CN117353429A - Online nuclear capacity system and method based on power management control - Google Patents
Online nuclear capacity system and method based on power management control Download PDFInfo
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- CN117353429A CN117353429A CN202311639324.5A CN202311639324A CN117353429A CN 117353429 A CN117353429 A CN 117353429A CN 202311639324 A CN202311639324 A CN 202311639324A CN 117353429 A CN117353429 A CN 117353429A
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- 238000007599 discharging Methods 0.000 claims abstract description 62
- 238000005259 measurement Methods 0.000 claims abstract description 28
- 210000002569 neuron Anatomy 0.000 claims description 37
- 239000000178 monomer Substances 0.000 claims description 31
- 238000013528 artificial neural network Methods 0.000 claims description 17
- 230000004913 activation Effects 0.000 claims description 13
- 230000000737 periodic effect Effects 0.000 claims description 13
- 238000012544 monitoring process Methods 0.000 claims description 12
- 230000009466 transformation Effects 0.000 claims description 10
- 230000010354 integration Effects 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 claims description 3
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- 239000003990 capacitor Substances 0.000 description 4
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- 230000010363 phase shift Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
- H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
Abstract
The invention discloses an online capacity checking system and method based on power management control, which belongs to the technical field of battery management systems, wherein the system comprises: the system comprises a power supply main control module, a discharging nuclear capacity module and a battery measurement acquisition module, wherein the method is an online nuclear capacity method correspondingly arranged by the system; the invention realizes the safety management and charge-discharge protection of the battery pack to be tested of the discharge nuclear capacity, and realizes the feedback of the discharged electric energy to the power grid, thereby solving the problems of complex discharge nuclear capacity mode, lack of battery protection and waste of discharged electric energy.
Description
Technical Field
The invention belongs to the technical field of battery management systems, and particularly relates to an online capacity checking system and method based on power management control.
Background
The discharging core capacity of the traditional battery adopts a mode of externally connecting a discharging instrument with a high-power energy consumption resistor, and each time the discharging core capacity is discharged, a pole connection wire of each battery is connected to the discharging instrument by a lead with a safety function, two large cables are also required to be connected to two poles of the battery pack, and the discharging core capacity of the resistor battery has the advantages of large workload, low efficiency, high cost and low safety. Meanwhile, as the process data of the discharge nuclear capacity is stored in the discharge instrument and needs to be processed independently, a plurality of connecting wires still need to be removed after the experiment is finished, and the heat generated on site is also very large, the conventional discharge nuclear capacity mode seriously affects the daily maintenance and safety management of the battery pack, and the waste of releasing electric energy is also caused.
Disclosure of Invention
Aiming at the defects in the prior art, the online nuclear capacity system and the online nuclear capacity method based on the power management control provided by the invention realize the safety management and the charge-discharge protection of the battery pack to be tested of the discharge nuclear capacity and realize the feedback power grid to the discharged electric energy through the power main control module, the discharge nuclear capacity module and the battery measurement acquisition module, and solve the problems of complex discharge nuclear capacity mode, lack of battery protection and electric energy waste release in the prior art.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
in one aspect, the present invention provides an online capacity checking system based on power management control, which includes:
the power supply main control module is used for measuring power grid data, transmitting a second discharging nuclear capacity control signal to perform precharge or discharging switching management, controlling the grid-connected inverter to discharge according to a discharging nuclear capacity period signal of the matched power grid data and integrating the grid-connected inverter into a feedback power grid;
the discharging nuclear capacity module is used for receiving the first discharging nuclear capacity control signal transmitted by the direct current screen charging module and/or the second discharging nuclear capacity control signal transmitted by the remote monitoring equipment through the power supply main control module, and pre-charging or discharging the nuclear capacity of the battery pack to be tested;
the battery measurement acquisition module is used for receiving the first discharge nuclear capacity control signal transmitted by the direct current screen charging module and/or the second discharge nuclear capacity control signal transmitted by the remote monitoring equipment through the power supply main control module, performing balanced activation control on a plurality of battery packs to be tested, measuring discharge nuclear capacity data of each storage battery monomer, and displaying the discharge nuclear capacity data of each storage battery monomer to the direct current screen charging module.
