CN106533238A - Voltage compensation-based grid-connected inverter control method for marine electrical system - Google Patents

Voltage compensation-based grid-connected inverter control method for marine electrical system Download PDF

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Publication number
CN106533238A
CN106533238A CN201611128445.3A CN201611128445A CN106533238A CN 106533238 A CN106533238 A CN 106533238A CN 201611128445 A CN201611128445 A CN 201611128445A CN 106533238 A CN106533238 A CN 106533238A
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China
Prior art keywords
voltage
phase
ship
voltage signal
frequency
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Inventor
曹德光
王述成
杨东升
张化光
冯健
李希元
张克众
李锡忠
刘冰
徐恺妮
宋晨辉
马占超
刘桁宇
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State Grid Corp of China SGCC
State Grid Liaoning Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Liaoning Electric Power Co Ltd
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Priority to CN201611128445.3A priority Critical patent/CN106533238A/en
Publication of CN106533238A publication Critical patent/CN106533238A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H02M7/53873—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with digital control

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses a voltage compensation-based grid-connected inverter control method for a marine electrical system, and belongs to the field of a control method for a grid-connected inverter of a marine power grid. Extraction of positive and negative sequence voltage components is realized in three-phase voltage imbalance of the marine electrical system by an orthogonal signal generated by an orthogonal signal generator of a generalized integrator; meanwhile, a single synchronous coordinate system phase-locking ring is added after a positive sequence voltage signal; the output frequency can dynamically correct the resonant frequency of the generalized integrator, so as to realize self adaption between the resonant frequency of the generalized integrator and the frequency of the marine power grid; in addition, a voltage feedforward control method is adopted, compensation to a grid side imbalance voltage is realized, and anti-interference capability of the system on the power grid voltage distortion is improved; and when the marine power grid voltage is imbalanced, the output power fluctuation can be effectively suppressed, thereby ensuring the stable operation of a sensitive load of the marine electrical system.

Description

A kind of control method of the Electrical system for a ship combining inverter based on voltage compensation
Technical field：
The present invention relates to network of ship control method of grid-connected inverter field, and in particular to a kind of Electrical system for a ship is grid-connected When inverter control method.
Background technology：
Increasingly serious with the day by day exhausted of fossil energy, atmospheric pollution and Climatic issues, regenerative resource is opened Send out and utilize and receive more and more extensive attention.
And during ship berthing at harbour, using the powering mode of bank electricity, be prevention and cure of pollution during traditional ship reaches port with It is energy-saving, there is provided may.Bank electricity technology refers to ship when port and pier are stopped, and stops using marine auxiliary electromotor to supply Electricity, is used instead the shore electric power on port area harbour, the equipment on ship is powered by cable.And when using bank electricity, ship Oceangoing ship electrical system and net operation is always the difficult point during this and emphasis, if reason be and net operation not in time, it will Cause Electrical system for a ship to run in the case of high load capacity, the economy and unit durability of vessel motion can be had a strong impact on, Especially when three-phase imbalance situation occurs in line voltage, effective adverser control technology is needed so that electrical network energy Enough even runnings, so as to quality of power supply when ensureing that Electrical system for a ship is grid-connected and the stable operation of sensitive load.And in reality Using in, traditional PQ control technology of the ship used in grid-connected, be difficult to meet ship to motility during power switching, Reliability and security requirement.Accordingly, it would be desirable to the problems referred to above are solved by a kind of new adverser control technology.
The content of the invention：
In order to overcome the above-mentioned deficiencies of the prior art, the invention provides a kind of Electrical system for a ship based on voltage compensation The control method of combining inverter；When grid-connected, the positive and negative sequence voltage component metering method based on Generalized Integrator designed, and is drawn Enter novel broad sense integration phaselocked loop, realize to grid voltage amplitude, the quick detection of phase and frequency；Meanwhile, design one kind contains The PQ control methods of voltage compensation, are applied in the grid-connected adverser control technology of Electrical system for a ship, complete in network of ship Output during Voltage unbalance suppresses, so as to realize the stable operation of ship sensitive load, it is ensured that ship combining inverter Steady operation in the case of line voltage and frequency frequent fluctuation.
