and is used for detecting the electric parameters of the distribution and transformation circuit of the transformer area;
the control module is electrically connected with the first AC-DC conversion module, the second AC-DC conversion module and the monitoring device respectively; the control unit is used for calculating and obtaining three-phase unbalance degrees of the transformer area based on the electric power parameters detected and obtained by the monitoring device, and controlling the running states of the first AC-DC converter module, the second AC-DC converter module, the energy storage converter module and the photovoltaic converter module based on the three-phase unbalance degrees.
Optionally, the power distribution network station area energy control system further includes an energy storage unit;
the energy storage unit is electrically connected with the direct current bus through an energy storage current transformation module, and the direct current in the direct current bus is stored to the energy storage unit by the energy storage current transformation module according to a preset control strategy;
the energy storage converter module is connected with the control module in a controlled manner and is used for receiving the control signal sent by the control module and adjusting the running state based on the control signal.
Optionally, the power distribution network platform area energy control system further includes an autonomous photovoltaic unit;
the autonomous photovoltaic unit is electrically connected with the direct current bus through a photovoltaic conversion module; the photovoltaic conversion module is used for transmitting the direct current in the autonomous photovoltaic unit to the direct current bus to provide electric energy;
the photovoltaic conversion module is connected with the control module in a controlled manner and is used for receiving the control signal sent by the control module and adjusting the running state based on the control signal.
Optionally, the power distribution network station area energy control system further includes a dc voltage stabilizing module, and the dc voltage stabilizing module is electrically connected to the dc bus.
Optionally, the energy storage units are arranged in a modular manner; each energy storage unit is a pluggable energy storage unit.
In order to solve the technical problem, the invention provides a distribution network district energy control method, which is applied to any one of the distribution network district energy control systems, and the method comprises the following steps:
acquiring power parameters of a distribution and transformation line of a transformer area in real time;
calculating and obtaining the three-phase unbalance degree of the transformer area based on the power parameters;
determining a target control strategy based on the three-phase unbalance and a preset target three-phase unbalance;
and controlling the running states of the first AC-DC converting module, the second AC-DC converting module, the energy storage converting module and the photovoltaic converting module based on the control strategy.
Optionally, determining a target control strategy based on the three-phase imbalance and a preset target three-phase imbalance specifically includes:
determining a first control strategy as a target control strategy when the difference value between the three-phase unbalance and the target three-phase unbalance is greater than a preset value;
determining a second control strategy as a target control strategy when the difference value between the three-phase unbalance degree and the target three-phase unbalance degree is smaller than or equal to the target three-phase unbalance degree;
wherein the first control strategy is: controlling the first AC-DC converter module, the energy storage unit and the DC voltage stabilizing module to start so as to absorb the power of any one phase or a plurality of phases of three phase lines of the transformer area and control the power of each phase line of the transformer area to be equal; or the second AC-DC converter module is controlled to output power to any one phase or a plurality of phases of three phase lines of the transformer area, so that the power of each phase line of the transformer area is controlled to be equal;
or, the first control strategy is: controlling the second AC-DC converter module, the photovoltaic converter module, the autonomous photovoltaic unit and the direct-current voltage stabilizing module to start so as to output power to any one phase or a plurality of phases of three phase lines of the transformer area and control the power of each phase line of the three phase lines of the transformer area to be equal;
the second control strategy is: and controlling the first AC-DC converting module, the energy storage unit, the second AC-DC converting module, the photovoltaic converting module, the autonomous photovoltaic unit and the direct current voltage stabilizing module to be closed.
Optionally, the power parameter includes any one or more of the following: the voltage, the current, the reactive power and the active power output by the distribution and transformation line.
In order to solve the above technical problem, the present invention provides a storage medium, wherein the storage medium stores a computer program, and the computer program, when executed by a processor, implements the steps of the power distribution network region energy control method according to any one of the above.
In order to solve the above technical problem, the present invention provides an electronic device, which at least includes a memory and a processor, where the memory stores a computer program thereon, and the processor implements the steps of any one of the above power distribution network region energy control methods when executing the computer program on the memory.