The beneficial effects of the invention are as follows: according to the online nuclear capacity system based on power management control, the power supply main control module is used for measuring power grid data, and carrying out precharge or discharge switching management by sending the second discharge nuclear capacity signal, and the grid-connected inverter can be controlled to feed back the electric energy released by the discharge nuclear capacity to the power grid in a grid-connected manner, so that the battery pack to be tested is protected from being impacted by excessive current through precharge, and the electric energy generated by the discharge nuclear capacity is fed back and reused, and the waste of the electric energy is avoided; the discharge switching control of the tested battery pack is realized through the discharge nuclear capacity module; the balanced activation control of all the storage batteries in the tested battery pack is realized through the battery measurement acquisition module, so that all the storage batteries can be independently controlled to be added into the discharging nuclear capacity process, and the discharging nuclear capacity data of all the storage battery monomers in all the tested battery packs are respectively acquired; the invention has the advantages of simple structure, accurate control, green and environment-friendly performance, avoids the waste of electric energy resources, realizes the safe management of the discharge nuclear capacity, and simultaneously, integrates the high-efficiency feedback of the generated electric energy into a power grid.
Further, the power supply main control module includes:
the power grid measurement submodule is used for acquiring voltage data and current data with phase and frequency characteristics in a power grid;
the switching control submodule is used for receiving a second discharge nuclear capacity control signal of the remote monitoring equipment, transmitting the second discharge nuclear capacity control signal to the discharge nuclear capacity module and the battery measurement acquisition module, and controlling a contactor and a breaker in the discharge nuclear capacity module so as to realize precharge or discharge switching management of the battery pack to be tested;
and the nuclear capacity period sub-module is used for matching the measured power grid data to obtain a discharge nuclear capacity period signal for discharging the grid-connected inverter and feeding back the grid to the grid.
Further, the discharging nuclear capacity module comprises a DJ circuit sub-module and a PWM control sub-module;
the DJ circuit submodule comprises a contactor, a first resistor, a first diode and a breaker;
the cathode of the first diode, one end of a normally closed node NC of the contactor and one end of a normally open node NO are all externally connected with the anode of the direct current screen charging module; the other end of the normally open node NO of the contactor is connected with one end of the first resistor; the other end of the normally closed node NC of the contactor is respectively connected with the other end of the first resistor, the first movable end of the circuit breaker and the positive electrode of the first diode, and is externally connected with the positive electrode of the battery pack to be tested; the second movable end of the circuit breaker is externally connected with the negative electrode of the direct current screen charging module and the negative electrode of the battery pack to be tested; the first fixed end and the second fixed end of the circuit breaker are externally connected with a grid-connected nuclear-capacitance inverter;
the PWM control submodule is used for receiving the first discharge nuclear capacity control signal and/or the second discharge nuclear capacity control signal, and precharging or discharging the nuclear capacity of the tested battery pack through the connection and disconnection of a normally closed node NC and a normally open node NO of the control contactor and a circuit breaker.
Further, the battery pack to be tested is a sectional type storage battery and comprises a plurality of sections of storage batteries, and each section of storage battery is a storage battery monomer or a storage battery small group formed by connecting a plurality of storage battery monomers in series.
Further, the battery measurement acquisition module includes:
the first concentrator is used for receiving the first discharge nuclear capacity control signal transmitted by the direct-current screen charging module and/or the second discharge nuclear capacity control signal transmitted by the remote monitoring equipment through the power supply main control module, and transmitting the first discharge nuclear capacity signal and/or the second discharge nuclear capacity signal to each equalization activation control sub-module respectively;
the equalization activation control submodules are used for respectively controlling each section of storage battery to independently carry out discharge nuclear capacity according to the first discharge nuclear capacity signal and/or the second discharge nuclear capacity signal;
the plurality of monomer data measurement submodules are used for measuring and obtaining the voltage, the current, the internal resistance, the temperature and the environmental temperature of each storage battery monomer in each section of storage battery when the storage battery monomer discharges the nuclear capacity, and transmitting the measured data as the discharge nuclear capacity data of the storage battery monomer to the second concentrator;
and the second concentrator is used for receiving the discharge nuclear capacity data of each storage battery monomer and transmitting the discharge nuclear capacity data of each storage battery monomer to the direct current screen charging module in a centralized manner for display.
On the other hand, the invention also provides an online capacity checking method of the online capacity checking system based on power management control, which comprises the following steps:
s1, acquiring a first discharge nuclear capacity control signal and/or a second discharge nuclear capacity control signal;
s2, according to the first discharging nuclear capacity control signal and/or the second discharging nuclear capacity control signal, the tested battery is connected with the grid-connected nuclear capacity inverter through the DJ circuit sub-module and the PWM control sub-module;
s3, measuring power grid data by using a power grid measurement submodule, and matching the power grid data to obtain a discharge nuclear capacity periodic signal;
s4, discharging the tested battery pack by using a grid-connected core Rong Nibian device according to the discharge capacity periodic signal, and integrating the tested battery pack into a feedback power grid, and measuring by using a single data measurement submodule to obtain discharge capacity data of each storage battery single in each section of storage battery;
and S5, stopping and disconnecting the discharge core Rong Nibian device after the discharge core capacity is ended, pre-charging the tested battery pack after the discharge core capacity for a preset time, and normally charging the pre-charged tested battery pack.
