CN105337279B - The analysis method and device of current and voltage harmonic during micro-capacitance sensor access power distribution network - Google Patents
The analysis method and device of current and voltage harmonic during micro-capacitance sensor access power distribution network Download PDFInfo
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Abstract
The invention discloses the analysis method and device of current and voltage harmonic during a kind of micro-capacitance sensor access power distribution network, it is related to electrical network field.Wherein, this method includes：Obtain the harmonic-model of micro-capacitance sensor structure；Obtain the model of the power distribution network of access micro-capacitance sensor；In the case where the model of power distribution network is unit feeder radial networks, after micro-capacitance sensor accesses power distribution network, according to the electrical distance between the access node of micro-capacitance sensor access power distribution network and PCC nodes, to control the size of higher harmonic current caused by micro-capacitance sensor operation；In the case where the model of power distribution network is multinode chain type power distribution network, after micro-capacitance sensor accesses power distribution network, according to on-position during micro-capacitance sensor access power distribution network and the access distance of bus bar side, to determine the voltage harmonic aberration rate occurred after micro-capacitance sensor access power distribution network in circuit.The present invention solves the technical problem that micro-capacitance sensor access can not monitor the harmonic wave in electric energy interaction to power distribution network.
Description
Technical field
The present invention relates to electrical network field, and current and voltage harmonic during power distribution network is accessed in particular to a kind of micro-capacitance sensor
Analysis method and device.
Background technology
Micro-capacitance sensor includes a variety of distributed energies, and distributed power source is mostly, electric power grid-connected by power electronics interface
Harmonic current caused by electronic installation is possible to be injected into power distribution network.In addition, in micro-capacitance sensor typically based on residential electricity consumption, big portion
Electrical installation of breaking up the family carries rectification circuit or phase-control circuit, causes current distortion higher.Micro-capacitance sensor is although take one
A little effective measures, such as by linking output filter, improving switching frequency and improving control strategy to suppress harmonic wave, but not
Produce a small amount of harmonic current injection with can avoiding to power distribution network, form harmonic wave secondary pollution.As micro-capacitance sensor capacity accounts for power distribution network
The ratio of total load gradually increases, and the correct influence for assessing micro-capacitance sensor access to system harmonicses distribution and reasonable disposition are distributed
Power supply, to ensureing that power network and equipment reliably optimize operation, tool is of great significance.
The problem of harmonic wave in electric energy interaction can not be monitored to power distribution network for the access of micro-capacitance sensor in the prior art, mesh
It is preceding not yet to propose effective solution.
The content of the invention
A kind of analysis side of current and voltage harmonic during it is a primary object of the present invention to provide micro-capacitance sensor access power distribution network
Method and device, to solve the problems, such as that micro-capacitance sensor access can not monitor the harmonic wave in electric energy interaction to power distribution network.
To achieve these goals, one side according to embodiments of the present invention, there is provided a kind of micro-capacitance sensor accesses distribution
The analysis method of current and voltage harmonic during net.This method includes：Micro-capacitance sensor models are established, micro-capacitance sensor models include：Obtain micro-
The harmonic-model of electric network composition；The model of the power distribution network of access micro-capacitance sensor is obtained, the model of power distribution network includes：Unit feeder is radial
Network and multinode chain type power distribution network；In the case where the model of power distribution network is unit feeder radial networks, accessed in micro-capacitance sensor
After power distribution network, according to the electrical distance between the access node of micro-capacitance sensor access power distribution network and PCC nodes, to control micro-capacitance sensor
The size of higher harmonic current caused by operation；In the case where the model of power distribution network is multinode chain type power distribution network, in micro- electricity
It is micro- to determine according to on-position during micro-capacitance sensor access power distribution network and the access distance of bus bar side after net access power distribution network
The voltage harmonic aberration rate occurred after power network access power distribution network in circuit.
To achieve these goals, another aspect according to embodiments of the present invention, there is provided during micro-capacitance sensor access power distribution network
Current and voltage harmonic analytical equipment.The device includes：First acquisition module, for obtaining the harmonic wave mould of micro-capacitance sensor structure
Type；Second acquisition module, the model of the power distribution network for obtaining access micro-capacitance sensor, the model of power distribution network include：Unit feeder radiates
Shape network and multinode chain type power distribution network；Control module, in the situation that the model of power distribution network is unit feeder radial networks
Under, micro-capacitance sensor access power distribution network after, according to micro-capacitance sensor access power distribution network access node and PCC nodes between it is electric away from
From to control the size of higher harmonic current caused by micro-capacitance sensor operation；Processing module, for being more piece in the model of power distribution network
In the case of point chain type power distribution network, after micro-capacitance sensor accesses power distribution network, on-position during power distribution network is accessed according to micro-capacitance sensor
With the access distance of bus bar side, come determine micro-capacitance sensor access power distribution network after circuit occur voltage harmonic aberration rate.
According to inventive embodiments, by establishing micro-capacitance sensor models, micro-capacitance sensor models include：Obtain the harmonic wave of micro-capacitance sensor structure
Model；The model of the power distribution network of access micro-capacitance sensor is obtained, the model of power distribution network includes：Unit feeder radial networks and multinode chain
Formula power distribution network；In the case where the model of power distribution network is unit feeder radial networks, after micro-capacitance sensor accesses power distribution network, according to
Electrical distance between the access node and PCC nodes of micro-capacitance sensor access power distribution network, to control high order caused by micro-capacitance sensor operation
The size of harmonic current；Power distribution network model be multinode chain type power distribution network in the case of, micro-capacitance sensor access power distribution network it
Afterwards, according to on-position during micro-capacitance sensor access power distribution network and the access distance of bus bar side, to determine that micro-capacitance sensor accesses power distribution network
The voltage harmonic aberration rate occurred afterwards in circuit, the effect of the harmonic wave in monitoring electric energy interaction is reached, has solved micro-
The problem of micro-capacitance sensor access can not monitor the harmonic wave in electric energy interaction to power distribution network.
