CN114336821A - Light storage system control method, control circuit, light storage system and electronic equipment - Google Patents
Light storage system control method, control circuit, light storage system and electronic equipment Download PDFInfo
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Abstract
The application relates to a light storage system control method, a control circuit, a light storage system and an electronic device, wherein the method comprises the following steps: acquiring state parameters of a maximum power point tracking MPPT controller and a storage battery; and adjusting the running state of the storage battery according to the state parameter. The current running state of the storage battery can be known through the state parameters of the storage battery, and the running parameters of the storage battery are adjusted according to different running states of the storage battery, so that the storage battery can be kept in a stable state according to different system conditions, a small-capacity battery is applied to the optical storage system, and the battery cost of the optical storage system is reduced.
Description
Technical Field
The present application relates to the field of photovoltaics, and in particular, to a light storage system control method, a control circuit, a light storage system, and an electronic device.
Background
In traditional light stores up the system, preceding stage photovoltaic MPPT controller and back level energy storage converter DC/AC discharge are the decoupling zero, appear suddenly in the system, cause the damage to the battery easily, influence the life-span of battery, consequently the battery of current light stores up the system need adopt the great battery of capacity to reduce the influence of sudden change, and the battery cost is higher.
Disclosure of Invention
The application provides a light storage system control method, a control circuit, a light storage system and an electronic device, and aims to solve the technical problem that in the prior art, the cost of a battery is high.
In order to solve the above technical problem or at least partially solve the above technical problem, the present application provides a light storage system control method, including the steps of:
acquiring state parameters of the storage battery;
and adjusting the running state of the storage battery according to the state parameter.
Optionally, the step of adjusting the operating state of the storage battery according to the battery voltage includes:
acquiring the battery voltage of the storage battery and a preset voltage hysteresis interval, and judging whether the battery voltage is greater than the maximum value of the voltage hysteresis interval or less than the minimum value of the voltage hysteresis interval;
if the battery voltage is larger than the maximum value of the voltage hysteresis zone, controlling the storage battery to adjust power to discharge; if the battery voltage is smaller than the minimum value of the voltage hysteresis zone, controlling the storage battery to be charged with the target battery power; and if the battery voltage is in the voltage hysteresis zone, keeping the current state of the storage battery unchanged.
Optionally, the step of controlling the storage battery to adjust power for discharging includes:
setting the battery discharge power of the storage battery to 0, and updating the target output power to the sum of the regulation power and the MPPT power.
Optionally, the state parameter includes a cell voltage of the storage battery, and the step before controlling the storage battery to be charged at the cell target power further includes:
acquiring a preset adjusting coefficient, the float charge voltage of the storage battery and the battery voltage;
and calculating to obtain the target power of the battery according to the preset adjusting coefficient, the float charging voltage and the battery voltage.
Optionally, the state parameter comprises a cell voltage of the battery; the step of adjusting the operating state of the battery according to the state parameter includes:
when the optical storage system is connected to the grid, acquiring a preset over-discharge voltage, and judging whether the battery voltage is smaller than the preset over-discharge voltage or not;
if the battery voltage is less than the preset over-discharge voltage, charging the storage battery through a power grid;
acquiring a preset recovery voltage, and continuously judging whether the battery voltage is greater than the preset recovery voltage;
and if the battery voltage is greater than the preset recovery voltage, stopping charging the storage battery through the power grid.
Optionally, the method further comprises:
when the light storage system is connected to the grid, acquiring the battery target power of the storage battery and the MPPT power of the MPPT controller;
and obtaining the target output power of the energy storage converter according to the target power of the battery and the MPPT power.
Optionally, the method further comprises:
when the optical storage system is off-grid, acquiring the battery voltage of the storage battery and the actual inversion power of the energy storage converter;
and obtaining the target MPPT power of the MPPT controller according to the battery voltage and the actual inverter power.
In order to achieve the above object, the present invention further provides an optical storage system control circuit, which is applied to the optical storage system control method, and the optical storage system control circuit includes: the MPPT controller, the storage battery and the energy storage converter; the input end of the MPPT controller is connected with a solar component, the output end of the MPPT controller is respectively connected with the storage battery and the energy storage converter, the storage battery is also connected with the energy storage converter, the alternating current output end of the energy storage converter is used as the output end of the control circuit of the light storage system, the energy storage converter comprises a central controller, and the central controller is respectively connected with the MPPT controller and the storage battery; wherein:
and the central controller is used for acquiring the state parameters of the storage battery and adjusting the running state of the storage battery according to the state parameters.
