CN108414831A - Study the experimental provision and method of high permeability New-energy power system - Google Patents
Study the experimental provision and method of high permeability New-energy power system Download PDFInfo
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Abstract
The invention discloses the experimental provisions and method of a kind of research high permeability New-energy power system for belonging to New-energy power system technical field.The experimental provision is made of driving power and MGP systems, and driving power is connected with MGP systems and local load respectively, and MGP systems connect power grid and load；Wherein the synchronous motor of MGP systems is connected by being mechanically connected with synchronous generator, and for composition synchronous motor to being connected to the grid by grid-connected end, MGP systems further include measuring device, are connected to synchronous motor to measurement point；The method includes：Study the parallel running of more transverters in high permeability New-energy power system；The inertia and frequency stability of research system, the harmonic wave of voltage stability, small interference stability and damping, transient rotor angle stability, MGP system grid connections and off-network characteristic, new energy.The present invention provides a kind of effective experimental provision and method for research high permeability New-energy power system, it can also be used to study the series of characteristics of the electric system of height power electronics.
Description
Technical field
The invention belongs to New-energy power system technical field more particularly to a kind of research high permeability new energy electric power systems
The experimental provision and method of system.
Background technology
It is reduced in face of fossil energy and the dual-pressure of environmental pollution, utilization regenerative resource optimizes and revises energy knot
Structure has become the direction of promotion global energy-economics-environmental sustainable development.People are generally new energy electric power in power grid
System proportion is known as the permeability of new energy electric power, and in the present invention, high permeability power grid refers to having high proportion new energy
The network system of electric power access, low-permeability power grid refer to the network system of only low ratio new energy electric power access.People are
It is arrived through passing through practice knowledge, the performance of the network system of the network system of low-permeability and zero permeability is relatively, and hypertonic
The saturating network system of rate and the network system of zero permeability have very big difference, need conscientiously to be studied.With it is traditional with
Electric system based on synchronous generator is different, and high permeability New-energy power system has used a large amount of electronic power inversion
The power electronic equipments such as device, frequency converter, transverter keep the stable operation of system to become difficult or extremely difficult, thus
Result in it is serious abandon wind, abandon optical issue, be also unfavorable for the consumption and transmission of new energy, be mainly reflected in the following aspects：
One, the inertia of power electronic equipment is very low, is not enough to the frequency stability of maintenance system, is not enough to support grid strength；Two, electric
The frequency-tolerant energy force difference of power electronic device can lead to the extensive off-grid of new energy if frequency anomaly caused by failure is excessive；
Three, the voltage tolerance of power electronic equipment is poor, and new energy is easy off-grid extensive due to transient overvoltage；Four, electric power
Electronic device causes midband (5~300Hz) new stable problem, causes subsynchronous and supersynchronous oscillation；Five, a large amount of power electronics
The problems such as control parameter coordinating and setting that will produce circulation and parallel running when device parallel running, can cause high permeability new
Energy grid stability reduces, and increases generation of electricity by new energy field off-grid probability.Therefore high permeability New-energy power system is carried out
Experimental study is very necessary.Nearly all it is both at home and abroad at present simulation study to the research of New-energy power system, and emulates
In new energy permeability it is not high, the permeability especially in terms of the experimental system research of high permeability electric system is almost
Zero, also almost without the permeability more than 50%, 100% permeability of distance also differs current high permeability power system simulation model
It is very remote.In particular, the research in terms of the experiment of high permeability electric system is almost nil, above-mentioned simulation study is due to can not be into
Row experimental verification and seem that convincingness is limited.Therefore, the effective research high permeability electric system of structure one is needed at present
Experimental provision.
Invention content
In view of the above-mentioned problems, the present invention provides a kind of experimental provision of research high permeability New-energy power system and sides
Method, which is characterized in that
A kind of experimental provision of research high permeability New-energy power system, including：Driving power 1 and MGP systems 2；
The driving power 1 is connected with MGP systems 2 and local load 5, the MGP systems 2 and 4 phases of power grid 3 and load
Connection；
The driving power 1 is that the true photovoltaic generation of simulation and the simulation system or photovoltaic of wind-power electricity generation characteristic, wind-powered electricity generation are new
The real system of the energy；
When driving power 1 be simulation system when, by several power electronic equipments in parallel with 2 phase of MGP systems
Even, common to drive MGP systems 2, wherein each power electronic equipment is made of power supply and transverter；The power supply is direct current
Source or AC power, transverter are inverter or frequency converter；
When driving power 1 is real system, which is the wind generator system that wind turbine and transverter are constituted,
Or the energy-storing and power-generating system that the photovoltaic generating system or battery and transverter of photovoltaic power generation plate and transverter composition are constituted, or on
State the various combination of electricity generation system.
