CN112531771B - Off-grid MPPT control device and method for hybrid energy storage inverter - Google Patents
Off-grid MPPT control device and method for hybrid energy storage inverter Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
- H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The off-grid MPPT control device and method for the hybrid energy storage inverter comprises a PV working voltage sampling part, a PV working voltage sampling part and an MPPT controller, wherein the MPPT controller is used for tracking a control voltage V of a disturbance photovoltaic panel PV ref DC bus voltage sampling part, battery current sampling part, UPS voltage sampling part, UPS current sampling part, control part and the like, stops MPPT at off-grid operation moment, and determines the current V first PV And V is equal to mpp Relationship, resampling load current I ups The MPPT control link is introduced, MPPT tracking is performed at the first time of UPS load change, and the PV output power is rapidly changed, so that the PV conversion efficiency is improved, the off-grid load capacity of the system is improved, meanwhile, the battery is prevented from being charged and discharged frequently, and the service life of the hybrid energy storage system is prolonged.
Description
Technical Field
The invention relates to the field of hybrid energy storage inverters, in particular to an off-grid MPPT control device and method for a hybrid energy storage inverter.
Background
Off-grid operation is a very important application scenario for hybrid energy storage inverters, but due to the uncertainty of the off-grid load and the power characteristics of the PV panel itself, hybrid energy storage inverters are difficult to operate at the maximum power point of the PV panel under off-grid operation conditions.
When the hybrid energy storage inverter runs off the grid, one of the prior technical schemes is to directly stop MPPT tracking when the system is off the grid, the PV side directly works near the open-circuit voltage of the PV, and the load power is provided by the battery and the current PV. The scheme has low power conversion efficiency at the PV side, and the load capacity of the whole system from a net belt is relatively poor.
In another technical scheme, when the system runs off-grid, energy is output from a battery side for loading, after the system is stable, the power of the PV side is increased through MPPT (Maximum PowerPoint Tracking maximum power point tracking), and the output power of the battery is reduced until the balance is achieved.
According to the scheme, when a load is cut in, the battery is powered by the battery, the battery is cut out through MPPT after the system is stable, the energy of the PV side is not fully utilized, meanwhile, the battery module is cut in to discharge too early, the loss of the battery is increased, and the service life of the whole system is reduced.
The PV side power conversion efficiency of the prior art scheme is low, the off-grid band carrying capacity is poor, the battery loss is large, and the service life of the whole system is reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing the off-grid MPPT control device and the method for the hybrid energy storage inverter, so that the PV power conversion efficiency is improved when the system runs off-grid, the off-grid load capacity of the system is improved, and meanwhile, the consumption of a battery is not increased, so that the service life of the hybrid energy storage system is prolonged.
The invention is realized by the following technical scheme:
hybrid energy storage DC-to-ac converter off-Grid MPPT controlling means, hybrid energy storage DC-to-ac converter's direct current side DC/DC1 connects photovoltaic panel PV, and battery module BAT is connected to DC/DC2, and the interchange side divide into two-way, grid side direct connection electric wire netting, UPS side connection UPS load, its characterized in that still includes: a PV operating voltage sampling section for sampling a current operating voltage V of a photovoltaic panel PV PV Continuously sampling;
a PV operating current sampling section for sampling the current operating current I of the photovoltaic panel PV PV Continuously sampling;
MPPT controller for tracking control voltage V of a disturbance photovoltaic panel PV ref ；
A DC bus voltage sampling unit for continuously sampling the current operating voltage of the DC bus;
a battery voltage sampling part for sampling a current operating voltage V of the battery module BAT bat Continuously sampling;
a battery current sampling section for sampling a present operating current I of the battery module BAT bat Continuously sampling;
a UPS voltage sampling part for sampling the current operating voltage V of the UPS side ups Continuously sampling;
a UPS current sampling unit for sampling a current I of a UPS side ups Continuously sampling;
a control unit that receives the sampling signals from the sampling units and the monitoring signals from the photovoltaic panel PV and the battery module BAT, and controls the MPPT controller, the photovoltaic panel PV, and the battery module BAT to perform the following operations:
s1, when the hybrid energy storage inverter runs off-grid, the MPPT controller pauses MPPT control and does not track disturbance control voltage v any more ref Stabilizing the PV output power of the photovoltaic panel; the control part adjusts the voltage of the direct current bus to enable the sampling value of the voltage of the direct current bus to be stabilized within a set range; MPPT controller initialization V ref(0) ＝0.8*V open ，V open An open circuit voltage for the photovoltaic panel PV;