Brief description of the drawings
The accompanying drawing for forming the part of the application is used for providing a further understanding of the present invention, schematic reality of the invention
Apply example and its illustrate to be used to explain the present invention, do not form inappropriate limitation of the present invention.In the accompanying drawings：
The stream of the analysis method of current and voltage harmonic when Fig. 1 is micro-capacitance sensor access power distribution network according to embodiments of the present invention
Cheng Tu；
The analysis of current and voltage harmonic when Fig. 2 is a kind of preferably micro-capacitance sensor access power distribution network according to embodiments of the present invention
The flow chart of method；
Fig. 3 is micro-capacitance sensor canonical system schematic diagram according to embodiments of the present invention；
Fig. 4 is micro-capacitance sensor harmonic-model schematic diagram according to embodiments of the present invention；
Fig. 5 is unit feeder electricity distribution network model schematic diagram according to embodiments of the present invention；
Fig. 6 is the chain type distribution net work structure figure according to embodiments of the present invention containing photovoltaic distributed power source；
Fig. 7 is the harmonic current spectrogram of micro-capacitance sensor according to embodiments of the present invention；
The micro-capacitance sensor that Fig. 8 is micro-capacitance sensor access Bus10 according to embodiments of the present invention permeates changed power to harmonic voltage
The influence schematic diagram of aberration rate；
Fig. 9 is that the micro-capacitance sensor on-position that capacity according to embodiments of the present invention is 2.5MW changes to feeder line harmonic voltage
The influence schematic diagram of aberration rate；
Figure 10 is the feeder line harmonic voltage distortion rate curve synoptic diagram of appearance numbering 2 and 4 according to embodiments of the present invention；
The analysis dress of current and voltage harmonic when Figure 11 is a kind of micro-capacitance sensor access power distribution network according to embodiments of the present invention
The schematic diagram put；
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
In order that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, it should all belong to the model that the present invention protects
Enclose.
It should be noted that term " first " in description and claims of this specification and above-mentioned accompanying drawing, "
Two " etc. be for distinguishing similar object, without for describing specific order or precedence.It should be appreciated that so use
Data can exchange in the appropriate case, so as to embodiments of the invention described herein.In addition, term " comprising " and " tool
Have " and their any deformation, it is intended that cover it is non-exclusive include, for example, containing series of steps or unit
Process, method, system, product or equipment are not necessarily limited to those steps clearly listed or unit, but may include without clear
It is listing to Chu or for the intrinsic other steps of these processes, method, product or equipment or unit.
The embodiments of the invention provide the analysis method of current and voltage harmonic during a kind of micro-capacitance sensor access power distribution network.
The stream of the analysis method of current and voltage harmonic when Fig. 1 is micro-capacitance sensor access power distribution network according to embodiments of the present invention
Cheng Tu.As shown in figure 1, analysis side's method of current and voltage harmonic during micro-capacitance sensor access power distribution network is as follows including step：
Step S102, obtain the harmonic-model of micro-capacitance sensor structure；
Step S104, obtains the model of the power distribution network of access micro-capacitance sensor, and the model of power distribution network includes：The radial net of unit feeder
Network and multinode chain type power distribution network；
Step S106, in the case where the model of power distribution network is unit feeder radial networks, power distribution network is accessed in micro-capacitance sensor
Afterwards, the electrical distance accessed according to micro-capacitance sensor between the access node of power distribution network and PCC nodes, to control micro-capacitance sensor operation production
The size of raw higher harmonic current；
Step S108, in the case where the model of power distribution network is multinode chain type power distribution network, power distribution network is accessed in micro-capacitance sensor
Afterwards, according to on-position during micro-capacitance sensor access power distribution network and the access distance of bus bar side, to determine that micro-capacitance sensor accesses distribution
The voltage harmonic aberration rate occurred after net in circuit.
In above-described embodiment, the model of micro-capacitance sensor typical structure model and power distribution network is established based on matlab, passes through theory
Analysis and simulation calculation, are analyzed the harmonic current distribution character of the power distribution network containing micro-capacitance sensor.
Influence problem for micro-capacitance sensor access to Distribution Network Harmonics distribution, when load variations, each harmonic distribution feelings
The change of condition.Micro-capacitance sensor typical structure harmonic-model and distribution are established according to power distribution network CURRENT DISTRIBUTION and the aspect of voltage's distribiuting two
The model of net, for analyzing distribution situation of the harmonic current in power network.In terms of voltage's distribiuting, power distribution network is oozed from micro-capacitance sensor
The influence that saturating changed power and on-position are distributed to harmonic wave, is carried out to the harmonic voltage distribution character of the power distribution network containing micro-capacitance sensor
Detailed analysis, find in the case where not changing micro-capacitance sensor infiltration power harmonic source model, micro-capacitance sensor introduce position with it is total
Percent harmonic distortion relation is larger.
The analysis side of current and voltage harmonic when Fig. 2 is a kind of preferably micro-capacitance sensor access power distribution network according to above-described embodiment
The flow chart of method.According to the analysis method of current and voltage harmonic during above-described embodiment micro-capacitance sensor access power distribution network, wherein step
It is used to also include the step of obtaining the harmonic-model of micro-capacitance sensor structure in S102：
Step S1021, at least one load and distributed power source are packaged, form the system model of micro-capacitance sensor, point
Cloth power supply includes following any one or more power-supply devices：Miniature gas turbine, wind-driven generator, solar generator,
Wherein, the distributed power source in micro-capacitance sensor accesses power distribution network, distributed Voltage generation harmonic wave, micro-capacitance sensor by power electronic equipment
In load include rectification circuit or phase-control circuit, generate current distortion；
Step S1023, the source lotus characteristic of the system model based on micro-capacitance sensor establish the harmonic-model of micro-capacitance sensor structure, its
In, the harmonic-model of micro-capacitance sensor structure includes：Power distribution network, the access point and distribution of micro-capacitance sensor access power distribution network of micro-capacitance sensor access
Net is included in the impedance Z L of the access point load between the impedance Z eq between the points of common connection of bulk power grid, micro-capacitance sensor and power distribution network
With the internal driving ZMG of micro-capacitance sensor.
