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CN115173390B - A photovoltaic energy storage coordinated DC bus voltage stabilization unit, DC bus voltage stabilization control method and power quality regulator - Google Patents

A photovoltaic energy storage coordinated DC bus voltage stabilization unit, DC bus voltage stabilization control method and power quality regulator Download PDF

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Publication number
CN115173390B
CN115173390B CN202210837434.1A CN202210837434A CN115173390B CN 115173390 B CN115173390 B CN 115173390B CN 202210837434 A CN202210837434 A CN 202210837434A CN 115173390 B CN115173390 B CN 115173390B
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voltage
module
current
transformer
power supply
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CN115173390A (en
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赵中伟
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Zhejiang Gongshang University
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Zhejiang Gongshang University
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00Circuit arrangements for DC mains or DC distribution networks
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00Circuit arrangements for DC mains or DC distribution networks
    • H02J1/02Arrangements for reducing harmonics or ripples
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007Regulation of charging or discharging current or voltage
    • H02J7/00712Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
    • H02J7/345Parallel operation in networks using both storage and other DC sources, e.g. providing buffering using capacitors as storage or buffering devices
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
    • H02J7/35Parallel operation in networks using both storage and other DC sources, e.g. providing buffering with light sensitive cells
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/50Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a light-storage cooperative direct-current bus voltage stabilizing unit, a direct-current bus voltage stabilizing control method and an electric energy quality regulator, which comprise a PV photovoltaic array and a lithium battery pack; a Boost boosting module is connected between the PV photovoltaic array and the lithium battery pack; the two ends of the Boost module are respectively provided with a voltage and current acquisition module, and an energy control module is further connected between the two voltage and current acquisition modules; the energy control module is also connected to the Boost module through the driving module; according to the invention, through the PV photovoltaic array and the lithium battery pack, the continuous charging of the PV photovoltaic array is utilized to ensure the effective output of the power of the lithium battery pack, so that the problem of unstable direct current bus caused by the sag of an alternating current power supply during the current harmonic compensation can be effectively reduced, and the effectiveness and stability of the current harmonic treatment are greatly improved; and the output voltage of the Boost module is compensated through the energy control module, so that the constant voltage output by the Boost module is ensured, and the voltage stabilizing control of the direct current bus is realized.

Description

Light-storage cooperative direct-current bus voltage stabilizing unit, direct-current bus voltage stabilizing control method and electric energy quality regulator
Technical Field
The invention relates to the technical field of electric energy regulation, in particular to an optical storage cooperative direct current bus voltage stabilizing unit, a direct current bus voltage stabilizing control method and an electric energy quality regulator.
Background
The micro-grid integrating load, power supply and regulation means is one of the most important new energy grid forms except the main grid of the novel power system. Among renewable energy sources connected to a micro-grid, photovoltaic power generation and wind power generation are the fastest growing. From the aspect of electric energy quality, compared with a traditional power distribution network, the electric energy quality problem of the power distribution network containing the micro-grid is easy to generate due to the complexity and uncertainty of a distributed power supply. At present, under the condition of insufficient power grid acceptance, along with the access of large-scale or high-power distributed renewable energy sources, the electric energy quality of the existing power distribution network is affected. Because renewable energy sources such as photovoltaic, wind energy and the like are easy to influence by weather, voltage fluctuation is easy to cause, and grid-connected voltage random fluctuation is large and adjustability is poor. In addition, larger impact current can be generated when the micro-grid is connected, so that the frequency of the power grid is deviated, voltage fluctuation and flicker of the power grid can be caused, power flow in a feeder line is changed, steady-state voltage distribution and reactive power characteristics are affected, uncontrollability and peak shaving capacity redundancy of the power grid are increased, and meanwhile, three-phase unbalance of the power distribution network is increased due to the fact that a large number of single-phase distributed power sources exist in the micro-grid.
