CN106356837B - A kind of energy-storage module automatic inflatable method for electrically for ship MVDC synthesis electrical method system - Google Patents
A kind of energy-storage module automatic inflatable method for electrically for ship MVDC synthesis electrical method system Download PDFInfo
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- CN106356837B CN106356837B CN201611040658.0A CN201611040658A CN106356837B CN 106356837 B CN106356837 B CN 106356837B CN 201611040658 A CN201611040658 A CN 201611040658A CN 106356837 B CN106356837 B CN 106356837B
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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Abstract
The present invention relates to a kind of energy-storage module automatic inflatable method for electrically for ship MVDC synthesis electrical method system.The present invention determines the state of energy-storage module charge and discharge according to DC bus-bar voltage threshold value, realizes the automatic inflatable Electricity Functional of energy-storage module by detection DC bus-bar voltage signal.The present invention only passes through detection DC bus-bar voltage signal, the state of energy-storage module charge and discharge is determined according to DC bus-bar voltage threshold value, it can not only realize the automatic inflatable Electricity Functional of energy-storage module, and it is able to solve the problem of needing to maintain stable DC bus-bar voltage in the operation of ship MVDC synthesis electrical method system, has the advantages that and module independent control low to communication requirement.
Description
Technical field
The present invention relates to a kind of energy-storage module automatic inflatable method for electrically for ship MVDC synthesis electrical method system.
Background technique
Ship MVDC synthesis electrical method system is the isolated power system of the more loads of multi-source, and system stable operation is
The premise of high quality electric energy and system safety operation, the stability of ship MVDC synthesis electrical method system are provided for power load
When referring to that modular power changes in system operation, DC bus-bar voltage is able to maintain or is restored to allowed band, keeps away
Exempt from the ability of system crash.The method of operation for how regulating and controlling multiple power generations, electricity consumption module, coordinates the energy flow between each module
To meet one of the key function that the targets such as system stable operation and economical operation are full electric power ship energy intelligent decision systems,
Especially system, which introduces, both can be used as electricity generation module and can also be used as the energy-storage module of load, so that the case where system more
Complexity, the stability and reliability of system operation can no doubt be improved by introducing energy-storage module, but its key problem is that design is effective
Energy-storage module automatic inflatable method for electrically.
Summary of the invention
The purpose of the present invention is to provide a kind of requirements for DC bus-bar voltage stability that meets system for ship
The energy-storage module automatic inflatable method for electrically of oceangoing ship MVDC synthesis electrical method system
The object of the present invention is achieved like this:
By detecting DC bus-bar voltage signal, the shape of energy-storage module charge and discharge is determined according to DC bus-bar voltage threshold value
State realizes the automatic inflatable Electricity Functional of energy-storage module, the state of energy-storage module charge and discharge is determined according to DC bus-bar voltage threshold value
Include:
Define DC bus-bar voltage degree of deviation ε:
Wherein, VdcFor DC bus-bar voltage measured value,For DC bus-bar voltage reference value；
According to the requirement of DC bus-bar voltage performance indicator, with | ε |=3% He | ε |=5%, for boundary, system is divided into
Following operating status:
State 1:| ε | < 3%, the loading demand in system are supplied by each generator unit, and in this state, electric generation management is logical
Cross the power-balance in the output power maintenance system for coordinating each generator unit；
State 2:3% < ε < 5%, at this timeShow to have superfluous power in system and only relies on power generation pipe
Reason is not enough to maintain DC bus-bar voltage within the specified scope, and energy-storage units charging is needed to absorb excessive power, energy storage management
By monitoring DC bus-bar voltage VdcValue and energy-storage units state-of-charge SOC, determine whether energy-storage units have ability ginseng
With DC bus-bar voltage adjust and if can if determine energy-storage units charging current value；
State 3:-5% < ε < -3%,Underpower in system needs energy-storage units to discharge defeated to system
For power to keep DC bus-bar voltage to balance, energy storage management passes through monitoring DC bus-bar voltage V outdcValue and energy-storage units lotus
Electricity condition SOC, determines whether energy-storage units have ability and participate in the electric discharge electricity that DC bus-bar voltage adjusts and determines energy-storage units
Flow valuve；
State 4:| ε | > 5%, electric generation management and energy storage management are not enough to maintain DC bus-bar voltage within the specified scope,
By increasing or decreasing load with balance system power.
