CN112436551B - Ship power supply system - Google Patents

Ship power supply system Download PDF

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Publication number
CN112436551B
CN112436551B CN202011290449.8A CN202011290449A CN112436551B CN 112436551 B CN112436551 B CN 112436551B CN 202011290449 A CN202011290449 A CN 202011290449A CN 112436551 B CN112436551 B CN 112436551B
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capacitor
current
phase inverter
inverter circuit
inductor
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CN112436551A (en
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方玉攀
甘世红
邱宾宾
陈亮
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Shanghai Maritime University
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Shanghai Maritime University
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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
    • 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
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • 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
    • H02J9/08—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 requiring starting of a prime-mover
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
    • 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
    • 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
    • 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
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Inverter Devices (AREA)

Abstract

The invention provides a ship power supply system, which comprises a power grid power supply device, a generator and a motor, wherein the generator comprises: the power grid supply device comprises: a main distribution board; a main switch; a main power distribution switch; a solar panel; an inverter; the solar panel is connected with the inverter through the main switch, the inverter is connected with one end of the main distribution board, the other end of the main distribution board is connected with one end of the main distribution switch, and the other end of the main distribution board is connected with the shore power SC; the generator is connected to the motor through the main panel.

Description

Ship power supply system
Technical Field
The invention relates to the technical field of ship power supply, in particular to a ship power supply system.
Background
With the development of shipping industry, the requirements of world maritime organizations on ship energy conservation and emission reduction are higher and higher. The current ship power utilization is mainly a generator or an axle generator, and in order to achieve the purposes of energy conservation and emission reduction, the photovoltaic power generation of the ship becomes one of important ways for improving the energy structure of the ship. Photovoltaic power generation systems are widely applied to land, and the core technology of the photovoltaic power generation systems is mastered. The movement of photovoltaic power generation technology on land to ships has become the subject of research by many researchers. However, on a ship, if only photovoltaic power generation is adopted to supply power to the ship, the photovoltaic power generation is mainly used as an auxiliary energy source in a large ship.
Due to the limited space of the ship, the amount of photovoltaic power generation is greatly limited. In addition, in navigation, the ship is easily influenced by the external weather and sea surface conditions, so that the photovoltaic power generation efficiency is lower, and higher requirements are provided for the selection and control method of the inverter in the photovoltaic power generation. The traditional inverter has the defects of high cost, low inversion efficiency, poor grid connection quality and the like.
Disclosure of Invention
In view of the above disadvantages of the prior art, the present invention aims to provide a ship power supply system, which aims to improve the photovoltaic power generation efficiency and grid connection quality of ships.
To achieve the above and other related objects, the present invention provides a ship power supply system, which includes a power grid supply device, a generator, a motor:
the power grid supply device comprises:
a main distribution board;
a main switch;
a main power distribution switch;
a solar panel;
an inverter;
the solar panel is connected with the inverter through the main switch, the inverter is connected with one end of the main distribution board, the other end of the main distribution board is connected with one end of the main distribution switch, and the other end of the main distribution board is connected with the shore power SC;
the generator is connected to the motor through the main switchboard.
In one implementation, the inverter includes: z source net, three-phase inverter circuit, filter circuit and control circuit
The Z source network, the three-phase inverter circuit and the filter circuit are sequentially connected, and the Z source network, the three-phase inverter circuit and the control circuit are connected.
