CN105356499B - The control method of grid stimulating device - Google Patents
The control method of grid stimulating device Download PDFInfo
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- CN105356499B CN105356499B CN201510705228.5A CN201510705228A CN105356499B CN 105356499 B CN105356499 B CN 105356499B CN 201510705228 A CN201510705228 A CN 201510705228A CN 105356499 B CN105356499 B CN 105356499B
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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
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Abstract
The present invention provides a kind of control methods of grid stimulating device, include the following steps：Its value after positive and negative zero sequence decomposition is carried out on d q coordinate systems is calculated according to the given three-phase voltage signal of output；Output three-phase voltage and capacitance current signal are sampled；Outer voltage is controlled using PR adjusters, and current inner loop is controlled using PID regulator；Space vector conversion is carried out to current inner loop output signal, is modulated using three-dimensional space vectors, generates the pwm signal of control three-phase four-arm；Export three-phase target voltage.Method provided by the invention only need to be by changing the value and frequency f that input positive and negative zero sequence on d q coordinate systems, you can realizes and exports different types of given voltage.Three-phase four-leg inverter outer voltage uses PR controllers, and the control effect that can reach without carrying out coordinate transform is simple and practical.Three-phase Setting signal generates control method and three-phase four-leg inverter control strategy, is all easier to realize Digital Control.
Description
Technical field
The present invention relates to electrical engineering field, the control method of grid stimulating device is specifically related to, in particular by three
Phase four-leg inverter carries out the grid stimulating device control method of inversion conversion.
Background technology
In recent years, wind energy, photovoltaic distributed electricity generation system because its cleaning, it is sustainable, generation mode is flexible the features such as due to
It is concerned.Net DianKeYuan report display China of state has become the photovoltaic cell component producing country of maximum in the world, to 2020
The installation total amount of year China photovoltaic power generation is up to 20GW-50GW.Photovoltaic distributed electricity generation system passes through inverter and power grid
It is connected, brings challenges to operation of power networks, requirement is proposed to the ability of network optimization configuration resource.
For the grid-connected caused various technical problems of distributed generation system, such as power quality, voltage power-less, isolated island effect
Should, relay protection and safety and stability problem etc., State Grid Corporation of China has formulated a series of regulations and has required distributed generation system simultaneously
Relevant criterion should be reached during net.Therefore need to study distributed generation system interconnection technology, build distributed generation system detection
Ability.The key for the problems such as distributed generation system is grid-connected is studied under grid fault conditions, and distributed generation system is grid-connected
Whether relevant parameter meets what Guo Wang companies issued《Photovoltaic plant access electric power network technique regulation》.
However under normal circumstances, power grid provides the sinusoidal voltage of three-phase symmetrical, and power grid the situation of all kinds of failures occurs simultaneously
It is uncommon.Therefore in the grid-connected characteristic of detection distributed generation system, it is necessary to which a set of can simulate the dress for generating all kinds of failures of power grid
It puts.But domestic to special grid simulator research not system, external then study more perfect simultaneously has been enter into commercialization rank
Section, but the grid stimulating device price of function admirable is very expensive, it is difficult to it is used in common test.Therefore, power grid is simulated
The research of device, which still has, to have very important significance.
The grid simulator inverter side topological structure of studies in China has using three single-phase simulating grid three-phases respectively at present
Output is also had and is exported using three-phase half-bridge structure inverter simulating grid, but all there is defects for these topological structures.Such as
The structure of simulating grid three-phase output is distinguished using three single-phase inverters can so that entire grid stimulating device volume is excessive, firmly
Part is more, there are problems that being adjusted in synchronism between three-phase output and communicate.And the power grid of three-phase half-bridge structure inverter is used to simulate
Because can not provide passage in three-phase three-wire circuit to zero-sequence component, zero-sequence component is not present in power grid, it is impossible to simulate in device
The unbalanced fault that power grid occurs.
The content of the invention
For in the prior art the defects of, the object of the present invention is to provide a kind of control methods of grid stimulating device.