Energy-storage module operates the short-term power swing of balance system by charge/discharge, is determined and is stored up using state-of-charge variable
The energy whether excessive charge/discharge of module, is arranged as SOC < 10%, energy-storage module over-discharge not can be carried out discharge operation；When
When SOC > 90%, energy-storage module overcharges, and not can be carried out charging operations, and the charge/discharge strategy of energy-storage module is divided into actively
Charging, active discharge, passive charging and four kinds of operational modes of passively discharging:
1) active charge: when the DC bus-bar voltage degree of deviation | ε | < 1% simultaneously keeps a period of time T, the charged shape of energy-storage module
When state SOC < 40%, active charge is carried out to energy-storage module, the state-of-charge SOC of energy-storage module will rise, when SOC numerical value reaches
50% or cause the DC bus-bar voltage degree of deviation | ε | when > 2%, stop active charge；
2) active discharge: when the DC bus-bar voltage degree of deviation | ε | < 1% simultaneously keeps a period of time, the charged shape of energy-storage module
When state SOC > 60%, energy-storage module is controlled to power grid active discharge, the state-of-charge SOC of energy-storage module will decline, when SOC numerical value
Reach 50% or cause the DC bus-bar voltage degree of deviation | ε | when > 2%, stop active discharge；
3) passive charging: as DC bus-bar voltage degree of deviation ε > 3%, energy-storage module state-of-charge SOC < 80%, control
Energy-storage module is passively charged, and the state-of-charge SOC of energy-storage module will rise, as | ε | < 1% and keep a period of time or
When SOC > 90%, stop passive charging；
4) passive electric discharge: when DC bus-bar voltage degree of deviation ε < -3%, energy-storage module state-of-charge SOC > 20%, control
Energy-storage module processed passively discharges to power grid, and the state-of-charge SOC of energy-storage module will decline, when | ε | < 1% is simultaneously kept for a period of time
Or stop passive electric discharge when SOC < 10%.
The active charge/discharge operation mode keeps the state-of-charge SOC of energy-storage module in specified level, passively
Charge/discharge operation mode maintains DC bus-bar voltage to stablize；It is right using constant current charge/discharge when energy-storage module active charge/discharge
DC bus-bar voltage does not cause to fluctuate；Constant pressure charge/discharge is used when the passive charge/discharge of energy-storage module, using double-closed-loop control, dimension
The power-balance in power grid is held, and then maintains stable busbar voltage；Limitation is added in electric current loop.
The beneficial effects of the present invention are:
Only by detection DC bus-bar voltage signal, the shape of energy-storage module charge and discharge is determined according to DC bus-bar voltage threshold value
State, can not only realize the automatic inflatable Electricity Functional of energy-storage module, and be able to solve ship MVDC synthesis electrical method system
The problem of needing to maintain stable DC bus-bar voltage in operation has the advantages that and module independent control low to communication requirement.
Detailed description of the invention
Fig. 1 ship MVDC synthesis electrical method system simplifies circuit；
Fig. 2 energy-storage module auto charge and discharge flow chart；
Fig. 3 energy-storage module constant current charge/discharge control block diagram；
Fig. 4 energy-storage module constant pressure charge/discharge control block diagram.
Specific embodiment
It illustrates with reference to the accompanying drawing and the present invention is described in more detail:
(1) according to the requirement of DC bus-bar voltage performance indicator, respectively with | ε |=3% He | ε |=5% is boundary, will be stored up
Energy module is divided into 4 operating statuses；
(2) by detection DC bus-bar voltage signal, energy-storage module carrying out practically is determined according to DC bus-bar voltage threshold value
State；
(3) energy-storage module operating status and state-of-charge are combined, the charge/discharge strategy of energy-storage module is subdivided into and is actively filled
Electricity, active discharge, passive charging and four kinds of operational modes of passively discharging；
(4) according to energy-storage module current operating conditions and charged current state, selection meets operational mode feature and operation
The automatic charge/discharge operational mode of condition.
There are also such Some features by the present invention:
(1) actively and passively the difference of charge/discharge is that the former purpose is to maintain the state-of-charge SOC of energy-storage module and exists
Suitable horizontal, the purpose of the latter is to maintain DC bus-bar voltage.
(2) when energy-storage module active charge/discharge, using constant current charge/discharge.