The beneficial effects of the invention are as follows: according to the online nuclear capacity method of the online nuclear capacity system based on power management control, according to the acquired first discharge nuclear capacity control signal and/or second discharge nuclear capacity control signal, the tested battery pack is connected with the grid-connected nuclear capacity inverter through the DJ circuit sub-module and the PWM control sub-module to prepare grid-connected nuclear capacity of the tested battery pack, after the measured power grid data are matched, a discharge nuclear capacity periodic signal is obtained, and according to the discharge nuclear capacity periodic signal, effective reuse of discharge of the storage battery is realized, namely grid-connected feedback is performed to the power grid, waste of energy is avoided, each storage battery monomer in the tested battery pack is pre-charged firstly after the discharge nuclear capacity is discharged, excessive current impact is avoided, and normal charging is performed through the direct current screen charging module, so that safety management protection of the tested battery pack is realized.
Further, the step S2 includes the following steps:
s21, connecting the positive electrode of the battery pack to be tested with the other end of the normally closed node NC of the contactor, the other end of the first resistor, the first movable end of the circuit breaker and the positive electrode of the first diode respectively, and connecting the negative electrode of the battery to be tested with the second fixed end of the circuit breaker and the negative electrode of the direct current screen charging module respectively, so that the direct current screen charging module charges the battery pack to be tested until receiving a discharging nuclear capacity control signal;
s22, according to the first discharging nuclear capacity control signal and/or the second discharging nuclear capacity control signal, starting the contactor to excite by using the PWM control submodule to disconnect a normally closed node NC of the contactor and close a normally open node NO, and stopping charging the battery to be tested by using the direct current screen charging module;
s23, communicating the circuit breaker to enable the tested battery to be assembled into the grid-connected nuclear-capacitance inverter.
The beneficial effects of adopting the further scheme are as follows: the invention firstly accesses the grid-connected nuclear capacity inverter before the tested battery pack discharges the nuclear capacity, and provides a basis for feeding back and integrating the released electric energy into the power grid.
Further, the step S3 includes the following steps:
s31, acquiring voltage data and current data with phase and frequency characteristics in a power grid by utilizing a power grid measurement submodule, and obtaining d-axis current and q-axis current for reference;
s32, phase shifting grid-connected current generated by the tested battery packObtaining a first orthogonal grid-connected current and a second orthogonal grid-connected current;
s33, providing angles for Park transformation and Park inverse transformation by using a phase-locked loop, and performing Park transformation based on the first orthogonal grid-connected current and the second orthogonal grid-connected current to obtain a d-axis grid-connected current and a q-axis grid-connected current;
s34, training the phase alignment neural network based on the deviation between the d-axis current and the d-axis grid-connected current for reference and the deviation between the q-axis current and the q-axis grid-connected current for reference to obtain a phase alignment controller;
s35, performing Park inverse transformation on the output of the phase alignment controller to obtainA component modulated signal;
s36, based onAnd modulating the signal by the component to obtain a discharge nuclear capacity periodic signal.
The beneficial effects of adopting the further scheme are as follows: the invention provides a method for matching measured power grid dataThe method for modulating the signals by the components of the phases provides a basis for the efficient incorporation of the electric energy released by the tested battery pack into the power grid for recycling through the discharge nuclear capacity periodic signals.
Further, the phase alignment neural network in S34 is formed by sequentially connecting three layers, wherein the first layer is an input layer, the second layer is a hidden layer, and the third layer is an output layer; the activation functions adopted by the input layer, the hidden layer and the output layer are hyperbolic tangent functions;
the input layer consists of a row of 4 neurons, and the corresponding inputs of each neuron in the input layer are respectively the product of d-axis current error and current error coefficient, the product of q-axis current error and current error coefficient, the product of d-axis error integration and error integration coefficient and the product of q-axis error integration and error integration coefficient in sequence; the hidden layer consists of 12 neurons and is divided into two columns; the output layer consists of 2 neurons, and the outputs of the 2 neurons in the output layer are respectively corresponding to a d-axis voltage reference signal and a q-axis voltage reference signal; the d-axis voltage reference signal and the q-axis voltage reference signal are obtained after Park inverse transformationA component modulated signal;
the calculation expression of the weighted input and output of each neuron in the phase alignment neural network is as follows:
wherein,representing a weighted input to an nth neuron in the phase aligned neural network, M representing a total number of inputs on the neuron, M representing an input on the mth neuron,/->Represents the mth input on the nth neuron,>representing the weight value corresponding to the input on the mth neuron,/and>represents the output of the nth neuron, +.>Representing a hyperbolic tangent function.
