CN105337279A - Analysis method and apparatus for harmonic current and harmonic voltage of power grid in access to power distribution network - Google Patents
Analysis method and apparatus for harmonic current and harmonic voltage of power grid in access to power distribution network Download PDFInfo
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- CN105337279A CN105337279A CN201410397023.0A CN201410397023A CN105337279A CN 105337279 A CN105337279 A CN 105337279A CN 201410397023 A CN201410397023 A CN 201410397023A CN 105337279 A CN105337279 A CN 105337279A
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Abstract
The invention discloses an analysis method and apparatus for harmonic current and harmonic voltage of a power grid in access to a power distribution network. The method comprises the steps that the harmonic model of a microgrid structure is obtained; the models of the power distribution network connected to the microgrid are obtained, wherein the models of the power distribution network comprise a single-feeder-line radiation network and a multi-node chain type power distribution network; when the model of the power distribution network is the single-feeder-line radiation network, the amplitude of higher harmonic current generated in the running of the microgrid after the microgrid is connected to the power distribution network is controlled according to electrical distance between an access node and a PCC node of the microgrid in access to the power distribution network; and when the model of the power distribution network is the multi-node chain type power distribution network, the voltage harmonic distortion rate of the circuit after the microgrid is connected to the power distribution network is determined according to the access distance between the access position and the busbar side when the microgrid is connected to the power distribution network. The technical problem that the harmonic wave in the electric energy interaction process of the power distribution network cannot be monitored when the microgrid is connected to the power distribution network is solved.
Description
Technical field
The present invention relates to electrical network field, in particular to analytical method and the device of current and voltage harmonic during a kind of micro-capacitance sensor access power distribution network.
Background technology
Micro-capacitance sensor comprises multiple distributed energy, and distributed power source is mostly grid-connected by power electronics interface, and the harmonic current that power electronic equipment produces likely is injected into power distribution network.In addition, general based on residential electricity consumption in micro-capacitance sensor, most of household electric appliances, with rectification circuit or phase-control circuit, causes current distortion higher.Although micro-capacitance sensor takes some effective measures, as carried out harmonic inhabitation by link output filter, raising switching frequency and improvement control strategy, but inevitably producing a small amount of harmonic current injection to power distribution network, forming harmonic wave secondary pollution.The ratio accounting for power distribution network total load along with micro-capacitance sensor capacity increases gradually, and the access of correct assessment micro-capacitance sensor is on the impact of system harmonics distribution and reasonable disposition distributed power source, and to guarantee electrical network and the reliable optimizing operation of equipment, tool is of great significance.
The problem of the harmonic wave in electric energy reciprocal process cannot be monitored for micro-capacitance sensor access in prior art to power distribution network, not yet propose effective solution at present.
Summary of the invention
Main purpose of the present invention is analytical method and the device of current and voltage harmonic when providing a kind of micro-capacitance sensor access power distribution network, accesses to solve micro-capacitance sensor the problem cannot monitoring the harmonic wave in electric energy reciprocal process to power distribution network.
To achieve these goals, according to an aspect of the embodiment of the present invention, provide the analytical method of current and voltage harmonic during a kind of micro-capacitance sensor access power distribution network.The method comprises: set up micro-capacitance sensor model, and micro-capacitance sensor model comprises: the harmonic-model obtaining micro-capacitance sensor structure; Obtain the model of the power distribution network of access micro-capacitance sensor, the model of power distribution network comprises: unit feeder radial networks and multinode chain type power distribution network; When the model of power distribution network is unit feeder radial networks, after micro-capacitance sensor access power distribution network, access the electrical distance between the access node of power distribution network and PCC node according to micro-capacitance sensor, control the size that micro-capacitance sensor runs the higher harmonic current produced; When the model of power distribution network is multinode chain type power distribution network, after micro-capacitance sensor access power distribution network, according to the access distance of on-position and bus bar side during micro-capacitance sensor access power distribution network, in the voltage harmonic aberration rate of circuit generation after determining micro-capacitance sensor access power distribution network.
To achieve these goals, according to the another aspect of the embodiment of the present invention, provide the analytical equipment of current and voltage harmonic during micro-capacitance sensor access power distribution network.This device comprises: the first acquisition module, for obtaining the harmonic-model of micro-capacitance sensor structure; Second acquisition module, for obtaining the model of the power distribution network of access micro-capacitance sensor, the model of power distribution network comprises: unit feeder radial networks and multinode chain type power distribution network; Control module, for when the model of power distribution network is unit feeder radial networks, after micro-capacitance sensor access power distribution network, access the electrical distance between the access node of power distribution network and PCC node according to micro-capacitance sensor, control the size that micro-capacitance sensor runs the higher harmonic current produced; Processing module, for when the model of power distribution network is multinode chain type power distribution network, after micro-capacitance sensor access power distribution network, according to the access distance of on-position and bus bar side during micro-capacitance sensor access power distribution network, in the voltage harmonic aberration rate of circuit generation after determining micro-capacitance sensor access power distribution network.