(3) constant pressure charge/discharge is used when the passive charge/discharge of energy-storage module, using double-closed-loop control, and to avoid the occurrence of
Limitation is added in electric current charge/discharge in electric current loop
In conjunction with Fig. 1, by MVDC distribution system, electricity generation module, energy-storage module are equivalent to ideal controlled DC voltage source, and
Load blocks then can be equivalent to DC current source.Assuming that ship port and starboard DC bus is connected to one by interconnection switch
It rises and forms a common DC bus, ignore the loss of transmission line, obtain ship MVDC synthesis electrical method system simplifies electricity
Road model.Wherein CbusFor the DC bus equivalent capacity that each converter DC bus capacitor is formed, IG=[IG1,IG2,IG3,IG4]T、
IES=[IES1]T、IL=[IPM1,IPM2,IPL,IL1,IL2,IL3]TThe respectively output electric current of electricity generation module and energy-storage module and negative
Carry the input current of module.
DC bus-bar voltage VdcIt can be by following differential equation:
When the electric current algebraical sum for being input to DC bus is greater than 0, i.e., the power that DC bus absorbs is greater than the power issued
When, DC bus-bar voltage rises；When being input to the electric current algebraical sum of DC bus less than 0, i.e., DC bus absorb power
Less than sending power when, DC bus-bar voltage decline." power generation-energy storage " energy can be used as by detection DC bus-bar voltage
The public adjustment signal of coordinated control adjusts the charging and discharging currents of power generation sub-system output electric current and energy-storage system, thus full
Sufficient DC bus-bar voltage operation is within the limits prescribed.
The performance indicator of ship MVDC synthesis electrical method system dc busbar voltage is as shown in table 1:
Define DC bus-bar voltage degree of deviation ε:
Wherein, VdcFor DC bus-bar voltage measured value,For DC bus-bar voltage reference value.
Requirement in conjunction with table 1 to DC bus-bar voltage performance indicator, the present invention is respectively with | ε |=3% He | ε | and=5% is
System is divided into following operating status by boundary:
State 1:| ε | < 3%, the loading demand in system are supplied by each generator unit, and in this state, electric generation management is logical
Cross the power-balance in the output power maintenance system for coordinating each generator unit；
State 2:3% < ε < 5%, at this timeShow to have superfluous power in system and only relies on power generation pipe
Reason is not enough to maintain DC bus-bar voltage within the specified scope, and energy-storage units charging is needed to absorb excessive power, energy storage management
By monitoring DC bus-bar voltage VdcValue and energy-storage units state-of-charge SOC, determine whether energy-storage units have ability ginseng
With DC bus-bar voltage adjust and if can if determine energy-storage units charging current value；
State 3:-5% < ε < -3%,Similar to state 2, underpower in system needs energy-storage units
It discharges to system output power to keep DC bus-bar voltage to balance, energy storage management passes through monitoring DC bus-bar voltage VdcValue and
The state-of-charge SOC of energy-storage units, determine energy-storage units whether have ability participate in DC bus-bar voltage adjust and if can
Then to determine the discharge current value of energy-storage units；
State 4:| ε | > 5%, electric generation management and energy storage management are not enough to maintain DC bus-bar voltage in prescribed limit at this time
It is interior, it needs by increasing or decreasing load with balance system power.
In conjunction with Fig. 2, energy-storage module auto charge and discharge flow chart is provided, details are as follows for energy storage subsystem charge and discharge strategy:
Energy-storage module operates the short-term power swing of balance system, in order to prevent excessive charge/discharge pair by charge/discharge
Energy-storage module service life adversely affects, and is determined and is stored up using state-of-charge (State of Charge, SOC) this variable
It can the whether excessive charge/discharge of module.The present invention is arranged as SOC < 10%, energy-storage module over-discharge, not can be carried out electric discharge behaviour
Make；As SOC > 90%, energy-storage module overcharges, and not can be carried out charging operations.In addition, it is contemplated that full electric power ship is being held
When row task, violent load fluctuation may occur at any time, the uncertainty with height, in order to avoid energy-storage module is excessive
The effect of charge/discharge disequilibrium system power, should make the SOC of energy-storage module be maintained at medium level, be the discharge/charge of energy-storage module
There are nargin for electric flux.
