CN107464482A - A kind of flexible direct current power network dynamic analog circuit - Google Patents
A kind of flexible direct current power network dynamic analog circuit Download PDFInfo
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- CN107464482A CN107464482A CN201710433221.1A CN201710433221A CN107464482A CN 107464482 A CN107464482 A CN 107464482A CN 201710433221 A CN201710433221 A CN 201710433221A CN 107464482 A CN107464482 A CN 107464482A
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- bridge arm
- resistance
- arm inductance
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- voltage source
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- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/18—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism
- G09B23/183—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism for circuits
Abstract
The present invention provides a kind of flexible direct current power network dynamic analog circuit, including multiple bridge arm inductance, each described bridge arm inductance difference one controlled voltage source of differential concatenation, the controlled voltage of the controlled voltage source is the voltage of the stray resistance of the bridge arm inductance, the equivalent resistance of the controlled voltage source is that C-V characteristic is negative resistance, for reducing the stray resistance of the bridge arm inductance.In flexible direct current power network dynamic analog circuit, the voltage source that is controlled by differential concatenation by bridge arm inductance stray resistance, it is equivalent go out a C-V characteristic be negative resistance, realize negative-resistance-compensated.The circuit can reduce the stray resistance of bridge arm inductance, make the stray resistance perunit value of dynamic analog circuit bridge arm inductance close to the stray resistance perunit value of Practical Project bridge arm inductance, reduce the loss of bridge arm inductance, so as to reduce the loss of converter valve in dynamic simulator system, improve the simulation precision of dynamic simulator system, it is ensured that voltage, electric current are consistent with Practical Project.
Description
Technical field
The present invention relates to flexible DC power transmission dynamic Simulation Techniques field, and in particular to a kind of flexible direct current power network dynamic analog
Intend circuit.
Background technology
With the progress and development of Power Electronic Technique, Technology of HVDC based Voltage Source Converter is solving remote, large capacity transmission,
It is distinctive that its is all shown during the problems that the distributed access power network of new energy and super-huge alternating current-direct current mixing power network face
Advantage.As the HVDC Transmission Technology of a new generation, flexible DC power transmission is change and the direct current network that power network conveys electric energy mode
Structure provide effective solution.However, based on the straight-flow system of Technology of HVDC based Voltage Source Converter in operation mechanism, core
There is significant difference in equipment, control protection etc. so that test necessary hand as planning and designing and equipment with traditional power network
The emulation technology of section encounters new challenge, and then numerical model analysis simulated power interconnection technique is just arisen at the historic moment.The technology is profit
Digital side and physical side are combined with interface equipments such as power amplifier, digital-to-analogue and Analog to Digital Converter, realize active power and
Reactive power transmitted in both directions, traditional real-timedigital simulation and physics dynamic simulative emulation is set to have complementary advantages, can flexibly, conveniently
Change parameter setting, there is versatile and big, while clear concept of simulating scale, can accurately and visually simulate by
Switch time is modularization multi-level converter (the modular multilevel that nanosecond-Microsecond grade power electronic devices is formed
Converter, MMC) physics dynamic analog platform complex nonlinear physical phenomenon, be increasingly becoming for MMC converter valves emulate
The important means of research.
Dynamic power system simulations belong to the physical analogy of power system, and employ has same physical with prototype system
The consistent analog element of the perunit value of matter and parameter, power system physical model is established according to the principle of similitude.Flexible DC power transmission
The dynamic analog of system advantageously reduces voltage class of electric power system, is easy to enter the characteristic and problem of flexible direct current power transmission system
Row research.But in the valve base control device experiment of converter valve, compared with compliance DC engineering, flexible DC power transmission dynamic
The loss of converter valve is higher in analog platform, can not truly reflect the situation of Practical Project.This causes the electricity of dynamic simulator system
Pressure, the current waveform difference compared with actual are more, and the bridge arm current waveform of especially dynamic simulator system can not accurately reflect reality
The harmonic characterisitic of border engineering.