According to inventive embodiments, by setting up micro-capacitance sensor model, micro-capacitance sensor model comprises: the harmonic-model obtaining micro-capacitance sensor structure; Obtain the model of the power distribution network of access micro-capacitance sensor, the model of power distribution network comprises: unit feeder radial networks and multinode chain type power distribution network; When the model of power distribution network is unit feeder radial networks, after micro-capacitance sensor access power distribution network, access the electrical distance between the access node of power distribution network and PCC node according to micro-capacitance sensor, control the size that micro-capacitance sensor runs the higher harmonic current produced; When the model of power distribution network is multinode chain type power distribution network, after micro-capacitance sensor access power distribution network, according to on-position during micro-capacitance sensor access power distribution network and the access distance of bus bar side, the voltage harmonic aberration rate occurred at circuit after determining micro-capacitance sensor access power distribution network, reach the effect of the harmonic wave in monitoring electric energy reciprocal process, solve the access of slight electrical network cannot monitor the harmonic wave in electric energy reciprocal process problem to power distribution network.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
The flow chart of the analytical method of current and voltage harmonic when Fig. 1 is the micro-capacitance sensor access power distribution network according to the embodiment of the present invention;
The flow chart of the analytical method of current and voltage harmonic when Fig. 2 is a kind of preferred micro-capacitance sensor access power distribution network according to the embodiment of the present invention;
Fig. 3 is the micro-capacitance sensor canonical system schematic diagram according to the embodiment of the present invention;
Fig. 4 is the micro-capacitance sensor harmonic-model schematic diagram according to the embodiment of the present invention;
Fig. 5 is the unit feeder electricity distribution network model schematic diagram according to the embodiment of the present invention;
Fig. 6 is the chain type distribution net work structure figure containing photovoltaic distributed power source according to the embodiment of the present invention;
Fig. 7 is the harmonic current spectrogram of the micro-capacitance sensor according to the embodiment of the present invention;
Fig. 8 affects schematic diagram according to the micro-capacitance sensor infiltration changed power of the micro-capacitance sensor of embodiment of the present invention access Bus10 to harmonic voltage distortion rate;
Fig. 9 is that the micro-capacitance sensor on-position change being 2.5MW according to the capacity of the embodiment of the present invention affects schematic diagram to feeder line harmonic voltage distortion rate;
Figure 10 is the feeder line harmonic voltage distortion rate curve schematic diagram of the appearance numbering 2 and 4 according to the embodiment of the present invention;
The schematic diagram of the analytical equipment of current and voltage harmonic when Figure 11 is a kind of micro-capacitance sensor access power distribution network according to the embodiment of the present invention;
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
It should be noted that, term " first ", " second " etc. in specification of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged, in the appropriate case so that embodiments of the invention described herein.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
Embodiments provide the analytical method of current and voltage harmonic during a kind of micro-capacitance sensor access power distribution network.
The flow chart of the analytical method of current and voltage harmonic when Fig. 1 is the micro-capacitance sensor access power distribution network according to the embodiment of the present invention.As shown in Figure 1, it is as follows that the analysis side's method of current and voltage harmonic during this micro-capacitance sensor access power distribution network comprises step:
Step S102, obtains the harmonic-model of micro-capacitance sensor structure;
Step S104, obtain the model of the power distribution network of access micro-capacitance sensor, the model of power distribution network comprises: unit feeder radial networks and multinode chain type power distribution network;
Step S106, when the model of power distribution network is unit feeder radial networks, after micro-capacitance sensor access power distribution network, access the electrical distance between the access node of power distribution network and PCC node according to micro-capacitance sensor, control the size that micro-capacitance sensor runs the higher harmonic current produced;
Step S108, when the model of power distribution network is multinode chain type power distribution network, after micro-capacitance sensor access power distribution network, according to the access distance of on-position and bus bar side during micro-capacitance sensor access power distribution network, in the voltage harmonic aberration rate of circuit generation after determining micro-capacitance sensor access power distribution network.
In above-described embodiment, set up the model of micro-capacitance sensor typical structure model and power distribution network based on matlab, by theory analysis and simulation calculation, the harmonic current distribution character containing micro-capacitance sensor power distribution network is analyzed.
What distribute on Distribution Network Harmonics for micro-capacitance sensor access affects problem, when load variations, and the change of each harmonic distribution situation.The model of micro-capacitance sensor typical structure harmonic-model and power distribution network is established, for analyzing the distribution situation of harmonic current in electrical network according to power distribution network CURRENT DISTRIBUTION and voltage's distribiuting two aspect.Voltage's distribiuting aspect, from the impact that micro-capacitance sensor distributes on harmonic wave on the infiltration changed power of power distribution network and on-position, detailed analysis has been carried out to the harmonic voltage distribution character containing micro-capacitance sensor power distribution network, find when not changing the harmonious wave source model of micro-capacitance sensor infiltration power, micro-capacitance sensor introduce position and total harmonic distortion factor relation larger.
The flow chart of the analytical method of current and voltage harmonic when Fig. 2 is a kind of preferred micro-capacitance sensor access power distribution network according to above-described embodiment.According to the analytical method of current and voltage harmonic during above-described embodiment micro-capacitance sensor access power distribution network, wherein also comprise for the step of the harmonic-model obtaining micro-capacitance sensor structure in step S102:
Step S1021, at least one load and distributed power source are encapsulated, form the system model of micro-capacitance sensor, distributed power source comprises following any one or more power-supply device: miniature gas turbine, wind-driven generator, solar generator, wherein, the distributed power source in micro-capacitance sensor accesses power distribution network by power electronic equipment, and distributed Voltage generates harmonic wave, load in micro-capacitance sensor includes rectification circuit or phase-control circuit, generates current distortion;
Step S1023, source lotus characteristic based on the system model of micro-capacitance sensor sets up the harmonic-model of micro-capacitance sensor structure, wherein, the harmonic-model of micro-capacitance sensor structure comprises: the power distribution network of micro-capacitance sensor access, the access point of micro-capacitance sensor access power distribution network and power distribution network count the impedance Z eq between the points of common connection of bulk power grid, the impedance Z L of access point load between micro-capacitance sensor and power distribution network and the internal driving ZMG of micro-capacitance sensor.
