CN107037290B - Testing method, device and system of grid-connected converter - Google Patents
Testing method, device and system of grid-connected converter Download PDFInfo
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Abstract
The invention discloses a testing method, a testing device and a testing system of a grid-connected converter. The test method comprises the following steps: setting a short-circuit capacity ratio test value of a grid-connected converter connected with a power grid, a grid-connected converter port voltage amplitude value and a grid-connected converter port voltage phase angle; calculating an adjustment value of a resistor and an adjustment value of a reactance connected between the grid-connected converter and a power grid according to the short-circuit capacity ratio test value, the amplitude of the port voltage of the grid-connected converter and the obtained rated power of the fan; and calculating an adjustment value of the amplitude of the voltage of the power grid and an adjustment value of the phase angle of the voltage of the power grid based on the adjustment value of the resistance, the adjustment value of the reactance, the amplitude of the voltage of the port of the grid-connected converter and the phase angle of the voltage of the port of the grid-connected converter. According to the testing method of the grid-connected converter provided by the embodiment of the invention, the stability of the voltage of the fan port can be ensured when the weak grid adaptability of the grid-connected converter is tested.
Description
Technical field
The present invention relates to the test methods of wind-powered electricity generation field more particularly to grid-connection converter, device and system.
Background technique
Currently, large-scale develop and utilize renewable energy opened up a new way to solve worldwide energy and environmental problem,
The wind-powered electricity generation energy is the renewable energy at present with large-scale commercial exploitation potential.Since collection is compared in wind-resources distribution in China's
In, Wind Power Generation uses mode that is extensive, high concentration access and transmit at a distance.On the one hand, wind power plant distribution height
It concentrates, region wind power output, that is, regional wind power shows very big fluctuation to the active power that power grid conveys and do not know
Property, it makes a big impact to power system stability, is restricted capacity of the wind-driven generator in power grid.On the other hand, exist
On a large scale, in the case where long-distance sand transport, when grid short circuit capacity becomes smaller, the dynamic between blower and between blower and power grid
Coupling enhancing, so that electric power system stability control becomes more complicated.
Grid-connection converter can reduce the impact that wind-power electricity generation direct grid-connected generates power grid in wind power system application, and
Inhibit wind power fluctuation.The uncertainty of power grid physical condition proposes the weak grid adaptability of grid-connection converter higher
It is required that and challenge.
When testing at present the weak grid adaptability of grid-connection converter, mainly by grid-connection converter and power grid
Between series reactance, change the equivalent capacity of short circuit of power grid.But when series reactance constantly increases, due on series reactance
Pressure drop increase, the port voltage of grid-connection converter gradually decreases, when further increasing series reactance, transducer port voltage
Setting value can be lower than, converter enters low voltage crossing control model, can not continue the test of weak grid adaptability.
Summary of the invention
The embodiment of the present invention provides test method, the device and system of grid-connection converter, is carrying out the grid-connected change of wind power system
When the weak grid adaptive testing of parallel operation, by adjusting the mode of series resistance and reactance, while the amplitude of network voltage is adjusted
And phase angle, guarantee the stabilization of blower port voltage.
One side according to an embodiment of the present invention provides a kind of test method of grid-connection converter, comprising: sets grid-connected change
Short circuit ratios test value, grid-connection converter port voltage amplitude and the grid-connection converter port voltage phase of parallel operation connection power grid
Angle；According to the blower rated power of Short circuit ratios test value, grid-connection converter port voltage amplitude and acquisition, grid-connected change is calculated
The adjusted value of the resistance connected between parallel operation and power grid and the adjusted value of reactance；The adjusted value of adjusted value, reactance based on resistance, simultaneously
Net transformation device port voltage amplitude and grid-connection converter port voltage phase angle calculate the adjusted value and power grid electricity of grid voltage amplitude
Press the adjusted value of phase angle.
According to another aspect of an embodiment of the present invention, a kind of test device of grid-connection converter is provided, comprising: test parameter
Setting module, for setting Short circuit ratios test value, the grid-connection converter port voltage amplitude of grid-connection converter connection power grid
With grid-connection converter port voltage phase angle；Resistance and reactance adjustment calculation module are used for according to Short circuit ratios test value, simultaneously
The blower rated power of net transformation device port voltage amplitude and acquisition calculates the tune of the resistance connected between grid-connection converter and power grid
The adjusted value of whole value and reactance；Voltage change computing module, the adjusted value, grid-connected for adjusted value, reactance based on resistance
Transducer port voltage magnitude and grid-connection converter port voltage phase angle, calculate the adjusted value and network voltage of grid voltage amplitude
The adjusted value of phase angle.
It is according to an embodiment of the present invention in another aspect, providing a kind of test macro of grid-connection converter, comprising: memory,
Processor, communication interface and bus；Memory, processor and communication interface are connected by bus and complete mutual communication；
Memory is for storing program code；Processor is run by reading the executable program code stored in memory and can be held
The corresponding program of line program code, with the test method for executing a kind of grid-connection converter, wherein the test of grid-connection converter
Method includes: to set the grid-connection converter connection Short circuit ratios test value of power grid, grid-connection converter port voltage amplitude and simultaneously
Net transformation device port voltage phase angle；According to Short circuit ratios test value, the blower of grid-connection converter port voltage amplitude and acquisition
Rated power calculates the adjusted value of the resistance connected between grid-connection converter and power grid and the adjusted value of reactance；Tune based on resistance
Whole value, the adjusted value of reactance, grid-connection converter port voltage amplitude and grid-connection converter port voltage phase angle calculate network voltage
The adjusted value of amplitude and the adjusted value of grid voltage phase-angle.