By calculating, in Practical Project, the overall losses of converter valve are 1.1% or so；And on dynamic analog platform,
The overall losses of converter valve are 2%~3%.The loss of converter valve can be divided into switching device loss, bridge arm inductor loss, submodule
This four part is lost in block capacity loss and connection line.Wherein, bridge arm inductor loss proportion is maximum.In addition, dynamic analog
The stray resistance perunit value of system bridge arm inductance is bigger than normal than the stray resistance perunit value of Practical Project bridge arm inductance.Therefore,
How stray resistance and its loss of dynamic simulator system bridge arm inductance is reduced, the simulation essence for improving dynamic analog platform
Spend significant.
The content of the invention
The technical problem to be solved in the present invention in existing flexible DC power transmission dynamic simulator system is overcome due to changing
Flowing the loss of valve higher causes that simulation precision is low, the defects of being difficult to truly reflect Practical Project.
The present invention provides a kind of flexible direct current power network dynamic analog circuit, including multiple bridge arm inductance, each bridge arm
Inductance distinguishes one controlled voltage source of differential concatenation, and the controlled voltage of the controlled voltage source is the stray electrical of the bridge arm inductance
The voltage of resistance, the equivalent resistance of the controlled voltage source is that C-V characteristic is negative resistance, for reducing the bridge arm inductance
Stray resistance.
Preferably, the voltage of the controlled voltage source and the voltage of the stray resistance of the bridge arm inductance meet formula (1)：
UVCVS=-xUr (1)
In formula (1), UVCVSFor the voltage of the controlled voltage source；X is proportionality coefficient, and span is 0~1；UrTo be described
The voltage of the stray resistance of bridge arm inductance.
Preferably, stray resistance and the controlled voltage source of the equivalent resistance of the bridge arm inductance for the bridge arm inductance
Equivalent resistance sum.
Preferably, best proportion coefficient xbAs shown in formula (2)：
In formula (2), r is the stray resistance of the bridge arm inductance；rbFor the stray resistance of Practical Project bridge arm inductance.
Preferably, the voltage of the controlled voltage source, the bridge arm inductance stray resistance voltage, the bridge arm inductance
Equivalent resistance, the stray resistance of the bridge arm inductance, the equivalent resistance of the controlled voltage source and the Practical Project jackshaft
The stray resistance of arm inductance is perunit value.
Technical solution of the present invention, have the following advantages that：
The present invention provides a kind of flexible direct current power network dynamic analog circuit, including multiple bridge arm inductance, each bridge arm
Inductance distinguishes one controlled voltage source of differential concatenation, and the controlled voltage of the controlled voltage source is the stray electrical of the bridge arm inductance
The voltage of resistance, the equivalent resistance of the controlled voltage source is that C-V characteristic is negative resistance, for reducing the bridge arm inductance
Stray resistance.In flexible direct current power network dynamic analog circuit, the electricity that is controlled by differential concatenation by bridge arm inductance stray resistance
Potential source, it is equivalent go out C-V characteristic be negative resistance, realize negative-resistance-compensated.The circuit can reduce the spuious of bridge arm inductance
Resistance, make the stray resistance perunit value of dynamic analog circuit bridge arm inductance close to the stray resistance of Practical Project bridge arm inductance
Perunit value, reduce the loss of bridge arm inductance, so as to reduce the loss of converter valve in dynamic simulator system, improve dynamic analog
The simulation precision of plan system, it is ensured that voltage, electric current are consistent with Practical Project.
Brief description of the drawings
, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art
The required accompanying drawing used is briefly described in embodiment or description of the prior art, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of equivalent electric of the dynamic analog circuit of a bridge arm inductance in flexible direct current power network dynamic analog circuit
Lu Tu；
Fig. 2 is a kind of simplification topological diagram of flexible direct current power network dynamic analog circuit.
Embodiment
Technical scheme is clearly and completely described below in conjunction with accompanying drawing, it is clear that described implementation
Example is part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
As long as in addition, technical characteristic involved in invention described below different embodiments non-structure each other
It is be combined with each other into conflict can.