Specifically, micro-capacitance sensor shows as a single controllable unit to power distribution network by together with load and power package,
With source lotus characteristic.Most distributed power source accesses power network by power electronic equipment in micro-capacitance sensor, can produce during its work
Raw substantial amounts of harmonic wave；In addition, most of household electric appliances carry rectification circuit or phase-control circuit in micro-capacitance sensor, cause electricity
Stream distortion is higher.Therefore, the access of micro-capacitance sensor turns into the potential harmonic source of power distribution network；On the other hand, the harmonic wave electricity in micro-capacitance sensor
After stream injection power network, harmonic voltage can be produced, the operation on micro-capacitance sensor also produces certain influence.In order to more accurately explain micro- electricity
Harmonic characterisitic after net access power network, the harmonic-model of micro-capacitance sensor in power distribution network will be established below.
For a typical micro-grid system containing miniature gas turbine, wind-power electricity generation, photovoltaic generation, energy storage and load such as
Fig. 3, consider that its internal regenerative resource such as wind-power electricity generation and photovoltaic generation is influenceed by natural conditions, power output is at random and not
Continuously, therefore it is believed that it is power supply or part throttle characteristics that micro-capacitance sensor runs period general performance at some.Above-described embodiment is intended being based on
The source lotus characteristic of micro-capacitance sensor establishes the harmonic-model of typical micro-grid system.
For example, studied with the most wide 380V three-phase low-voltage power distribution networks of current application surface, the model established such as Fig. 4 institutes
Show.Wherein, Zeq represents the impedance between the points of common connection of micro-capacitance sensor access point and power distribution network access bulk power grid；ZL is access
The equiva lent impedance of point load；ZMG represents the internal driving of micro-capacitance sensor.
The spectral range of generation harmonic wave is very big when micro-capacitance sensor is run, and wherein low order (low frequency) harmonic wave can be by adopting inside microgrid
Some effective measures are taken, such as by linking output filter, improving switching frequency and improving control strategy to suppress, and due to
Power distribution network low-frequency impedance is smaller, and in most cases its influence to Distribution Network Harmonics characteristic is also smaller.It is therefore, main herein
Pay close attention to influence of the higher hamonic wave to Distribution Network Harmonics characteristic caused by micro-capacitance sensor operation.
Preferably, it is used to also include obtaining access micro-capacitance sensor according to any one above-mentioned embodiment, in wherein step S104
Power distribution network model the step of also include：
Step S1041, at least one load bus, power supply source and load are attached by network line, composition connects
Entering the model of the power distribution network of micro-capacitance sensor, the model of power distribution network is unit feeder radial networks, wherein, any one or more loads
Access node of the node as power distribution network access micro-capacitance sensor, the model for accessing the power distribution network of micro-capacitance sensor use constant-impedance pattern.
According to the analysis method of current and voltage harmonic during a kind of preferably micro-capacitance sensor access power distribution network of above-described embodiment
Flow chart.According to the analysis method of current and voltage harmonic during above-described embodiment micro-capacitance sensor access power distribution network, wherein step S106
In be used for according to micro-capacitance sensor access power distribution network access node and PCC nodes between electrical distance, to control micro-capacitance sensor to run
The step of size of caused higher harmonic current, also includes：
Electrical distances of the step S1061 between the access node of micro-capacitance sensor access power distribution network and PCC nodes exceedes predetermined
In the case of value, the impedance between the access node and PCC nodes of circuit micro-capacitance sensor access power distribution network suppresses higher harmonic current,
So that higher harmonic current is less than predetermined harmonic current.
Specifically, the implication that the legend symbol in Fig. 5 represents is as follows：Horizontal line " --- " represents LV network lines, arrow
" → ", represents user load, and asterisk " " represents overhead line pole, hollow rectangular rectangleRepresent tie point
As shown in figure 5, so that voltage class is 0.4kV unit feeder radial networks as an example, wherein, N3l, N44, N61,
This 5 nodes of N91, N101 are load bus, and the access point of micro-capacitance sensor is typically selected in load bus.From the angle of research harmonic characterisitic
Degree, constant-impedance pattern is use only herein, i.e. power distribution network institute bringing onto load is RL loads.
In order to study influence of the higher hamonic wave to Distribution Network Harmonics characteristic in micro-capacitance sensor, using simulation model, by identical
Micro-capacitance sensor is respectively connected to 5 load buses in power distribution network, calculates micro-capacitance sensor access point switching frequency sideband harmonic current and electricity
The size of pressure, as a result as shown in table 1.Wherein fs-1 and fs+1 represents the harmonics of micro-capacitance sensor switching frequency sideband, Ih and
Uh represents harmonic current and voltage respectively.
Table 1：
Shown in table 1, when being that micro-capacitance sensor is respectively connected to difference in power distribution network, shown in access point harmonic current and voltmeter 1,
When being that micro-capacitance sensor is respectively connected to difference in power distribution network, access point harmonic current and voltage effective value.Can to analysis of simulation result
Know, due to the equiva lent impedance ZL of access point load>>Zeq (under harmonic frequency), a large amount of power electronic equipments work in micro-capacitance sensor inside
Caused high-frequency harmonic electric current, major part all flows to PCC points by distribution network line and enters power network, and harmonic wave is produced on Zeq
Pressure drop.Therefore, as micro-capacitance sensor access point all increases away from PCC points, the equivalent Zeq of access point and harmonic voltage therewith.