Concrete, load together with power package, is shown as a single controlled unit to power distribution network, has source lotus characteristic by micro-capacitance sensor.In micro-capacitance sensor, most distributed power source accesses electrical network by power electronic equipment, can produce a large amount of harmonic waves during its work; In addition, in micro-capacitance sensor, most of household electric appliances is with rectification circuit or phase-control circuit, causes current distortion higher.Therefore, the access of micro-capacitance sensor becomes the potential harmonic source of power distribution network; On the other hand, after the harmonic current injection electrical network in micro-capacitance sensor, can harmonic voltage be produced, also certain influence is produced to the operation of micro-capacitance sensor.In order to explain the harmonic characterisitic after micro-capacitance sensor access electrical network more accurately, the harmonic-model of micro-capacitance sensor in power distribution network will be set up below.
For a typical micro-grid system containing miniature gas turbine, wind power generation, photovoltaic generation, energy storage and load as Fig. 3, consider the impact of its regenerative resource such as inner wind power generation and photovoltaic generation by natural conditions, power output is random and discontinuous, therefore can think that micro-capacitance sensor is power supply or part throttle characteristics in certain operation period general performance.Above-described embodiment intends the harmonic-model setting up typical micro-grid system based on the source lotus characteristic of micro-capacitance sensor.
Such as, study with the 380V three-phase low-voltage power distribution network that current application surface is the widest, the model set up as shown in Figure 4.Wherein, Zeq represents the impedance between points of common connection that micro-capacitance sensor access point and power distribution network access bulk power grid; ZL is the equiva lent impedance of access point load; ZMG represents the internal driving of micro-capacitance sensor.
The spectral range producing harmonic wave when micro-capacitance sensor runs is very large, wherein low order (low frequency) harmonic wave can be adopted some effective means by microgrid inside, as suppressed by link output filter, raising switching frequency and improvement control strategy, and due to power distribution network low-frequency impedance less, in most of the cases it is also less on the impact of Distribution Network Harmonics characteristic.For this reason, main micro-capacitance sensor of paying close attention to runs the high order harmonic component of generation to the impact of Distribution Network Harmonics characteristic herein.
Preferably, according to any one embodiment above-mentioned, wherein also comprise for the step of the model also comprising the power distribution network obtaining access micro-capacitance sensor in step S104:
Step S1041, by network line, at least one load bus, power supply source are connected with load, form the model of the power distribution network of access micro-capacitance sensor, the model of power distribution network is unit feeder radial networks, wherein, any one or more load bus is as the access node of power distribution network access micro-capacitance sensor, and the model of the power distribution network of access micro-capacitance sensor adopts constant-impedance pattern.
The flow chart of the analytical method of current and voltage harmonic during a kind of preferred micro-capacitance sensor access power distribution network according to above-described embodiment.According to the analytical method of current and voltage harmonic during above-described embodiment micro-capacitance sensor access power distribution network, wherein in step S106 for according to the electrical distance between the micro-capacitance sensor access access node of power distribution network and PCC node, control the step that micro-capacitance sensor runs the size of the higher harmonic current produced and also comprise:
The electrical distance of step S1061 between the access node and PCC node of micro-capacitance sensor access power distribution network exceedes predetermined value, impedance between the access node of circuit micro-capacitance sensor access power distribution network and PCC node suppresses higher harmonic current, makes higher harmonic current be less than predetermined harmonic current.
Concrete, the implication that the legend symbol in Fig. 5 represents is as follows: horizontal line "---" represents LV network line, and arrow " → " represents user load, and asterisk " " represents overhead line pole, hollow rectangular rectangle
represent tie point
As shown in Figure 5, be that the unit feeder radial networks of 0.4kV is example with electric pressure, wherein, these 5 nodes of N3l, N44, N61, N91, N101 are load bus, and the access point of micro-capacitance sensor is generally selected in load bus.From the angle of research harmonic characterisitic, use only constant-impedance pattern herein, namely power distribution network institute bringing onto load is RL load.
In order to study in micro-capacitance sensor high order harmonic component to the impact of Distribution Network Harmonics characteristic, adopt simulation model, identical micro-capacitance sensor is accessed respectively 5 load buses in power distribution network, calculate the size of micro-capacitance sensor access point switching frequency sideband harmonic current and voltage, result is 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, being micro-capacitance sensor when accessing difference in power distribution network respectively, shown in access point harmonic current and voltmeter 1, is micro-capacitance sensor when accessing difference in power distribution network respectively, access point harmonic current and voltage effective value.Known to analysis of simulation result, due to the equiva lent impedance ZL>>Zeq (under harmonic frequency) of access point load, the high-frequency harmonic electric current that the inner a large amount of power electronic equipment work of micro-capacitance sensor produces, major part all flows to PCC point through distribution network line and enters electrical network, and on Zeq, produce harmonic wave pressure drop.Therefore, along with micro-capacitance sensor access point is away from PCC point, Zeq and the harmonic voltage of access point equivalence increase all thereupon.
