CN116169731A - Two-time-scale voltage control method for active power distribution network - Google Patents
Two-time-scale voltage control method for active power distribution network Download PDFInfo
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- CN116169731A CN116169731A CN202211610883.9A CN202211610883A CN116169731A CN 116169731 A CN116169731 A CN 116169731A CN 202211610883 A CN202211610883 A CN 202211610883A CN 116169731 A CN116169731 A CN 116169731A
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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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
- H02J3/003—Load forecast, e.g. methods or systems for forecasting future load demand
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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
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a method for controlling voltage of an active power distribution network in two time scales, which comprises the following steps: step S1, optimizing reactive power output of a photovoltaic inverter by taking minimized network active loss as an objective function in a long time scale for a centralized level, and determining a reactive power output reference value of the photovoltaic inverter in an optimization interval; and S2, modeling the photovoltaic inverter and the complex control logic thereof by adopting a hybrid logic dynamic method according to the local controller in a short time scale, and controlling the distribution network voltage by combining the reactive output reference value and the hybrid logic. The scheme considers the communication state of the master station and the local controller, aims at a centralized level and a control framework of local level cooperation, adopts different local control logics for the inverter according to different communication working conditions, and can solve the problem of untimely voltage regulation caused by the influence of the communication working conditions.
Description
Technical Field
The invention relates to the technical field of power regulation and control, in particular to a two-time-scale voltage control method of an active power distribution network.
Background
High proportion renewable energy grid connection will become an essential feature of future power systems. The active power distribution network is an effective scheme for solving the problem of large-scale intermittent new energy grid-connected operation. Access to renewable energy sources in active distribution networks has led to a large number of inverter devices that need to be managed. Meanwhile, the advanced communication and control technology deepens the coupling between the information system and the physical system in the distribution network in the integration of the distribution network, and brings complex influence to the operation control of the distribution network. Therefore, how to manage the inverter device brought by the renewable energy grid connection based on the communication condition is an urgent problem to be solved.
Existing research manages the output of renewable energy inverters through a centralized, distributed and in-situ hierarchy. For the centralized and distributed management modes, when communication faults occur between the master station and the local controller for controlling the output of the inverter, the output of the inverter with the communication faults cannot be regulated, and serious overvoltage can be brought to the system. For the in-situ management mode, coordinated operation between inverters cannot be achieved.
The above information disclosed in the background section is only for enhancement of understanding of the background of the application and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to solve the problem that the voltage regulation is not timely due to the fact that a renewable energy inverter is easily affected by communication working conditions, and provides a two-time scale voltage control method of an active power distribution network.
In a first aspect, a technical solution provided in an embodiment of the present invention is a method for controlling voltage of two time scales of an active power distribution network, including the following steps:
step S1, optimizing reactive power output of a photovoltaic inverter by taking minimized network active loss as an objective function in a long time scale for a centralized level, and determining a reactive power output reference value of the photovoltaic inverter in an optimization interval;
and S2, modeling the photovoltaic inverter and the complex control logic thereof by adopting a hybrid logic dynamic method according to the local controller in a short time scale, and controlling the distribution network voltage by combining the reactive output reference value and the hybrid logic.
Preferably, the step S1 includes the steps of:
s11, acquiring basic information of an active power distribution network;
s12, determining an objective function of an hour level optimization problem of a centralized hierarchy, wherein the objective function is a single optimization target for minimizing the loss of a distribution network, and the expression is as follows:
where i and j are the number of the bus bar, ij is the branch from bus bar i to bus bar j, P ij,t And Q ij,t For active and reactive power on branch ij, r ij For the resistance of branch ij, V subs The voltage amplitude of the transformer substation;
s13, determining constraint conditions of a centralized hierarchy hour level voltage reactive power optimization problem;
s14, solving an objective function to obtain a reactive output reference value of the photovoltaic inverter in an optimization interval;
and S15, the local controller controls the photovoltaic inverter by adopting the reactive output reference value obtained by the optimization of the master station.