The electric energy quality management technology which is widely used at home and abroad and applied to the traditional distribution network mainly comprises (1) a dynamic reactive power compensation technology such as a Static Var Compensator (SVC), (2) an active power filtering technology such as an Active Power Filter (APF) and (3) a dynamic voltage recovery technology such as a Dynamic Voltage Restorer (DVR). SVC can solve the problems of voltage drop, unbalanced three phases and the like caused by insufficient reactive power of the system, APF can solve the problems of current harmonic waves, unbalanced three phases and the like, and DVR can solve the problems of voltage sag, voltage harmonic waves and the like. At present, most of electric energy management equipment usually focuses on a specific index, and under the condition that a power distribution network is stable, the electric energy management requirements can be basically met. However, for power quality management of a distribution network containing micro-grids, it has been difficult to meet the requirements in a loose combination of single or multiple power quality management devices.
Based on the above situation, the invention provides an optical storage cooperative direct current bus voltage stabilizing unit, a direct current bus voltage stabilizing control method and an electric energy quality regulator, which can effectively solve the problems.
Disclosure of Invention
The invention aims to provide an optical storage cooperative direct current bus voltage stabilizing unit, a direct current bus voltage stabilizing control method and an electric energy quality regulator.
The invention is realized by the following technical scheme:
The photovoltaic storage cooperative direct current bus voltage stabilizing unit comprises a photovoltaic array and a lithium battery pack, wherein a Boost module is connected between the photovoltaic array and the lithium battery pack, voltage and current acquisition modules are arranged at two ends of the Boost module, an energy control module is further connected between the two voltage and current acquisition modules, and the energy control module is further connected to the Boost module through a driving module.
Preferably, the Boost module comprises a transformer T, one side of the transformer T is connected with a low-voltage circuit, and the other side of the transformer T is connected with a high-voltage circuit.
Preferably, the low-voltage circuit includes a low-voltage power supply U l, the positive electrode of the low-voltage power supply U l is connected to the input end of the primary side of the transformer T through a first inductor L i and a boost leakage inductance L s, the output end of the primary side of the transformer T is connected to the negative electrode of the low-voltage power supply U l through a second capacitor C 2, one end of the first inductor L i is connected to one end of the second capacitor C 2 through a first MOS tube V T1 and a first capacitor C 1, the same end of the first inductor L i is connected to the other end of the second capacitor C 2 through a second MOS tube V T2, a first diode V D1 and a first filter capacitor C r1 are connected in parallel to the first MOS tube V T1, and a second diode V D2 and a second filter capacitor C r2 are connected in parallel to the second MOS tube V T2.
Preferably, the high-voltage circuit comprises a high-voltage power supply U h, the positive electrode of the high-voltage power supply U h is connected to the input end of the secondary side of the transformer T through a third MOS tube V T3, the negative electrode of the high-voltage power supply U h is connected to the output end of the secondary side of the transformer T through a fourth capacitor C 4, the positive electrode of the high-voltage power supply U h is also connected to the output end of the secondary side of the transformer T through a third capacitor C 3, the negative electrode of the high-voltage power supply U h is also connected to the input end of the secondary side of the transformer T through a fourth MOS tube V T4, a rectifying capacitor C o is connected in parallel to the high-voltage power supply U h, a third diode V D3 and a third filter capacitor C r3 are connected in parallel to the third MOS tube V T3, and a fourth diode V D4 and a fourth filter capacitor C r4 are connected in parallel to the fourth MOS tube V T4.
Preferably, the energy control module comprises an operational amplifier, an analog linear isolation chip, an A/D conversion chip, a DSP chip and a D/A conversion chip, wherein the DSP chip is also connected with an SRAM memory.
A voltage stabilizing control method for a direct current bus comprises the following steps:
photovoltaic power generation, namely absorbing energy released by illumination through a PV photovoltaic array and converting the energy into direct-current electric energy;
Charging the lithium battery pack, namely, increasing output voltage to charge the lithium battery pack through a Boost module connected to the output end of the PV photovoltaic array;
Collecting voltage and current, namely collecting current and voltage at two ends of the Boost module through a voltage and current collecting module connected with the two ends of the Boost module, and transmitting the collected current and voltage to an energy control module;
and electric energy distribution, namely carrying out voltage compensation on the Boost module by utilizing a constant voltage control algorithm by means of a power supply circuit and a peripheral circuit through voltage and current acquired by the voltage and current acquisition module in real time.
Preferably, when the lithium battery pack is charged, one side of the transformer in the Boost module is a low voltage side, the other side is a high voltage side, the low voltage side transmits power P 0 to the high voltage side, expressed as formula (1),
Wherein U 1 is the low-side input voltage, ω is the switching angular frequency, L s is the boost transformer leakage inductance, θ is the phase difference between the half-bridge conduction angles in the low-side and high-side.
