CN115085191A - Voltage sag control method based on user side energy storage system and related device - Google Patents
Voltage sag control method based on user side energy storage system and related device Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
- H02J3/0012—Contingency detection
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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
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/30—Reactive power compensation
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Abstract
The invention provides a voltage sag control method based on a user side energy storage system and a related device, wherein the method comprises the following steps: inputting the collected current power grid voltage data into a fault detection model, and determining whether a voltage sag fault occurs; when the voltage sag fault is determined to occur, switching the current working mode of the energy storage system at the user side into a voltage support mode through a selector; the voltage support mode representation supplies power to the load through the user side energy storage system; inputting the current power grid voltage data into a voltage control model, generating a reference current signal, and sending the reference current signal to a current control model; and generating a pulse signal through a current control model according to the reference current signal, and sending the pulse signal to an energy storage converter of a user-side energy storage system so as to enable the output current of the energy storage converter to supply power for a load. The invention can accurately realize control switching, solves the problem that the mode switching fails and the voltage cannot be compensated for the load, and realizes the multifunctional multiplexing of the energy storage system at the user side.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to a voltage sag control method based on a user side energy storage system and a related device.
Background
Voltage sag is one of the most serious power quality problems with the highest frequency of occurrence, so voltage sag treatment equipment becomes a research hotspot in the field of power quality, and a user-side energy storage system in an industrial park has the potential of voltage sag treatment but is not effectively utilized.
At present, a conventional user side energy storage system only has a peak clipping and valley filling function, when voltage sag occurs, a traditional user side energy storage converter is controlled by PQ or VF mostly, mode switching is improper easily in the control mode, overcurrent or overvoltage protection occurs to cause switching failure, load voltage cannot be compensated timely in the control mode, and the control mode does not have the voltage sag compensation function. Therefore, a fast and accurate control strategy needs to be provided for voltage sag management of the energy storage system at the user side, so as to ensure the reliability of power supply.
Disclosure of Invention
One of the objectives of the present invention is to provide a voltage sag control method and a related device based on a user-side energy storage system, so as to solve the problem that load voltage cannot be compensated timely due to inaccurate or failed mode switching in the prior art, and to implement a voltage sag management function on the basis of a conventional peak clipping and valley filling function of the user-side energy storage system, thereby implementing a multifunctional multiplexing effect.
In a first aspect, the invention provides a voltage sag control method based on a user-side energy storage system, which is applied to a controller; the controller comprises a fault detection model, a selector, a voltage control model and a current control model; the method comprises the following steps: inputting the collected current power grid voltage data into the fault detection model, and determining whether a voltage sag fault occurs; when the voltage sag fault is determined to occur, switching the current working mode of the energy storage system at the user side into a voltage support mode through the selector; the voltage support mode representation supplies power to a load through the user side energy storage system; inputting the current power grid voltage data into the voltage control model, generating a reference current signal, and sending the reference current signal to the current control model; and generating a pulse signal through the current control model according to the reference current signal, and sending the pulse signal to an energy storage converter of the user side energy storage system so as to enable the output current of the energy storage converter to supply power to the load.
In a second aspect, the present invention provides a voltage sag control device based on a user-side energy storage system, which is applied to a controller of the user-side energy storage system; the controller comprises a fault detection model, a selector, a voltage control model and a current control model; the determining module is used for inputting the collected current power grid voltage data into the fault detection model and determining whether a voltage sag fault occurs; the switching module is used for switching the current working mode of the energy storage system at the user side into a voltage supporting mode through the selector when the voltage sag fault is determined to occur; the voltage support mode representation supplies power to a load through the user side energy storage system; the generation module is used for inputting the current power grid voltage data into the voltage control model, generating a reference current signal and sending the reference current signal to the current control model; and generating a pulse signal through the current control model according to the reference current signal, and sending the pulse signal to an energy storage converter of the user side energy storage system so as to enable the output current of the energy storage converter to supply power to the load.
In a third aspect, the present invention provides a user-side energy storage system, comprising a processor and a memory, wherein the memory stores a computer program executable by the processor, and the processor executes the computer program to implement the method of the first aspect.
In a fourth aspect, the invention provides a readable storage medium having stored thereon a computer program which, when executed by a processor, performs the method according to the first aspect.