Test method, the device and system of grid-connection converter according to embodiments of the present invention simulate actual electric network environment,
The Short circuit ratios test for carrying out grid-connection converter, by adjusting the mode of series resistance and reactance, while adjusting network voltage
Amplitude and phase angle, grid short circuit capacity than constantly reduce when, maintain Wind turbines port voltage stablize, improve grid-connected change
The weak grid adaptive testing ability of parallel operation.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, will make below to required in the embodiment of the present invention
Attached drawing is briefly described, for those of ordinary skill in the art, without creative efforts, also
Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is the electrical block diagram for showing test grid-connection converter according to an embodiment of the present invention；
Fig. 2 is the flow chart for showing the test method of grid-connection converter according to an embodiment of the invention；
Fig. 3 is the equivalent circuit structure schematic diagram for showing the grid-connection converter of the embodiment of the present invention and connecting with power grid；
Fig. 4 is to show the single-phase vector schematic diagram of grid-connection converter according to an embodiment of the present invention；
Fig. 5 is the test method detail flowchart for showing the grid-connection converter of some exemplary embodiments according to the present invention；
Fig. 6 is to show the specific flow chart that fan end mouth apparent energy is calculated in Fig. 5；
Fig. 7 is to show the specific flow chart that grid voltage amplitude adjusted value and phase angle adjusted value are calculated in Fig. 5；
Fig. 8 is the structural schematic diagram of the test device of grid-connection converter according to an embodiment of the invention；
Fig. 9 is to show the specific structure of the test device of the grid-connection converter of some exemplary embodiments according to the present invention to show
It is intended to；
Figure 10 is the concrete structure schematic diagram for showing fan end mouth apparent energy in Fig. 9 and calculating unit；
Figure 11 is the concrete structure schematic diagram for showing voltage magnitude and phase calculation unit in Fig. 9；
Figure 12 be show the test method and device that grid-connection converter according to an embodiment of the present invention may be implemented and
The structure chart of the exemplary hardware architecture of the test macro of net transformation device.
In the accompanying drawings, identical component uses identical appended drawing reference, and description of symbols is as follows:
The test device of 800- grid-connection converter；810- test parameter setting module；820- resistance and reactance adjusted value meter
Calculate module；830- voltage change computing module；
821- grid short circuit capacity calculating unit；822- series equivalent reactance computing unit；823- resistance adjustment calculation
Unit；824- reactance adjustment calculation unit；
831- voltage controls target value acquiring unit；832- blower port apparent power meter calculates unit；833- blower port
Current calculation unit；834- voltage magnitude and phase calculation unit；
8321- induction reactance value computation subunit；8322- voltage vector obtains subelement；8323- active power and reactive power
Subelement；
8341- series equivalent reactance adjustment calculation subelement；
The test macro of 1200- grid-connection converter；1201- processor；1202- memory；1203- communication interface；1210-
Bus.
Specific embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below, in order to make mesh of the invention
, technical solution and advantage be more clearly understood, with reference to the accompanying drawings and embodiments, the present invention is further retouched in detail
It states.It should be understood that specific embodiment described herein is only configured to explain the present invention, it is not configured as limiting the present invention.
To those skilled in the art, the present invention can be real in the case where not needing some details in these details
It applies.Below the description of embodiment is used for the purpose of better understanding the present invention to provide by showing example of the invention.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence " including ... ", it is not excluded that including
There is also other identical elements in the process, method, article or equipment of the element.
Wind-electricity integration converter in the embodiment of the present invention can be referred to as grid-connected change in the description of following embodiments
Parallel operation.Grid-connection converter is wind-power electricity generation and the grid-connected key element of electric system, passes through grid-connection converter and adjusts injection power grid
Active power and reactive power, make wind power generating set and electric system realize efficiently, flexible interconnection.Therefore, it tests simultaneously
The weak grid adaptability of net transformation device,
Power control stability when being conducive to improve the operation of grid-connection converter weak grid.
In order to better understand the present invention, the grid-connected of wind generator system in the embodiment of the present invention is described below with reference to Fig. 1
The working principle of converter weak grid adaptive testing.Fig. 1 shows test grid-connection converter according to an embodiment of the present invention
Electrical block diagram.
As shown in Figure 1, the grid-connection converter in the embodiment of the present invention is connected by resistance R and reactance L with power grid, Ua、Ub、
UcFor the three-phase power grid voltage of voltage transformer real-time monitoring, ia、ib、icFor the power grid three-phase electricity of current transformer real-time monitoring
Stream, UconverterAnd θconverterFor the voltage magnitude and voltage phase angle of the grid-connection converter port of setting.
In embodiments of the present invention, the power of power grid can pass through grid short circuit capacity ratio (Short Circuit
Ratio, abbreviation SCR) it indicates.Test grid-connection converter weak grid adaptability when, by the three-phase power grid voltage signal of monitoring,
The three phase network current signal of monitoring and the voltage magnitude of grid-connection converter port and voltage phase angle are as grid-connection converter short circuit
Capacity than test test parameter input short capacity than control module SCR Control Module, SCR Control
Module can be supervised in real time by constantly reducing grid short circuit capacity ratio, and in the control target of combination blower port and power grid
The three-phase power grid voltage and three phase network electric current of survey adjust the resistance R between grid-connection converter and power gridscrWith reactance Lscr, simultaneously
Adjust grid voltage amplitude VscrWith grid voltage phase-angle θscr, to reach the mesh of test grid-connection converter weak grid adaptability
Mark.
Below in conjunction with attached drawing, be described in detail the test method of grid-connection converter according to an embodiment of the present invention, device and
System, it should be noted that these embodiments are not for limiting the scope of the present disclosure.
Fig. 2 is the flow chart for showing the test method of grid-connection converter according to an embodiment of the present invention.As shown in Fig. 2, this
The test method 100 of grid-connection converter in embodiment the following steps are included:
Step S110, Short circuit ratios test value, the grid-connection converter port voltage of setting grid-connection converter connection power grid
Amplitude and grid-connection converter port voltage phase angle.
Step S120, according to Short circuit ratios test value, the blower rated power and grid-connection converter port voltage of acquisition,
Calculate the adjusted value of the resistance connected between grid-connection converter and power grid and the adjusted value of the reactance connected between power grid.
Step S130, adjusted value, grid-connection converter port voltage amplitude and the grid-connected change of adjusted value, reactance based on resistance
Parallel operation port voltage phase angle, calculates the adjusted value of grid voltage amplitude and the adjusted value of grid voltage phase-angle.
The test method of grid-connection converter according to an embodiment of the present invention can set the survey of grid-connection converter Short circuit ratios
Examination value, and the voltage magnitude and voltage phase angle of the signal and grid-connection converter port in the power grid based on real-time monitoring calculate
The adjusted value of resistance and reactance is connected between grid-connection converter and power grid, and calculates grid voltage amplitude and grid voltage phase-angle
Adjusted value, to guarantee the voltage stabilization of blower port.
In some embodiments, the light current of grid-connection converter can be tested by constantly reducing Short circuit ratios test value
Net adaptability.
Below with reference to Fig. 3, when introducing the weak grid adaptability of test grid-connection converter, the test value and tune of Short circuit ratios
The logical relation of whole series reactance.Fig. 3 shows the equivalent electricity that grid-connection converter according to an embodiment of the present invention is connect with power grid
Line structure schematic diagram.