The present invention is directed to the input Setting signal of grid stimulating device, devises the Setting signal based on vector and generates
Control method；For the three-phase four-leg inverter that grid stimulating device uses, devise and be not required to synchronize coordinate decomposition control
The control strategy of system, wherein outer voltage use PID control using the PR controls under static three phase coordinates, current inner loop.
The control method of the grid stimulating device provided according to the present invention, includes the following steps：
Step 1：The given three-phase voltage of the input numerical value of positive and negative zero sequence and deviation frequency f in synchronous d-q coordinate systems；
Step 2：The value inputted in step 1 is obtained into three-phase output voltage Setting signal by vector inverse transformation
Step 3：Gather three-phase output voltage signal ua、ub、uc；
Step 4：The three-phase output voltage signal u that will be collecteda、ub、ucWith given three-phase voltage signal It is compared, obtains three-phase voltage and compare difference DELTA ua、Δub、Δuc；
Step 5：The three-phase voltage that step 4 is obtained compares difference DELTA ua、Δub、ΔucBy PR adjusters, electric current is obtained
The reference value of inner ring
Step 6：Gather outlet side three phase capacitance electric current iCa、iCb、iCc, by the capacitance current i of acquisitionCa、iCb、iCcWith step
5 obtained current reference valuesIt is compared to obtain difference DELTA iCa、ΔiCb、ΔiCc, Δ iCa、ΔiCb、ΔiCc
It is adjusted by PID, obtains three-phase output voltage modulated signal uta、utb、utc；
Step 7：To the three-phase output voltage modulated signal u obtained in step 6tabcCarry out space vector conversion, obtain α,
β, 0 component uα、uβ、u0, wherein transformation for mula is as follows；
In formula：uαRepresent voltage value in static 0 coordinate system α axis of α β, uβRepresent voltage value in static 0 coordinate system β axis of α β, u0
Represent voltage value in static 0 coordinate system o axis of α β, utaRepresent a phase modulation voltages, utbRepresent b phase modulation voltages, utcRepresent that c phases are adjusted
Voltage processed；
Step 8：By α, β, 0 component by three-dimensional space vector modulation, the pwm signal of four bridge arms of inverter is obtained.
Preferably, the step 2 includes：
Step 2.1：D, q value and the value of deviation frequency f are given according to positive and negative zero sequence, obtain relevant cos ω t, sin ω t
So as to calculate zero sequence voltage component, calculation formula is as follows：
The π f of ω=2；
u0=d0cosωt；
In formula：u0Represent zero sequence given voltage, d0Represent zero sequence set-point in the synchronous d-q coordinate systems of input, ω represents zero
The angular frequency of sequence voltage, t represent the time；
Step 2.2：The positive sequence of input is given d, q value to obtain, in static two-phase α β seat target values, calculating by C inverse transformations
Formula is as follows：
In formula：uα+Represent positive sequence value in static α β coordinate systems α axis, uβ+Represent positive sequence value in static α β coordinate systems β axis, ud+
Represent positive sequence set-point in the synchronous d-q coordinate systems d axis of input, uq+Represent that positive sequence gives in the synchronous d-q coordinate systems q axis of input
Value；
Step 2.3：Value under static two-phase α β coordinate systems is passed through into C23Conversion obtains positive sequence three-phase given voltage, calculates public
Formula is as follows：
In formula：ua+Represent positive sequence a phase given voltages, ub+Represent positive sequence b phase given voltages, uc+Represent the given electricity of positive sequence c phases
Pressure；
Step 2.4：The negative phase-sequence of input is given into d, q value by C inverse transformations and C23Conversion obtains negative phase-sequence three-phase given voltage,
Calculation formula is as follows：
In formula：uα-Represent negative phase-sequence value in static α β coordinate systems α axis, uβ-Represent negative phase-sequence value in static α β coordinate systems β axis, ud-
Represent negative phase-sequence set-point in the synchronous d-q coordinate systems d axis of input, uq-Represent that negative phase-sequence gives in the synchronous d-q coordinate systems q axis of input
Value, ua-Represent negative phase-sequence a phase given voltages, ub-Represent negative phase-sequence b phase given voltages, uc-Represent negative phase-sequence c phase given voltages；
Step 2.5：Positive and negative zero sequence three-phase given voltage according to abc three-phases is overlapped respectively, obtains given three-phase
Voltage signal, calculation formula are as follows：
In formula：Represent a phase given voltages,Represent b phase given voltages,Represent c phase given voltages.
