CN116093998B - Virtual storage battery control method based on controllable load - Google Patents
Virtual storage battery control method based on controllable load Download PDFInfo
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- CN116093998B CN116093998B CN202211499991.3A CN202211499991A CN116093998B CN 116093998 B CN116093998 B CN 116093998B CN 202211499991 A CN202211499991 A CN 202211499991A CN 116093998 B CN116093998 B CN 116093998B
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000033228 biological regulation Effects 0.000 claims abstract description 19
- 238000007599 discharging Methods 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 230000008569 process Effects 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 abstract description 2
- 238000004146 energy storage Methods 0.000 description 12
- 239000003990 capacitor Substances 0.000 description 7
- 230000008859 change Effects 0.000 description 7
- 238000011217 control strategy Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000005389 magnetism Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
- H02J3/144—Demand-response operation of the power transmission or distribution network
-
- 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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a virtual storage battery control method based on controllable load. The method comprises the following steps: according to the energy conversion relation between the rotor kinetic energy of the asynchronous motor and the charging and discharging electric energy of the storage battery, a controllable load virtual storage battery model is established; calculating a virtual current value provided by the virtual storage battery according to the virtual energy relational expression description; according to the introduction of the virtual current value, controlling the reference angular speed of the asynchronous motor by adjusting the virtual current value, so that the controllable load participates in power balance; and establishing relevant parameters for evaluating the configuration capacity and the running state of the virtual storage battery according to the relation between the reference angular speed and the rated angular speed of the asynchronous motor. The invention enables the controllable load to participate in the charge-storage coordination control in the form of the virtual storage battery, takes the virtual current as a unified regulation parameter, takes the capacity of the virtual storage battery and the charge state of the virtual storage battery as an evaluation controllable load regulation performance index, and improves the operation flexibility and economy of the system.
Description
Technical Field
The invention relates to a virtual storage battery control method, in particular to a virtual storage battery control method based on controllable load, and belongs to the technical field of control.
Background
Distributed power supplies, controllable loads, and energy storage all have control potential to participate in system power regulation. Both the controllable load and the battery energy storage have control potential to participate in the system power regulation. At present, in a charge-storage coordination control strategy, the operation parameters of controllable equipment are different, such as a rotating speed signal is required for load regulation and control, and a charge state and configuration capacity are required for storage battery regulation and control, so that different equipment participate in system regulation and are relatively isolated. The system centralized control management unit lacks the operation parameters for overall perception, so that the energy reserve of the controllable equipment is difficult to estimate, and the flexibility and coordination of the controllable load and the energy storage when the controllable load and the energy storage participate in the system power adjustment are still insufficient. When dealing with the actual scenes of fluctuation of new energy output and changeable operation conditions of controllable equipment, the system resources are difficult to be effectively integrated, and the multi-element power adjustment is optimized.
Therefore, the controllable load is required to be treated with equivalent value into controllable equipment with the same operation parameters as the battery energy storage, so that the controllable resources are utilized efficiently, the charge-storage coordination control is performed rapidly and accurately, the regulation capacity and the operation state of the controllable equipment are evaluated, and the safe and economic operation level of the system is improved.
Disclosure of Invention
The invention provides a virtual storage battery control method based on controllable load.