In one implementation, the Z-source network includes: a first capacitor C 2 A second capacitor C 3 A third capacitor C 1 A first inductor L 1 A second inductor L 2 A first resistor r1, a second resistor r2, a diode D 1 ；
The solar cell panel and the third capacitor C 1 In parallel, the anode of the solar cell panel is connected with the third capacitor C 1 Is connected with the diode D 1 The anode of (2) is connected; the diode D 1 And the first capacitor C 2 Is connected with one end of the first resistor r1, the other end of the first resistor r1 is connected with the first inductor L 1 Is connected with one end of the connecting rod; the first inductor L 1 And the other end of the second capacitor C 3 The first end of the three-phase inverter circuit is connected with the anode of the three-phase inverter circuit; the cathode of the three-phase inverter circuit, one end of the second resistor r2 and the first capacitor C 2 Is connected with the second end of the first end; the other end of the second resistor r2 and the second inductor L 2 Is connected to the second inductor L 2 And the other end of the second capacitor C 3 The second terminal of (C), the third capacitor C 1 Is connected with the second end of the first end; the third capacitor C 1 Is connected to the cathode of the solar panel.
In one implementation mode, the three-phase inverter circuit is divided into a U-phase bridge, a V-phase bridge and a W-phase bridge, and an IGBT and a diode are connected in an anti-parallel mode on the upper portion and the lower portion of each bridge wall.
In one implementation, the filtering circuit is comprised of an LCL filter.
In one implementation, the control circuit includes: direct current side control and alternating current side control;
the direct current side control: collecting Z source network capacitance voltage v C And a reference voltage
Figure GDA0003990769690000021
Comparing to obtain a voltage difference delta v, inputting the voltage difference delta v into an integrator, and inputting the Z source grid inductive current, the Z source grid capacitive voltage and the Z sourceThe value of the net output current and the output value of the integrator are input into a robust state feedback controller; the robust state feedback controller outputs a direct-connection duty ratio D which is sent into the SPWM so as to control a switching device in the three-phase inverter circuit;
the alternating current side control: collecting Z source network capacitance voltage v C And a reference voltage
Figure GDA0003990769690000031
Comparing to obtain a voltage difference Δ v, inputting Δ v into PI regulator, and outputting reference current->
Figure GDA0003990769690000032
Reference current->
Figure GDA0003990769690000033
And through an inductance>
Figure GDA0003990769690000034
Is connected to the grid current->
Figure GDA0003990769690000035
And comparing to obtain a current difference value delta i, inputting the current difference value delta i into a current regulator, outputting a modulation ratio M by the current regulator, and inputting the modulation ratio M into the SPWM to further control a switching device in the three-phase inverter circuit.
Drawings
Fig. 1 is a system block diagram of a photovoltaic power generation system applied to a ship according to an embodiment of the present invention.
Fig. 2 is a general diagram of photovoltaic power generation control provided by the embodiment of the present invention.
FIG. 3 is a diagram of a robust controller according to an embodiment of the present invention.
Fig. 4a and 4b are a non-through equivalent diagram and an equivalent circuit diagram provided by the embodiment of the invention.
Fig. 5 shows a pole arrangement region S (α, ρ, θ) according to an embodiment of the present invention.
Fig. 6 is a current inner loop regulator design provided by an embodiment of the invention.
Fig. 7 is a diagram of a current inner loop control root trace provided by an embodiment of the invention.
Fig. 8 is a design of the capacitor voltage outer loop PI according to an embodiment of the present invention.
Fig. 9 is a diagram of a control root trace of the capacitor voltage outer loop according to an embodiment of the present invention.
Fig. 10 is a flowchart of a control circuit for photovoltaic power generation according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Please refer to fig. 1-10. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
As shown in fig. 1, an embodiment of the present invention provides a ship power supply system, in a conventional ship system, electricity of a ship power grid is mainly provided by three generators. In the invention, photovoltaic power generation is used for replacing one generator to supply power to a power grid. In photovoltaic power generation, the solar panel is used as a main component for power generation and passes through the main switch ACB 1 Connected to the inverter, which is connected to the main switchboard MSB. Two main generators G are arranged below the photovoltaic power generation 1 And G 2 Respectively through main switch ACB 2 、ACB 3 Is connected with the main switchboard MSB. The other side of the main power distribution MSB is sequentially linked from top to bottom into shore power SC, and the shore power SC is connected with the main power distribution MSB through a power distribution switch MCB 1 And (4) connecting. Motor M 1 Between it and main electric board MSB via distribution switch MCB 2 And (4) connecting. Motor M 2 Between it and main electric board MSB via distribution switch MCB 3 And (4) connecting. A distribution board DSB connected with the main board MSB via a distribution switch MCB 4 And (4) connecting. On the right side of the distribution board DSB are connected to various loads via distribution switches. Distribution switch MCB connected with main distribution board MSB 5 The right side of (a) is the pending load. A lighting transformer Tr connected to the main distribution board via a distribution switch MCB 6 Connected, on the right side of the lighting inverter Tr, to the lighting distribution board ISB via a distribution switch MCB 7 The lighting distribution board ISB is connected to the lighting inverter Tr through a distribution switch, and is connected to the lighting distribution board IDSB.
