CN112564253A

CN112564253A - Green energy system of new energy yacht and energy matching management method

Info

Publication number: CN112564253A
Application number: CN202011453268.2A
Authority: CN
Inventors: 孔慧; 潘雨婷; 易宏
Original assignee: Shanghai Jiaotong University
Current assignee: Shanghai Jiaotong University
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2021-03-26
Anticipated expiration: 2040-12-11
Also published as: CN112564253B

Abstract

The invention provides a green energy system of a new energy yacht and an energy matching management method, which comprise the following steps: the system comprises a solar power generation module, a wind power generation module, a diesel power generation module, a storage battery and an energy management module; the direct current output ends of the solar power generation module, the wind power generation module and the diesel power generation module are electrically connected with the storage battery; the output end of the storage battery and the direct current output end of the diesel power generation module are electrically connected with the electric equipment through a direct current bus bar, and the alternating current output ends of the solar power generation module and the wind power generation module are electrically connected with the electric equipment through an alternating current bus bar; the energy management module monitors the solar power generation module, the wind power generation module, the diesel power generation module and the power utilization equipment in real time and switches the power supply mode according to the running working condition of the yacht. The invention ensures that the whole system operates in the range of high efficiency and energy loss saving. And a reasonable strategy is formulated, so that each unit can work in a stable and efficient range, and the performance of the whole system is ensured.

Description

Green energy system of new energy yacht and energy matching management method

Technical Field

The invention relates to the field of power management systems, in particular to a green energy system of a new energy yacht and an energy matching management method.

Background

In recent years, some conventional energy sources such as petroleum energy, natural gas energy, and the like are being exhausted, and environmental pollution caused by the conventional energy sources in the field of ships is becoming serious. Meanwhile, policies for promoting and encouraging the use of new energy are released everywhere, so that the green ship technology becomes one of important development directions in the field of ships.

A conventional green energy ship, namely a sailing ship, drives a sail to carry out a course by utilizing wind power, but is greatly influenced by weather, and cannot sail under the condition of insufficient wind power.

At present, a plurality of green energy sources such as solar energy or wind energy and the like are used on a yacht by using a single energy source, but the two energy sources are not mixed as a power source to drive a small fishing boat. Meanwhile, the energy management system is the most important control nerve center for the new energy ship, and the balance of energy input, energy storage and energy output is coordinated. Therefore, it is very important to design an energy management system that uses solar energy and wind energy as energy sources.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a green energy system and an energy matching management method for a new energy yacht.

According to the green energy system of the new energy yacht provided by the invention, the system comprises: the system comprises a solar power generation module, a wind power generation module, a diesel power generation module, a storage battery and an energy management module;

the direct current output ends of the solar power generation module, the wind power generation module and the diesel power generation module are electrically connected with the storage battery;

the output end of the storage battery and the direct current output end of the diesel power generation module are electrically connected with electric equipment through a direct current bus bar, and the alternating current output ends of the solar power generation module and the wind power generation module are electrically connected with the electric equipment through an alternating current bus bar;

the energy management module monitors the solar power generation module, the wind power generation module, the diesel power generation module and the electric equipment in real time, and switches power supply modes according to the running working conditions of the yacht.

Preferably, the power supply mode includes:

the power supply mode of the storage battery: the solar power generation module and the wind power generation module charge the storage battery, and the storage battery supplies power to the direct-current busbar;

hybrid power supply mode: the solar power generation module and the wind power generation module charge the storage battery, and power is supplied to the direct-current busbar through the storage battery and the diesel power generation module;

a diesel power generation mode: and supplying power to the storage battery and the direct current bus bar through the diesel power generation module.

Preferably, the system further comprises a shore power interface, wherein the shore power interface is electrically connected with the storage battery, and the storage battery is charged by an onshore power supply.

Preferably, the system further comprises a communication module, and the communication module is connected with the outside through a wireless network.

Preferably, the solar power generation module includes: the solar energy storage system comprises a photovoltaic module, a solar storage battery, a controller and an inverter;

the output end of the photovoltaic module is connected with the solar storage battery and the controller, the solar storage battery is connected with the storage battery through DC/DC, and the controller is connected with the solar storage battery, the inverter and the energy management module.

Preferably, the wind power generation module includes: the system comprises a wind driven generator, a wind power storage battery, a controller and an inverter;

the output end of the wind driven generator is connected with the wind power storage battery and the controller through the inverter, the wind power storage battery is connected with the storage battery through DC/DC, and the controller is connected with the wind power storage battery and the energy management module.