The embodiment of the invention has the following beneficial effects: according to the power distribution network station area energy control system, method, storage medium and electronic equipment, the control module is adopted to monitor the three-phase unbalance degree of the station area in real time, the piece deviation condition of the three-phase unbalance degree of the station area can be timely and accurately determined, when the three-phase unbalance degree is determined to be deviated from the target three-phase unbalance degree, the large three-phase load fluctuation of the station area is indicated, and then the first AC-DC converter module or the second AC-DC converter module is controlled to timely supplement or absorb the three-phase electric energy of the station area, so that single-phase, two-phase and three-phase energy optimization and automatic regulation and control of a distribution and transformation circuit of the station area 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 described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Wherein:
fig. 1 is an architecture diagram of an energy control system of a distribution network area according to an embodiment of the present invention;
fig. 2 is an architecture diagram of an energy control system of a distribution grid area according to an embodiment of the present invention;
fig. 3 is a flow chart of power distribution grid energy control according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a power distribution network station area energy control system, as shown in fig. 1, including:
the power distribution and transformation system comprises a first AC-DC converter module 1, wherein one end of the first AC-DC converter module 1 is electrically connected with a three-phase line and a neutral line in a power distribution and transformation line, and the other end of the first AC-DC converter module is electrically connected with a direct current bus; the first AC-DC converter module 1 is configured to convert any single-phase, any two-phase, or three-phase AC power into DC power, so as to transmit the DC power to the DC bus 3; or the second AC-DC conversion module is used for converting the direct current of the direct current bus into any single-phase, any two-phase and three-phase alternating current so as to transmit the alternating current to the distribution and transformation line;
one end of the second AC-DC converting module 2 is electrically connected with the direct current bus 3, and the other end of the second AC-DC converting module 2 is electrically connected with a three-phase line and a neutral line in a distribution and transformation circuit; the second AC-DC conversion module is used for converting the direct current of the direct current bus 3 into any single-phase, any two-phase and three-phase alternating current so as to transmit the alternating current to the distribution and transformation line; or the direct current bus is used for converting any single-phase, any two-phase and three-phase alternating current into direct current so as to transmit the direct current to the direct current bus;
the monitoring device 10 is electrically connected with the distribution and transformation line of the transformer area and is used for detecting the electric power parameters of the distribution and transformation line of the transformer area;
the control module 4 is electrically connected with the first AC-DC conversion module 1, the second AC-DC conversion module 2 and the monitoring device respectively; the control unit is used for calculating and obtaining the three-phase unbalance degree of the transformer area based on the electric power parameters detected and obtained by the monitoring device, and controlling the running state of the first AC-DC converter module or the second AC-DC converter module based on the three-phase unbalance degree. In the specific implementation process, when the three-phase unbalance degree deviates from the target three-phase unbalance degree greatly, the three-phase load fluctuation of the platform area is large, so that the first AC-DC converter module can be controlled to consume/absorb excessive electric energy in the three-phase power of the platform area; or controlling the first AC-DC conversion module to supplement excessive electric energy in the three-phase power of the transformer area.
In this embodiment, both the first AC-DC converting module and the second AC-DC converting module are bidirectional converting modules.
The power distribution network station area energy control system disclosed by the invention can be used for monitoring the three-phase unbalance of the station area in real time by adopting the control module, can be used for timely and accurately determining the plate deviation condition of the three-phase unbalance of the station area, and can be used for indicating that the three-phase load fluctuation of the station area is large when the three-phase unbalance is determined to deviate from the target three-phase unbalance, so that the three-phase electric energy of the station area can be timely supplemented or absorbed by controlling the first AC-DC converting module or the second AC-DC converting module, and the optimization and automatic regulation of the single-phase, two-phase and three-phase energy of a distribution and transformation line of the station area are realized.
On the basis of the foregoing embodiment, another embodiment of the present invention provides an energy control system for a distribution network platform area, as shown in fig. 2, the energy control system for a distribution network platform area in this embodiment includes:
one side of the first AC-DC conversion module 1 is connected with a three-phase line and a neutral line of a distribution transformer 0.4kV bus; the other side is connected with a direct current bus 3; the first AC-DC converting module 1 is further connected to the control module 4 in a controlled manner, and the first AC-DC converting module 1 is configured to receive a control signal sent by the control module 4 and adjust an operating state based on the control signal. In this embodiment, the functions and functions of the first AC-DC converter module include: (1) converting any single-phase alternating current of a 0.4kV system bus into direct current; one side of the first AC-DC conversion module 1 is connected with a three-phase and neutral point of a 0.4kV bus, and electric energy can be obtained from a distribution network bus AN or BN or CN through power electronic parts (such as IGBT and silicon controlled rectifier) of the first AC-DC conversion module and is converted into direct current; (2) any two-phase alternating current of a 0.4kV system bus is converted into direct current; one side of the first AC-DC conversion module 1 is connected with a three-phase and neutral point of a 0.4kV bus, and electric energy can be obtained from an AB or BC or CA of a distribution network bus through power electronic components (such as IGBT and silicon controlled rectifier) of the first AC-DC conversion module and is converted into direct current; (3) and converting the three-phase alternating current of the 0.4kV bus into direct current.