Preferably, in the electric energy distribution, a GPC algorithm is selected to realize an MPPT function, a controlled autoregressive integral sliding average model is added into the GPC algorithm to serve as a prediction model, and recognized model parameters and information are provided for the GPC algorithm in real time, so that a triangular carrier wave is triggered to enable a driving module to output maximum power.
Preferably, the electric energy distribution further comprises the following steps:
The stably output voltage is controlled by a double-loop control strategy of a voltage outer loop and a current inner loop to obtain a transfer function shown in a formula (2),
Wherein K dcl is the integration constant of the dc bus voltage PI regulator.
The power quality regulator comprises a serial active filter, a parallel active filter and the light storage cooperative direct current bus voltage stabilizing unit.
Compared with the prior art, the invention has the following advantages:
the photovoltaic storage cooperative direct current bus voltage stabilizing unit, the direct current bus voltage stabilizing control method and the electric energy quality regulator ensure effective output of power of the lithium battery pack through the PV photovoltaic array and the lithium battery pack by utilizing continuous charging of the PV photovoltaic array, can effectively reduce the problem of unstable direct current buses caused by sag of an alternating current power supply during current harmonic compensation, greatly improve the effectiveness and stability of current harmonic treatment, provide a direct current power supply through the PV photovoltaic array, improve the voltage of the direct current power supply output by the PV photovoltaic array through the Boost module, ensure that charging voltage of the lithium battery pack is achieved, provide stable voltage for charging of a direct current capacitor through the lithium battery pack, and further ensure stable compensation voltage of the direct current bus capacitor through the energy control module, compensate the output voltage of the Boost module according to data acquired at two ends of the Boost module, ensure that the voltage output by the Boost module is constant at a set value, and realize stable voltage control of the direct current bus.
Drawings
FIG. 1 is a schematic structural diagram of embodiment 1 of the present invention;
FIG. 2 is a circuit diagram of a Boost module according to the present invention;
FIG. 3 is a hardware block diagram of an energy control module according to the present invention;
FIG. 4 is a logic diagram of the constant voltage control of the DC bus in embodiment 2 of the present invention;
FIG. 5 is a graph showing the constant voltage control transfer function of the DC bus in example 2 of the present invention;
Fig. 6 is a schematic structural diagram of embodiment 3 of the present invention.
Detailed Description
In order that those skilled in the art will better understand the technical solution of the present invention, a preferred embodiment of the present invention will be described below with reference to specific examples, but it should be understood that the drawings are only for illustrating and not to be construed as limiting the present patent, that for better illustrating the examples, certain components of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product, and that certain well-known structures in the drawings and descriptions thereof may be omitted to those skilled in the art. The positional relationship depicted in the drawings is for illustrative purposes only and is not to be construed as limiting the present patent.
Example 1:
The photovoltaic storage cooperative direct current bus voltage stabilizing unit comprises a photovoltaic array and a lithium battery pack, wherein a Boost boosting module is connected between the photovoltaic array and the lithium battery pack, voltage and current collecting modules are arranged at two ends of the Boost boosting module, an energy control module is connected between the two voltage and current collecting modules, and the energy control module is connected to the Boost boosting module through a driving module.
The invention ensures the effective output of the power of the lithium battery pack by utilizing the continuous charging of the PV photovoltaic array and the lithium battery pack, can effectively reduce the problem of unstable direct current bus caused by the sag of an alternating current power supply when current harmonic compensation is carried out, greatly improves the effectiveness and stability of current harmonic treatment, provides a direct current power supply by the PV photovoltaic array, improves the voltage of the direct current power supply output by the PV photovoltaic array at a Boost module, ensures the charging voltage of the lithium battery pack, provides stable voltage for charging a direct current capacitor by the lithium battery pack, thereby ensuring the stable compensation voltage of the direct current bus capacitor, and compensates the output voltage of the Boost module according to the data acquired at two ends of the Boost module by an energy control module, ensures the constant voltage output by the Boost module at a set value and realizes the stable voltage control of the direct current bus.
Further, in another embodiment, the Boost module includes a transformer T, one side of the transformer T is connected with a low voltage circuit, and the other side of the transformer T is connected with a high voltage circuit.