s2, MPPT controller fixed step disturbance control voltage v ref Once, let V ref(1) ＝V ref(0) +DeltaV, deltaV is a preset parameter value, and the control part adjusts V PV Make V PV ＝V ref(1) Then according to the charge and discharge states of the battery module BAT and I bat Determination of the change in condition V PV Maximum power point voltage V with photovoltaic panel PV mpp Is the relation of: if the post-disturbance I is the above-mentioned when the battery module BAT is in a charged state bat If the number increases, then determine V PV ＜V mpp Otherwise V PV ＞V mpp The method comprises the steps of carrying out a first treatment on the surface of the When the battery module BAT is in a discharging state, if the post-disturbance I bat If the number increases, then determine V PV ＞V mpp The method comprises the steps of carrying out a first treatment on the surface of the Otherwise V PV ＜V mpp ；
S3, the MPPT controller restarts MPPT control, and the control part records the sampling initial value I of UPS working current ups(0) Will I ups In MPPT control, MPPT tracking is rapidly performed along with UPS load change:
absolute value of UPS working current difference (delta I) between the kth sampling period and the (k-1) th sampling period ups |≤I limit When MPPT controller does not disturb control voltage v ref ；
Absolute value of UPS working current difference (delta I) between the kth sampling period and the (k-1) th sampling period ups |＞I limit When the MPPT controller starts the (n+1) th MPPT control period after the (n+1) th MPPT control period is started, the control unit starts the (n+1) th MPPT control period, and updates the MPPT control period ref(n+1) Performing variable step disturbance: v (V) ref(n+1) ＝V ref(n) +ΔV 1 ；
Wherein: i delta I ups |＝|I ups(k) -I ups(k-1) |；
ΔV 1 ＝K 1 *|ΔI ups |；
k. n is an integer more than or equal to 1;
I limit the UPS load change judging method is used for judging whether the UPS load change is overlarge when the network is disconnected or not according to preset parameter values;
K 1 to preset parameter value, K 1 The positive and negative laws of (2) are as follows:
when DeltaI ups At > 0, the UPS load power increases after off-grid: if V is determined in the above S2 PV ＜V mpp Then V needs to be increased ref(n+1) ，K 1 Taking a positive value; if V is determined in the above S2 PV ＞V mpp Then V needs to be reduced ref(n+1) ，K 1 Taking a negative value; when DeltaI ups <At 0, the UPS load power is reduced after off-grid: if V is determined in the above S2 PV ＜V mpp Then V needs to be reduced ref(n+1) ，K 1 Taking a negative value; if it is determined in S2 that: v (V) PV ＞V mpp Then V needs to be increased ref(n+1) ，K 1 Taking a positive value;
s4, stopping variable step disturbance control voltage v by the MPPT controller ref(n+1) Control unit adjusts battery power determination：
When DeltaI in S3 ups When the MPPT control period is more than 0, the MPPT controller controls the V of the (n+1) th MPPT control period ref(n+1) After the step-variable disturbance, the control part adjusts V PV(n+1) ＝V ref(n+1) : if at this time the power of the photovoltaic panel PV varies Δp=p pv(n+1) -P pv(n) < preset parameter value P limit1 Then the MPPT controller stops the disturbance control voltage v when the photovoltaic panel PV is operated near the maximum power point and the UPS load power is overlarge ref The control part adjusts the battery power according to the current state of the battery module BAT; if at this time the power of the photovoltaic panel PV varies Δp=p pv(n+1) -P pv(n) ≥P limit1 The MPPT controller finishes the current control period and returns to S3;
when DeltaI in S3 ups <At 0, the MPPT controller is operating at V for the (n+1) th MPPT control period ref(n+1) After the step-variable disturbance, the control part adjusts V PV(n+1) ＝V ref(n+1) : if at this time the power P of the photovoltaic panel PV pv(n+1) < preset parameter value P limit2 Then the MPPT controller stops the disturbance control voltage v when the photovoltaic panel PV basically works at the open circuit voltage or the vicinity of the lowest voltage of the system and the UPS load power is smaller ref The control part adjusts the battery power according to the current state of the battery module BAT; if at this time the power P of the photovoltaic panel PV pv(n+1) ≥P limit2 The MPPT controller finishes the current control period and returns to S3;
wherein: p (P) pv(n+1) ＝V PV(n+1) *I PV(n+1) ；P pv(n) ＝V PV(n) *I PV(n) 。
Further, the S4, ΔI in S3 ups When the current state of the battery module BAT is more than 0, the control part adjusts the battery power as follows: when the battery module BAT is in a discharging state, the battery power is increased, and when the battery module BAT is in a charging state, the battery power is reduced to ensure that the current photovoltaic panel PV and the battery module BAT power can meet the UPS load power requirement, i.e. (P) pv +K 2 *P bat )*K 3 ＝P ups +P limit3 ；
Wherein: p (P) pv For the current PV power, P pv ＝V PV *I PV ；
P bat P is the current battery power bat ＝V bat *I bat ；
P ups For the current load power, P ups ＝V ups *I ups ；
K 2 For the current battery charge-discharge state, typically 1 represents discharge, -1 represents charge;
K 3 for the conversion efficiency of the current hybrid energy storage inverter, the hybrid energy storage inverters with different types, and the working time K 3 Typically between about 85% and 98% float;
P limit3 for power comparison a preset threshold, P limit3 Typically 0 to 500W.
