CN110061527A - A kind of ship and bank electricity is grid-connected and the control method of seamless switching - Google Patents
A kind of ship and bank electricity is grid-connected and the control method of seamless switching Download PDFInfo
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- CN110061527A CN110061527A CN201910322815.4A CN201910322815A CN110061527A CN 110061527 A CN110061527 A CN 110061527A CN 201910322815 A CN201910322815 A CN 201910322815A CN 110061527 A CN110061527 A CN 110061527A
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- voltage
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- power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/44—Synchronising a generator for connection to a network or to another generator with means for ensuring correct phase sequence
Abstract
The present invention relates to a kind of ship and bank electricity is grid-connected and the control method of seamless switching, expectation voltage is obtained by electromagnetic torque Te direct compensation power, frequency is further controlled by the relationship of rotary inertia J and frequency response speed, along with the process of phase presynchronization, realizes grid-connected and seamless switching.The present invention has the advantages that detecting to obtain power and voltage by power and current detection means, three-phase voltage is calculated by three-phase alternating current calculating rule, bank electricity is as unlimited bulk power grid, power compensation can be carried out when the power detected is unsatisfactory for desired conditions, voltage and ship the expectation voltage-contrast frequency and phase obtained in the case, P-f control adjustment frequency is carried out first, phase locked adjustment is carried out when frequency phase, can be stable realization ship shore electric it is grid-connected, pass through the simulation of virtual synchronous generator property, the control of ship PMS can be passed through, enhance operability of the bank electricity on ship, reduce the probability of grid-connected failure.
Description
Technical field
The invention belongs to shipping shore power system technical field, in particular to a kind of ship and bank electricity is grid-connected and seamless switching
Control method.
Background technique
International community is increasingly stringent to Pollution From Ships object emission control standard, and ship, which reaches port, becomes control harbour using bank electricity
One of the important measures of ship discharge.Bank electricity technology, that is, ship peculiar to vessel stops using subsidiary engine during mooring wharf, and uses bank instead
Upper power supply power supply reduces environmental pollution and noise pollution that ship reaches port.
In order to which land power grid is attached with network of ship, need land 50Hz power supply, by commutation inversion, frequency conversion
Transformation becomes the power supply of the 60Hz that ship needs or 50Hz.Many scholars are proposed the relevant technologies and method, at present bank electricity electricity
Source is converted by power electronic devices, and the stability of the stability and seamless switching that control grid-connected inverters is poor,
Rush of current may be caused to network of ship and shipborne equipment in the case where not powering off grid-connected and switching, so that damage
Power equipment on ship.
At present in the method for ship shore electric control virtual synchronous generator control strategy and sagging control strategy both
Method is studied extensively by scholar.Liu Jinjun is in patent " a kind of grid-connected inverters control method based on virtual synchronous generator "
In, mainly use the control of the relationship of rotary inertia and angular frequency control output phase and reactive power；Xu Sheng is in " bank
Power supply is smoothly incorporated to the synchronisation control means of network of ship " in, using the two methods mentioned mainly by frequency
Control to frequency is realized in detection, is controlled using Q-U and P-f, using Same Way control simplify system control process and
Complexity.Both methods original is scholar for the control strategy for solving the proposition of new-energy grid-connected inverter, wherein added
The external characteristics of energy storage device simulation generator.But all think that a step realizes the control of voltage, frequency, phase in this use at two
System, control point are less, it is assumed that in the case of settling at one go, operator will be unable to interfere grid-connected process, cannot fully control electricity
Pressure, frequency, phase.It cannot be controlled completely by PMS system by studying discovery, the research that only design parameter is influenced,
Specific practical control process is not proposed.
Summary of the invention
There is frequency, phase presynchronization the technical problem to be solved in the present invention is to provide one kind and using virtual synchronous electromechanics
Magnetic torque and rotary inertia combine control ship and bank electricity is grid-connected and the control method of seamless switching, solve and close in the prior art
The problem of lacking is controlled in frequency, phase and voltage, is the problem of practical control problem is influenced rather than just research parameter.