One side of the second AC-DC conversion module 2 is connected with a three-phase line and a neutral line of a distribution transformer 0.4kV bus; the other side is connected with a direct current bus 3; the second AC-DC converter module 2 is connected to the control module 4 in a controlled manner, and the second AC-DC converter module 2 is configured to receive a control signal sent by the control module 4 and adjust an operating state based on the control signal. The functions and functions of the second AC-DC conversion module comprise: (1) electric energy is obtained from the direct current bus 3 and converted into any phase of alternating current to provide a support power supply for a corresponding phase of the bus; (2) electric energy is obtained from the direct current bus 3 and converted into any two-phase alternating current to provide a support power supply for two phases corresponding to the bus; (3) electric energy is obtained from the direct current bus 3, and the electric energy is converted into three-phase alternating current to provide a support power supply for two phases corresponding to the bus.
The energy storage unit 5 is electrically connected with the direct current bus 3 through an energy storage converter module 6, and the direct current in the direct current bus 3 is stored in the energy storage unit 5 through the energy storage converter module 6; the energy storage converter module 6 is connected with the control module 4 in a controlled manner, and the energy storage converter module 6 is used for receiving the control signal sent by the control module 4 and adjusting the running state based on the control signal. In the implementation benefit, by arranging the energy storage current transformation module and the energy storage unit, redundant electric energy in the distribution and transformation line can be stored under the condition that the electric energy in the distribution and transformation line is more, so that the redundant electric energy in the distribution and transformation line is absorbed, the three-phase unbalance degree of the distribution and transformation line is consistent with the target three-phase unbalance degree, and the load fluctuation of the distribution and transformation line is reduced. In this embodiment, the energy storage and conversion module may be a bidirectional DC-DC converter. Therefore, the energy storage converter module can obtain a direct current power supply from the direct current bus 3, regulate the voltage and charge the energy storage unit 5 according to the control signal sent by the control module, or obtain the direct current power supply from the energy storage unit 5, regulate the voltage and provide energy for the direct current bus.
The autonomous photovoltaic unit 7 is an autonomous photovoltaic converter and is electrically connected with the direct current bus 3 through a photovoltaic converter module 8; the photovoltaic conversion module 8 is used for transmitting the direct current in the autonomous photovoltaic unit 7 to the direct current bus to provide electric energy; the photovoltaic conversion module 8 is connected with the control module 4 in a controlled manner, and the photovoltaic conversion module 8 is configured to receive a control signal sent by the control module 4 and adjust an operation state based on the control signal. In this implementation, the autonomous photovoltaic unit 7 has the following functions: the solar energy is converted into electric energy, and the electric energy is converged into the direct current bus 3 through the photovoltaic current conversion module 8 to provide electric energy for the direct current bus. That is, the photovoltaic converter module obtains electric energy from the autonomous photovoltaic unit 7 according to the control signal sent by the control module, and the electric energy is transmitted to the direct current bus after voltage regulation. In the embodiment, the photovoltaic converter module and the autonomous photovoltaic unit/autonomous photovoltaic converter 7 are arranged, so that the electric energy in the distribution line can be supplemented under the condition of less electric energy in the distribution line, namely, the autonomous photovoltaic unit 7 supplies the electric energy to the direct current bus 3 through the photovoltaic converter module, the three-phase unbalance degree of the distribution line can be kept consistent with the target three-phase unbalance degree, and the load fluctuation of the distribution line is reduced.
In a specific implementation process of the present embodiment, the power distribution network station area energy control system further includes: and the direct current voltage stabilizing module 9 is electrically connected with the direct current bus 3. In the specific implementation process of the energy storage device, the arrangement mode of the energy storage units is a modular arrangement mode; each energy storage unit is a pluggable energy storage unit. Through setting up direct current voltage stabilization module in this implementation, can stabilize the voltage amplitude of direct current generating line 3, eliminate power ripple etc..