The beneficial effects of adopting the further scheme are as follows: the invention provides a structure of a phase alignment neural network and a weighted input and output calculation method of each neuron in the network, wherein the phase alignment neural network only needs to control d-axis and q-axis components and does not need redundant decoupling processing, an inverter circuit is used as a passage, network output is used as a recursive signal, and the phase alignment neural network is insensitive to parameter changes of a circuit system and has strong applicability, universality, steady state and dynamic performance.
Further, the step S5 includes the following steps:
s51, stopping the discharge core Rong Nibian device after the discharge core capacity is finished, and opening the circuit breaker to disconnect the discharge core Rong Nibian device;
s52, pre-charging the tested battery pack after the nuclear capacity is discharged for a preset time;
s53, opening a normally open node NO of the contactor, closing a normally closed node NC of the contactor, and normally charging the pre-charged tested battery pack by the direct current screen charging module.
The beneficial effects of adopting the further scheme are as follows: according to the invention, the tested battery pack after the discharge nuclear capacity is pre-charged with small current through the first resistor, and then is normally charged after the preset time, so that the safety control of the storage battery for the discharge nuclear capacity is realized.
Other advantages that are also present with respect to the present invention will be more detailed in the following examples.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a block diagram of an online capacity checking system based on power management control in embodiment 1 of the present invention.
Fig. 2 is a schematic circuit diagram of a DJ circuit sub-module in embodiment 1 of the present invention.
Fig. 3 is a flowchart illustrating a step of an online capacity checking method of an online capacity checking system based on power management control in embodiment 2 of the present invention.
Fig. 4 is a block diagram of a grid-connected inverter with a neural network control structure in embodiment 2 of the present invention.
Fig. 5 is a forward propagation structure diagram of a phase alignment controller constructed by a neural network in embodiment 2 of the present invention.
Wherein: con, contactor; r1, a first resistor; d1, a first diode; K. a circuit breaker.
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. The components of the 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 invention, as 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 made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
Example 1:
as shown in fig. 1, in one embodiment of the present invention, the present invention provides an online nuclear capacity system based on power management control, including:
the power supply main control module is used for measuring power grid data, transmitting a second discharging nuclear capacity control signal to perform precharge or discharging switching management, controlling the grid-connected inverter to discharge according to a discharging nuclear capacity period signal of the matched power grid data and integrating the grid-connected inverter into a feedback power grid;
the power supply main control module comprises:
the power grid measurement submodule is used for acquiring voltage data and current data with phase and frequency characteristics in a power grid;
the switching control submodule is used for receiving a second discharge nuclear capacity control signal of the remote monitoring equipment, transmitting the second discharge nuclear capacity control signal to the discharge nuclear capacity module and the battery measurement acquisition module, and controlling a contactor Con and a breaker K in the discharge nuclear capacity module so as to realize precharge or discharge switching management of the battery pack to be tested; and an RS485 communication port and a discharge terminal of the switching control submodule transmit a discharge nuclear capacity control signal to the discharge nuclear capacity module.
And the nuclear capacity period sub-module is used for matching the measured power grid data to obtain a discharge nuclear capacity period signal for discharging the grid-connected inverter and feeding back the grid to the grid.
The discharging nuclear capacity module is used for receiving the first discharging nuclear capacity control signal transmitted by the direct current screen charging module and/or the second discharging nuclear capacity control signal transmitted by the remote monitoring equipment through the power supply main control module, and pre-charging or discharging the nuclear capacity of the battery pack to be tested;
the discharging nuclear capacity module comprises a DJ circuit sub-module and a PWM control sub-module;
as shown in fig. 2, the DJ circuit submodule includes a contactor Con, a first resistor R1, a first diode D1, and a breaker K;
the cathode of the first diode D1, one end of a normally closed node NC of a contactor Con and one end of a normally open node NO are externally connected with the anode of the direct current screen charging module; the other end of the normally open node NO of the contactor Con is connected with one end of a first resistor R1; the other end of the normally closed node NC of the contactor Con is respectively connected with the other end of the first resistor R1, the first movable end of the circuit breaker K and the anode of the first diode D1, and is externally connected with the anode of the battery pack to be tested; the second movable end of the breaker K is externally connected with the negative electrode of the direct current screen charging module and the negative electrode of the battery pack to be tested; the first fixed end and the second fixed end of the circuit breaker K are externally connected with a grid-connected nuclear-capacitance inverter;
the PWM control submodule is used for receiving the first discharge nuclear capacity control signal and/or the second discharge nuclear capacity control signal, and precharging or discharging the tested battery pack by controlling the normally closed node NC and the normally open node NO of the contactor Con and the connection and disconnection of the breaker K. In the nuclear capacity discharging process, if the direct current screen is in alternating current power failure or the charging output fails, the system can immediately stop nuclear capacity discharging.