It, in embodiments of the present invention can will simultaneously as shown in figure 3, according to Thevenin's theorem (Thevenin ' s theorem)
Net transformation device is equivalent to voltage source U ∠ δ, wherein U indicates that the voltage magnitude of grid-connection converter, δ indicate the voltage of grid-connection converter
Phase angle；Power grid can be equivalent to voltage source V ∠ 0 simultaneously, wherein V indicates grid voltage amplitude, and 0 indicates grid voltage phase-angle.
Concatenated resistance R and reactance L can be equivalent to Thevenin's equivalence reactance Z between voltage source U ∠ δ and voltage source V ∠ 0.
In the following embodiments of the present invention, Thevenin's equivalence reactance Z is referred to as series reactance Z.
Two equivalent voltage sources in Fig. 3 are connected by concatenated resistance R and reactance L with power grid, due to indicate power transmission line,
The impedance of transformer and generator is mainly perception, it can thus be understood that two equivalent voltage sources pass through inductive reactance phase
It connects, i.e. Thevenin's equivalence reactance Z is an inductive reactance.
In some embodiments, grid short circuit capacity can be indicated by following formula:
In above-mentioned formula (1), U is grid-connection converter port voltage amplitude, ZmagConnect for Thevenin's equivalence reactance etc.
Reactance is imitated, S is grid short circuit capacity.
In some embodiments, the Short circuit ratios SCR that can be used for indicating power grid power can be calculated by following formula:
In above-mentioned formula (2), S is grid short circuit capacity, and P is blower rated power, SCR grid short circuit capacity ratio.
It is by above-mentioned formula (1) and formula (2) as can be seen that grid-connected to carry out in setting Short circuit ratios test value SCR
When converter weak grid adaptive testing, it can be counted according to the Short circuit ratios test value SCR of blower rated power P and setting
Calculation obtains grid short circuit capacity S；Further according to the grid-connection converter port voltage width of the grid short circuit capacity S being calculated and acquisition
Value can further calculate to obtain Thevenin's equivalence reactance Zmag。
Tie up grid-connection converter below with reference to Fig. 4 introduction by adjusting the amplitude and phase angle of the output voltage of grid-connection converter
Hold the principle of steady-working state.Fig. 4 shows the single-phase vector schematic diagram of grid-connection converter according to an embodiment of the present invention.
As shown in figure 4, wherein UaFor single-phase (such as A phase) bridge arm voltage of grid-connection converter, VaIndicate single-phase mains voltage, Ia
Indicate the monophase current of grid-connection converter output, series reactance of the Z between grid-connection converter and power grid, VaWith UaBetween angle δ
For generator rotor angle, VaWith IaBetween angleFor power-factor angle.
If voltage vector diagram as shown in Figure 4 can be seen that power-factor angleIt is constant, by adjusting grid-connection converter
Output voltage amplitude and phase angle, adjustable grid-connection converter output electric current size, to make grid-connection converter work
Make to realize the dynamic equilibrium for controlling the active power of entire wind generator system in stable state, realizes that system stablizes safety
Operation.
Fig. 5 is to show the test method detailed process of the grid-connection converter of some exemplary embodiments according to the present invention
Figure, step Fig. 5 identical or equivalent with Fig. 2 use identical label.
As shown in figure 5, in some embodiments, step S120 can specifically include:
Step S121, by the product of Short circuit ratios test value and blower rated power, as grid short circuit capacity.
It in this step, can be in conjunction with above-mentioned formula (2), by the grid short circuit capacity of setting than test value SCR and wind
Grid short circuit capacity S is calculated in the product of machine rated power P.
Step S122, by the ratio square with grid short circuit capacity of grid-connection converter port voltage amplitude, as power grid
Series equivalent reactance.
It in this step, can be in conjunction with above-mentioned formula (1), by square U for calculating grid-connection converter port voltage amplitude2
With the ratio of grid short circuit capacity S, the series equivalent reactance Z of power grid is obtainedmag。
Step S123, according between preset grid-connection converter and power grid X-bridge ratio and series equivalent reactance, meter
Calculate the adjusted value of resistance.
In some embodiments, the adjustment of the resistance connected between grid-connection converter and power grid can be calculated by following formula
Value:
In above-mentioned formula (3), RsourceFor the adjusted value of the resistance, ZmagFor series equivalent reactance, XrateIt is preset
X-bridge ratio between grid-connection converter and power grid, i.e., the reactance L connected between grid-connection converter and power grid and resistance R ratio.
In some embodiments, XrateFor constant, as an example, XrateIt can be with value for 10.
Step S124 utilizes the rated frequency of power grid, the adjusted value of X-bridge ratio and resistance, the adjustment of calculating reactance
Value.
In some embodiments, the adjustment of the reactance connected between grid-connection converter and power grid can be calculated by following formula
Value:
In above-mentioned formula (4), LsourceFor the adjusted value of reactance, RsourceFor the adjusted value of resistance, XrateIt is preset
X-bridge ratio, FreqFor the rated frequency of the power grid of acquisition.
With continued reference to Fig. 5, in some embodiments, step S130 be can specifically include:
Step S131 obtains wind according to the blower grid entry point reference voltage of grid-connection converter port voltage phase angle and acquisition
The control target value of machine port voltage.
In this step, the control target value of blower port voltage can be calculated by following formula:
In above-mentioned formula (5),For the control target value of blower port voltage, V_Base is the blower grid entry point obtained
Reference voltage,For unit radian, θconverterFor grid-connection converter port voltage phase angle,It is grid-connected
The radian value of transducer port voltage phase angle, cos indicate that cosine function, sin indicate SIN function,Indicate that real part is
And imaginary part isPlural number.
In some embodiments, the control target value of blower port voltage can be the voltage rating of blower port.
Step S132, power grid three-phase voltage, grid-connection converter port voltage amplitude, grid-connection converter port based on acquisition
The adjusted value of voltage phase angle and reactance calculates blower port apparent energy.
In some embodiments, as shown in fig. 6, the step of calculating fan end mouth apparent energy in step S132 specifically can be with
Include:
Step S1321 calculates the sense between grid-connection converter and power grid using the adjusted value of reactance and the rated frequency of power grid
Anti- value.