Preferably, the step 5 includes：Outer voltage is controlled using PR adjusters, the principle formula that wherein PR is adjusted is such as
Under：
In formula：GPR(s) transmission function of PR adjusters, K are representedpRepresent proportional controller gain, KiRepresent resonance control
Device gain, n represent overtone order, ωcRepresent cutoff frequency, ω0Represent resonant frequency.
Preferably, the step 6 includes：Current inner loop, while the feedforward of three-phase given voltage are controlled using PID regulator
Control, obtains three-phase output voltage modulated signal.
Compared with prior art, the present invention has following advantageous effect：
1st, method provided by the invention only need to be by changing the value and frequency f that input positive and negative zero sequence on d-q coordinate systems, i.e.,
The different types of given voltage of output can be achieved.
2nd, three-phase four-leg inverter outer voltage uses PR controllers in method provided by the invention, without carrying out coordinate
The control effect that conversion can reach, it is simple and practical.
3rd, three-phase adjusts signal and generates control method and three-phase four-leg inverter control plan in method provided by the invention
Slightly, all it is easier to realize Digital Control.
Description of the drawings
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is three-phase given voltage output control method block diagram；
Fig. 2 is emulation module schematic diagram of the three-phase given voltage output control method in MATLAB/Simulink；
Fig. 3 is three-phase four-leg inverter double-closed-loop control block diagram；
Fig. 4 is grid stimulating device inverter and power grid connection diagram；
Fig. 5 is emulation module schematic diagram of the three-phase four-leg inverter in MATLAB/Simulink；
Fig. 6 is the whole system simulation model schematic diagram of grid stimulating device；
Fig. 7 is a phase voltage output valves that grid stimulating device simulates normal three-phase voltage；
Fig. 8 is that grid stimulating device simulates a phase voltage output valves that three-phase voltage falls；
Fig. 9 is a phase voltage output valves that grid stimulating device simulates three-phase voltage frequency offset.
Specific embodiment
With reference to specific embodiment, the present invention is described in detail.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill to this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection domain.
According to the given three-phase voltage signal of outputIt calculates it and positive-negative sequence decomposition is carried out on d-q coordinate systems
Value afterwards；Output three-phase voltage and capacitance current signal are sampled；Current inner loop is controlled using PID regulator, outside voltage
Ring is controlled using PR adjusters；Space vector conversion is carried out to current inner loop output signal, is adjusted using three-dimensional space vectors
System generates the pwm signal of control inverter, exports three-phase target voltage.
The control method of grid stimulating device provided by the invention, includes the following steps：
Step 1：The given three-phase voltage of the input numerical value of positive and negative zero sequence and deviation frequency f in synchronous d-q coordinate systems；
Step 2：The value inputted in step 1 is obtained into three-phase output voltage Setting signal by vector inverse transformation
Step 3：Gather three-phase output voltage signal ua、ub、uc；
Step 4：The three-phase output voltage signal u that will be collecteda、ub、ucWith given three-phase voltage signal It is compared, obtains three-phase voltage and compare difference DELTA ua、Δub、Δuc；
Step 5：The three-phase voltage that step 4 is obtained compares difference DELTA ua、Δub、ΔucBy PR adjusters, electric current is obtained
The reference value of inner ring
Step 6：Gather outlet side three phase capacitance electric current iCa、iCb、iCc, by the capacitance current i of acquisitionCa、iCb、iCcWith step
5 obtained current reference valuesIt is compared to obtain difference DELTA iCa、ΔiCb、ΔiCc, Δ iCa、ΔiCb、ΔiCc
It is adjusted by PID, obtains three-phase output voltage modulated signal uta、utb、utc；
Step 7：To the three-phase output voltage modulated signal u obtained in step 6ta、utb、utcSpace vector conversion is carried out, is obtained
To α, β, 0 component uα、uβ、u0, wherein transformation for mula is as follows；
In formula：uαRepresent voltage value in static 0 coordinate system α axis of α β, uβRepresent voltage value in static 0 coordinate system β axis of α β, u0
Represent voltage value in static 0 coordinate systems of α β, 0 axis, utaRepresent a phase modulation voltages, utbRepresent b phase modulation voltages, utcRepresent that c phases are adjusted
Voltage processed；
Step 8：By α, β, 0 component by three-dimensional space vector modulation, the pwm signal of four bridge arms of inverter is obtained.