Preferably, the energy management module monitors the solar power generation module, the wind power generation module, the diesel power generation module and the electric equipment in real time through a CAN bus.

Preferably, the operation conditions include: navigation working condition, floating stopping working condition, parking working condition and emergency working condition.

Preferably, the diesel power generation module comprises a generator operating condition and a host operating condition;

under the working condition of the generator, the rotating speed of a diesel engine in the diesel generating module is unchanged, and the storage battery is charged; under the working condition of the main engine, the diesel power generation module drives the propeller, and the power of the diesel power generation module is in direct proportion to the rotating speed of the propeller.

According to the energy matching management method of the green energy system of the new energy yacht, provided by the invention, the method comprises the following steps:

step S1, judging whether all the required power of the yacht is zero, entering a shore power charging mode when the required power is zero, and charging the storage battery by Alternating Current (AC)/Direct Current (DC) sent out on the shore;

step S2, judging whether the propeller power is 0;

step S3, entering a storage battery power supply mode under the condition that the judgment result in the step S2 is 0, judging whether the SOC value of the storage battery is larger than the optimal SOC value of the storage battery, if so, taking all the required power of the yacht as the output power of the storage battery, and if not, taking the power distribution condition that all the required power of the yacht is the output power of the storage battery, and simultaneously charging the storage battery by the solar power generation module and the wind power generation module through a DC/DC converter and an AC/DC converter;

step S4, in the state that the judgment result of step S2 is not 0, whether the SOC value of the storage battery is larger than the upper limit value of the SOC state of the storage battery is judged, if so, a hybrid power supply mode is entered, at the moment, the capacity of the storage battery is consumed to SOC, the diesel generator is temporarily in standby, the storage battery mainly generates power, meanwhile, the solar power generation module and the wind power generation module charge the storage battery through the DC/DC converter and the AC/DC converter, and the SOC of the storage battery is continuously reduced at the stage until the SOC is smaller than the upper limit value of the SOC, and the step S5 is entered;

step S5, judging whether the SOC is larger than a safety lower limit, if so, continuing to judge whether the SOC is equal to zero, if so, entering a diesel emergency starting mode, wherein the output power of the diesel engine is the power of a propeller, and if not, the diesel generator not only supplies power to the system, but also charges a storage battery to the SOC position;

and step S6, judging whether the SOC value of the storage battery is larger than the optimal SOC value, if so, adopting a hybrid power supply mode, at the moment, needing the storage battery to discharge part of electricity to reach the SOC, wherein the power required by the yacht system is the sum of the output power of the diesel generator and the output power of the storage battery, meanwhile, the solar power generation module and the wind power generation module supply power to the storage battery, if the SOC is lower than the SOC, the solar power generation module and the wind power generation module mainly use diesel power generation, the power required by the yacht is the sum of the output power of the diesel generator and the output power of the storage battery, and the solar power generation module and the wind power.

Compared with the prior art, the invention has the following beneficial effects:

the invention ensures that the whole system operates in the range of high efficiency and energy loss saving. And a reasonable strategy is formulated, so that each unit can work in a stable and efficient range, and the performance of the whole system is ensured.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a diagram of an energy management system architecture;

FIG. 2 is a schematic diagram of a CAN bus-based energy management system communication network;

FIG. 3 is a schematic diagram of a combination of an energy management system and a communication system;

FIG. 4 is a flow chart of an energy management system control strategy;

FIG. 5 is a diagram of lithium battery voltage versus SOC.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.

For a new energy yacht, an energy management system is a central system which coordinates all energy systems to achieve the purposes of minimum power loss and optimal performance. The energy management system is designed in a mode of integrating multiple power generation modes, storing electricity by a storage battery, supplying power to each power consumption device of the yacht and fully electrically propelling a motor. This system has several functions as follows.

(1) Energy management system monitors each power consumption and power generation equipment in real time

(2) Switching use modes according to sailing working conditions

(3) And energy optimization control is carried out to optimize the economy and the dynamic performance of the yacht.

Specifically, the scheme designs an energy management system based on solar photovoltaic power generation set, wind power generation set, diesel generating set and shore power charging.

The yacht energy management system has the following working modes.

(1) The power supply mode of the storage battery: in the mode, the solar energy and the wind energy continuously charge the battery, and the battery supplies power to the yacht system. The input power of the yacht system is mainly provided by a storage battery, and the input power of the storage battery is provided by solar energy and wind energy.