The voltage sag control method and the related device based on the energy storage system at the user side can quickly and accurately judge whether the voltage sag occurs at present or not after the voltage data of the current electric network is obtained through the fault detection model, can quickly respond through the selector once the voltage sag fault is determined to occur, switch the current working mode of the energy storage system at the user side into the voltage support mode, further generate target current information through the voltage control model and the current control model and send the target current information to the energy storage converter to timely compensate the voltage of the load, have quick and accurate whole switching process, and can accurately generate a reference current signal to supply power to the load after the mode switching, solve the problems of mode switching failure and no voltage compensation for the load in the prior art, and realize that the energy storage system at the user side has the voltage sag control function on the basis of the conventional peak load clipping function, the multifunctional multiplexing effect is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic view of a scenario provided in an embodiment of the present invention;
fig. 2 is a topology diagram of a user-side energy storage system according to an embodiment of the present invention;
FIG. 3 is a functional block diagram of a controller according to an embodiment of the present invention;
fig. 4 is a schematic flowchart of a voltage sag control method based on a user-side energy storage system according to an embodiment of the present invention;
FIG. 5 is a functional block diagram of a fault detection model provided by an embodiment of the present invention;
fig. 6 is a schematic flowchart of step S401 provided by the embodiment of the present invention;
fig. 7 is a schematic flowchart of step S402 provided by the embodiment of the present invention;
FIG. 8 is a functional block diagram of a voltage control model according to an embodiment of the present invention;
fig. 9 is a schematic flowchart of step S403 according to an embodiment of the present invention;
FIG. 10 is a possible implementation of the control provided by the embodiment of the present invention;
fig. 11 is a functional block diagram of a voltage sag control apparatus based on a user-side energy storage system according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a user-side energy storage system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
Referring to fig. 1, fig. 1 is a schematic view of a scenario provided by an embodiment of the present invention, as shown in fig. 1, the high-quality electric power park has three incoming lines, which are respectively from a 220kV KG substation, a 220kV TX substation, and a 110kV JT substation, three 110/10kV main transformers in the park have capacities of 63MVA, a 10kV bus adopts two segments, and a bus tie switch of the bus tie is closed under a normal condition. A plurality of factories exist in the garden, and the user-side energy storage system is installed in the factories.
Taking the plant 1 in fig. 1 as an example, the plant 1 has three 10/0.38kV buck transformers with capacities of 2000kVA/1600kVA/2000kVA respectively, and the three-segment buses, i.e., the bus 1, the bus 2, and the bus 3, are supplied with power respectively. The user side energy storage is directly connected with a 10kV bus, and the peak clipping and valley filling functions are achieved through the bus. A DVR is connected between the bus 3 and the distribution transformer in series, the user side energy storage system is connected with the buses 3 and 2 at the same time, and the bus 1 has no any treatment equipment.
When voltage sag occurs, the traditional user side energy storage converter is controlled by PQ or VF mostly, mode switching is improper easily in the control mode, switching failure is caused by overcurrent or overvoltage protection, and load voltage cannot be compensated in time in the control mode. Therefore, a fast and accurate control strategy needs to be provided for voltage sag management of the energy storage system at the user side, so that the reliability of power supply is ensured.
In order to enable the user side energy storage system to have the voltage sag treatment capability on the basis of the peak clipping and valley filling functions, the structure and the control strategy of the existing user side energy storage system need to be improved.
Referring to fig. 2, fig. 2 is a topological diagram of a user-side energy storage system according to an embodiment of the present invention, and as shown in fig. 2, in the embodiment of the present invention, a common DC bus is additionally disposed in the user-side energy storage system, the user-side energy storage system is connected to the DC bus through a DC/DC chopper circuit, so as to maintain the voltage stability of the common DC bus, and multiple converters are led out from the common DC bus, and each converter operates independently.
In order to realize the voltage sag control function, a high-voltage energy conversion system (short for high-voltage PCS) and a low-voltage energy conversion system (short for low-voltage PCS) can be connected to a common direct-current bus, wherein the high-voltage PCS is used for connecting 10kV voltage levels and comprises a three-phase voltage source type converter, an LCL filter, an isolation transformer, a bypass switch and an insulated gate bipolar transistor IGBT, and the low-voltage PCS is directly connected with a 400V low-voltage load.
It can be understood that the energy storage system on the user side provided by the embodiment of the invention can be connected with a plurality of sets of energy conversion systems through a common direct current bus, and the energy conversion systems can be connected with electric devices with different sensitivities, so that the effect of uniformly managing the electric devices when voltage sag occurs can be realized, the energy storage system on the user side has a voltage sag control function on the basis of a conventional peak clipping and valley filling function, the multifunctional multiplexing is realized, and the economic benefit of the energy storage system is improved.