Table 2：
| N2 | N3 | N31 | N4 | N5 | N6 | N7 | N8 | N9 | N10 | N101 | |
| Fs-1 times | 0.79 | 1.5 | 1.98 | 1.49 | 1.49 | 1.49 | 1.49 | 1.49 | 1.49 | 1.49 | 1.48 |
| Fs+1 times | 0.79 | 1.52 | 2.01 | 1.51 | 1.51 | 1.51 | 1.51 | 1.51 | 1.51 | 1.51 | 1.5 |
| Fundamental voltage | 935.1 | 393.1 | 398.6 | 390.1 | 388.7 | 387.2 | 386.4 | 385.6 | 384.8 | 384.1 | 381.7 |
| THD/% | 0.59 | 0.9 | 1.16 | 0.94 | 0.95 | 0.97 | 1 | 1.03 | 1.07 | 1.09 | 1.1 |
Table 3：
| N2 | N3 | N31 | N4 | N5 | N6 | N7 | N8 | N9 | N10 | N101 | |
| Fs-1 times | 0.97 | 1.41 | 1.41 | 1.86 | 2.31 | 2.76 | 3.22 | 3.68 | 4.13 | 4.58 | 4.97 |
| Fs+1 times | 1.05 | 1.53 | 1.53 | 2.01 | 2.5 | 2.98 | 3.47 | 3.97 | 4.45 | 4.95 | 5.37 |
| Fundamental voltage | 395.7 | 393.1 | 391.6 | 390.8 | 389.9 | 389.1 | 388.9 | 388.7 | 388.5 | 388.5 | 388.7 |
| THD/% | 0.69 | 1.13 | 1.15 | 1.54 | 1.8 | 2.11 | 2.44 | 2.77 | 3.01 | 3.38 | 3.59 |
Shown in table 2 and table 3, when being that micro-capacitance sensor is respectively connected to N31 and N101 points, there is the harmonic voltage of each node in power distribution network
Valid value and the aberration rate of voltage (THDV).From simulation result it is seen that, using micro-capacitance sensor access point as boundary, closer to PCC section
Point, smaller, and the node that electrical distance is farther compared with micro-capacitance sensor access point, the characteristic of its harmonic voltage are influenceed by micro-capacitance sensor harmonic wave
It is then essentially identical with micro-capacitance sensor access point.
By the modeling to micro-capacitance sensor typical structure and power distribution network and the simulation calculation of harmonic characterisitic, micro-capacitance sensor has been grasped
Access the influence to Distribution Network Harmonics characteristic.First, after micro-capacitance sensor access power distribution network, higher harmonic current is by micro-capacitance sensor access point
The influence of impedance is very big between PCC points, and electrical distance is more remote, and line impedance is bigger, to the inhibitory action of higher harmonic current
Stronger, higher harmonic current is smaller.Secondly as the higher hamonic wave impedance between access point and PCC points, much smaller than loading and match somebody with somebody
The equiva lent impedance of electrical distance more distal part in power network, higher harmonic current caused by micro-capacitance sensor access is most of all to be flowed to
PCC nodes.Finally, due to above-mentioned reason, in the case where multiple micro-capacitance sensors access power distribution network, merely with percent harmonic distortion, has
When be difficult to the harmonic characterisitic of accurate evaluation power network.
Preferably, the preferable embodiment party of the analysis method of current and voltage harmonic during a kind of micro-capacitance sensor access power distribution network
It is used to also include the step of obtaining the model of the power distribution network of access micro-capacitance sensor in formula, wherein step S104：
Step S1043, distributed power source, load bus and load are attached by the bus of equivalent power network, formed
The model of the power distribution network of micro-capacitance sensor is accessed, the model of power distribution network is multinode chain type power distribution network, wherein, along feeder line from equivalent power network
Bus start to be numbered to form power distribution network by each concentrated load node successively.
Preferably, access digit during power distribution network is accessed according to micro-capacitance sensor according to above-mentioned embodiment, in wherein step S108
The access distance with bus bar side is put, to determine the step of the voltage harmonic aberration rate occurred after micro-capacitance sensor access power distribution network in circuit
Suddenly also include：
Step S1081, in exchanging in the case that power harmonic source model keeps certain for micro-capacitance sensor and power distribution network, obtain
The access node of multiple on-positions of micro-capacitance sensor access power distribution network；
Step S1083, obtain the harmonic voltage distortion rate THDV curves of the access node of each on-position；
Step S1085, the harmonic voltage distortion rate THDV curves of the access node based on each on-position are every to obtain
The voltage harmonic aberration rate of the access node of individual on-position,
Wherein, when single micro-capacitance sensor, if the on-position of micro-capacitance sensor is less than position threshold apart from the position of bus bar side,
THDV then before micro-capacitance sensor access node is bigger, and the THDV after micro-capacitance sensor access node is smaller, micro-capacitance sensor access distribution
Voltage harmonic aberration rate after net on the line is less than predetermined value.
Specifically, the present embodiment carries out frequency analysis using multinode chain type power distribution network example, its load model uses
Invariable power static load model.Each concentrated load is considered as a node along feeder line and numbered, from equivalent power network
Bus0 buses start to compile successively as Busl, Bus2 ... BusN (N=20), form power distribution network as shown in Figure 6.
Equivalent power network busbar voltage is taken as UBus=1.02, and all loads are relative to SBus with micro-capacitance sensor infiltration power
The per unit value of=10MVA benchmark, voltage base value VBus=380V.It is system balancing node to make Bus0 buses, voltage UBus0=
1.02∠0°.Assuming that each section of circuit of system is not grown, its shunt capacitance is relatively small, can ignore, and only considers the string of circuit
Join resistance and reactance.The total active power load of system is 0.4963pu, load or burden without work 0.5067Pu.Wherein, end BusN
Nonlinear-load is connected at bus, its harmonic wave type is 6 pulse current source models；Remaining is linear load.Each section of transmission line of electricity
Impedance and each node load, are shown in Table 4.