The MGP systems 2 are by source 201, synchronous motor 202, mechanical connection 203, synchronous generator 204, grid-connected end
205 and measuring device 206 form,
Wherein, one end of synchronous motor 202 is connected with source 201, and the other end passes through mechanical connection 203 and synchronous generator
Machine 204 is connected, and synchronous motor 202 and synchronous generator 204 form synchronous motor pair, and 3 are connected to the grid by grid-connected end 205,
The mechanical connection 203 is used for 205 electrical isolation of source 201 and grid-connected end；The measuring device 206 and synchronous motor pair
Measurement point a and measurement point b connections, for measuring voltage, electric current, power, frequency, rotating speed, torque, generator rotor angle and harmonic series system characteristic
Parameter.
A kind of experimental method of research high permeability New-energy power system, the experimental method are：
(1) stability of high permeability New-energy power system, including research high permeability New-energy power system are studied
In the parallel running of more transverters, the inertial supports of system and frequency stabilization, voltage stabilization, small interference stability and damping, transient state
Angle stability and MGP system grid connections and off-grid operation characteristic；
(2) harmonic wave for studying high permeability New-energy power system is as follows described：
1) driving power is directly incorporated into power grid, the harmonic voltage or harmonic current of a points is measured using measuring device, is obtained
Driving power output harmonic wave content when without any be filtered；
2) it is connected to the grid after filtering the filtered device of electric energy that driving power exports, measuring device is utilized to measure a points
Harmonic voltage or harmonic current obtain the filtered harmonic content of the filtered device of driving power；
3) electric energy that driving power exports is connected to the grid by MGP systems, the harmonic wave electricity of b points is measured using measuring device
Pressure or harmonic current, obtain harmonic content of the driving power after MGP system filters；
4) above-mentioned measurement data, the subsynchronous and supersynchronous harmonic wave that research driving power generates, by comparing step are based on
2) and step 3) is to the filter effect of harmonic wave, the method that research promotion MGP systems inhibit subsynchronous and supersynchronous harmonic wave.
The parallel runnings of more transverters further includes in the research high permeability New-energy power system：More transverters are simultaneously
Import the assemblage method of source after connection jointly, power coordination distribution control when more transverter parallel drive synchronous motors,
Circulation control and parameter coordination in parallel between more transverters are adjusted.
The inertial supports for studying high permeability New-energy power system and frequency stabilization further include：System bringing onto load is real
It tests and system grid connection is tested, when the system experiments with burden is used to study load sudden change, the output frequency of synchronous generator
Variation characteristic and the inertia influence that frequency dynamic is changed that provides of MGP systems；The system grid connection experiment, for grinding
When studying carefully driving power mutation, the variation characteristic of the output frequency of synchronous generator.
It is described research high permeability New-energy power system voltage stabilization further include：System grid connection is tested, by electricity
Low-voltage, the operating mode of high voltage and failure, supporting role of the research synchronous generator to grid-connected terminal voltage are set in net.
The small interference stability of the research high permeability New-energy power system and damping further include：System grid connection test and
Experiments with burden, by the way that load variation, the different types of failure of short circuit, setting and synchronous motor and synchronous generator is arranged
Excitation con-trol pattern studies small signal stability.
It is described research high permeability New-energy power system transient rotor angle stability further include：After breaking down in power grid,
The ability of the response of transient state generator rotor angle and holding synchronous operation of synchronous motor and synchronous generator under the different faults mute time.
The research high permeability new energy grid-connected and off-grid operation characteristic that passes through MGP systems further includes：Driving power
When being run with MGP system grid connections, stability when driving power and bearing power fluctuate and driving power band local load fortune
When row, stability when local load power fluctuates.
The beneficial effects of the present invention are：
The experimental provision and method of a kind of research high permeability New-energy power system proposed by the present invention, can be by same
It is grid-connected to system (Motor-Generator Pair, MGP) to walk motor, to provide New-energy power system required inertia.