Preferably, the basic information of the active power distribution network includes: a1. a network topology; a2. the length, the model, the current limit value and the capacity limit value of the feeder line; a3. the bus number where the photovoltaic system is located, and the capacity of the photovoltaic system; a4. a master station, an on-site controller and a bus number where a sensor is located; a5. a master station, an on-site controller, a state of communication between the sensors; a6. a predicted curve of photovoltaic output versus load power at an hour scale time scale.
Preferably, the constraint condition includes: active balance constraint of linear nodes of an alternating-current power distribution network, reactive balance constraint of linear nodes of the alternating-current power distribution network, linear ohm law constraint of the alternating-current power distribution network, upper and lower limit constraint of bus voltage of the alternating-current power distribution network, feeder capacity constraint of the alternating-current power distribution network, upper and lower limit constraint of feeder current of the alternating-current power distribution network and power constraint of a photovoltaic power generation grid-connected inverter.
Preferably, step S2 includes the steps of:
when the communication between the master station and the local controller is normal, the local controller controls the photovoltaic inverter by adopting the photovoltaic inverter reactive output reference value obtained by the master station optimization;
when the communication between the master station and the local controller is abnormal, the local controller takes the photovoltaic inverter reactive output reference value obtained by the master station optimization before the communication interruption as a reference, adjusts the output of the photovoltaic inverter according to the local voltage measurement value of the bus node and the local control method, adjusts the reactive output in real time, and realizes the optimization of the power loss of the power distribution network under the normal condition of the communication and the control of the power distribution network voltage under the abnormal condition of the communication.
Preferably, the method for adjusting the output of the photovoltaic inverter according to the in-situ voltage measurement value of the bus node and the in-situ control method comprises the following specific steps:
obtaining a reactive output reference value of the photovoltaic inverter obtained by solving an optimization problem, and obtaining a bus voltage amplitude measurement value and a photovoltaic inverter active output value at the current time;
acquiring the communication state between the local controller and the master station at the current time;
depending on the local controller, when the communication between the master station and the local controller is normal, the local controller adopts the reactive output reference value of the photovoltaic inverter to control the reactive output of the photovoltaic inverter, and when the communication between the local controller and the master station is abnormal, the local controller adjusts the reactive output of the photovoltaic inverter according to the local control logic.
Preferably, the photovoltaic inverter comprises three operating states based on in-situ control logic of an in-situ controller:
state one: the reactive output is constant as a reference value;
state two: the reactive power output increases and is higher than the reference value;
state three: the reactive power output decreases and is lower than the reference value.
The invention has the beneficial effects that: the invention considers the communication state of the master station and the local controller, and aims at a control frame of the cooperation of the centralized level and the local level, generates a reactive output reference value of the renewable energy inverter on the time scale of an hour level, controls the reactive output of the inverter according to the reference value when the master station is in normal communication with the local controller on the time scale of a second level, and adjusts the reactive output of the inverter according to the real-time voltage measurement value and the reactive output reference value of the inverter before communication interruption when the master station is in abnormal communication with the local controller; the problem of untimely voltage regulation caused by the influence of communication working conditions can be solved.
The foregoing summary is merely an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more fully understood, and in order that the same or additional objects, features and advantages of the present invention may be more fully understood.
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Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures.
Fig. 1 is a flowchart of a method for controlling voltage of an active power distribution network in two time scales according to the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples, it being understood that the detailed description herein is merely a preferred embodiment of the present invention, which is intended to illustrate the present invention, and not to limit the scope of the invention, as all other embodiments obtained by those skilled in the art without making any inventive effort fall within the scope of the present invention.
Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart depicts operations (or steps) as a sequential process, many of the operations (or steps) can be performed in parallel, concurrently, or at the same time. Furthermore, the order of the operations may be rearranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figures; the processes may correspond to methods, functions, procedures, subroutines, and the like.