In this step, the induction reactance value between grid-connection converter and power grid can be calculated by following formula:
X=2 π FreqL (6)
In above-mentioned formula (6), induction reactance value of the X between grid-connection converter and power grid, L is the adjusted value of reactance, FreqFor electricity
The rated frequency of net.
Step S1322 obtains network voltage vector by power grid three-phase voltage, by grid-connection converter port voltage amplitude and simultaneously
Net transformation device port voltage phase angle obtains grid-connection converter voltage vector.
Step S1323, according to network voltage vector, grid-connection converter voltage vector, grid-connection converter voltage vector and electricity
Induction reactance value between the angle and power grid of net voltage vector calculates blower port active power and blower port reactive power.
Step S1324 obtains blower port view in function according to blower port active power and blower port reactive power
Rate.
In some embodiments, the apparent energy of grid-connection converter output can be indicated by following formula:
The blower port active power and fan end respectively indicated by available following two formula of above-mentioned formula (7)
Mouth reactive power:
In above-mentioned formula (7), formula (8) and formula (9), S is the apparent energy of grid-connection converter output, and P is blower
Port active power, Q are blower port reactive power,For network voltage vector,For grid-connection converter voltage vector, I* is
Grid-connection converter exports electric current, induction reactance value of the X between grid-connection converter and power grid, and δ is grid-connection converter voltage vector and power grid
Angle, that is, generator rotor angle of voltage vector.
Step S133 calculates blower port by the control target value of blower port apparent energy and blower port voltage
Electric current.
In this step, blower port current can be calculated by following formula:
In above-mentioned formula (10),For blower port current,For blower port apparent energy,For blower port voltage
Control target value.
Step S134 utilizes the adjusted value of resistance, the adjusted value of reactance, the control target value of blower port voltage and blower
Port current calculates the adjusted value of grid voltage amplitude and the adjusted value of grid voltage phase-angle.
Fig. 7 shows the specific flow chart that grid voltage amplitude adjusted value and phase angle adjusted value are calculated in Fig. 5.In some realities
It applies in example, as shown in fig. 7, step S134 can specifically include:
Step S1341, the adjusted value of adjusted value and reactance based on resistance are calculated and are connected between grid-connection converter and power grid
Imitate the adjusted value of reactance.
In this step, the adjusted value of series equivalent reactance can be calculated by following formula:
Z=Rresource+j2πFreqLresource (11)
In above-mentioned formula (11), Z is the adjusted value of series equivalent reactance, RresourceFor the adjusted value of resistance, Lresource
For the adjusted value of reactance, FreqFor the rated frequency of power grid.
Step S1342, according to the control target value of blower port voltage, the adjusted value of series equivalent reactance and blower port
Electric current calculates the adjusted value of grid voltage amplitude and the adjusted value of grid voltage phase-angle.
In this step, the line voltage of network voltage can be indicated by following formula first:
It can be by the line voltage of network voltage by above-mentioned formula (12)It is expressed as plural form, whereinFor
The control target value of blower port voltage,For blower port current, Z is the adjusted value of series equivalent reactance, Vreal+jVimagFor
The plural form of the line voltage of network voltage, and wherein, VrealFor the real part of the line voltage of network voltage, VimagFor power grid electricity
The imaginary part of the line voltage of pressure.
The adjusted value of grid voltage amplitude and the adjusted value of grid voltage phase-angle are calculated by following formula again:
In above-mentioned formula (13),For the modulus value of the line voltage of network voltage, VmagFor grid voltage amplitude
Adjusted value, VAngFor the adjusted value of grid voltage phase-angle.
The test method of grid-connection converter according to an embodiment of the present invention, real simulation actual electric network running environment, works as electricity
Net Short circuit ratios constantly reduce, can be by adjusting the mode of concatenated reactance and resistance, while adjusting the width of network voltage
Value and grid voltage phase-angle, to guarantee that Wind turbines port voltage keeps stablizing.
That is, the test method of grid-connection converter according to an embodiment of the present invention, when the capacity of short circuit of power grid changes
When, it is ensured that Wind turbines port voltage maintains voltage rating, so that the weak grid adaptability of grid-connection converter is tested, with
Power control stability when improving the operation of grid-connection converter weak grid.
With reference to the accompanying drawing, the test device of the grid-connection converter in the present invention is described in detail embodiment.Fig. 8 shows root
According to the structural schematic diagram of the test device of the grid-connection converter of the embodiment of the present invention.
As shown in figure 8, the test device 800 of the grid-connection converter in the embodiment of the present invention may include:
Test parameter setting module 810, for setting the Short circuit ratios test value, grid-connected of grid-connection converter connection power grid
Transducer port voltage magnitude and grid-connection converter port voltage phase angle.
Resistance and reactance adjustment calculation module 820, for according to Short circuit ratios test value, grid-connection converter port electricity
The blower rated power of pressure amplitude value and acquisition calculates the adjusted value of the resistance connected between grid-connection converter and power grid and connects with power grid
The adjusted value of the reactance connect.
Voltage change computing module 830, adjusted value, grid-connection converter end for adjusted value, reactance based on resistance
Mouth voltage magnitude and grid-connection converter port voltage phase angle, calculate the adjusted value of grid voltage amplitude and the tune of grid voltage phase-angle
Whole value.
The test device of grid-connection converter according to an embodiment of the present invention, setting grid-connection converter Short circuit ratios test
Value by adjusting resistance and reactance is connected between grid-connection converter and power grid, while adjusting grid voltage amplitude and network voltage phase
Angle, to guarantee the voltage stabilization of blower port.
The specific structure that Fig. 9 shows the test device of the grid-connection converter of some exemplary embodiments according to the present invention shows
It is intended to.Structure Fig. 9 identical or equivalent with Fig. 8 uses identical label.
As shown in figure 9, in some embodiments, resistance and reactance adjustment calculation module 820 can specifically include:
Grid short circuit capacity calculating unit 821, for making the product of Short circuit ratios test value and blower rated power
For grid short circuit capacity.
Series equivalent reactance computing unit 822, for by grid-connection converter port voltage amplitude square and grid short circuit
The ratio of capacity, the series equivalent reactance as power grid.
Resistance adjustment calculation unit 823, for according to the X-bridge ratio between preset grid-connection converter and power grid
With series equivalent reactance, the adjusted value of resistance is calculated.
In some embodiments, resistance adjustment calculation unit 823 specifically can be used for:
The adjusted value of resistance is calculated using above-mentioned formula (3), and in formula (3), RsourceFor the adjusted value of resistance,
ZmagFor series equivalent reactance, XrateFor X-bridge ratio.