In order to achieve the above object, the present invention further provides an optical storage system, which includes a solar module and the optical storage system control circuit as described above, wherein the solar module is connected to the optical storage system control circuit.
In order to achieve the above object, the present invention further provides an electronic device, which is applied to the light storage system control method, and the electronic device includes:
the first acquisition module is used for acquiring state parameters of the storage battery;
and the first adjusting module is used for adjusting the running state of the storage battery according to the state parameter.
Optionally, the first adjusting module includes:
the first judgment unit is used for acquiring the battery voltage of the storage battery and a preset voltage hysteresis interval and judging whether the battery voltage is larger than the maximum value of the voltage hysteresis interval or smaller than the minimum value of the voltage hysteresis interval;
the first control unit is used for controlling the storage battery to adjust power to discharge if the battery voltage is larger than the maximum value of the voltage hysteresis interval; if the battery voltage is smaller than the minimum value of the voltage hysteresis zone, controlling the storage battery to be charged with the target battery power; and if the battery voltage is in the voltage hysteresis zone, keeping the current state of the storage battery unchanged.
Optionally, the first control unit comprises:
a first updating subunit, configured to set a battery discharge power of the storage battery to 0, and update the target output power to a sum of the regulation power and the MPPT power.
Optionally, the state parameter includes a cell voltage of the battery, and the first adjusting module further includes:
a first acquisition unit configured to acquire a preset adjustment coefficient, a float voltage of the storage battery, and the battery voltage;
and the first calculation unit is used for calculating the target power of the battery according to the preset regulation coefficient, the float charging voltage and the battery voltage.
Optionally, the state parameter comprises a cell voltage of the battery; the first adjustment module includes:
the second judgment unit is used for acquiring a preset over-discharge voltage when the control circuit of the optical storage system is connected to the grid and judging whether the battery voltage is smaller than the preset over-discharge voltage or not;
the first execution unit is used for charging the storage battery through a power grid if the battery voltage is smaller than the preset over-discharge voltage;
the second acquisition unit is used for acquiring a preset recovery voltage and continuously judging whether the battery voltage is greater than the preset recovery voltage;
and the second execution unit is used for stopping charging the storage battery through the power grid if the battery voltage is greater than the preset recovery voltage.
Optionally, the electronic device further comprises:
the second acquisition module is used for acquiring the battery target power of the storage battery and the MPPT power of the MPPT controller when the optical storage system is connected to the grid;
and the first execution module is used for obtaining the target output power of the energy storage converter according to the target power of the battery and the MPPT power.
Optionally, the electronic device further comprises:
the third acquisition module is used for acquiring the battery voltage of the storage battery and the actual inversion power of the energy storage converter when the optical storage system is off-grid;
and the second execution unit is used for obtaining the target MPPT power of the MPPT controller according to the battery voltage and the actual inverter power.
The invention provides a light storage system control method, a control circuit, a light storage system and an electronic device, which are used for acquiring state parameters of a storage battery; and adjusting the running state of the storage battery according to the state parameter. The current running state of the storage battery can be known through the state parameters of the storage battery, and the running parameters of the storage battery are adjusted according to different running states of the storage battery, so that the storage battery can be kept in a stable state according to different system conditions, a small-capacity battery is applied to the optical storage system, and the battery cost of the optical storage system is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic diagram of an optical storage system according to the present invention;
fig. 2 is a schematic flow chart illustrating a control method of an optical storage system according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of electrical signal transmission of the control circuit of the optical storage system according to the present invention;
FIG. 4 is a schematic diagram of a key voltage point of a battery in the light storage system of the present invention;
FIG. 5 is a graph showing the charging characteristics of the storage battery in the light storage system according to the present invention;
fig. 6 is a graph showing the discharge characteristics of the secondary battery in the light storage system according to the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | |
200 | |
| 300 | |
201 | Central controller |
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The invention provides a method for controlling an optical storage system, which is applied to a control circuit of the optical storage system, and referring to fig. 1, the control circuit of the optical storage system comprises: an MPPT (Maximum Power Point Tracking) controller 100, a storage battery 300, and an energy storage converter 200; the input end of the MPPT controller 100 is connected to a solar module, the output end of the MPPT controller 100 is connected to the storage battery 300 and the energy storage converter 200, respectively, the storage battery 300 is further connected to the energy storage converter 200, the ac output end of the energy storage converter 200 is used as the output end of the optical storage system control circuit, the energy storage converter 200 includes a central controller 201, and the central controller 201 is connected to the MPPT controller 100 and the storage battery 300, respectively; wherein:
the central controller 201 is configured to acquire state parameters of the MPPT controller 100 and the storage battery 300, and adjust an operation parameter of the storage battery 300 according to the state parameters, so as to adjust an operation state of the storage battery 300.