Specifically, as shown in Figure 1, three-phase voltage determines that three-phase falls ratio respectively respectively by Voltage Drop ratio module
Example size.The change of positive and negative zero sequence d, q value can determine the size of positive and negative zero-sequence output voltage respectively, by positive and negative residual voltage
, there is output voltage so as to simulating grid and fall in size and its degree of unbalancedness superimposed and that can obtain output Setting signal
Failure；The frequency f values of input can determine the frequency of output Setting signal, and event is deviated so as to the simulating grid frequency of occurrences
Barrier.
Preferably, the step 2 includes：
Step 2.1：D, q value and the value of deviation frequency f are given according to positive and negative zero sequence, obtain relevant cos ω t, sin ω t
So as to calculate zero sequence voltage component, calculation formula is as follows：
The π f of ω=2
u0=d0cosωt；
In formula：u0Represent zero sequence given voltage, d0Represent zero sequence set-point in the synchronous d-q coordinate systems of input, ω represents zero
The angular frequency of sequence voltage, t represent the time；
Step 2.2：The positive sequence of input is given d, q value to obtain, in static two-phase α β seat target values, calculating by C inverse transformations
Formula is as follows：
In formula：uα+Represent positive sequence value in static α β coordinate systems α axis, uβ+Represent positive sequence value in static α β coordinate systems β axis, ud+
Represent positive sequence set-point in the synchronous d-q coordinate systems d axis of input, uq+Represent that positive sequence gives in the synchronous d-q coordinate systems q axis of input
Value；
Step 2.3：Value under static two-phase α β coordinate systems is passed through into C23Conversion obtains positive sequence three-phase given voltage, calculates public
Formula is as follows：
In formula：ua+Represent positive sequence a phase given voltages, ub+Represent positive sequence b phase given voltages, uc+Represent the given electricity of positive sequence c phases
Pressure；
Step 2.4：The negative phase-sequence of input is given into d, q value by C inverse transformations and C23Conversion obtains negative phase-sequence three-phase given voltage,
Calculation formula is as follows：
In formula：uα-Represent negative phase-sequence value in static α β coordinate systems α axis, uβ-Represent negative phase-sequence value in static α β coordinate systems β axis, ud-
Represent negative phase-sequence set-point in the synchronous d-q coordinate systems d axis of input, uq-Represent that negative phase-sequence gives in the synchronous d-q coordinate systems q axis of input
Value, ua-Represent negative phase-sequence a phase given voltages, ub-Represent negative phase-sequence b phase given voltages, uc-Represent negative phase-sequence c phase given voltages；
Step 2.5：Positive and negative zero sequence three-phase given voltage according to abc three-phases is overlapped respectively, obtains given three-phase
Voltage signal, calculation formula are as follows：
In formula：Represent a phase given voltages,Represent b phase given voltages,Represent c phase given voltages.
Preferably, the step 5 includes：Outer voltage is controlled using PR adjusters, the principle formula that wherein PR is adjusted is such as
Under：
In formula：GPR(s) transmission function of PR adjusters, K are representedpRepresent proportional controller gain, KiRepresent resonance control
Device gain, n represent overtone order, ωcRepresent cutoff frequency, ω0Represent resonant frequency.
Preferably, the step 6 includes：Current inner loop, while the feedforward of three-phase given voltage are controlled using PID regulator
Control, obtains three-phase output voltage modulated signal.
Specifically, as shown in Figure 3, Figure 4, the control strategy of three-phase four-leg inverter is specifically included using PR adjusters
Outer voltage controls, using the current inner loop control of PID regulator and the feedforward control of three-phase given voltage, wherein inverter
Control strategy be all based on rest frame, without carrying out space vector conversion.