Table 4：
| Node | Resistance | Reactance | Active power | Reactive power |
| 1 | 0.0002 | 0.0005 | 0.0497 | 0.0261 |
| 2 | 0.0082 | 0.0246 | 0.0034 | 0.0065 |
| 3 | 0.0005 | 0.0017 | 0.0487 | 0.0002 |
| 4 | 0.0009 | 0.0027 | 0.0461 | 0.0163 |
| 5 | 0.007 | 0.0209 | 0.0479 | 0.018 |
| 6 | 0.0015 | 0.0044 | 0.0282 | 0.0497 |
| 7 | 0.0006 | 0.0017 | 0.0475 | 0.047 |
| 8 | 0.0006 | 0.0019 | 0.0159 | 0.0217 |
| 9 | 0.0072 | 0.0217 | 0.0133 | 0.0468 |
| 10 | 0.0003 | 0.001 | 0.0031 | 0.0248 |
| 11 | 0.007 | 0.0209 | 0.0166 | 0.0486 |
| 12 | 0.0022 | 0.0066 | 0.0146 | 0.0479 |
| 13 | 0.0063 | 0.0188 | 0.0201 | 0.036 |
| 14 | 0.0051 | 0.0154 | 0.0017 | 0.0324 |
| 15 | 0.0058 | 0.0173 | 0.0144 | 0.0431 |
| 16 | 0.0029 | 0.0086 | 0.011 | 0.0015 |
| 17 | 0.0089 | 0.0268 | 0.0283 | 0.0183 |
| 18 | 0.0009 | 0.0028 | 0.0435 | 0.0047 |
| 19 | 0.0029 | 0.0088 | 0.0127 | 0.0167 |
| 20 | 0.0082 | 0.0247 | 0.0296 | 0.0004 |
For above-mentioned chain type distribution network system, micro-capacitance sensor is measured from micro-capacitance sensor outflow using typical structure access power network
Current waveform.Equally spaced sample within each cycle of micro-capacitance sensor current waveform at 128 points, and using MATLAB softwares to adopting
Sample value carries out Fourier analysis, and the frequency spectrum for obtaining harmonic current is as shown in Figure 7.
Distributed power source in micro-capacitance sensor is generated electricity using renewable resources such as substantial amounts of wind energy, solar energy, the output of energy
Influenceed by extraneous factors such as geographic basis, weather and weathers, cause the Power Exchange characteristic of micro-capacitance sensor and power distribution network complicated, certainly will
The quality of voltage of power distribution network is impacted.This section uses same network and load data, and analysis micro-capacitance sensor infiltration power becomes
Change the influence to Distribution Network Harmonics distribution.On-position (Bus10) the harmonic source model of micro-capacitance sensor keeps certain, and it is right to change its
The infiltration power of power distribution network, during change such as table 5, system loading growth pattern are full load equal proportion increase inside power distribution network, and
Keep power factor constant, the output scheduling mode of whole load growths is undertaken using grid side power supply.Simulation analysis system is humorous
Wave voltage aberration rate THDV situation of change.
Table 5：
As seen from Figure 8, as micro-capacitance sensor permeates the gradual increase of power, each node voltage along feeder line to power distribution network
Percent harmonic distortion gradually rises.When micro-capacitance sensor infiltration power reaches certain value, such as situation of numbering 4 and numbering 5, node along the line
THDV maximum will be not present in the feeder terminal of nonlinear-load access, but in the access node of micro-capacitance sensor.Infiltration
For the micro-capacitance sensor that power is 20MW compared with the micro-capacitance sensor that infiltration power is 0.1MW, feeder terminal node THDV adds 3 times, micro-
Power network access node Bus10 THDV adds 11 times.Moreover, (Bus9 of the feeder line of numbering 4 is arrived some serious nodes of distortion
Bus20 nodes, Bus7 to the Bus20 nodes of the feeder line of numbering 5) THDV have been over the limit value 5% of harmonic voltage distortion rate,
Highest aberration rate reaches 7.37%, occurs at the Bus10 nodes of the feeder line of numbering 5.
As a result show, in the case where not changing micro-capacitance sensor on-position harmonic source model, THDV is by micro- electricity on feeder line
The infiltration power decision of net, it permeates, and power is bigger, and it is higher to account for the ratio of total load, each node voltage harmonic distortion along feeder line
The bigger of rate is in this case, it is necessary to which reasonable control micro-capacitance sensor exchanges power with distribution.
Using same network and load data, shadow of the analysis micro-capacitance sensor on-position change to Distribution Network Harmonics distribution
Ring.Micro-capacitance sensor keeps certain with the power harmonic source model that exchanges of power distribution network, and is run with lagging power-factor 0.9, and it connects
When entering the position such as change of table 6, simulation analysis system harmonic voltage distortion rate THDV situation of change.
Table 6：
| Numbering | 1 | 2 | 3 | 4 | 5 |
| Microgrid on-position | Bus2 | Bus8 | Bus14 | Bus19 | Bus20 |
The capacity for taking micro-capacitance sensor is 2.5MW, with various position access power networks in table 6, it is emulated respectively, gained feeder line is each
The harmonic voltage distortion rate THDV curves of node are as shown in Figure 9.
As shown in figure 9, the crosspoint between each curve is more, with the change of micro-capacitance sensor access node, feeder line respectively saves
Point THDV situation of change is not consistent.Therefore, for the ease of analysis, feeder line in the case of 4 two kinds of numbering 2 and numbering is individually listed
The harmonic voltage distortion rate curve of node, as shown in Figure 10.
As seen from Figure 10, when micro-capacitance sensor on-position is Bus8, Bus8 and its front nodal point harmonic voltage distortion
Rate is big when than on-position being Bus19, and THDV is up to 0.3%；The harmonic voltage distortion rate of Bus8 posterior nodal point is than micro- electricity
Net on-position is small when being Bus19, and THDV is up to 4.4%.It is with on-position when micro-capacitance sensor on-position is Bus14
Compared during Bus19, Busl4 and its front nodal point harmonic voltage distortion rate it is big, the harmonic voltage distortion of Bus14 posterior nodal point
Rate is small.So when single micro-capacitance sensor, THDV of its on-position before system busbar, micro-capacitance sensor access node
It is bigger, and the THDV after micro-capacitance sensor access node is smaller, but the degree of two kinds of changes is different, is generally also reduction of line
The harmonic distortion on road is horizontal.When multiple micro-capacitance sensors are in dispersed distribution on feeder line, its closer feeder line of THDV curve ratio micro-capacitance sensors
THDV curves during head end position are high, and THDV curves during feeder terminal position more closer than micro-capacitance sensor are low.It is with on-position
Node Bus2 is compared, and feeder terminal node voltage percent harmonic distortion adds 4.81% when micro-capacitance sensor on-position is Bus19, section
Point Bus19 voltage harmonic aberration rates increase 5%, and node Bus2 voltage harmonic aberration rates reduce 0.2%.Moreover, work as micro- electricity
During net access node Bus19, the THDV of Bus15 to Bus20 nodes has been above the limit value 5% of harmonic voltage distortion rate, highest
Aberration rate reaches 6.76%.
