CN113370807B - Self-adaptive impedance matching method for deep-open-sea ship hydrogen storage direct current electric propulsion system - Google Patents

Self-adaptive impedance matching method for deep-open-sea ship hydrogen storage direct current electric propulsion system Download PDF

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CN113370807B
CN113370807B CN202110803883.XA CN202110803883A CN113370807B CN 113370807 B CN113370807 B CN 113370807B CN 202110803883 A CN202110803883 A CN 202110803883A CN 113370807 B CN113370807 B CN 113370807B
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ship
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electric propulsion
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CN113370807A (en
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王国玲
胡鑫
张瑞芳
杨荣峰
李振宇
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Jimei University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/75—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using propulsion power supplied by both fuel cells and batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/40—Electric propulsion with power supplied within the vehicle using propulsion power supplied by capacitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/40—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for controlling a combination of batteries and fuel cells
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/12—Use of propulsion power plant or units on vessels the vessels being motor-driven
    • B63H21/17—Use of propulsion power plant or units on vessels the vessels being motor-driven by electric motor
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2200/00—Type of vehicles
    • B60L2200/32—Waterborne vessels
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells

Abstract

The invention discloses a self-adaptive impedance matching method of a deep and remote marine hydrogen storage direct current electric propulsion system, which comprises a proton exchange membrane fuel cell power generation unit, an energy storage unit, a marine direct current electric propulsion unit, a constant power load unit, a resistance load unit and an impedance adaptation unit 6. The invention is based on the set values of the amplitude frequency margin and the phase frequency margin of the system, obtains the limited ship working condition and the running state of the hydrogen storage unit through pre-calculation, obtains the equivalent impedance value reference required by the system through query, and realizes the required equivalent impedance value through controlling the inductive current of the bidirectional Buck direct current power converter in the impedance adaptation unit so as to solve the problem of high-frequency instability caused by the negative impedance characteristic of the electric propulsion unit when the ship working condition of a ship power system taking a hydrogen fuel cell as a power source is switched. The method has good application prospect for improving the stability and reliability of the direct-current power system of the deep and far sea hydrogen storage direct-current power propulsion ship.

Description

Self-adaptive impedance matching method for deep-open-sea ship hydrogen storage direct current electric propulsion system
Technical Field
The invention belongs to the fields of ship and ocean engineering and new energy application, and particularly relates to a self-adaptive impedance matching method of a deep open sea ship hydrogen storage direct current electric propulsion system.
Background
With the increasing serious influence of the carbon emission of ships on the environment and the increasingly urgent international demand on new energy ships, the hydrogen fuel cell becomes the best choice for the ship electric propulsion device due to the advantages of high energy conversion efficiency, high energy density, zero carbon emission, low vibration noise, long service life and the like. The hydrogen fuel cell has soft external characteristics and poor dynamic characteristics, so the hydrogen fuel cell needs to be connected with an energy storage device in parallel, and a ship hydrogen storage power propulsion system is formed by utilizing the power fluctuation problem caused by the balance load change of the energy storage cell. The sea conditions of deep and far sea are relatively complex, the ship inevitably faces various bad sea conditions, and the passive change of the ship electric propulsion load highlights the random characteristic. How to ensure the normal navigation of the hydrogen storage and power propulsion ship when the sea condition is not good and the electric propulsion load changes randomly is a challenge to be faced in the process of developing the hydrogen storage and power propulsion ship to the deep open sea.
When the ship is normally sailed, the ship electric propulsion system is embodied as a constant-power load characteristic. When the working condition of the ship is changed through operation control, the constant-power load is reflected as negative impedance characteristic when the working condition is switched, the equivalent impedance of the system is easily reduced, once the equivalent impedance is reduced to be below zero, the ship electric system causes system oscillation due to lack of damping, and therefore an impedance self-adaptive matching technology needs to be added in the electric system to avoid the high-frequency instability problem caused by active working condition switching of the high-proportion electric propulsion load.