Table 2:
| N2 | N3 | N31 | N4 | N5 | N6 | N7 | N8 | N9 | N10 | N101 | |
| Fs-1 time | 0.79 | 1.5 | 1.98 | 1.49 | 1.49 | 1.49 | 1.49 | 1.49 | 1.49 | 1.49 | 1.48 |
| Fs+1 time | 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 time | 0.97 | 1.41 | 1.41 | 1.86 | 2.31 | 2.76 | 3.22 | 3.68 | 4.13 | 4.58 | 4.97 |
| Fs+1 time | 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, be micro-capacitance sensor when accessing N31 and N101 point respectively, the harmonic voltage effective value of each node and the aberration rate (THDV) of voltage in power distribution network.Be not difficult to find from simulation result, with micro-capacitance sensor access point for boundary, the closer to the node of PCC, less by micro-capacitance sensor harmonic influence, and the node that electrical distance is farther compared with micro-capacitance sensor access point, the characteristic of its harmonic voltage is then substantially identical with micro-capacitance sensor access point.
By to the modeling of micro-capacitance sensor typical structure and power distribution network and the simulation calculation of harmonic characterisitic, grasp the impact of micro-capacitance sensor access on Distribution Network Harmonics characteristic.First, after micro-capacitance sensor access power distribution network, higher harmonic current is very large by the impact of impedance between micro-capacitance sensor access point and PCC point, and electrical distance is far away, and line impedance is larger, and stronger to the inhibitory action of higher harmonic current, higher harmonic current is less.Secondly, due to the high order harmonic component impedance between access point and PCC point, the equiva lent impedance of electrical distance more distal part in load and power distribution network, the higher harmonic current major part of micro-capacitance sensor access generation has all flowed to PCC node.Finally, for above-mentioned reasons, when multiple micro-capacitance sensor access power distribution network, use percent harmonic distortion merely, be sometimes difficult to the harmonic characterisitic of accurate evaluation electrical network.
Preferably, the analytical method of current and voltage harmonic during a kind of micro-capacitance sensor access power distribution network preferred embodiment, wherein also comprises for the step of the model obtaining the power distribution network of access micro-capacitance sensor in step S104:
Step S1043, by the bus of equivalent electrical network, distributed power source, load bus are connected with load, form the model of the power distribution network of access micro-capacitance sensor, the model of power distribution network is multinode chain type power distribution network, wherein, from the bus of equivalent electrical network, successively each concentrated load node is numbered formation power distribution network along feeder line.
Preferably, according to above-mentioned execution mode, wherein in step S108 according to the access distance of on-position and bus bar side during micro-capacitance sensor access power distribution network, also comprise in the step of the voltage harmonic aberration rate of circuit generation after determining micro-capacitance sensor access power distribution network:
Step S1081, when the exchange power of micro-capacitance sensor and power distribution network and Harmonic source model keep certain, obtains the access node of multiple on-positions of micro-capacitance sensor access power distribution network;
Step S1083, obtains the harmonic voltage distortion rate THDV curve of the access node of each on-position;
Step S1085, based on the harmonic voltage distortion rate THDV curve of the access node of each on-position, obtains the voltage harmonic aberration rate of the access node of each on-position,
Wherein, when single micro-capacitance sensor, if the position of the on-position distance bus bar side of micro-capacitance sensor is less than position threshold, THDV then before micro-capacitance sensor access node is larger, and THDV after micro-capacitance sensor access node is less, after micro-capacitance sensor access power distribution network, voltage harmonic aberration rate is on the line lower than predetermined value.
Concrete, the present embodiment adopts multinode chain type power distribution network example to carry out harmonic analysis, and its load model adopts invariable power static load model.Along feeder line, each concentrated load is considered as a node also to be numbered, compiles as Busl, Bus2 from the Bus0 bus of equivalent electrical network successively ... BusN (N=20), forms power distribution network as shown in Figure 6.
Equivalence electrical network busbar voltage is taken as UBus=1.02, and it is all per unit values relative to SBus=10MVA benchmark that all loads and micro-capacitance sensor permeate power, voltage base value VBus=380V.Make Bus0 bus be system balancing node, voltage is UBus0=1.02 ∠ 0 °.Each section of circuit of supposing the system is not long, and its shunt capacitance is relatively little, can ignore, and only considers series resistance and the reactance of circuit.The total active power load of system is 0.4963pu, and load or burden without work is 0.5067Pu.Wherein, end BusN bus place is connected to nonlinear-load, and its harmonic wave type is 6 pulse current source models; All the other are linear load.Each section of transmission line impedance and each node load, 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 adopts typical structure access electrical network, measures the current waveform flowed out from micro-capacitance sensor.Equally spaced to sample within each cycle of micro-capacitance sensor current waveform 128 points, and utilize MATLAB software to carry out Fourier analysis to sampled value, obtain the frequency spectrum of harmonic current as shown in Figure 7.
Distributed power source in micro-capacitance sensor utilizes the renewable resource generatings such as a large amount of wind energies, solar energy, the output of energy affects by the extraneous factor such as geographic basis, weather and climate, cause the Power Exchange characteristic of micro-capacitance sensor and power distribution network complicated, certainly will impact the quality of voltage of power distribution network.This section adopts same network and load data, analyzes the impact that micro-capacitance sensor infiltration changed power distributes on Distribution Network Harmonics.The on-position (Bus10) of micro-capacitance sensor and Harmonic source model keep certain, change its infiltration power to power distribution network, as table 5 during change, system loading growth pattern is that the inner full load equal proportion of power distribution network increases, and keep power factor constant, adopt grid side power supply to bear the scheduling mode of exerting oneself of whole load growth.The situation of change of simulation analysis system harmonic voltage distortion rate THDV.