Reactance adjustment calculation unit 824, the adjustment for rated frequency, X-bridge ratio and resistance using power grid
Value, the adjusted value of calculating reactance.
In some embodiments, reactance adjustment calculation unit 824 specifically can be used for:
Using the adjusted value of above-mentioned formula (4) calculating reactance, and in formula (4), LsourceFor the adjusted value of reactance,
RsourceFor the adjusted value of resistance, XrateFor X-bridge ratio, FreqFor the rated frequency of power grid.
In this embodiment, using the Short circuit ratios test value of setting, and grid-connection converter port electricity in power grid is obtained
Pressure, the rated frequency of power grid and preset X-bridge ratio export the adjustment of concatenated resistance between grid-connection converter and power grid
The adjusted value of value and concatenated reactance.
With continued reference to Fig. 9, in some embodiments, voltage change computing module 830 be can specifically include:
Voltage controls target value acquiring unit 831, for the blower according to grid-connection converter port voltage phase angle and acquisition
Grid entry point reference voltage obtains the control target value of blower port voltage.
In some embodiments, voltage control target value acquiring unit 831 specifically can be used for:
The control target value of blower port voltage is calculated using above-mentioned formula (5), and in formula (5),For blower
The control target value of port voltage, V_Base are blower grid entry point reference voltage,For unit radian, θconverterIt is grid-connected
Transducer port voltage phase angle,For the radian value of grid-connection converter port voltage phase angle, cos is cosine
Function, sin are SIN function,Table
Show that real part isAnd imaginary part isPlural number.
Blower port apparent power meter calculates unit 832, for the power grid three-phase voltage based on acquisition, grid-connection converter port
The adjusted value of voltage magnitude, grid-connection converter port voltage phase angle and reactance calculates blower port apparent energy.
Blower port current calculation unit 833, for passing through the control of blower port apparent energy and blower port voltage
Target value calculates blower port current.
In some embodiments, blower port current calculation unit 833 specifically can be used for:
Blower port current is calculated using above-mentioned formula (10), and in formula (10),For blower port current,For
Blower port apparent energy,For the control target value of blower port voltage.
Voltage magnitude and phase calculation unit 834, for utilizing the adjusted value of resistance, the adjusted value of reactance, blower port
The control target value and blower port current of voltage, calculate the adjustment of the adjusted value and grid voltage phase-angle of grid voltage amplitude
Value.
In this embodiment, the voltage magnitude and level angle of the grid-connection converter port based on setting, in conjunction with real-time prison
The adjusted value of grid voltage amplitude and the adjusted value of grid voltage phase-angle can be calculated in signal in the power grid of survey.
Figure 10 shows the concrete structure schematic diagram that fan end mouth apparent energy in Fig. 9 calculates unit.Phase in Figure 10 and Fig. 9
Same or equivalent structure uses identical label.
In some embodiments, as shown in Figure 10, blower port apparent power meter is calculated unit 832 and be can specifically include:
Induction reactance value computation subunit 8321 calculates grid-connected change for the rated frequency of adjusted value and power grid using reactance
Induction reactance value between parallel operation and power grid.
In some embodiments, induction reactance value computation subunit 8321 specifically can be used for calculating using following formula grid-connected
Induction reactance value between converter and power grid:
X=2 π FreqL (14)
In above-mentioned formula (14), induction reactance value of the X between grid-connection converter and power grid, L is the adjusted value of reactance, FreqFor
The rated frequency of power grid, π are constant.
In some embodiments, π can take 3.14 to represent pi and do approximate calculation.
Voltage vector obtains subelement 8322, for obtaining network voltage vector by power grid three-phase voltage, by simultaneously net transformation
Device port voltage amplitude and grid-connection converter port voltage phase angle obtain grid-connection converter voltage vector.
Active power and reactive power subelement 8323, for according to network voltage vector, grid-connection converter voltage vector,
Induction reactance value between grid-connection converter voltage vector and the angle and grid-connection converter and power grid of network voltage vector calculates fan end
Mouth active power and blower port reactive power.
In some embodiments, active power and reactive power subelement 8323 specifically can be used for:
Using above-mentioned formula (8) and formula (9) calculating blower port active power and blower port reactive power, and
In formula (8) and formula (9),For network voltage vector,For grid-connection converter voltage vector, X is grid-connection converter and electricity
Induction reactance value between net, δ are angle, that is, generator rotor angle of grid-connection converter voltage vector and network voltage vector, and P is that blower port is active
Power, Q are blower port reactive power.
Blower port apparent power meter calculates unit 832 specifically for idle according to blower port active power and blower port
Power obtains blower port apparent energy.
In some embodiments, blower port apparent power meter is calculated unit 832 and specifically be can be used for:
Blower port apparent energy is calculated using above-mentioned formula (7), whereinFor blower port apparent energy, P is blower
Port active power, Q are blower port reactive power.
Figure 11 shows the concrete structure schematic diagram of voltage magnitude and phase calculation unit in Fig. 9.Figure 11 is identical with Fig. 9
Or equivalent structure uses identical label.
As shown in figure 11, in some embodiments, voltage magnitude and phase calculation unit 834 can specifically include:
Series equivalent reactance adjustment calculation subelement 8341, for the adjusted value of adjusted value and reactance based on resistance,
Calculate the adjusted value of series equivalent reactance between grid-connection converter and power grid.
In some embodiments, series equivalent reactance adjustment calculation subelement 8341 is specifically used for utilizing above-mentioned formula
(11) adjusted value of series equivalent reactance is calculated, and in formula (11), Z is the adjusted value of series equivalent reactance, Rresource
For the adjusted value of resistance, LresourceFor the adjusted value of reactance, FreqFor the rated frequency of power grid.
Voltage magnitude and phase calculation unit 834 are also used to according to the control target value of blower port voltage, series equivalent
The adjusted value and blower port current of reactance, calculate the adjusted value of grid voltage amplitude and the adjusted value of grid voltage phase-angle.
In some embodiments, voltage magnitude and phase calculation unit 834 specifically can be used for:
Using the adjusted value of above-mentioned formula (12) calculating grid voltage amplitude and the adjusted value of grid voltage phase-angle, and
In formula (12),
For the line voltage of network voltage,For the control target value of blower port voltage,For blower port electricity
Stream, Z are the adjusted value of series equivalent reactance；
Vreal+jVimagFor the plural form of the line voltage of network voltage, and wherein, VrealFor the line voltage of network voltage
Real part, VimagFor the imaginary part of the line voltage of network voltage,For the modulus value of the line voltage of network voltage, VmagFor electricity
The adjusted value of net voltage magnitude, VAngFor the adjusted value of grid voltage phase-angle.