After grid-connected system connects driving power, constitute a kind of test research device, the device can not only study more transverters and
Through transport row, the inertia and frequency stability of high permeability New-energy power system, voltage stability, small interference stability and damping,
The problems such as transient rotor angle stability, MGP system grid connections and harmonic wave of off-network characteristic and new energy, can also study height power electronics
The series of characteristics of the electric system of change provides a kind of effective experimental provision and method for research high permeability electric system.
Description of the drawings
Attached drawing 1 is research high permeability New-energy power system experimental provision structural schematic diagram；
Attached drawing 2 is the experimental provision that high permeability New-energy power system stability is studied in embodiment 1；
Attached drawing 3 is the experimental provision that high permeability New-energy power system harmonic wave is studied in embodiment 2；
Attached drawing 4 is the true generation of electricity by new energy device that high permeability New-energy power system is studied in embodiment 3；
Attached drawing 5 is in embodiment 4 without the grid-connected simulation model locally loaded；
Attached drawing 6 is in embodiment 4 without the grid-connected simulation result diagram locally loaded；
Reference numeral：
1- driving powers, 2-MGP systems, 3- power grids, 4- loads, the locals 5- load, 6- switches 1,7- switches 2,8- switches
3,9- filters, 10- switches 4,11- switches 5,12- switches 6,13- inductance, 14- infinity simulated grids；
101- power supplys, 102- transverters, 103- wind turbines, 104- photovoltaic power generation plates, 105- batteries, 106- DC power supplies,
107- inverters；
201- sources, 202- synchronous motors, 203- mechanical connections, 204- synchronous generators, the grid-connected ends 205-, 206- are surveyed
Measure device；
Specific implementation mode
The present invention is described in detail with reference to the accompanying drawings and examples.
Attached drawing 1 is research high permeability New-energy power system experimental provision structural schematic diagram, as shown in Figure 1, the experiment
Device is made of driving power 1 and MGP systems 2, and the driving power 1 is connected with MGP systems 2 and local load 5, described
MGP systems 2 are connected with power grid 3 and load 4；The driving power 1 is the true photovoltaic generation of simulation and wind-power electricity generation characteristic
The real system of the new energy such as simulation system or photovoltaic, wind-powered electricity generation；When driving power 1 is simulation system, by several electric power electricity
Sub-device is connected with MGP systems 2 in parallel, common to drive MGP systems 2, wherein each power electronic equipment is by power supply
It is formed with transverter；The power supply is DC power supply or AC power, and transverter is inverter or frequency converter；When driving power 1
For real system when, which is the wind generator system that wind turbine and transverter are constituted or photovoltaic power generation plate and transverter
The various combination of energy-storing and power-generating system or above-mentioned electricity generation system that the photovoltaic generating system or battery and transverter of composition are constituted.
For the MGP systems 2 there are two port, one end is referred to as source 201, connection driving power 1 and local load 5, another
End is referred to as grid-connected end 205, connection power grid 3 and load 4；The MGP systems 2 further include synchronous motor 202, mechanical connection 203,
Synchronous generator 204 and measuring device 206, wherein one end of synchronous motor 202 is connected with source 201, and the other end passes through machine
Tool connection 203 is connected with synchronous generator 204, and synchronous motor 202 and synchronous generator 204 form synchronous motor pair, pass through
Grid-connected end 205 is connected to the grid 3, and the mechanical connection 203 also acts the work of the electrical isolation by source 201 and grid-connected end 205
With；The measuring device 206 is coupled by the measurement point of measurement point a and measurement point b or more, for measuring voltage, electric current, work(
The system performances parameter such as rate, frequency, rotating speed, torque, generator rotor angle and harmonic wave.
Wherein, the parameter of synchronous motor 202 and synchronous generator 204 is：Rated voltage 400V~20kV；It is specified active
Power 2kW~200kW；Rated speed 1500r/min or 3000r/min；Inertia time constant 0.5~3.5.
Load 4 parameter be：Rated voltage 400V~20kV；Rated active power 2kW~200kW.
The parameter of power supply 101 and transverter 102 is：Rated output voltage 400V~1000V；Output-current rating 0.5A~
5A；Rated output frequency 50Hz.
The parameter of local load 5 is：Rated voltage 400V~1000V；Rated active power 1kW~100kW.
The parameter of power grid 3 is：Rated voltage 220V；Rated frequency 50Hz.