The voltage is raised or lowered by the transformer T.
Further, in another embodiment, the low-voltage circuit includes a low-voltage power supply U l, the positive electrode of the low-voltage power supply U l is connected to the input end of the primary side of the transformer T through a first inductor L i and a boost leakage inductance L s, the output end of the primary side of the transformer T is connected to the negative electrode of the low-voltage power supply U l through a second capacitor C 2, one end of the first inductor L i is connected to one end of the second capacitor C 2 through a first MOS tube V T1 and a first capacitor C 1, the same end of the first inductor L i is connected to the other end of the second capacitor C 2 through a second MOS tube V T2, a first diode V D1 and a first filter capacitor C r1 are connected in parallel to the first MOS tube V T1, and a second diode V D2 and a second filter capacitor C r2 are connected in parallel to the second MOS tube V T2.
The fluctuating voltage is filtered through the first filter capacitor C r1 and the second filter capacitor C r2, so that the voltage difference to be transformed is smaller, and the voltage output by the Boost module is stable.
Further, in another embodiment, the high-voltage circuit includes a high-voltage power supply U h, an anode of the high-voltage power supply U h is connected to an input end of a secondary side of the transformer T through a third MOS tube V T3, a cathode of the high-voltage power supply U h is connected to an output end of the secondary side of the transformer T through a fourth capacitor C 4, an anode of the high-voltage power supply U h is also connected to an output end of the secondary side of the transformer T through a third capacitor C 3, a cathode of the high-voltage power supply U h is also connected to an input end of the secondary side of the transformer T through a fourth MOS tube V T4, a rectifying capacitor C o is connected in parallel to the high-voltage power supply U h, a third diode V D3 and a third filter capacitor C r3 are connected in parallel to the third MOS tube V T3, and a fourth diode V D4 and a fourth filter capacitor C r4 are connected in parallel to the fourth MOS tube V T4.
And the fluctuating voltage is filtered through the third filter capacitor C r3 and the fourth filter capacitor C r4, so that the fluctuation amplitude of the boosted voltage is reduced, and the voltage output by the Boost module is ensured to be stable.
Further, in another embodiment, the energy control module includes an operational amplifier, an analog linear isolation chip, an a/D conversion chip, a DSP chip, and a D/a conversion chip, where the DSP chip is further connected to the SRAM memory.
The model of the operational amplifier is LM358, and the model of the DSP chip is TMS320C2802.
Example 2:
as shown in fig. 1 to 5, a voltage stabilizing control method for a direct current bus includes the following steps:
photovoltaic power generation, namely absorbing energy released by illumination through a PV photovoltaic array and converting the energy into direct-current electric energy;
Charging the lithium battery pack, namely, increasing output voltage to charge the lithium battery pack through a Boost module connected to the output end of the PV photovoltaic array;
Collecting voltage and current, namely collecting current and voltage at two ends of the Boost module through a voltage and current collecting module connected with the two ends of the Boost module, and transmitting the collected current and voltage to an energy control module;
and electric energy distribution, namely carrying out voltage compensation on the Boost module by utilizing a constant voltage control algorithm by means of a power supply circuit and a peripheral circuit through voltage and current acquired by the voltage and current acquisition module in real time.
The voltage and current at two ends of the Boost module are collected, the power is calculated, then the Boost module is subjected to voltage compensation by means of a power circuit and a peripheral circuit through analysis of the energy control module, the voltage value output by the Boost module is ensured to be stabilized at a set value of the voltage, and the voltage stabilizing control of the direct current bus is realized.
Further, in another embodiment, when the lithium battery pack is charged, one side of the transformer in the Boost module is a low voltage side, the other side is a high voltage side, the low voltage side transmits power P 0 to the high voltage side, expressed as formula (1),
Wherein U 1 is the low-side input voltage, ω is the switching angular frequency, L s is the boost transformer leakage inductance, θ is the phase difference between the half-bridge conduction angles in the low-side and high-side.
The Boost module can utilize the high transformation ratio to establish the direct-current side high voltage of the lithium battery pack, and simultaneously adjust the phase difference between the half-bridge conduction angles in the low-voltage side and the high-voltage side, and when the output of the PV photovoltaic array fluctuates, active power is exchanged between the lithium battery pack and the photovoltaic panel battery in a bidirectional way.
