CN110048410A - Realize the frequency conversion load control method of network of ship stable operation - Google Patents

Realize the frequency conversion load control method of network of ship stable operation Download PDF

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Publication number
CN110048410A
CN110048410A CN201910323402.8A CN201910323402A CN110048410A CN 110048410 A CN110048410 A CN 110048410A CN 201910323402 A CN201910323402 A CN 201910323402A CN 110048410 A CN110048410 A CN 110048410A
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power
load
unit
net
currently
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CN110048410B (en
Inventor
王刚毅
丁虎
殷非
石磊
程武
倪凤燕
张元玮
曾志林
庄加兴
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Shanghai Csic Ship Propulsion Equipment Co ltd
704th Research Institute of CSIC
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704th Research Institute of CSIC
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/003—Load forecast, e.g. methods or systems for forecasting future load demand
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

Abstract

The present invention relates to a kind of frequency conversion load control methods for realizing network of ship stable operation; with the load control function based on electric network state; it can be realized the accurate Quick Acquisition of the "on" position signal to unit each on power grid, pre- shutdown status signal, frequency signal and power signal; and it is loaded and is controlled according to frequency conversion; the permissible load for calculating bearing power limit value and power grid based on power grid in real time increases slope; and then the power command from command device is combined, control frequency conversion loads real-time output power.Frequency conversion load control method timeliness of the invention is strong, biggish power can be generated to avoid power grid, and perhaps frequency fluctuation avoids power grid from generating power or frequency out-of-limit, improves the service life of unit, the safe and stable operation for realizing power grid, to guarantee the safe operation of each electrical equipment on ship.

Description

Realize the frequency conversion load control method of network of ship stable operation
Technical field
The present invention relates to a kind of Ship automatic technique, in particular to a kind of frequency conversion for realizing network of ship stable operation is negative Carry control method.
Background technique
With the development of frequency control and automatic technology, because having starting current small, energy efficiency is high for frequency conversion load, adjusts The advantages that fast process is fast, range is wide, precision is high, and space layout is flexible is widely used, propeller, strand on ship The equipment such as vehicle, compressor use frequency converter to be driven more and more.
But network of ship is different from land power grid, and network of ship is often generated electricity with boat-carrying prime mover group, network of ship Capacity is smaller for high-power frequency conversion load, therefore frequency conversion load control system should have the load based on electric network state Control function is loaded according to electric network state real-time control frequency conversion, is avoided power grid from generating power or frequency out-of-limit, is also avoided power grid Biggish power or frequency fluctuation are generated, the service life of unit is improved, realizes the safe and stable operation of power grid, to guarantee The safe operation of each electrical equipment on ship.
Frequency conversion load control system some currently on the market does not have the load control function based on electric network state, has Although having the load control function based on electric network state, have the disadvantage that:
1, the signal acquisition for detecting electric network state is not rapid enough.
2, it when the unit load rate on network segment of powering is higher, threads off extremely in case of unit, frequency conversion load control system System cannot reduce rapidly the power of frequency conversion load to protect power grid operation.
3, the load control method timeliness based on electric network state is weak, precisely cannot rapidly control the power of frequency conversion load Increase slope and output power, power grid even results in power under serious conditions there may be biggish power or frequency fluctuation Or frequency out-of-limit.
Summary of the invention
The present invention be directed to present frequency conversion load control system there are the problem of, propose a kind of realization network of ship and stablize The frequency conversion load control method of operation, timeliness is strong, improves the service life of unit, realizes the safe and stable operation of power grid, from And guarantee the safe operation of each electrical equipment on ship.