A kind of control method of the Electrical system for a ship combining inverter based on voltage compensation, comprising following step：
The topological structure of three-phase grid-connected inverter when step 1, structure ship are grid-connected；
Step 2, according to ship it is grid-connected when three-phase grid-connected inverter topological structure, the amplitude, phase place and frequency to line voltage Rate is detected that positive-negative sequence component of voltage under two phase coordinate system of acquisition network of ship voltage is specific as follows：
Three-phase voltage signal is carried out CLARK conversion, obtains α β biphase by three-phase voltage signal in step 2-1, collection electrical network Voltage signal；
Step 2-2, the two-phase voltage signal to obtaining are integrated process, obtain the positive alternating current of 90 ° of phase place mutual deviation respectively Pressure signal；
Step 2-3, PI controls are carried out to the quadrature voltage signal under two phase coordinate systems by single synchronous coordinate system phaselocked loop Adjust, the amplitude of quadrature voltage signal, phase and frequency after being adjusted；
Step 2-4, the quadrature voltage signal of acquisition is carried out positive-negative sequence voltage calculating, obtain the biphase seat of network of ship voltage The lower positive-negative sequence component of voltage of mark system；
Positive-negative sequence component of voltage under step 3, two phase coordinate systems of α β for obtaining step 2 carries out dq coordinate transforms, passes through Second-order low-pass filter obtains the positive-negative sequence voltage signal of low frequency；
Step 4, the positive-negative sequence component of voltage of the low frequency of acquisition is carried out voltage unbalance factor calculating, obtain Voltage unbalance Degree；
Step 5, the voltage unbalance factor of acquisition and given voltage unbalance factor are carried out differing from process, using PI controls Method obtains voltage feedback factor；
Step 6, the Voltage loop given the voltage feedback factor of acquisition in Electrical system for a ship PI control units, realize To voltage compensation during Electrical system for a ship Voltage unbalance.
The two-phase voltage signal to acquisition described in step 2-2 is integrated process, specially：Using based on improper integral The orthogonal signal generator of device, carries out delayed 90 ° of phase place respectively to positive-negative sequence component of voltage under two phase coordinate system of line voltage Migration processing；
The transmission function of the Generalized Integrator, concrete formula are as follows：
Wherein, D (s) represents the transmission function of the orthogonal signal generator output voltage signal U ' based on Generalized Integrator, U For the ac voltage signal of input, U ' is the voltage signal that the orthogonal signal generator based on Generalized Integrator is exported, and k just represents The damped coefficient of signal generator, ω ' is handed over to represent the resonant frequency of orthogonal signal generator, Q (s) is represented based on Generalized Integrator Orthogonal signal generator output voltage signal qU ' transmission function, qU ' for 90 ° of delayed U ' voltage signals output voltage believe Number,Represent integral unit；
Described Generalized Integrator, the magnitude relation of its input and output voltage signal, concrete formula are as follows：
Wherein, frequencies of the ω for input voltage signal U, Q2Represent the amplitude change of Generalized Integrator output U ' voltage signals Amount, D2Represent that Generalized Integrator exports the amplitude variable quantity of qU ' voltage signals, ∠ D represent Generalized Integrator output U ' voltage letters Number phase angle, ∠ Q represent Generalized Integrator export qU ' signals phase angle.