Therefore, aiming at the problem that the constant-power negative impedance characteristic of an electric propulsion system in a full-power electronic deep-open-sea ship hydrogen storage direct-current electric propulsion system has great influence on the stability of the system, an adaptive impedance matching method based on a system stability domain boundary condition and a stability margin is provided from the perspective of a system small-signal stability domain change rule, the high-frequency steady-state characteristic of the system is improved, and the stable power supply of the ship hydrogen storage direct-current electric propulsion system is ensured. Meanwhile, the method has important theoretical significance on long-term and reliable operation of the multi-energy micro-grid system in the fields of ships and oceans.
Disclosure of Invention
The invention aims to provide a self-adaptive impedance matching method of a hydrogen storage direct current electric propulsion system of a deep and far sea ship, which can dynamically adjust a required impedance value on the premise of ensuring a certain stability margin so as to improve the high-frequency stability and reliability of the hydrogen storage direct current electric propulsion system.
In order to achieve the purpose, the invention adopts the technical scheme that:
the self-adaptive impedance matching method of the deep open sea ship hydrogen storage direct current electric propulsion system comprises the following steps:
s1: listing input impedance Z of ship direct current electric propulsion unit under m ship working conditions EPi (i =1,2, \8230;, m) and n hydrogen storage unit operation states correspond to output impedance Z FBj (j =1,2, \ 8230;, n), the parallel equivalent impedance Z of the two impedances was calculated pij In total of m × n kinds, Z pij Obtained by the formula (1):
Figure BDA0003165568820000021
s2: according to the set value of the system amplitude-frequency margin GM and the phase-frequency margin PM and the set cut-off frequency omega c Cross over frequency omega g Range, obtaining the equivalent impedance Z that the impedance adaptation unit needs to provide vij The amplitude and phase angle are determined by the following equations (2) and (3):
|Z vij (ω g )|＝PM·|Z pij (ω g )| (2)
∠Z vij (ω c )＝180°+∠Z pij (ω c )-GM (3)
in the formulae (2) and (3), | Z vij (ω g )|、|Z pij (ω g ) Respectively is Z vij 、Z pij At cross-over frequency omega g Impedance amplitude of the junction, < Z > vij (ω c )、∠Z pij (ω c ) Is Z vij 、Z pij At a cut-off frequency omega c The phase angle of (d).
S3: listing the m × n impedance adaptation unit output equivalent impedance matrix Z v The input impedance Z of the ship direct current electric propulsion unit is changed according to the working condition of the ship EPi Output impedance Z with operation working state of hydrogen storage unit FBj By queryingObtaining a corresponding Z vij Under the control of a bidirectional Buck direct-current power converter in the impedance adaptation unit, the matching of the adaptive impedance of the system can be realized;
Figure BDA0003165568820000031
wherein, the control of the bidirectional Buck DC power converter in the impedance adaptation unit comprises the following steps:
(1) equivalent impedance adaptive control: obtaining an equivalent impedance value reference Z according to the working condition of the ship and the working state of the hydrogen storage unit vij Through the network side voltage v bus And ohm's law, converting the equivalent impedance to an equivalent impedance current reference i z_ref ；
(2) Controlling the voltage of the capacitor: for super capacitor voltage DC component V dca And a voltage setting reference V dca_ref Comparing and sending the error value to the capacitance voltage regulator G vdc (s)，G vdc (s) the output is a current reference i flowing from the bidirectional Buck DC power converter to the DC bus side c_ref ，i z_ref And i c_ref The sum of (1) is the converter inductor current reference i a_ref ；
(3) Modulation wave signal generation: inductor current i a Through a feedback link H ia (s) after obtaining the inductor current feedback i a_back Reference of the converter inductor current i a_ref And inductor current feedback i a_back Is passed through a current controller G ia And(s) performing pulse width modulation as a modulation wave, wherein the generated high-frequency chopping signal is used for controlling the on-off state of a power switch in the bidirectional Buck direct-current power converter.