The present embodiment provides a kind of flexible direct current power network dynamic analog circuit, and the circuit includes multiple bridge arm inductance, wherein
The equivalent circuit diagram of one bridge arm inductance L dynamic analog circuit is as shown in Figure 1.Each bridge arm inductance L reversely goes here and there respectively
Join a controlled voltage source UVCVS, the controlled voltage of the controlled voltage source for the stray resistance r of the bridge arm inductance voltage
Ur, the equivalent resistance R of the controlled voltage sourcenIt is negative resistance for C-V characteristic, for reducing the stray electrical of the bridge arm inductance
Hinder r.
According to the definition of Circuit theory, the C-V characteristic of linear resistance is one and leads to zeroaxial straight line, straight line
Slope is the resistance of linear resistance.When straight line is located at I, III quadrant (first, third quadrant), resistance is just；At straight line
When II, IV quadrant (second, fourth quadrant), resistance is negative.The resistance that C-V characteristic is in II, IV quadrant is that C-V characteristic is
Negative resistance, i.e. negative resistance.Single negative resistance is not present in real world, but can be by using other electronics
The simulated behavior of element goes out the C-V characteristic of negative resistance, so as to produce equivalent negative resistance.Converter valve bridge arm inductance it is spuious
Resistance r is positive resistance, and equivalent negative resistance is connected with stray resistance r, by equivalent negative equivalent resistance into being one of stray resistance r
Point, so equivalent to the resistance for reducing stray resistance r.
Controlled source is generally divided into four kinds, is VCVS (Voltage Controlled Voltage respectively
Source；VCVS), current-controlled voltage source, VCCS and CCCS.As a preferable implementation
Mode, according to topological structure and demand, the present invention is using VCVS (VCVS) come as negative resistance.
As shown in figure 1, L is bridge arm inductance, r is the stray resistance of bridge arm inductance, RnFor VCVS type i.e. by
Control the negative resistance of voltage source.Assuming that the perunit value of the bridge arm inductance of converter valve is L, its stray resistance perunit value is r.In engineering
In calculation, often without the actual value of each physical quantity, but with actual value and the ratio of a certain selected base value of same units, i.e.,
Perunit value, to be calculated.That is, perunit value=actual value/base value.Perunit value is a relative value, without unit.In the present embodiment
The voltage of the controlled voltage source, the voltage of stray resistance of the bridge arm inductance, the equivalent resistance, described of the bridge arm inductance
The stray resistance of the stray resistance of bridge arm inductance, the equivalent resistance of the controlled voltage source and the Practical Project bridge arm inductance
It is perunit value.
It is controlled voltage source U that a VCVS is added on each bridge arm of converter valveVCVS, its controlled voltage
For stray resistance r voltage Ur, the voltage U of the controlled voltage sourceVCVSWith the voltage U of the stray resistance of the bridge arm inductancerIt is full
Sufficient formula (1), UrAnd ULPhysical relationship such as formula (3) shown in.
UVCVS=-xUr (1)
In formula (1), UVCVSFor the voltage perunit value of controlled voltage source；UrFor the voltage perunit of the stray resistance of bridge arm inductance
Value；X is proportionality coefficient, and span is 0~1；In formula (3), ULFor bridge arm inductance L voltage perunit value, wherein ω=2 π f, f
For power frequency.
Assuming that the electric current perunit value for flowing through bridge arm inductance is i, then shown in the voltage-current relationship of stray resistance such as formula (4).
Ur=ri (4)
Formula (4) is brought into formula (1), obtains formula (5).
UVCVS=-xri (5)
Assuming that the equivalent resistance perunit value of controlled voltage source is Rn, obtain formula (6).
Because x and r are positive number, so the VA characteristic curve of the controlled voltage source is in II, IV quadrant, it is possible thereby to
Controlled voltage source is equivalent into a negative resistance.