In order to achieve the above object, the present invention provides the following solutions:
a virtual storage battery control method based on controllable load comprises the following steps:
step 101: according to the energy conversion relation between the rotor kinetic energy of the asynchronous motor and the charging and discharging electric energy of the storage battery, a controllable load virtual storage battery model is established:
in which W is Bvir (t) is virtual energy provided in the virtual battery, I Bvir (t) virtual current values provided for the controllable-load virtual battery model, J s 、ω s (t)、p n U is the rotor moment of inertia, electrical angular velocity and pole pair number of the motor B For the terminal voltage of the storage battery,a reference value for rated electric angular velocity in the motor speed regulation process;
step 102: adjusting a virtual current value to control the reference angular speed of the asynchronous motor, so that a controllable load participates in power balance;
according to the relation between the virtual current and the rotating speed, in the speed regulating range of the asynchronous motor, at the next momentCan be expressed as:
further, the method for controlling the virtual storage battery based on the controllable load further comprises step 103: according to the relation between the reference angular speed and the rated angular speed of the asynchronous motor, establishing performance parameters for evaluating the configuration capacity and the running state of the virtual storage battery: virtual battery capacity and virtual battery state of charge;
virtual state of charge (SOC) of virtual battery Bvir (t) is expressed as:
wherein omega is sn Rated for motor electric angular velocity, W Bn Energy stored at rated capacity of the virtual storage battery;
the output power of the virtual battery is expressed as:
P Bvir (t)＝U B I Bvir (t)
virtual battery capacity at Q Bvir (t) is expressed as:
wherein t is Bvir The virtual storage battery participates in the discharging time;
discharge time t of virtual storage battery Bvir Expressed as:
compared with the prior art, the technology has the following beneficial effects:
1. the invention provides the charge-storage coordination control of the virtual storage battery with controllable load, so that the resources on two sides of the supply and the demand can be integrated, and the interaction flexibility of system regulation and control is improved;
2. the invention takes the virtual current as a parameter for unified regulation and control, takes the capacity of the virtual storage battery and the charge state of the virtual storage battery as performance indexes for evaluating controllable load to be equivalent to the capacity configuration after the virtual storage battery, is convenient for unified energy storage transfer, simplifies the optimized operation, and improves the operation flexibility and economy of the system.
Description of the drawings:
FIG. 1 is a flow chart of embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of virtual battery inverter control from an asynchronous motor according to an embodiment of the present invention;
FIG. 3 is a graph of virtual current variation provided by a virtual battery according to an embodiment of the present invention;
FIG. 4 is a graph of power change of each device under a virtual battery control strategy according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating the state of charge change of each device according to the virtual battery control strategy according to the embodiment of the present invention;
fig. 6 is a graph showing the change of the discharging time length and the capacity parameter of the virtual storage battery according to the embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
the virtual storage battery control method based on the controllable load not only can evaluate the adjustment potential of the virtual storage battery with the controllable load, but also establishes related parameters for evaluating the configuration capacity and the running state of the virtual storage battery.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
The controlled system of this embodiment includes permanent magnetism direct drive wind generating set, asynchronous motor and energy memory, permanent magnetism direct drive wind generating set passes through voltage type AC/DC transverter access direct current bus, controllable load passes through AC/DC transverter access direct current bus by continuous adjustable asynchronous motor form, energy memory contains battery and supercapacitor two parts, connects direct current bus access net through two-way DC/DC transverters respectively. In the embodiment, the asynchronous motor is used as a controllable load to establish a virtual storage battery model, the virtual storage battery model of the controllable load controls the rotating speed of the rotor of the asynchronous motor by introducing a virtual current value, and the consistency of electrical parameters is convenient for achieving the unified regulation and control of each flexible device on the load-storage side.
As shown in fig. 1, a virtual storage battery control method based on controllable load includes the following steps:
step 101: according to the energy conversion relation between the rotor kinetic energy of the asynchronous motor and the charging and discharging electric energy of the storage battery, a controllable load virtual storage battery model is established:
the energy stored by the virtual battery in the full charge state can be expressed as:
W B (t)＝∫U B I B (t)dt
in the storage battery, the voltage at two ends of the storage battery is U B The charge-discharge current is I B (t)。
Rotor kinetic energy E of asynchronous motor r (t) is expressed as:
wherein J is s 、ω s (t)、p n The moment of inertia, the electrical angular velocity and the pole pair number of the asynchronous motor, respectively.
In the modeling process of the virtual storage battery, assuming the voltage of the virtual storage battery is a set value, establishing a dynamic energy relationship between the rotor kinetic energy of the asynchronous motor and the charge and discharge electric energy of the storage battery can be expressed as follows:
that is to say
In which W is Bvir (t) is virtual energy provided in the virtual battery, I Bvir (t) virtual current values provided for the controllable-load virtual battery model, J s 、ω s (t)、p n U is the rotor moment of inertia, electrical angular velocity and pole pair number of the motor B For the terminal voltage of the storage battery,a reference value for rated electric angular velocity in the motor speed regulation process;
step 102: adjusting a virtual current value to control the reference angular speed of the asynchronous motor, so that a controllable load participates in power balance;
calculating a virtual current value provided by the virtual storage battery according to the virtual energy relation;
in the method, in the process of the invention,the reference signal is a rated electric angular speed reference signal input by a speed regulator in the speed regulation process of the asynchronous motor.