Embodiment 1
Attached drawing 2 is the experimental provision for studying high permeability New-energy power system stability, as shown in Fig. 2, the experiment fills
It sets and is made of driving power 1 and MGP systems 2, the source 201 of the MGP systems 2 connects driving power 1 and local load 5, and
It nets end 205 and connects power grid 3 and load 4；The MGP systems 2 further include synchronous motor 202, mechanical connection 203, synchronous generator
Machine 204 and measuring device 206, wherein one end of synchronous motor 202 is connected with source 201, and the other end passes through mechanical connection
203 are connected with synchronous generator 204, and synchronous motor 202 and synchronous generator 204 form synchronous motor pair, pass through grid-connected end
205 are connected to the grid 3, and the mechanical connection 203 also acts the effect of the electrical isolation by source 201 and grid-connected end 205, measures
Device 206 couples the measurement point of measurement point a and measurement point b or more, for measuring voltage, electric current, power, frequency, rotating speed, turning
The system performances parameter such as square, generator rotor angle and harmonic wave；The driving power 1 is to simulate true photovoltaic generation by power electronic equipment
With the simulation system of the new energy such as photovoltaic, the wind-powered electricity generation of the characteristic of wind-power electricity generation, the driving power 1 is by several power electronic equipments
1~n is formed, and 1~n of several power electronic equipments imports the source 201 of MGP systems 2 in parallel, and driving power 1 is driven
Synchronous motor 202 in dynamic MGP systems 2, synchronous motor 202 is by 203 driving synchronous generator 204 of mechanical connection, together
Step generator 204 is connected to the grid 3；Wherein, 1~n of several power electronic equipments is made of power supply 101 and transverter 102, institute
It can be DC power supply or AC power to state power supply 101, and transverter 102 can be inverter or frequency converter.As shown in Fig. 2, should
System is the small grids for realizing electrical isolation by mechanical connection 203 with power grid 3, and power supply is used as by driving power 1,
MGP systems 2 can carry local load 5 as load.Since whole energy of the system are all that 1~n of power electronic equipment is carried
It supplies, it can be considered that this is electric system and height power electronics of the new energy permeability close to 100%
Electric system.Therefore the system, which is one, can study the experimental model that new energy permeability reaches 100% power grid.Based on this
One model of sample, can be studied as follows：
(1) parallel running of more transverters in high permeability New-energy power system is studied
Pass through closure switch 6 and switch 7, you can study the remittance for importing source 201 after more new energy inverter parallels jointly
Poly- method, circulation inhibition method and multi-inverter parallel parameter coordination setting method.It is described that the specific method is as follows：
Step 1：MGP systems 2 are driven using power electronic equipment 1, when MGP systems 2 are close to synchronous speed, closure switch 7,
MGP systems 2 are made to be connected to the grid 3；
Step 2：After stable operation, 2~n of power electronic equipment is incorporated to source 201 one by one, each power electronics dress is set
The initial output power set is zero；
Step 3：The output power reference value for changing 1~n of power electronic equipment measures electric power electricity using measuring device 206
The output power of 1~n of sub-device and the grid-connected output power of MGP systems 2, and compare；
Step 4：By studying the coordination control ability of 1~n of power electronic equipment, realize that active power is filled in power electronics
Set the reasonable distribution in 1~n.
(2) inertial supports and frequency stabilization of high permeability New-energy power system are studied
The inertial supports and frequency stabilization of the research high permeability New-energy power system, including research high permeability are new
The energy be connected to the grid by MGP systems 23 inertial supports and frequency stabilization, and research high permeability new energy pass through MGP systems
It unites the inertial supports and frequency stabilization of 2 bringing onto loads 4.Specific research approach is as described below：
1) when study high permeability new energy be connected to the grid by MGP systems 23 inertial supports and frequency stabilization when, it is first
First disconnect switch 6 and switch 8, system is connected to the grid 3, since the chugging of driving power 1 can cause work(by closure switch 7
Rate is uneven, thus the output frequency of the system can change, and using the output frequency of 206 measuring system of measuring device, obtain
To system output frequency variation curve；Then driving power 1 is directly incorporated into power grid 3, the chugging of driving power 1 equally can
Cause unbalanced power, the output frequency of driving power 1 that can change, the defeated of driving power 1 is measured using measuring device 206
Go out frequency, obtains the output change curve of driving power 1.This two curves are just compared, for illustrating MGP systems 2
Influence of the inertia to the different inertia magnitudes of castering action and MGP systems 2 of frequency stability to frequency stability；
2) when studying inertial supports and frequency stabilization of the high permeability new energy by 2 bringing onto load 4 of MGP systems, first
Switch 6 and switch 7 are disconnected, system access is loaded 4 by closure switch 8, since the chugging of load 4 can cause power uneven
Weighing apparatus, thus the output frequency of the system can change, and using the output frequency of 206 measuring system of measuring device, obtain system
Output frequency change curve；Then driving power 1 is directly connected to local load 5, since the chugging of local load 5 is same
It can cause unbalanced power, the output frequency of driving power 1 that can also change, driving power 1 is measured using measuring device 206
Output frequency, obtain the output frequency change curve of driving power 1.This two curve progress can be compared, for illustrating
The inertia of MGP systems 2 is to the castering action of frequency stability and the different inertia magnitudes of MGP systems 2 to the shadow of frequency stability
It rings.