Further, in another embodiment, in the electric energy distribution, a GPC algorithm is selected to implement the MPPT function, and a controlled autoregressive integral moving average model is added to the GPC algorithm as a prediction model, so that the identified model parameters and information are provided to the GPC algorithm in real time, and the triangular carrier is triggered to enable the driving module to output the maximum power.
In a Boost module, according to the voltage and current output by a PV photovoltaic array, an MPPT control logic is realized by adopting the P-GPC control algorithm, a reference voltage value of a photovoltaic cell working point is set, an error value is generated compared with the actual output voltage of the photovoltaic cell, the comparison is carried out between the reference voltage value and a high-frequency triangular carrier after the adjustment of the P-GPC algorithm, S is turned on, and otherwise S is turned off, so that the voltage of the photovoltaic array stably works, the output power of the photovoltaic array is controlled to reach the maximum value by adopting the P-GPC algorithm, and the advantages of predictive control and adaptive control are fused by the P-GPC, thereby realizing the optimal control of the MPPT.
Further, in another embodiment, the power distribution further includes the following:
The stably output voltage is controlled by a double-loop control strategy of a voltage outer loop and a current inner loop to obtain a transfer function shown in a formula (2),
Wherein K dcl is the integration constant of the dc bus voltage PI regulator.
As shown in fig. 4, a voltage outer loop and a current inner loop are adopted, the output direct current voltage is ensured to be stabilized at a voltage U dc through voltage PI outer loop control, a direct current bus reference voltage U dcref=Udc is obtained after Boost of a Boost circuit is obtained by U dcref, an output current after Boost is obtained by I dc, the voltage outer loop is formed by U dcref and U dc, a direct current voltage PI control loop is formed, a generated current I dR current I dc sequentially passes through an inner loop PI controller, and a PWM signal is generated and an IGBT driver generates a direct current bus voltage U dc.
For the direct current bus voltage PI regulator, the current loop is approximately replaced by a first-order inertia link as shown in the formula (3):
T v is the equivalent inertial time constant, and the transfer function of the DC bus voltage control is shown in FIG. 5.
In fig. 5, τ dc is a sampling delay time constant of a dc bus voltage, K dcp is a proportionality constant of a dc bus voltage PI regulator, K dcl is an integral constant of the dc bus voltage PI regulator, and an open loop forward transfer function of the control system is as shown in formula (4):
Since τ dc,Tv is small in the formula (2), τ dc=0.000Is,Tv =0.0005 s.
According to the principle of merging small inertia links, the formula (4) is simplified into the formula (5):
Setting K pwm =2 in the formula (5), and letting K dcP/Kdcl=Tpwm realize pole-zero cancellation, then obtaining the formula (2):
Example 3:
As shown in fig. 6, an electric energy quality regulator includes a series active filter, a parallel active filter, and the above-mentioned optical storage cooperative dc bus voltage stabilizing unit.
The light storage cooperative direct current bus voltage stabilizing control unit is added to control the voltage at two ends of the direct current bus voltage stabilizing capacitor, so that a good voltage stabilizing control effect is ensured.
Based on the description of the invention and the accompanying drawings, those skilled in the art can easily manufacture or use the light-storage cooperative direct-current bus voltage stabilizing unit, the direct-current bus voltage stabilizing control method and the power quality regulator of the invention, and can produce the positive effects described in the invention.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent variation, etc. of the above embodiment according to the technical matter of the present invention fall within the scope of the present invention.