As a result show, the on-position of micro-capacitance sensor is closer to the THDV before bus bar side, micro-capacitance sensor access node
It is bigger, and the THDV after micro-capacitance sensor access node is smaller, but both degree of change are different, and the harmonic wave of generally circuit is abnormal
Become horizontal lower.Conversely, distance line end is more remote, harmonic effects are bigger to caused by system.
By simulation calculation, exchange with power distribution network changed power to micro-capacitance sensor and micro-capacitance sensor on-position is distributed to harmonic wave
Influence has carried out detailed analysis.
In the case where not changing micro-capacitance sensor on-position harmonic source model, on feeder line THDV by micro-capacitance sensor to power distribution network
Infiltration power decision, it permeates, and power is bigger, and it is higher to account for the ratio of total load, each node voltage percent harmonic distortion along feeder line
It is bigger.
In the case where not changing infiltration power harmonic source model of the micro-capacitance sensor to power distribution network, the on-position of micro-capacitance sensor
Closer to lower closer to bus bar side, the harmonic distortion level of generally circuit.Conversely, distance line end is more remote, to system
Caused by harmonic effects it is bigger.
The analytical equipment of current and voltage harmonic when the embodiment of the present invention additionally provides a kind of micro-capacitance sensor access power distribution network.Should
The analysis method of current and voltage harmonic when device can access power distribution network by micro-capacitance sensor realizes its function.Need what is illustrated
It is that the analytical equipment of the current and voltage harmonic when micro-capacitance sensor of the embodiment of the present invention accesses power distribution network can be used for performing the present invention
The analysis method of current and voltage harmonic during the micro-capacitance sensor access power distribution network that embodiment is provided, the micro-capacitance sensor of the embodiment of the present invention
The analysis method of current and voltage harmonic when accessing power distribution network can also be accessed by the micro-capacitance sensor that the embodiment of the present invention is provided
The analytical equipment of current and voltage harmonic during power distribution network performs.
The analytical equipment of current and voltage harmonic when Figure 11 is micro-capacitance sensor access power distribution network according to embodiments of the present invention
Schematic diagram.As shown in figure 11, the analytical equipment of current and voltage harmonic during a kind of preferably micro-capacitance sensor access power distribution network includes：
First acquisition module 110, for obtaining the harmonic-model of micro-capacitance sensor structure；
Second acquisition module 112, the model of the power distribution network for obtaining access micro-capacitance sensor, the model of power distribution network include：It is single
Feeder line radial networks and multinode chain type power distribution network；
Control module 114, in the case of being unit feeder radial networks in the model of power distribution network, accessed in micro-capacitance sensor
After power distribution network, according to the electrical distance between the access node of micro-capacitance sensor access power distribution network and PCC nodes, to control micro-capacitance sensor
The size of higher harmonic current caused by operation；
Processing module 116, in the case of being multinode chain type power distribution network in the model of power distribution network, accessed in micro-capacitance sensor
After power distribution network, according to on-position during micro-capacitance sensor access power distribution network and the access distance of bus bar side, to determine that micro-capacitance sensor connects
Enter the voltage harmonic aberration rate occurred after power distribution network in circuit.
First acquisition module 110 of the device can include：
Package module 1101, at least one load and distributed power source to be packaged, the system for forming micro-capacitance sensor
Model, distributed power source include following any one or more power-supply devices：Miniature gas turbine, wind-driven generator, solar energy
Generator, wherein, the distributed power source in micro-capacitance sensor accesses power distribution network by power electronic equipment, and distributed Voltage generation is humorous
Ripple, the load in micro-capacitance sensor include rectification circuit or phase-control circuit, generate current distortion；
Module 1103 is established, the source lotus characteristic for the system model based on micro-capacitance sensor establishes the harmonic wave mould of micro-capacitance sensor structure
Type, wherein, the harmonic-model of micro-capacitance sensor structure includes：Power distribution network, the access point of micro-capacitance sensor access power distribution network of micro-capacitance sensor access
The access point load being included in power distribution network between the impedance Z eq between the points of common connection of bulk power grid, micro-capacitance sensor and power distribution network
Impedance Z L and micro-capacitance sensor internal driving ZMG.
Preferably, the second acquisition module 112 of the device can include：
First link block 1121, for being carried out at least one load bus, power supply source and load by network line
Connection, the model of the power distribution network of access micro-capacitance sensor being formed, the model of power distribution network is unit feeder radial networks, wherein, it is any one
Access node of individual or multiple load buses as power distribution network access micro-capacitance sensor, the model of power distribution network of micro-capacitance sensor is accessed using permanent
Impedance mode.
Preferably, the control module 114 of the device can include：
Suppression module 1141, for the electrical distance between the access node of micro-capacitance sensor access power distribution network and PCC nodes
In the case of predetermined value, the impedance between the access node and PCC nodes of circuit micro-capacitance sensor access power distribution network suppresses high order
Harmonic current so that higher harmonic current is less than predetermined harmonic current.
With reference to above-described embodiment, the second acquisition module 112 of the device can also include：
Second link block 1123, for the bus by equivalent power network by distributed power source, load bus and load into
Row connection, the model of the power distribution network of access micro-capacitance sensor being formed, the model of power distribution network is multinode chain type power distribution network, wherein, along feedback
Each concentrated load node is numbered to form power distribution network by line successively since the bus of equivalent power network.
Preferably, according to above-described embodiment, the device processing module, which includes 116, also to be included：
First sub-acquisition module 1161, for keeping certain with the power harmonic source model that exchanges of power distribution network in micro-capacitance sensor
In the case of, obtain the access node that micro-capacitance sensor accesses multiple on-positions of power distribution network；
Second sub-acquisition module 1163, the harmonic voltage distortion rate THDV of the access node for obtaining each on-position
Curve；
3rd sub-acquisition module 1165, the harmonic voltage distortion rate THDV for the access node based on each on-position
Curve, to obtain the voltage harmonic aberration rate of the access node of each on-position,
Wherein, when single micro-capacitance sensor, if the on-position of micro-capacitance sensor is less than position threshold apart from the position of bus bar side,
THDV then before micro-capacitance sensor access node is bigger, and the THDV after micro-capacitance sensor access node is smaller, micro-capacitance sensor access distribution
Voltage harmonic aberration rate after net on the line is less than predetermined value.