In order to solve the above technical problems, the technical solution of the present invention is as follows: a kind of ship and bank electricity is grid-connected and seamless switching
Control method, innovative point are: the control method includes the following steps:
Step 1: the desired voltage U of network of ship is acquired by sampling apparatusrefAnd power Pref, while acquiring land power grid process
After transformer with network of ship tie point electric current i*And the power P of inverter output*；
Step 2: network of ship it is expected into power PrefWith the power P of inverter output*It makes the difference, error in judgement passes through electromagnetic torque
Compensation control the output power P of inverter*, until reaching desired power Pref；
Step 3: by the power P of obtained expectation inverterrefWith the electric current i of inverter output1 *It is calculated by AC power,
Obtain inverter output voltage U*；
Step 4: obtaining expectation voltage U using PLL phaselocked looprefWith inverter output voltage U*Phase and frequency；
Step 5: whether the frequency of the frequency and desired voltage that judge the voltage of inverter output is identical, needs when frequency does not wait
Give obtained frequency of modulated wave certain compensation, and observation inverter output voltage frequency reaches stable response speed, when
Response speed is excessively slow and fluctuates the larger control parameter rotary inertia J tune that can change in virtual synchronous generator control technology
Section；
Step 6: when detection frequency of modulated wave is equal with the frequency of desired voltage, then phase locked process can be carried out, it will
Wave phase is modulated, i.e. modulating wave makees poor, foundation difference according to the phase that network of ship voltage-phase carries out locking phase and desired voltage
Determine the size of phase compensation；
Step 7: the pulse that the frequency of modulating wave and phase modulating wave identical with desired voltage are obtained by SVPWM is to inversion
Device constitutes complete closed loop；
Step 8: the voltage that inverter is obtained and desired voltage-contrast judge whether voltage is equal, adjust electricity by transformer
Pressure, adjustment voltage is identical as desired voltage, then completes frequency, phase, the process of voltage synchronous；
Step 9: grid-connected movement is carried out, cuts off marine generator later, it is independently-powered using bank electricity；
Step 10: when switching over, generator adjusting being carried out by ship PMS system and meets grid-connected conditions.
Further, to the compensation that obtained frequency of modulated wave is certain in the step 5, frequency of modulated wave is according to ship electricity
What net voltage and frequency were controlled, compensation is the error of inverter output voltage frequency Yu network of ship frequency.
Further, grid-connected movement is specially that power grid 50Hz voltage in land is filled by transformation through over commutation in the step 9
It sets to obtain DC voltage, then obtains desired three-phase voltage by LCL filter structure by inverter, pass through potential device
Expectation voltage is obtained, bank electricity stake is connected to.
The present invention has the advantages that
(1) ship of the present invention and bank electricity is grid-connected and the control method of seamless switching, with the current theoretical conventional method phase proposed
Than more completely proposing the control process and method of each link, detecting to obtain function by power and current detection means
Three-phase voltage is calculated by three-phase alternating current calculating rule in rate and voltage, and bank electricity is as unlimited bulk power grid, when what is detected
Power can carry out power compensation, the voltage obtained in the case and ship expectation voltage-contrast frequency when being unsatisfactory for desired conditions
Rate and phase, first progress P-f control adjustment frequency, carry out phase locked adjustment when frequency phase, reach grid-connected
Condition, bank electricity system itself of the present invention constitute closed loop, can be stable realization ship shore electric it is grid-connected, generated electricity by virtual synchronous
The simulation of machine characteristic can enhance operability of the bank electricity on ship, reduce grid-connected failure by the control of ship PMS
Probability；
(2) ship of the present invention and bank electricity is grid-connected and the control method of seamless switching, during frequency adjustment, is utilized virtual
Synchronous generator power and simulation revolving speed, making frequency adjustment and feedback, with practical and desired difference power making frequency adjustment, benefit
With electric machine frequency speed control principle；
(3) ship of the present invention and bank electricity is grid-connected and the control method of seamless switching, uses inertial element to frequency response speed
Influence, by inertial element adjust frequency response process, enhance system response time, thus according to trigonometric function phase be frequency
Rate Integral Theory realizes phase locked process.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is that shipping shore power system is based on virtual synchronous generator techniques, power control, P/f control and phase in the present invention
The grid connected structure figure of position presynchronization.
Fig. 2 is that ship of the present invention and bank electricity be grid-connected and the control flow chart of seamless switching.
Fig. 3 is active power controller and compensation principle figure in the present invention.
Fig. 4 is that wave voltage control principle drawing is modulated in the present invention.
Fig. 5 is the control principle drawing that wave phase and desired phase presynchronization are modulated in the present invention.
Fig. 6 is the response diagram of controlling electromagnetic torque power in the present invention.
Fig. 7 is the response diagram of phase presynchronization process in the present invention.
Specific embodiment
The following examples can make professional and technical personnel that the present invention be more fully understood, but therefore not send out this
It is bright to be limited among the embodiment described range.