(2) Hybrid power supply mode: in the mode, the solar energy and the wind energy continuously charge the battery, and the battery supplies power to the system and the diesel generator generates power to the system simultaneously. Namely, the system power is provided by the storage battery and the diesel generator together.

(3) A diesel power generation mode: the diesel generating set supplies power to the whole system, and the storage battery is fully charged. The propeller is in an operating state at this time.

(4) Shore power mode: in the mode, the shore-based power supply supplies power to the battery when the yacht is in a parking state. The input power of the storage battery is the shore power supply power, and the shore power is used for fully charging the storage battery after one night.

(5) Diesel emergency starting mode: in this mode, if special conditions such as failure or bad weather are met, a diesel engine can be used as a main engine, and the main engine directly drives a propeller to propel.

The detailed selection of the yacht operation conditions and the corresponding operation modes is shown in the following table.

TABLE 4-1 yacht working mode selection table

As shown in fig. 1, the solar power generation system has the following components: photovoltaic module (energy input), battery (energy storage), controller (detection and control), inverter (AC/DC). The system inputs energy from the photovoltaic module end, outputs electric energy after conversion, and part of electricity is stored in the storage battery and can be directly used through DC/DC. The controller can detect the state of the equipment and reflect the running state of the system. The inverter functions to allow the ac load to be used.

The wind power generation system includes a wind power generator (generating alternating current), a battery (storage function), a controller (detecting and controlling), and an inverter (AC/DC), and functions similar to those of the aforementioned solar power generation system.

The shore power generation system utilizes a shore-based power supply to replace other power generation modes, so that the yacht can be charged when leaning against the shore. Since the shore power supply voltage is 220V alternating current, an alternating current-direct current converter is needed when the shore power supply is connected to a yacht system.

The diesel power generation system includes a diesel engine, a generator, a fuel tank, a controller, and the like. The diesel engine drives the generator to generate alternating current through diesel oil, and the alternating current can be transmitted to the storage battery or the whole propulsion system through the alternating current-direct current converter. The diesel engine can also directly drive the propeller to realize the propelling function.

The yacht storage battery is the most main energy storage and power storage system of the yacht. The storage battery stores electric energy from a solar power generation set, a wind power generation set, shore power generation and a diesel generator, and can generate 24V direct current, 320V direct current and 220V alternating current through three internal direct current and alternating current converters.

The direct current bus bar is connected with all direct current lines from all power generation systems, including a solar power generation set, a wind power generation set, shore power generation and diesel generator direct current wiring, and outputs 24V direct current and 320V direct current to supply direct current power utilization equipment such as a closestool, a sound box, an electric sunshade, a bow side push and the like. The alternating current bus bar is connected with all alternating current lines from all power generation systems, including a solar power generation set, a wind power generation set, shore power generation and diesel generator direct current wiring, and outputs 220V alternating current to supply to some alternating current electric equipment and the like.

The yacht energy management system monitoring module EMS is connected with all lines from DC/DC, AC/DC and DC/AC of the DC/AC converters, lines from internal controllers of each system, and lines from a DC bus bar and an AC bus bar.

Besides the propulsion equipment, other domestic electric equipment is arranged on the yacht. Specifically, the electric power utilization equipment can be divided into propelling electric power utilization equipment, living electric power utilization equipment and power positioning equipment according to the power utilization equipment.

The storage battery is used as a key node for energy input and energy output, and has the characteristics of quick response of energy flow, long service life, safety and the like. The lithium iron phosphate battery has the characteristics of wide working range, high nominal voltage, high efficiency and the like, and meets the requirements of quick charge and discharge. The performance index of the battery includes a State of charge (SOC) in addition to a voltage and a capacity, and the following equation is given:

in the formula:

SOC, which is an index indicating the remaining capacity of the battery, a value of 0 means that the battery is completely discharged, and a value of 1 means that the remaining capacity of the battery is the rated capacity;

Q_s-leaving a battery asResidual capacity, unit Ah;

q-is the rated capacity of the battery, and the unit Ah.

The diesel generator is a reserve power generation source on the yacht. The whole unit consists of a diesel engine, a generator, a fuel tank and the like. The working principle of the diesel generator set is that under the condition that a power source is diesel, the diesel engine carries out diesel-kinetic energy conversion, so that the generator generates electricity through kinetic energy-electric energy conversion. In this yacht design, the diesel engine needs to satisfy the power generation and makes the propeller go on voyage or return voyage operating mode that continuous work is above operating mode 1 or the condition 4 condition that emergency use diesel oil directly as the power supply. Working condition 4 is the biggest design condition to diesel generating set capacity, breaks down at power generation equipment such as yacht battery, or need make safe back voyage of yacht under economic navigational speed when bad weather. The working condition 1 is a power generation condition, namely that the diesel power generation set, the solar energy and the wind energy continuously charge the battery, the battery supplies power to the system or the diesel power generation set supplies power to the system, and the storage battery is fully charged.