The direct-current power system of the deep and open sea hydrogen storage direct-current electric propulsion ship comprises a proton exchange membrane fuel cell power generation unit, an energy storage unit, a ship direct-current electric propulsion unit, a constant-power load unit, a resistance load unit and an impedance adaptation unit; the output sides of the proton exchange membrane fuel cell power generation unit and the energy storage unit are both connected with a direct current bus, and the input sides of the ship direct current electric propulsion unit and the constant power load unit are both connected with the direct current bus; the resistance load unit is connected to the direct current bus; the impedance adaptation unit is formed by cascading a super capacitor and a bidirectional Buck direct-current power converter, and the output side of the bidirectional Buck direct-current power converter is connected to a direct-current bus.
Compared with the prior art, the invention has the advantages and beneficial effects that:
(1) Compared with the traditional solution, the method based on the boundary condition and the stability allowance of the stability domain of the system obtains the equivalent impedance required by the system according to the stability condition of the system by utilizing the limited working condition of the ship and the storage and transportation state of hydrogen, and through the equivalent impedance model of the system and the preset amplitude frequency allowance and phase frequency stability allowance, can change the impedance characteristic of the system at the switching moment of the working condition of the ship, and improves the stability and the reliability of a deep and open sea direct current electric propulsion ship taking a hydrogen fuel cell as a main power source.
(2) Compared with the traditional adaptive control method which has fixed control parameters and can not realize active damping, the invention acquires the required equivalent impedance characteristic in advance on the premise of ensuring a certain stability margin, and dynamically adjusts the impedance value required by the system through the control strategy of a bidirectional Buck direct-current power converter in an impedance adaptation unit, thereby realizing the dynamic adaptive matching of the impedance characteristic of the system.
(3) The invention directly aims at the problem of high-frequency oscillation caused by the negative impedance characteristic of the system, provides a solution from the source-load impedance characteristic perspective, and compared with a conventional method which adopts an ideal constant-power load model as a research object, the invention establishes the equivalent input impedance of the ship direct-current electric propulsion unit and the equivalent output impedance of the hydrogen storage unit under various working conditions of the ship in advance, and obtains the equivalent impedance characteristics of the system under different states in advance, so that the impedance characteristic of the system is adjusted before the high-frequency oscillation of the system occurs, and the system has no possibility of generating the high-frequency oscillation, and belongs to an active high-frequency oscillation inhibiting method.
(4) The invention is a virtual impedance self-adapting adjusting technique, which changes the impedance characteristic of the power circuit by the control method, thereby not generating any extra power loss in the system, and can fundamentally solve the high-frequency stability problem of the system.
(5) The capacitor voltage control module adopted by the invention for the super capacitor in the deep and far sea ship has better limitation on the amplitude safety margin of the voltage at two ends of the super capacitor, effectively ensures the safety amplitude of the voltage at two ends of the capacitor, prevents the capacitor from being broken down by overhigh voltage, and is beneficial to improving the transient state and steady state characteristics of the self-adaptive impedance unit of the super capacitor, thereby further improving the stability of the whole energy storage system and playing a vital role in the cooperative operation among all modules of the deep and far sea hydrogen storage direct current electric propulsion system.
(6) The invention is designed aiming at a high-proportion ship hydrogen storage direct-current electric propulsion system with large load power variation range and large randomness, improves the applicability of the hydrogen fuel cell applied to deep and far sea direct-current electric propulsion ships and the stability of the electric power system, provides a technical basis for long-term reliable and stable operation of the ship hydrogen storage electric propulsion system, and can be popularized to offshore independent direct-current power supply systems with large-proportion motor loads and constant-power loads, such as ocean platforms, islands and the like.