The test device of grid-connection converter according to an embodiment of the present invention, by adjusting the side of concatenated reactance and resistance
Formula, while the amplitude and grid voltage phase-angle of network voltage are adjusted, maintain Wind turbines port voltage to stablize.
The other details of the test device of grid-connection converter according to an embodiment of the present invention combine Fig. 1 to Fig. 7 to retouch with more than
The test method for the grid-connection converter according to an embodiment of the present invention stated is similar, and details are not described herein.
It can be simultaneously in conjunction with the test method and device of Fig. 1 to Figure 11 grid-connection converter according to an embodiment of the present invention described
The test macro of net transformation device is realized.Figure 12 is the hardware for showing the test macro of the grid-connection converter according to inventive embodiments
Structural schematic diagram.
As shown in figure 12, the test macro 1200 of the grid-connection converter in the present embodiment includes: processor 1201, memory
1202, communication interface 1203 and bus 1210, wherein processor 1201, memory 1202, communication interface 1203 pass through bus
1210 connect and complete mutual communication.
Specifically, above-mentioned processor 1201 may include central processing unit (CPU) or specific integrated circuit (ASIC),
Or it may be configured to implement one or more integrated circuits of the embodiment of the present invention.
Memory 1202 may include the mass storage for data or instruction.For example it rather than limits, storage
Device 1202 may include HDD, floppy disk drive, flash memory, CD, magneto-optic disk, tape or universal serial bus (USB) driver or
The combination of two or more the above.In a suitable case, memory 1202 may include can be removed or it is non-removable (or
It is fixed) medium.In a suitable case, memory 1202 can be in the inside of the test macro 1200 of grid-connection converter or outer
Portion.In a particular embodiment, memory 1202 is non-volatile solid state memory.In a particular embodiment, memory 1202 wraps
Include read-only memory (ROM).In a suitable case, the ROM can be the ROM of masked edit program, programming ROM (PROM), can
Wipe PROM (EPROM), electric erasable PROM (EEPROM), electrically-alterable ROM (EAROM) or flash memory or two or more
The combination of the above.
Communication interface 1203 is mainly used for realizing in the embodiment of the present invention between each module, device, unit and/or equipment
Communication.
Bus 1210 includes hardware, software or both, and the component of the test macro 1200 of grid-connection converter is coupled to each other
Together.For example it rather than limits, bus may include accelerated graphics port (AGP) or other graphics bus, enhancing industry mark
Quasi- framework (EISA) bus, front side bus (FSB), super transmission (HT) interconnection, Industry Standard Architecture (ISA) bus, infinite bandwidth
Interconnection, low pin count (LPC) bus, memory bus, micro- channel architecture (MCA) bus, peripheral component interconnection (PCI) bus,
PCI-Express (PCI-X) bus, Serial Advanced Technology Attachment (SATA) bus, Video Electronics Standards Association part (VLB) are total
The combination of line or other suitable buses or two or more the above.In a suitable case, bus 1210 can wrap
Include one or more buses.Although specific bus has been described and illustrated in the embodiment of the present invention, the present invention considers any suitable
Bus or interconnection.
That is, the test macro 1200 of grid-connection converter shown in Figure 12 may be implemented as including: processor
1201, memory 1202, communication interface 1205 and bus 1210.Processor 1201, memory 1202 and communication interface 1205 are logical
Bus 1210 is crossed to connect and complete mutual communication.Memory 1202 is for storing program code；Processor 1201 passes through reading
The executable program code stored in access to memory 1202 runs program corresponding with the executable program code, to be used for
Execute a kind of test method of grid-connection converter, wherein the test method of the grid-connection converter includes: that setting grid-connection converter connects
Short circuit ratios test value, grid-connection converter port voltage amplitude and the grid-connection converter port voltage phase angle to get access to grid；According to
Short circuit ratios test value, acquisition blower rated power and grid-connection converter port voltage, calculate grid-connection converter and power grid
Between the adjusted value of resistance that connects and the reactance connected between power grid adjusted value；The adjustment of adjusted value, reactance based on resistance
Value, grid-connection converter port voltage amplitude and grid-connection converter port voltage phase angle, calculate grid voltage amplitude adjusted value and
The adjusted value of grid voltage phase-angle.
The test macro 1200 of the grid-connection converter can be based on the voltage transformer and/or current transformer in power grid
Detect signal, and setting transducer port voltage magnitude and the relevant informations such as voltage phase angle execute in the embodiment of the present invention
Grid-connection converter test method, to realize test method and device in conjunction with Fig. 1 to Figure 11 grid-connection converter described,
And step S110-S130, step S121-S124, step S131-S134, step S1321-S1324 and step can be executed
S1341-S1542。
The test macro of grid-connection converter through the embodiment of the present invention simulates actual electric network environment, by adjusting series connection
Resistance and reactance, and the amplitude of network voltage and the mode of phase angle are adjusted, it realizes and does not enter the feelings of fault mode in Wind turbines
Under condition, Short circuit ratios test is carried out to grid-connection converter.
It should be clear that the invention is not limited to specific configuration described above and shown in figure and processing.
For brevity, it is omitted here the detailed description to known method.In the above-described embodiments, several tools have been described and illustrated
The step of body, is as example.But method process of the invention is not limited to described and illustrated specific steps, this field
Technical staff can be variously modified, modification and addition after understanding spirit of the invention, or suitable between changing the step
Sequence.
Functional block shown in structures described above block diagram can be implemented as hardware, software, firmware or their group
It closes.When realizing in hardware, it may, for example, be electronic circuit, specific integrated circuit (ASIC), firmware appropriate, insert
Part, function card etc..When being realized with software mode, element of the invention is used to execute program or the generation of required task
Code section.Perhaps code segment can store in machine readable media program or the data-signal by carrying in carrier wave is passing
Defeated medium or communication links are sent." machine readable media " may include any medium for capableing of storage or transmission information.
The example of machine readable media includes electronic circuit, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), soft
Disk, CD-ROM, CD, hard disk, fiber medium, radio frequency (RF) link, etc..Code segment can be via such as internet, inline
The computer network of net etc. is downloaded.