The solar module is used for converting light energy into electric energy and outputting the electric energy to the MPPT controller 100; the central controller 201 issues a tracking instruction to the MPPT controller 100 according to the energy requirement, and the MPPT controller 100 performs MPPT tracking according to the tracking instruction; the MPPT controller 100 transmits energy to the dc bus, that is, to the battery 300 and/or the energy storage converter 200; the output end of the energy storage converter 200 is connected with a power grid and a load respectively, the energy storage converter 200 can realize automatic switching between a grid-connected mode and a grid-disconnected mode, wherein the grid-connected mode refers to connection with the power grid, and the grid-disconnected mode refers to disconnection with the power grid; in the grid-connected mode, the output power of the energy storage converter 200 is controlled by an instruction issued by the central controller 201, and in the off-grid mode, the output power of the energy storage converter 200 is determined by the characteristics of the load. The central controller 201 uniformly schedules the power of the front and rear stages of the optical storage system, namely the tracking power of the MPPT and the output power of the energy storage converter 200, and the central controller 201 has the functions of reading battery parameters, calculating power requirements, scheduling millisecond-stage power, protecting the system and the like.
In this embodiment, the basic control logic in different modes is:
in the grid-connected mode, the pre-stage MPPT controller 100 slowly tracks MPPT power, photovoltaic energy output by the solar module is used as main input energy and plays a leading role, the system preferentially uses the photovoltaic energy to guarantee charging energy of a battery for subsequent use, the post-stage energy storage converter 200 operates in a grid-connected discharging mode, a power grid is used as an energy output end, and when the photovoltaic energy is sufficient, namely the charging energy of a load power supply and a storage battery 300 can be guaranteed, redundant energy is fed into the power grid through the energy storage converter 200. In the off-grid mode, the rear-stage energy storage converter 200 operates in the off-grid discharge mode, photovoltaic energy is used as main input energy, a load is used as an energy output object, and the load energy requirement plays a leading role; the central controller 201 issues an instruction to the MPPT controller 100 to track MPPT, and at the same time, the central controller 201 issues an instruction to the storage battery 300 to control the charge and discharge power of the storage battery 300; when the photovoltaic energy is sufficient, the load is powered by the photovoltaic energy, and the redundant energy is used for charging the storage battery 300; when the photovoltaic energy is insufficient, the storage battery 300 is used for auxiliary power supply, and effective power supply of the load is guaranteed.
Referring to fig. 2, fig. 2 is a schematic flow chart of a control method of an optical storage system according to a first embodiment of the present invention, where the method includes the steps of:
step S10, acquiring state parameters of the storage battery;
the state parameter includes a cell voltage of the battery; the current battery state of the storage battery can be known according to the state parameters.
And step S20, adjusting the running state of the storage battery according to the state parameter.
The operating state of the storage battery is adjusted based on the state parameters of the storage battery, so that the influence of circuit fluctuation or sudden change on the storage battery can be avoided, and the storage battery is always kept in the optimal operating state.
The present running state of battery can be known to this embodiment through the state parameter of battery, adjusts the running parameter of battery according to the different running state of battery for can all keep the battery in stable state to the system condition of difference, thereby realize using the low capacity battery in the light stores up the system, reduced the battery cost of light stores up the system.
Further, in a second embodiment of the light storage system control method according to the present invention that is set forth based on the first embodiment of the present invention, the state parameter includes a cell voltage of the storage battery, and the step S20 includes the steps of:
the step S20 includes the steps of:
step S21, acquiring the battery voltage of the storage battery and a preset voltage hysteresis interval, and judging whether the battery voltage is larger than the maximum value of the voltage hysteresis interval or smaller than the minimum value of the voltage hysteresis interval;
step S22, if the battery voltage is larger than the maximum value of the voltage hysteresis zone, controlling the storage battery to adjust power for discharging; if the battery voltage is smaller than the minimum value of the voltage hysteresis zone, controlling the storage battery to be charged with the target battery power; and if the battery voltage is in the voltage hysteresis zone, keeping the current state of the storage battery unchanged.