Embodiment
The present embodiment ship and bank electricity is grid-connected and the control method of seamless switching, as shown in Fig. 2, the control method includes such as
Lower step:
Step 1: the desired voltage U of network of ship is acquired by sampling apparatusrefAnd power Pref, while acquiring land power grid process
After transformer with network of ship tie point electric current i*And the power P of inverter output*；
Step 2: network of ship it is expected into power PrefWith the power P of inverter output*It makes the difference, error in judgement passes through electromagnetic torque
Compensation control the output power P of inverter*, until reaching desired power Pref；
Step 3: by the power P of obtained expectation inverterrefWith the electric current i of inverter output1 *It is calculated by AC power,
Obtain inverter output voltage U*；
Step 4: obtaining expectation voltage U using PLL phaselocked looprefWith inverter output voltage U*Phase and frequency；
Step 5: whether the frequency of the frequency and desired voltage that judge the voltage of inverter output is identical, needs when frequency does not wait
Give obtained frequency of modulated wave certain compensation, and observation inverter output voltage frequency reaches stable response speed, when
Response speed is excessively slow and fluctuates the larger control parameter rotary inertia J tune that can change in virtual synchronous generator control technology
Section；Wherein, frequency of modulated wave is controlled according to network of ship voltage and frequency, compensation be inverter output voltage frequency with
The error of network of ship frequency；
Step 6: when detection frequency of modulated wave is equal with the frequency of desired voltage, then phase locked process can be carried out, it will
Wave phase is modulated, i.e. modulating wave makees poor, foundation difference according to the phase that network of ship voltage-phase carries out locking phase and desired voltage
Determine the size of phase compensation；
Step 7: the pulse that the frequency of modulating wave and phase modulating wave identical with desired voltage are obtained by SVPWM is to inversion
Device constitutes complete closed loop；
Step 8: the voltage that inverter is obtained and desired voltage-contrast judge whether voltage is equal, adjust electricity by transformer
Pressure, adjustment voltage is identical as desired voltage, then completes frequency, phase, the process of voltage synchronous；
Step 9: carrying out grid-connected movement, i.e., as shown in Figure 1, land power grid 50Hz voltage obtains directly by transformation by fairing
Then galvanic electricity pressure obtains desired three-phase voltage by LCL filter structure by inverter, it is expected by potential device
Voltage is connected to bank electricity stake, cuts off marine generator later, independently-powered using bank electricity；
Step 10: when switching over, generator adjusting being carried out by ship PMS system and meets grid-connected conditions.
In embodiment, power control and compensation specifically, as shown in figure 3, Ship Power Station output power is expectation, reach permanent
The control process of power output, the Controlling model established by power P in synchronous generator and the mathematical relationship of electromagnetic torque Te are false
If ideally, wherein the electromagnetic torque Te moment changes, and needs to calculate the variation of Te by the ship PMS moment by leading to
News realize control of the ship to electromagnetic torque, achieve the purpose that control power.
As embodiment, more specific embodiment is modulation wave voltage, as shown in figure 4, passing through power and current detecting
Device obtains power P * and i and modulating wave can be obtained by three phase electric power calculation formula, and the pulse for generating inverter is believed
Number.
Frequency control, as shown in figure 5, it is similar with sagging control, but under the premise of the mathematical relationship of power and electromagnetic torque,
Obtain angular speed, compared with the desired angular speed of network of ship, obtain the actual angular speed of inverter output, by angular speed with
The transformation relation of frequency obtains the process that frequency f completes Frequency Synchronization, can pass through rotary inertia when frequency response is slow
J is adjusted；Secondly, phase locked process is carried out under conditions of completing Frequency Synchronization, according to phase, only in frequency
In the case where equal, just there is the meaning of adjusting, otherwise phase is meaningless adjusting.Modulating wave is to lead to desired voltage phase difference
Overcompensation, by the phase adjustment desired value of modulating wave.
Assuming that completing the process of all synchronizations, bank electricity itself constitutes closed loop, without using the data of Ship Power Station
Maintain the balance of system, meanwhile, the external characteristics of the synchronous generator of inverter simulation can realize ship by communication connection
Control of the oceangoing ship PMS to grid-connected inverters can disconnect the power supply of Ship Power Station with security and stability.
Ship is completed above by bank electricity voltage, frequency, phase locked process reach port berth using the grid-connected of bank electricity
Process, reality in the grid-connected requirement provided of ship be error be no more than 5%, the method theoretically can achieve wanting for simultaneous interconnecting
It asks.Complete it is grid-connected after, ship is left the post, and needs Ship Power Station grid-connected, and the off-grid process of bank electricity, Ship Power Station passes through ship
PMS system can directly control and network process, not complicated bank electricity control process, complete grid-connected bank electricity and network of ship and from
Network process is just fully completed.
Referring to Fig. 6, when carrying out frequency compensated response diagram by the method as shown, wherein load is resistive load
Verifying has carried out the experiment of this module, effect picture such as Fig. 6 by matlab/simulink emulation, but the precision compensated is not
It is that absolutely, but just within the scope of theoretical error, the method can make error smaller in contrast, be computed benefit
Repaying error is 0.15%.