Examples: as shown in fig. 1, a method for controlling voltage of an active power distribution network in two time scales includes the following steps: and S1, optimizing reactive power output of the photovoltaic inverter by taking the minimized network active loss as an objective function in a long time scale for the centralized hierarchy, and determining a reactive power output reference value of the photovoltaic inverter in an optimization interval.
Specifically, step S1 includes the steps of:
s11, acquiring basic information of the active power distribution network.
Specifically, the basic information of the active power distribution network includes: a1. a network topology; a2. the length, the model, the current limit value and the capacity limit value of the feeder line; a3. the bus number where the photovoltaic system is located, and the capacity of the photovoltaic system; a4. a master station, an on-site controller and a bus number where a sensor is located; a5. a master station, an on-site controller, a state of communication between the sensors; a6. a predicted curve of photovoltaic output versus load power at an hour scale time scale.
S12, determining an objective function of an hour level optimization problem of a centralized hierarchy, wherein the objective function is a single optimization target for minimizing the loss of a distribution network, and the expression is as follows:
where i and j are the number of the bus bar, ij is the branch from bus bar i to bus bar j, P ij,t And Q ij,t For active and reactive power on branch ij, r ij For the resistance of branch ij, V subs Is the voltage amplitude of the substation.
S13, determining constraint conditions of the centralized hierarchy hour level voltage reactive power optimization problem.
Specifically, the constraint conditions include: active balance constraint of linear nodes of an alternating-current power distribution network, reactive balance constraint of linear nodes of the alternating-current power distribution network, linear ohm law constraint of the alternating-current power distribution network, upper and lower limit constraint of bus voltage of the alternating-current power distribution network, feeder capacity constraint of the alternating-current power distribution network, upper and lower limit constraint of feeder current of the alternating-current power distribution network and power constraint of a photovoltaic power generation grid-connected inverter.
S14, solving an objective function to obtain a reactive output reference value of the photovoltaic inverter in an optimization interval.
And S15, the local controller controls the photovoltaic inverter by adopting the reactive output reference value obtained by the optimization of the master station.
And S2, modeling the photovoltaic inverter and the complex control logic thereof by adopting a hybrid logic dynamic method according to the local controller in a short time scale, and controlling the distribution network voltage by combining the reactive output reference value and the hybrid logic.
Specifically, step S2 includes the following steps:
when the communication between the master station and the local controller is normal, the local controller controls the photovoltaic inverter by adopting the photovoltaic inverter reactive output reference value obtained by the master station optimization;
when the communication between the master station and the local controller is abnormal, the local controller takes the photovoltaic inverter reactive output reference value obtained by the master station optimization before the communication interruption as a reference, adjusts the output of the photovoltaic inverter according to the local voltage measurement value of the bus node and the local control method, adjusts the reactive output in real time, and realizes the optimization of the power loss of the power distribution network under the normal condition of the communication and the control of the power distribution network voltage under the abnormal condition of the communication.
Specifically, the method for adjusting the output of the photovoltaic inverter according to the in-situ voltage measurement value of the bus node and the in-situ control method comprises the following specific steps:
obtaining a reactive output reference value of the photovoltaic inverter obtained by solving an optimization problem, and obtaining a bus voltage amplitude measurement value and a photovoltaic inverter active output value at the current time;
acquiring the communication state between the local controller and the master station at the current time;
depending on the local controller, when the communication between the master station and the local controller is normal, the local controller adopts the reactive output reference value of the photovoltaic inverter to control the reactive output of the photovoltaic inverter, and when the communication between the local controller and the master station is abnormal, the local controller adjusts the reactive output of the photovoltaic inverter according to the local control logic.
Specifically, based on the in-situ control logic of the in-situ controller, the photovoltaic inverter includes three operating states:
state one: the reactive output is constant as a reference value;
state two: the reactive power output increases and is higher than the reference value;
state three: the reactive power output decreases and is lower than the reference value.