It can be seen from fig. 1 that the power source of the marine power plant is mainly provided by the photovoltaic power generation system and the two generators. The direct current output by the solar panel is inverted into alternating current required by the ship power station through the inverter, and the alternating current is connected with the main distribution panel so as to supply power to the ship power station. When the ship runs in sunny days, the electricity of the ship power station can be completely supplied by the photovoltaic power generation system. Two generators are arranged below the photovoltaic power generation system, and when a ship sails at night or in rainy days or ships load and unload cargos on the shore, one or two generators can be used for supplying power to a ship power station. The photovoltaic power generation system solves the problem of energy shortage and reduces the pollution of ships to the marine environment. The other side of the main switchboard is connected with various loads on the ship through a distribution switch. Wherein the shore power can be connected with the shore power through the shore power box SC, when the ship is in shore, the ship power station can be powered by the shore power, and the ship motor M 1 、M 2 The lighting transformer Tr mainly changes 380V ship power into 220V power and supplies power for 220V rated voltage electric equipment.
On a ship, photovoltaic power generation inverters generally use a lot of voltage-type and current-type inverters, and a Z-source inverter is used as a ship inverter circuit, as shown in fig. 2, a solar panel and a capacitor C 1 In parallel connection, the anode of the solar cell panel and the capacitor C 1 Is connected with the diode D 1 And connecting the anode. Diode D 1 Cathode and capacitor C 2 Is connected with the anode of a resistor r, the cathode of which is connected with an inductor L 1 The anode of (2) is connected; inductor L 1 Cathode and capacitor C 3 The first end of the three-phase inverter circuit is connected with the anode of the three-phase inverter circuit; cathode of three-phase inverter circuit, anode of resistor r and capacitor C 2 Is connected with the second end of the first connector; cathode of resistor r and inductor L 2 Anode connection of (1), inductance L 2 Cathode and capacitor C 3 Second terminal of (1), capacitor C 1 Is connected with the second end of the first end; capacitor C 1 Is connected to the cathode of the solar panel. The three-phase inverter circuit is divided into U, V and W three-phase bridges, and an IGBT and a diode are reversely connected in parallel on the upper part and the lower part of each bridge wall. And the output of the three-phase inverter circuit is filtered by an LCL filter. U-phase bridge and inductor of three-phase inverter circuit
Figure GDA0003990769690000051
Is connected with the anode of (1), the inductance->
Figure GDA0003990769690000052
Cathode and capacitor C U Is connected with the first end of the first connecting pipe; inductor->
Figure GDA0003990769690000053
Anode and inductor>
Figure GDA0003990769690000054
Cathode, capacitor C U Is connected with the first end of the first connecting pipe; inductor->
Figure GDA0003990769690000055
Is connected to the grid. V phase and inductance of three-phase inverter circuit
Figure GDA0003990769690000056
Is connected with the anode of the inductor->
Figure GDA0003990769690000057
Cathode and capacitor C V Is connected with the first end of the first connecting pipe; inductor->
Figure GDA0003990769690000058
Is connected with the inductor>
Figure GDA0003990769690000059
Cathode and capacitor C V Is connected; inductor->
Figure GDA00039907696900000510
Is connected to the grid. W phase and inductor of three-phase inverter circuit>
Figure GDA00039907696900000511
Is connected with the anode of the inductor->
Figure GDA00039907696900000512
Cathode and capacitor C W Is connected with the first end of the first connecting pipe; inductor>
Figure GDA00039907696900000513
Is connected with the inductor>
Figure GDA00039907696900000514
Cathode and capacitor C W Is connected; inductor>
Figure GDA00039907696900000515
Is connected to the grid, a capacitor C U 、C V 、C W Are connected together.
