CN104852616A - Power grid simulator with line impedance simulation function, and control method - Google Patents

Power grid simulator with line impedance simulation function, and control method Download PDF

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Publication number
CN104852616A
CN104852616A CN201510270499.2A CN201510270499A CN104852616A CN 104852616 A CN104852616 A CN 104852616A CN 201510270499 A CN201510270499 A CN 201510270499A CN 104852616 A CN104852616 A CN 104852616A
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China
Prior art keywords
phase
line impedance
signal generation
control signal
filter
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Pending
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CN201510270499.2A
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Chinese (zh)
Inventor
张兴
朱虹
李飞
余畅舟
刘芳
毛福斌
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Hefei University of Technology
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Hefei University of Technology
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Priority to CN201510270499.2A priority Critical patent/CN104852616A/en
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Abstract

The invention provides a power grid simulator with a line impedance simulation function, and a control method. The power grid simulator with a line impedance simulation function comprises a DC power supply, a three-level PWM inverter, a filter, a load, and a control circuit. The control circuit comprises a three-phase current detection device, a three-phase line impedance voltage drop calculation module, a three-phase ideal voltage source, three summators, and a PWM control signal generation module. The control method comprises the following steps: detecting output current of the filter; the calculation module calculating three-phase line impedance voltage drop needed to simulate; calculating voltage command signals of the PWM control signal generation module, and generating a drive signal of a power switching tube in the three-level PWM inverter through the PWM control signal generation module. The simulator can simulate ideal voltage sources in a power grid, and has a line impedance simulation function, thereby making up defects of functions of existing power grid simulators, and enhancing functions of the power grid simulators.