Now using micro-capacitance sensor operation conditions as example, sampling analysis is carried out to micro-grid connection point voltage x current, and analyze energy storage
In the case of deficiency, each primary current harmonic content when microgrid exchanges power.
1. micro-grid connection point voltage x current is tested：
To under different conditions, the voltage of energy storage grid entry point and the electric current flowed through are tested for this part, during grid-connected charging, storage
Grid entry point voltage and electric current can be flowed through；Grid-connected charging simultaneously grid entry point voltage and flows through electric current during load resistive with 10kW.It can see
Go out, under above two different conditions, voltage waveform is good；Charging current waveform is preferable；When throwing load, energy storage is switched to by charging
Electric discharge, discharge current is smaller, and output current harmonics content is higher.
2. microgrid output current harmonics content
Output current harmonics content is larger under microgrid overload situations it can be seen from above-mentioned current waveform, specific humorous with regard to it
Ripple distribution situation is analyzed and researched.
Below under 0kW, 10kW and 30kW resistive load condition, to test respectively energy storage side output current,
Observation measures current harmonic content (being represented with the percentage of fundamental voltage amplitude) change.When load variations, energy storage is by charged state
Switch to discharge condition, when discharge current is larger, current waveform shows preferable sine degree, and harmonic content is relatively low.It is right respectively
Above-mentioned electric current carries out harmonic content analysis, and in low current charge, energy storage charging current waveform is poor, 3 times and 7 subharmonic contents
It is larger；After 10kW loads are put into, energy storage has charging to switch to discharge, and in low discharging current, energy storage charging current waveform is poor, and 3
It is secondary, 5 times it is larger with 7 subharmonic contents；After load further increases, energy storage electric discharge harmonic current improves, 3 times, 7 subharmonic electricity
Based on stream；During load is continuously increased, energy storage discharges harmonic current closer to declared working condition, individual harmonic current content
Reduce.
Test is carried out in the case where energy storage inverter supports, and there is no the evaluation criterion on energy storage inverter at present,
With reference to national standard《GB/T 14549-1993 quality of power supply utility network harmonic waves》, inverter maximum output capacity 110kVA, can see
Go out, in the case of above-mentioned different loads, harmonic content meets inverter output harmonic wave requirement, but energy storage is operated in specified work
The content of harmonic current can be reduced under condition.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (12)
- A kind of 1. analysis method of current and voltage harmonic during micro-capacitance sensor access power distribution network, it is characterised in that including：Obtain the harmonic-model of micro-capacitance sensor structure；The model for the power distribution network for accessing the micro-capacitance sensor is obtained, the model of the power distribution network includes：Unit feeder radial networks and Multinode chain type power distribution network；In the case where the model of the power distribution network is the unit feeder radial networks, the distribution is accessed in the micro-capacitance sensor After net, according to the electrical distance between the access node of the micro-capacitance sensor access power distribution network and PCC nodes, to control State the size of higher harmonic current caused by micro-capacitance sensor operation；In the case where the model of the power distribution network is the multinode chain type power distribution network, the distribution is accessed in the micro-capacitance sensor After net, according to the on-position during micro-capacitance sensor access power distribution network and the access distance of bus bar side, described in determining Micro-capacitance sensor accesses after the power distribution network voltage harmonic aberration rate occurred in circuit.
- 2. according to the method for claim 1, it is characterised in that obtain micro-capacitance sensor structure harmonic-model the step of include：At least one load and distributed power source are packaged, form the system model of the micro-capacitance sensor, the distributed electrical Source includes following any one or more power-supply devices：Miniature gas turbine, wind-driven generator, solar generator, wherein, institute The distributed power source stated in micro-capacitance sensor accesses the power distribution network by power electronic equipment, and distributed Voltage generation harmonic wave is described The load in micro-capacitance sensor includes rectification circuit or phase-control circuit, generates current distortion；The source lotus characteristic of system model based on the micro-capacitance sensor establishes the harmonic-model of the micro-capacitance sensor structure, wherein, it is described The harmonic-model of micro-capacitance sensor structure includes：Power distribution network, the micro-capacitance sensor of the micro-capacitance sensor access access connecing for the power distribution network Access point and the power distribution network be included in impedance Z eq between the points of common connection of bulk power grid, the micro-capacitance sensor and the power distribution network it Between access point load impedance Z L and the micro-capacitance sensor internal driving ZMG.
- 3. method according to claim 1 or 2, it is characterised in that obtain the model for the power distribution network for accessing the micro-capacitance sensor The step of include：At least one load bus, power supply source and load are attached by network line, form access micro- electricity The model of the power distribution network of net, the model of the power distribution network is the unit feeder radial networks, wherein, it is any one or more negative Lotus node accesses the access node of the micro-capacitance sensor, the model of the power distribution network of the access micro-capacitance sensor as the power distribution network Using constant-impedance pattern.
- 4. according to the method for claim 3, it is characterised in that the access section of the power distribution network is accessed according to the micro-capacitance sensor Electrical distance between point and PCC nodes, come control the micro-capacitance sensor run caused by higher harmonic current size the step of Including：Exceed in the electrical distance that the micro-capacitance sensor is accessed between the access node of the power distribution network and the PCC nodes pre- In the case of definite value, the resistance between the access node of the circuit micro-capacitance sensor access power distribution network and the PCC nodes It is anti-to suppress the higher harmonic current so that the higher harmonic current is less than predetermined harmonic current.