The monitoring device in this embodiment specifically includes a current monitoring device and a voltage monitoring device, which are respectively used for monitoring the current and the voltage of the distribution and transformation line of the transformer area, that is, the power parameter is obtained through monitoring.
In this embodiment, the functions and functions of the control module 4 include: (1) calculating to obtain three-phase unbalance degrees based on distribution transformer output voltage, current, reactive power, active power and the like detected and obtained by a monitoring device; (2) the first AC-DC conversion module is controlled to convert any single-phase, any two-phase and any three-phase alternating current into direct current; (3) controlling the energy storage conversion module to enable the direct current bus to charge the energy storage unit through the energy storage conversion module; (4) controlling the photovoltaic converter module to enable the autonomous photovoltaic converter/autonomous photovoltaic unit to provide electric energy to the direct-current bus; (5) and controlling a second AC-DC converter module to convert the direct current of the direct current bus into any single-phase, any two-phase and any three-phase alternating current power supply to be converged into the system alternating current bus.
In the embodiment of the invention, when the control module 4 monitors and finds that the operation of the distribution network area deviates from a control target, namely three-phase imbalance, network loss, electric energy quality, overload, power direction or combination of a plurality of control targets, the control module controls the active power and the reactive power of one phase (A phase, B phase and C phase) or a plurality of phases (AB phase, BC phase, AC phase and ABC phase) of the adaptive AC-DC conversion grid-connected module/the first AC-DC conversion module 1, controls the active power and the reactive power of the energy storage unit 5 and the energy storage conversion module 6 and controls the active power of the autonomous photovoltaic unit 7 and the photovoltaic conversion module 8, and feeds back the active power and the reactive power required by one phase or a plurality of phases of the distribution area to the power network through the adaptive AC-DC conversion grid-connected module/the second AC-DC conversion module 2 to realize three-phase imbalance, low voltage and high-voltage distribution network, Active and reactive power optimization control is carried out, the operation efficiency of the distribution transformer area is improved, the power supply quality of the distribution transformer area is guaranteed, the network loss of the distribution transformer area is reduced, and the distribution transformer area operates in the optimal state. The invention uses the three-phase four-wire system power supply mode of the distribution network area and the characteristics of single-phase load and power access, takes each phase as an independent power supply, and adopts a plurality of grid-connected ports to realize the comprehensive control and optimization of the electric energy of the distribution network area. The comprehensive control and optimization system for the electric energy of the multiple grid-connected ports of the distribution network area has self-consumption, realizes the automatic optimization and control of single-phase, two-phase and three-phase energy of the distribution and transformation area, improves the energy efficiency, and transmits redundant electric quantity to a power grid. The problems of large three-phase load fluctuation, coexistence of high and low voltages, low operation energy efficiency and the like in a platform area are solved, and the problems of energy control and energy efficiency improvement which need to be solved urgently after the user energy storage application and the charging pile are connected are solved by the intermittent user photovoltaic grid connection.
In a specific implementation process of this embodiment, the AC-DC converting module may adopt a bidirectional converting module, and the DC-DC converting module may also adopt a bidirectional converting module, so that one AC-DC converting module and one DC-DC converting module are adopted in this embodiment.
Another embodiment of the present invention provides a method for controlling distribution network station area energy, as shown in fig. 3, specifically including the following steps:
step S101, acquiring power parameters of a distribution and transformation line of a transformer area in real time;
step S102, calculating and obtaining three-phase unbalance of the transformer area based on the power parameters;
step S103, determining a target control strategy based on the three-phase unbalance and a preset target three-phase unbalance;
and step S104, controlling the running states of the first AC-DC converting module, the second AC-DC converting module, the energy storage converting module and the photovoltaic converting module based on the control strategy.