Description

With electrical network simulator and the control method of line impedance analog functuion
Technical field
The invention belongs to power quality analysis and control field, relate to a kind of electrical network simulator with line impedance analog functuion and control method, in distributed power generation research, for system provides the generating means of real power grid environment.
Background technology
The voltage that electrical network provides is the standard sine voltage of low harmony wave, and electric network fault has contingency and uncontrollability, when research and the system testing of distributed power generation, cannot simulate various malfunction by means of only electrical network itself.Therefore, the failure condition being carried out simulating grid by some special equipment is needed.
At present, the research of electrical network simulator has become the hot issue of distributed power generation research, as utility model patent document " a kind of electrical network simulator " (publication number CN202818122U) and " a kind of full energy feedback type electrical network simulator " (publication number CN 203911496U), wherein:
Chinese utility model patent specification CN202818122U " a kind of electrical network simulator " disclosed in the 20 days March in 2013, this electrical network simulator can export three-phase Independent adjustable, has harmonic wave, can do the AC power of low voltage crossing experiment;
Chinese utility model patent specification CN203911496U is " a kind of full energy feedback type electrical network simulator " disclosed in the 29 days October in 2014, this utility model can realize line voltage gradual change, no-voltage is passed through, gradual frequency change, mistake (owing) are pressed, cross the simulation of the functions such as (owing) frequency, can meet the various electric performance test of photovoltaic DC-to-AC converter and electric network fault simulation.
Making a general survey of existing relevant electrical network simulator granted patent, comprise line impedance analog functuion without any electrical network simulator, is only simulate from the angle of ideal source electrical network, and its technical problem existed is as follows:
1, actual electrical network is not ideal source, and the electrical network simulator without line impedance analog functuion cannot reflect the actual conditions of system truly;
2, usually have certain transmission line between electrical network and load, the electrical network simulator without line impedance analog functuion cannot embody the impact of line impedance on electrical network.
Summary of the invention
A kind of electrical network simulator with line impedance analog functuion that the present invention proposes and control method, can according to the line impedance of actual required simulation, the function of line impedance simulation is realized by the mode of load current being carried out to feedback regulation, compensate for existing electrical network simulator deficiency functionally, there is novelty and actual application value.
The object of the present invention is achieved like this.
The invention provides a kind of electrical network simulator with line impedance analog functuion, comprise DC power supply, three-level pwm inverter, filter, load and control circuit; Described control circuit comprises: three-phase current detection device, three-phase line impedance drop computing module, three-phase ideal voltage source, three adders and pwm control signal generation module;
Described DC power output end is connected with described three-level pwm inverter input terminal;
Described three-level pwm inverter three-phase output end is connected with described filter three-phase input end one_to_one corresponding, and described filter three-phase output end is connected with load, respectively output voltage u a, u band u c, output current i a, i band i c;
The three-phase input end of described three-phase current detection device is connected with described filter three-phase output end one_to_one corresponding respectively, and the three-phase output end of three-phase current detection device is connected with the three-phase input end one_to_one corresponding of described three-phase line impedance drop computing module;
Be in parallel between described three adders, each adder first input end connects the corresponding phase of described three-phase ideal voltage source, the corresponding phase output terminal of three-phase line impedance drop computing module described in second input termination, exports the corresponding phase input of pwm control signal generation module described in termination;
In three-level pwm inverter described in the output termination of described pwm control signal generation module, the control end correspondence of power switch pipe is connected.
Present invention also offers a kind of control method of the electrical network simulator with line impedance analog functuion, comprise the following steps:
Step 1, with three-phase current detection device Fault detection filter, obtains filter to output current i a, i band i c;
Step 2, calculates the three-phase line impedance drop Δ u of required simulation with three-phase line impedance drop computing module a, Δ u b, Δ u c, that is:
Δu a＝i a*Z a
Δu b＝i b*Z b
Δu c＝i c*Z c
Wherein, Z a, Z band Z cfor the three-phase line impedance of required simulation, Z a, Z band Z cnumerical value be set point;
Step 3, the three-phase line impedance drop Δ u utilizing step 2 to obtain a, Δ u b, Δ u ccalculate the voltage command signal U of pwm control signal generation module a *, U b *, U c *,
U a *＝U a-Δu a；
U b *＝U b-Δu b；
U c *＝U c-Δu c；
Wherein, U a, U b, U cbe respectively three-phase ideal voltage source voltage, its numerical value is obtained by setting.
Step 4, the voltage command signal U that step 3 is obtained a *, U b *, U c *go out the drive singal of power switch pipe in three-level pwm inverter through pwm control signal generation CMOS macro cell, and by the output of pwm control signal generation module, the power switch pipe in three-level pwm inverter is controlled.
Relative to prior art, the invention has the beneficial effects as follows:
1, electrical network equivalence is become ideal source series impedance model, improve the accuracy of electrical network simulation;
2, can the electrical network of analog band line impedance, be convenient to research line impedance to the impact of system.
Accompanying drawing explanation
Fig. 1 is a kind of electrical network simulator structure figure with line impedance analog functuion of the present invention.
