CN101984534B - Multi-functional dynamic reactive power compensation device for micro-power grid and control method thereof - Google Patents
Multi-functional dynamic reactive power compensation device for micro-power grid and control method thereof Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a multi-functional dynamic reactive power compensation device for a micro-power grid and a control method thereof, and the multi-functional dynamic reactive power compensation device comprises a voltage Hall installed at a connection point of the multi-functional dynamic reactive power compensation device for the micro-power grid and the micro-power grid, a current transformer for detecting current between the micro-power grid and a large power grid, a low-pass filter consisting of a resistor and a capacitor, the connection point of a load or an inversion device in the micro-power grid and the micro-power grid, and a first load arranged at the connection point; the current transformer is arranged between a control switch and the connection point; and a second load is arranged between the voltage Hall and the low-pass filter. The multi-functional dynamic reactive power compensation device has better compensation performance when the micro-power grid and the large power grid are in grid-connected operation by using the closed-loop control way of reactive power and specific-order harmonic current. The multi-functional dynamic reactive power compensation device for the micro-power grid and the control method thereof can better maintain the voltage at the access point stable when the micro-power grid operates alone.
Description
Technical field:
The invention belongs to the micro power network system field, relate to a kind of multi-functional dynamic reactive compensation device and control method thereof, especially a kind of micro power network is with multi-functional dynamic reactive compensation device and control method thereof.
Background technology:
Prior art mainly adopts open loop control, idle and harmonic component in the open-loop compensation system, namely only detect the load-side electric current and do not detect net survey electric current, the such error that detects of open loop and be not the reason of closed loop owing to system, make the actual compensation effect of power network current can not get direct guarantee, all these all can make system not reach best compensation effect.Particularly under the micro power network condition, if want to compensate harmonic wave and the idle component that microgrid produces, then the installation of dynamic reactive compensation device will be subject to larger restriction.
The open loop control mode of existing utilization reactive current and harmonic current, need to detect the input current of load, but sometimes at the scene under the condition, and when micro power network is incorporated into the power networks with large electrical network, can't detect load current, so can't compensate simultaneously preferably idle the and specific subharmonic current that micro power network system produces.When the micro power network isolated operation, the fluctuation of voltage is comparatively serious simultaneously.Simultaneously existing technology control mode is comparatively single, can't be applicable to better that micro power network is incorporated into the power networks and under two kinds of operational modes of net.
Summary of the invention:
The present invention has used the close-loop control mode of idle and specific subharmonic current, and preferably compensation performance is arranged when micro power network is incorporated into the power networks with large electrical network.The present invention can when the micro power network isolated operation, keep the access point voltage stabilization preferably.
The object of the invention is to overcome the shortcoming of above-mentioned prior art, provide a kind of micro power network multi-functional dynamic reactive compensation device, load or the tie point of inverter and micro power network, the first load of tie point place setting in the current transformer that be included in voltage Hall that micro power network installs with the tie point place of multi-functional dynamic reactive compensation device and micro power network, is used for the electric current between micro power network and the large electrical network is detected, the low pass filter that is formed by resistance and electric capacity, the micro power network; Described current transformer is arranged between control switch and the tie point; Be provided with the second load between described voltage Hall and the low pass filter.