(3) voltage stabilization of high permeability New-energy power system is studied
The voltage stabilization of the research high permeability New-energy power system, including research high permeability new energy pass through
MGP systems 2 be connected to the grid 3 voltage stabilization, and research high permeability new energy it is steady by the voltage of 2 bringing onto load 4 of MGP systems
Fixed, specific research approach is as described below：
1) when study high permeability new energy be connected to the grid by MGP systems 23 voltage stabilization when, first disconnect 6 He of switch
System is connected to the grid 3, all kinds of failures is arranged in power grid 3 by switch 8, closure switch 7, respectively so that grid-connected end 205 after failure
Voltage decline and rise, when grid-connected end 205 voltage decline when, design driven power supply 1, synchronous motor 202 and it is synchronous send out
The control method for coordinating of motor 204 designs the excitation control method of synchronous generator 204, studies the low electricity of synchronous generator 204
Ride-through capability, research and utilization MGP systems 2 is pressed to promote the control method of low voltage ride-through capability；When the voltage at grid-connected end 205 rises
When, design driven power supply 1, synchronous motor 202 and synchronous generator 204 control method for coordinating, design synchronous generator 204
Excitation control method, study synchronous generator 204 high voltage tolerance, research high permeability new energy power grid how to answer
The problem of to transient overvoltage；
2) when studying voltage stabilization of the high permeability new energy by 102 bringing onto load 119 of MGP systems, 6 He of switch is disconnected
Switch 7, closure switch 8, by system access load 4, due to load 4 mutation can cause grid-connected end 205 voltage rising or under
Drop, at this point, the control method for coordinating of design driven power supply 1, synchronous motor 202 and synchronous generator 204, designs synchronous generator
The excitation control method of machine 204, studies the high voltage and low-voltage tolerance of synchronous generator 204, and research high permeability is new
How energy power grid copes with the problem of 4 spread of voltage of load.
(4) small interference stability of research high permeability New-energy power system and damping, specifically include following steps：
1) switch 6 and switch 7 are disconnected, system access is loaded 4 by closure switch 8；
2) actual parameter of system is combined, theorize analysis model, and analysis model includes driving power 1, MGP systems
2 and load 4；
3) it utilizes analysis model to carry out theoretical calculation, to loading 4 different chugging amounts, calculates the frequency at grid-connected end 205
Rate response curve measures the rotating speed response curve of MGP systems 2 with measuring device 206；
4) the load disturbance experiment for carrying out system bringing onto load 4 measures grid-connected end 205 to loading 4 different chugging amounts
Frequency response curve, the rotating speed response curve of MGP systems 2 is measured with measuring device 206；
5) comparison step 3) the model calculation and step 4) disturbance experiments as a result, revised theory analysis model essence
Degree, obtains more accurately theoretical analysis model.On this basis, design driven power supply 1, synchronous motor 202 and synchronous hair
The control method for coordinating of motor 204 designs the excitation control method of synchronous generator 202, improves small signal stability；
6) respectively in automatic magnetic exciting and under determining two kinds of operating modes of excitation, and in 2 zero load of MGP systems and bringing onto load 4, profit
The input voltage and input current of source 201, the voltage at grid-connected end 205 and encouraging for MGP systems 2 are measured with measuring device 206
Magnetoelectricity stream and rotating speed, research different exciting control are capable of providing the size of damping and the influence to small interference stability.
(5) transient rotor angle stability for studying high permeability New-energy power system, specifically includes following steps：
1) switch 6 and switch 8, closure switch 7, by system access power grid 3 are disconnected；
2) short trouble is set in power grid 3, and failure is eliminated over time, is measured simultaneously using measuring device 206
Calculate the generator rotor angle response curve of synchronous motor 202 and synchronous generator 204；
3) excitation control method of design MGP systems 2 so that system can ensure that generator rotor angle is steady after power grid 3 breaks down
Qualitative and synchronous operation.