According to the relation between the virtual current and the rotating speed, in the speed regulating range of the asynchronous motor, at the next moment
Can be expressed as:
FIG. 2 is a schematic diagram of the inverter control of a virtual battery derived from an asynchronous motor according to an embodiment of the present invention, wherein the virtual battery is controlled by introducing a virtual current I as shown in FIG. 2 Bvir Reference signal omega of rated electric angular velocity input by speed regulator * s Controlling asynchronous motorThe rotating speed of the device simulates the charging and discharging process of energy storage. Fig. 3 is a graph of a virtual current change provided by the virtual battery according to an embodiment of the present invention, as shown in fig. 3, the system inputs the controllable load virtual battery into the power balance at 17s, and the virtual current provided by the virtual battery is 9.63A. Fig. 4 is a power change chart of each device under the virtual battery control strategy according to the embodiment of the invention, the wind power of the system is simulated to be increased, and the power dynamic response of each electrical device is compared and analyzed when the virtual battery charging working condition exists or not. The system inputs the virtual storage battery at 17s, and shares the charging and discharging power of the super capacitor, so that the super capacitor is stably charged and discharged. If the wind speed is increased at 33s and the virtual storage battery is not put into operation, the super capacitor reaches the upper regulation limit at 47.3s, and the physical storage battery is required to be put into operation to stabilize the power fluctuation, so that the cost loss of the storage battery is increased. However, after the virtual storage battery is put into, the system power fluctuation is shared by the super capacitor and the virtual storage battery, the storage battery is hardly involved in regulation, and the system operation economy is greatly improved.
Step 103: according to the relation between the reference angular speed and the rated angular speed of the asynchronous motor, establishing performance parameters for evaluating the configuration capacity and the running state of the virtual storage battery:
and establishing parameters for evaluating the configuration capacity and the running state of the virtual storage battery according to the relation between the reference angular speed and the rated angular speed of the asynchronous motor.
According to the relevant configuration parameters of the entity storage battery, two performance indexes of the virtual storage battery capacity and the virtual storage battery charge state are considered to be introduced in order to enable the virtual storage battery to obtain the consistency parameters.
Defining the virtual state of charge SOC of the virtual storage battery from an energy perspective as the ratio of the remaining capacity to the rated capacity Bvir (t) is expressed as:
wherein omega is sn For rated electric angular velocity, W, of asynchronous motors Bn For energy stored at rated capacity of virtual accumulator, E rn For the energy of the asynchronous motor operating at the nominal rotational speed.
The virtual charge state is directly related to the rotating speed of the asynchronous motor and is used for visually observing the running state of the rotor of the asynchronous motor, namely when the SOC Bvir When the charging speed is increased, omega is increased, which is equivalent to the charging process of the virtual storage battery; when SOC is Bvir When decreasing, ω×s decreases, equivalently the battery discharging process. Fig. 5 is a diagram showing the change of the state of charge of each device under the control strategy of the virtual battery according to the embodiment of the present invention, comparing the state of charge of the super capacitor and the battery under the virtual battery, when the super capacitor reaches the limit value at 47.3s without the virtual battery, the state of charge of the battery is increased, and the loss is increased. After the virtual storage battery is put into, the charge state of the super capacitor is always maintained in an adjustable state. Because the storage battery does not participate in regulation, the state of charge remains unchanged, the service life of the storage battery is prolonged, and the economic operation of the system is facilitated. Virtual battery post-input SOC Bvir Continuously increases, when the virtual storage battery is charged to the SOC at 28.6s Bvir When=100%, the asynchronous motor speed reaches an adjustable speed limit, at which time the controllable load power is maintained at a maximum power that remains unchanged.
And obtaining a virtual storage battery capacity parameter according to rated energy output by the virtual storage battery, and representing the size of the stored electric quantity. Virtual battery capacity at Q Bvir Expressed in ampere hour (Ah), the relation is expressed as:
wherein t is Bvir And taking part in the discharging time for the virtual storage battery.