Further, the S4, ΔI in S3 ups <At 0, the control section adjusts the battery power according to the current state of the battery module BAT as follows: when the battery module BAT is in a discharging state, the battery power is reduced, and when the battery module BAT is in a charging state, the battery power is increased to ensure that the power of the current photovoltaic panel PV and the battery module BAT can meet the UPS load power requirement, i.e. (P) pv +K 2 *P bat )*K 3 ＝P ups +P limit3 ；
Wherein:
P pv for the current PV power, P pv ＝V PV *I PV ；
P bat P is the current battery power bat ＝V bat *I bat ；
P ups For the current load power, P ups ＝V ups *I ups ；
K 2 For the current battery charge-discharge state, typically 1 represents discharge, -1 represents charge;
K 3 for the conversion efficiency of the current hybrid energy storage inverter, the hybrid energy storage inverters with different types, and the working time K 3 Typically about 85% to 98%Floating between the two;
P limit3 for power comparison a preset threshold, P limit3 ＝0～500W。
Further, the preset parameter value Δv is different types of photovoltaic panels PV, Δv=1 to 10V; the preset parameter value I limit Hybrid energy storage inverters of different types, I limit ＝1～5A；
The preset parameter value K 1 V when the load is cut in according to different types of photovoltaic panels PV and UPS PV Debug determination, K 1 -10 to 10; the preset parameter value P limit1 Different types of photovoltaic panels PV, P thereof limit1 =0 to 500W; the preset parameter value P limit2 Different types of photovoltaic panels PV, P thereof limit2 ＝10～500W。
The off-grid MPPT control method of the hybrid energy storage inverter comprises the following steps:
s1, when the hybrid energy storage inverter runs off-grid, MPPT control is suspended, and the PV control voltage V of the disturbance photovoltaic panel is not tracked any more ref Stabilizing the PV output power of the photovoltaic panel; adjusting the voltage of the direct current bus to enable the sampling value of the voltage of the direct current bus to be stabilized within a set range; initializing V ref(0) ＝0.8*V open ，V open An open circuit voltage for the photovoltaic panel PV;
s2, disturbance control voltage v with fixed step length ref Once, let V ref(1) ＝V ref(0) +DeltaV, deltaV is a preset parameter value, and V is adjusted PV Make V PV ＝V ref(1) Then based on the charge and discharge state of the battery module BAT and the battery current sampling value I bat Determination of the change in condition V PV Maximum power point voltage V with photovoltaic panel PV mpp Is the relation of:
if the post-disturbance I is the above-mentioned when the battery module BAT is in a charged state bat If the number increases, then determine V PV ＜V mpp Otherwise V PV ＞V mpp The method comprises the steps of carrying out a first treatment on the surface of the When the battery module BAT is in a discharging state, if the post-disturbance I bat If the number increases, then determine V PV ＞V mpp The method comprises the steps of carrying out a first treatment on the surface of the Otherwise V PV ＜V mpp ；
S3, restarting MPPT control, and sampling UPS working current I ups PV operating voltage V PV PV operating current I PV Recording the sampling initial value I of UPS working current ups(0) Will I ups In MPPT control, MPPT tracking is rapidly performed along with UPS load change:
absolute value of UPS working current difference (delta I) between the kth sampling period and the (k-1) th sampling period ups |≤I limit When not disturbing the control voltage v ref ；
Absolute value of UPS working current difference (delta I) between the kth sampling period and the (k-1) th sampling period ups |＞I limit In this case, the current (n+1) th MPPT control period is terminated and the (n+1) th MPPT control period is started in advance, so that the MPPT control period is updated faster, and the (n+1) th MPPT control period is used for the control of V ref(n+1) Performing variable step disturbance: v (V) ref(n+1) ＝V ref(n) +ΔV 1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein:
|ΔI ups |＝|I ups(k) -I ups(k-1) |；
ΔV 1 ＝K 1 *|ΔI ups |；
k. n is an integer more than or equal to 1;
I limit the UPS load change judging method is used for judging whether the UPS load change is overlarge when the network is disconnected or not according to preset parameter values;
K 1 to preset parameter value, K 1 The positive and negative laws of (2) are as follows:
when DeltaI ups At > 0, the UPS load power increases after off-grid: if V is determined in the above S2 PV ＜V mpp Then V needs to be increased ref(n+1) ，K 1 Taking a positive value; if V is determined in the above S2 PV ＞V mpp Then V needs to be reduced ref(n+1) ，K 1 Taking a negative value;
when DeltaI ups <At 0, the UPS load power is reduced after off-grid: if V is determined in the above S2 PV ＜V mpp Then V needs to be reduced ref(n+1) ，K 1 Taking a negative value; if it is determined in S2 that: v (V) PV ＞V mpp Then V needs to be increased ref(n+1) ，K 1 Taking a positive value;
s4, stopping the variable step disturbance control voltage v ref(n+1) And (3) adjusting battery power judgment:
when DeltaI in S3 is as above ups At > 0, V for the (n+1) th MPPT control period ref(n+1) After step-variable disturbance, V is adjusted PV(n+1) ＝V ref(n+1) If at this time the power of the photovoltaic panel PV varies Δp=p pv(n+1) -P pv(n) < preset parameter value P limit1 Then the photovoltaic panel PV is operated near the maximum power point, the UPS load power is overlarge, and the disturbance control voltage v is stopped ref And adjusts battery power according to the current state of the battery module BAT; if at this time the power of the photovoltaic panel PV varies Δp=p pv(n+1) -P pv(n) ≥P limit1 Ending the current MPPT control period, and returning to the step S3;
wherein: p (P) pv(n+1) ＝V PV(n+1) *I PV(n+1) ；P pv(n) ＝V PV(n) *I PV(n) ；
When DeltaI in S3 is as above ups <0, V for the (n+1) th MPPT control period ref(n+1) After step-variable disturbance, V is adjusted PV(n+1) ＝V ref(n+1) : if at this time the power P of the photovoltaic panel PV pv(n+1) < preset parameter value P limit2 Then the photovoltaic panel PV is basically operated at the open circuit voltage or the vicinity of the lowest voltage of the system, the UPS load power is smaller, and the disturbance control voltage v is stopped ref And adjusts battery power according to the current state of the battery module BAT; if at this time the power P of the photovoltaic panel PV pv(n+1) ≥P limit2 And (3) ending the current MPPT control period, and returning to the step (S3).
Further, the S4, when ΔI in S3 ups At > 0, the battery power is adjusted according to the current state of the battery module BAT as follows: sampling the current operating voltage V of the battery module BAT bat Current operating current I bat Current operating voltage V on UPS side ups Increasing the electricity when the battery module BAT is in a discharge stateCell power, when the battery module BAT is in a charged state, is reduced to ensure that the current photovoltaic panel PV and battery module BAT power meet UPS load power requirements, i.e. (P pv +K 2 *P bat )*K 3 ＝P ups +P limit3 ；
Wherein: p (P) pv For the current PV power, P pv ＝V PV *I PV ；
P bat P is the current battery power bat ＝V bat *I bat ；
P ups For the current load power, P ups ＝V ups *I ups ；
K 2 For the current battery charge-discharge state, typically 1 represents discharge, -1 represents charge;
K 3 for the conversion efficiency of the current hybrid energy storage inverter, the hybrid energy storage inverters with different types, and the working time K 3 Typically between about 85% and 98% float; p (P) limit3 For power comparison a preset threshold, P limit3 Typically 0 to 500W.