(6) grid-connected and off-grid operation characteristic of the high permeability new energy by MGP systems 2 is studied, specific research approach is such as
It is lower described：
1) when the grid-connected characteristic of high permeability New-energy power system of the research with local load 5,6 He of closure switch
Switch 7 disconnects switch 8, by 4 access systems of local load 5 and load, since source 201 contains driving power 1, MGP systems
2 synchronous motor 202 and local load 5, thus the new energy permeability of the system is 100%.It, can be with based on the above power grid
Study the tidal current computing method of 100% permeability power grid, 100% New-energy power system when all kinds of variations occurs for local load
When the stability of 100% New-energy power system and transmission line break down when stability, new energy power swing,
The stability of 100% New-energy power system.
2) when the off-network characteristic of high permeability New-energy power system of the research with local load 5, closure switch 6,
Switch 7 and switch 8 are disconnected, by 5 access system of local load.When off-network, the new energy permeability of the system is 100%.It is based on
The above power grid, when can study local load 5 all kinds of variations occur, the stability of 100% New-energy power system, new energy work(
100% New-energy power system when the stability of 100% New-energy power system and transmission line break down when rate fluctuates
Stability.
Embodiment 2
Attached drawing 3 is the experimental provision for studying high permeability New-energy power system harmonic wave, as shown in figure 3, the device is by driving
Dynamic power supply 1 and MGP systems 2 form, the driving of the device different from the attached research experimental provision of system stability shown in Fig. 2
Power supply 1 is made of 1 power electronic equipment, and the grid-connected end 205 of MGP systems 2 is connect with power grid 3；The connection driving electricity of source 201
Source 1 and filter 9, the filter 9 are made of inductance and capacitance, and filter 9 is connected by switch 10 and transverter 102, are surveyed
Measure the measurement point connection that device 206 connects measurement point a and measurement point b or more, for measure voltage, electric current, power, frequency,
The system performances parameter such as rotating speed, torque, generator rotor angle and harmonic wave.Based on experimental provision shown in Fig. 3, the new energy of high permeability can be carried out
The research of source Harmonious Waves in Power Systems.Specific research approach is as described below：
1) switch 10, closure switch 11 and switch 12 are disconnected, power electronic equipment is directly incorporated into power grid 3 at this time；With measurement
Device 206 measures the harmonic voltage or harmonic current of a points, you can obtains power electronic equipment and is produced when without any be filtered
Raw harmonic wave；
2) closure switch 10, switch 11 and switch 12, the filtered device 9 of electric energy that power electronic equipment is sent out at this time filter
After be connected to the grid 3；The harmonic voltage or harmonic current that a points are measured using measuring device 206 can obtain power electronic equipment warp
9 filtered harmonic wave of filter；
3) switch 10 and switch 11, closure switch 12 are disconnected, the electric energy that power electronic equipment is sent out at this time passes through MGP systems
2 are connected to the grid 3；The harmonic voltage or harmonic current that b points are measured using measuring device 206 can obtain power electronic equipment warp
2 filtered harmonic wave of MGP systems；
Based on the above measurement data, the subsynchronous and supersynchronous harmonic wave of power electronic equipment generation can be studied；By right
Than MGP system 2 and filter 9 to the filter effect of harmonic wave, the structure of MGP systems 2 is specially designed, and to MGP systems
The control of system 2 is specially modified, and the method that MGP systems 2 inhibit subsynchronous and supersynchronous harmonic wave that promoted can be studied.
Embodiment 3
Attached drawing 4 is the true generation of electricity by new energy device for studying high permeability New-energy power system, as shown in figure 4, the dress
It sets and is made of driving power 1 and MGP systems 2, the device different from the attached research experimental provision of system stability shown in Fig. 2
Driving power 1 be the new energy such as photovoltaic, wind-powered electricity generation real system, the driving power 1 can be wind turbine 103 and transverter
The photovoltaic generating system or battery that 102 wind generator systems constituted or photovoltaic power generation plate 104 and transverter 102 are constituted
105 and transverter 102 constitute energy-storing and power-generating system or other electricity generation systems or system above various combination.The system
It is the true power generator for studying high permeability New-energy power system.Using system shown in Fig. 4, high permeability can be carried out
The series of characteristics of New-energy power system and height power electronics electric system includes mainly：(1) parallel connection of more transverters
Operation；(2) inertial supports and frequency stabilization；(3) low-voltage and high voltage are stablized；(4) small signal stability and damping；(5) temporarily
State angle stability；(6) the grid-connected and off-network characteristic of MGP systems 302；(7) harmonics restraint of new energy electric power electronics.