When the light storage system is connected to the grid, acquiring the battery target power of the storage battery and the MPPT power of the MPPT controller;
and obtaining the target output power of the energy storage converter according to the target power of the battery and the MPPT power.
Specifically, under a grid-connected mode, the target power of a battery is determined based on the running state of the storage battery, and the MPPT power is determined based on photovoltaic energy; when the photovoltaic energy is sufficient, the system works in a steady state, the battery power is reduced along with the gradual full charge of the storage battery, the target output power is gradually increased, the front-stage MPPT controller always works at an MPPT point, the photovoltaic energy is fully utilized, and the central controller controls the target output power of the energy storage converter to follow the MPPT power in real time; when the photovoltaic energy is insufficient, the target output power is reduced along with the reduction of the MPPT power; in the process, because the front-stage MPPT controller has power fluctuation, the target output power of the energy storage converter cannot completely and synchronously follow the change of the MPPT controller due to response delay in control; for example, in a steady state condition, the MPPT power is reduced in a small range, because the control is delayed, the storage battery is discharged in a delay period, after the delay, the target output power is synchronized with the change of the MPPT power, and at the moment, the storage battery is charged again, when the MPPT power fluctuates, the problem of frequent small-current charging and discharging of the storage battery can be caused; establishing a voltage hysteresis interval, wherein a battery saturation area is arranged above the voltage hysteresis interval, and when the battery voltage is positioned in the battery saturation area, the battery is in a discharging state by adjusting power; and an undersaturation area is arranged below the voltage hysteresis area, and when the voltage of the battery is positioned in the undersaturation area, the battery is controlled to be in a charging state so as to reduce the charging and discharging frequency and ensure the service life of the battery.
When the optical storage system is off-grid, acquiring the battery voltage of the storage battery and the actual inversion power of the energy storage converter;
and obtaining the target MPPT power of the MPPT controller according to the battery voltage and the actual inverter power.
Specifically, in an off-grid mode, a micro-grid system is established on an inversion side of a rear-stage energy storage converter and used as an alternating current source to stably and continuously supply power to a load, actual inversion power is determined based on actual power of the load, and a central controller dynamically adjusts MPPT power according to the load power and the battery voltage. When the photovoltaic energy is sufficient, the MPPT power can guarantee the power requirement of the alternating current load, meanwhile, the energy is supplemented to the storage battery through the MPPT power, the fluctuation of the photovoltaic can cause the fluctuation of the charging current of the battery, and the charging current of the battery needs to be dynamically adjusted according to the charging and discharging characteristic curve of the battery, so that the MPPT power is adjusted in time; when the photovoltaic energy is insufficient, the photovoltaic energy and the battery energy are complementary to ensure that the load on the alternating current side supplies power stably, and at the moment, the condition that the MPPT power fluctuates near the load power can also occur, so that the battery is charged and discharged frequently; and a voltage hysteresis interval is also established, the battery is in a discharging state by adjusting the power above the voltage hysteresis interval, and the battery is charged according to the preset battery charging power below the voltage hysteresis interval, so that frequent charging and discharging of the battery can be effectively prevented, and the problem of overvoltage faults caused by voltage rise in the unloading process can also be prevented. The photovoltaic energy shortage refers to a condition that the MPPT power fluctuates around the load power; when the photovoltaic energy is seriously insufficient, namely the AC load cannot be supplied with power only through the photovoltaic energy, the voltage hysteresis interval is cancelled, and the AC load is supplied with power through the cooperation of the battery energy; specifically, the serious deficiency of the photovoltaic energy can be judged in different ways, and when the MPPT power is smaller than the preset low photovoltaic power for the preset time, the photovoltaic energy is considered to be serious deficiency; the judgment can also be made by time, and because the night illumination is weak, the night time, such as 18: 00-8: 00 is set as a preset low photovoltaic time interval, when the system time is in the preset low photovoltaic time interval, the photovoltaic energy is considered to be seriously insufficient, and it can be understood that the preset low photovoltaic time interval can be correspondingly set according to different factors such as date, place and the like, and is not limited herein; the judgment can also be performed according to the weather conditions, for example, the current weather conditions are obtained, if the weather is cloudy, rainy, snowy, fog and the like, the photovoltaic energy is considered to be seriously insufficient, and the photovoltaic energy conditions corresponding to the specific weather conditions can be set according to the actual application scene without limitation; it should be noted that the different schemes may be individually selected or combined to determine the photovoltaic energy condition, and different schemes may be correspondingly set in different application scenarios and actual needs. It should be noted that, because the photovoltaic energy mainly depends on the illumination, the present embodiment may also be combined with other manners for determining the illumination intensity in the prior art to determine the photovoltaic energy, and the combination of the other manners for determining the illumination intensity on the basis of the present embodiment is also within the protection scope of the present application.