Drawings
FIG. 1 is a block diagram of a deep sea marine hydrogen storage DC electric propulsion system;
FIG. 2 is a schematic diagram of an equivalent circuit model of a DC bus side of a deep sea ship hydrogen storage DC electric propulsion system;
FIG. 3 is a principle of obtaining an impedance reference value of a hydrogen storage direct current electric propulsion system of a deep and open sea ship;
fig. 4 is a control schematic diagram of the deep open sea ship hydrogen storage direct current electric propulsion system.
Detailed Description
The method is further described in detail below with reference to the figures and the detailed description.
As shown in fig. 1, the deep and distant marine hydrogen storage direct current electric propulsion system adopts a single bus direct current power supply structure, and comprises a proton exchange membrane fuel cell PEMFC power generation unit 1, an energy storage unit 2, a marine direct current electric propulsion unit 3, a constant power load unit 4, a resistance load unit 5 and an impedance adaptation unit 6, wherein the PEMFC power generation unit is formed by cascading a PEMFC cell 11 and a unidirectional direct current power converter 12, and the output side of the unidirectional direct current power converter 12 is connected to a direct current bus 7; the energy storage unit 2 is formed by cascading a lithium battery 21 and a bidirectional direct-current power converter 22, and the output side of the bidirectional direct-current power converter 22 is connected to a direct-current bus 7; the PEMFC power generation unit 1 and the energy storage unit 2 are combined together to form a hydrogen storage unit 8 of the ship hydrogen storage direct-current electric propulsion system; the ship direct-current electric propulsion unit 3 comprises a bidirectional inverter 32, a permanent magnet synchronous motor 31 and a propeller 33, wherein the bidirectional inverter 32 and the permanent magnet synchronous motor 31 are cascaded, a mechanical rotating shaft of the permanent magnet synchronous motor is directly connected with a rotating shaft of the propeller 33, and the input side of the bidirectional inverter is connected with a direct-current bus 7; the constant power load unit 4 is composed of two forms: the first form is formed by cascading a direct current power converter 41 and a direct current load 42, the second form is formed by cascading an inverter 43 and an alternating current load 44, and constant power load units in the two forms are connected to a direct current bus 7 through the input side of the power converter; the resistance load unit 5 is directly connected to the direct current bus 7 to serve as a resistance load; the impedance adaptation unit 6 is formed by cascading a super capacitor 61 and a bidirectional Buck direct-current power converter 62, and the output side of the bidirectional Buck direct-current power converter is connected to the direct-current bus 7.
The proportion of the ship direct-current electric propulsion unit 3 in the total load of the ship is high, the ship working condition and the electric propulsion load characteristic have a corresponding relation, and when the ship working condition is switched, the negative impedance characteristic presented by sudden change of the load is easy to cause high-frequency instability of a ship hydrogen storage direct-current electric propulsion system; the hydrogen fuel cell has stable working state and the hydrogen storage unit has limited running state. Setting the ship working conditions to be m, and setting the input impedance of the ship direct current electric propulsion unit to be Z EPi (i =1,2, \8230;, m); assuming that the hydrogen storage unit has n operating states, the corresponding output impedance is set to Z FBj (j =1,2, \8230;, n). Because the system DC power system source side and the load side are relatively fixed, the system DC power system source side and the load side can be different in advanceRegarding each unit of the system as an independent subsystem, respectively establishing an output port Thevenin equivalent impedance model according to the control structure and topology of each unit on the level of a small signal of the system, and integrating the output port Thevenin equivalent impedance models into an equivalent impedance model of the system to obtain a direct-current bus side equivalent circuit model of the ship hydrogen storage direct-current electric propulsion system, as shown in FIG. 2.
The self-adaptive impedance matching method of the deep sea ship hydrogen storage direct current electric propulsion system provides a method for solving high-frequency instability for the full electric electronic ship hydrogen storage direct current electric propulsion system, the basic principle of obtaining the impedance reference value is shown in figure 3, and the input impedance Z is based on the ship direct current electric propulsion unit EPi And the output impedance Z of the hydrogen storage unit FBj Determining the output equivalent impedance Z of the impedance adaptation unit according to the set system amplitude-frequency margin GM and phase-frequency margin PM vij (ii) a And through controlling the impedance adaptation units, obtaining the output equivalent impedance of each required impedance adaptation unit, and further realizing the self-adaptive impedance matching of the deep and far sea hydrogen storage direct current electric propulsion ship.