PI is carried out to the quadrature voltage signal under two phase coordinate systems by single synchronous coordinate system phaselocked loop described in step 2-3 Control and regulation, after being adjusted, the amplitude of quadrature voltage signal, phase and frequency, specific as follows：
Step 2-4-1, the voltage signal under two phase coordinate systems of α β is converted into into the voltage signal under dq coordinate systems；
Step 2-4-2, the voltage signal under dq coordinate systems is adjusted using PI control methods, makes positive sequence voltage signal Amplitude levels off to 0, the frequency after being adjusted, and angular frequency of the frequency with setting is overlapped, and obtains single synchronous coordinate system The output frequency of phaselocked loop, using the frequency as Generalized Integrator in step 2-2 resonant frequency；
The frequency of step 2-4-3, the resonant frequency for judging Generalized Integrator and network of ship three-phase voltage signal whether phase Deng if so, then Electrical system for a ship is stable, without the need for amendment；Otherwise, by the resonant frequency of Generalized Integrator and network of ship three-phase The frequency of voltage signal is compared, and obtains compensation dosage, the compensation dosage is fed back in phaselocked loop PI control units, Generalized Product is made Divide the resonant frequency of device equal with the frequency of network of ship three-phase voltage signal.
Advantage of the present invention：
The more existing skill of control method of the heretofore described Electrical system for a ship combining inverter based on voltage compensation Art, has the advantage that：
Orthogonal signalling are produced using the orthogonal signal generator of Generalized Integrator and realizes Electrical system for a ship three-phase voltage not Positive-negative sequence component of voltage during balance is extracted, while single synchronous coordinate system phaselocked loop is added after positive sequence voltage signal, output frequency Rate can be with dynamic corrections based on the orthogonal signal generator of Generalized Integrator resonant frequency, realize based on Generalized Integrator just The resonant frequency of friendship signal generator and the self adaptation of network of ship frequency, the control method of applied voltage feedforward, it is right to realize The compensation of net side unbalance voltage, enhances the Immunity Performance that system distorts to line voltage, when network of ship Voltage unbalance When, the technological means can effectively suppress output-power fluctuation, so as to ensure stablizing for Electrical system for a ship sensitive load Operation.
Description of the drawings：
Control methods of the Fig. 1 for the Electrical system for a ship combining inverter based on voltage compensation of an embodiment of the present invention Flow chart；
Electrical system for a ship three-phase grid-connected inverter topological diagrams containing LCL filter of the Fig. 2 for an embodiment of the present invention；
Orthogonal signal generator structure charts based on Generalized Integrator of the Fig. 3 for an embodiment of the present invention；
Single synchronous coordinate system phase lock control schematic diagrams of the Fig. 4 for an embodiment of the present invention；
Fig. 5 extracts schematic diagram for the positive-negative sequence component of voltage based on Generalized Integrator of an embodiment of the present invention；
Network of ship positive-negative sequence voltage signal acquisition schematic diagrams of the Fig. 6 for an embodiment of the present invention；
Voltage compensation schematic diagrams of the Fig. 7 for an embodiment of the present invention；
Inverter output voltage comparison of wave shape figures of the Fig. 8 for an embodiment of the present invention, wherein, figure (a) is adopted for inverter With the voltage waveform design sketch of traditional control method, it is using the voltage waveform design sketch for improving control method to scheme (b)；
Inverter active power of output comparison of wave shape figures of the Fig. 9 for an embodiment of the present invention, wherein, figure (a) is inversion Active power waveform effect figure of the device using traditional control method, it is using the active power for improving control method to scheme (b) Waveform effect figure；
Inverter output reactive power comparison of wave shape figures of the Figure 10 for an embodiment of the present invention, wherein, figure (a) is inversion Reactive power waveform effect figure of the device using traditional control method, it is using the reactive power for improving control method to scheme (b) Waveform effect figure.
Specific embodiment：
With reference to the accompanying drawings and examples, the present invention is further described.