The following description is based on the working principle of the optical storage system.
The calculation formula of the MPPT power is as follows:
PMFFT＝Ptnv-PBattery-P4
wherein: pMFFTTarget MPPT Power, P, for MPPTinvTo actual inverter power
Referring to fig. 3, fig. 3 is a schematic diagram of electrical signal transmission of the control circuit of the optical storage system of the present invention, and a calculation formula of the actual inversion power is as follows:
Ptnv＝Iinv_di×Vbus
wherein, Iinv_dcFor charging current, VbusIs the bus voltage.
The step S22 includes the steps of:
step S221, setting the battery discharge power of the storage battery to 0, and updating the target output power to the sum of the adjustment power and the MPPT power.
The adjustment formula of the target output power is as follows:
Pinv_set＝PMPPT_fb+PBattery+PΔ
wherein, Ptnv_setIs the target output power, PMFFT_fbFor actual power of MPPT, PBatteryIs the battery target power (negative when charging), PΔTo regulate power.
In the operation process of the optical storage system, the allowed charging current of the storage battery needs to be dynamically adjusted, the requirements of the lead-acid battery on the charging current in different voltage intervals need to be researched, referring to fig. 4, the key voltage points of the battery include a cell voltage Vcell, a cell float charging voltage Vbat _ float, a cell protection voltage Vbat _ protect and a discharge end voltage EOD. Taking KSTAR GFM600T lead-acid battery as an example, FIG. 5 is a charging characteristic curve diagram of battery voltage, charging current and battery capacity of the lead-acid battery at 25 ℃.
In a grid-connected mode, when the illumination intensity is unstable, frequent charging and discharging of a storage battery can be caused by photovoltaic fluctuation, namely MPPT power fluctuation, and the service life of the storage battery is influenced; under the off-grid mode, when the load is constant, the inverter power is constant, the target power of the battery is constant, so the MPPT power required to be output is constant, if the photovoltaic is unstable, the actual output MPPT power cannot reach the target output power, the condition that the charging and discharging of the storage battery are frequently switched is caused, and the service life of the storage battery is influenced. In this embodiment, the voltage is divided into 3 regions according to the capacity, which are a saturation region, a critical saturation region and an under-saturation region, respectively, and the critical saturation region is a voltage hysteresis region. In steady state conditions, when the battery voltage is in the saturation region, the battery target power PBatteryTends to 0, and P is added at this time so as not to repeat charging and discharging of the secondary batteryBateryIs fixedly arranged as0, by adjusting the power PΔThe storage battery is in a low-power discharge state, the charge-discharge state of the battery cannot be changed by the fluctuation of the photovoltaic, and the power P is regulated along with the timeΔThe battery voltage passes through the critical saturation region from the saturation region into the undersaturation region, and when the battery voltage is in the undersaturation region, the power P is adjustedΔSet to 0, the system resumes the target power P of the batteryBateryCharging, slowly passing through the critical saturation region again and entering the saturation region; by adopting the scheme of adjusting the power and voltage hysteresis interval, the charging and discharging frequency of the system under the steady state is controllable, and the frequent switching of the charging and discharging states of the storage battery is effectively prevented.
The size of the voltage hysteresis interval can be set according to the actual parameters of the battery, for example, a GFM600T lead-acid battery is taken as an example, when the capacity is 85% or more, the charging current is allowed to be rapidly reduced, and the corresponding voltage is V at the moment1When the voltage is greater than V1Can judge that the battery enters a saturation region, when the capacity is 60 percent or below, the backup energy is insufficient, and the corresponding voltage is V2The voltage hysteresis interval is (V)1，V2) (ii) a It can be understood that too small of the voltage hysteresis interval affects the regulation effect, and too large of the voltage hysteresis interval affects the backup time of off-grid, so the setting of the voltage hysteresis interval should be widened on the premise of ensuring energy backup, and the specific value of the voltage hysteresis interval is set according to backup requirements and battery curves of different manufacturers. This example compares V against the 60% backup capacity and battery charging characteristic curve1Set to 2.27V, V2Set to 2.1V to meet demand; the float voltage was 2.3V. Similarly, the adjusting power can be set according to the system requirements of practical application, the adjusting power is too small, the control precision cannot be identified, the adjusting power is too large, the time of the voltage exceeding a hysteresis zone is shortened, and the adjusting effect is influenced.