The operation of the diesel engine mainly has the following two working conditions. The working condition of the generator is that the diesel engine is used as the main power to drive the generator to generate electricity, and the rotating speed of the diesel engine is basically unchanged. The working condition of the main engine is that the diesel engine is directly connected with the propeller to propel, the power of the diesel engine can be changed, and the rotating speed of the diesel engine meets the requirement that Pe is Cn³. Considering that the diesel engine is emergency power and daily power generation, the power of the diesel engine is not necessarily large, and the condition that the power of a main engine is about 30kW when the economic navigational speed is about 8 knots is maximally met. In the design, the diesel engine cabin is positioned between 10# -13# ribs, the rib spacing is 500mm, and the size of the cabin which can be provided is 1.5m × 1.4m × 3 m. Therefore, two 15kW diesel generator sets can be determined, the total power of the diesel generator sets is 30kW, the rated voltage is 220V alternating current, the type is single three-phase, and the power factor is 0.8. The output power of a single diesel engine is 15 kW. The power of the diesel engine is 16.5 kW.

The required voltage of each part in the circuit has a difference of alternating current and direct current, and the values are different. Thus, the converter is used to unify the voltages. Common converters are classified into inverters and rectifiers. The rectifier is an ac (alternating current)/dc (direct current) converter, and can convert ac power into dc power. The inverter is a DC/AC converter that can convert direct current to alternating current. In this design, six main converters are mainly involved. Three 220VAC to 320VDC rectifiers, a 33.75VDC to 320VDC dc converter, a 320VDC to 24VDC dc converter, and a 320VDC to 220VAC inverter, respectively. Since 220VAC/320VDC and 320VDC/220VAC inverters are relatively common, DC/DC converters of unusual voltages are considered herein for illustration in converter design due to similar considerations for parameters of DC/DC boost and buck. When the converter works, the CCM mode condition is selected, and the converter is characterized in that the inductive current is continuous.

A 33.75 VDC-to-320 VDC dc converter is used to allow the photovoltaic power system to be well connected in voltage to the battery. A BOOST converter is used.

The duty ratio regulating value is as follows:

the value range of the inductance is as follows:

the value range of the capacitance is as follows:

in the formula: d is a duty ratio adjusting value;

lmin-is inductance low value (H);

cmax-is the capacitance high value (F);

I_out-is the output current (a);

ΔU_out-is the ripple voltage (V);

U_in-inputting a voltage (V) to the converter;

f-is the frequency (Hz) of the switching tube, which is 200.

Considering that the system has a plurality of control modules, such as a solar power generation module, a wind power generation module, a diesel power generation module, and the like, the energy management system also needs to further adjust parameters according to the parameter characteristics and feedback information of each module, and carries out optimization according to strategies. Therefore, the convenience and efficiency of the system communication network are very important, which can improve the efficiency of the whole system, so that the control implemented according to the control strategy can achieve the optimal result. The energy management system using the CAN bus has several advantages.

(1) The CAN bus has high communication speed and response speed. Because the message is coded simply, the time of occupying the bus is short, and the processing speed is high. High rates are required for energy management system operational mode switching on a yacht.

(2) And (4) selectively receiving data. Whether a message is useful and whether it is accepted or masked is discriminated by the identifier of the message. The occupied space can be reduced, and the efficiency is improved.

(3) The production and use cost of the bus is low. The CAN bus technology is continuously developed, and the production cost of related components of the bus is reduced.

In the design, a schematic diagram is drawn by taking a CAN bus as a bridge of a system communication network, and is shown in FIG. 2.

The energy management system communication network mainly comprises the following components or modules: the system comprises an upper computer, an energy management controller, an Anybus, a CAN bus, controllers of all power generation systems, all direct current and alternating current converters, a direct current bus and alternating current bus bar, a propulsion part and other power utilization equipment. The upper computer is a monitoring machine (PC) and is mainly responsible for displaying parameters and equipment states of all units in real time, monitoring data receiving and sending conditions of all nodes and sending control commands or parameter adjusting commands. The energy management controller is a transfer station for communication data and converts a data format transmitted by the upper computer into a DP format which can be read by Anybus. Anybus is a module for converting communication protocols. It provides a data storage area, and reads the data on the bus into the storage area, and converts it into DP format to send out according to the requirement. The data that whole CAN bus CAN gather have the current, the voltage parameter of each power generation system, the input/output voltage condition of each controller, the voltage condition of each converter, the battery voltage, current, SOC value etc. the condition, propulsion system input/output voltage current condition, other consumer voltage current condition and other parameters that need to know.