Further, the S4, when ΔI in S3 ups <0, the battery power is adjusted according to the current state of the battery module BAT as follows: sampling the current operating voltage V of the battery module BAT bat Current operating current I bat Current operating voltage V on UPS side ups When the battery module BAT is in a discharging state, the battery power is reduced, and when the battery module BAT is in a charging state, the battery power is increased to ensure that the power of the current photovoltaic panel PV and the battery module BAT can meet the UPS load power requirement, i.e. (P) pv +K 2 *P bat )*K 3 ＝P ups +P limit3 ；
Wherein:
P pv for the current PV power, P pv ＝V PV *I PV ；
P bat P is the current battery power bat ＝V bat *I bat ；
P ups For the current load power, P ups ＝V ups *I ups ；
K 2 For the current battery charge-discharge state, typically 1 represents discharge, -1 represents charge;
K 3 for the conversion efficiency of the current hybrid energy storage inverter, the hybrid energy storage inverters with different types, and the working time K 3 Typically between about 85% and 98% float;
P limit3 for power comparison a preset threshold, P limit3 Typically 0 to 500W.
Further, the preset parameter value Δv is different types of photovoltaic panels PV, Δv=1 to 10V; the preset parameter value I limit Hybrid energy storage inverters of different types, I limit ＝1～5A；
The preset parameter value K 1 V when the load is cut in according to different types of photovoltaic panels PV and UPS PV Debug determination, K 1 -10 to 10; the preset parameter value P limit1 Different types of photovoltaic panels PV, P thereof limit1 =0 to 500W; the preset parameter value P limit2 Different types of photovoltaic panels PV, P thereof limit2 ＝10～500W。
The invention has the beneficial effects that: at off-grid operation moment, MPPT is stopped, the control part is used for stabilizing the voltage of the direct current bus, stabilizing the output power of the PV voltage, and then initializing V ref Then one fixed step disturbance is carried out to determine the current V PV And V is equal to mpp Is used for sampling the load current I ups Introducing the MPPT control link into an MPPT control link, carrying out MPPT tracking and variable step disturbance at the first time of UPS load change, and carrying out variable step disturbance according to load current I ups The change condition of the (a) and the position of the PV working voltage point are used for rapidly changing the PV output power, so that the PV conversion efficiency is improved, the off-grid load capacity of the system is improved, meanwhile, the battery is prevented from being charged and discharged frequently, and the service life of the hybrid energy storage system is prolonged.
Drawings
Fig. 1 is a system connection block diagram of an off-grid MPPT control device of a hybrid energy storage inverter
FIG. 2 is a graph of a photovoltaic panel PV
Fig. 3 is a flow chart of a hybrid energy storage inverter off-grid MPPT control method
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, a direct-current side DC/DC1 of the hybrid energy storage inverter is connected to a photovoltaic panel PV, a DC/DC2 is connected to a battery module BAT, an alternating-current side is divided into two paths, a Grid side is directly connected to a power Grid, and a UPS side is connected to a UPS load; a PV working voltage sampling part for sampling the current working voltage V of the PV panel PV PV Continuously sampling; a PV operating voltage sampling section for sampling the current I of the photovoltaic panel PV PV Continuously sampling; MPPT controller for tracking control voltage V of a disturbance photovoltaic panel PV ref The method comprises the steps of carrying out a first treatment on the surface of the A DC bus voltage sampling unit for continuously sampling the current operating voltage of the DC bus; a battery voltage sampling part for sampling a current operating voltage V of the battery module BAT bat Continuously sampling; a battery current sampling section for sampling a present operating current I of the battery module BAT bat Continuously sampling; a UPS voltage sampling part for sampling the current operating voltage V of the UPS side ups Continuously sampling; a UPS current sampling unit for sampling a current I of a UPS side ups Continuously sampling; and the control part is used for receiving the sampling signals of the sampling parts and the monitoring signals of the photovoltaic panel PV and the battery module BAT and controlling the MPPT controller, the photovoltaic panel PV and the battery module BAT to execute corresponding operations.
As shown in fig. 3, the specific operation steps are as follows:
s1, when the hybrid energy storage inverter runs off-grid, the MPPT controller pauses MPPT control and does not track disturbance control voltage v any more ref Stabilizing the PV output power of the photovoltaic panel; the control part adjusts the voltage of the direct current bus through the BAT control loop to enable the sampling value of the voltage of the direct current bus to be stabilized within a set range; MPPT controller initialization V ref(0) ＝0.8*V open ，V open Is the open circuit voltage of the photovoltaic panel PV.