Embodiment 4
To verify effectiveness of the invention, the present embodiment is using attached shown in fig. 5 without locally load and network simulation mould
Type carries out emulation experiment, simulates new energy using two groups of power electronic equipments in emulation, every group of power electronic equipment is by direct current
Power supply 106 and inverter 107 form.Two groups of power electronic equipment parallel connections import source 201, common to drive MGP systems 2.It is described
MGP systems 2 are incorporated to infinitely great simulated grid 14 by inductance 13, and inductance 13 is used for simulating one section of transmission line of electricity.Due to synchronizing electricity
Motivation 202 can make the voltage UM of source 201 keep stablizing, therefore confluence mode as shown in Figure 5 may be used, and make inversion
Device 107 is according to common control mode and in the source 201 of 202 generator terminal of synchronous motor.Wherein P1 is 106 He of DC power supply
The output power for the new energy simulation system that inverter 107 is constituted, P2 are that another DC power supply 106 and inverter 107 are constituted
New energy simulation system output power, in simulations, the output power of each new energy simulation system is 1.5kW；PG is
MGP systems 2 send out active to infinitely great simulated grid 14；The rated line voltage of infinitely great simulated grid 14 is 380V, synchronous
The rated voltage of 202 machine of motor is 380V, and 2 capacity of MGP systems is 3kW, and the reactance value of inductance 13 is 0.5p.u..It is emulating
In the process, it is 600W that setting inverter 107, which originates output power P1, and it is 500W that another inverter 107, which originates output power P2,；
P1 uprushes as 1200W when emulating 3s, and P2 is plummeted to 200W when 6s.The change of 2 output power of MGP systems is measured with measuring device 206
Change the situation of change with the terminal voltage of synchronous motor 202.
Attached drawing 6 be without the grid-connected simulation result diagram locally loaded, as shown in fig. 6, before 6s, two inverters 107
Stablize transimission power, first inverter 107 sends out power 700W, and second inverter 107 sends out power 500W, MGP system 2
The power sent out is the sum of the power of two inverters 107, is 1200W；When 6s, the power of first inverter 107 is by 700W
1100W is sharp risen to, Spline smoothing has occurred, at this moment, the power that MGP systems 2 are sent out rises rapidly, is vibrated by one
Restoring to stablize after journey, the power that at this moment MGP systems 2 are sent out is 1600W, when this steady operational status continues to 9s, second
The power of a inverter 107 suddenly falls to 200W by 500W, and Spline smoothing has occurred, at this moment, the power that MGP systems 2 are sent out
It is rapid to decline, restore to stablize after an oscillatory process, the power that at this moment MGP systems 2 are sent out is 1300W, hereafter keeps steady
Fixed operation.
The experimental results showed that：The present invention is in stable state, the transmitting active power that can stablize, prominent in the power of source 201
When change, the power of MGP systems 2 can follow the changed power of source 201, and be promptly restored to new steady s tate.This explanation
Two inverters 107 being capable of parallel drive MGP systems 2.
This embodiment is merely preferred embodiments of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
Subject to.
Claims (9)
1. a kind of experimental provision of research high permeability New-energy power system, which is characterized in that including：Driving power (1) and
MGP systems (2)；
The driving power (1) and MGP systems (2) and local load (5) are connected, the MGP systems (2) and power grid (3) and
Load (4) is connected；
The driving power (1) is the true photovoltaic generation of simulation and the simulation system or photovoltaic of wind-power electricity generation characteristic, the new energy of wind-powered electricity generation
The real system in source；
When driving power (1) be simulation system when, by several power electronic equipments in parallel with MGP systems (2) phase
Even, common to drive MGP systems (2), wherein each power electronic equipment is made of power supply and transverter；The power supply is direct current
Power supply or AC power, transverter are inverter or frequency converter；
When driving power (1) is real system, which is the wind generator system that wind turbine and transverter are constituted,
Or the energy-storing and power-generating system that the photovoltaic generating system or battery and transverter of photovoltaic power generation plate and transverter composition are constituted, or on
State the various combination of electricity generation system.