The technical solution of the present invention is as follows: a kind of frequency conversion load control method for realizing network of ship stable operation, digital quantity Acquisition module acquires the unit "on" position and the pre- shutdown status signal of unit of each unit in real time, and is sent by communication bus To frequency conversion load control system controller；Analogue collection module acquires each power of the assembling unit letter of each electric parameters transducer output Number and unit frequency signal, and be sent to by communication bus the controller of frequency conversion load control system；It is arranged in touch screen The following parameter of frequency conversion load control system: mains frequency lower limit value FL, the low lower limit value F of mains frequencyLL, mains frequency lower bound- Power limit PL, mains frequency lower bound-power limit PLL, each unit rated power, each power of the assembling unit limit coefficient, respectively A unit first order load coefficient, each unit second level load coefficient, each unit first order load slope, each two stage load of unit Slope, each three stage load slope of unit, the rated power P of frequency conversion loadRATE, and frequency conversion load is sent to by communication bus Control system controller；Command device receives the control instruction from operator or external system, and items control is referred to Order is sent to frequency conversion load control system controller；Frequency conversion load control system is according to status signal, parameter and control instruction, meter The permissible load for calculating real-time target bearing power and power grid increases slope, if load target power PGOALNo more than present load Power PACTIncrease the sum of slope with the permissible load of power grid, then loads real-time output power POUTEqual to load target power PGOAL, otherwise load real-time output power POUTEqual to present load power PACTIncrease slope △ P with the permissible load of power gridNET The sum of, with load target power PGOALIn smaller, gained frequency conversion load real-time output power POUTOutput extremely load frequency conversion Device, real-time perfoming frequency conversion load control.
The targeted loads power PGOALCalculation method is as follows:
1) all unit serial numbers for being in "on" position in power grid and being not at pre- shutdown status are searched, this state unit is Currently in net unit；
2) it calculates frequency and limits maximum load power PF: judge all currently whether there is frequency in net unit lower than power grid The low lower limit value F of frequencyLLUnit, if it is present frequency limit maximum load power PFIt is set as PLL, if it does not, continuing Judge all currently whether there is frequency in net unit lower than mains frequency lower limit value FLUnit, if it is present frequency limit Fixed load maximum power PFIt is set as PL, otherwise frequency limits maximum load power PFIt is set as the rated power P of frequency conversion loadRATE；
3) it calculates currently in net general power PNET: currently net general power be it is all currently the current power of net unit it With i.e. PNET=∑ Pi, PiFor i-th currently in net unit current power；
4) it calculates currently in net unit for maximum power PMAX: it is currently in step 1 for maximum power in net unit The sum of effectively usable power of all units found out, effectively usable power are that the rated power of unit is limited with the corresponding power of the assembling unit The product of coefficient processed, i.e. PMAX=∑ (PEi*fi), wherein PEiFor i-th currently in net unit rated power, fiCurrently exist for i-th Net power of the assembling unit limit coefficient；
5) power grid available power allowance P is calculatedMARGIN: power grid available power allowance is currently in net unit for maximum work Rate and currently in the difference of net general power, i.e. PMARGIN=PMAX-PNET；
6) the bearing power limit value P based on power grid is calculatedLIMIT: the bearing power limit value P based on power gridLIMITTake current change Frequency bearing power PACTWith power grid available power allowance PMARGINThe sum of, maximum load power P is limited with frequencyFIn smaller, That is PLIMIT=min { (PACT+PMARGIN), PF}；
7) targeted loads power P is calculatedGOAL: targeted loads power PGOALTake the bearing power limit value P based on power gridLIMITWith Power command P from command device 6INIn smaller, i.e. PGOAL=min { PLIMIT, PIN}。
It is as follows that the permissible load of the power grid increases slope calculation method:
A: it searches and is in "on" position G in power gridON=1 and it is not at pre- shutdown status GSTOP=0 all unit serial numbers, This state unit is currently in net unit；
B: calculate all currently in net unit load rate: i-th currently in net unit load rate LiCurrently exist equal to i-th Net unit current power GPWRiWith i-th currently in net unit rated power PEiRatio, i.e. Li=GPWRi/PEi；
C: calculate it is all currently net unit permissible load increase slope: if i-th currently in net unit load rate LiNo more than the first order load coefficient L of the unitIi, then i-th currently increases slope K in the permissible load of net unitiIt is i-th Currently in the first order load slope M of net unitIi；If i-th currently in net unit load rate LiLevel-one in the unit is negative Lotus coefficient LIiWith second level load coefficient LIIiBetween, i.e. LIi<Li<LIIi, then i-th currently increases tiltedly in the permissible load of net unit Rate KiFor i-th currently in two stage load slope M of net unitIIi；If i-th currently in net unit load rate LiNot less than this The second level load coefficient L of unitIIi, then i-th currently increases slope K in the permissible load of net unitiFor i-th currently in net Three stage load slope M of unitIIIi；
D: the permissible load for calculating power grid increases slope △ PNET: the permissible load of power grid increases slope △ PNETEqual to current Increase slope K with corresponding permissible load netting each unit rated poweriThe sum of product, i.e. △ PNET=∑ PEi*Ki。
The beneficial effects of the present invention are: the present invention realizes the frequency conversion load control method of network of ship stable operation, tool There is the load control function based on electric network state, can be realized the "on" position signal to unit each on power grid, pre- shutdown status The accurate Quick Acquisition of signal, frequency signal and power signal, and loaded and controlled according to frequency conversion, it calculates in real time negative based on power grid The permissible load for carrying power limit and power grid increases slope, and then combines the power command from command device, and control frequency conversion is negative Carry real-time output power.Frequency conversion load control method timeliness of the invention is strong, can be generated to avoid power grid biggish power or Person's frequency fluctuation avoids power grid from generating power or frequency out-of-limit, improves the service life of unit, realize the safety and stability of power grid Operation, to guarantee the safe operation of each electrical equipment on ship.