It is the simulating, verifying figure of phase compensation referring to Fig. 7, by the way that the expectation phase and actual phase of ship is arranged, this
Place's setting actual phase is that 0rad is verified by this compensation method it is expected that phase is 30rad, can achieve the effect of compensation
Fruit.
Basic principles and main features and advantages of the present invention of the invention have been shown and described above.The skill of the industry
Art personnel it should be appreciated that the present invention is not limited to the above embodiments, the above embodiments and description only describe
The principle of the present invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these
Changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and
Its equivalent thereof.
Claims (3)
1. a kind of ship and bank electricity is grid-connected and the control method of seamless switching, it is characterised in that: the control method includes as follows
Step:
Step 1: the desired voltage U of network of ship is acquired by sampling apparatusrefAnd power Pref, while acquiring land power grid process
After transformer with network of ship tie point electric current i*And the power P of inverter output*；
Step 2: network of ship it is expected into power PrefWith the power P of inverter output*It makes the difference, error in judgement passes through electromagnetic torque
Compensation control the output power P of inverter*, until reaching desired power Pref；
Step 3: by the power P of obtained expectation inverterrefWith the electric current i of inverter output1 *It is calculated by AC power,
Obtain inverter output voltage U*；
Step 4: obtaining expectation voltage U using PLL phaselocked looprefWith inverter output voltage U*Phase and frequency；
Step 5: whether the frequency of the frequency and desired voltage that judge the voltage of inverter output is identical, needs when frequency does not wait
Give obtained frequency of modulated wave certain compensation, and observation inverter output voltage frequency reaches stable response speed, when
Response speed is excessively slow and fluctuates the larger control parameter rotary inertia J tune that can change in virtual synchronous generator control technology
Section；
Step 6: when detection frequency of modulated wave is equal with the frequency of desired voltage, then phase locked process can be carried out, it will
Wave phase is modulated, i.e. modulating wave makees poor, foundation difference according to the phase that network of ship voltage-phase carries out locking phase and desired voltage
Determine the size of phase compensation；
Step 7: the pulse that the frequency of modulating wave and phase modulating wave identical with desired voltage are obtained by SVPWM is to inversion
Device constitutes complete closed loop；
Step 8: the voltage that inverter is obtained and desired voltage-contrast judge whether voltage is equal, adjust electricity by transformer
Pressure, adjustment voltage is identical as desired voltage, then completes frequency, phase, the process of voltage synchronous；
Step 9: grid-connected movement is carried out, cuts off marine generator later, it is independently-powered using bank electricity；
Step 10: when switching over, generator adjusting being carried out by ship PMS system and meets grid-connected conditions.
2. ship according to claim 1 and bank electricity is grid-connected and the control method of seamless switching, it is characterised in that: the step
To the compensation that obtained frequency of modulated wave is certain in rapid 5, frequency of modulated wave is controlled according to network of ship voltage and frequency,
Compensation is the error of inverter output voltage frequency Yu network of ship frequency.
3. ship according to claim 1 and bank electricity is grid-connected and the control method of seamless switching, it is characterised in that: the step
Grid-connected movement specially land power grid 50Hz voltage obtains DC voltage by fairing by transformation in rapid 9, then passes through
Inverter obtains desired three-phase voltage by LCL filter structure, obtains expectation voltage by potential device, is connected to bank electricity
Stake.
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| CN201910322815.4A CN110061527B (en) | 2019-04-22 | 2019-04-22 | Control method for ship and shore power grid connection and seamless switching |
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| CN201910322815.4A CN110061527B (en) | 2019-04-22 | 2019-04-22 | Control method for ship and shore power grid connection and seamless switching |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111463828A (en) * | 2020-04-24 | 2020-07-28 | 江苏科技大学 | Multisource capacity-increasing shore power system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104410097A (en) * | 2014-09-26 | 2015-03-11 | 广东易事特电源股份有限公司 | Microgrid inverter and grid-connected and off-grid control method thereof |
| CN104701886A (en) * | 2015-04-02 | 2015-06-10 | 国家电网公司 | Presynchronization control method based on virtual synchronous generator |
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- 2019-04-22 CN CN201910322815.4A patent/CN110061527B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104410097A (en) * | 2014-09-26 | 2015-03-11 | 广东易事特电源股份有限公司 | Microgrid inverter and grid-connected and off-grid control method thereof |
| CN104701886A (en) * | 2015-04-02 | 2015-06-10 | 国家电网公司 | Presynchronization control method based on virtual synchronous generator |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111463828A (en) * | 2020-04-24 | 2020-07-28 | 江苏科技大学 | Multisource capacity-increasing shore power system |
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