2. a kind of device of research high permeability New-energy power system according to claim 1, which is characterized in that described
MGP systems (2) are by source (201), synchronous motor (202), mechanical connection (203), synchronous generator (204), grid-connected end
(205) it is formed with measuring device (206),
Wherein, one end of synchronous motor (202) is connected with source (201), and the other end passes through mechanical connection (203) and synchronous hair
Motor (204) is connected, and synchronous motor (202) and synchronous generator (204) form synchronous motor pair, pass through grid-connected end (205)
Be connected to the grid (3), and the mechanical connection (203) is used for source (201) and grid-connected end (205) electrical isolation；The measurement dress
It sets (206) with the measurement point a of synchronous motor pair and measurement point b to couple, for measuring voltage, electric current, power, frequency, rotating speed, turning
Square, generator rotor angle and harmonic series system characterisitic parameter.
3. a kind of experimental method of research high permeability New-energy power system, which is characterized in that the experimental method is：
(1) it studies more in the stability of high permeability New-energy power system, including research high permeability New-energy power system
The parallel running of transverter, the inertial supports of system and frequency stabilization, voltage stabilization, small interference stability and damping, transient state generator rotor angle
Stable and MGP system grid connections and off-grid operation characteristic；
(2) harmonic wave for studying high permeability New-energy power system is as follows described：
1) driving power is directly incorporated into power grid, the harmonic voltage or harmonic current of a points is measured using measuring device, is driven
Power supply output harmonic wave content when without any be filtered；
2) it is connected to the grid after filtering the filtered device of electric energy that driving power exports, measuring device is utilized to measure the harmonic wave of a points
Voltage or harmonic current obtain the filtered harmonic content of the filtered device of driving power；
3) by driving power export electric energy be connected to the grid by MGP systems, using measuring device measure b points harmonic voltage or
Harmonic current obtains harmonic content of the driving power after MGP system filters；
4) be based on above-mentioned measurement data, research driving power generate subsynchronous and supersynchronous harmonic wave, by compare step 2) with
Step 3) is to the filter effect of harmonic wave, the method that research promotion MGP systems inhibit subsynchronous and supersynchronous harmonic wave.
4. a kind of experimental method of research high permeability New-energy power system according to claim 3, which is characterized in that
The parallel runnings of more transverters further includes in the research high permeability New-energy power system：It is common after more transverter parallel connections
The assemblage method for importing source, power coordination distribution control when more transverter parallel drive synchronous motors, the more changes of current
Circulation control and parameter coordination in parallel between device are adjusted.
5. a kind of experimental method of research high permeability New-energy power system according to claim 3, which is characterized in that
The inertial supports for studying high permeability New-energy power system and frequency stabilization further include：System experiments with burden and it is
It unites grid-connected experiment, the system experiments with burden is for when studying load sudden change, the variation of the output frequency of synchronous generator to be special
Property and the inertia influence that frequency dynamic is changed that provides of MGP systems；The system grid connection experiment, for studying driving electricity
When source is mutated, the variation characteristic of the output frequency of synchronous generator.
6. a kind of experimental method of research high permeability New-energy power system according to claim 3, which is characterized in that
It is described research high permeability New-energy power system voltage stabilization further include：System grid connection is tested, by being arranged in power grid
The operating mode of low-voltage, high voltage and failure, supporting role of the research synchronous generator to grid-connected terminal voltage.
7. a kind of experimental method of research high permeability New-energy power system according to claim 3, which is characterized in that
The small interference stability of the research high permeability New-energy power system and damping further include：System grid connection is tested and bringing onto load is real
It tests, by the way that load variation, the different types of failure of short circuit, the excitation con-trol of setting and synchronous motor and synchronous generator is arranged
Pattern studies small signal stability.
8. a kind of experimental method of research high permeability New-energy power system according to claim 3, which is characterized in that
It is described research high permeability New-energy power system transient rotor angle stability further include：After breaking down in power grid, synchronize electronic
The ability of the response of transient state generator rotor angle and holding synchronous operation of machine and synchronous generator under the different faults mute time.
9. a kind of experimental method of research high permeability New-energy power system according to claim 3, which is characterized in that
The research high permeability new energy grid-connected and off-grid operation characteristic that passes through MGP systems further includes：Driving power and MGP systems
It is local when stability and driving power band local load operation when driving power and bearing power fluctuate when being incorporated into the power networks
Stability when load power fluctuates.
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