CN103326548A - Method and system for capacitor voltage control of unified power quality controller - Google Patents
Method and system for capacitor voltage control of unified power quality controller Download PDFInfo
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- CN103326548A CN103326548A CN2013102581921A CN201310258192A CN103326548A CN 103326548 A CN103326548 A CN 103326548A CN 2013102581921 A CN2013102581921 A CN 2013102581921A CN 201310258192 A CN201310258192 A CN 201310258192A CN 103326548 A CN103326548 A CN 103326548A
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Abstract
The invention provides a method for capacitor voltage control of a unified power quality controller. The method comprises the following steps that current capacitor voltage instantaneous values of sub modules of the unified power quality controller are obtained; a voltage adjustment amount is obtained according to a preset capacitor voltage reference value and the capacitor voltage instantaneous values; according to the voltage adjustment amount, voltage stability control signals are generated; the voltage stability control signals are overlapped on sinusoidal modulation waves input into the sub modules so that adjusted capacitor voltage control signals can be obtained. Correspondingly, the invention further provides a system for capacitor voltage control of the unified power quality controller. According to the method and system for capacitor voltage control of the unified power quality controller, the actual difference of the capacitor voltage values of the sub modules is reduced and the sub modules can be controlled to output the same capacitor voltage.
Description
Technical field
The present invention relates to Unified Power Quality Controller, particularly relate to a kind of capacitance voltage control method of Unified Power Quality Controller, and a kind of capacitance voltage control system of Unified Power Quality Controller.
Background technology
Traditional with modularization multi-level converter (Modular Multilevel Converter, MMC) be Unified Power Quality Controller (the Unified Power Quality Conditioner of agent structure, UPQC), its main topological structure is a kind of many level topological structure, generally consisted of by six brachium pontis, submodule (the Sub-module that wherein each brachium pontis is interconnected by several and structure is identical, SM) formation of connecting with a reactor L, two brachium pontis consist of a facies unit up and down.For the purpose of modularized design and manufacturing, six brachium pontis have symmetry, and namely the parameter of each submodule all is identical with each brachium pontis reactance value.Significantly different from VSC topological structure in the past is that modularization multi-level converter does not have dc energy storage electric capacity between the DC side both positive and negative polarity.
This kind MMC topological structure has following technical advantage: 1) loss significantly reduces; 2) switch stress and switch subharmonic reduce; 3) modularized design of employing normal component; 4) can adapt to three-phase unbalance system.
Galvanic current holds the prerequisite that voltage is the MMC normal operation, the control of dc capacitor voltage is divided into two stages, first stage refers to the establishment stage of capacitance voltage, the target of this stage control is by this control strategy all dc capacitors in the MMC to be charged near the required capacitance voltage reference value of normal operation successively, realizes the MMC soft start.Second stage refers to the control stage of MMC when normal operation capacitance voltage, and the target of this stage control is to realize that by the voltage stabilizing control strategy dc capacitor voltage is stabilized near the capacitance voltage reference value, reduces the error between actual value and the reference value.Traditional voltage stabilizing control strategy is to the identical sinusoidal modulation wave of each submodule input, and is identical with the dc capacitor voltage that guarantees each submodule; Although each submodule all is made of the device of same structure, in fact may there be slight error between each device, therefore to the identical sinusoidal modulation wave of each submodule input, can't guarantee to control the identical capacitance voltage of each submodule output.
Summary of the invention
Based on this, the invention provides a kind of capacitance voltage control method and system of Unified Power Quality Controller, can reduce the difference of the capacitance voltage value of each submodule reality, control the identical capacitance voltage of each submodule output.
A kind of capacitance voltage control method of Unified Power Quality Controller comprises the steps:
Obtain the current capacitance voltage instantaneous value of submodule in the Unified Power Quality Controller;
Capacitance voltage reference value and described capacitance voltage instantaneous value according to default obtain the voltage adjustment amount;
According to described voltage adjustment amount, generate the voltage stabilizing control signal;
Described voltage stabilizing control signal is added to inputs on the sinusoidal modulation wave of described submodule the capacitance voltage control signal after being adjusted.
A kind of capacitance voltage control system of Unified Power Quality Controller comprises:
Acquisition module is used for obtaining the current capacitance voltage instantaneous value of Unified Power Quality Controller submodule;
Voltage adjustment amount module is used for obtaining the voltage adjustment amount according to default capacitance voltage reference value and described capacitance voltage instantaneous value;
The signal generation module is used for according to described voltage adjustment amount, generates the voltage stabilizing control signal;
Laminating module inputs to the sinusoidal modulation wave of described submodule, the capacitance voltage control signal after being adjusted for described voltage stabilizing control signal is added to.