Control method based on described multi-functional dynamic reactive compensation device comprises the steps:
(1) multi-functional dynamic reactive compensation device is set;
(2) operational mode of detection micro power network; When being incorporated into the power networks, large electrical network and micro power network turn step (3); When large electrical network and micro power network turn step (4) during from net;
(3) when large electrical network and micro power network are incorporated into the power networks, in accordance with the following steps:
(a) make Current Transformer and voltage Hall, the voltage at the electric current between micro power network and the large electrical network and compensation arrangement access micro power network place is detected;
(b) by signal conditioning circuit, the analog quantity that samples is converted to digital quantity, utilizes simultaneously the voltage that detects to carry out phase-locked;
(c) obtain fundamental phase by phase-locked loop after, utilize instantaneous reactive power theory to calculate the component of idle and harmonic current on d axle and q axle of large electrical network and micro power network junction;
(d) for the reactive current component, with I
sMultiply by after the first-harmonic transition matrix, can obtain d axle and q axle component, obtain d after the low-pass filtering
1And q
1Take zero as set-point, with q
1Subtract each other, can obtain the error signal on the q axle; After regulating, PI by the conversion inverse matrix of first-harmonic, can obtain the set-point of idle component; For specific order harmonic components, with I
sMultiply by after the specific subharmonic transition matrix, can obtain d axle and q axle component, obtain d after the low-pass filtering
kAnd q
kTake zero as set-point, respectively at d
kAnd q
kSubtract each other, can obtain the error signal on d axle and the q axle after PI regulates; And then multiply by the transition matrix of specific subharmonic, can obtain the set-point of specific order harmonic components;
(e) current-order is sent into DA, system the actual current feedback signal that produces subtract each other, through PI, can obtain error signal, then control the PWM inverter and produce corresponding electric current, above loop is then as the interior ring tracking loop of system;
(f) by the triangle wave loop, generate pwm signal;
(g) current and voltage signals of checkout gear is protected and logical process;
(h) the idle and inhibition harmonic current in the dynamic bucking-out system;
(4) when large electrical network and micro power network during from net, in accordance with the following steps:
(a) by the voltage Hall, detect the voltage at compensation arrangement access micro power network place
(b) by signal conditioning circuit, the analog quantity that samples is converted to digital quantity, utilizes simultaneously the voltage that detects to carry out phase-locked;
(c) utilize instantaneous reactive power theory, calculating voltage U is through the d axle component of first-harmonic transition matrix in real time;
(d) take given voltage magnitude as instruction, after subtracting each other with d axle component, obtain error signal, as the instruction of q axle, after the transition matrix inverse transformation by first-harmonic, can obtain the interior ring set-point of system behind the PI;
(e) current-order is sent into DA, system the actual current feedback signal that produces subtract each other, through PI, can obtain error signal, then control the PWM inverter and produce corresponding electric current, above loop is then as the interior ring tracking loop of system;
(f) by the triangle wave loop, generate pwm signal;
(g) current and voltage signals of checkout gear is protected and logical process;
(h) the idle and inhibition harmonic current in the dynamic bucking-out system.
The invention has the beneficial effects as follows: when the closed loop compensation reactive current, can be with the fundamental positive sequence reactive-current compensation extremely close to zero level, before compensation, in the electric current of system, 5 component of degree n ns are 22% with the ratio of fundamental current, the ratio of 7 component of degree n ns and fundamental current is 10.6%, the ratio of 11 component of degree n ns and fundamental current is 7.7%, after the compensation, 5 component of degree n ns are 1.1% with the ratio of fundamental current, the ratio of 7 component of degree n ns and fundamental current is that the ratio of 1.1%, 11 component of degree n n and fundamental current is 0.5%; When system voltage falls, can in one-period, voltage magnitude be retained to set-point again.
Description of drawings:
Fig. 1 is micro power network of the present invention with the control flow chart of multi-functional dynamic reactive compensating method;
Fig. 2 is the winding diagram of existing dynamic reactive compensation device in micro power network;
Fig. 3 is micro power network of the present invention with multi-functional dynamic reactive compensation device winding diagram.
Wherein: 1 is the voltage Hall; 2 is electric network impedance; 3 is tie point; 4 is inverter; 5 is large electrical network; 6 is current transformer; 7 is control switch; 8 is low pass filter; 9 is reactive power compensator; 10 is the first load; 11 is the second load.
Embodiment:
Below in conjunction with accompanying drawing the present invention is done and to describe in further detail:
Referring to Fig. 1-3, the multi-functional dynamic reactive compensation device of a kind of micro power network is characterized in that: load or the tie point of inverter and micro power network, the first load of tie point place setting in the current transformer that be included in voltage Hall that micro power network installs with the tie point place of multi-functional dynamic reactive compensation device and micro power network, is used for the electric current between micro power network and the large electrical network is detected, the low pass filter that is comprised of resistance and electric capacity, the micro power network; Described current transformer is arranged between control switch and the tie point; Be provided with the second load between described voltage Hall and the low pass filter.