The invention discloses a self-adaptive impedance matching method of a hydrogen storage direct current electric propulsion system of a deep and far sea ship, which is realized by controlling a bidirectional Buck direct current power converter, and comprises the following steps:
s1: listing input impedance Z of ship direct current electric propulsion unit under m ship working conditions EPi (i =1,2, \ 8230;, m) and n hydrogen storage unit operation states correspond to output impedance Z FBj (j =1,2, \8230;, n), the parallel equivalent impedance Z of the two impedances is calculated pij In total of m × n kinds, Z pij Can be obtained from the following formula
Figure BDA0003165568820000081
S2: according to the set value of the system amplitude margin GM and the phase frequency margin PM and the set cut-off frequency omega c Cross over frequency omega g Range, obtaining the equivalent impedance Z that the impedance adaptation unit needs to provide vij The amplitude and phase angle are determined by the following formula:
|Z vij (ω g )|＝PM·|Z pij (ω g )| (2)
∠Z vij (ω c )＝180°+∠Z pij (ω c )＝GM (3)
wherein, | Z vij (ω g )|、|Z pij (ω g ) Respectively is Z vij 、Z pij At cross-over frequency omega g Impedance amplitude of the junction, < Z > vij (ω c )、∠Z pij (ω c ) Is Z vij 、Z pij At a cut-off frequency omega c The phase angle of (c).
S3: listing the m × n impedance adaptation unit output equivalent impedance matrix Z v The input impedance Z of the direct current propulsion unit of the ship is changed according to the working condition of the ship EPi Output impedance Z with operation working state of hydrogen storage unit FBj Obtaining corresponding Z by querying vij And the matching of the self-adaptive impedance of the system can be realized by controlling the bidirectional Buck direct-current converter in the impedance adapting unit.
Figure BDA0003165568820000082
As shown in fig. 4, the control of the bidirectional Buck dc converter in the impedance adapting unit includes the following steps: (1) performing equivalent impedance self-adaptive control; (2) controlling the voltage of the capacitor; (3) and generating a modulation wave signal.
The step of the equivalent impedance self-adaptive control is to obtain an equivalent impedance value reference Z according to the working condition of the ship and the working state of the hydrogen storage unit vij Through the network side voltage v bus And ohm's law, i.e. equivalent impedance is converted into an equivalent impedance current reference i z_ref 。
The capacitor voltage control step is to control the direct current component V of the super capacitor voltage dca And a voltage setting reference V dca_ref Comparing and sending the error value to the capacitance voltage regulator G vdc (s)，G vdc (s) output as a bidirectional Buck DC power converterCurrent reference i to the dc bus side c_ref ，i z_ref And i c_ref The sum of (1) is the converter inductor current reference i a_ref 。
The modulated wave signal generating step is: inductor current i a Through a feedback link H ia After(s), obtaining an inductor current feedback i a_back Reference of the converter inductor current i a_ref And inductor current feedback i a_back Is measured by a current controller G ia And(s) performing Pulse Width Modulation (PWM) as a modulation wave, wherein the generated high-frequency chopping signal is used for controlling the on-off state of a power switch in the bidirectional Buck direct-current power converter.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.