The energy storage system at the user side provided by the embodiment of the invention can have two working modes, but is not limited to have two working modes, when the voltage of the power grid normally runs, the energy storage system at the user side works in a grid-connected mode, at the moment, the IGBT in the figure 2 is closed, and the load is supplied with power by the power grid. Under the grid-connected mode, the energy storage system at the user side can be charged and discharged to execute the peak clipping and valley filling functions.
When voltage sag occurs, the user side energy storage system is switched into a voltage support mode from a grid-connected mode, the IGBT is disconnected at the moment, and the user side energy storage system replaces a power grid to supply power to the sensitive electric equipment.
In order to solve the problems that in the prior art, mode switching is improper, switching failure is caused by overcurrent or overvoltage protection, and load voltage cannot be compensated timely, an embodiment of the invention provides a voltage sag control method based on an improved user-side energy storage system shown in fig. 2, and the method can be applied to a controller of the user-side energy storage system.
Referring to fig. 3, fig. 3 is a functional block diagram of a controller according to an embodiment of the present invention, in which the controller 110 includes a fault detection model 110-1, a selector 110-2, a voltage control model 110-3, a current control model 110-4, and a power control model 110-5.
The selector 110-2 has a first terminal and a second terminal, and the selector 110-2 is connected to the power control model 110-5 through the first terminal, or the selector 110-2 is connected to the voltage control model 110-3 through the second terminal; as shown in fig. 3, the first terminal is a, the second terminal is B, and when the selection switch of the selector 110-2 is set to a, the power control model 110-5 and the current control model 110-4 cooperatively generate a reference current signal, and the energy storage converter outputs the reference current signal to supply power to the load, which indicates that the operating mode of the energy storage system on the user side is the grid-connected mode.
When the selection switch of the selector 110-2 is set to be B, the voltage control model 110-3 and the current control model 110-4 cooperatively generate a reference current signal, and the energy storage converter outputs the reference current signal to supply power to the load.
It can be understood that, when a voltage sag occurs, the power control model 110-5 can be switched to the voltage control model 110-3 through the selector 110-2, so that the energy storage system on the user side can be quickly and accurately switched from the grid-connected mode to the voltage support mode to supplement the voltage in time.
Referring to fig. 4 in conjunction with the logic diagram of the controller shown in fig. 3, fig. 4 is a schematic flowchart of a voltage sag control method based on a user-side energy storage system according to an embodiment of the present invention, where the method includes:
s401, inputting the collected current power grid voltage data into a fault detection model, and determining whether a voltage sag fault occurs.
S402, when the voltage sag fault is determined to occur, the current working mode of the energy storage system at the user side is switched into a voltage support mode through the selector.
And the voltage support mode representation supplies power to the load through the user side energy storage system.
And S403, inputting the current power grid voltage data into the voltage control model, generating a reference current signal, and sending the reference current signal to the current control model.
And S404, generating a pulse signal through the current control model according to the reference current signal, and sending the pulse signal to an energy storage converter of the user-side energy storage system so that the output current of the energy storage converter supplies power to a load.
According to the voltage sag control method based on the energy storage system at the user side, provided by the embodiment of the invention, after the voltage data of the current electric network is obtained through the fault detection model, whether the voltage sag occurs at present can be rapidly and accurately judged, once the voltage sag fault is determined to occur, the current working mode of the energy storage system at the user side can be rapidly responded through the selector, the current working mode is switched into the voltage support mode, then the target current information is generated through the voltage control model and the current control model and is sent to the energy storage converter, the voltage compensation is carried out on the load in time, the whole switching process is rapid and accurate, a reference current signal can be accurately generated after the mode switching to supply power to the load, and the problems that the mode switching fails and the voltage cannot be compensated for the load in the prior art are solved.
The following describes steps S401 to S404 in detail.
Referring to fig. 5, fig. 5 is a functional block diagram of a fault detection model according to an embodiment of the present invention, where the fault detection model includes a coordinate transformation module, a magnitude determination module, a comparison module, and a trigger module.
The embodiment of the invention provides fault detectionThe measurement model 110-1 can acquire the three-phase voltage of the power grid in real time: u. of ga 、u gb 、u gc Then, the three-phase voltage obtains alpha and beta components through a coordinate transformation module: u. of gα 、u gβ The obtained voltage component can obtain a voltage amplitude U through an amplitude determining module αβ . Further, the voltage amplitude U is adjusted αβ The voltage amplitude U obtained by the comparison module αβ With a predetermined threshold value U thres Performing comparison when U is αβ Less than U thres And if so, determining that the voltage sag fault occurs.