Further, the state parameter includes a cell voltage of the storage battery, and the method includes, before the step S22, the steps of:
step S23, acquiring a preset adjusting coefficient, the float charging voltage of the storage battery and the battery voltage;
and step S24, calculating the battery target power according to the preset adjusting coefficient, the float charging voltage and the battery voltage.
The calculation formula of the battery target power is as follows:
PBattery＝k×Vcell×(Vcell-VBat_Bloat)
wherein k is a preset adjusting coefficient.
When the photovoltaic is sufficiently and stably, the actual output MPPT power is equal to the target output power, the system is in a power supply balance state, when the grid connection is switched to the off-grid or the loading and unloading of a load end occur, the power balance state is instantly broken, so that the charging current is increased, referring to fig. 6, when the discharging current is changed from 0.1C to 1C, the voltage of the battery has no sudden change, only the service time is changed greatly, and referring to fig. 5, the voltage rises quickly in a saturation region, so that the battery is overcharged, and even the system is protected by overvoltage.
In the embodiment, the target power of the battery is designed according to the formula, and the expression shows that the target power of the battery is approximately linearly reduced along with the rise of the voltage of the battery in the range from under saturation to saturation without the influence of an adjusting coefficient, and when the voltage of the battery is suddenly changed, the target power of the battery is quickly changed along with the change of the voltage of the battery, so that the impact on the storage battery caused by sudden unloading can be quickly resisted; according to a battery charging characteristic curve, the voltage of a battery is closer to a saturation region, the voltage rising amplitude is larger due to charging power caused by sudden unloading, the adjusting amplitude is larger at the moment, and the overvoltage condition is avoided as much as possible; therefore, in the present embodiment, the preset adjustment coefficients corresponding to different saturation regions are respectively set, specifically, the preset adjustment coefficient is set to k1 in the saturation region, the preset adjustment coefficient is set to k2 in the critical saturation region, and the preset adjustment coefficient is set to k3 in the undersaturation region, so that the target power of the battery is respectively subjected to fine adjustment and amplification in different regions, thereby further reducing the overvoltage probability. In an undersaturation region, the overvoltage possibility caused by sudden unloading is low, the battery target power can be obtained by multiplying the charging current with 0.25C multiplying power commonly used in engineering by the average battery voltage in the undersaturation region, the value of k3 can be calculated according to the formula, the values of k2 and k1 are subjected to fine adjustment and amplification on the basis of k3, and if the values are too large, the power bounce during region transition in the stable charging process can be caused, in the embodiment, k2 is set to be 1.1k3, and k1 is set to be 1.2k 3; on the basis of guaranteeing stable power transition in the stable charging process, the overvoltage protection capability caused by sudden unloading is further enhanced.
The problem of frequent switching charge and discharge of the storage battery is avoided through setting up the voltage hysteresis interval in this embodiment, adjusts battery target power through presetting the adjustment coefficient simultaneously for can in time adjust the appearance of battery target power in order to avoid the excessive pressure problem of battery when the system is undulant.
Further, in a third embodiment of the light storage system control method according to the present invention proposed based on the first embodiment of the present invention, the step S20 includes the steps of:
step S25, when the light storage system is connected to the grid, acquiring a preset over-discharge voltage, and judging whether the battery voltage is smaller than the preset over-discharge voltage;
step S26, if the battery voltage is less than the preset over-discharge voltage, the storage battery is charged through a power grid;
step S27, acquiring a preset recovery voltage, and continuously judging whether the battery voltage is greater than the preset recovery voltage;
and step S28, if the battery voltage is greater than the preset recovery voltage, stopping charging the storage battery through the power grid.
Under the mode is incorporated into the power networks at night to the light storage system, because there is not illumination, the energy storage converter of front end MPPT controller and rear end all can stop work, but the light storage system can maintain the standby, the battery has a undercurrent to discharge this moment, last long time, when being in long-time rainy weather or for the light load power supply for a long time, because the battery energy can not obtain timely replenishment, thereby lead to the battery the problem of degree of depth discharge to appear, and when the battery is in degree of depth insufficient voltage state for a long time, can greatly influence battery life.