According to above-mentioned analysis, the charge/discharge strategy of energy-storage module is subdivided into active charge, active discharge, quilt by the present invention
Dynamic charging and passively four kinds of operational modes of electric discharge, detailed description are as follows for every kind of operational mode feature and operating condition:
1) active charge: when the DC bus-bar voltage degree of deviation | ε | < 1% simultaneously keeps a period of time, the charged shape of energy-storage module
When state SOC < 40%, active charge is carried out to energy-storage module, the state-of-charge SOC of energy-storage module will rise, when SOC numerical value reaches
50% or cause the DC bus-bar voltage degree of deviation | ε | when > 2%, stop active charge；
2) active discharge: when the DC bus-bar voltage degree of deviation | ε | < 1% simultaneously keeps a period of time, the charged shape of energy-storage module
When state SOC > 60%, energy-storage module is controlled to power grid active discharge, the state-of-charge SOC of energy-storage module will decline, when SOC numerical value
Reach 50% or cause the DC bus-bar voltage degree of deviation | ε | when > 2%, stop active discharge；
3) passive charging: as DC bus-bar voltage degree of deviation ε > 3%, energy-storage module state-of-charge SOC < 80%, control
Energy-storage module is passively charged, and the state-of-charge SOC of energy-storage module will rise, as | ε | < 1% and keep a period of time or
When SOC > 90%, stop passive charging；
4) passive electric discharge: when DC bus-bar voltage degree of deviation ε < -3%, energy-storage module state-of-charge SOC > 20%, control
Energy-storage module processed passively discharges to power grid, and the state-of-charge SOC of energy-storage module will decline, when | ε | < 1% is simultaneously kept for a period of time
Or stop passive electric discharge when SOC < 10%.
Constant pressure charge/discharge or constant current charge/discharge can be used when energy-storage module charge/discharge, in conjunction with Fig. 3 and Fig. 4, in detail below
Illustrate energy-storage module under different mode using charge/discharge by the way of and charge/discharge current calculating.
In conjunction with Fig. 3, when energy-storage module active charge/discharge, in order to guarantee not cause big ups and downs to DC bus-bar voltage, adopt
With constant current charge/discharge, whereinAnd IESRespectively indicate the reference value and practical charge/discharge of energy-storage module constant current charge/discharge current
The value of electric current, D are duty cycle signals.
For the reference value of charge/discharge current, it is contemplated that power generation sub-system exports the change rate of electric current by its generating set
The influence of Ramp Rate, therefore the charging and discharging currents of energy-storage moduleSelection should meet:
Wherein, IG,iIndicate the output electric current of generator unit.
In conjunction with Fig. 4, when energy-storage module passive charge/discharge, belongs to loose terminal, and the purpose is to maintain the power in power grid flat
Weighing apparatus, and then maintain stable busbar voltage, therefore constant pressure charge/discharge is used when the passive charge/discharge of energy-storage module, using two close cycles
Control, and to avoid the occurrence of overcurrent charge/discharge, limitation is added in electric current loop, whereinAnd VdcRespectively indicate direct current mother
The reference voltage and virtual voltage of line,WithThe bound of charge/discharge current is respectively indicated, other symbol meanings and Fig. 3
In it is consistent.
The purpose of the present invention is to provide a kind of energy-storage modules for ship MVDC synthesis electrical method system to fill automatically
Charging method determines energy-storage module charge and discharge according to DC bus-bar voltage threshold value only by detection DC bus-bar voltage signal
State, can not only realize the automatic inflatable Electricity Functional of energy-storage module, and be able to solve ship MVDC synthesis electrical method system
The problem of needing to maintain stable DC bus-bar voltage in system operation, has low to communication requirement and module independent control excellent
Point.