Based on the structural diagram shown in fig. 5, please refer to fig. 6, fig. 6 is a schematic flowchart of step S401 provided in the embodiment of the present invention, where step S401 may include:
s401-1, inputting the current power grid voltage data into a coordinate transformation module to obtain a voltage component in the current power grid voltage data.
S401-2, inputting the voltage component to an amplitude determination module to obtain a voltage amplitude value.
S401-3, inputting the voltage amplitude value and a preset threshold value into a comparison module for size comparison, and determining whether a voltage sag fault occurs.
Whether the voltage sag fault occurs at present can be rapidly and accurately identified through the fault detection model.
Referring to fig. 7, fig. 7 is a schematic flowchart of step S402 according to an embodiment of the present invention, where step S402 may include the following steps:
step S402-1, when the voltage sag fault is determined to occur, generating a first trigger signal through a fault detection model, and sending the first trigger signal to a selector.
Step S402-2, when the selector obtains the first trigger signal, the selector switch of the selector is switched from the end connected with the power control model to the end connected with the voltage control model.
Specifically, when the selector obtains the first trigger signal, the selection switch of the selector is switched from the first terminal to the second terminal.
Please refer to the figure5, the fault detection module 110-1 further includes a trigger module, where the trigger module is configured to generate a trigger signal and send the trigger signal to the selector 110-2, so that the selector 110-2 switches the operating mode of the energy storage system on the user side, specifically, when the comparison module determines U αβ Less than U thres When the voltage control module 110-2 receives the first trigger signal, the selector 110-2 may switch the operating mode, that is, the selector switch of the selector 110-2 is switched from the end connected to the power control model 110-5 to the end connected to the voltage control model 110-3.
For example, with continued reference to fig. 2, when no voltage sag fault occurs, the selection switch of the selector 110-2 is connected to the terminal a, and the selector 110-2 turns on the power control model 110-5. When the selector 110-2 receives the first trigger signal, the selection switch of the selector 110-2 is switched from the terminal a to the terminal B, and at this time, the selector 110-2 switches on the voltage control model 110-3, thereby realizing the fast switching of the working mode of the energy storage system on the user side.
It is understood that the current operation mode in the embodiment of the present invention may be, but is not limited to, a peak clipping and valley filling mode.
In an optional embodiment, in order to avoid erroneous judgment caused by that in the fault process, the voltage is recovered for a short time under some conditions, but actually the sag is not ended at this time, the implementation of the present invention further provides a possible implementation manner, that is, the proposed method may further include:
and step a1, when the voltage sag fault is determined to disappear, generating a second trigger signal through the fault detection model, and sending the second trigger signal to the selector.
And a step a2, when the selector obtains the second trigger signal, keeping the state that the selection switch of the selector is connected to one end of the voltage control model.
Specifically, when the selector obtains the second trigger signal, the state in which the selector is kept connected to the second terminal is maintained.
And a3, when the duration of the state reaches a preset duration, switching the selection switch of the selector from one end connected with the voltage control model to one end connected with the power control model.
With continued reference to FIGS. 3 and 5, when the comparison module determines U αβ Not less than U thres When the signal output by the comparing module is 0, the signal output by the comparing module passes through the triggering module, the triggering module generates a second trigger signal (Ctrl ═ 0) and sends the second trigger signal (Ctrl ═ 0) to the selector 110-2, referring to fig. 2, after the selector 110-2 receives the second trigger signal, the state in which the selection switch of the selector 110-2 is connected to the terminal B is maintained, and when the state lasts for a preset duration (the preset duration may be, but is not limited to, 50ms), the selection switch of the selector 110-2 is switched from the terminal B to the terminal a, and at this time, the selector 110-2 switches on the power control model 110-5, so that the user-side energy storage system switches from the voltage support mode back to the grid-connected mode quickly.
That is, after it is determined that the voltage sag disappears, the energy storage system at the user side may be restored to a normal operation mode through the functional modules of the controller, for example, the normal operation mode may be, but is not limited to, a peak clipping and valley filling mode.
Referring to fig. 8, fig. 8 is a functional block diagram of a voltage control model according to an embodiment of the present invention, and the voltage control model 110-3 includes a phase-locking module, a voltage constructing module, and a current generating module.
Through the phase locking module, the real-time phase theta of the grid voltage can be obtained according to the real-time collected three-phase grid voltage, the obtained real-time phase theta of the grid voltage and the amplitude value of the grid voltage before the fault are input into the voltage construction module, so that a normal three-phase reference voltage signal before the voltage sag occurs can be generated, a reference current signal is generated through the current construction module, specifically, a dq-axis reference voltage signal is generated firstly, and the dq-axis reference current signal is generated through the PI control module.