The present embodiment sets the preset over-dischargeVoltage and preset recovery voltage, and the preset overdischarge voltage is VL- Δ, preset recovery voltage VL+ Δ, wherein VLFor the discharge end voltage of the accumulator, a protection parameter, in particular VLAnd the value of delta can be set according to the parameters of the storage battery and the actually required standby time or standby time, in the embodiment, VL1.8V, Delta is 0.5V; when the voltage of the battery is lower than the preset over-discharge voltage, the battery is in a deep power shortage state at the moment, and at the moment, a power grid forced charging mechanism is started to charge the storage battery with low power; when the battery voltage of the storage battery reaches the preset recovery voltage, the storage battery is considered to be recovered to a normal state, at the moment, the power grid forced charging mechanism is quitted, the storage battery is stopped to be charged, and the battery is charged when the photovoltaic energy is sufficient. It should be noted that, the user may also define the charging curve segment by himself, and when the battery voltage is in the charging curve segment, the grid forced charging mechanism is started.
The embodiment can avoid the long-time deep insufficient voltage of the storage battery from influencing the service life of the storage battery.
Further, the capacity of the storage battery decreases with the use time, and in the embodiment, the storage battery can be activated in a timed manner at idle time of the storage battery, for example, at night through the power grid to fully charge the storage battery, so that the use capacity loss of the battery after long-time operation can be optimized. The activation period can be set according to actual needs, such as capacity activation once a week or a month.
It should be noted that, for simplicity of description, the above-mentioned method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present application is not limited by the order of acts described, as some steps may occur in other orders or concurrently depending on the application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present application.
The present application further provides an electronic device for implementing the light storage system control method, where the electronic device is applied to the light storage system control method, and the electronic device includes:
the first acquisition module is used for acquiring state parameters of the storage battery;
and the first adjusting module is used for adjusting the running state of the storage battery according to the state parameter.
The control circuit of the light storage system can know the current running state of the storage battery through the state parameters of the storage battery, and adjust the running parameters of the storage battery according to different running states of the storage battery, so that the storage battery can be kept in a stable state aiming at different system conditions, a small-capacity battery is applied to the light storage system, and the battery cost of the light storage system is reduced.
It should be noted that the first obtaining module in this embodiment may be configured to execute step S10 in this embodiment, the first adjusting module in this embodiment may be configured to execute step S20 in this embodiment,
further, the first adjusting module comprises:
the first judgment unit is used for acquiring the battery voltage of the storage battery and a preset voltage hysteresis interval and judging whether the battery voltage is larger than the maximum value of the voltage hysteresis interval or smaller than the minimum value of the voltage hysteresis interval;
the first control unit is used for controlling the storage battery to adjust power to discharge if the battery voltage is larger than the maximum value of the voltage hysteresis interval; if the battery voltage is smaller than the minimum value of the voltage hysteresis zone, controlling the storage battery to be charged with the target battery power; and if the battery voltage is in the voltage hysteresis zone, keeping the current state of the storage battery unchanged.
Further, the first control unit includes:
a first updating subunit, configured to set a battery discharge power of the storage battery to 0, and update the target output power to a sum of the regulation power and the MPPT power.
Further, the state parameter includes a cell voltage of the battery, and the first adjusting module further includes:
a first acquisition unit configured to acquire a preset adjustment coefficient, a float voltage of the storage battery, and the battery voltage;
and the first calculation unit is used for calculating the target power of the battery according to the preset regulation coefficient, the float charging voltage and the battery voltage.
Further, the state parameter includes a cell voltage of the secondary battery; the first adjustment module includes:
the second judgment unit is used for acquiring a preset over-discharge voltage when the control circuit of the optical storage system is connected to the grid and judging whether the battery voltage is smaller than the preset over-discharge voltage or not;
the first execution unit is used for charging the storage battery through a power grid if the battery voltage is smaller than the preset over-discharge voltage;
the second acquisition unit is used for acquiring a preset recovery voltage and continuously judging whether the battery voltage is greater than the preset recovery voltage;
and the second execution unit stops charging the storage battery through the power grid if the battery voltage is greater than the preset recovery voltage.
Further, the electronic device further includes:
the second acquisition module is used for acquiring the battery target power of the storage battery and the MPPT power of the MPPT controller when the optical storage system is connected to the grid;
and the first execution module is used for obtaining the target output power of the energy storage converter according to the target power of the battery and the MPPT power.