Fig. 2 is structure chart when electrical network simulator connects actual track impedance in specific embodiment.
Fig. 3 is electrical network simulator analog line impedance output voltage waveform in specific embodiment.
Fig. 4 is that in specific embodiment, electrical network simulator connects actual track impedance output voltage waveform.
Embodiment
Utilize MATLAB/Simulink emulation platform building system model, provide a kind of electrical network simulator with line impedance analog functuion, specifically as shown in Figure 1.
As seen from Figure 1, the present invention includes DC power supply, three-level pwm inverter, filter, load and control circuit.Wherein control circuit comprises: three-phase current detection device, three-phase line impedance drop computing module, three-phase ideal voltage source, three adders and pwm control signal generation module.
The connection of concrete various piece is as follows:
Described DC power output end is connected with described three-level pwm inverter input terminal;
Described three-level pwm inverter three-phase output end is connected with described filter three-phase input end one_to_one corresponding, and described filter three-phase output end is connected with load, respectively output voltage u a, u band u c, output current i a, i band i c;
The three-phase input end of described three-phase current detection device is connected with described filter three-phase output end one_to_one corresponding, and three-phase output end is connected with the three-phase input end one_to_one corresponding of described three-phase line impedance drop computing module;
Be in parallel between described three adders, each adder first input end connects the corresponding phase of described three-phase ideal voltage source, the corresponding phase output terminal of three-phase line impedance drop computing module described in second input termination, exports the corresponding phase input of pwm control signal generation module described in termination;
In three-level pwm inverter described in the output termination of described pwm control signal generation module, the control end correspondence of power switch pipe is connected.
In an embodiment, the relevant parameter of system is as follows:
Direct current power source voltage U dc=400V;
Three-level pwm inverter power grade P=125Kw, switching frequency f δ W=8KHz;
Filter adopts LC filter, design parameter filter inductance 0.12e-3H, filter capacitor 30e-6F; Three-phase ideal voltage source is respectively:
U a＝81.6497sin(100πt)，
U b = 81.6497 sin ( 100 πt - 2 3 π ) ,
U c = 81.6497 sin ( 100 πt + 2 3 π ) ;
Wherein, t is the time, is set point.
The load of three-phase electricity resistance type is selected in load, and resistance is 0.5 ohm.
In addition, the present invention also provides a kind of control method of the electrical network simulator with line impedance analog functuion, comprises the following steps:
Step 1, with three-phase current detection device Fault detection filter, obtains filter to output current i a, i band i c;
Step 2, calculates the three-phase line impedance drop Δ u of required simulation with three-phase line impedance drop computing module a, Δ u b, Δ u c, that is:
Δu a＝i a*Z a
Δu b＝i b*Z b
Δu c＝i c*Z c
Wherein, Z a, Z band Z cfor the three-phase line impedance of required simulation, Z a, Z band Z cnumerical value be set point.In this specific embodiment, the line impedance of the required simulation of three-phase is respectively: A phase resistance R=0.01 Ω, B phase inductance L=1e-5H, C phase electric capacity C=1e-2F, and the line impedance namely arranging three-phase is respectively:
Z a＝0.01Ω
Z b＝ωL＝2*π*50*1e-5＝0.0031Ω
Z c = 1 ωC = 1 2 * π * 50 * 1 e - 2 = 0.3183 Ω ,
Step 3, the three-phase line impedance drop Δ u utilizing step 2 to obtain a, Δ u b, Δ u ccalculate the voltage command signal U of pwm control signal generation module a *, U b *, U c *,
U a *＝U a-Δu a；
U b *＝U b-Δu b；
U c *＝U c-Δu c；
Wherein, U a, U b, U cbe respectively three-phase ideal voltage source voltage, its numerical value is obtained by setting.In the present embodiment:
U a＝81.6497sin(100πt)
U b = 81.6497 sin ( 100 πt - 2 3 π )
U c = 81.6497 sin ( 100 πt + 2 3 π )
Step 4, the voltage command signal U that step 3 is obtained a *, U b *, U c *go out the drive singal of power switch pipe in three-level pwm inverter through pwm control signal generation CMOS macro cell, and by the output of pwm control signal generation module, the power switch pipe in three-level pwm inverter is controlled.
Fig. 3 is the present embodiment output voltage u a, u band u coscillogram.
Meanwhile, in order to verify the validity of line impedance analog functuion in the present invention, embodiment also simulates the situation that system connects actual track impedance, and concrete structure is see Fig. 2.
The relevant parameter of system is as follows:
Direct current power source voltage U dc=400V;
Three-level pwm inverter power grade P=125Kw, switching frequency f δ W=8KHz;
Filter adopts three-phase LC filter, design parameter filter inductance 0.12e-3H, filter capacitor 30e-6F;
Three-phase ideal voltage source is respectively:
U a＝81.6497sin(100πt)
U b = 81.6497 sin ( 100 πt - 2 3 π )
U c = 81.6497 sin ( 100 πt + 2 3 π )
Wherein, t is the time, is set point.
The load of three-phase electricity resistance type is selected in load, and resistance is 0.5 ohm.
As shown in Figure 2, DC power output end is connected with three-level pwm inverter input terminal; Three-level pwm inverter three-phase output end is connected with filter three-phase input end one_to_one corresponding, and filter three-phase output end connects different practical impedance respectively, and wherein A phase connecting resistance R, B connect inductance L, and C connects electric capacity C, and computing formula is as follows:
R＝0.01Ω，
L＝1e-5H，
C=1e-2F, such output voltage u a', u b' and u c';
Fig. 4 is output voltage u a', u b' and u c' oscillogram.
By Fig. 3 and Fig. 4, the output voltage values that when tabulation 1 is time 0.315s, described control method obtains with connect the output voltage values that actual track impedance obtains:
List 1
Be clear that very much by form 1, compared with connecing actual line impedance with system, adopt the magnitude of voltage approximately equal that the electrical network simulator of control method of the present invention exports, error is within 1%, illustrating that described a kind of electrical network simulator with line impedance analog functuion and control method thereof can realize the simulation of line impedance, is effective and feasible.