Table 5:
As seen from Figure 8, along with micro-capacitance sensor is to the increase gradually of power distribution network infiltration power, feeder line each node voltage percent harmonic distortion along the line raises gradually.When micro-capacitance sensor infiltration power reaches certain value, as the situation of numbering 4 and numbering 5, the maximum of node THDV along the line will not appear at the feeder terminal that nonlinear-load accesses, but at the access node of micro-capacitance sensor.Infiltration power is that compared with the micro-capacitance sensor of 20MW is the micro-capacitance sensor of 0.1MW with infiltration power, feeder terminal node THDV adds 3 times, and the THDV of micro-capacitance sensor access node Bus10 adds 11 times.And, some the serious node that distorts (Bus9 to Bus20 node of numbering 4 feeder line, Bus7 to the Bus20 node of numbering 5 feeder line) THDV exceeded the limit value 5% of harmonic voltage distortion rate, the highest aberration rate reaches 7.37%, occurs in the Bus10 Nodes of numbering 5 feeder line.
Result shows, when not changing micro-capacitance sensor on-position and Harmonic source model, on feeder line, THDV is by the infiltration power decision of micro-capacitance sensor, its infiltration power is larger, the ratio accounting for total load is higher, feeder line each node voltage percent harmonic distortion along the line is larger. in this case, just need the exchange power of conservative control micro-capacitance sensor and distribution.
Adopt same network and load data, analyze the change of micro-capacitance sensor on-position to the impact of Distribution Network Harmonics distribution.The exchange power of micro-capacitance sensor and power distribution network and Harmonic source model keep necessarily, and run with lagging power-factor 0.9, its on-position as table 6 change time, the situation of change of simulation analysis system harmonic voltage distortion rate THDV.
Table 6:
| Numbering | 1 | 2 | 3 | 4 | 5 |
| Microgrid on-position | Bus2 | Bus8 | Bus14 | Bus19 | Bus20 |
The capacity getting micro-capacitance sensor is 2.5MW, and with position access electrical network various in table 6, respectively to its emulation, the harmonic voltage distortion rate THDV curve of each node of gained feeder line as shown in Figure 9.
As shown in Figure 9, the crosspoint between each curve is more, and along with the change of micro-capacitance sensor access node, the situation of change of feeder line each node THDV is also inconsistent.Therefore, for the ease of analyzing, list separately the harmonic voltage distortion rate curve of feed connection node in numbering 2 and numbering 4 two kinds of situations, as shown in Figure 10.
As seen from Figure 10, when micro-capacitance sensor on-position is Bus8, Bus8 and the harmonic voltage distortion rate of front nodal point large when being Bus19 than on-position, THDV is 0.3% to the maximum; The harmonic voltage distortion rate of the posterior nodal point of Bus8 is little when being Bus19 than micro-capacitance sensor on-position, and THDV is 4.4% to the maximum.Compared with when being Bus19 with on-position when micro-capacitance sensor on-position is Bus14, Busl4 and the harmonic voltage distortion rate of front nodal point want large, the harmonic voltage distortion rate of the posterior nodal point of Bus14 is little.So when single micro-capacitance sensor, its on-position is more close to system busbar, THDV before micro-capacitance sensor access node is larger, and THDV after micro-capacitance sensor access node is less, but the degree varies samples of two kinds of changes, be also reduction of the harmonic distortion level of circuit generally.When multiple micro-capacitance sensor disperses distribution on feeder line, its THDV curve is higher than THDV curve during micro-capacitance sensor closer feeder line head end position, lower than THDV curve during micro-capacitance sensor closer feeder terminal position.Compared with being Node B us2 with on-position, when micro-capacitance sensor on-position is Bus19, feeder terminal node voltage percent harmonic distortion adds 4.81%, and Node B us19 voltage harmonic aberration rate increases 5%, and Node B us2 voltage harmonic aberration rate reduces 0.2%.And as micro-capacitance sensor access node Bus19, the THDV of Bus15 to Bus20 node has exceeded the limit value 5% of harmonic voltage distortion rate, and the highest aberration rate reaches 6.76%.
Result shows, the on-position of micro-capacitance sensor is the closer to the closer to bus bar side, and the THDV before micro-capacitance sensor access node is larger, and THDV after micro-capacitance sensor access node is less, but the degree varies sample of both changes, the harmonic distortion level of circuit is lower generally.Otherwise distance line end is far away, the harmonic effects caused system is larger.
By simulation calculation, changed power is exchanged on micro-capacitance sensor and power distribution network and detailed analysis has been carried out to the impact that harmonic wave distributes in micro-capacitance sensor on-position.
When not changing micro-capacitance sensor on-position and Harmonic source model, on feeder line, THDV is by the infiltration power decision of micro-capacitance sensor to power distribution network, and its infiltration power is larger, and the ratio accounting for total load is higher, and feeder line each node voltage percent harmonic distortion along the line is larger.