The method is carried out as follows:
When large electrical network and micro power network are incorporated into the power networks:
(1) makes Current Transformer and voltage Hall, the voltage at the electric current between micro power network and the large electrical network and compensation arrangement access micro power network place is detected;
(2) by signal conditioning circuit, the analog quantity that samples is converted to digital quantity, utilizes simultaneously the voltage that detects to carry out phase-locked;
(3) obtain fundamental phase by phase-locked loop after, utilize instantaneous reactive power theory to calculate the component of idle and harmonic current on d axle and q axle of large electrical network and micro power network junction;
(4) for the reactive current component, with I
sMultiply by after the first-harmonic transition matrix, can obtain d axle and q axle component, obtain d after the low-pass filtering
1And q
1Take zero as set-point, with q
1Subtract each other, can obtain the error signal on the q axle.After regulating, PI by the conversion inverse matrix of first-harmonic, can obtain the set-point of idle component.For specific order harmonic components, with I
sMultiply by after the specific subharmonic transition matrix, can obtain d axle and q axle component, obtain d after the low-pass filtering
kAnd q
kTake zero as set-point, respectively at d
kAnd q
kSubtract each other, can obtain the error signal on d axle and the q axle after PI regulates.And then multiply by the transition matrix of specific subharmonic, can obtain the set-point of specific order harmonic components;
(5) current-order is sent into DA, system the actual current feedback signal that produces subtract each other, through PI, can obtain error signal, then control the PWM inverter and produce corresponding electric current, above loop is then as the interior ring tracking loop of system;
(6) by the triangle wave loop, generate pwm signal;
(7) current and voltage signals of checkout gear is protected and logical process;
(8) the idle and inhibition harmonic current in the dynamic bucking-out system.
When large electrical network and micro power network during from net:
(1) by the voltage Hall, detects the voltage at compensation arrangement access micro power network place
(2) by signal conditioning circuit, the analog quantity that samples is converted to digital quantity, utilizes simultaneously the voltage that detects to carry out phase-locked;
(3) utilize instantaneous reactive power theory, calculating voltage U is through the d axle component of first-harmonic transition matrix in real time;
(4) take given voltage magnitude as instruction, after subtracting each other with d axle component, obtain error signal, as the instruction of q axle, after the transition matrix inverse transformation by first-harmonic, can obtain the interior ring set-point of system behind the PI.
(5) current-order is sent into DA, system the actual current feedback signal that produces subtract each other, through PI, can obtain error signal, then control the PWM inverter and produce corresponding electric current, above loop is then as the interior ring tracking loop of system;
(6) by the triangle wave loop, generate pwm signal;
(7) current and voltage signals of checkout gear is protected and logical process;
(8) the idle and inhibition harmonic current in the dynamic bucking-out system.
The voltage Hall: micro power network is installed the voltage Hall with the tie point of multi-functional dynamic reactive compensation device and micro power network, is used for detecting voltage;
Electric network impedance: be used for simulating micro power network and micro power network with the electric network impedance between the multi-functional dynamic reactive compensation device;
Tie point: the tie point of load or inverter and micro power network in the micro power network;
Inverter: the inverter in the micro power network;
Current transformer: micro power network is with the part of multi-functional dynamic reactive compensation device, namely is used for current transformer that the electric current between micro power network and the large electrical network is detected.
Control switch: the control switch between micro power network and the large electrical network;
Low pass filter: micro power network is with the part of multi-functional dynamic reactive compensation device, the low pass filter that is comprised of resistance and electric capacity;
Reactive power compensator: the reactive power compensator that is used for reequiping;
The first load: the load in the micro power network;
The second load: the load in the micro power network, micro power network can during from net, keep its supply power voltage constant amplitude with large electrical network at micro power network with multi-functional dynamic reactive compensation device.