Based on the virtual battery capacity parameter for evaluating the energy reserve, the discharge time t of the virtual battery is evaluated Bvir Can be expressed as:
from deficiencyThe output power and energy of the pseudo-accumulator can obtain the participation discharging time t of the pseudo-accumulator Bvir And the stored electricity quantity Q of the virtual storage battery Bvir Characterizing the same capacity configuration parameters as the physical storage battery. Fig. 6 is a graph showing a change of a discharging time period and a capacity parameter of a virtual storage battery according to an embodiment of the present invention, where as shown in fig. 6, a charging and discharging electric quantity provided by the virtual storage battery can be obtained, and a total charging time period of the virtual storage battery is 11.6s.
The invention aims at the energy conversion relation between the rotor kinetic energy of the asynchronous motor and the charge and discharge electric energy of the storage battery to form a controllable load virtual storage battery model. According to the initial kinetic energy E of the asynchronous motor r (t) deriving energy reserve W of virtual battery Bvir (t) deriving a virtual current value I provided by the virtual battery Bvir (t) and obtaining the reference value of the required rotating speed of the rotor of the asynchronous motor at the next momentThe controllable load can actively call the rotational kinetic energy of the rotor, simulate the charging and discharging energy of the storage battery, and obtain additional energy storage reserve from the demand side, so that the energy storage device has similar power adjusting capability as the energy storage element. Since the operating parameters are the same as the physical storage battery, introducing virtual storage battery capacity parameters similar to the physical storage battery to obtain the evaluation parameters for detecting the operating state of the motor includes: virtual state of charge value SOC Bvir (t), virtual storage battery Capacity Q Bvir (t) and virtual storage battery participation discharge time period t Bvir The virtual storage battery at the moment in the model is evaluated to show the same external characteristics as the energy storage equipment, so that the control strategy can be formulated integrally. The virtual storage battery control method based on the controllable load, provided by the invention, enables the controllable load to participate in charge-storage coordination control in a virtual storage battery mode, takes the virtual current as a uniformly regulated parameter, takes the virtual storage battery capacity and the virtual storage battery charge state as performance indexes for evaluating the equivalent of the controllable load as the capacity configuration of the virtual storage battery, and improves the system operation flexibility and economy.
The invention takes the operation characteristic of the storage battery as a virtual object, and after energy conversion treatment, the asynchronous motor can obtain equivalent operation parameters, namely virtual current and virtual charge state, respectively through rotation speed adjustment, and has discharge duration and ampere-hour capacity configuration. In the virtual storage battery control mode, the operation parameters of the controllable load are similar to those of the storage battery, the system can treat the same as the storage battery, the callable energy reserves of different types of equipment in the system can be estimated only by the battery operation parameters, the integral sensing and the energy management are convenient to realize, the cooperative control strategy of the storage battery and the load is greatly simplified, and the system has remarkable practical significance for improving the regulation flexibility and the coordination of the load and the energy storage.
Claims (2)
1. The virtual storage battery control method based on the controllable load is characterized by comprising the following steps of:
step 101: according to the energy conversion relation between the rotor kinetic energy of the asynchronous motor and the charging and discharging electric energy of the storage battery, a controllable load virtual storage battery model is established:
in which W is Bvir (t) is virtual energy provided in the virtual battery, I Bvir (t) virtual current value provided for controllable load virtual storage battery model, J s 、ω s (t)、p n The rotor moment of inertia, the electrical angular velocity and the pole pair number of the motor, U B For the terminal voltage of the storage battery,a reference value for rated electric angular velocity in the motor speed regulation process;
step 102: adjusting the reference angular speed of the asynchronous motor according to the virtual current value requirement to enable the controllable load to participate in power balance;
according to the relation between the virtual current and the rotating speed, in the speed regulating range of the asynchronous motor, at the next momentCan be expressed as:
2. the method for controlling a virtual battery based on a controllable load according to claim 1, further comprising step 103: according to the relation between the reference angular speed and the rated angular speed of the asynchronous motor, establishing performance parameters for evaluating the configuration capacity and the running state of the virtual storage battery: virtual battery capacity and virtual battery state of charge;
virtual state of charge (SOC) of virtual battery Bvir (t) is expressed as:
wherein omega is sn Rated for motor electric angular velocity, W Bn Energy stored at rated capacity of the virtual storage battery;
the output power of the virtual battery is expressed as:
P Bvir (t)＝U B I Bvir (t)，
virtual battery capacity at Q Bvir (t) is expressed as:
wherein t is Bvir The virtual storage battery participates in the discharging time;
discharge time t of virtual storage battery Bvir Expressed as:
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