In the embodiment of the present invention, based on the control method of the Electrical system for a ship combining inverter of voltage compensation, method stream Journey figure is as shown in figure 1, comprise the following steps：
The topological structure of three-phase grid-connected inverter when step 1, structure ship are grid-connected；
In the embodiment of the present invention, when Electrical system for a ship is grid-connected, it is only necessary to consider which need to meet grid-connected bar as AC Part, without the need for considering control DC voltage, thus, can select single-stage type inverter structure.Simultaneously because ship load is held Amount is big, and ship grid-connection device belongs to high-power grid-connection device, need to meet the access characteristic of the three-phase three-wire system of network of ship, therefore inverse Become the topological structure that device chooses three phase full bridge inversion.
It is connected by LCL filter between inverter output end and network of ship, it is adaptable to which the low of Electrical system for a ship is opened The middle large-power occasions of frequency are closed, the work(of the application scenario, working condition and Electrical system for a ship equipment of ship is considered Rate rank, in the embodiment of the present invention, devises the Electrical system for a ship three-phase grid-connected inverter topological diagram containing LCL filter, such as Shown in Fig. 2, including：Three groups of power switch pipe T1～T6And antiparallel sustained diode therewith1～D6, a, b, c represent ship The three-phase of electrical network, inverter side filter inductance Lia～Lic, filter capacitor Ca～Cc, Electrical system for a ship net side filter inductance Loa~ Loc。Ria、Rib、RicFor the dead resistance of inverter side filter inductance, Roa、Rob、RocIt is the dead resistance of net side wave filter, direct current Side bus voltage is denoted as Vdc, dc bus flows to the electric current of inverter bridge and is denoted as idc, the output current of inverter bridge is denoted as i respectivelyia、 iibAnd iic, flow into filter capacitor electric current be denoted as ica、icb、icc, the electric current for flowing through net side filter inductance is denoted as ioa、iob、ioc, Uca、Ucb、UccRepresent the terminal voltage of filter capacitor, Uga、Ugb、UgcIt is the phase voltage of each phase of network of ship, P represents dc bus just Pole, N represent dc bus negative pole, and O represents the neutral point of ship three phase network.
In the embodiment of the present invention, the foundation of mathematical model is not considered the loss of power switch pipe, and same bridge arm is upper and lower The dead band interval of two switching tubes, inverter side output voltage UkNWith its DC voltage VdcBetween relation it is as follows：
UkN=SkVdc (4)
Wherein, UkNThe phase voltage of (k=a, b, c) for network of ship, SkTo describe inverter leg switching elements conductive shape The two-valued function function of state, Sk=0 switching elements conductive for representing bridge arm the latter half, the switch element of top half are closed, Sk =1 switching elements conductive for representing bridge arm top half, the switch element of the latter half are closed.VdcFor DC bus-bar voltage.
The voltage of inverter ac side, current equation are as follows：
Wherein, k=a, b, c represent the three-phase of network of ship, LikFor wave filter side filter inductance, iikRepresent inverter bridge Output current, CkIt is filter capacitor, UkNRepresent the voltage of each relative dc bus negative pole, UckThe terminal voltage of filter capacitor is represented, RikFor the dead resistance of inverter side filter inductance, UNODc bus negative pole is represented to the voltage of network of ship three-phase neutral point, LokFor Electrical system for a ship net side filter inductance, iokRepresent net side filter inductance electric current, UgkRepresent the mutually electricity of each phase of network of ship Pressure, RokFor the dead resistance of net side wave filter, ickExpression flows through the electric current of filter capacitor.
As inverter ac side is the mode of connection of three-phase three-wire system, therefore the inverter side filtered electrical by wave filter The three-phase current summation of sense, net side filter inductance and filter capacitor is zero.
Voltage U between dc bus and network of ship neutral pointNOFor：
In switch periods, DC bus-bar voltage is continuous and approximate constant, the output voltage U of inverter ac sidegk Can be equivalent to by switch function SkThe voltage source of control.