- 5. method according to claim 1 or 2, it is characterised in that obtain the model for the power distribution network for accessing the micro-capacitance sensor The step of include：Distributed power source, load bus and load are attached by the bus of equivalent power network, it is described micro- to form the access The model of the power distribution network of power network, the model of the power distribution network is the multinode chain type power distribution network, wherein, along feeder line from described etc. The bus of effect power network starts to be numbered to form the power distribution network by each concentrated load node successively.
- 6. according to the method for claim 5, it is characterised in that after the micro-capacitance sensor accesses the power distribution network, according to The access distance of on-position and bus bar side during the micro-capacitance sensor access power distribution network, to determine the micro-capacitance sensor access institute State power distribution network includes in the step of voltage harmonic aberration rate that circuit occurs afterwards：In exchanging in the case that power harmonic source model keeps certain for the micro-capacitance sensor and the power distribution network, obtain described micro- Power network accesses the access node of multiple on-positions of the power distribution network；Obtain the harmonic voltage distortion rate THDV curves of the access node of each on-position；The harmonic voltage distortion rate THDV curves of access node based on each on-position, to obtain each on-position Access node voltage harmonic aberration rate,Wherein, when single micro-capacitance sensor, if the on-position of the micro-capacitance sensor is less than position apart from the position of the bus bar side Threshold value, then the THDV before the micro-capacitance sensor accesses the node is bigger, and the THDV after micro-capacitance sensor access node is smaller, institute State the voltage harmonic aberration rate that micro-capacitance sensor is accessed after the power distribution network on the line and be less than predetermined value.
- A kind of 7. analytical equipment of current and voltage harmonic during micro-capacitance sensor access power distribution network, it is characterised in that including：First acquisition module, for obtaining the harmonic-model of micro-capacitance sensor structure；Second acquisition module, for obtaining the model for the power distribution network for accessing the micro-capacitance sensor, the model of the power distribution network includes：It is single Feeder line radial networks and multinode chain type power distribution network；Control module, in the case of being the unit feeder radial networks in the model of the power distribution network, in micro- electricity Net is accessed after the power distribution network, the electricity accessed according to the micro-capacitance sensor between the access node of the power distribution network and PCC nodes Gas distance, to control the size of higher harmonic current caused by the micro-capacitance sensor operation；Processing module, in the case of being the multinode chain type power distribution network in the model of the power distribution network, in micro- electricity Net is accessed after the power distribution network, the access of on-position and bus bar side when accessing the power distribution network according to the micro-capacitance sensor away from From to determine that the micro-capacitance sensor accesses after the power distribution network voltage harmonic aberration rate occurred in circuit.
- 8. device according to claim 7, it is characterised in that first acquisition module includes：Package module, at least one load and distributed power source to be packaged, the system model of the micro-capacitance sensor is formed, The distributed power source includes following any one or more power-supply devices：Miniature gas turbine, wind-driven generator, solar energy hair Motor, wherein, the distributed power source in the micro-capacitance sensor accesses the power distribution network, distributed Voltage life by power electronic equipment Into harmonic wave, the load in the micro-capacitance sensor includes rectification circuit or phase-control circuit, generates current distortion；Module is established, the source lotus characteristic for the system model based on the micro-capacitance sensor establishes the harmonic wave mould of the micro-capacitance sensor structure Type, wherein, the harmonic-model of the micro-capacitance sensor structure includes：The power distribution network of the micro-capacitance sensor access, micro-capacitance sensor access institute State the access point of power distribution network and the power distribution network be included in impedance Z eq between the points of common connection of bulk power grid, the micro-capacitance sensor with The impedance Z L of access point load and the internal driving ZMG of the micro-capacitance sensor between the power distribution network.
- 9. the device according to claim 7 or 8, it is characterised in that second acquisition module includes：First link block, for being attached at least one load bus, power supply source and load by network line, form The model of the power distribution network of the access micro-capacitance sensor, the model of the power distribution network is the unit feeder radial networks, wherein, Any one or more load buses access the access node of the micro-capacitance sensor, access micro- electricity as the power distribution network The model of the power distribution network of net uses constant-impedance pattern.
- 10. device according to claim 9, it is characterised in that the control module includes：Suppression module, for being accessed in the micro-capacitance sensor between the access node and the PCC nodes of the power distribution network In the case that electrical distance exceedes predetermined value, the circuit micro-capacitance sensor accesses the access node of the power distribution network and described Impedance between PCC nodes suppresses the higher harmonic current so that the higher harmonic current is less than predetermined harmonic current.
- 11. the device according to claim 7 or 8, it is characterised in that second acquisition module includes：Second link block, distributed power source, load bus and load are attached for the bus by equivalent power network, structure Into the model of the power distribution network of the access micro-capacitance sensor, the model of the power distribution network is the multinode chain type power distribution network, its In, successively each concentrated load node is numbered to form the distribution since the bus of the equivalent power network along feeder line Net.
- 12. device according to claim 11, it is characterised in that the processing module includes：First sub-acquisition module, for keeping certain with the power harmonic source model that exchanges of the power distribution network in the micro-capacitance sensor In the case of, obtain the access node that the micro-capacitance sensor accesses multiple on-positions of the power distribution network；Second sub-acquisition module, it is bent for obtaining the harmonic voltage distortion rate THDV of access node of each on-position Line；3rd sub-acquisition module, the harmonic voltage distortion rate THDV for the access node based on each on-position are bent Line, to obtain the voltage harmonic aberration rate of the access node of each on-position,Wherein, when single micro-capacitance sensor, if the on-position of the micro-capacitance sensor is less than position apart from the position of the bus bar side Threshold value, then the THDV before the micro-capacitance sensor accesses the node is bigger, and the THDV after micro-capacitance sensor access node is smaller, institute State the voltage harmonic aberration rate that micro-capacitance sensor is accessed after the power distribution network on the line and be less than predetermined value.
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| CN103310121A (en) * | 2013-07-10 | 2013-09-18 | 湖南大学 | Large-scale photovoltaic power station and distribution grid harmonic wave cross-impact analysis model building method |
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| CN103310121A (en) * | 2013-07-10 | 2013-09-18 | 湖南大学 | Large-scale photovoltaic power station and distribution grid harmonic wave cross-impact analysis model building method |
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