As a further illustration of the in-situ control logic of the photovoltaic inverter described in this embodiment, one can describe the proposition where δ i,t,1 、δ i,t,2 Delta i,t,3 For the introduced binary logic variable, for representing the PV inverter state, V i,t For the voltage amplitude of the busbar i,
andVis the upper and lower limits of the bus voltage amplitude.
Proposition 1: when the voltage amplitude V of the bus i i,t In the limit range, the reactive output of the inverter is constant as a reference value, and the mathematical expression of the proposition logic is as follows:
proposition 2: when the voltage amplitude V of the bus i i,t When the upper limit is exceeded, the reactive output of the inverter is lower than the reference value, and the mathematical expression of the proposition logic is as follows:
proposition 3: when the voltage amplitude V of the bus i i,t The lower limit is the lower limit, the reactive output of the inverter is higher than the reference value; the mathematical expression of its proposition logic is: [ V i,t ≤V]→[δ i,t,3 ＝1]。
Further, the logical relationship of proposition 1 can be translated into a set of linear inequalities:
further, the logical relationship of proposition 2 can be converted into a linear inequality:
further, the logical relationship of proposition 3 can be converted into a linear inequality:
further, since the inverter can be in only one output state, it can be expressed by the following equation:
δ i,t,1 +δ i,t,2 +δ i,t,3 ＝1
wherein s is a negative number which is much smaller than
V-V i,t 、/>
V (V) i,t -V; alpha is a small positive number.
The voltage state and reactive output equation of the photovoltaic inverter are as follows:
the voltage amplitude and the reactive output change are as follows:
in the method, in the process of the invention,
for in-situ regulation of the voltage amplitude of the rear bus i, deltat is the control interval of the in-situ controller, V i,t For the in-situ regulation of the voltage amplitude of the front busbar i +.>
Is a bus bari amount of decrease in voltage amplitude, +.>
The rising amount of the voltage amplitude of the bus i is the rising amount of the voltage amplitude of the bus i; />
For the in-situ regulation of the reactive output value of the back inverter +.>
Inverter reactive output reference value of kth dispatch period issued by master station to local controller,/for master station>
For the reactive output rise of the inverter, < >>
The reactive output reduction of the inverter; omega is the gain of the inverter, +.>
Sensitivity coefficient for reactive injection of bus i for voltage amplitude of bus i
The above embodiments are preferred embodiments of a method for controlling two time-scale voltage of an active power distribution network according to the present invention, and are not intended to limit the scope of the present invention, which includes but is not limited to the embodiments, and equivalent changes of shape and structure according to the present invention are all within the scope of the present invention.
Claims (7)
1. The method for controlling the voltage of the active power distribution network in two time scales is characterized by comprising the following steps of: the method comprises the following steps:
step S1, optimizing reactive power output of a photovoltaic inverter by taking minimized network active loss as an objective function in a long time scale for a centralized level, and determining a reactive power output reference value of the photovoltaic inverter in an optimization interval;
and S2, modeling the photovoltaic inverter and the complex control logic thereof by adopting a hybrid logic dynamic method according to the local controller in a short time scale, and controlling the distribution network voltage by combining the reactive output reference value and the hybrid logic.
2. The method for controlling the voltage of the active power distribution network in two time scales according to claim 1, wherein the method comprises the following steps:
the step S1 includes the steps of:
s11, acquiring basic information of an active power distribution network;
s12, determining an objective function of an hour level optimization problem of a centralized hierarchy, wherein the objective function is a single optimization target for minimizing the loss of a distribution network, and the expression is as follows:
where i and j are the number of the bus bar, ij is the branch from bus bar i to bus bar j, P ij,t And Q ij,t For active and reactive power on branch ij, r ij For the resistance of branch ij, V subs The voltage amplitude of the transformer substation;
s13, determining constraint conditions of a centralized hierarchy hour level voltage reactive power optimization problem;
s14, solving an objective function to obtain a reactive output reference value of the photovoltaic inverter in an optimization interval;
and S15, the local controller controls the photovoltaic inverter by adopting the reactive output reference value obtained by the optimization of the master station.