Fig. 2 is a general diagram of photovoltaic power generation control. The whole circuit is divided into a main circuit and a control circuit, the main circuit is composed of a photovoltaic power generation device, a Z source network, a three-phase inverter circuit and a filter circuit, the power generation device is mainly composed of a solar cell panel, the solar cell panel converts light energy into electric energy, and direct current output by the solar cell panel is input into the Z source network. The existence of the Z source network can enable the Z source inverter to realize the functions of voltage boosting and voltage reduction. The three-phase inverter circuit is the core of the Z-source inverter, and direct current is converted into alternating current through the three-phase inverter. At the moment, a large amount of harmonic waves exist in the alternating current, and filtering needs to be carried out through a filter circuit in order to achieve grid connection. The filter circuit mainly filters out harmonic waves to improve the quality of alternating current waveforms.
The control circuit mainly comprises direct current side control and alternating current side control, robust control is adopted on the direct current side, and main capacitor voltage outer loop control and grid-connected current inner loop control are adopted on the alternating current side. And D, direct current side control: collecting Z source network capacitance voltage v C And a reference voltage
Figure GDA0003990769690000061
And comparing to obtain a voltage difference delta v, and inputting the voltage difference delta v into the integrator. i.e. i L 、v C And i 0 Respectively Z source network inductance current, Z source network capacitance voltage and Z source network output current, and the three values together with the output of the integrator are x ext Are input together into a robust state feedback controller. The robust state feedback controller outputs a direct-connection duty ratio D which is sent into the SPWM so as to control a switching device in the three-phase inverter circuit. And (3) alternating current side control: collecting Z source network capacitance voltage v C And a reference voltage->
Figure GDA0003990769690000062
Comparing to obtain a voltage difference Deltav, inputting the Deltav into a PI regulator, and outputting a reference current ^ according to the regulator>
Figure GDA0003990769690000063
Reference current->
Figure GDA0003990769690000064
And through the inductor->
Figure GDA0003990769690000065
In combination current>
Figure GDA0003990769690000066
And comparing to obtain a current difference value delta i, inputting the current difference value delta i into a current regulator, outputting a modulation ratio M by the current regulator, and inputting the modulation ratio M into the SPWM to further control a switching device in the three-phase inverter circuit.
Robust controlDesigning a manufacturing device: the patent mainly adopts a Linear Matrix Inequality (LMI) robust control method, a robust controller graph is shown in figure 3, and w is a load disturbance output current I dis U is the through duty cycle d, K is the robust state feedback controller, x is the state variable, i.e., i L 、v C And i 0 And Z is the output Z source capacitance voltage. Within the box is the whole system equation, i.e.