The direct current screen charging module is used for pre-charging or normally charging the storage battery and sending a first discharging nuclear capacity control signal to the discharging nuclear capacity module or the battery measurement acquisition module; and the pre-charging is to charge the battery pack to be tested by utilizing small current after passing through the first resistor R1, and the battery pack to be tested is directly charged from the direct current screen charging module without passing through the first resistor R1 during normal charging.
When the normal direct current screen charging module carries out direct current charging, a normally closed node NC of a contactor Con is closed, a first diode D1 and a pre-charging circuit (a first resistor R1) are bypassed, the direct current screen charging module carries out normal charging on batteries, when the discharging nuclear capacity is carried out, if the charging work of a direct current touch screen is normal, the charging current of the batteries is smaller, excitation of the contactor Con is started, the normally closed node NC is disconnected, as the first diode D1 is in one-way conduction, the direct current touch screen can not charge the battery pack to be tested any more, the grid-connected nuclear Rong Nibian device is controlled by RS485 to discharge the battery pack to be tested according to a discharging nuclear capacity periodic signal, when the nuclear capacity is stopped, the grid-connected nuclear capacity inverter is stopped, in order to prevent the charging of all battery monomers in the battery pack to be tested from being excessively large, the contactor Con is firstly put into pre-charging for a period of time, the contactor Con is disconnected, the normally charged by closing the normally closed node NC, the pre-charging is stopped, and the direct current touch screen is carried out.
The battery pack to be tested is a sectional type storage battery and comprises a plurality of sections of storage batteries, and each section of storage battery is a storage battery monomer or a storage battery small group formed by connecting a plurality of storage battery monomers in series.
The battery measurement acquisition module is used for receiving the first discharge nuclear capacity control signal transmitted by the direct current screen charging module and/or the second discharge nuclear capacity control signal transmitted by the remote monitoring equipment through the power supply main control module, performing balanced activation control on a plurality of battery packs to be tested, measuring discharge nuclear capacity data of each storage battery monomer, and displaying the discharge nuclear capacity data of each storage battery monomer to the direct current screen charging module.
The battery measurement acquisition module includes:
the first concentrator is used for receiving the first discharge nuclear capacity control signal transmitted by the direct-current screen charging module and/or the second discharge nuclear capacity control signal transmitted by the remote monitoring equipment through the power supply main control module, and transmitting the first discharge nuclear capacity signal and/or the second discharge nuclear capacity signal to each equalization activation control sub-module respectively;
the equalization activation control submodules are used for respectively controlling each section of storage battery to independently carry out discharge nuclear capacity according to the first discharge nuclear capacity signal and/or the second discharge nuclear capacity signal;
the plurality of monomer data measurement submodules are used for measuring and obtaining the voltage, the current, the internal resistance, the temperature and the environmental temperature of each storage battery monomer in each section of storage battery when the storage battery monomer discharges the nuclear capacity, and transmitting the measured data as the discharge nuclear capacity data of the storage battery monomer to the second concentrator;
and the second concentrator is used for receiving the discharge nuclear capacity data of each storage battery monomer and transmitting the discharge nuclear capacity data of each storage battery monomer to the direct current screen charging module in a centralized manner for display.
Example 2:
as shown in fig. 3, on the other hand, based on the online core-capacity system based on the power management control in the embodiment 1, the invention further provides an online core-capacity method of the online core-capacity system based on the power management control, which comprises the following steps:
s1, acquiring a first discharge nuclear capacity control signal and/or a second discharge nuclear capacity control signal;
s2, according to the first discharging nuclear capacity control signal and/or the second discharging nuclear capacity control signal, the tested battery is connected with the grid-connected nuclear capacity inverter through the DJ circuit sub-module and the PWM control sub-module;
the step S2 comprises the following steps:
s21, connecting the positive electrode of the battery pack to be tested with the other end of the normally closed node NC of the contactor Con, the other end of the first resistor R1, the first movable end of the breaker K and the positive electrode of the first diode D1 respectively, and connecting the negative electrode of the battery to be tested with the second stationary end of the breaker K and the negative electrode of the direct current screen charging module respectively, so that the direct current screen charging module charges the battery pack to be tested until receiving a discharging nuclear capacity control signal;
s22, starting a contactor Con to excite according to the first discharging nuclear capacity control signal and/or the second discharging nuclear capacity control signal by using a PWM control submodule to disconnect a normally closed node NC of the contactor Con and close a normally open node NO, and stopping charging the battery to be tested by using a direct current screen charging module;
s23, communicating the circuit breaker K to enable the tested battery to be connected with the grid-connected nuclear-capacitance inverter.