The present invention need to reequip common SVG dynamic reactive compensation device, to adapt to the closed loop compensation mode of this method.Need to add the low pass filter of electric capacity and resistance composition, need to after micro power network and repacking, add the voltage Hall in the tie point place of device, carrying out phase-locked and amplitude voltage calculates in real time, at tie point place adding current Hall or the current transformer of micro power network with large electrical network, sample rate current carries out the reactive current of closed loop and the compensation of specific subharmonic.
Wherein installing design parameter is: capacitance is 30 μ F, and resistance value is 0.5 Ω, and SVG (static reacance generator) design parameter is dc voltage 700V, Inductor 0.7mH.
Above content is in conjunction with concrete preferred implementation further description made for the present invention; can not assert that the specific embodiment of the present invention only limits to this; for the general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; can also make some simple deduction or replace, all should be considered as belonging to the present invention and determine scope of patent protection by claims of submitting to.
Claims (1)
1. multi-functional dynamic reactive compensation device of micro power network is characterized in that: comprise the SVG dynamic reactive compensation device, at voltage Hall that micro power network is installed with the tie point place of multi-functional dynamic reactive compensation device and micro power network, the current transformer that is used for the electric current between micro power network and the large electrical network is detected, formed by resistance and electric capacity and be installed in low pass filter between SVG dynamic reactive compensation device and the voltage Hall;
Micro power network is installed in the tie point place with multi-functional dynamic reactive compensation device, and described tie point is the tie point of load or inverter and micro power network in the micro power network, and the tie point place is provided with the first load;
Described current transformer is arranged between control switch and the tie point, and described control switch is arranged between micro power network and the large electrical network; Be provided with the second load between described voltage Hall and the low pass filter;
Being controlled to be of described multi-functional dynamic reactive compensation device:
(1) multi-functional dynamic reactive compensation device is set;
(2) operational mode of detection micro power network; When being incorporated into the power networks, large electrical network and micro power network turn step (3); When large electrical network and micro power network turn step (4) during from net;
(3) when large electrical network and micro power network are incorporated into the power networks, in accordance with the following steps:
(a) make Current Transformer and voltage Hall, electric current and micro power network between micro power network and the large electrical network are detected with the voltage that multi-functional dynamic reactive compensation device accesses the micro power network place;
(b) by signal conditioning circuit, the analog quantity that samples is converted to digital quantity, utilizes simultaneously the voltage that detects to carry out phase-locked;
(c) obtain fundamental phase by phase-locked loop after, utilize instantaneous reactive power theory to calculate the component of idle and harmonic current on d axle and q axle of large electrical network and micro power network junction;
(d) for the reactive current component, with I
sMultiply by after the first-harmonic transition matrix, can obtain d axle and q axle component, obtain respectively d after the low-pass filtering
1And q
1Take zero as set-point, with q
1Subtract each other, can obtain the error signal on the q axle; After regulating, PI by the conversion inverse matrix of first-harmonic, can obtain the set-point of idle component; For specific order harmonic components, with I
sMultiply by after the specific subharmonic transition matrix, can obtain d axle and q axle component, obtain d after the low-pass filtering
kAnd q
kTake zero as set-point, respectively with d
kAnd q
kSubtract each other, can obtain the error signal on d axle and the q axle after PI regulates; And then multiply by the conversion inverse matrix of specific subharmonic, can obtain the set-point of specific order harmonic components;
(e) current-order is sent into DA, with micro power network with multi-functional dynamic reactive compensation device the actual current feedback signal that produces subtract each other, through PI, can obtain error signal, then control the PWM inverter and produce corresponding electric current, above loop is then as the interior ring tracking loop of micro power network with multi-functional dynamic reactive compensation device;