It should also be noted that, the exemplary embodiment referred in the present invention, is retouched based on a series of step or device
State certain methods or system.But the present invention is not limited to the sequence of above-mentioned steps, that is to say, that can be according in embodiment
The sequence referred to executes step, may also be distinct from that the sequence in embodiment or several steps are performed simultaneously.
The above description is merely a specific embodiment, it is apparent to those skilled in the art that,
For convenience of description and succinctly, the system, module of foregoing description and the specific work process of unit can refer to preceding method
Corresponding process in embodiment, details are not described herein.It should be understood that scope of protection of the present invention is not limited thereto, it is any to be familiar with
Those skilled in the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or substitutions,
These modifications or substitutions should be covered by the protection scope of the present invention.
Claims (12)
1. a kind of test method of grid-connection converter, which is characterized in that the test method includes:
Set the grid-connection converter connection Short circuit ratios test value of power grid, grid-connection converter port voltage amplitude and simultaneously net transformation
Device port voltage phase angle；
By the product of the Short circuit ratios test value and the blower rated power of acquisition, as grid short circuit capacity, and will
The ratio square with the grid short circuit capacity of the grid-connection converter port voltage amplitude, the series connection etc. as the power grid
Imitate reactance；
Calculate the X-bridge ratio between the preset grid-connection converter and the power grid square with 1 formed numerical value it
With, using the series equivalent reactance of the power grid square with the half power of the ratio of the sum of the numerical value as it is described simultaneously
The adjusted value of the resistance connected between net transformation device and the power grid, and, calculate the adjusted value and reactance electricity of the resistance
Hinder ratio product, the angular frequency of the power grid is determined according to the rated frequency of the power grid, by the adjusted value of the resistance with
The ratio of the angular frequency of the product and power grid of the X-bridge ratio, as between the grid-connection converter and the power grid
The adjusted value of the reactance of connection；
According to the blower grid entry point reference voltage of the grid-connection converter port voltage phase angle and acquisition, blower port voltage is obtained
Control target value, power grid three-phase voltage, the grid-connection converter port voltage amplitude, the grid-connection converter based on acquisition
The adjusted value of port voltage phase angle and the reactance calculates blower port apparent energy, passes through blower port apparent energy
With the control target value of the blower port voltage, blower port current is calculated, the adjusted value of the resistance, the reactance are utilized
Adjusted value, the blower port voltage control target value and the blower port current, calculate the tune of grid voltage amplitude
The adjusted value of whole value and grid voltage phase-angle.
2. test method according to claim 1, which is characterized in that described according to the grid-connection converter port voltage phase
The blower grid entry point reference voltage at angle and acquisition, obtains the control target value of blower port voltage, comprising: utilizes
Calculate the control target value of the blower port voltage, whereinFor the control target value of the blower port voltage, V_
Base is the blower grid entry point reference voltage,For unit radian, θconverterFor the grid-connection converter port voltage phase
Angle,For the radian value of the grid-connection converter port voltage phase angle, Indicate that real part isAnd imaginary part isPlural number.
3. test method according to claim 1, which is characterized in that the power grid three-phase voltage based on acquisition, described
The adjusted value of grid-connection converter port voltage amplitude, the grid-connection converter port voltage phase angle and the reactance calculates blower
Port apparent energy, comprising:
Using the adjusted value of the reactance and the rated frequency of the power grid, calculate between the grid-connection converter and the power grid
Induction reactance value；
Network voltage vector is obtained by the power grid three-phase voltage, by the grid-connection converter port voltage amplitude and described grid-connected
Transducer port voltage phase angle obtains grid-connection converter voltage vector；
According to the network voltage vector, the grid-connection converter voltage vector, the grid-connection converter voltage vector with it is described
The angle of network voltage vector and the induction reactance value calculate blower port active power and blower port reactive power；
According to blower port active power and blower port reactive power, blower port apparent energy is obtained.
4. test method according to claim 3, which is characterized in that
It is described using the adjusted value of the reactance and the rated frequency of the power grid, calculate the grid-connection converter and the power grid
Between induction reactance value, comprising:
Utilize X=2 π FreqL calculates the induction reactance value between the grid-connection converter and the power grid, wherein X is described and net transformation
Induction reactance value between device and the power grid, L are the adjusted value of the reactance, FreqFor the rated frequency of the power grid；
It is described according to the network voltage vector, the grid-connection converter voltage vector, the grid-connection converter voltage vector with
The angle of the network voltage vector and the induction reactance value calculate blower port active power and blower port reactive power, packet
It includes:
It utilizesCalculate blower port active power and the blower port without
Function power, whereinFor the network voltage vector,For the grid-connection converter voltage vector, X is described and net transformation
The induction reactance value between device and the power grid, δ are the angle of the grid-connection converter voltage vector and the network voltage vector,
P is blower port active power, and Q is blower port reactive power；
It is described according to blower port active power and blower port reactive power, obtain the blower port view in function
Rate, comprising:
It utilizesCalculate blower port apparent energy, whereinFor blower port apparent energy.
5. test method according to claim 1, which is characterized in that described to pass through blower port apparent energy and institute
The control target value of blower port voltage is stated, blower port current is calculated, comprising:
It utilizesThe blower port current is calculated, whereinFor the blower port current,For the fan end
Mouth apparent energy,For the control target value of the blower port voltage.
6. test method according to claim 1, which is characterized in that the adjusted value using the resistance, the electricity
The control target value of anti-adjusted value, the blower port voltage and the blower port current, calculate the network voltage width
The adjusted value of the adjusted value of value and the grid voltage phase-angle, comprising:
The adjusted value of adjusted value and the reactance based on the resistance, calculates and connects between the grid-connection converter and the power grid
The adjusted value of equivalent reactance；
According to the control target value of the blower port voltage, the adjusted value of the series equivalent reactance and blower port electricity
Stream, calculates the adjusted value of the grid voltage amplitude and the adjusted value of the grid voltage phase-angle.
7. test method according to claim 6, which is characterized in that the adjusted value and the electricity based on the resistance
Anti- adjusted value calculates the adjusted value of series equivalent reactance between the grid-connection converter and the power grid, comprising:
Utilize Z=Rresource+j2πFreqLresourceCalculate the adjusted value of the series equivalent reactance, wherein Z is described series connection etc.
Imitate the adjusted value of reactance, RresourceFor the adjusted value of the resistance, LresourceFor the adjusted value of the reactance, FreqFor the electricity
The rated frequency of net.