S2, MPPT controller fixed step disturbance control voltage v ref Once, let V ref(1) ＝V ref(0) +DeltaV, deltaV is a preset parameter value, the DeltaV of different types of photovoltaic panels PV is usually about 1-10V, and the control part adjusts V through a PV control loop PV Make V PV ＝V ref(1) The method comprises the steps of carrying out a first treatment on the surface of the As can be seen from the PV curve of the photovoltaic panel, as shown in fig. 2, the same output power of the photovoltaic panel PV except for the maximum power point corresponds to two possible operating voltage values V in the PV curve 1 、V 2 Then according to the charge and discharge state of the battery module BAT and the current battery current sampling value I bat Can determine V PV Maximum power point voltage V with photovoltaic panel PV mpp Is the relation of:
(1) If the post-disturbance I is the above-mentioned when the battery module BAT is in a charged state bat If the number increases, then determine V PV ＜V mpp I.e. V PV MPP left side, V at maximum power point in PV curve 1 Position of (c), otherwise V PV ＞V mpp I.e. V PV Right side, V at maximum power point in the PV curve 2 Is a position of (2);
(2) When the battery module BAT is in a discharging state, if the post-disturbance I bat If the number increases, then determine V PV ＞V mpp I.e. right side, V of the maximum power point in the PV curve 2 Is a position of (2); otherwise V PV ＜V mpp I.e. MPP left, V at maximum power point in the PV curve 1 Is a position of (2);
s3, the MPPT controller restarts MPPT control, and the control part records the sampling initial value I of UPS working current ups(0) Will I ups In MPPT control, MPPT tracking is rapidly performed along with UPS load change:
(1) Absolute value of UPS working current difference (delta I) between the kth sampling period and the (k-1) th sampling period ups |≤I limit When MPPT controller does not disturb control voltage v ref ；
(2) Absolute value of UPS working current difference (delta I) between the kth sampling period and the (k-1) th sampling period ups |＞I limit In this case, the control unit ends the nMPPT control period currently being executed by the MPPT controller in advance and starts the (n+1) th MPPT control periodThereby accelerating the update of MPPT control period, and the MPPT controller updates V in the (n+1) th MPPT control period ref(n+1) Performing variable step disturbance: v (V) ref(n+1) ＝V ref(n) +ΔV 1 ；
Wherein:
|ΔI ups |＝|I ups(k) -I ups(k-1) |；
ΔV 1 ＝K 1 *|ΔI ups |；
k. n is an integer more than or equal to 1;
I limit for presetting parameter values, the method is used for judging whether the UPS load change is excessive during off-grid, and the mixed energy storage inverters of different types are I limit Typically 1 to 5A;
K 1 for preset parameter values, according to V when different photovoltaic panels PV and UPS loads are cut in PV Debug determination, K 1 Typically from-10 to 10, K 1 The positive and negative laws of (2) are as follows:
(1) when DeltaI ups At > 0, the UPS load power increases after off-grid: if V is determined in the above S2 PV ＜V mpp I.e. V PV MPP left side, V at maximum power point in PV curve 1 At this time, V needs to be increased ref(n+1) ，K 1 Taking a positive value; if V is determined in the above S2 PV ＞V mpp I.e. V PV Right side, V at maximum power point in the PV curve 2 Is to reduce V at this time ref(n+1) ，K 1 Taking a negative value;
(2) when DeltaI ups <At 0, the UPS load power is reduced after off-grid: if V is determined in the above S2 PV ＜V mpp I.e. V PV MPP left side, V at maximum power point in PV curve 1 Then V needs to be reduced at this time ref(n+1) ，K 1 Taking a negative value; if V is determined in the above S2 PV ＞V mpp I.e. V PV Right side, V at maximum power point in the PV curve 2 At this time, V needs to be increased ref(n+1) ，K 1 Taking a positive value;
s4, stopping variable step disturbance control by the MPPT controllerVoltage v ref(n+1) The control unit adjusts the battery power judgment:
(1) When DeltaI in S3 is as above ups When the MPPT control period is more than 0, the MPPT controller controls the V of the (n+1) th MPPT control period ref(n+1) After the step-variable disturbance, the control part adjusts V PV(n+1) ＝V ref(n+1) ：
(1) If at this time the power of the photovoltaic panel PV varies Δp=p pv(n+1) -P pv(n) ＜P limit1 Then the MPPT controller stops the disturbance control voltage v when the photovoltaic panel PV is operated near the maximum power point and the UPS load power is overlarge ref The control unit adjusts the battery power according to the current state of the battery module BAT: when the battery module BAT is in a discharging state, the battery power is increased, and when the battery module BAT is in a charging state, the battery power is reduced to ensure that the current photovoltaic panel PV and the battery module BAT power can meet the UPS load power requirement, i.e. (P) pv +K 2 *P bat )*K 3 ＝P ups +P limit3 The method comprises the steps of carrying out a first treatment on the surface of the Wherein:
P pv(n+1) ＝V PV(n+1) *I PV(n+1) 、P pv(n) ＝V PV(n) *I PV(n) ；
P limit1 for preset parameter values, different types of photovoltaic panels PV, P thereof limit1 Typically 0 to 500W;
P pv for the current PV power, P pv ＝V PV *I PV ；
P bat P is the current battery power bat ＝V bat *I bat ，V bat 、I bat All are sampling values; t
P ups for the current load power, P ups ＝V ups *I ups ，V ups 、I ups All are sampling values;
K 2 representing a value for the charge and discharge state of the current battery, wherein 1 represents discharge and-1 represents charge;
K 3 for the conversion efficiency of the current hybrid energy storage inverter, the hybrid energy storage inverters with different types, and the working time K 3 Typically between about 85% and 98% float;
P limit3 for power comparison a preset threshold, P limit3 Typically 0 to 500W;
(2) if at this time the power of the photovoltaic panel PV varies Δp=p pv(n+1) -P pv(n) ≥P limit1 The MPPT controller finishes the current control period and returns to S3;
(2) When DeltaI in S3 is as above ups <At 0, the MPPT controller is operating at V for the (n+1) th MPPT control period ref(n+1) After the step-variable disturbance, the control part adjusts V PV(n+1) ＝V ref(n+1) ：
(1) If at this time the power P of the photovoltaic panel PV pv(n+1) ＜P limit2 Then the MPPT controller stops the disturbance control voltage v when the photovoltaic panel PV basically works at the open circuit voltage or the vicinity of the lowest voltage of the system and the UPS load power is smaller ref The control unit adjusts the battery power according to the current state of the battery module BAT: when the battery module BAT is in a discharging state, the battery power is reduced, and when the battery module BAT is in a charging state, the battery power is increased so as to ensure that the current photovoltaic panel PV and the battery module BAT power can meet the UPS load power requirement, namely
(P pv +K 2 *P bat )*K 3 ＝P ups +P limit3 ；
Wherein: p (P) limit2 For preset parameter values, different types of photovoltaic panels PV, P thereof limit2 Typically 10 to 500W;
P pv for the current PV power, P pv ＝V PV *I PV ；
P bat P is the current battery power bat ＝V bat *I bat ，V bat 、I bat All are sampling values; t
P ups for the current load power, P ups ＝V ups *I ups ，V ups 、I ups All are sampling values;
K 2 for representing the current charge and discharge state of the battery, the table is generally 1Showing discharge, -1 representing charge;
K 3 for the conversion efficiency of the current hybrid energy storage inverter, the hybrid energy storage inverters with different types, and the working time K 3 Typically between about 85% and 98% float;
P limit3 for power comparison a preset threshold, P limit3 Typically 0 to 500W;
(2) if at this time the power P of the photovoltaic panel PV pv(n+1) ≥P limit2 And (3) ending the current control period of the MPPT controller, and returning to the step (S3).