Claims (2)
1. a kind of energy-storage module automatic inflatable method for electrically for ship MVDC synthesis electrical method system, female by detection direct current
Line voltage signal determines the state of energy-storage module charge and discharge according to DC bus-bar voltage threshold value, realizes filling automatically for energy-storage module
Discharging function, which is characterized in that the state for determining energy-storage module charge and discharge according to DC bus-bar voltage threshold value includes:
Define DC bus-bar voltage degree of deviation ε:
Wherein, VdcFor DC bus-bar voltage measured value,For DC bus-bar voltage reference value；
According to the requirement of DC bus-bar voltage performance indicator, with | ε |=3% He | ε |=5%, for boundary, system is divided into following
Several operating statuses:
State 1:| ε | < 3%, the loading demand in system are supplied by each generator unit, and in this state, electric generation management passes through association
Adjust the power-balance in the output power maintenance system of each generator unit；
State 2:3% < ε < 5%, at this timeUnderpower in system needs energy-storage units to discharge and exports to system
For power to keep DC bus-bar voltage to balance, energy storage management passes through monitoring DC bus-bar voltage VdcValue and energy-storage units it is charged
State SOC, determines whether energy-storage units have ability participation DC bus-bar voltage and adjust and determine the discharge current of energy-storage units
Value；
Show underpower in system, energy-storage units needed to discharge to system output power to keep DC bus-bar voltage to balance,
Energy storage management passes through monitoring DC bus-bar voltage VdcValue and energy-storage units state-of-charge SOC, determine whether energy-storage units have
Standby ability participate in DC bus-bar voltage adjust and if can if determine the discharge current values of energy-storage units；
State 3:-5% < ε < -3%,Show to have superfluous power in system and only relies on electric generation management deficiency
To maintain DC bus-bar voltage within the specified scope, energy-storage units charging is needed to absorb excessive power, energy storage management passes through prison
Survey DC bus-bar voltage VdcValue and energy-storage units state-of-charge SOC, determine energy-storage units whether have ability participate in direct current
Varying DC link voltage and if can if determine energy-storage units charging current value；
State 4:| ε | > 5%, electric generation management and energy storage management are not enough to that DC bus-bar voltage is maintained to pass through within the specified scope
Load is increased or decreased with balance system power；
The energy-storage module operates the short-term power swing of balance system by charge/discharge, is determined using state-of-charge variable
The whether excessive charge/discharge of energy-storage module is arranged as SOC < 10%, and energy-storage module over-discharge not can be carried out discharge operation；When
When SOC > 90%, energy-storage module overcharges, and not can be carried out charging operations, and the charge/discharge strategy of energy-storage module is divided into actively
Charging, active discharge, passive charging and four kinds of operational modes of passively discharging:
1) active charge: when the DC bus-bar voltage degree of deviation | ε | < 1% simultaneously keeps a period of time T, energy-storage module state-of-charge
When SOC < 40%, active charge is carried out to energy-storage module, the state-of-charge SOC of energy-storage module will rise, when SOC numerical value reaches
50% or cause the DC bus-bar voltage degree of deviation | ε | when > 2%, stop active charge；
2) active discharge: when the DC bus-bar voltage degree of deviation | ε | < 1% simultaneously keeps a period of time, energy-storage module state-of-charge SOC
When > 60%, energy-storage module is controlled to power grid active discharge, the state-of-charge SOC of energy-storage module will decline, when SOC numerical value reaches
50% or cause the DC bus-bar voltage degree of deviation | ε | when > 2%, stop active discharge；
3) passive charging: when DC bus-bar voltage degree of deviation ε < -3%, energy-storage module state-of-charge SOC < 80%, control storage
Can module passively charged, the state-of-charge SOC of energy-storage module will rise, as | ε | < 1% and keep for a period of time or SOC >
When 90%, stop passive charging；
4) passive electric discharge: as DC bus-bar voltage degree of deviation ε > 3%, energy-storage module state-of-charge SOC > 20%, energy storage is controlled
Module is passively discharged to power grid, and the state-of-charge SOC of energy-storage module will decline, as | ε | < 1% and keep a period of time or SOC <
Stop passive electric discharge when 10%.
2. a kind of energy-storage module auto charge and discharge for ship MVDC synthesis electrical method system according to claim 1
Method, it is characterised in that:
The active charge/discharge operation mode keeps the state-of-charge SOC of energy-storage module in specified level, passive discharge/charge
Electrically operated mode maintains DC bus-bar voltage to stablize；When energy-storage module active charge/discharge, using constant current charge/discharge, to direct current mother
Line voltage does not cause to fluctuate；Constant pressure charge/discharge is used when the passive charge/discharge of energy-storage module, using double-closed-loop control, maintains power grid
Interior power-balance, and then maintain stable busbar voltage；Limitation is added in electric current loop.
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| CN115360686B (en) * | 2022-08-03 | 2024-07-12 | 北京能高自动化技术股份有限公司 | DC voltage stabilization and autonomous charge-discharge control method in DC micro-grid |
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