Detailed description of the invention
Fig. 1 is the frequency conversion load control system overall construction drawing that the present invention realizes network of ship stable operation；
Fig. 2 is targeted loads power P of the inventionGOALCalculation flow chart；
Fig. 3 is the real-time output power P of load of the inventionOUTCalculation flow chart.
Specific embodiment
A kind of frequency conversion load control system overall construction drawing for realizing network of ship stable operation as shown in Figure 1, frequency conversion are negative Borne control system is negative by digital data acquisition module (DIU) 1, electric parameters transducer (MTR) 2, analogue collection module (AIU) 3, frequency conversion Borne control system controller (VCS_CPU) 4, touch screen (HMI) 5 and 6 six part of command device (CTL) composition.
Digital data acquisition module 1 acquires the unit "on" position G of each unit GN in real timeONWith the pre- shutdown status G of unitSTOP Signal, and frequency conversion load control system controller 4 is sent to by communication bus.
MRT-3F-215 type Multifunctional Transmitter of the electric parameters transducer 2 using DEIF brand, each acquisition of electric parameters transducer 2 The three-phase voltage and three-phase current signal of corresponding unit, the processing of electric parameters transducer 2 acquisition signal and the power signal for exporting unit GPWRWith frequency signal GFRE, 2 output signal of electric parameters transducer exported by Quick-type analog output channel to analog acquisition Module 3, to realize each power of the assembling unit signal GPWRWith each unit frequency signal GFREData Quick Acquisition, data acquisition time Less than 50ms.
Analogue collection module 3 acquires the power of the assembling unit signal G that each electric parameters transducer 2 exportsPWRWith unit frequency signal GFRE, and it is sent to by communication bus the controller 4 of frequency conversion load control system.
Touch screen 5 has parameter setting and status display function, and frequency conversion load control system is artificially arranged in touch screen 5 Following parameter: mains frequency lower limit value FL, the low lower limit value F of mains frequencyLL, mains frequency lower bound-power limit PL, power grid frequency Rate lower bound-power limit PLL, unit rated power PE, power of the assembling unit limit coefficient f, unit first order load coefficient LI, unit Second level load coefficient LII, unit first order load slope MI, two stage load slope M of unitII, three stage load slope M of unitIII, frequency conversion The rated power P of loadRAT, and frequency conversion load control system controller 4 is sent to by communication bus.It can be in touch screen 5 Show all system modes of frequency conversion load control system.
Command device 6 is the command input device of frequency conversion load, and command device 6 is received from operator or external system The control instruction of system, and every control instruction is sent to frequency conversion load control system controller 4.
Frequency conversion load control system controller 4 is the core of frequency conversion load control system, the control of frequency conversion load control system Device 4 collects the unit "on" position G from digital data acquisition module 1ONWith the pre- shutdown status G of unitSTOPSignal, acquisition come from The power of the assembling unit G of analogue collection module 3PWRWith unit frequency GFRESignal acquires the power command P from command device 6INLetter After number, according to the real-time output power P for the frequency conversion load control method calculating frequency conversion load for realizing network of ship stable operationOUT, And the real-time output power P for loading frequency conversionOUTIt exports to load inverter 7.