In a specific implementation process of this embodiment, the determining a target control strategy based on the three-phase imbalance degree and a preset target three-phase imbalance degree specifically includes: determining a first control strategy as a target control strategy when the difference value between the three-phase unbalance and the target three-phase unbalance is greater than a preset value; determining a second control strategy as a target control strategy when the difference between the three-phase unbalance and the target three-phase unbalance is less than or equal to the target three-phase unbalance; wherein the first control strategy is: the first AC-DC conversion module, the energy storage unit and the direct current voltage stabilizing module are controlled to be started so as to absorb the power of any one phase or a plurality of phases of three phase lines in the transformer area and control the power of each phase line in the transformer area to be equal; or the second AC-DC converting module is controlled to output power to any one phase or a plurality of phases of the three phase lines of the transformer area, so that the power of each phase line of the transformer area is controlled to be equal. For example, when the cell voltage exceeds + U bj When the power is higher than the preset value, the output is stopped, and the power absorption of the transformer area is stopped when the storage upper limit of the energy storage unit is reached; when Pa- (Pa + Pb + Pc)/3 is less than or equal to 0, Pb- (Pa + Pb + Pc)/3 is less than or equal to 0 and Pc- (Pa + Pb + Pc)/3 is more than or equal to 0, absorbing the C-phase power of the platform area, wherein the absorbed power is Pc- (Pa + Pb + Pc)/3, and after absorbing the C-phase power, evenly injecting power into A, B two-phase phases of the platform area, wherein the injected power is (Pa + Pb + Pc)/3-Pa, (Pa + Pb + Pc)/3-Pb, and the other phases are similar; when Pa- (Pa + Pb + Pc)/3 is less than or equal to 0, Pb- (Pa + Pb + Pc)/3 is more than or equal to 0, and Pc- (Pa + Pb + Pc)/3 is more than or equal to 0, the power of the B phase and the C phase of the absorption platform area is Pb- (Pa + Pb + Pc)/3, and Pc- (Pa + Pb + Pc)/3 respectively. Absorbing B, C phase power and injecting power into the phase A of the transformer area, wherein the injection power is (Pa + Pb + Pc)/3-Pa, and the other two phases are combined similarly. When being + U bj % is the upper limit value of the voltage deviation specified by the national standard. Where Pa represents a phase a power, where Pb represents a phase B power, and where Pc represents a phase C power.
Or, the first control strategy is: controlling the second AC-DC converter module, the photovoltaic converter module, the autonomous photovoltaic unit and the DC voltage stabilizing module to start so as to output power to any one or more phases of three phase lines of the transformer areaThe power of each phase line in the three phase lines of the console area is equal; for example, when the cell voltage exceeds + U bj％ When the power is not output, stopping outputting power to the distribution room; when Pa is not less than Pb and not more than Pc, injecting power into the A, B phase, wherein the injected power is Pc-Pa and Pc-Pb, and the other phases are similar; and when Pa is less than or equal to Pb which is equal to Pc, injecting power into the phase A of the platform area, wherein the injection power is as follows: Pc-Pa, the other phases are similar;
the second control strategy is: and controlling the first AC-DC converting module, the energy storage unit, the second AC-DC converting module, the photovoltaic converting module, the autonomous photovoltaic unit and the direct current voltage stabilizing module to be closed.
In the embodiment, the system coordinately controls the converter unit module, the energy storage unit module, the autonomous photovoltaic unit module and the voltage stabilizing module according to the issued control strategy, absorbs the power of the transformer area or injects power into the transformer area, coordinates the active power and the reactive power of the transformer area, and controls the three-phase unbalance of the transformer area within a target range. When the three-phase unbalance degree of the transformer area does not deviate from the control target, the system closes the converter unit module, the energy storage unit module is controlled to absorb active storage electric energy emitted by the autonomous photovoltaic unit module, and by adopting the method in the embodiment, the system can absorb active and reactive power of a certain phase (A phase, B phase and C phase) or a plurality of combinations (AB phase, BC phase, AC phase and ABC phase) of the transformer area, or input a certain phase (A phase, B phase and C phase) or a plurality of combinations (AB phase, BC phase, AC phase and ABC phase) of the transformer area to achieve the three-phase unbalance optimization control target of the transformer area.
According to the embodiment of the invention, the control module is adopted to monitor the three-phase unbalance of the transformer area in real time, the sheet deviation condition of the three-phase unbalance of the transformer area can be timely and accurately determined, when the three-phase unbalance is determined to deviate from the target three-phase unbalance, the large three-phase load fluctuation of the transformer area is indicated, and further, the first AC-DC converter module or the second AC-DC converter module is controlled to timely supplement or absorb the three-phase electric energy of the transformer area, so that the single-phase, two-phase and three-phase energy optimization and automatic regulation of the transformer area distribution line are realized.