3. The method for controlling the voltage of the active power distribution network in two time scales according to claim 2, wherein the method comprises the following steps:
the basic information of the active power distribution network comprises: a1. a network topology; a2. the length, the model, the current limit value and the capacity limit value of the feeder line; a3. the bus number where the photovoltaic system is located, and the capacity of the photovoltaic system; a4. a master station, an on-site controller and a bus number where a sensor is located; a5. a master station, an on-site controller, a state of communication between the sensors; a6. a predicted curve of photovoltaic output versus load power at an hour scale time scale.
4. The method for controlling the voltage of the active power distribution network in two time scales according to claim 2, wherein the method comprises the following steps:
the constraint conditions include: active balance constraint of linear nodes of an alternating-current power distribution network, reactive balance constraint of linear nodes of the alternating-current power distribution network, linear ohm law constraint of the alternating-current power distribution network, upper and lower limit constraint of bus voltage of the alternating-current power distribution network, feeder capacity constraint of the alternating-current power distribution network, upper and lower limit constraint of feeder current of the alternating-current power distribution network and power constraint of a photovoltaic power generation grid-connected inverter.
5. The method for controlling the voltage of the active power distribution network in two time scales according to claim 1, wherein the method comprises the following steps:
step S2 includes the steps of:
when the communication between the master station and the local controller is normal, the local controller controls the photovoltaic inverter by adopting the photovoltaic inverter reactive output reference value obtained by the master station optimization;
when the communication between the master station and the local controller is abnormal, the local controller takes the photovoltaic inverter reactive output reference value obtained by the master station optimization before the communication interruption as a reference, adjusts the output of the photovoltaic inverter according to the local voltage measurement value of the bus node and the local control method, adjusts the reactive output in real time, and realizes the optimization of the power loss of the power distribution network under the normal condition of the communication and the control of the power distribution network voltage under the abnormal condition of the communication.
6. The method for controlling the voltage of the active power distribution network in two time scales according to claim 5, wherein the method comprises the following steps:
the method for adjusting the output of the photovoltaic inverter according to the in-situ voltage measurement value of the bus node and the in-situ control method comprises the following specific steps:
obtaining a reactive output reference value of the photovoltaic inverter obtained by solving an optimization problem, and obtaining a bus voltage amplitude measurement value and a photovoltaic inverter active output value at the current time;
acquiring the communication state between the local controller and the master station at the current time;
depending on the local controller, when the communication between the master station and the local controller is normal, the local controller adopts the reactive output reference value of the photovoltaic inverter to control the reactive output of the photovoltaic inverter, and when the communication between the local controller and the master station is abnormal, the local controller adjusts the reactive output of the photovoltaic inverter according to the local control logic.
7. The method for controlling the voltage of the active power distribution network in two time scales according to claim 6, wherein the method comprises the following steps:
based on the in-situ control logic of the in-situ controller, the photovoltaic inverter comprises three operating states:
state one: the reactive output is constant as a reference value;
state two: the reactive power output increases and is higher than the reference value;
state three: the reactive power output decreases and is lower than the reference value.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117272563A (en) * | 2023-09-25 | 2023-12-22 | 上海能优网电力科技有限公司 | Power distribution network information physical twin modeling method and system based on fusion flow model |
| CN117293807A (en) * | 2023-09-25 | 2023-12-26 | 上海能优网电力科技有限公司 | Multi-time scale optimization method and system for information side model of power distribution network |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117272563A (en) * | 2023-09-25 | 2023-12-22 | 上海能优网电力科技有限公司 | Power distribution network information physical twin modeling method and system based on fusion flow model |
| CN117293807A (en) * | 2023-09-25 | 2023-12-26 | 上海能优网电力科技有限公司 | Multi-time scale optimization method and system for information side model of power distribution network |
| CN117272563B (en) * | 2023-09-25 | 2024-04-19 | 上海能优网电力科技有限公司 | Power distribution network information physical twin modeling method and system based on fusion flow model |
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