Further, the electronic device further includes:
the third acquisition module is used for acquiring the battery voltage of the storage battery and the actual inversion power of the energy storage converter when the optical storage system is off-grid;
and the second execution unit is used for obtaining the target MPPT power of the MPPT controller according to the battery voltage and the actual inverter power.
It should be noted here that the modules described above are the same as the examples and application scenarios implemented by the corresponding steps, but are not limited to the disclosure of the above embodiments. It should be noted that the above modules as a part of the light storage system control circuit may be implemented by software, or may be implemented by hardware, where the hardware environment includes a network environment.
Claims (10)
1. A light storage system control method is characterized by comprising the following steps:
acquiring state parameters of the storage battery;
and adjusting the running state of the storage battery according to the state parameter.
2. The light storage system control method according to claim 1, wherein the state parameter includes a cell voltage of the secondary battery, and the step of adjusting the operation state of the secondary battery according to the state parameter includes:
acquiring the battery voltage of the storage battery and a preset voltage hysteresis interval, and judging whether the battery voltage is greater than the maximum value of the voltage hysteresis interval or less than the minimum value of the voltage hysteresis interval;
if the battery voltage is larger than the maximum value of the voltage hysteresis zone, controlling the storage battery to adjust power to discharge; if the battery voltage is smaller than the minimum value of the voltage hysteresis zone, controlling the storage battery to be charged with the target battery power; and if the battery voltage is in the voltage hysteresis zone, keeping the current state of the storage battery unchanged.
3. The light storage system control method of claim 2, wherein the step of controlling the storage battery to adjust power for discharging comprises:
setting the battery discharge power of the storage battery to 0, and updating the target output power to the sum of the regulation power and the MPPT power.
4. The light storage system control method of claim 2, wherein the state parameter comprises a cell voltage of the secondary cell, and the step before controlling the secondary cell to charge at the cell target power further comprises:
acquiring a preset adjusting coefficient, the float charge voltage of the storage battery and the battery voltage;
and calculating to obtain the target power of the battery according to the preset adjusting coefficient, the float charging voltage and the battery voltage.
5. The light storage system control method according to claim 1, wherein the state parameter includes a cell voltage of a secondary cell; the step of adjusting the operating state of the battery according to the state parameter includes:
when the optical storage system is connected to the grid, acquiring a preset over-discharge voltage, and judging whether the battery voltage is smaller than the preset over-discharge voltage or not;
if the battery voltage is less than the preset over-discharge voltage, charging the storage battery through a power grid;
acquiring a preset recovery voltage, and continuously judging whether the battery voltage is greater than the preset recovery voltage;
and if the battery voltage is greater than the preset recovery voltage, stopping charging the storage battery through the power grid.
6. The light storage system control method of claim 1, wherein the method further comprises:
when the light storage system is connected to the grid, acquiring the battery target power of the storage battery and the MPPT power of the MPPT controller;
and obtaining the target output power of the energy storage converter according to the target power of the battery and the MPPT power.
7. The light storage system control method of claim 1, wherein the method further comprises:
when the optical storage system is off-grid, acquiring the battery voltage of the storage battery and the actual inversion power of the energy storage converter;
and obtaining the target MPPT power of the MPPT controller according to the battery voltage and the actual inverter power.
8. A light storage system control circuit is applied to the light storage system control method of any one of claims 1 to 7, and comprises an MPPT controller, a storage battery and a storage converter; the input end of the MPPT controller is connected with a solar component, the output end of the MPPT controller is respectively connected with the storage battery and the energy storage converter, the storage battery is also connected with the energy storage converter, the alternating current output end of the energy storage converter is used as the output end of the control circuit of the light storage system, the energy storage converter comprises a central controller, and the central controller is respectively connected with the MPPT controller and the storage battery; wherein:
and the central controller is used for acquiring the state parameters of the storage battery and adjusting the running state of the storage battery according to the state parameters.
9. A light storage system comprising a solar module and a light storage system control circuit as claimed in claim 8, the solar module being connected to the light storage system control circuit.
10. An electronic device applied to the light storage system control method according to any one of claims 1 to 7, the electronic device comprising:
the first acquisition module is used for acquiring state parameters of the MPPT controller and the storage battery;
and the first adjusting module is used for adjusting the running state of the storage battery according to the state parameter.
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