It can be understood that, the conventional series compensation method based on "compensating for the missing voltage" is to compensate for the missing value based on the difference between the voltage before the voltage sag and the voltage after the voltage sag, the compensation method is not only large in calculation amount, but also the recovery processing process through the missing value is complex, and the scheme provided by the present application is different from the above implementation method, but a reference voltage can be constructed according to the real-time power grid voltage phase through the voltage control model, and the proposed scheme adopts a full compensation method, that is, no matter the amplitude and the phase of the voltage sag, the normal voltage before the voltage sag occurs is generated to supply power to the load, so that the complexity of the control strategy is simplified, and the method has stronger adaptability and compensation capability. This mode of operation is not available with conventional customer-side energy storage systems.
Therefore, based on the voltage control model shown in fig. 8, referring to fig. 9, fig. 9 is a schematic flow chart of step S403 provided in the embodiment of the present invention, and step S403 in the embodiment of the present invention may be executed as follows:
s403-1, inputting the current power grid voltage data into a phase locking module to obtain the phase data of the current power grid voltage.
S403-2, historical grid voltage amplitude data are obtained, phase data of the current grid voltage and the historical grid voltage amplitude data are input into a voltage construction module, and target voltage is generated.
And the historical power grid voltage amplitude data is the last recorded voltage amplitude before the voltage sag fault occurs. The target voltage is related to the voltage of the grid before the voltage sag fault occurs.
And S403-3, inputting the target voltage into the current generation module to generate a reference current signal.
In an alternative embodiment, in step S404, the current control module generates U via the PI controller according to the generated reference current signal dref And U qref After coordinate transformation, the required PWM pulse is output through Space Vector Pulse Width Modulation (SVPWM), and the PWM pulse passes through an energy storage converter of a user side energy storage system and can supply power to a load through energy conversion of the energy storage converter.
For convenience of understanding the whole implementation process, please refer to fig. 10, fig. 10 is a possible control implementation manner provided by an embodiment of the present invention, and with reference to fig. 10, the implementation manner may be understood as follows:
before voltage sag occurs, a selection switch of a selector is connected to a terminal A, a power control model is connected with a current control model through the selector, the working mode of the energy storage system on the user side is a grid-connected mode at the moment, a reference current is established by the power control model, a reference current signal is sent to the current control model based on the reference current, so that the current control model generates a pulse signal, and the pulse signal is sent to an energy storage converter to supply power to a load by using output current.
In the process, the fault detection model detects the current power grid voltage data in real time to judge the voltage sag fault, once the voltage sag fault is determined, a trigger signal (Ctrl ═ 1) is generated through a trigger, when the selector receives the trigger signal (Ctrl ═ 1), the selector is switched from the terminal a to the terminal B, the effect of switching the grid-connected mode to the voltage support mode is achieved, at the moment, the working mode of the energy storage system at the user side is the voltage support mode, the voltage control model constructs a reference voltage, a reference current is generated based on the constructed reference voltage, a reference current signal is generated and sent to the current control model, so that the current control model generates a pulse signal, and the pulse signal is sent to the energy storage converter to supply power to the load by using the output current.
When the fault detection model determines that the voltage sag fault is ended, a trigger signal (Ctrl ═ 0) is generated through the trigger, when the trigger signal (Ctrl ═ 0) is received by the selector, in order to prevent misjudgment, the selection switch is held at the terminal B, and after the holding time reaches a preset time, the selection switch is switched back to the terminal a from the terminal B, so that the effect of switching the voltage support mode to the grid-connected mode is achieved, and at the moment, the working mode of the energy storage system at the user side is the grid-connected mode, and the state of power supply by the power grid is recovered.
In an optional implementation manner, based on the user-side energy storage system provided in the embodiment of the present invention, power supplies may be performed to the electric devices with different sensitivities in a graded manner, so the method may further not include the following steps:
c1, configuring power supply level for each load according to the sensitivity of each load.
And c2, supplying power to each load in a grading way according to the power supply grade corresponding to each load.
Continuing with the example of fig. 1, L1-class electrical loads with low power quality requirements are concentrated on the bus 1, and correspond to the Q1 power supply quality class, such as a conventional lighting load. The L2-type electric loads with high power quality requirements are concentrated on the bus 2, and corresponding to the Q2 power supply quality grade, the loads are easily affected by voltage sag, and the fault shutdown of the loads can cause certain economic loss. The L3-class electrical loads with extremely high power quality requirements are concentrated on the bus 3, and corresponding to the Q3 power supply quality with the highest grade, once the loads are affected by voltage sag and shut down, the great economic loss is caused. The power supply levels for the different load types can be as shown in table 1.