When not changing micro-capacitance sensor wave source model harmonious with the infiltration power of power distribution network, the on-position of micro-capacitance sensor is the closer to the closer to bus bar side, and the harmonic distortion level of circuit is lower generally.Otherwise distance line end is far away, the harmonic effects caused system is larger.
The embodiment of the present invention additionally provides the analytical equipment of current and voltage harmonic during a kind of micro-capacitance sensor access power distribution network.The analytical method of current and voltage harmonic when this device can access power distribution network by micro-capacitance sensor realizes its function.It should be noted that, the analytical method of the current and voltage harmonic when analytical equipment of current and voltage harmonic during the micro-capacitance sensor access power distribution network of the embodiment of the present invention may be used for performing the micro-capacitance sensor access power distribution network that the embodiment of the present invention provides, the analytical equipment of the current and voltage harmonic during micro-capacitance sensor access power distribution network that the analytical method of the current and voltage harmonic during micro-capacitance sensor access power distribution network of the embodiment of the present invention also can be provided by the embodiment of the present invention performs.
The schematic diagram of the analytical equipment of current and voltage harmonic when Figure 11 is the micro-capacitance sensor access power distribution network according to the embodiment of the present invention.As shown in figure 11, the analytical equipment of current and voltage harmonic during this kind of preferred micro-capacitance sensor access power distribution network comprises:
First acquisition module 110, for obtaining the harmonic-model of micro-capacitance sensor structure;
Second acquisition module 112, for obtaining the model of the power distribution network of access micro-capacitance sensor, the model of power distribution network comprises: unit feeder radial networks and multinode chain type power distribution network;
Control module 114, for when the model of power distribution network is unit feeder radial networks, after micro-capacitance sensor access power distribution network, access the electrical distance between the access node of power distribution network and PCC node according to micro-capacitance sensor, control the size that micro-capacitance sensor runs the higher harmonic current produced;
Processing module 116, for when the model of power distribution network is multinode chain type power distribution network, after micro-capacitance sensor access power distribution network, according to the access distance of on-position and bus bar side during micro-capacitance sensor access power distribution network, in the voltage harmonic aberration rate of circuit generation after determining micro-capacitance sensor access power distribution network.
First acquisition module 110 of this device can comprise:
Package module 1101, for at least one load and distributed power source are encapsulated, form the system model of micro-capacitance sensor, distributed power source comprises following any one or more power-supply device: miniature gas turbine, wind-driven generator, solar generator, wherein, the distributed power source in micro-capacitance sensor accesses power distribution network by power electronic equipment, and distributed Voltage generates harmonic wave, load in micro-capacitance sensor includes rectification circuit or phase-control circuit, generates current distortion;
Set up module 1103, source lotus characteristic for the system model based on micro-capacitance sensor sets up the harmonic-model of micro-capacitance sensor structure, wherein, the harmonic-model of micro-capacitance sensor structure comprises: the power distribution network of micro-capacitance sensor access, the access point of micro-capacitance sensor access power distribution network and power distribution network count the impedance Z eq between the points of common connection of bulk power grid, the impedance Z L of access point load between micro-capacitance sensor and power distribution network and the internal driving ZMG of micro-capacitance sensor.
Preferably, the second acquisition module 112 of this device can comprise:
First link block 1121, for at least one load bus, power supply source being connected with load by network line, form the model of the power distribution network of access micro-capacitance sensor, the model of power distribution network is unit feeder radial networks, wherein, any one or more load bus is as the access node of power distribution network access micro-capacitance sensor, and the model of the power distribution network of access micro-capacitance sensor adopts constant-impedance pattern.
Preferably, the control module 114 of this device can comprise:
Suppression module 1141, when exceeding predetermined value for the electrical distance between the access node and PCC node of micro-capacitance sensor access power distribution network, impedance between the access node of circuit micro-capacitance sensor access power distribution network and PCC node suppresses higher harmonic current, makes higher harmonic current be less than predetermined harmonic current.
In conjunction with above-described embodiment, the second acquisition module 112 of this device can also comprise:
Second link block 1123, for the bus by equivalent electrical network, distributed power source, load bus are connected with load, form the model of the power distribution network of access micro-capacitance sensor, the model of power distribution network is multinode chain type power distribution network, wherein, from the bus of equivalent electrical network, successively each concentrated load node is numbered formation power distribution network along feeder line.
Preferably, according to above-described embodiment, this device processing module comprises 116 and also comprises:
First sub-acquisition module 1161, for when the exchange power of micro-capacitance sensor and power distribution network and Harmonic source model keep certain, obtains the access node of multiple on-positions of micro-capacitance sensor access power distribution network;
Second sub-acquisition module 1163, for obtaining the harmonic voltage distortion rate THDV curve of the access node of each on-position;
3rd sub-acquisition module 1165, for the harmonic voltage distortion rate THDV curve of the access node based on each on-position, obtains the voltage harmonic aberration rate of the access node of each on-position,
Wherein, when single micro-capacitance sensor, if the position of the on-position distance bus bar side of micro-capacitance sensor is less than position threshold, THDV then before micro-capacitance sensor access node is larger, and THDV after micro-capacitance sensor access node is less, after micro-capacitance sensor access power distribution network, voltage harmonic aberration rate is on the line lower than predetermined value.
Now with micro-capacitance sensor operation conditions for example, sampling analysis is carried out to micro-grid connection point voltage electric current, and under analyzing the not enough situation of energy storage, each primary current harmonic content when microgrid exchanges power.