The three-phase voltage equation of combining inverter AC is represented by：
Then have, in three-phase static coordinate system, formula is as follows for the mathematical model of Electrical system for a ship combining inverter topology：
AC inverter AC network of ship voltage equation is as follows：
Current equation is as follows：
Inverter direct-flow side electric current and each phase inverter bridge bridge switching tube function of state, and inverter ac side is every defeated The relation gone out between electric current is：
Wherein, idcFor inverter direct-flow side electric current, SkFor each phase inverter bridge bridge switching tube function of state；
When certain phase inverter bridge bridge is turned on, phase switching tube function of state Sk=1, during shut-off, Sk=0.
AC network of ship voltage equation and current equation under three-phase static coordinate system is converted through CLARK, is obtained To Electrical system for a ship combining inverter topology mathematical model in two-phase rest frame equation, concrete formula is as follows：
In the embodiment of the present invention, each alternate parameter of LCL filter of designed circuit topology is identical, therefore has：Lia=Lib =Lic=L1, Ria=Rib=Ric=Ri, Loa=Lob=Loc=L2, Roa=Rob=Roc=RoAnd Ca=Cb=Cc=C.CLARK Transformation matrix is as follows：
Likewise, the DC side electric current and each phase current under two-phase rest frame meets following relation：
Step 2, according to ship it is grid-connected when three-phase grid-connected inverter topological structure, the amplitude, phase place and frequency to line voltage Rate is detected that positive-negative sequence component of voltage under two phase coordinate system of acquisition network of ship voltage is specific as follows：
Three-phase voltage signal U in step 2-1, collection electrical networka、Ub、Uc, by three-phase voltage signal Ua、Ub、UcCarry out CLARK Conversion, obtains α β two-phase voltage signal Uα、Uβ；
In the embodiment of the present invention, during Electrical system for a ship unbalanced source voltage, according to symmetrical component method, unbalance voltage Positive sequence, negative phase-sequence and zero-sequence component are decomposed into, are expressed as follows：
Wherein, UP、UN、U0Positive-sequence component, negative sequence component and the zero-sequence component of ship unbalance voltage are represented respectively,WithThe initial phase angle of negative sequence voltage components and zero sequence voltage component is represented respectively.
Positive-sequence component in unbalance voltage is abbreviated as：
Wherein,
In formula (16), D is symmetrical matrix, and δ is transformation factor, by way of CLARK is converted, is eliminated in unbalance voltage Zero-sequence component impact, obtain unbalance voltage in (α, β) coordinate system：
Step 2-2, the method for being integrated process by the two-phase voltage signal to obtaining, obtain phase place mutual deviation respectively 90 ° of quadrature voltage signal；
In the embodiment of the present invention, the described method for being integrated process to the two-phase voltage signal for obtaining is specific as follows：
Generalized Integrator phaselocked loop is introduced, the phaselocked loop is using the orthogonal signal generator based on Generalized Integrator, structure Figure as shown in figure 3, respectively the α components and β to line voltage under (α, β) coordinate system carry out delayed 90 ° phase offset process, The transmission function of the Generalized Integrator, concrete formula are as follows：
Wherein, D (s) represents the transmission function of the orthogonal signal generator output voltage signal U ' based on Generalized Integrator, U For the ac voltage signal of input, U ' is the voltage signal that the orthogonal signal generator based on Generalized Integrator is exported, and k just represents The damped coefficient of signal generator, ω ' is handed over to represent the resonant frequency of orthogonal signal generator, Q (s) is represented based on Generalized Integrator Orthogonal signal generator output voltage signal qU ' transmission function, qU ' for 90 ° of delayed U ' voltage signals output voltage believe Number,Represent integral unit；
Described Generalized Integrator, the magnitude relation of its input and output voltage signal, concrete formula are as follows：
Wherein, frequencies of the ω for input voltage signal U, Q2Represent the amplitude change of Generalized Integrator output U ' voltage signals Amount, D2Represent that Generalized Integrator exports the amplitude variable quantity of qU ' voltage signals, ∠ D represent Generalized Integrator output U ' voltage letters Number phase angle, ∠ Q represent Generalized Integrator export qU ' signals phase angle.