TABLE 1
Based on the above grade assignment, the manner of supplying power to different types of electric devices in a graded manner may be as follows:
c2-1, when detecting that the voltage of the first bus bar drops, judging whether the voltage of the second bus bar drops, if so, starting the energy storage system at the user side to supply power. A load having a first power supply class is connected to the first bus. The second bus is connected with a load with a second power supply grade. The first power supply level is less than the second power supply level.
c2-2, when the voltage sag fault on the first bus and the second bus is detected to disappear, power is supplied through the power grid.
c2-3, when detecting that the voltage sag fault still occurs on the second bus, judging whether the voltage sag occurs on the third-level bus, if so, starting the voltage sag processing equipment, and supplying power through the voltage sag processing equipment and the user-side energy storage system. A load having a third power supply class is connected to the third bus. The second power supply level is less than the third power supply level.
It can be understood that the first-stage power supply level Q1 load on the first bus is directly provided by the upper-stage power supply, and is not connected to any voltage sag compensation device. The stage power supply can ensure the normal power supply of the load only when the main power supply does not have voltage sag. Once the external grid fails, causing a voltage sag in the incoming line, the bus 1 will follow the voltage sag. Therefore, the bus 1 is suitable for accessing electric loads insensitive to voltage sag.
On the basis of first-stage power supply, a first-stage power supply grade Q1 load on the first bus is guaranteed by a user-side energy storage system. Once the external power grid fails, the energy storage system on the user side is put into operation after detecting voltage sag, the energy storage system replaces a main power supply to supply power to a load, and after the voltage sag is finished, the energy storage system on the user side is switched into a grid-connected mode through a flexible exit mode. In most cases, the energy storage system at the user side can ensure that the load on the second bus is not affected by voltage sag, and the sensitive load is affected by voltage sag only in a very few cases, such as accidents that the energy storage system fails, or the voltage sag management mode is not timely switched due to conflict of working modes of the energy storage system, and the support time is not long due to low charge state. Therefore, the Q2 has a higher power quality level than the first power supply, and is suitable for accessing power loads sensitive to voltage sag.
The third-stage power supply is jointly guaranteed by the user side energy storage and the DVR, and under the general condition, the third-stage power supply guarantees that the load is not influenced by voltage sag by the user side energy storage system. And under the condition that the voltage sag still occurs on the second bus due to the unexpected condition of the energy storage at the user side, the DVR is put into operation to compensate the load voltage on the third bus. Therefore, the third stage power supply Q3 has higher reliability than the two power quality levels described above, and is suitable for loads that are very sensitive to voltage sag and are very important.
Based on the same inventive concept, the embodiment of the invention also provides a voltage sag control device based on the user side energy storage system, which is applied to a controller of the user side energy storage system. The controller comprises a fault detection model, a selector, a voltage control model and a current control model. Referring to fig. 11, fig. 11 is a functional block diagram of a voltage sag control device based on a user-side energy storage system according to an embodiment of the present invention, where the voltage sag control device 500 based on the user-side energy storage system includes:
the determining module 510 is configured to input the collected current grid voltage data into a fault detection model, and determine whether a voltage sag fault occurs.
And a switching module 520, configured to switch, when it is determined that the voltage sag fault occurs, a current operating mode of the energy storage system on the user side to a voltage support mode through the selector. The voltage support mode characterization provides power to the load through the user side energy storage system.
A generating module 530, configured to input the current grid voltage data into the voltage control model, generate a reference current signal, and send the reference current signal to the current control model. And generating a pulse signal through a current control model according to the reference current signal, and sending the pulse signal to an energy storage converter of a user-side energy storage system so as to enable the output current of the energy storage converter to supply power for a load.
It is to be appreciated that the determining module 510, the switching module 520, and the generating module 530 can cooperatively perform the various steps of fig. 4 to achieve the corresponding technical effect.
In an optional embodiment, the determining module 510 is specifically configured to: inputting the current power grid voltage data into the coordinate transformation module to obtain a voltage component in the current power grid voltage data; inputting the voltage component into the amplitude determination module to obtain a voltage amplitude value; and inputting the voltage amplitude value and a preset threshold value into the comparison module for magnitude comparison, and determining whether a voltage sag fault occurs.