S3, measuring power grid data by using a power grid measurement submodule, and matching the power grid data to obtain a discharge nuclear capacity periodic signal;
as shown in fig. 4, the equivalent structure of the unidirectional LCL grid-connected inverter is V dc Is the voltage of a direct current bus, C dc Is a direct-current voltage-stabilizing capacitor, v in For inverting the bridge output voltage v g For the grid voltage, i g Is the grid current; c (C) dc The capacitor is a direct-current side capacitor and is used for voltage stabilization and filtering; l (L) CL The filter is composed of an inverter side inductor L 1 Filter capacitor C and net side inductance L 2 Composition is prepared.
The step S3 comprises the following steps:
s31, acquiring voltage data and current data with phase and frequency characteristics in a power grid by utilizing a power grid measurement submodule, and obtaining d-axis current for referenceAnd q-axis current>；
S32, phase shifting grid-connected current generated by the tested battery packI.e. phase shift +.>Obtaining a first orthogonal grid-connected currentAnd a second orthogonal grid-connected current->Wherein e is an exponential basal constant parameter, < ->Representing one period of the current signal;
s33, providing angles for Park conversion and Park inverse conversion by using phase-locked loop PLLAnd performing Park conversion based on the first orthogonal grid-connected current and the second orthogonal grid-connected current to obtain d-axis grid-connected current +.>And q-axis grid-connected current->；
S34, based on d-axis current for referenceGrid-connected current with d-axis->Is used for reference q-axis current +.>Deviation from q-axis grid-connected current +.>Training the phase alignment neural network to obtain a phase alignment controller;
as shown in fig. 5, the phase alignment neural network in S34 is formed by sequentially connecting three layers, wherein the first layer is an input layer, the second layer is a hidden layer, and the third layer is an output layer; the activation functions adopted by the input layer, the hidden layer and the output layer are hyperbolic tangent functions;
the input layer consists of a row of 4 neurons, and the corresponding inputs of the neurons in the input layer are respectively and sequentially the product e of d-axis current error and current error coefficient d Product e of q-axis current error and current error coefficient q Product S of d-axis error integral and error integral coefficient d And the product S of the q-axis error integral and the error integral coefficient q The method comprises the steps of carrying out a first treatment on the surface of the The hidden layer consists of 12 neurons and is divided into two columns; the output layer consists of 2 neurons, and the output of the 2 neurons in the output layer is d-axis voltage reference signalAnd q-axis voltage reference signal->The method comprises the steps of carrying out a first treatment on the surface of the The d-axis voltage reference signal and the q-axis voltage reference signal are obtained after Park inverse transformation>A component modulated signal;
the calculation expression of the weighted input and output of each neuron in the phase alignment neural network is as follows:
wherein,representing a weighted input to an nth neuron in the phase aligned neural network, M representing a total number of inputs on the neuron, M representing an input on the mth neuron,/->Represents the mth input on the nth neuron,>representing the weight value corresponding to the input on the mth neuron,/and>represents the output of the nth neuron, +.>Representing a hyperbolic tangent function.
S35, performing Park inverse transformation on the output of the phase alignment controller to obtainComponent modulated signal->；
S36, based onComponent modulated signal->And obtaining a discharge nuclear capacity periodic signal. Said->Component modulated signalAfter being combined with the filtering voltage, the direct-current voltage in the inverter is matched and regulated through the SPWM.
S4, discharging the tested battery pack by using a grid-connected core Rong Nibian device according to the discharge capacity periodic signal, and integrating the tested battery pack into a feedback power grid, and measuring by using a single data measurement submodule to obtain discharge capacity data of each storage battery single in each section of storage battery;
and S5, stopping and disconnecting the discharge core Rong Nibian device after the discharge core capacity is ended, pre-charging the tested battery pack after the discharge core capacity for a preset time, and normally charging the pre-charged tested battery pack.
The step S5 comprises the following steps:
s51, stopping the discharge core Rong Nibian device after the discharge core capacity is finished, and opening the circuit breaker K to disconnect the discharge core Rong Nibian device;
s52, pre-charging the tested battery pack after the nuclear capacity is discharged for a preset time;
s53, opening a normally open node NO of a contactor Con, closing a normally closed node NC of the contactor Con, and normally charging the pre-charged tested battery pack by the direct current screen charging module.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention.