A kind of frequency conversion load control method for realizing network of ship stable operation, comprising: targeted loads power PGOALIt calculates Method and the real-time output power P of loadOUTCalculation method.Targeted loads power PGOALCalculation method refers to frequency conversion load control system System calculates the target function of frequency conversion load according to the power command that mains frequency, grid power allowance, command device 7 input in real time Rate value PGOAL.Load real-time output power POUTCalculation method refers to that frequency conversion load control system increases according to the load that power grid allows Long slope come calculate frequency conversion load real-time output power POUT。
Targeted loads power P as shown in Figure 2GOALCalculation flow chart, targeted loads power PGOALCalculation method is as follows:
Step 1: it searches and is in "on" position (G in power gridON=1) and it is not at pre- shutdown status (GSTOP=0) all Unit serial number, this state unit are currently in net unit.
Step 2: it calculates frequency and limits maximum load power PF.Judge all currently whether have frequency low in net unit In the low lower limit value F of mains frequencyLLUnit, if it is present frequency limit maximum load power PFIt is set as PLLIf do not deposited Continuing to judge all currently whether have frequency lower than mains frequency lower limit value F in net unitLUnit, if it is present Frequency limits maximum load power PFIt is set as PL, otherwise frequency limits maximum load power PFIt is set as the rated power of frequency conversion load PRATE。
Step 3: it calculates currently in net general power PNET.It is currently all currently in the current function of net unit in net general power The sum of rate, i.e. PNET=∑ Pi, PiFor i-th currently in net unit current power.
Step 4: it calculates currently in net unit for maximum power PMAX.It is currently step for maximum power in net unit The sum of effectively usable power of all units found out in one, effectively usable power are rated power and the corresponding unit function of unit The product of rate limit coefficient, i.e. PMAX=∑ (PEi*fi), wherein PEiFor i-th currently in net unit rated power, fiWork as i-th It is preceding in net power of the assembling unit limit coefficient.
Step 5: power grid available power allowance P is calculatedMARGIN.Power grid available power allowance is currently in net unit for most It is high-power and currently in the difference of net general power, i.e. PMARGIN=PMAX-PNET。
Step 6: the bearing power limit value P based on power grid is calculatedLIMIT.Bearing power limit value P based on power gridLIMITIt takes and works as Preceding frequency conversion bearing power PACTWith power grid available power allowance PMARGINThe sum of, maximum load power P is limited with frequencyFIn it is smaller Person, i.e. PLIMIT=min { (PACT+PMARGIN), PF}。
Step 7: targeted loads power P is calculatedGOAL.Targeted loads power PGOALTake the bearing power limit value based on power grid PLIMITWith the power command P from command device 6INIn smaller, i.e. PGOAL=min { PLIMIT, PIN}。
The real-time output power P of load as shown in Figure 3OUTCalculation flow chart loads real-time output power POUTCalculation method It is as follows:
Step 1: it searches and is in "on" position G in power gridON=1 and it is not at pre- shutdown status GSTOP=0 all units Serial number, this state unit are currently in net unit.