(f) by the triangle wave loop, generate pwm signal;
(g) detect micro power network with the current and voltage signals of multi-functional dynamic reactive compensation device, protect and logical process;
(h) the idle and inhibition harmonic current in the dynamic bucking-out system;
Wherein:
I
s: the electric current of micro power network and large electrical network junction;
The d axle: three phase coordinate systems are converted to d, the d axle behind the q coordinate system;
The q axle: three phase coordinate systems are converted to d, the q axle behind the q coordinate system;
d
k: the d axle component after specific subharmonic current is changed through specific transition matrix;
q
k: the q axle component after specific subharmonic current is changed through specific transition matrix;
d
1: the d axle component after electric current is changed through the first-harmonic transition matrix;
q
1: the q axle component after electric current is changed through the first-harmonic transition matrix;
DA: digital-to-analogue conversion equipment is converted to analog signal with digital signal;
The PI:PI adjuster;
PWM: pulse width modulating technology;
U: voltage Hall sampling place voltage;
(4) when large electrical network and micro power network during from net, in accordance with the following steps:
(a) by the voltage Hall, detect micro power network accesses the micro power network place with multi-functional dynamic reactive compensation device voltage;
(b) by signal conditioning circuit, the analog quantity that samples is converted to digital quantity, utilizes simultaneously the voltage that detects to carry out phase-locked;
(c) utilize instantaneous reactive power theory, calculating voltage U is through the d axle component of first-harmonic transition matrix in real time;
(d) take given voltage magnitude as instruction, after subtracting each other with d axle component, obtain error signal, as the instruction of q axle, after the transition matrix inverse transformation by first-harmonic, can obtain micro power network with the interior ring set-point of multi-functional dynamic reactive compensation device behind the PI;
(e) current-order is sent into DA, with micro power network with multi-functional dynamic reactive compensation device the actual current feedback signal that produces subtract each other, through PI, can obtain error signal, then control the PWM inverter and produce corresponding electric current, above loop is then as the interior ring tracking loop of system;
(f) by the triangle wave loop, generate pwm signal;
(g) detect micro power network with the current and voltage signals of multi-functional dynamic reactive compensation device, protect and logical process;
(h) the idle and inhibition harmonic current in the dynamic bucking-out system.
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| CN102299520B (en) * | 2011-09-02 | 2013-08-14 | 北京四方华能电气设备有限公司 | Reactive power compensation method and system for micro power grid |
| CN104181374B (en) * | 2014-08-08 | 2017-02-15 | 合肥工业大学 | Method for detecting and separating positive and negative sequence components of grid voltage of three-phase neutral-line-free system |
| CN113964848B (en) * | 2021-12-20 | 2022-05-31 | 昆山帝森华途工业物联网科技有限公司 | Reactive current extraction module of APF control system |
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| JPH07312828A (en) * | 1994-05-17 | 1995-11-28 | Shinko Electric Co Ltd | Voltage control device |
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| CN2891473Y (en) * | 2006-03-25 | 2007-04-18 | 合肥工业大学 | Photoelectric current transformer with offline/online, charging control and power regulation functions |
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| EP2164147A2 (en) * | 2008-09-15 | 2010-03-17 | General Electric Company | Reactive power compensation in solar power system |
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Effective date of registration: 20150410 Address after: 225127 Jiangsu city of Yangzhou Province - high tech Industrial Development Zone, Road No. 10 Patentee after: YANGZHOU HUADING ELECTRIC Co.,Ltd. Address before: 710049 Xianning West Road, Shaanxi, China, No. 28, No. Patentee before: Xi'an Jiaotong University |
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Denomination of invention: A multifunctional dynamic reactive power compensation device for microgrid and its control method Effective date of registration: 20200907 Granted publication date: 20130206 Pledgee: Bank of China Limited Yangzhou Development Zone Branch Pledgor: YANGZHOU HUADING ELECTRIC Co.,Ltd. Registration number: Y2020980005772 |
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Date of cancellation: 20221020 Granted publication date: 20130206 Pledgee: Bank of China Limited Yangzhou Development Zone Branch Pledgor: YANGZHOU HUADING ELECTRIC Co.,Ltd. Registration number: Y2020980005772 |
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