Claims (2)

1., with an electrical network simulator for line impedance analog functuion, comprise DC power supply, three-level pwm inverter, filter, load and control circuit, it is characterized in that:
Described control circuit comprises three-phase current detection device, three-phase line impedance drop computing module, three-phase ideal voltage source, three adders and pwm control signal generation module;
Described DC power output end is connected with described three-level pwm inverter input terminal;
Described three-level pwm inverter three-phase output end is connected with described filter three-phase input end one_to_one corresponding, and described filter three-phase output end is connected with load, respectively output voltage u a, u band u c, output current i a, i band i c;
The three-phase input end of described three-phase current detection device is connected with described filter three-phase output end one_to_one corresponding respectively, and the three-phase output end of three-phase current detection device is connected with the three-phase input end one_to_one corresponding of described three-phase line impedance drop computing module;
Be in parallel between described three adders, each adder first input end connects the corresponding phase of described three-phase ideal voltage source, the corresponding phase output terminal of three-phase line impedance drop computing module described in second input termination, exports the corresponding phase input of pwm control signal generation module described in termination;
The output of described pwm control signal generation module is corresponding with the control end of power switch pipe in described three-level pwm inverter to be connected.
2. a kind of control method of the electrical network simulator with line impedance analog functuion according to claims 1, is characterized in that comprising the following steps:
Step 1, with three-phase current detection device Fault detection filter, obtains filter to output current i a, i band i c;
Step 2, calculates the three-phase line impedance drop Δ u of required simulation with three-phase line impedance drop computing module a, Δ u b, Δ u c, that is:
Δu a＝i a*Z a
Δu b＝i b*Z b
Δu c＝i c*Z c
Wherein, Z a, Z band Z cfor the three-phase line impedance of required simulation, Z a, Z band Z cnumerical value be set point;
Step 3, the three-phase line impedance drop Δ u utilizing step 2 to obtain a, Δ u b, Δ u ccalculate the voltage command signal U of pwm control signal generation module a *, U b *, U c *,
U a *＝U a-Δu a；
U b *＝U b-Δu b；
u c *＝U c-Δu c；
Wherein, U a,u b, U cbe respectively three-phase ideal voltage source voltage, its numerical value is set point;
Step 4, the voltage command signal U that step 3 is obtained a *, U b *, U c *go out the drive singal of power switch pipe in three-level pwm inverter through pwm control signal generation CMOS macro cell, and by the output of pwm control signal generation module, the power switch pipe in three-level pwm inverter is controlled.
CN201510270499.2A 2015-05-25 2015-05-25 Power grid simulator with line impedance simulation function, and control method Pending CN104852616A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106487240A (en) * 2015-08-28 2017-03-08 中国电力科学研究院 A kind of grid simulator with accurate harmonic voltage and virtual impedance control
CN109787280A (en) * 2019-01-17 2019-05-21 合肥工业大学 Inverter system line impedance analogy method based on starting impedance angle
AT520835A4 (en) * 2018-01-18 2019-08-15 Ait Austrian Inst Tech Gmbh network simulator
CN111342480A (en) * 2020-03-13 2020-06-26 中国科学院电工研究所 Three-phase line mutual feedback power balance control method
WO2021089830A1 (en) 2019-11-08 2021-05-14 Rheinisch-Westfälische Technische Hochschule (Rwth) Aachen Apparatus for emulating a supply network for validating components of a power supply system

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JP2011120325A (en) * 2009-12-01 2011-06-16 Mitsubishi Electric Corp Power converter
CN102510120A (en) * 2011-11-23 2012-06-20 中国科学院电工研究所 Micro-grid inverter voltage and current double-ring hanging control method based on virtual impedance
CN102593858A (en) * 2011-01-15 2012-07-18 康弗蒂姆技术有限公司 Method for controlling operation of static energy supply units and controllers for static energy supply units
CN104330979A (en) * 2014-10-31 2015-02-04 国家电网公司 Analog simulation system of complex power distribution network

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011120325A (en) * 2009-12-01 2011-06-16 Mitsubishi Electric Corp Power converter
CN102593858A (en) * 2011-01-15 2012-07-18 康弗蒂姆技术有限公司 Method for controlling operation of static energy supply units and controllers for static energy supply units
CN102510120A (en) * 2011-11-23 2012-06-20 中国科学院电工研究所 Micro-grid inverter voltage and current double-ring hanging control method based on virtual impedance
CN104330979A (en) * 2014-10-31 2015-02-04 国家电网公司 Analog simulation system of complex power distribution network

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106487240A (en) * 2015-08-28 2017-03-08 中国电力科学研究院 A kind of grid simulator with accurate harmonic voltage and virtual impedance control
CN106487240B (en) * 2015-08-28 2019-02-05 中国电力科学研究院 A kind of grid simulator controlled with accurate harmonic voltage and virtual impedance
AT520835A4 (en) * 2018-01-18 2019-08-15 Ait Austrian Inst Tech Gmbh network simulator
AT520835B1 (en) * 2018-01-18 2019-08-15 Ait Austrian Inst Tech Gmbh network simulator
CN109787280A (en) * 2019-01-17 2019-05-21 合肥工业大学 Inverter system line impedance analogy method based on starting impedance angle
WO2021089830A1 (en) 2019-11-08 2021-05-14 Rheinisch-Westfälische Technische Hochschule (Rwth) Aachen Apparatus for emulating a supply network for validating components of a power supply system
CN111342480A (en) * 2020-03-13 2020-06-26 中国科学院电工研究所 Three-phase line mutual feedback power balance control method

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