Step 2: it calculates all currently in net unit load rate.I-th currently in net unit load rate LiEqual to i-th Currently in net unit current power GPWRiWith i-th currently in net unit rated power PEiRatio, i.e. Li=GPWRi/PEi。
Step 3: it calculates all currently in the permissible load increase slope of net unit: if i-th currently negative in net unit Lotus rate LiNo more than the first order load coefficient L of the unitIi, then i-th currently increases slope K in the permissible load of net unitiFor I-th currently in the first order load slope M of net unitIi；If i-th currently in net unit load rate LiOne in the unit Stage load coefficient LIiWith second level load coefficient LIIiBetween, i.e. LIi<Li<LIIi, then i-th currently increases in the permissible load of net unit Add slope KiFor i-th currently in two stage load slope M of net unitIIi；If i-th currently in net unit load rate LiIt is not small In the second level load coefficient L of the unitIIi, then i-th currently increases slope K in the permissible load of net unitiIt is current for i-th In three stage load slope M of net unitIIIi。
Step 4: the permissible load for calculating power grid increases slope △ PNET.The permissible load of power grid increases slope △ PNETDeng Each unit rated power and corresponding permissible load increase slope K are being netted in currentlyiThe sum of product, i.e. △ PNET=∑ PEi*Ki。
Step 5: the real-time output power P of computational loadOUTIf: targeted loads power PGOALNo more than present load power PACTIncrease slope △ P with the permissible load of power gridNETThe sum of, then load real-time output power POUTEqual to targeted loads power PGOAL, otherwise load real-time output power POUTEqual to present load power PACTIncrease slope △ P with the permissible load of power gridNET The sum of, with targeted loads power PGOALIn smaller, i.e. POUT=min { (PACT+△PNET), PGOAL}。
Embodiment selects propeller to load as frequency conversion, and identical three units, unit setting ginseng are equipped in power grid Number is as follows: unit rated power PE=800KW, power of the assembling unit limit coefficient f=0.95, unit first order load coefficient LI=0.50, Unit second level load coefficient LII=0.85, unit first order load slope MI=0.275, two stage load slope M of unitII=0.150, Three stage load slope M of unitIII==0.080；System set-up parameters are as follows: mains frequency lower limit value FL=48Hz, mains frequency Low lower limit value FLL=46Hz, mains frequency lower bound power limit PL=300KW, mains frequency lower bound power limit PLL= 100KW, the rated power P of frequency conversion loadRATE=1000KW.Under current state, No. 1 unit and No. 2 units are in "on" position, No. 3 units are in gate-dividing state.No. 1 set state: frequency 49.96Hz, power 634KW, rate of load condensate 0.793 allow Load increases slope 0.150；No. 2 set states: frequency 49.95Hz, power 630KW, rate of load condensate 0.789 allow to bear Lotus increases slope 0.150.Therefore according to targeted loads power PGOALCalculation method: No. 1 and No. 2 units are in "on" position and not In pre- shutdown status, two unit frequencies are above unit lower frequency limit value 48Hz, and frequency limits maximum load power PFIt is set as The rated power 1000KW of frequency conversion load, currently in net general power PNETFor 1265KW, currently in net unit for maximum power PMAXFor 1520KW, power grid available power allowance PMARGINFor 255KW, the bearing power limit value P based on power gridLIMITFor 849KW, mesh Mark bearing power PGOALFor 849KW.According to the real-time output power P of loadOUTCalculation method: No. 1 and No. 2 units are in combined floodgate shape State and it is not at pre- shutdown status, No. 1 unit load rate is that 0.793, No. 2 unit load rates are 0.789, No. 1 unit and No. 2 machines It is 0.150 that the permissible load of group, which increases slope, and the permissible load of power grid increases slope △ PNETFor 240KW, load target power 849KW is greater than present load power 594KW and the permissible load of power grid increases the sum of slope 240KW, then loads real-time output work Rate POUTIncrease the sum of slope 834KW for the permissible load of present load power and power grid.

Claims (3)

1. a kind of frequency conversion load control method for realizing network of ship stable operation, which is characterized in that digital data acquisition module is real When acquire the unit "on" position and the pre- shutdown status signal of unit of each unit, and frequency conversion load is sent to by communication bus Control system controller；Analogue collection module acquires each power of the assembling unit signal and unit frequency of each electric parameters transducer output Rate signal, and it is sent to by communication bus the controller of frequency conversion load control system；Frequency conversion is set in touch screen and loads control The following parameter of system processed: mains frequency lower limit value FL, the low lower limit value F of mains frequencyLL, mains frequency lower bound-power limit PL, Mains frequency lower bound-power limit PLL, each unit rated power, each power of the assembling unit limit coefficient, each unit level-one Load coefficient, each unit second level load coefficient, each unit first order load slope, each two stage load slope of unit are each Three stage load slope of unit, the rated power P of frequency conversion loadRATE, and frequency conversion load control system is sent to by communication bus Controller；Command device receives the control instruction from operator or external system, and every control instruction is sent to Frequency conversion load control system controller；Frequency conversion load control system calculates real-time mesh according to status signal, parameter and control instruction The permissible load for marking bearing power and power grid increases slope, if load target power PGOALNo more than present load power PACT Increase the sum of slope with the permissible load of power grid, then loads real-time output power POUTEqual to load target power PGOAL, otherwise bear Carry real-time output power POUTEqual to present load power PACTIncrease slope △ P with the permissible load of power gridNETThe sum of, with load Target power PGOALIn smaller, gained frequency conversion load real-time output power POUTIt exports to load inverter, real-time perfoming Frequency conversion load control.