Claims (8)
1. Hybrid energy storage DC-to-ac converter off-Grid MPPT controlling means, hybrid energy storage DC-to-ac converter's direct current side DC/DC1 connects photovoltaic panel PV, and battery module BAT is connected to DC/DC2, and the interchange side divide into two-way, grid side direct connection electric wire netting, UPS side connection UPS load, its characterized in that still includes:
a PV operating voltage sampling section for sampling a current operating voltage V of a photovoltaic panel PV pv Continuously sampling;
a PV operating current sampling section for sampling the current operating current I of the photovoltaic panel PV pv Continuously sampling;
MPPT controller for tracking control voltage V of a disturbance photovoltaic panel PV ref ；
A DC bus voltage sampling unit for continuously sampling the current operating voltage of the DC bus;
a battery voltage sampling part for sampling a current operating voltage V of the battery module BAT bat Continuously sampling;
a battery current sampling section for sampling a present operating current I of the battery module BAT bat Continuously sampling;
a UPS voltage sampling part for sampling the current operating voltage V of the UPS side ups Continuously sampling;
a UPS current sampling unit for sampling a current I of a UPS side ups Continuously sampling;
a control unit that receives the sampling signals from the sampling units and the monitoring signals from the photovoltaic panel PV and the battery module BAT, and controls the MPPT controller, the photovoltaic panel PV, and the battery module BAT to perform the following operations:
s1, when the hybrid energy storage inverter runs off-grid, the MPPT controller pauses MPPT control and does not track the control voltage V of the disturbance photovoltaic panel PV any more ref Stabilizing the PV output power of the photovoltaic panel; the control part adjusts the voltage of the direct current bus to enable the sampling value of the voltage of the direct current bus to be stabilized within a set range; MPPT controller initialization V ref(0) ＝0.8*V open ，V open An open circuit voltage for the photovoltaic panel PV;
s2, MPPT controller fixed step disturbance control voltage V ref Once, let V ref(1) ＝V ref(0) +DeltaV, deltaV is a preset parameter value, and the control part adjusts V pv Make V pv ＝V ref(1) Then according to the charge and discharge states of the battery module BAT and I bat Determination of the change in condition V PV Maximum power point voltage V with photovoltaic panel PV mpp Is the relation of:
if the post-disturbance I is the above-mentioned when the battery module BAT is in a charged state bat If the number increases, then determine V pv ＜V mpp Otherwise V pv ＞V mpp ；
When the battery module BAT is in a discharging state, if the post-disturbance I bat If the number increases, then determine V pv ＞V mpp The method comprises the steps of carrying out a first treatment on the surface of the Otherwise V pv ＜V mpp ；
S3, the MPPT controller restarts MPPT control, and the control part records the sampling initial value I of UPS working current ups(0) Will I ups In MPPT control, MPPT tracking is rapidly performed along with UPS load change:
absolute value of UPS working current difference (delta I) between the kth sampling period and the (k-1) th sampling period ups |≤I limit When MPPT controller does not disturb control voltage V ref ；
Absolute value of UPS working current difference (delta I) between the kth sampling period and the (k-1) th sampling period ups |＞I limit In this case, the control unit ends the (n+1) th MPPT control period and starts the (n+1) th MPPT control period in advance, thereby accelerating the MPPT control period update and the MPPT controlThe device controls the period of (n+1) th MPPT for V ref(n+1) Performing variable step disturbance:
V ref(n+1) ＝V ref(n) +ΔV 1 ；
wherein: i delta I ups |＝|I ups(k) -I ups(k-1) |；
ΔV 1 ＝K 1 *|ΔI ups |；
k. n is an integer more than or equal to 1; i limit The UPS load change judging method is used for judging whether the UPS load change is overlarge when the network is disconnected or not according to preset parameter values;
K 1 to preset parameter value, K 1 The positive and negative laws of (2) are as follows:
when DeltaI ups At > 0, the UPS load power increases after off-grid: if V is determined in the above S2 pv ＜V mpp Then V needs to be increased ref(n+1) ，K 1 Taking a positive value; if V is determined in the above S2 pv ＞V mpp Then V needs to be reduced ref(n+1) ，K 1 Taking a negative value; when DeltaI ups <At 0, the UPS load power is reduced after off-grid: if V is determined in the above S2 pv ＜V mpp Then V needs to be reduced ref(n+1) ，K 1 Taking a negative value; if it is determined in S2 that: v (V) pv ＞V mpp Then V needs to be increased ref(n+1) ，K 1 Taking a positive value;
s4, stopping variable step disturbance control voltage V by the MPPT controller ref(n+1) The control unit adjusts the battery power judgment:
when DeltaI in S3 ups When the MPPT control period is more than 0, the MPPT controller controls the V of the (n+1) th MPPT control period ref(n+1) After the step-variable disturbance, the control part adjusts V pv(n+1) ＝V ref(n+1) : if at this time the power of the photovoltaic panel PV varies Δp=p PV(n+1) -P PV(n) < preset parameter value P limit1 The MPPT controller stops the disturbance control voltage V when the photovoltaic panel PV is operated near the maximum power point and the UPS load power is overlarge ref The control part adjusts the battery power according to the current state of the battery module BAT; if at this time the power of the photovoltaic panel PV varies Δp=p PV(n+1) -P PV(n) ≥P limit1 The MPPT controller finishes the current control period and returns to S3;