Claims (10)
1. An on-line nuclear capacity system based on power management control, comprising:
the power supply main control module is used for measuring power grid data, transmitting a second discharging nuclear capacity control signal to perform precharge or discharging switching management, controlling the grid-connected inverter to discharge according to a discharging nuclear capacity period signal of the matched power grid data and integrating the grid-connected inverter into a feedback power grid;
the discharging nuclear capacity module is used for receiving the first discharging nuclear capacity control signal transmitted by the direct current screen charging module and/or the second discharging nuclear capacity control signal transmitted by the remote monitoring equipment through the power supply main control module, and pre-charging or discharging the nuclear capacity of the battery pack to be tested;
the battery measurement acquisition module is used for receiving the first discharge nuclear capacity control signal transmitted by the direct current screen charging module and/or the second discharge nuclear capacity control signal transmitted by the remote monitoring equipment through the power supply main control module, performing balanced activation control on a plurality of battery packs to be tested, measuring discharge nuclear capacity data of each storage battery monomer, and displaying the discharge nuclear capacity data of each storage battery monomer to the direct current screen charging module.
2. The power management control-based online nuclear capacity system of claim 1, wherein the power master control module comprises:
the power grid measurement submodule is used for acquiring voltage data and current data with phase and frequency characteristics in a power grid;
the switching control submodule is used for receiving a second discharge nuclear capacity control signal of the remote monitoring equipment, transmitting the second discharge nuclear capacity control signal to the discharge nuclear capacity module and the battery measurement acquisition module, and controlling a contactor and a breaker in the discharge nuclear capacity module so as to realize precharge or discharge switching management of the battery pack to be tested;
and the nuclear capacity period sub-module is used for matching the measured power grid data to obtain a discharge nuclear capacity period signal for discharging the grid-connected inverter and feeding back the grid to the grid.
3. The power management control-based online nuclear capacity system according to claim 2, wherein the discharging nuclear capacity module comprises a DJ circuit sub-module and a PWM control sub-module;
the DJ circuit submodule comprises a contactor, a first resistor, a first diode and a breaker;
the cathode of the first diode, one end of a normally closed node NC of the contactor and one end of a normally open node NO are all externally connected with the anode of the direct current screen charging module; the other end of the normally open node NO of the contactor is connected with one end of the first resistor; the other end of the normally closed node NC of the contactor is respectively connected with the other end of the first resistor, the first movable end of the circuit breaker and the positive electrode of the first diode, and is externally connected with the positive electrode of the battery pack to be tested; the second movable end of the circuit breaker is externally connected with the negative electrode of the direct current screen charging module and the negative electrode of the battery pack to be tested; the first fixed end and the second fixed end of the circuit breaker are externally connected with a grid-connected nuclear-capacitance inverter;
the PWM control submodule is used for receiving the first discharge nuclear capacity control signal and/or the second discharge nuclear capacity control signal, and precharging or discharging the nuclear capacity of the tested battery pack through the connection and disconnection of a normally closed node NC and a normally open node NO of the control contactor and a circuit breaker.
4. The power management control-based on-line nuclear capacity system according to claim 3, wherein the battery pack to be tested is a segmented storage battery and comprises a plurality of segments of storage batteries, and each segment of storage battery is a storage battery cell or a storage battery small group formed by connecting a plurality of storage battery cells in series.
5. The power management control-based online nuclear capacity system of claim 4, wherein the battery measurement acquisition module comprises:
the first concentrator is used for receiving the first discharge nuclear capacity control signal transmitted by the direct-current screen charging module and/or the second discharge nuclear capacity control signal transmitted by the remote monitoring equipment through the power supply main control module, and transmitting the first discharge nuclear capacity signal and/or the second discharge nuclear capacity signal to each equalization activation control sub-module respectively;
the equalization activation control submodules are used for respectively controlling each section of storage battery to independently carry out discharge nuclear capacity according to the first discharge nuclear capacity signal and/or the second discharge nuclear capacity signal;
the plurality of monomer data measurement submodules are used for measuring and obtaining the voltage, the current, the internal resistance, the temperature and the environmental temperature of each storage battery monomer in each section of storage battery when the storage battery monomer discharges the nuclear capacity, and transmitting the measured data as the discharge nuclear capacity data of the storage battery monomer to the second concentrator;
and the second concentrator is used for receiving the discharge nuclear capacity data of each storage battery monomer and transmitting the discharge nuclear capacity data of each storage battery monomer to the direct current screen charging module in a centralized manner for display.