Due to stray resistance r and controlled voltage source UVCVSIn series relationship, so the equivalent resistance perunit of bridge arm inductance
Value rnewAs shown in formula (7).From formula (7), the equivalent resistance r of the bridge arm inductancenewFor the stray electrical of the bridge arm inductance
Hinder r and the controlled voltage source equivalent resistance RnSum.
rnew=r+Rn=(1-x) r (7)
Assuming that the perunit value of Practical Project bridge arm inductance stray resistance is rb, because dynamic analog platform bridge arm inductance
The perunit value r of stray resistance compares rbGreatly, then the mathematical relationship as shown in formula (8) be present.
R=rb+Δr (8)
In formula (8), Δ r is r and rbDifference.
Make rnew=rb, can obtain best proportion coefficient xbAs shown in formula (2).When the proportionality coefficient x values in formula (1) is most
Excellent proportionality coefficient xbWhen, it can obtain and the immediate dynamic analog precision of Practical Project.
Series connection one meets the voltage control electricity of formula (1) and (2) so at each bridge arm inductance of dynamic analog platform
Potential source is controlled voltage source, equivalent to a negative resistance of having been connected at each bridge arm inductance, just reduces the miscellaneous of bridge arm inductance
Resistance value is dissipated, that is, reduces the perunit value of bridge arm inductance stray resistance, makes the stray resistance of dynamic simulator system bridge arm inductance
Perunit value is equal to the stray resistance perunit value of Practical Project bridge arm inductance, so as to reduce dynamic simulator system bridge arm inductance
Loss, closer to Practical Project.
Flexible direct current power network dynamic analog circuit provided by the invention, including multiple bridge arm inductance, each bridge arm electricity
One controlled voltage source of differential concatenation, the controlled voltage of the controlled voltage source are the stray resistance of the bridge arm inductance respectively for sense
Voltage, the equivalent resistance of the controlled voltage source is that C-V characteristic is negative resistance, for reducing the miscellaneous of the bridge arm inductance
Dissipate resistance.In flexible direct current power network dynamic analog circuit, the voltage that is controlled by differential concatenation by bridge arm inductance stray resistance
Source, it is equivalent go out C-V characteristic be negative resistance, realize negative-resistance-compensated.The circuit can reduce the stray electrical of bridge arm inductance
Resistance, makes the stray resistance perunit value of dynamic analog circuit bridge arm inductance close to the stray resistance mark of Practical Project bridge arm inductance
One value, reduces the loss of bridge arm inductance, so as to reduce the loss of converter valve in dynamic simulator system, improves dynamic analog
The simulation precision of system, it is ensured that voltage, electric current are consistent with Practical Project.
As a specific embodiment, a kind of simplification topological diagram such as Fig. 2 of flexible direct current power network dynamic analog circuit
It is shown.The internal inductance of voltage source is Ls, the internal resistance of voltage source is rs, the actual output voltage of voltage source is Us, it is connected to
Y/ Δ type transformers, by electric capacity, resistance, inductor filter, access bridge arm inductance L.R is the stray resistance of bridge arm inductance, spuious
Resistance r voltage is Ur。RnIt is the negative resistance of controlled voltage source for equivalent VCVS type, the electricity of controlled voltage source
Press as UVCVS, MMC (Modular Multilevel Converter, modularization multi-level converter) is the dynamic analog of converter valve
Intend platform, UcFor MMC input voltage, the negative resistance R of MMC and controlled voltage sourcenIt is connected in series.
Series connection one meets the voltage control electricity of formula (1) and (2) so at each bridge arm inductance of dynamic analog platform
Potential source is controlled voltage source, equivalent to a negative resistance of having been connected at each bridge arm inductance, just reduces the miscellaneous of bridge arm inductance
Resistance value is dissipated, that is, reduces the perunit value of bridge arm inductance stray resistance, makes the stray resistance of dynamic simulator system bridge arm inductance
Perunit value is equal to the stray resistance perunit value of Practical Project bridge arm inductance, so as to reduce dynamic simulator system bridge arm inductance
Loss, closer to Practical Project.