Further, the frequency-domain analysis result of resonance PR adjusters control can be obtained in MATLAB, it can be deduced that
Conclusion be ωcFor 0 when, at resonant frequency, resonant controller gain is infinity, but with ωcIncrease, resonance control
Device gain at resonance point is reduced, and bandwidth increases.Resonant controller can also provide enough it even if under electric voltage frequency fluctuation
Big amplitude gain.PR adjusters can be by setting different resonant frequencies, can be very to control the harmonic wave in output voltage
Control harmonic wave well.
According to the three-phase given voltage that given voltage generation module generates, three-phase output voltage is collected, is compared,
Difference will be compared by PR adjusters, setting in PR adjusters needs the harmonic frequency controlled, the output valve conduct of PR adjusters
The reference value of current inner loop, is adjusted by PID regulator, obtains the modulated signal of three-phase four-leg inverter, controls inverter
Generate desired output voltage signal.
Specifically, as shown in fig. 6, providing grid stimulating device system simulation model in figure, specific simulation parameter is as follows
Shown in table：
The relevant parameter of 1 grid stimulating device of table
The present invention will verify the validity of put forward control strategy and accuracy from following three kinds of grid operating conditions：
(1) grid stimulating device simulation generates normal three phase sine voltage；
(2) grid stimulating device simulation three-phase voltage balance in 0.2s falls 50%；
(3) grid stimulating device simulation three-phase voltage frequency in 0.2s is deviated from 50Hz as 30Hz.
The grid operating conditions simulated according to grid stimulating device can obtain, and grid operating conditions are all in equilibrium state
Under：The first operating condition is three phase sine voltage；Second of operating condition is that three-phase voltage balance is fallen, i.e., three-phase voltage is all
The 50% of initial value is dropped into 0.2s；The third operating condition is three-phase voltage frequency offset, i.e., three-phase voltage frequency exists
It is all deviated during 0.2s from 50Hz as 30Hz.As long as it therefore provides the phase voltage in three-phase and exports i.e. provable grid stimulating device
Correctness and validity.
Specifically, a phase voltages being illustrated in figure 7 in normal three phase sine voltage output, it can be seen that a phase voltages export
It is the sinusoidal waveform of standard, meets system requirements.
Specifically, it is illustrated in figure 8 three-phase voltage and falls a phase voltages in 50% output in 0.2s, it can be seen that
During 0.2s, voltage magnitude drops into 155V or so from 311V, meets system requirements.
Specifically, be illustrated in figure 9 three-phase voltage in 0.2s frequency from 50Hz offsets for 30Hz, can in figure from figure
To find out in 0.2s, electric voltage frequency is displaced to 30Hz from original 50Hz, and response is good, meets system requirements.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (4)
1. a kind of control method of grid stimulating device, which is characterized in that include the following steps：
Step 1：The given three-phase voltage of the input numerical value of positive and negative zero sequence and deviation frequency f in synchronous d-q coordinate systems；
Step 2：The value inputted in step 1 is obtained into three-phase output voltage set-point by vector inverse transformation
Step 3：Gather three-phase output voltage ua、ub、uc；
Step 4：The three-phase output voltage signal u that will be collecteda、ub、ucWith given three-phase voltage signal Into
Row compares, and obtains three-phase voltage and compares difference DELTA ua、Δub、Δuc；
Step 5：The three-phase voltage that step 4 is obtained compares difference DELTA ua、Δub、ΔucBy PR adjusters, current inner loop is obtained
Reference value
Step 6：Gather outlet side three phase capacitance electric current iCa、iCb、iCc, by the capacitance current i of acquisitionCa、iCb、iCcIt is obtained with step 5
The current reference value arrivedIt is compared to obtain difference DELTA iCa、ΔiCb、ΔiCc, Δ iCa、ΔiCb、ΔiCcBy
PID is adjusted, and obtains three-phase output voltage modulated signal uta、utb、utc；
Step 7：To the three-phase output voltage modulated signal u obtained in step 6ta、utb、utcCarry out space vector conversion, obtain α,
β, 0 component uα、uβ、u0, wherein transformation for mula is as follows；
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In formula：uαRepresent voltage value in static 0 coordinate system α axis of α β, uβRepresent voltage value in static 0 coordinate system β axis of α β, u0It represents
Voltage value in static 0 coordinate systems of α β, 0 axis, utaRepresent a phase modulation voltages, utbRepresent b phase modulation voltages, utcRepresent that c phases modulate electricity
Pressure；
Step 8：By α, β, 0 component by three-dimensional space vector modulation, the pwm signal of four bridge arms of inverter is obtained.