Figure GDA0003990769690000067
Wherein C z ＝[0 1 0 0]，D zu ＝0，D zw ＝0，w(t)＝I dis (t), u (t) = d. The circuit can be equivalent to fig. 4 by considering the operating states of the inverter under different operating states, and the following parameter matrix is derived by using a state space averaging method (SSA) and small signal model processing:
Figure GDA0003990769690000071
Figure GDA0003990769690000072
in the formula R 0 For an equivalent load, L 0 Is an equivalent inductance, V in Inputting direct current voltage for a Z source network, wherein R is Z source network inductance resistance, and uncertain parameters including direct duty ratio D and load R exist in a control system 0 However, the ranges of both are [ D ] min ,D max ]And [ R ] 0min ,R 0max ]. Wherein A is tot And B u Are influenced by these parameters. The system equation can be written as: />
Figure GDA0003990769690000073
Uncertainty parameter p i ∈[p imin ,p imax ]Can be included in the uncertain vector
Figure GDA0003990769690000074
In, find/answer by polyhedron method>
Figure GDA0003990769690000075
Linearly dependent on >>
Figure GDA0003990769690000076
All acceptable values of. In the whole design process, the following theorem is applied:
linear matrix inequality of quadratic stability (LMI) theorem: if a state feedback controller u = Kx and K = YW is used -1 The system expressed by the equation (1) can be stabilized if and only if the symmetric matrix W and the matrix Y satisfy the inequality
Figure GDA0003990769690000077
H ∞ The linear matrix inequality theorem is controlled: if there is a symmetric positive definite matrix W and matrix Y satisfying inequality (4), with the state feedback controller u = Kx and K = YW -1 The system expressed by the formula (1) can satisfy T zw∞ < gamma, thus ensuring a minimum disturbance interference level.
Figure GDA0003990769690000081
The pole arrangement linear matrix inequality theorem: if there is a symmetric positive definite matrix W and a matrix Y satisfying inequalities (5) - (7), the state feedback controller u = Kx and K = YW -1 The system closed-loop pole represented by equation (1) can be located in the region S (α, ρ, θ) in the pole allocation region of fig. 5.
Figure GDA0003990769690000082
Figure GDA0003990769690000083
Figure GDA0003990769690000084
And solves for the robust state feedback controller K by means of Matlab. Suppose K = [ K = 2 k 2 k 3 k 4 ]Then, the through duty ratio d (t) = k 1 i L +k 2 v C +k 3 i 0 +k 4 x ext 。
Designing an inner ring regulator: fig. 6 shows a current inner loop regulator design, where the regulator is PI control, and a regulator function, a control delay function, an inverter function, a filter function, and a sampling function are respectively substituted into fig. 6, an open-loop transfer function is derived, a closed-loop characteristic equation is further calculated, and a value of the regulator is determined by using a root-locus drawing method, such as a current inner loop control root-locus diagram shown in fig. 7.
Designing an outer ring PI: FIG. 8 design of capacitor voltage outer loop PI, G crt closed loop For the closed-loop transfer function of the current inner-loop control, G crt closed loop And the sampling function is respectively brought into the graph 8, an open-loop transfer function can be deduced, a closed-loop characteristic equation is further calculated, and the value of the PI is determined by using a root trace drawing method. The capacitor voltage outer loop control root trace diagram is shown in fig. 9.
Fig. 10 is a flow chart of a control circuit for photovoltaic power generation. It can be seen from the figure that the whole system control is the control of the direct duty ratio D and the modulation ratio M, and the control is started by firstly acquiring the value v of the capacitance voltage of the Z source grid C V is to be C And reference capacitor voltage
Figure GDA0003990769690000085
The purpose of comparing and collecting the capacitance voltage of the Z source network is to ensure the value v C And the stability of the direct-current bus voltage is indirectly controlled, so that the stability of the direct-current bus voltage is not influenced when the load changes or the power supply is disturbed. Inputting the compared difference value deltav into an integral regulator, and regulating the output x ext The calculation process is performed as->
Figure GDA0003990769690000091
x ext Together with the detected Z-source grid inductor current i L Z source network capacitance voltage v C And Z source net output current i 0 Input together to the robust state feedback controller K, K is a 1 × 4 matrix, assuming K = [ K ] 2 k 2 k 3 k 4 ]D (t) = k through calculation of a robust state feedback device 1 i L +k 2 v C +k 3 i 0 +k 4 x ext . And sending the direct-connection duty ratio D into the SPWM to further control a switching device in the three-phase inverter circuit. Meanwhile, the differential pressure delta v is input into a PI regulator, and a grid-connected current reference value is output through the regulation of the regulator PI