1. micro-grid connection point voltage testing current:
This part is under different conditions, and energy storage the voltage of site and the electric current flow through are tested, during grid-connected charging, the grid-connected point voltage of energy storage with flow through electric current; Grid-connected charging grid-connected point voltage and flow through electric current when being with the resistive load of 10kW.Can find out, under above-mentioned two kinds of different conditions, voltage waveform is good; Charging current waveform is better; When throwing load, energy storage transfers electric discharge to by charging, and discharging current is less, and output current harmonics content is higher.
2. microgrid output current harmonics content
As can be seen from above-mentioned current waveform, under microgrid overload situations, output current harmonics content is comparatively large, analyzes and researches with regard to its concrete harmonic wave distribution situation.
Be below respectively under the resistive load condition of 0kW, 10kW and 30kW, energy storage side output current is tested, observe and record current harmonic content (representing with the percentage of fundamental voltage amplitude) change.When load variations, energy storage transfers discharge condition to by charged state, and when discharging current is larger, current waveform shows good sine degree, and harmonic content is lower.Carry out harmonic content analysis to above-mentioned electric current respectively, when low current charge, energy storage charging current waveform is poor, and 3 times larger with 7 subharmonic content; After input 10kW load, energy storage has charging to transfer electric discharge to, and when low discharging current, energy storage charging current waveform is poor, and 3 times, 5 times larger with 7 subharmonic content; After load increases further, energy storage electric discharge harmonic current improves, 3 times, 7 subharmonic currents are main; In the ever-increasing process of load, energy storage electric discharge harmonic current is closer to rated condition, and individual harmonic current content reduces.
Test carries out when energy storage inverter supports, there is no the evaluation criterion about energy storage inverter at present, with reference to GB " GB/T14549-1993 quality of power supply utility network harmonic wave ", the maximum output capacity 110kVA of inverter, can find out, in above-mentioned unequally loaded situation, harmonic content meets the requirement of inverter output harmonic wave, but energy storage is operated under rated condition can the content of harmonic reduction electric current.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. an analytical method for current and voltage harmonic during micro-capacitance sensor access power distribution network, is characterized in that, comprising:
Obtain the harmonic-model of micro-capacitance sensor structure;
Obtain the model of the power distribution network of the described micro-capacitance sensor of access, the model of described power distribution network comprises: unit feeder radial networks and multinode chain type power distribution network;
When the model of described power distribution network is described unit feeder radial networks, after described micro-capacitance sensor accesses described power distribution network, access the electrical distance between the access node of described power distribution network and PCC node according to described micro-capacitance sensor, control the size that described micro-capacitance sensor runs the higher harmonic current produced;
When the model of described power distribution network is described multinode chain type power distribution network, after described micro-capacitance sensor accesses described power distribution network, on-position when accessing described power distribution network according to described micro-capacitance sensor and the access distance of bus bar side, determine described micro-capacitance sensor access described power distribution network after the voltage harmonic aberration rate that occurs at circuit.
2. method according to claim 1, is characterized in that, the step obtaining the harmonic-model of micro-capacitance sensor structure comprises:
At least one load and distributed power source are encapsulated, form the system model of described micro-capacitance sensor, described distributed power source comprises following any one or more power-supply device: miniature gas turbine, wind-driven generator, solar generator, wherein, distributed power source in described micro-capacitance sensor accesses described power distribution network by power electronic equipment, distributed Voltage generates harmonic wave, and the described load in described micro-capacitance sensor includes rectification circuit or phase-control circuit, generates current distortion;
Source lotus characteristic based on the system model of described micro-capacitance sensor sets up the harmonic-model of described micro-capacitance sensor structure, wherein, the harmonic-model of described micro-capacitance sensor structure comprises: the power distribution network of described micro-capacitance sensor access, described micro-capacitance sensor access the impedance Z eq between points of common connection that the access point of described power distribution network and described power distribution network count bulk power grid, the impedance Z L of access point load between described micro-capacitance sensor and described power distribution network and the internal driving ZMG of described micro-capacitance sensor.
3. method according to claim 1 and 2, is characterized in that, the step obtaining the model of the power distribution network of the described micro-capacitance sensor of access comprises:
By network line, at least one load bus, power supply source are connected with load, form the model of the power distribution network of the described micro-capacitance sensor of described access, the model of described power distribution network is described unit feeder radial networks, wherein, any one or more load bus accesses the access node of described micro-capacitance sensor as described power distribution network, and the model of the power distribution network of the described micro-capacitance sensor of described access adopts constant-impedance pattern.
4. method according to claim 3, is characterized in that, accesses the electrical distance between the access node of described power distribution network and PCC node according to described micro-capacitance sensor, and the step controlling the size of the higher harmonic current that the operation of described micro-capacitance sensor produces comprises:
When the described micro-capacitance sensor electrical distance accessed between the described access node of described power distribution network and described PCC node exceedes predetermined value, the impedance that described circuit micro-capacitance sensor accesses between the described access node of described power distribution network and described PCC node suppresses described higher harmonic current, makes described higher harmonic current be less than predetermined harmonic current.
5. method according to claim 1 and 2, is characterized in that, the step obtaining the model of the power distribution network of the described micro-capacitance sensor of access comprises:
By the bus of equivalent electrical network, distributed power source, load bus are connected with load, form the model of the power distribution network of the described micro-capacitance sensor of described access, the model of described power distribution network is described multinode chain type power distribution network, wherein, from the bus of described equivalent electrical network, successively each concentrated load node is numbered the described power distribution network of formation along feeder line.