2. the control method of grid stimulating device according to claim 1, which is characterized in that the step 2 includes：
Step 2.1：D, q value and the value of deviation frequency f are given according to positive and negative zero sequence, obtain relevant cos ω t, sin ω t so as to
Zero sequence voltage component is calculated, calculation formula is as follows：
The π f of ω=2；
u0=d0cosωt；
In formula：u0Represent zero sequence given voltage, d0Represent zero sequence set-point in the synchronous d-q coordinate systems of input, ω represents zero sequence electricity
The angular frequency of pressure, t represent the time；
Step 2.2：The positive sequence of input is given d, q value to obtain in static two-phase α β seat target values, calculation formula by C inverse transformations
It is as follows：
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In formula：uα+Represent positive sequence value in static α β coordinate systems α axis, uβ+Represent positive sequence value in static α β coordinate systems β axis, ud+It represents
Positive sequence set-point in the synchronous d-q coordinate systems d axis of input, uq+Represent positive sequence set-point in the synchronous d-q coordinate systems q axis of input；
Step 2.3：Value under static two-phase α β coordinate systems is passed through into C23Conversion obtains positive sequence three-phase given voltage, and calculation formula is such as
Under：
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<msub>
<mi>u</mi>
<mrow>
<mi>a</mi>
<mo>+</mo>
</mrow>
</msub>
</mtd>
</mtr>
<mtr>
<mtd>
<msub>
<mi>u</mi>
<mrow>
<mi>b</mi>
<mo>+</mo>
</mrow>
</msub>
</mtd>
</mtr>
<mtr>
<mtd>
<msub>
<mi>u</mi>
<mrow>
<mi>c</mi>
<mo>+</mo>
</mrow>
</msub>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>=</mo>
<mfenced open = "[" close = "]">
<mtable>
<mtr>
<mtd>
<mn>1</mn>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<mo>-</mo>
<mfrac>
<mn>1</mn>
<mn>2</mn>
</mfrac>
</mrow>
</mtd>
<mtd>
<mfrac>
<msqrt>
<mn>3</mn>
</msqrt>
<mn>2</mn>
</mfrac>
</mtd>
</mtr>
<mtr>
<mtd>
<mfrac>
<mn>1</mn>
<mn>2</mn>
</mfrac>
</mtd>
<mtd>
<mrow>
<mo>-</mo>
<mfrac>
<msqrt>
<mn>3</mn>
</msqrt>
<mn>2</mn>
</mfrac>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
<mfenced open = "[" close = "]">
<mtable>
<mtr>
<mtd>
<msub>
<mi>u</mi>
<mrow>
<mi>&alpha;</mi>
<mo>+</mo>
</mrow>
</msub>
</mtd>
</mtr>
<mtr>
<mtd>
<msub>
<mi>u</mi>
<mrow>
<mi>&beta;</mi>
<mo>+</mo>
</mrow>
</msub>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>;</mo>
</mrow>
In formula：ua+Represent positive sequence a phase given voltages, ub+Represent positive sequence b phase given voltages, uc+Represent positive sequence c phase given voltages；
Step 2.4：The negative phase-sequence of input is given into d, q value by C inverse transformations and C23Conversion obtains negative phase-sequence three-phase given voltage, calculates
Formula is as follows：
<mrow>
<mfenced open = "[" close = "]">
<mtable>
<mtr>
<mtd>
<msub>
<mi>u</mi>
<mrow>
<mi>&alpha;</mi>
<mo>-</mo>
</mrow>
</msub>
</mtd>
</mtr>
<mtr>
<mtd>
<msub>
<mi>u</mi>
<mrow>