In an alternative embodiment, the switching module 520 is specifically configured to generate a first trigger signal through the fault detection model when it is determined that the voltage sag fault occurs, and send the first trigger signal to the selector; when the selector obtains the first trigger signal, switching a selection switch of the selector from one end connected with the power control model to one end connected with the voltage control model.
In an alternative embodiment, the switching module 520 is further configured to generate a second trigger signal through the fault detection model and send the second trigger signal to the selector when it is determined that the voltage sag fault disappears; when the selector obtains the second trigger signal, keeping a state of connecting a selection switch of the selector to one end of the voltage control model; and when the duration of the state reaches a preset duration, switching the selection switch of the selector from one end connected with the voltage control model to one end connected with the power control model.
In an optional embodiment, the generating module 530 is specifically configured to: inputting the current power grid voltage data into the phase locking module to obtain phase data of the current power grid voltage; obtaining historical grid voltage amplitude data, inputting the phase data of the current grid voltage and the historical grid voltage amplitude data into the voltage construction module, and generating a target voltage; the historical power grid voltage amplitude data is the last recorded voltage amplitude before the voltage sag fault occurs; the target voltage and the voltage of the power grid before the voltage sag fault occurs; and inputting the target voltage to the current generation module to generate a reference current signal.
In an optional embodiment, the system further comprises a power supply module, configured to configure a power supply level for each load according to the sensitivity of each load; and carrying out graded power supply on each load according to the power supply grade corresponding to each load.
In an optional embodiment, the power supply module is specifically configured to, when it is detected that a voltage sag occurs in the first bus, determine whether a voltage sag occurs in the second bus, and if yes, start the user-side energy storage system to supply power; a load with a first power supply grade is connected to the first bus; a load with a second power supply grade is connected to the second bus; the first power supply level is less than the second power supply level; when the voltage sag faults on the first bus and the second bus are detected to disappear, power is supplied through the power grid; when the voltage sag fault still occurs on the second bus is detected, whether a third-level bus has voltage sag is judged, if yes, voltage sag processing equipment is started, and power is supplied through the voltage sag processing equipment and the user-side energy storage system; a load with a third power supply grade is connected to the third bus; the second power supply level is less than the third power supply level.
Referring to fig. 12, fig. 12 is a schematic structural diagram of a user-side energy storage system according to an embodiment of the present invention, and referring to fig. 12, a user-side energy storage system 100 includes a memory 120, a controller 110, and a communication interface 130, where the memory 120, the controller 110, and the communication interface 130 are electrically connected directly or indirectly to each other to implement data transmission or interaction. For example, the components may be electrically connected to each other via one or more communication buses or signal lines.
The memory 120 may be used to store software programs and modules, such as instructions/modules of the voltage sag control apparatus 500 based on the energy storage system on the user side provided by the embodiment of the present invention, which may be stored in the memory 120 in the form of software or firmware or fixed in an Operating System (OS) of the energy storage system 100 on the user side, and the controller 110 executes the software programs and modules stored in the memory 120, so as to execute various functional applications and data processing. The communication interface 130 may be used for communicating signaling or data with other node devices.
The Memory 120 may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Read-Only Memory (EPROM), an electrically Erasable Read-Only Memory (EEPROM), and the like.
The controller 110 may be an integrated circuit chip having signal processing capabilities. The controller 110 may be a general-purpose processor including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components.
It is to be understood that the configuration shown in fig. 12 is merely illustrative and that customer-side energy storage system 100 may include more or fewer components than shown in fig. 12 or may have a different configuration than shown in fig. 12. The components shown in fig. 12 may be implemented in hardware, software, or a combination thereof.
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the voltage sag control method based on the energy storage system on the user side according to any one of the foregoing embodiments. The computer readable storage medium may be, but is not limited to, various media that can store program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a PROM, an EPROM, an EEPROM, a magnetic or optical disk, etc.
It should be understood that the disclosed apparatus and method may be embodied in other forms.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.
Claims (10)
1. A voltage sag control method based on a user side energy storage system is characterized by being applied to a controller; the controller comprises a fault detection model, a selector, a voltage control model and a current control model; the method comprises the following steps:
inputting the collected current power grid voltage data into the fault detection model, and determining whether a voltage sag fault occurs;
when the voltage sag fault is determined to occur, switching the current working mode of the energy storage system at the user side into a voltage support mode through the selector; the voltage support mode representation supplies power to a load through the user side energy storage system;
inputting the current power grid voltage data into the voltage control model, generating a reference current signal, and sending the reference current signal to the current control model;
and generating a pulse signal through the current control model according to the reference current signal, and sending the pulse signal to an energy storage converter of the user side energy storage system so as to enable the output current of the energy storage converter to supply power to the load.