The energy management system adjusts and feeds back parameters such as voltage, current, power and SOC acquired by the CAN bus according to a set strategy, and the result CAN be fed back to each controller and other components by each node, so that the energy management of the intelligent networked yacht is realized.

The overall design of the energy management system is made by combining the structural design and the communication design of the energy management system and taking the yacht structure as the base, as shown in fig. 3.

As the yacht comprises a solar power generation system, a wind power generation system, a shore power generation system, a diesel power generation system, a storage battery storage and discharge system, a propulsion system and other systems, the conversion of various new energy sources and electric energy is involved, so that the complexity of the whole energy management system is increased. The basic requirement of the energy management system control strategy is that a plurality of units in the system are distributed by using preset rules and frames under certain restrictive conditions, so that the whole system operates in the range of high efficiency and energy loss saving. And a reasonable strategy is formulated, so that each unit can work in a stable and efficient range, and the performance of the whole system is ensured.

The control strategy aiming at the energy management system comprises a switch type control strategy, a power following type control strategy, a fuzzy algorithm-based control strategy, a neural network algorithm-based intelligent control strategy and the like. However, the first and second strategies are generally applicable to a wide range, simple, efficient and generally applicable. The following is directed to two control strategies.

(1) The switching control strategy is a strategy in which a battery SOC parameter is controlled. The aim is to save energy, reduce energy consumption and ensure that the storage battery is charged and discharged within a certain safe range. The storage battery pack is adjusted according to the power condition to meet the requirements of various working conditions of the yacht. The basic strategy is to shut down the storage battery equipment, charge the storage battery equipment by other power generation equipment and supply power to the yacht when the SOC value of the storage battery is lower than the set SOC safety lower limit. At this moment, the yacht system power comprises the insufficient power of the storage battery, and is provided by other equipment. And when the SOC value is larger than the set safety upper limit, the power is supplied to the yacht by the storage battery system. When the SOC value is between the upper limit and the lower limit of the set SOC safety, the power supply equipment state at the last moment determines which equipment continues to supply power at the next moment.

(2) The power-follow type control strategy is a strategy based on an optimal SOC value. The aim is to enable the SOC value of the storage battery to float up and down around the set optimal SOC value and to approach the SOC value as much as possible, and other power generation equipment adjusts and matches the state of the SOC value of the storage battery from the optimal SOC value along with the power required by the yacht. When the SOC of the storage battery is in a safe range and is higher than the optimal SOC value, other power generation equipment and the storage battery are enabled to supply power to the yacht together. The battery power supply reduces the SOC value of the battery to the optimal SOC value. When the SOC is within the safe range and less than the optimal SOC value, the other power generation devices supply power to the system and charge the storage battery so that the SOC rises to the optimal SOC value. Other power generation devices need to give priority to the state where the battery SOC is away from the optimum SOC value when operating.

The above two methods have both advantages and disadvantages. The switch type control strategy is simple, and the working points of other power generation equipment such as a diesel generator can be fixed, and the adjustment can be carried out according to whether the SOC value of the storage battery is in a safe range or not. However, the disadvantage is that the batteries are always in deep circulation, which is likely to cause losses, reduce life, and make it difficult to achieve optimal energy distribution of the system. The power following type control strategy has the advantages that the optimal SOC value is followed, so that the electric quantity increasing and decreasing amplitude of the storage battery is reduced, the service life is prolonged, and the power can be supplied to the yacht through the storage battery in time. But the defects are that other electric equipment has a large working power range and is not stable enough.

The control strategy of the energy management system has the following aims:

(1) the battery SOC value is preferentially determined as a logic core so that the state of charge (remaining capacity) of the battery is maintained within a safe operating range. The loss of the storage battery is reduced as much as possible.

(2) Each mode of the yacht energy management system can be timely switched and responded. And the whole system can operate in a range with high efficiency and low energy loss.