when DeltaI in S3 ups <At 0, the MPPT controller is operating at V for the (n+1) th MPPT control period ref(n+1) After the step-variable disturbance, the control part adjusts V PV(n+1) ＝V ref(n+1) : if at this time the power P of the photovoltaic panel PV PV(n+1) < preset parameter value P limit2 Then the MPPT controller stops the disturbance control voltage V when the photovoltaic panel PV basically works at the open circuit voltage or the vicinity of the lowest voltage of the system and the UPS load power is smaller ref The control part adjusts the battery power according to the current state of the battery module BAT; if at this time the power P of the photovoltaic panel PV PV(n+1) ≥P limit2 The MPPT controller finishes the current control period and returns to S3;
wherein: p (P) PV(n+1) ＝V PV(n+1) *I PV(n+1) ；P PV(n) ＝V PV(n) *I PV(n) 。
2. The hybrid energy storage inverter off-grid MPPT control device of claim 1, wherein S4, Δi in S3 ups When the current state of the battery module BAT is more than 0, the control part adjusts the battery power as follows: when the battery module BAT is in a discharging state, the battery power is increased, and when the battery module BAT is in a charging state, the battery power is reduced to ensure that the current photovoltaic panel PV and the battery module BAT power can meet the UPS load power requirement, i.e. (P) PV +K 2 *P bat )*K 3 ＝P ups +P limit3 ；
Wherein: p (P) PV For the current PV power, P PV ＝V PV *I PV ；
P bat P is the current battery power bat ＝V bat *I bat ；
P ups For the current load power, P ups ＝V ups *I ups ；
K 2 Representing a value for the charge and discharge state of the current battery;
K 3 conversion efficiency for the current hybrid energy storage inverter;
P limit3 a threshold is preset for power comparison.
3. The hybrid energy storage inverter off-grid MPPT control device of claim 1, wherein S4, Δi in S3 ups <At 0, the control section adjusts the battery power according to the current state of the battery module BAT as follows: when the battery module BAT is in a discharging state, the battery power is reduced, and when the battery module BAT is in a charging state, the battery power is increased to ensure that the power of the current photovoltaic panel PV and the battery module BAT can meet the UPS load power requirement, i.e. (P) PV +K 2 *P bat )*K 3 ＝P ups +P limit3 ；
Wherein: p (P) PV For the current PV power, P PV ＝V PV *I PV ；
P bat P is the current battery power bat ＝V bat *I bat ；
P ups For the current load power, P ups ＝V ups *I ups ；
K 2 Representing a value for the charge and discharge state of the current battery;
K 3 conversion efficiency for the current hybrid energy storage inverter;
P limit3 a threshold is preset for power comparison.
4. The hybrid energy storage inverter off-grid MPPT control device of claim 1, wherein the preset parameter value Δv, different types of photovoltaic panels PV, Δv = 1-10V; the preset parameter value I limit Hybrid energy storage inverters of different types, I limit ＝1～5A；
The preset parameter value K1 is set according to V when different types of photovoltaic panels PV and UPS loads are cut in PV Debug determination, K 1 ＝-10～10；
The preset parameter value P limit1 Different types of photovoltaic panels PV, P thereof limit1 ＝0～500W；
The preset parameter value P limit2 Different types of photovoltaic panels PV, P thereof limit2 ＝10～500W。
5. The off-grid MPPT control method of the hybrid energy storage inverter comprises the following steps:
s1, when the hybrid energy storage inverter runs off-grid, MPPT control is suspended, and the PV control voltage V of the disturbance photovoltaic panel is not tracked any more ref Stabilizing the PV output power of the photovoltaic panel; adjusting the voltage of the direct current bus to enable the sampling value of the voltage of the direct current bus to be stabilized within a set range; initializing V ref (0)＝0.8*V open ，V open An open circuit voltage for the photovoltaic panel PV;
s2, disturbance control voltage V with fixed step length ref Once, let V ref(1) ＝V ref(0) +DeltaV, deltaV is a preset parameter value, and V is adjusted PV Make V PV ＝V ref(1) Then based on the charge and discharge state of the battery module BAT and the battery current sampling value I bat Determination of the change in condition V PV Maximum power point voltage V with photovoltaic panel PV mpp Is the relation of:
if the post-disturbance I is the above-mentioned when the battery module BAT is in a charged state bat If the number increases, then determine V PV ＜V mpp Otherwise V PV ＞V mpp The method comprises the steps of carrying out a first treatment on the surface of the When the battery module BAT is in a discharging state, if the post-disturbance I bat If the number increases, then determine V PV ＞V mpp The method comprises the steps of carrying out a first treatment on the surface of the Otherwise V PV ＜V mpp ；
S3, restarting MPPT control, and sampling UPS working current I ups PV operating voltage V PV PV operating current I PV Recording the sampling initial value I of UPS working current ups(0) Will I ups In MPPT control, MPPT tracking is rapidly performed along with UPS load change:
absolute value of UPS working current difference (delta I) between the kth sampling period and the (k-1) th sampling period ups |≤I limit When not disturbing the control voltage V ref ；