Step 2-3, PI controls are carried out to the quadrature voltage signal under two phase coordinate systems by single synchronous coordinate system phaselocked loop Adjust, after being adjusted, the amplitude of quadrature voltage signal, phase and frequency, specific as follows：
In the embodiment of the present invention, single synchronous coordinate system phase lock control schematic diagram is as shown in figure 4, by under two phase coordinate systems of α β Voltage signal be converted into the voltage signal under dq coordinate systems；
The voltage signal under dq coordinate systems is adjusted using PI control algolithms, makes positive sequence voltage signal amplitude level off to 0, angular frequency of the frequency with setting is overlapped by the frequency after being adjusted, and obtains the defeated of single synchronous coordinate system phaselocked loop Go out frequency, using the frequency as Generalized Integrator in step 2-2 resonant frequency；
Judge whether the resonant frequency of Generalized Integrator is equal with the frequency of network of ship three-phase voltage signal, if so, then Electrical system for a ship is stable, without the need for amendment；Otherwise, by the resonant frequency of Generalized Integrator and network of ship three-phase voltage signal Frequency is compared, and obtains compensation dosage, the compensation dosage is fed back in phaselocked loop PI control units, the resonance of Generalized Integrator is made Frequency is equal with the frequency of network of ship three-phase voltage signal.
Step 2-4, the quadrature voltage signal of acquisition is carried out positive-negative sequence voltage calculating, obtain the biphase seat of network of ship voltage The lower positive-negative sequence component of voltage of mark system
In the embodiment of the present invention, the positive-negative sequence component of voltage based on Generalized Integrator extracts schematic diagram as shown in figure 5, injustice Positive-sequence component in weighing apparatus voltage is abbreviated as under (α, β) coordinate system：
Wherein, Tabc/αβIt is CLARK transformation matrixs；
Therefore have：
Wherein,Expression lags behind primary voltage phase place
Negative sequence component in network of ship unbalance voltage can equally carry out above-mentioned conversion；
Therefore, the positive-sequence component of the network of ship unbalance voltage under (α, β) coordinate systemNegative sequence componentIt is public Formula is as follows：
Positive-negative sequence component of voltage under step 3, two phase coordinate systems of α β for obtaining step 2 carries out dq coordinate transforms, passes through Second-order low-pass filter obtains the positive-negative sequence voltage signal of low frequency；
In the embodiment of the present invention, network of ship positive-negative sequence voltage signal acquisition schematic diagram is as shown in fig. 6, three-phase electricity in electrical network Pressure signal Ua、Ub、Uc, positive-negative sequence component of voltage under two phase coordinate system of Jing steps 2 process acquisition network of ship voltageDq Coordinate Conversion is carried out, by second-order low-pass filter, the voltage signal of low frequency is obtainedSecond order The transmission function of low pass filter LPF is as follows：
Wherein, ωcutRepresent the cut-off frequency of LPF, attenuation quotients of the ξ for LPF；
Step 4, the positive-negative sequence component of voltage of the low frequency of acquisition is carried out voltage unbalance factor calculating, obtain Voltage unbalance Degree；
In the embodiment of the present invention, voltage compensation schematic diagram is as shown in fig. 7, the voltage letter of the low frequency for obtaining step 3 Number Voltage unbalance factor calculating is carried out, voltage unbalance factor VUF is obtained；
Step 5, the voltage unbalance factor VUF and given voltage unbalance factor VUF that will be obtained*It is compared, and adopts PI control methods, obtain voltage feedback factor Ucr；
Step 6, the voltage feedback factor of acquisition is given the Voltage loop in former Electrical system for a ship PI control units, it is real Now to voltage compensation during Electrical system for a ship Voltage unbalance.
In the embodiment of the present invention, PI control units adopt PI controllers, by obtain voltage unbalance factor VUF with it is given Voltage unbalance factor VUF*It is compared, and by PI controllers, voltage feedback factor U is obtained by PI control methodscr, by electricity Pressure feedback factor UcrThe Voltage loop of PI controllers in former Electrical system for a ship is given, to PI controllers in former Electrical system for a ship Given input compensate, realize to voltage compensation during Electrical system for a ship Voltage unbalance.