The most important parameter in the whole energy management system is the SOC threshold value. In the power-follow control strategy, an SOC threshold value is preset, and when the SOC exceeds or falls below the value, the next judgment logic is triggered. SOC_maxFor safety upper limit value, SOC_minFor a safe lower limit, the corresponding value is SOC_max＝0.4，SOC_min0.8. The core SOC in this strategy is the battery optimum state of charge, corresponding to a value of 0.6. And making a strategy according to the power condition corresponding to each working mode. The execution strategy is shown in fig. 4. Some of these parameters are defined as follows:

(1) px is the power required by all systems of the yacht

(2) Pshore power supply for shore

(3) Pin is storage battery charging power

(4) Pp is propeller power

(5) SOC is the state of charge of the battery

(6) SOC as optimum state of charge of accumulator

(7)SOC_maxFor the upper safety limit of the state of charge of the storage battery

(8)SOC_minFor the lower safety limit of the state of charge of the accumulator

(9) Pout is output power of storage battery

(10) Psun is solar energy system output power

(11) Pwind is the output power of wind energy system

(12) Output power of generator by Poutc

(13) Pch is output power of diesel engine

As shown in fig. 4, the entire energy management system control strategy is described as follows.

Firstly, the system judges whether each system of the yacht CAN be normally started or not according to information such as voltage, current, temperature and the like transmitted by each node on the CAN bus. If not, an error location is displayed and the fault is handled.

And judging whether the required power of all the systems of the yacht is zero or not. When the required power is zero, a shore power charging mode is entered, the alternating current generated on the shore is used for charging the storage battery through the AC/DC, and the shore power is used as the storage battery charging power.

And judging whether the required power of all systems of the yacht is greater than zero, wherein the condition that the required power is negative is not considered for the moment.

It is determined whether the propeller power is zero, i.e. whether the propeller needs to be used. If the system is not required to be used, the system is in a storage battery power supply mode at the moment. It is determined whether the battery SOC value is greater than the optimum battery SOC value. And if the power is larger than the preset power, all the required power of the yacht system is the output power of the storage battery. If the power is less than the preset power, the power distribution condition is that all required power of the yacht is output power of the storage battery, and meanwhile, the solar energy system and the wind energy system charge the storage battery through the DC/DC converter and the AC/DC converter.

And judging whether the SOC value of the storage battery is greater than the upper limit value of the state of charge of the storage battery or not on the basis that the power of the propeller is not zero, if so, entering a hybrid power supply mode, and mainly consuming the capacity of the storage battery to SOC, temporarily waiting the diesel generator and mainly generating power by the storage battery. Meanwhile, the solar energy system and the wind energy system charge the storage battery through the DC/DC converter and the AC/DC converter. And the SOC of the storage battery is continuously reduced at the stage until the SOC is less than the upper SOC limit, and the next judgment can be participated.

And judging whether the SOC is greater than the safety lower limit, and if so, continuously judging whether the SOC is equal to zero. If the voltage is equal to zero, the storage battery is in a completely dead state, or a fault occurs, the diesel emergency starting mode is entered, and the output power of the diesel is the power of the propeller. If not, it means that the remaining capacity of the battery is insufficient. At this time, the diesel generator not only supplies power to the system, but also charges the storage battery to the SOC. The specific input power of the storage battery is determined by the optimal SOC value and the current SOC difference value.

And judging whether the SOC value of the storage battery is larger than the optimal SOC value or not, if so, adopting a hybrid power supply mode, wherein the storage battery is required to discharge part of power to achieve the SOC, the generator is matched with the storage battery to generate power, and the power required by the yacht system is the sum of the output power of the diesel generator and the output power of the storage battery. And meanwhile, the solar energy system and the wind energy system supply power to the storage battery. If the SOC is lower than the SOC, the diesel power generation is mainly used, and the power required by the yacht system is the sum of the output power of the diesel generator and the output power of the storage battery. The solar energy system and the wind energy system charge the storage battery to SOC.

And performing energy management matching under each mode according to the established control strategy.

Battery powered mode

The conditions for triggering the battery-powered mode are that the yacht demand power is greater than zero and that the propulsion power is equal to zero. At the moment, the power consumption of other load equipment on the yacht is assumed to be 4.5kW of common equipment power, the power consumption is about five hours, the power consumption of non-common equipment is 16.27kW, and the power consumption is one hour. The other load electricity usage can be calculated to be 6.46kW per hour. When the SOC is lower than the SOC, namely 0.6, the solar energy and wind energy system is started and supplies power to the storage battery. The amount of charge was 1.1kW per hour.