Figure GDA0003990769690000092
Will reference the value->
Figure GDA0003990769690000093
Simultaneously measured grid-connected current->
Figure GDA0003990769690000094
And comparing to obtain a difference value delta i of grid-connected current, inputting the delta i into a regulator, outputting a modulation ratio M after regulation, and finally sending the M into the SPWM to control a switching device in the three-phase inverter circuit.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Those skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (2)

1. A ship power supply system is characterized by comprising a power grid power supply device, a generator and a motor;
the power grid supply device comprises:
a main distribution board;
a main switch;
a main power distribution switch;
a solar panel;
an inverter;
the solar panel is connected with the inverter through the main switch, the inverter is connected with one end of the main distribution board, the other end of the main distribution board is connected with one end of the main distribution switch, and the other end of the main distribution board is connected with the shore power SC;
the generator is connected with the motor through the main distribution board;
the inverter includes: the system comprises a Z source network, a three-phase inverter circuit, a filter circuit and a control circuit;
the Z source network, the three-phase inverter circuit and the filter circuit are sequentially connected, and the Z source network, the three-phase inverter circuit and the control circuit are connected;
the three-phase inverter circuit is divided into U, V and W three-phase bridges, and an IGBT and a diode are reversely connected in parallel on the upper part and the lower part of each bridge wall;
the filter circuit consists of an LCL filter;
the control circuit includes: direct current side control and alternating current side control;
the direct current side control: collecting Z source network capacitance voltage v C And a reference voltage
Figure FDA0003990769680000011
Comparing to obtain a voltage difference delta v, inputting the voltage difference delta v into an integrator, and inputting the values of the Z source grid inductance current, the Z source grid capacitance voltage and the Z source grid output current and the output value of the integrator into a robust state feedback controller; the robust state feedback controller outputs a direct-connection duty ratio D which is sent into the SPWM so as to control a switching device in the three-phase inverter circuit;
the alternating current side control: collecting Z source network capacitance voltage v C And a reference voltage
Figure FDA0003990769680000012
Comparing to obtain a voltage difference Deltav, inputting the Deltav into a PI regulator, and outputting a reference current ^ according to the regulator>
Figure FDA0003990769680000013
Reference current->
Figure FDA0003990769680000014
And through the inductor->
Figure FDA0003990769680000015
Is connected to the grid current->
Figure FDA0003990769680000016
And comparing to obtain a current difference value delta i, inputting the current difference value delta i into a current regulator, outputting a modulation ratio M by the current regulator, and inputting the modulation ratio M into the SPWM to further control a switching device in the three-phase inverter circuit.
2. The marine power supply system of claim 1, wherein said Z-source network comprises: a first capacitor (C) 2 ) A second capacitor (C) 3 ) A third capacitor (C) 1 ) A first inductor (L) 1 ) A second inductor (L) 2 ) A first resistor (r 1), a second resistor (r 2), a diode (D) 1 )；
The solar cell panel and a third capacitor (C) 1 ) In parallel, the anode of the solar panel and the third capacitor (C) 1 ) Is connected to the diode (D) 1 ) The anode of (2) is connected; the diode (D) 1 ) And said first capacitor (C) 2 ) Is connected with one end of the first resistor (r 1), the other end of the first resistor (r 1) is connected with the first inductor (L) 1 ) Is connected with one end of the connecting rod; the first inductance (L) 1 ) And the other end of said second capacitor (C) 3 ) The first end of the three-phase inverter circuit is connected with the anode of the three-phase inverter circuit; a cathode of the three-phase inverter circuit, one end of the second resistor (r 2), and the first capacitor (C) 2 ) Is connected with the second end of the first end; the first mentionedThe other end of the two resistors (r 2) and the second inductor (L) 2 ) Is connected to said second inductor (L) 2 ) And the other end of said second capacitor (C) 3 ) The second terminal of (A), the third capacitance (C) 1 ) Is connected with the second end of the first connector; the third capacitance (C) 1 ) The second end is connected with the cathode of the solar cell panel.
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