The control method is simple and reliable, and only the corresponding switch needs to be closed after the single-phase earth fault phase of the system is determined, so that the problems of large error, poor compensation precision and poor compensation effect under the complex control methods of measuring system parameters and changing the voltage of the compensator in real time to ensure the compensation effect in the current full compensation technology are solved. And the system power supply reliability and safety can be improved, the complete compensation of the voltage and the current of a fault point is realized under the single-phase earth fault of a non-effective earth system, the power grid system can continuously supply power, the power supply reliability is improved, no electric arc occurs, no human body electric shock risk exists, and the power supply safety is improved. And is easy to implement and low in cost. In the technical scheme provided by the invention, a complex power electronic converter power supply is not needed, the control is extremely simple, and compared with the current full compensation technical scheme, the hardware cost and the research and development cost are lower.
Another embodiment of the present invention provides a storage medium, where the storage medium stores a computer program, and the computer program, when executed by a processor, implements the following steps of a power distribution network region energy control method:
step one, acquiring power parameters of a distribution and transformation line of a transformer area in real time;
calculating and obtaining the three-phase unbalance degree of the transformer area based on the power parameters;
step three, determining a target control strategy based on the three-phase unbalance and a preset target three-phase unbalance;
and fourthly, controlling the running states of the first AC-DC converting module, the second AC-DC converting module, the energy storage converting module and the photovoltaic converting module based on the control strategy.
The specific implementation process of the above method steps can be referred to in the above embodiments of any power distribution network region energy control method, and details are not repeated here in this embodiment.
The storage medium provided by the invention can be used for monitoring the three-phase unbalance of the transformer area in real time by adopting the control module, can timely and accurately determine the sheet deviation condition of the three-phase unbalance of the transformer area, and indicates that the three-phase load fluctuation of the transformer area is large when the three-phase unbalance is determined to deviate from the target three-phase unbalance, so that the three-phase electric energy of the transformer area can be timely supplemented or absorbed by controlling the first AC-DC converter module or the second AC-DC converter module, and single-phase, two-phase and three-phase energy optimization and automatic regulation and control of a transformer area distribution circuit are realized.
Another embodiment of the present invention provides an electronic device, at least including a memory and a processor, where the memory stores a computer program thereon, and the processor, when executing the computer program on the memory, implements the following steps of a power distribution grid energy control method:
step one, acquiring power parameters of a distribution and transformation line of a transformer area in real time;
calculating and obtaining the three-phase unbalance degree of the transformer area based on the power parameters;
step three, determining a target control strategy based on the three-phase unbalance and a preset target three-phase unbalance;
and fourthly, controlling the running states of the first AC-DC converting module, the second AC-DC converting module, the energy storage converting module and the photovoltaic converting module based on the control strategy.
The specific implementation process of the above method steps can be referred to in the above embodiments of any power distribution network region energy control method, and details are not repeated here in this embodiment.
The electronic equipment provided by the invention can timely and accurately determine the sheet deviation condition of the three-phase unbalance of the transformer area by adopting the control module to monitor the three-phase unbalance of the transformer area in real time, and indicates that the three-phase load fluctuation of the transformer area is large when the three-phase unbalance is determined to deviate from the target three-phase unbalance, so that the three-phase electric energy of the transformer area can be timely supplemented or absorbed by controlling the first AC-DC converting module or the second AC-DC converting module, and single-phase, two-phase and three-phase energy optimization and automatic regulation of a transformer area distribution circuit are realized.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (10)
1. A distribution network plot energy control system, comprising:
one end of the first AC-DC conversion module is electrically connected with a three-phase line and a neutral line in a distribution and transformation line, and the other end of the first AC-DC conversion module is electrically connected with a direct-current bus; the first AC-DC conversion module is used for converting any single-phase, any two-phase and three-phase alternating current into direct current so as to transmit the direct current to the direct current bus; or the direct current of the direct current bus is converted into any single-phase, any two-phase and three-phase alternating current so as to transmit the alternating current to the distribution and transformation line; one end of the second AC-DC conversion module is electrically connected with the direct-current bus, and the other end of the second AC-DC conversion module is electrically connected with a three-phase line and a neutral line in the distribution and transformation circuit; the second AC-DC conversion module is used for converting the direct current of the direct current bus into any single-phase, any two-phase and three-phase alternating current so as to transmit the alternating current to the distribution and transformation line; or the direct current bus is used for converting any single-phase, any two-phase and three-phase alternating current into direct current so as to transmit the direct current to the direct current bus;
the monitoring device is electrically connected with the distribution and transformation circuit of the transformer area and is used for detecting the electric power parameters of the distribution and transformation circuit of the transformer area;
the control module is electrically connected with the first AC-DC conversion module, the second AC-DC conversion module and the monitoring device respectively; the control unit is used for calculating and obtaining three-phase unbalance of the transformer area based on the power parameters detected and obtained by the monitoring device, and controlling the running states of the first AC-DC converter module, the second AC-DC converter module, the energy storage converter module and the photovoltaic converter module based on the three-phase unbalance.