<mi>&beta;</mi>
<mo>-</mo>
</mrow>
</msub>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>=</mo>
<mfenced open = "[" close = "]">
<mtable>
<mtr>
<mtd>
<mrow>
<mi>c</mi>
<mi>o</mi>
<mi>s</mi>
<mi>&omega;</mi>
<mi>t</mi>
</mrow>
</mtd>
<mtd>
<mrow>
<mo>-</mo>
<mi>s</mi>
<mi>i</mi>
<mi>n</mi>
<mi>&omega;</mi>
<mi>t</mi>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<mo>-</mo>
<mi>s</mi>
<mi>i</mi>
<mi>n</mi>
<mi>&omega;</mi>
<mi>t</mi>
</mrow>
</mtd>
<mtd>
<mrow>
<mo>-</mo>
<mi>cos</mi>
<mi>&omega;</mi>
<mi>t</mi>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
<mfenced open = "[" close = "]">
<mtable>
<mtr>
<mtd>
<msub>
<mi>u</mi>
<mrow>
<mi>d</mi>
<mo>-</mo>
</mrow>
</msub>
</mtd>
</mtr>
<mtr>
<mtd>
<msub>
<mi>u</mi>
<mrow>
<mi>q</mi>
<mo>-</mo>
</mrow>
</msub>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>;</mo>
</mrow>
<mrow>
<mfenced open = "[" close = "]">
<mtable>
<mtr>
<mtd>
<msub>
<mi>u</mi>
<mrow>
<mi>a</mi>
<mo>-</mo>
</mrow>
</msub>
</mtd>
</mtr>
<mtr>
<mtd>
<msub>
<mi>u</mi>
<mrow>
<mi>b</mi>
<mo>-</mo>
</mrow>
</msub>
</mtd>
</mtr>
<mtr>
<mtd>
<msub>
<mi>u</mi>
<mrow>
<mi>c</mi>
<mo>-</mo>
</mrow>
</msub>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>=</mo>
<mfenced open = "[" close = "]">
<mtable>
<mtr>
<mtd>
<mn>1</mn>
</mtd>
<mtd>
<mn>0</mn>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<mo>-</mo>
<mfrac>
<mn>1</mn>
<mn>2</mn>
</mfrac>
</mrow>
</mtd>
<mtd>
<mfrac>
<msqrt>
<mn>3</mn>
</msqrt>
<mn>2</mn>
</mfrac>
</mtd>
</mtr>
<mtr>
<mtd>
<mfrac>
<mn>1</mn>
<mn>2</mn>
</mfrac>
</mtd>
<mtd>
<mrow>
<mo>-</mo>
<mfrac>
<msqrt>
<mn>3</mn>
</msqrt>
<mn>2</mn>
</mfrac>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
<mfenced open = "[" close = "]">
<mtable>
<mtr>
<mtd>
<msub>
<mi>u</mi>
<mrow>
<mi>&alpha;</mi>
<mo>-</mo>
</mrow>
</msub>
</mtd>
</mtr>
<mtr>
<mtd>
<msub>
<mi>u</mi>
<mrow>
<mi>&beta;</mi>
<mo>-</mo>
</mrow>
</msub>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>;</mo>
</mrow>
In formula：uα-Represent negative phase-sequence value in static α β coordinate systems α axis, uβ-Represent negative phase-sequence value in static α β coordinate systems β axis, ud-It represents
Negative phase-sequence set-point in the synchronous d-q coordinate systems d axis of input, uq-Represent negative phase-sequence set-point in the synchronous d-q coordinate systems q axis of input,
ua-Represent negative phase-sequence a phase given voltages, ub-Represent negative phase-sequence b phase given voltages, uc-Represent negative phase-sequence c phase given voltages；
Step 2.5：Positive and negative zero sequence three-phase given voltage according to abc three-phases is overlapped respectively, obtains given three-phase voltage
Signal, calculation formula are as follows：
<mrow>
<mfenced open = "[" close = "]">
<mtable>
<mtr>
<mtd>
<msubsup>
<mi>u</mi>
<mi>a</mi>
<mo>*</mo>
</msubsup>
</mtd>
</mtr>
<mtr>
<mtd>
<msubsup>
<mi>u</mi>
<mi>b</mi>
<mo>*</mo>
</msubsup>
</mtd>
</mtr>
<mtr>
<mtd>
<msubsup>
<mi>u</mi>
<mi>c</mi>
<mo>*</mo>
</msubsup>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>=</mo>