6. An online capacity checking method of an online capacity checking system based on power management control according to any one of claims 1 to 5, comprising the steps of:
s1, acquiring a first discharge nuclear capacity control signal and/or a second discharge nuclear capacity control signal;
s2, according to the first discharging nuclear capacity control signal and/or the second discharging nuclear capacity control signal, the tested battery is connected with the grid-connected nuclear capacity inverter through the DJ circuit sub-module and the PWM control sub-module;
s3, measuring power grid data by using a power grid measurement submodule, and matching the power grid data to obtain a discharge nuclear capacity periodic signal;
s4, discharging the tested battery pack by using a grid-connected core Rong Nibian device according to the discharge capacity periodic signal, and integrating the tested battery pack into a feedback power grid, and measuring by using a single data measurement submodule to obtain discharge capacity data of each storage battery single in each section of storage battery;
and S5, stopping and disconnecting the discharge core Rong Nibian device after the discharge core capacity is ended, pre-charging the tested battery pack after the discharge core capacity for a preset time, and normally charging the pre-charged tested battery pack.
7. The online capacity checking method of the online capacity checking system based on the power management control according to claim 6, wherein S2 comprises the steps of:
s21, connecting the positive electrode of the battery pack to be tested with the other end of the normally closed node NC of the contactor, the other end of the first resistor, the first movable end of the circuit breaker and the positive electrode of the first diode respectively, and connecting the negative electrode of the battery to be tested with the second fixed end of the circuit breaker and the negative electrode of the direct current screen charging module respectively, so that the direct current screen charging module charges the battery pack to be tested until receiving a discharging nuclear capacity control signal;
s22, according to the first discharging nuclear capacity control signal and/or the second discharging nuclear capacity control signal, starting the contactor to excite by using the PWM control submodule to disconnect a normally closed node NC of the contactor and close a normally open node NO, and stopping charging the battery to be tested by using the direct current screen charging module;
s23, communicating the circuit breaker to enable the tested battery to be assembled into the grid-connected nuclear-capacitance inverter.
8. The online capacity checking method of the online capacity checking system based on the power management control according to claim 6, wherein S3 comprises the steps of:
s31, acquiring voltage data and current data with phase and frequency characteristics in a power grid by utilizing a power grid measurement submodule, and obtaining d-axis current and q-axis current for reference;
s32, phase shifting grid-connected current generated by the tested battery packObtaining a first orthogonal grid-connected current and a second orthogonal grid-connected current;
s33, providing angles for Park transformation and Park inverse transformation by using a phase-locked loop, and performing Park transformation based on the first orthogonal grid-connected current and the second orthogonal grid-connected current to obtain a d-axis grid-connected current and a q-axis grid-connected current;
s34, training the phase alignment neural network based on the deviation between the d-axis current and the d-axis grid-connected current for reference and the deviation between the q-axis current and the q-axis grid-connected current for reference to obtain a phase alignment controller;
s35, performing Park inverse transformation on the output of the phase alignment controller to obtainA component modulated signal;
s36, based onAnd modulating the signal by the component to obtain a discharge nuclear capacity periodic signal.
9. The method for online capacity of online capacity system based on power management control according to claim 8, wherein the phase alignment neural network in S34 is composed of three layers sequentially connected, the first layer is an input layer, the second layer is a hidden layer, and the third layer is an output layer; the activation functions adopted by the input layer, the hidden layer and the output layer are hyperbolic tangent functions;
the input layer consists of a row of 4 neurons, and the corresponding inputs of each neuron in the input layer are respectively the product of d-axis current error and current error coefficient, the product of q-axis current error and current error coefficient, the product of d-axis error integration and error integration coefficient and the product of q-axis error integration and error integration coefficient in sequence; the hidden layer consists of 12 neurons and is divided into two columns; the output layer consists of 2 neurons, and the outputs of the 2 neurons in the output layer are respectively corresponding to a d-axis voltage reference signal and a q-axis voltage reference signal; the d-axis voltage reference signal and the q-axis voltage reference signal are obtained after Park inverse transformationA component modulated signal;
the calculation expression of the weighted input and output of each neuron in the phase alignment neural network is as follows:
wherein,representing a weighted input to an nth neuron in the phase aligned neural network, M representing a total number of inputs on the neuron, M representing an input on the mth neuron,/->Represents the mth input on the nth neuron,>representing the weight value corresponding to the input on the mth neuron,/and>represents the output of the nth neuron, +.>Representing a hyperbolic tangent function.
10. The online capacity checking method of the online capacity checking system based on the power management control according to claim 6, wherein S5 comprises the steps of:
s51, stopping the discharge core Rong Nibian device after the discharge core capacity is finished, and opening the circuit breaker to disconnect the discharge core Rong Nibian device;
s52, pre-charging the tested battery pack after the nuclear capacity is discharged for a preset time;
s53, opening a normally open node NO of the contactor, closing a normally closed node NC of the contactor, and normally charging the pre-charged tested battery pack by the direct current screen charging module.
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