Claims (3)

1. The self-adaptive impedance matching method of the deep open sea ship hydrogen storage direct current electric propulsion system is characterized by comprising the following steps of:
s1: listing input impedance Z of ship direct current electric propulsion unit under m ship working conditions EPi (i =1,2, \ 8230;, m) and n hydrogen storage unit operation states correspond to output impedance Z FBj (j =1,2, \ 8230;, n), the parallel equivalent impedance Z of the two impedances was calculated pij In total of m × n kinds, Z pij Obtained by the formula (1):
Figure FDA0003165568810000011
s2: according to the set value of the system amplitude margin GM and the phase frequency margin PM and the set cut-off frequency omega c Cross over frequency omega g Range, obtaining the equivalent impedance Z that the impedance adaptation unit needs to provide vij The amplitude and phase angle are determined by the following equations (2) and (3):
|Z vij (ω g )|＝PM·|Z pij (ω g )| (2)
∠Z vij (ω c )＝180°+∠Z pij (ω c )-GM (3)
in the formulas (2) and (3), | Z vij (ω g )|、|Z pij (ω g ) Each is Z vij 、Z pij At a cross-over frequency omega g The impedance amplitude of the position, angle Z vij (ω c )、∠Z pij (ω c ) Is Z vij 、Z pij At a cut-off frequency omega c The phase angle of (d);
s3: listing the m × n impedance adaptation unit output equivalent impedance matrix Z v The input impedance Z of the ship direct current electric propulsion unit is changed according to the working condition of the ship EPi Output impedance Z corresponding to hydrogen storage unit operation state FBj Obtaining corresponding Z by querying vij And then, controlling a bidirectional Buck direct-current power converter in the impedance adaptation unit, so that the matching of the system self-adaptive impedance can be realized:
Figure FDA0003165568810000021
2. the adaptive impedance matching method of a deep sea vessel hydrogen storage direct current electric propulsion system according to claim 1, characterized in that the control of the bidirectional Buck direct current power converter (62) in the impedance adaptation unit comprises the steps of:
(1) equivalent impedance adaptive control: obtaining an equivalent impedance value reference Z according to the working condition of the ship and the working state of the hydrogen storage unit vij Through the network side voltage v bus And ohm's law, converting the equivalent impedance to an equivalent impedance current reference i z_ref ；
(2) Controlling the voltage of the capacitor: for super capacitor voltage DC component V dca And a voltage setting reference V dca_ref Comparing and sending the error value to the capacitance voltage regulator G vdc (s)，G vdc (s) the output is a current reference i of the bidirectional Buck DC power converter flowing to the DC bus side c_ref ，i z_ref And i c_ref The sum of (1) is the converter inductorCurrent reference i a_ref ；
(3) Modulation wave signal generation: inductor current i a Through a feedback link H ia After(s), obtaining an inductor current feedback i a_back Reference of the converter inductor current i a_ref And inductor current feedback i a_back Is measured by a current controller G ia And(s) performing pulse width modulation as a modulation wave, wherein the generated high-frequency chopping signal is used for controlling the on-off state of a power switch in the bidirectional Buck direct-current power converter.
3. The adaptive impedance matching method of a deep-open-sea ship hydrogen-storage direct-current electric propulsion system according to claim 1 or 2, wherein the deep-open-sea ship hydrogen-storage direct-current electric propulsion system comprises a proton exchange membrane fuel cell power generation unit (1), an energy storage unit (2), a ship direct-current electric propulsion unit (3), a constant-power load unit (4), a resistive load unit (5) and an impedance adaptation unit (6), and is characterized in that: the output sides of the proton exchange membrane fuel cell power generation unit (1) and the energy storage unit (2) are both connected with a direct current bus (7), and the input sides of the ship direct current electric propulsion unit (3) and the constant power load unit (4) are both connected with the direct current bus (7); the resistance load unit (5) is connected to a direct current bus (7); the impedance adaptation unit (6) is formed by cascading a super capacitor (61) and a bidirectional Buck direct-current power converter (62), and the output side of the bidirectional Buck direct-current power converter (62) is connected to a direct-current bus (7).
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CN110601268A (en) * 2019-10-29 2019-12-20 中国石油大学(华东) Doubly-fed fan grid-connected port output impedance modeling and stability analysis method
CN112039381A (en) * 2020-09-28 2020-12-04 华中科技大学 Equivalent circuit impedance model, impedance ratio matrix obtaining and stability analysis method

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