<mfenced open = "[" close = "]">
<mtable>
<mtr>
<mtd>
<mrow>
<msub>
<mi>u</mi>
<mrow>
<mi>a</mi>
<mo>+</mo>
</mrow>
</msub>
<mo>+</mo>
<msub>
<mi>u</mi>
<mrow>
<mi>a</mi>
<mo>-</mo>
</mrow>
</msub>
<mo>+</mo>
<msub>
<mi>u</mi>
<mn>0</mn>
</msub>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msub>
<mi>u</mi>
<mrow>
<mi>b</mi>
<mo>+</mo>
</mrow>
</msub>
<mo>+</mo>
<msub>
<mi>u</mi>
<mrow>
<mi>b</mi>
<mo>-</mo>
</mrow>
</msub>
<mo>+</mo>
<msub>
<mi>u</mi>
<mn>0</mn>
</msub>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msub>
<mi>u</mi>
<mrow>
<mi>c</mi>
<mo>+</mo>
</mrow>
</msub>
<mo>+</mo>
<msub>
<mi>u</mi>
<mrow>
<mi>c</mi>
<mo>-</mo>
</mrow>
</msub>
<mo>+</mo>
<msub>
<mi>u</mi>
<mn>0</mn>
</msub>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>;</mo>
</mrow>
In formula：Represent a phase given voltages,Represent b phase given voltages,Represent c phase given voltages.
3. the control method of grid stimulating device according to claim 1, which is characterized in that the step 5 includes：Using
PR adjusters control outer voltage, and the principle formula that wherein PR is adjusted is as follows：
<mrow>
<msub>
<mi>G</mi>
<mrow>
<mi>P</mi>
<mi>R</mi>
</mrow>
</msub>
<mrow>
<mo>(</mo>
<mi>s</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<msub>
<mi>K</mi>
<mi>p</mi>
</msub>
<mo>+</mo>
<munder>
<mo>&Sigma;</mo>
<mrow>
<mi>n</mi>
<mo>=</mo>
<mn>1</mn>
<mo>,</mo>
<mn>3</mn>
<mo>,</mo>
<mn>5</mn>
<mo>,</mo>
<mo>...</mo>
</mrow>
</munder>
<mfrac>
<mrow>
<mn>2</mn>
<msub>
<mi>K</mi>
<mi>i</mi>
</msub>
<msub>
<mi>n&omega;</mi>
<mi>c</mi>
</msub>
<mi>s</mi>
</mrow>
<mrow>
<msup>
<mi>s</mi>
<mn>2</mn>
</msup>
<mo>+</mo>
<mn>2</mn>
<msub>
<mi>n&omega;</mi>
<mi>c</mi>
</msub>
<mi>s</mi>
<mo>+</mo>
<msup>
<mrow>
<mo>(</mo>
<msub>
<mi>n&omega;</mi>
<mn>0</mn>
</msub>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
</mrow>
</mfrac>
<mo>;</mo>
</mrow>
In formula：GPR(s) transmission function of PR adjusters, K are representedpRepresent proportional controller gain, KiRepresent that resonant controller increases
Benefit, n represent overtone order, ωcRepresent cutoff frequency, ω0Represent resonant frequency.
4. the control method of grid stimulating device according to claim 1, which is characterized in that the step 6 includes：Using
PID regulator controls current inner loop, while the feedforward control of three-phase given voltage, obtains three-phase output voltage modulated signal.
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| KR101410731B1 (en) * | 2013-02-13 | 2014-06-24 | 한국전기연구원 | Method for suppressing circulating currents from modular multi-level converter based high voltage direct-current system |
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| CN102570889A (en) * | 2011-01-04 | 2012-07-11 | 西华大学 | Three-phase four-leg inverter and control method thereof |
| KR101410731B1 (en) * | 2013-02-13 | 2014-06-24 | 한국전기연구원 | Method for suppressing circulating currents from modular multi-level converter based high voltage direct-current system |
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