The present invention is applied to flexible direct current power network dynamic analog platform, improves the simulation precision of dynamic analog platform, makes
The overall losses of dynamic analog platform are consistent with Practical Project.
Obviously, above-described embodiment is only intended to clearly illustrate example, and is not the restriction to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or
Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or
Among changing still in the protection domain of the invention.
Claims (5)
1. a kind of flexible direct current power network dynamic analog circuit, including multiple bridge arm inductance, it is characterised in that：
Each described bridge arm inductance difference one controlled voltage source of differential concatenation, the controlled voltage of the controlled voltage source is described
The voltage of the stray resistance of bridge arm inductance, the equivalent resistance of the controlled voltage source is that C-V characteristic is negative resistance, for subtracting
The stray resistance of the small bridge arm inductance.
2. circuit according to claim 1, it is characterised in that the voltage of the controlled voltage source and the bridge arm inductance
The voltage of stray resistance meets formula (1)：
UVCVS=-xUr (1)
In formula (1), UVCVSFor the voltage of the controlled voltage source；X is proportionality coefficient, and span is 0~1；UrFor the bridge arm
The voltage of the stray resistance of inductance.
3. circuit according to claim 2, it is characterised in that the equivalent resistance of the bridge arm inductance is the bridge arm inductance
Stray resistance and the controlled voltage source equivalent resistance and.
4. circuit according to claim 3, it is characterised in that best proportion coefficient xbAs shown in formula (2)：
<mrow>
<msub>
<mi>x</mi>
<mi>b</mi>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<mi>r</mi>
<mo>-</mo>
<msub>
<mi>r</mi>
<mi>b</mi>
</msub>
</mrow>
<mi>r</mi>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>2</mn>
<mo>)</mo>
</mrow>
</mrow>
In formula (2), r is the stray resistance of the bridge arm inductance；rbFor the stray resistance of Practical Project bridge arm inductance.
5. according to the circuit any one of claim 2-4, it is characterised in that the voltage of the controlled voltage source, described
The voltage of the stray resistance of bridge arm inductance, the equivalent resistance of the bridge arm inductance, the bridge arm inductance stray resistance, it is described by
It is perunit value to control the equivalent resistance of voltage source and the stray resistance of the Practical Project bridge arm inductance.
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| CN201710433221.1A CN107464482B (en) | 2017-06-09 | 2017-06-09 | Flexible direct current power grid dynamic analog circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710433221.1A CN107464482B (en) | 2017-06-09 | 2017-06-09 | Flexible direct current power grid dynamic analog circuit |
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| CN107464482B CN107464482B (en) | 2020-07-28 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060018628A (en) * | 2004-08-25 | 2006-03-02 | 김비오 | Electric circuit for experiment on ohm's law |
| CN203535149U (en) * | 2013-11-13 | 2014-04-09 | 国家电网公司 | Superconducting magnet simulation system |
| CN105045952A (en) * | 2015-05-29 | 2015-11-11 | 许继电气股份有限公司 | Multidimensional modeling method and simulation method for modular multilevel converter |
| CN106546852A (en) * | 2016-11-01 | 2017-03-29 | 全球能源互联网研究院 | A kind of MMC converter valves Tests at Steady State circuit and its control method |
-
2017
- 2017-06-09 CN CN201710433221.1A patent/CN107464482B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060018628A (en) * | 2004-08-25 | 2006-03-02 | 김비오 | Electric circuit for experiment on ohm's law |
| CN203535149U (en) * | 2013-11-13 | 2014-04-09 | 国家电网公司 | Superconducting magnet simulation system |
| CN105045952A (en) * | 2015-05-29 | 2015-11-11 | 许继电气股份有限公司 | Multidimensional modeling method and simulation method for modular multilevel converter |
| CN106546852A (en) * | 2016-11-01 | 2017-03-29 | 全球能源互联网研究院 | A kind of MMC converter valves Tests at Steady State circuit and its control method |
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