8. test method according to claim 6, which is characterized in that the control mesh according to the blower port voltage
Scale value, the series equivalent reactance adjusted value and the blower port current, calculate the adjusted value of the grid voltage amplitude
With the adjusted value of the grid voltage phase-angle, comprising:
It utilizesWith
Calculate the grid voltage amplitude adjusted value and
The adjusted value of the grid voltage phase-angle, wherein
For the line voltage of the network voltage,For the control target value of the blower port voltage,For the blower
Port current, Z are the adjusted value of the series equivalent reactance；
Vreal+jVimagFor the plural form of the line voltage of the network voltage, and wherein, VrealFor the line of the network voltage
The real part of voltage, VimagFor the imaginary part of the line voltage of the network voltage,For the line voltage of the network voltage
Modulus value, VmagFor the adjusted value of the grid voltage amplitude, VAngFor the adjusted value of the grid voltage phase-angle.
9. a kind of test device of grid-connection converter, which is characterized in that the test device includes:
Test parameter setting module, for setting Short circuit ratios test value, the grid-connection converter of grid-connection converter connection power grid
Port voltage amplitude and grid-connection converter port voltage phase angle；
Grid short circuit capacity calculating unit, for multiplying the blower rated power of the Short circuit ratios test value and acquisition
Product, as grid short circuit capacity；
Series equivalent reactance computing unit, for by the grid-connection converter port voltage amplitude square with the grid short circuit
The ratio of capacity, the series equivalent reactance as the power grid；
Resistance adjustment calculation unit, for calculating the X-bridge ratio between the preset grid-connection converter and the power grid
Square the sum of the numerical value formed with 1, by the series equivalent reactance of the power grid square with the ratio of the sum of the numerical value
Adjusted value of the half power as the resistance connected between the grid-connection converter and the power grid；
Reactance adjustment calculation unit, for calculating the adjusted value of the resistance and the product of the X-bridge ratio, according to
The rated frequency of the power grid determines the angular frequency of the power grid, by the adjusted value of the resistance and the X-bridge ratio
The ratio of the angular frequency of product and the power grid, the adjustment as the reactance connected between the grid-connection converter and the power grid
Value；
Voltage controls target value acquiring unit, grid-connected for the blower according to the grid-connection converter port voltage phase angle and acquisition
Point reference voltage, obtains the control target value of blower port voltage；
Blower port apparent power meter calculates unit, for power grid three-phase voltage, grid-connection converter port electricity based on acquisition
The adjusted value of pressure amplitude value, the grid-connection converter port voltage phase angle and the reactance calculates blower port apparent energy；
Blower port current calculation unit, for the control by blower port apparent energy and the blower port voltage
Target value calculates blower port current；
Voltage magnitude and phase calculation unit, for utilizing the adjusted value of the resistance, the adjusted value of the reactance, the blower
The control target value of port voltage and the blower port current, calculate the adjusted value and grid voltage phase-angle of grid voltage amplitude
Adjusted value.
10. test device according to claim 9, which is characterized in that blower port apparent power meter calculates unit packet
It includes:
Induction reactance value computation subunit, for the rated frequency of adjusted value and the power grid using the reactance, calculating is described simultaneously
Induction reactance value between net transformation device and the power grid；
Voltage vector obtains subelement, for obtaining network voltage vector by the power grid three-phase voltage, by described and net transformation
Device port voltage amplitude and the grid-connection converter port voltage phase angle obtain grid-connection converter voltage vector；
Active power and reactive power subelement, for according to the network voltage vector, the grid-connection converter voltage vector,
The angle and the induction reactance value of the grid-connection converter voltage vector and the network voltage vector, calculate blower port wattful power
Rate and blower port reactive power；
Blower port apparent power meter is calculated unit and is also used to according to blower port active power and the blower port
Reactive power obtains blower port apparent energy.
11. test device according to claim 9, which is characterized in that the voltage magnitude and phase calculation unit include:
Series equivalent reactance adjustment calculation subelement, for the adjusted value of adjusted value and the reactance based on the resistance,
Calculate the adjusted value of series equivalent reactance between the grid-connection converter and the power grid；
The voltage magnitude and phase calculation unit are also used to the control target value according to the blower port voltage, the series connection
The adjusted value of equivalent reactance and the blower port current calculate the adjusted value and the network voltage of the grid voltage amplitude
The adjusted value of phase angle.
12. a kind of test macro of grid-connection converter, which is characterized in that the test macro includes:
Memory, processor, communication interface and bus；
The memory, the processor are connected by the bus with the communication interface and complete mutual communication；
The memory is for storing program code；
The processor is run and the executable program by reading the executable program code stored in the memory
The corresponding program of code, with the test method for executing a kind of grid-connection converter, wherein the test side of the grid-connection converter
Method includes:
Set the grid-connection converter connection Short circuit ratios test value of power grid, grid-connection converter port voltage amplitude and simultaneously net transformation
Device port voltage phase angle；
By the product of the Short circuit ratios test value and the blower rated power of acquisition, as grid short circuit capacity, and will
The ratio square with the grid short circuit capacity of the grid-connection converter port voltage amplitude, the series connection etc. as the power grid
Imitate reactance；
Calculate the X-bridge ratio between the preset grid-connection converter and the power grid square with 1 formed numerical value it
With, using the series equivalent reactance of the power grid square with the half power of the ratio of the sum of the numerical value as it is described simultaneously
The adjusted value of the resistance connected between net transformation device and the power grid, and, calculate the adjusted value and reactance electricity of the resistance
Hinder ratio product, the angular frequency of the power grid is determined according to the rated frequency of the power grid, by the adjusted value of the resistance with
The ratio of the angular frequency of the product and power grid of the X-bridge ratio, as between the grid-connection converter and the power grid
The adjusted value of the reactance of connection；
According to the blower grid entry point reference voltage of the grid-connection converter port voltage phase angle and acquisition, blower port voltage is obtained
Control target value, power grid three-phase voltage, the grid-connection converter port voltage amplitude, the grid-connection converter based on acquisition
The adjusted value of port voltage phase angle and the reactance calculates blower port apparent energy, passes through blower port apparent energy
With the control target value of the blower port voltage, blower port current is calculated, the adjusted value of the resistance, the reactance are utilized
Adjusted value, the blower port voltage control target value and the blower port current, calculate the tune of grid voltage amplitude
The adjusted value of whole value and grid voltage phase-angle.
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