Absolute value of UPS working current difference (delta I) between the kth sampling period and the (k-1) th sampling period ups |＞I limit In this case, the current (n+1) th MPPT control period is terminated and the (n+1) th MPPT control period is started in advance, so that the MPPT control period is updated faster, and the (n+1) th MPPT control period is used for the control of V ref(n+1) Performing variable step disturbance: v (V) ref(n+1) ＝V ref(n) +ΔV1；
Wherein:
|ΔI ups |＝|I ups(k) -I ups(k-1) |；
ΔV 1 ＝K 1 *|ΔI ups |；
k. n is an integer more than or equal to 1;
I limit the UPS load change judging method is used for judging whether the UPS load change is overlarge when the network is disconnected or not according to preset parameter values;
K 1 to preset parameter value, K 1 The positive and negative laws of (2) are as follows:
when DeltaI ups At > 0, the UPS load power increases after off-grid: if V is determined in the above S2 PV ＜V mpp Then V needs to be increased ref(n+1) ，K 1 Taking a positive value; if V is determined in the above S2 PV ＞V mpp Then V needs to be reduced ref(n+1) ，K 1 Taking a negative value;
when DeltaI ups <At 0, the UPS load power is reduced after off-grid: if V is determined in the above S2 PV ＜V mpp Then V needs to be reduced ref(n+1) ，K 1 Taking a negative value; if it is determined in S2 that: v (V) PV ＞V mpp Then V needs to be increased ref(n+1) ，K 1 Taking a positive value;
s4, stopping the variable step disturbance control voltage V ref(n+1) And (3) adjusting battery power judgment:
when DeltaI in S3 is as above ups At > 0, V for the (n+1) th MPPT control period ref(n+1) After step-variable disturbance, V is adjusted PV(n+1) ＝V ref(n+1) If at this time the power of the photovoltaic panel PV varies Δp=p PV(n+1) -P PV(n) < Pre-treatmentSetting a parameter value P limit1 Then the photovoltaic panel PV is operated near the maximum power point, the UPS load power is overlarge, and the disturbance control voltage V is stopped ref And adjusts battery power according to the current state of the battery module BAT; if at this time the power of the photovoltaic panel PV varies Δp=p PV(n+1) -P PV(n) ≥P limit1 Ending the current MPPT control period, and returning to the step S3;
when DeltaI in S3 is as above ups <0, V for the (n+1) th MPPT control period ref(n+1) After step-variable disturbance, V is adjusted PV(n+1) ＝V ref(n+1) : if at this time the power P of the photovoltaic panel PV PV(n+1) < preset parameter value P limit2 Then the photovoltaic panel PV is basically operated at the open circuit voltage or the vicinity of the lowest voltage of the system, the UPS load power is smaller, and the disturbance control voltage V is stopped ref And adjusts battery power according to the current state of the battery module BAT; if at this time the power P of the photovoltaic panel PV PV(n+1) ≥P limit2 Ending the current MPPT control period, and returning to the step S3;
wherein: p (P) PV(n+1) ＝V PV(n+1) *I PV(n+1) ；P PV(n) ＝V PV(n) *I PV(n) 。
6. The hybrid energy storage inverter off-grid MPPT control method of claim 5, wherein S4, Δi as in S3 ups At > 0, the battery power is adjusted according to the current state of the battery module BAT as follows: when the battery module BAT is in a discharging state, the battery power is increased, and when the battery module BAT is in a charging state, the battery power is reduced to ensure that the current photovoltaic panel PV and the battery module BAT power can meet the UPS load power requirement, i.e. (P) PV +K 2 *P bat )*K 3 ＝P ups +P limit3 ；
Wherein:
P PV for the current PV power, P PV ＝V PV *I PV ；
P bat P is the current battery power bat ＝V bat *I bat ；
P ups For the current load power, P ups ＝V ups *I ups ；
K 2 Representing a value for the charge and discharge state of the current battery;
K 3 conversion efficiency for the current hybrid energy storage inverter;
P limit3 a threshold is preset for power comparison.
7. The hybrid energy storage inverter off-grid MPPT control method of claim 5, wherein S4, Δi as in S3 ups <0, the battery power is adjusted according to the current state of the battery module BAT as follows: when the battery module BAT is in a discharging state, the battery power is reduced, and when the battery module BAT is in a charging state, the battery power is increased to ensure that the power of the current photovoltaic panel PV and the battery module BAT can meet the UPS load power requirement, i.e. (P) PV +K 2 *P bat )*K 3 ＝P ups +P limit3 ；
Wherein:
P PV for the current PV power, P pv ＝V pv *I pv ；
P bat P is the current battery power bat ＝V bat *I bat ；
P ups For the current load power, P ups ＝V ups *I ups ；
K 2 Representing a value for the charge and discharge state of the current battery;
K 3 conversion efficiency for the current hybrid energy storage inverter;
P limit3 a threshold is preset for power comparison.
8. The hybrid energy storage inverter off-grid MPPT control method of claim 5, wherein said preset parameter value Δv, different types of photovoltaic panels PV, Δv = 1-10V;
the preset parameter value I limit Of different typesHybrid energy storage inverter, I limit ＝1～5A；
The preset parameter value K1 is set according to V when different types of photovoltaic panels PV and UPS loads are cut in PV Debug determination, K 1 ＝-10～10；
The preset parameter value P limit1 Different types of photovoltaic panels PV, P thereof limit1 ＝0～500W；
The preset parameter value P limit2 Different types of photovoltaic panels PV, P thereof limit2 ＝10～500W。
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