Claims (7)

1. The photovoltaic storage cooperative direct current bus voltage stabilizing unit is characterized by comprising a PV photovoltaic array and a lithium battery pack, wherein a Boost module is connected between the PV photovoltaic array and the lithium battery pack, voltage and current acquisition modules are arranged at two ends of the Boost module, and an energy control module is also connected between the two voltage and current acquisition modules, and the energy control module is also connected to the Boost module through a driving module;
The Boost module comprises a transformer T, one side of the transformer T is connected with a low-voltage circuit, and the other side of the transformer T is connected with a high-voltage circuit;
The low-voltage circuit comprises a low-voltage power supply U l, wherein the positive electrode of the low-voltage power supply U l is connected to the input end of the primary side of a transformer T through a first inductor L i and a boost leakage inductance L s, the output end of the primary side of the transformer T is connected to the negative electrode of the low-voltage power supply U l through a second capacitor C 2, one end of the first inductor L i is connected to one end of a second capacitor C 2 through a first MOS tube V T1 and a first capacitor C 1, the same end of the first inductor L i is connected to the other end of a second capacitor C 2 through a second MOS tube V T2, a first diode V D1 and a first filter capacitor C r1 which are connected in parallel are connected to the first MOS tube V T1 in parallel, and a second diode V D2 and a second filter capacitor C r2 which are connected to the second MOS tube V T2 in parallel;
The high-voltage circuit comprises a high-voltage power supply U h, the positive electrode of the high-voltage power supply U h is connected to the input end of the secondary side of the transformer T through a third MOS tube V T3, the negative electrode of the high-voltage power supply U h is connected to the output end of the secondary side of the transformer T through a fourth capacitor C 4, the positive electrode of the high-voltage power supply U h is also connected to the output end of the secondary side of the transformer T through a third capacitor C 3, the negative electrode of the high-voltage power supply U h is also connected to the input end of the secondary side of the transformer T through a fourth MOS tube V T4, a rectifying capacitor C o is connected to the high-voltage power supply U h in parallel, a third diode V D3 and a third filtering capacitor C r3 which are connected to the third MOS tube V T3 in parallel are connected to the fourth diode V D4 and the fourth filtering capacitor C r4 which are connected to the fourth MOS tube V T4 in parallel.
2. The light-storage cooperative direct-current bus voltage stabilizing unit according to claim 1, wherein the energy control module comprises an operational amplifier, an analog linear isolation chip, an A/D conversion chip, a DSP chip and a D/A conversion chip, and the DSP chip is further connected with an SRAM.
3. The direct current bus voltage stabilizing control method is characterized by being applied to the light storage cooperative direct current bus voltage stabilizing unit in claim 1 or 2, and comprises the following contents:
photovoltaic power generation, namely absorbing energy released by illumination through a PV photovoltaic array and converting the energy into direct-current electric energy;
Charging the lithium battery pack, namely, increasing output voltage to charge the lithium battery pack through a Boost module connected to the output end of the PV photovoltaic array;
Collecting voltage and current, namely collecting current and voltage at two ends of the Boost module through a voltage and current collecting module connected with the two ends of the Boost module, and transmitting the collected current and voltage to an energy control module;
and electric energy distribution, namely carrying out voltage compensation on the Boost module by utilizing a constant voltage control algorithm by means of a power supply circuit and a peripheral circuit through voltage and current acquired by the voltage and current acquisition module in real time.
4. The method for controlling voltage regulation of a DC bus as set forth in claim 3, wherein, when the lithium battery pack is charged, one side of the transformer in the Boost module is a low voltage side, the other side is a high voltage side, the low voltage side transmits power P 0 to the high voltage side, expressed as formula (1),
Wherein U 1 is the low-side input voltage, ω is the switching angular frequency, L s is the boost transformer leakage inductance, θ is the phase difference between the half-bridge conduction angles in the low-side and high-side.
5. The method for controlling voltage stabilization of direct current bus according to claim 3, wherein in the electric energy distribution, GPC algorithm is selected to realize MPPT function, and a controlled autoregressive integral sliding average model is added in the GPC algorithm as a prediction model, and identified model parameters and information are provided to the GPC algorithm in real time, so that triangular carrier wave is triggered to enable the driving module to output maximum power.
6. The method for controlling the voltage stabilization of a direct current bus according to claim 3, wherein the electric energy distribution further comprises the following steps:
The stably output voltage is controlled by a double-loop control strategy of a voltage outer loop and a current inner loop to obtain a transfer function shown in a formula (2),
Wherein K dcl is the integration constant of the dc bus voltage PI regulator.
7. An electric energy quality regulator is characterized by comprising a serial active filter, a parallel active filter and the light storage cooperative direct current bus voltage stabilizing unit according to claim 1 or 2.
CN202210837434.1A 2022-07-15 2022-07-15 A photovoltaic energy storage coordinated DC bus voltage stabilization unit, DC bus voltage stabilization control method and power quality regulator Active CN115173390B (en)

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