In the embodiment of the present invention, the control method analogous diagram of Electrical system for a ship combining inverter, in such as Fig. 8 scheme (a) and Scheme shown in (a) and figure (b) in figure (a) and figure (b), Figure 10 in figure (b), Fig. 9.Based on described new phase-locked loop structures and change The voltage compensation method entered builds Electrical system for a ship electric network model, and simulation software adopts Matlab/Simulink, inversion Device power grade adopts 100kW, and in simulation parameter, output is set to 100kVA, and network of ship voltage rating is set to 400V, controller internal ring K11、K120.75,22 are respectively set as, controller outer shroud K21、K228,0.79 is respectively set as, voltage control Device K processed31、K32It is respectively set as 0.535,7.
Fig. 8 is inverter output voltage comparison of wave shape figure, wherein, scheme the electricity that (a) adopts traditional control method for inverter Corrugating design sketch, it is using the voltage waveform design sketch for improving control method to scheme (b)；It can be seen that employing traditional control method When, there is imbalance in points of common connection (PCC points) place's voltage, and using improving after control method, network of ship Voltage unbalance is obtained To being effectively improved, the amplitude of three-phase voltage is equal to the set-point of voltage.
Fig. 9, Figure 10 are respectively inverter active power of output comparison of wave shape figure and inverter output reactive power waveform pair Than figure, in wherein Fig. 9, the active power waveform effect figure that (a) adopts traditional control method for inverter is schemed, figure (b) is employing The active power waveform effect figure for improving control method；In Figure 10, the nothing that (a) adopts traditional control method for inverter is schemed Work(power waveform design sketch, it is using the reactive power waveform effect figure for improving control method to scheme (b)；Traditional controlling party Method does not add the power output of voltage compensation link, network of ship inverter to generate significantly fluctuation, using improved inversion Device control method, after adding voltage compensator, the active output of inverter follows given value stabilization output, while reactive power Waveform is also greatly improved.

Claims (3)

1. a kind of control method of the Electrical system for a ship combining inverter based on voltage compensation, it is characterised in that：Comprising following Several steps：
The topological structure of three-phase grid-connected inverter when step 1, structure ship are grid-connected；
Step 2, according to ship it is grid-connected when three-phase grid-connected inverter topological structure, the amplitude, phase and frequency to line voltage enter Row detection, obtains positive-negative sequence component of voltage under two phase coordinate system of network of ship voltage, specific as follows：
Three-phase voltage signal is carried out CLARK conversion, obtains α β two-phase voltages by three-phase voltage signal in step 2-1, collection electrical network Signal；
Step 2-2, the two-phase voltage signal to obtaining are integrated process, obtain the quadrature voltage letter of 90 ° of phase place mutual deviation respectively Number；
Step 2-3, PI control and regulation are carried out to the quadrature voltage signal under two phase coordinate systems by single synchronous coordinate system phaselocked loop, The amplitude of quadrature voltage signal, phase and frequency after being adjusted；
Step 2-4, the quadrature voltage signal of acquisition is carried out positive-negative sequence voltage calculating, obtain two phase coordinate system of network of ship voltage Lower positive-negative sequence component of voltage；
Positive-negative sequence component of voltage under step 3, two phase coordinate systems of α β for obtaining step 2 carries out dq coordinate transforms, by second order Low pass filter obtains the positive-negative sequence voltage signal of low frequency；
Step 4, the positive-negative sequence component of voltage of the low frequency of acquisition is carried out voltage unbalance factor calculating, obtain voltage unbalance factor；
Step 5, the voltage unbalance factor of acquisition and given voltage unbalance factor are carried out differing from process, using PI control methods Obtain voltage feedback factor；
Step 6, the Voltage loop given the voltage feedback factor of acquisition in Electrical system for a ship PI control units, realize to ship Voltage compensation when oceangoing ship electrical system voltage is uneven.