2. The distribution network bay energy control system of claim 1, wherein the system further comprises an energy storage unit;
the energy storage unit is electrically connected with the direct current bus through an energy storage current transformation module, and the direct current in the direct current bus is stored to the energy storage unit by the energy storage current transformation module according to a preset control strategy;
the energy storage converter module is connected with the control module in a controlled manner and is used for receiving the control signal sent by the control module and adjusting the running state based on the control signal.
3. The distribution network bay energy control system of claim 1, wherein the system further comprises an autonomous photovoltaic unit;
the autonomous photovoltaic unit is electrically connected with the direct current bus through a photovoltaic conversion module; the photovoltaic conversion module is used for transmitting the direct current in the autonomous photovoltaic unit to the direct current bus to provide electric energy;
the photovoltaic conversion module is connected with the control module in a controlled manner and is used for receiving the control signal sent by the control module and adjusting the running state based on the control signal.
4. The distribution network bay energy control system of claim 1, further comprising a dc voltage regulation module electrically coupled to the dc bus.
5. The distribution network bay energy control system of claim 1, wherein the energy storage units are arranged in a modular arrangement; each energy storage unit is a pluggable energy storage unit.
6. A distribution network district energy control method applied to the distribution network district energy control system according to any one of claims 1 to 5, the method comprising:
acquiring power parameters of a distribution and transformation line of a transformer area in real time;
calculating and obtaining the three-phase unbalance degree of the transformer area based on the power parameters;
determining a target control strategy based on the three-phase unbalance and a preset target three-phase unbalance;
and controlling the running states of the first AC-DC converting module, the second AC-DC converting module, the energy storage converting module and the photovoltaic converting module based on the control strategy.
7. The distribution network station area energy control method according to claim 6, wherein the determining a target control strategy based on the three-phase imbalance degree and a preset target three-phase imbalance degree specifically comprises:
determining a first control strategy as a target control strategy when the difference value between the three-phase unbalance degree and the target three-phase unbalance degree is larger than a preset value;
determining a second control strategy as a target control strategy when the difference between the three-phase unbalance and the target three-phase unbalance is less than or equal to the target three-phase unbalance;
wherein the first control strategy is: controlling the first AC-DC converter module, the energy storage unit and the DC voltage stabilizing module to start so as to absorb the power of any one phase or a plurality of phases of three phase lines of the transformer area and control the power of each phase line of the transformer area to be equal; or the second AC-DC conversion module is controlled to output power to any one phase or a plurality of phases of the three phase lines of the transformer area, so as to control the power of each phase line of the transformer area to be equal; or, the second AC-DC converter module, the photovoltaic converter module, the autonomous photovoltaic unit, and the DC voltage stabilizing module are controlled to start to output power to any one or more phases of the three phase lines of the transformer area, so as to control the power of each phase line of the three phase lines of the transformer area to be equal;
the second control strategy is as follows: and controlling the first AC-DC conversion module, the energy storage unit, the second AC-DC conversion module, the photovoltaic conversion module, the autonomous photovoltaic unit and the direct current voltage stabilizing module to be closed.
8. The distribution network district energy control method of claim 6 wherein the power parameters include any one or more of: the voltage, the current, the reactive power and the active power output by the distribution and transformation line.
9. A storage medium, characterized in that the storage medium stores a computer program, which when executed by a processor implements the steps of the distribution network bay energy control method according to any of the preceding claims 6 to 8.
10. An electronic device, characterized by at least comprising a memory, a processor, a computer program stored on the memory, and the processor, when executing the computer program on the memory, implementing the steps of the power distribution grid energy control method according to any of the preceding claims 6-8.
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| CN116667494A (en) * | 2023-06-07 | 2023-08-29 | 深圳市正浩创新科技股份有限公司 | Power supply circuit and energy storage device |
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