6. method according to claim 5, it is characterized in that, after described micro-capacitance sensor accesses described power distribution network, on-position when accessing described power distribution network according to described micro-capacitance sensor and the access distance of bus bar side, determine described micro-capacitance sensor access described power distribution network after the step of voltage harmonic aberration rate that occurs at circuit comprise:
When the exchange power of described micro-capacitance sensor and described power distribution network and Harmonic source model keep certain, obtain the access node that described micro-capacitance sensor accesses multiple on-positions of described power distribution network;
Obtain the harmonic voltage distortion rate THDV curve of the access node of each on-position described;
Based on the harmonic voltage distortion rate THDV curve of the access node of each on-position described, 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 described micro-capacitance sensor is less than position threshold apart from the position of described bus bar side, then the THDV that accesses before described node of described micro-capacitance sensor is larger, and THDV after micro-capacitance sensor access node is less, described micro-capacitance sensor after accessing described power distribution network voltage harmonic aberration rate on the line lower than predetermined value.
7. an analytical equipment for current and voltage harmonic during micro-capacitance sensor access power distribution network, is characterized in that, comprising:
First acquisition module, for obtaining the harmonic-model of micro-capacitance sensor structure;
Second acquisition module, for obtaining the model of the power distribution network accessing described micro-capacitance sensor, the model of described power distribution network comprises: unit feeder radial networks and multinode chain type power distribution network;
Control module, for when the model of described power distribution network is described unit feeder radial networks, after described micro-capacitance sensor accesses described power distribution network, access the electrical distance between the access node of described power distribution network and PCC node according to described micro-capacitance sensor, control the size that described micro-capacitance sensor runs the higher harmonic current produced;
Processing module, for when the model of described power distribution network is described multinode chain type power distribution network, after described micro-capacitance sensor accesses described power distribution network, on-position when accessing described power distribution network according to described micro-capacitance sensor and the access distance of bus bar side, determine described micro-capacitance sensor access described power distribution network after the voltage harmonic aberration rate that occurs at circuit.
8. device according to claim 7, is characterized in that, described first acquisition module comprises:
Package module, for at least one load and distributed power source are encapsulated, form the system model of described micro-capacitance sensor, described distributed power source comprises following any one or more power-supply device: miniature gas turbine, wind-driven generator, solar generator, wherein, distributed power source in described micro-capacitance sensor accesses described power distribution network by power electronic equipment, distributed Voltage generates harmonic wave, described load in described micro-capacitance sensor includes rectification circuit or phase-control circuit, generates current distortion;
Set up module, source lotus characteristic for the system model based on described micro-capacitance sensor sets up the harmonic-model of described micro-capacitance sensor structure, wherein, the harmonic-model of described micro-capacitance sensor structure comprises: the power distribution network of described micro-capacitance sensor access, described micro-capacitance sensor access the impedance Z eq between points of common connection that the access point of described power distribution network and described power distribution network count bulk power grid, the impedance Z L of access point load between described micro-capacitance sensor and described power distribution network and the internal driving ZMG of described micro-capacitance sensor.
9. the device according to claim 7 or 8, is characterized in that, described second acquisition module comprises:
First link block, for at least one load bus, power supply source being connected with load by network line, form the model of the power distribution network of the described micro-capacitance sensor of described access, the model of described power distribution network is described unit feeder radial networks, wherein, any one or more load bus accesses the access node of described micro-capacitance sensor as described power distribution network, and the model of the power distribution network of the described micro-capacitance sensor of described access adopts constant-impedance pattern.
10. device according to claim 9, is characterized in that, described control module comprises:
Suppression module, for at described micro-capacitance sensor, the electrical distance accessed between the described access node of described power distribution network and described PCC node exceedes predetermined value, the impedance that described circuit micro-capacitance sensor accesses between the described access node of described power distribution network and described PCC node suppresses described higher harmonic current, makes described higher harmonic current be less than predetermined harmonic current.
11. devices according to claim 7 or 8, it is characterized in that, described second acquisition module comprises:
Second link block, for the bus by equivalent electrical network, distributed power source, load bus are connected with load, form the model of the power distribution network of the described micro-capacitance sensor of described access, the model of described power distribution network is described multinode chain type power distribution network, wherein, from the bus of described equivalent electrical network, successively each concentrated load node is numbered the described power distribution network of formation along feeder line.
12. devices according to claim 11, is characterized in that, described processing module comprises:
First sub-acquisition module, for when the exchange power of described micro-capacitance sensor and described power distribution network and Harmonic source model keep certain, obtains the access node that described micro-capacitance sensor accesses multiple on-positions of described power distribution network;
Second sub-acquisition module, for obtaining the harmonic voltage distortion rate THDV curve of the access node of each on-position described;
3rd sub-acquisition module, for the harmonic voltage distortion rate THDV curve of the access node based on each on-position described, obtains the voltage harmonic aberration rate of the access node of each on-position,
Wherein, when single micro-capacitance sensor, if the on-position of described micro-capacitance sensor is less than position threshold apart from the position of described bus bar side, then the THDV that accesses before described node of described micro-capacitance sensor is larger, and THDV after micro-capacitance sensor access node is less, described micro-capacitance sensor after accessing described power distribution network voltage harmonic aberration rate on the line lower than predetermined value.
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