2. the control method of the Electrical system for a ship combining inverter based on voltage compensation according to claim 1, which is special Levy and be：The two-phase voltage signal to acquisition described in step 2-2 is integrated process, specially：Using based on improper integral The orthogonal signal generator of device, carries out delayed 90 ° of phase place respectively to positive-negative sequence component of voltage under two phase coordinate system of line voltage Migration processing；
The transmission function of the Generalized Integrator, concrete formula are as follows：
D ( s ) = U ′ U = kω ′ s ω ′ 2 + kω ′ s + s 2 Q ( s ) = qU ′ U = kω ′ ω ′ 2 + kω ′ s + s 2 - - - ( 1 )
Wherein, D (s) represents the transmission function of the orthogonal signal generator output voltage signal U ' based on Generalized Integrator, and U is defeated The ac voltage signal for entering, U ' are the voltage signal that the orthogonal signal generator based on Generalized Integrator is exported, and k represents orthogonal letter The damped coefficient of number generator, ω ' represent the resonant frequency of orthogonal signal generator, and Q (s) is just represented based on Generalized Integrator The transmission function of generator output voltage signal qU ' is handed over, qU ' is the output voltage signal of 90 ° of delayed U ' voltage signals, Represent integral unit；
Described Generalized Integrator, the magnitude relation of its input and output voltage signal, concrete formula are as follows：
U ′ = D ( s ) U D 2 = ( kω ′ ω ) 2 ( kω ′ ω ) 2 + ( ω 2 - ω ′ 2 ) 2 ∠ D = tan - 1 ( ω ′ 2 - ω 2 kω ′ ω ) - - - ( 2 )
qU ′ = Q ( s ) U Q 2 = ω ′ 2 ω 2 D 2 ∠ Q = ∠ D - π 2 - - - ( 3 )
Wherein, frequencies of the ω for input voltage signal U, Q2Represent that Generalized Integrator exports the amplitude variable quantity of U ' voltage signals, D2 Represent that Generalized Integrator exports the amplitude variable quantity of qU ' voltage signals, ∠ D represent that Generalized Integrator exports the phase of U ' voltage signals Angle, ∠ Q represent that Generalized Integrator exports the phase angle of qU ' signals.
3. the control method of the Electrical system for a ship combining inverter based on voltage compensation according to claim 1, which is special Levy and be：PI is carried out to the quadrature voltage signal under two phase coordinate systems by single synchronous coordinate system phaselocked loop described in step 2-3 Control and regulation, after being adjusted, the amplitude of quadrature voltage signal, phase and frequency, specific as follows：
Step 2-4-1, the voltage signal under two phase coordinate systems of α β is converted into into the voltage signal under dq coordinate systems；
Step 2-4-2, the voltage signal under dq coordinate systems is adjusted using PI control methods, makes positive sequence voltage signal amplitude Level off to 0, angular frequency of the frequency with setting is overlapped by the frequency after being adjusted, obtain single synchronous coordinate system lock phase The output frequency of ring, using the frequency as Generalized Integrator in step 2-2 resonant frequency；
Whether step 2-4-3, the resonant frequency for judging Generalized Integrator are equal with the frequency of network of ship three-phase voltage signal, if It is that then Electrical system for a ship is stable, without the need for amendment；Otherwise, by the resonant frequency of Generalized Integrator and network of ship three-phase voltage The frequency of signal is compared, and obtains compensation dosage, the compensation dosage is fed back in phaselocked loop PI control units, Generalized Integrator is made Resonant frequency it is equal with the frequency of network of ship three-phase voltage signal.
CN201611128445.3A 2016-12-09 2016-12-09 Voltage compensation-based grid-connected inverter control method for marine electrical system Pending CN106533238A (en)

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