2. realizing the frequency conversion load control method of network of ship stable operation according to claim 1, which is characterized in that described Targeted loads power PGOALCalculation method is as follows:
1) all unit serial numbers for being in "on" position in power grid and being not at pre- shutdown status are searched, this state unit is current In net unit；
2) it calculates frequency and limits maximum load power PF: judge all currently whether there is frequency in net unit lower than mains frequency Low lower limit value FLLUnit, if it is present frequency limit maximum load power PFIt is set as PLL, if it does not, continuing to judge It is all currently whether to have frequency lower than mains frequency lower limit value F in net unitLUnit, if it is present frequency limit it is negative Carry maximum power PFIt is set as PL, otherwise frequency limits maximum load power PFIt is set as the rated power P of frequency conversion loadRATE；
3) it calculates currently in net general power PNET: currently net general power be it is all currently in the sum of the current power of net unit, i.e., PNET=∑ Pi, PiFor i-th currently in net unit current power；
4) it calculates currently in net unit for maximum power PMAX: it is currently to be searched in step 1 for maximum power in net unit The sum of effectively usable power of all units out, effectively usable power are that the rated power of unit limits system with the corresponding power of the assembling unit The product of number, i.e. PMAX=∑ (PEi*fi), wherein PEiFor i-th currently in net unit rated power, fiFor i-th currently in net machine Group power limit coefficient；
5) power grid available power allowance P is calculatedMARGIN: power grid available power allowance be currently net unit for maximum power with Currently in the difference of net general power, i.e. PMARGIN=PMAX-PNET；
6) the bearing power limit value P based on power grid is calculatedLIMIT: the bearing power limit value P based on power gridLIMITCurrent frequency conversion is taken to load Power PACTWith power grid available power allowance PMARGINThe sum of, maximum load power P is limited with frequencyFIn smaller, i.e. PLIMIT =min { (PACT+PMARGIN), PF}；
7) targeted loads power P is calculatedGOAL: targeted loads power PGOALTake the bearing power limit value P based on power gridLIMITWith come from The power command P of command device 6INIn smaller, i.e. PGOAL=min { PLIMIT, PIN}。
3. realizing the frequency conversion load control method of network of ship stable operation according to claim 1, which is characterized in that described It is as follows that the permissible load of power grid increases slope calculation method:
A: it searches and is in "on" position G in power gridON=1 and it is not at pre- shutdown status GSTOP=0 all unit serial numbers, this shape State unit is currently in net unit；
B: calculate all currently in net unit load rate: i-th currently in net unit load rate LiEqual to i-th currently in net machine Group current power GPWRiWith i-th currently in net unit rated power PEiRatio, i.e. Li=GPWRi/PEi；
C: calculate it is all currently net unit permissible load increase slope: if i-th currently in net unit load rate LiLess In the first order load coefficient L of the unitIi, then i-th currently increases slope K in the permissible load of net unitiCurrently exist for i-th The first order load slope M of net unitIi；If i-th currently in net unit load rate LiFirst order load coefficient in the unit LIiWith second level load coefficient LIIiBetween, i.e. LIi<Li<LIIi, then i-th currently increases slope K in the permissible load of net unitiFor I-th currently in two stage load slope M of net unitIIi；If i-th currently in net unit load rate LiNot less than the unit Second level load coefficient LIIi, then i-th currently increases slope K in the permissible load of net unitiFor i-th currently in net unit Three stage load slope MIIIi；
D: the permissible load for calculating power grid increases slope △ PNET: the permissible load of power grid increases slope △ PNETEqual to currently in net Each unit rated power increases slope K with corresponding permissible loadiThe sum of product, i.e. △ PNET=∑ PEi*Ki。
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