2. The voltage sag control method based on the user-side energy storage system according to claim 1, wherein the fault detection model comprises a coordinate transformation module, a magnitude determination module and a comparison module;
inputting the collected current power grid voltage data into the fault detection model, and determining whether a voltage sag fault occurs, including:
inputting the current power grid voltage data into the coordinate transformation module to obtain a voltage component in the current power grid voltage data;
inputting the voltage component into the amplitude determination module to obtain a voltage amplitude value;
and inputting the voltage amplitude value and a preset threshold value into the comparison module for magnitude comparison, and determining whether a voltage sag fault occurs.
3. The method of claim 1, wherein the controller further comprises a power control model;
when the voltage sag fault is determined to occur, switching the current working mode of the energy storage system at the user side into a voltage support mode through the selector, wherein the switching comprises the following steps:
when the voltage sag fault is determined to occur, generating a first trigger signal through the fault detection model, and sending the first trigger signal to the selector;
when the selector obtains the first trigger signal, switching a selection switch of the selector from one end connected with the power control model to one end connected with the voltage control model.
4. The method for voltage sag control based on a customer-side energy storage system according to claim 3, further comprising:
when the voltage sag fault is determined to disappear, generating a second trigger signal through the fault detection model, and sending the second trigger signal to the selector;
when the selector obtains the second trigger signal, keeping a state that a selection switch of the selector is connected to one end of the voltage control model;
and when the duration of the state reaches a preset duration, switching the selection switch of the selector from one end connected with the voltage control model to one end connected with the power control model.
5. The voltage sag control method based on the user-side energy storage system according to claim 1, wherein the voltage control model comprises a phase locking module, a voltage construction module and a current generation module;
inputting the current grid voltage data to the voltage control model, generating a reference current signal, and sending the reference current signal to the current control model, including:
inputting the current power grid voltage data into the phase locking module to obtain phase data of the current power grid voltage;
obtaining historical grid voltage amplitude data, inputting the phase data of the current grid voltage and the historical grid voltage amplitude data into the voltage construction module, and generating a target voltage;
the historical power grid voltage amplitude data is the last recorded voltage amplitude before the voltage sag fault occurs; the target voltage and the voltage of the power grid before the voltage sag fault occurs;
and inputting the target voltage to the current generation module to generate a reference current signal.
6. The method for voltage sag control based on a customer-side energy storage system according to claim 1, further comprising:
configuring a power supply grade for each load according to the sensitivity of each load;
and carrying out graded power supply on each load according to the power supply grade corresponding to each load.
7. The voltage sag control method based on the energy storage system at the user side according to claim 1, wherein each load is supplied with power in a grading manner according to a power supply grade corresponding to each load, and the method further comprises:
when voltage sag of the first bus is detected, judging whether voltage sag of the second bus occurs, if so, starting the energy storage system at the user side to supply power; a load with a first power supply grade is connected to the first bus; a load with a second power supply grade is connected to the second bus; the first power supply level is less than the second power supply level;
when the voltage sag faults on the first bus and the second bus are detected to disappear, power is supplied through the power grid;
when the voltage sag fault still occurs on the second bus is detected, whether voltage sag occurs on the third bus is judged, if yes, the voltage sag processing equipment is started, and power is supplied through the voltage sag processing equipment and the user side energy storage system; a load with a third power supply grade is connected to the third bus; the second power supply level is less than the third power supply level.
8. A voltage sag control device based on a user side energy storage system is characterized by being applied to a controller of the user side energy storage system; the controller includes fault detection model, selector, voltage control model, current control model, includes:
the determining module is used for inputting the collected current power grid voltage data into the fault detection model and determining whether a voltage sag fault occurs;
the switching module is used for switching the current working mode of the energy storage system at the user side into a voltage supporting mode through the selector when the voltage sag fault is determined to occur; the voltage support mode representation supplies power to a load through the user side energy storage system;
the generation module is used for inputting the current power grid voltage data into the voltage control model, generating a reference current signal and sending the reference current signal to the current control model; and generating a pulse signal through the current control model according to the reference current signal, and sending the pulse signal to an energy storage converter of the user side energy storage system so as to enable the output current of the energy storage converter to supply power to the load.
9. A user-side energy storage system, comprising a controller and a memory, the memory storing a computer program executable by the controller, the controller being executable by the controller to implement the method of any one of claims 1-7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a controller, carries out the method according to any one of claims 1-7.
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