For the detection of the SOC of the lithium battery, some common methods such as an open-circuit voltage method measure the open-circuit voltage after the lithium battery is statically placed for a long time, and the open-circuit voltage and the SOC satisfy a certain relational expression; the neural network method is to establish a model for the lithium battery by using a neural network and carry out sample training and learning; the ampere-hour integration method is to obtain the electric quantity at any moment by utilizing the integration of charge and discharge current to time; the Kalman method is used for predicting the current value and the next moment value of the SOC of the lithium battery by utilizing a signal processing method and the spatial state of a signal. Methods are numerous, but all have difficulties, and most rely on experimentation to obtain data. Because the design is not tested, the working voltage U of the lithium battery is obtained by looking up a large number of papers for researching the charging and discharging characteristics of the lithium battery_LRelation to SOC.

TABLE 5-1 lithium cell Voltage and SOC relation Table

The above table lists only SOC values divided in units of 0.05. In order to visually recognize the voltage variation trend, the SOC value is divided in a unit of 0.01 in fig. 5.

According to the formula, the working voltage of the lithium battery can be obtained, the charging current of the lithium battery is 50.4A, and the relation between the power of the lithium battery and the SOC can be obtained according to the value of P & ltUI & gt.

The battery SOC, capacity, load power, operating time, voltage satisfy the following equations.

In the above formula:

q-is the storage battery energy in kWh;

p is the load of the yacht system per hour, and the unit is kW/h;

t is the usable time of the storage battery and the unit h;

c-is the storage battery capacity, unit Ah;

u-is the working voltage of the storage battery pack, and the unit is V;

according to the above table 5-1, when the SOC is equal to 0.6, the corresponding operating voltage is 314.40V. At the moment, the storage battery supplies power to each device of the yacht, the power per hour of the load is 6.46kW, and the power generation system generates 1.1kW of power per hour to the storage battery until the storage battery is dead, namely the SOC is 0. As the SOC is continuously reduced and the corresponding working voltage is also reduced, the endurance is calculated according to the formula and is the lowest endurance.

When the SOC slowly decreased in the first stage and was less than 0.6, C was 504Ah and the load was 6.46 kW/h. According to the above formulas 5-2 and 5-3:

as the second stage SOC continued to decrease and was below 0.6, C was 504Ah and the load was 5.36 kW/h. According to the above formulas 5-2 and 5-3:

in summary, in the battery powered mode, the system endurance is 7.28 hours.

Hybrid power supply mode

The condition for triggering the hybrid powering mode is that the yacht demanded power and the propulsion power are greater than zero. And the input and output power is adjusted following the value of the SOC. When the SOC is greater than 0.8, the load consumes 106.46kW per hour, and receives 1.1kW per hour of solar and wind power generation, and the net output is 105.36kW per hour.

From the above table 5-1, it is understood that the corresponding operating voltage U is 326.34V when the SOC is 0.8. As the SOC is continuously reduced and the corresponding working voltage is also reduced, the endurance is calculated according to the formula and is the lowest endurance. C is 504Ah, and the load is 105.36 kW/h. According to the above formulas 5-2 and 5-3:

when the SOC value continues to decrease until the optimum SOC is 0.6, the corresponding operating voltage is 314.40V. The diesel oil power generation and the storage battery at the stage are both supplied by the system. Considering the principle that a power following strategy pursues the SOC balance to the optimal SOC, the storage battery consumes more power as much as possible, and the diesel engine generates less power properly. The power supply of the diesel engine is 20kW per hour, the power consumption of a load is 106.46kW per hour, the power generation of solar energy and wind energy is received, the power generation is 1.1kW per hour, and the net output is 85.36kW per hour. Thus t was 1.06 hours.

When the SOC value is reduced to the lower SOC safety limit, namely 0.4, the corresponding working voltage is 302.84V. In the stage, the diesel power generation and the storage battery are both system power supply, and the diesel engine also supplies power to the storage battery, so that the SOC reaches the SOC. The power supply of the diesel engine per hour is 30kW, the load power consumption is 106.46kW per hour, the power generation of solar energy and wind energy is received, the power generation per hour is 1.1kW, and the net output is 75.36kW per hour. Thus t was 1.13 hours.

Summarizing, the endurance of the system can reach 3.31 hours in the hybrid power supply mode.

Diesel generating mode

The triggering condition of the diesel power generation mode is that the yacht required power is larger than zero, the propelling power is larger than zero, and the SOC value of the storage battery is smaller than the set safety lower limit. At the moment, all the required power of the yacht is the sum of the propelling power and the power of other equipment. The sailing speed of the yacht is also reduced properly and is at the economic sailing speed of 8 knots. The electricity consumption on the yacht is 100kW for the propulsion equipment and is about three hours, and the electricity consumption of the non-propulsion equipment is 6.46kW per hour, and the total is 106.46kW per hour. At this time, the remaining capacity of the storage battery is 201.6Ah, and the electric generator also needs to supplement the electric quantity. The power of the diesel generating set is 30 kW. It is expected that 0.28 hour may be used. The mode is an excess state, and when the subsequent SOC is reduced to 0, the diesel emergency starting mode is entered to meet the requirement of propulsion power.

Shore power mode

In the shore power mode, a shore-based power supply charges a system storage battery. Assuming that the battery SOC is at a low value and the total battery capacity is 504Ah, the shore power charging voltage and current are differentiated according to the wharf, and typically, the shore power supply socket has 50Hz, 220V or 380V. The charging time in the shore power mode is about 2.52 hours to 6.3 hours, as seen from the fact that the charging current is 80A to 200A at 220VAC for this design. The quick charging can affect the service life of the storage battery, and the moderate charging current is selected as much as possible to charge the storage battery.

Diesel emergency launch mode

And when the power required by the yacht is not zero, the propelling power is not zero, the SOC is zero or the yacht is in a fault condition, entering a diesel emergency starting mode. The diesel engine is used as a main engine to drive the propeller to propel. The output power of the diesel engine is 30 kW. At economy speed operation, the main engine requires 21kW with some attendant yacht equipment power of 6.46kW per hour. Because the difference value between the output power of the diesel engine and the required power of the host and the yacht equipment is larger than zero, the diesel emergency power generation mode has no time limit and no endurance requirement, and the purpose of safe return is achieved.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims

1. The utility model provides a green energy system of new forms of energy yacht which characterized in that includes: the system comprises a solar power generation module, a wind power generation module, a diesel power generation module, a storage battery and an energy management module;

2. The green energy system of the new energy yacht of claim 1, wherein the power mode comprises:

3. The green energy system of the new energy yacht as claimed in claim 1, further comprising a shore power interface electrically connected to the storage battery, the storage battery being charged by an onshore power source.

4. The intelligent networked new energy yacht green energy system as claimed in claim 1, further comprising a communication module, wherein the communication module is connected with the outside through a wireless network.

5. The intelligent networked new energy yacht green energy system of claim 1, wherein the solar power generation module comprises: the solar energy storage system comprises a photovoltaic module, a solar storage battery, a controller and an inverter;

6. The intelligent networked new energy yacht green energy system as claimed in claim 1, wherein the wind power generation module comprises: the system comprises a wind driven generator, a wind power storage battery, a controller and an inverter;

7. The intelligent networked new energy yacht green energy system of claim 1, wherein the energy management module monitors the solar power generation module, the wind power generation module, the diesel power generation module and the electrical equipment in real time via a CAN bus.

8. The intelligent networked new energy yacht green energy system as claimed in claim 1, wherein the operating conditions comprise: navigation working condition, floating stopping working condition, parking working condition and emergency working condition.

9. The intelligent networked new energy yacht green energy system of claim 1, wherein the diesel power generation module comprises a generator operating condition and a host operating condition;

10. The energy matching management method for the green energy system of the new energy yacht, as claimed in claim 1, comprises:

step S2, judging whether the propeller power is 0;

step S4, in the state that the judgment result of step S2 is not 0, whether the SOC value of the storage battery is larger than the upper limit value of the SOC of the storage battery is judged, if so, a hybrid power supply mode is entered, at the moment, the capacity of the storage battery is consumed to SOC, the diesel generator is temporarily in standby, the storage battery mainly generates power, meanwhile, the solar power generation module and the wind power generation module charge the storage battery through the DC/DC converter and the AC/DC converter, and the SOC of the storage battery is continuously reduced at the stage until the SOC is smaller than the upper limit value of the SOC, and the step S5 is entered;

and step S6, judging whether the SOC value of the storage battery is larger than the optimal SOC value, if so, adopting a hybrid power supply mode, at the moment, needing the storage battery to discharge part of electricity to reach the SOC, wherein the power required by the yacht system is the sum of the output power of the diesel generator and the output power of the storage battery, meanwhile, the solar power generation module and the wind power generation module supply power to the storage battery, if the SOC is lower than the SOC, the solar power generation module and the wind power generation module mainly use diesel power generation, the power required by the yacht is the sum of the output power of the diesel generator and the output power of the storage battery, and the solar power generation module and the wind power generation.