Capacitance voltage control method and the system of above-mentioned Unified Power Quality Controller, get access to the current capacitance voltage instantaneous value of submodule in the Unified Power Quality Controller, according to default capacitance voltage reference value and described capacitance voltage instantaneous value, obtain the voltage adjustment amount again; According to this voltage adjustment amount, then can generate the voltage stabilizing control signal; At last described voltage stabilizing control signal is added to and inputs on the sinusoidal modulation wave of described submodule the capacitance voltage control signal after being adjusted; The service time of each submodule of capacitance voltage control signal capable of regulating after adjusting according to this, thus the difference of each submodule and actual capacitance voltage value reduced, control the identical capacitance voltage of each submodule output.
Description of drawings
Fig. 1 is the DC capacitor voltage control method schematic flow sheet in one embodiment of Unified Power Quality Controller of the present invention.
Fig. 2 is the DC capacitor voltage control system structural representation in one embodiment of Unified Power Quality Controller of the present invention.
Fig. 3 is the DC capacitor voltage control system structural representation in another embodiment of Unified Power Quality Controller of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described in further detail, but embodiments of the present invention are not limited to this.
As shown in Figure 1, be the capacitance voltage control method schematic flow sheet in one embodiment of a kind of Unified Power Quality Controller of the present invention, comprise the steps:
S11, obtain the current capacitance voltage instantaneous value of submodule in the Unified Power Quality Controller;
S12, default capacitance voltage reference value and the described capacitance voltage instantaneous value of basis obtain the voltage adjustment amount;
S13, according to described voltage adjustment amount, generate the voltage stabilizing control signal;
S14, described voltage stabilizing control signal is added to inputs on the sinusoidal modulation wave of described submodule the capacitance voltage control signal after being adjusted;
General upper and lower half brachium pontis of Unified Power Quality Controller n the submodule of all connecting.Establishment stage at capacitance voltage, at first the output of auxiliary direct current potential source is accordingly just being received MMC, on the negative dc bus, include two identical IGBT(Insulated Gate Bipolar Transistor in each submodule, insulated gate bipolar transistor), keep the IGBT T1 in 2n the submodule to be always off state, IGBT T2 in the submodule to be charged also is off state, IGBT T2 in all the other (2n-1) individual submodules is opening state, direct voltage source is just only to the capacitor charging of this submodule to be charged like this, when this submodule electric capacity to be filled reaches working voltage by the time, its charging is complete, IGBT T2 on it is become opening state by original off state, meanwhile, IGBT T2 in the next one submodule to be charged is become off state by original opening state, direct voltage source just can turn to this submodule charging like this, by that analogy, just can realize the successively charging to 2n submodule in the phase brachium pontis.Complete to final charging, can direct voltage source be disconnected by diode or the mechanical switch of series connection.
The capacitance energy storage instantaneous value is determined jointly by the capacitance of dc capacitor and the instantaneous value of this moment capacitance voltage, after electric capacity is selected, there is one to one relation between capacitance energy storage and the capacitance voltage, thereby, can realize by the increase and decrease of control capacitance energy storage raising or reduce the target of capacitance voltage.
When capacitance voltage need to boost, can be by the charging interval that increases electric capacity in each cycle and the energy storage that increases gradually electric capacity discharge time that reduces electric capacity; In like manner, when capacitance voltage needs step-down, can be by the charging interval that reduces electric capacity in each cycle and the energy storage that reduces gradually electric capacity discharge time that increases electric capacity; Therefore, the control of the capacitance voltage of Unified Power Quality Controller can approach default capacitance voltage reference value fast and accurately by each capacitance voltage of relatively realizing of each submodule capacitance voltage instantaneous value and capacitance voltage reference value; Get access to the current capacitance voltage instantaneous value of submodule the Unified Power Quality Controller from step S11 in the present embodiment; According to default capacitance voltage reference value and described capacitance voltage instantaneous value, obtain the voltage adjustment amount again; According to this voltage adjustment amount, then can generate the voltage stabilizing control signal; At last described voltage stabilizing control signal is added to and inputs on the sinusoidal modulation wave of described submodule the capacitance voltage control signal after being adjusted; Adjust the service time of electric capacity in the submodule according to the capacitance voltage control signal after this adjustment, thereby reduce the difference of the capacitance voltage value of each submodule and reality, control the identical capacitance voltage of each submodule output.
In a preferred embodiment, capacitance voltage reference value and described capacitance voltage instantaneous value that described basis is default, the step that obtains the voltage adjustment amount is:
Detect the current alternating current instantaneous value of described submodule;
If described alternating current instantaneous value is in positive half period, then default capacitance voltage reference value and the difference of described capacitance voltage instantaneous value be multiply by 1, obtain described voltage adjustment amount;
If described alternating current instantaneous value is in negative half-cycle, then default capacitance voltage reference value and the difference of described capacitance voltage instantaneous value be multiply by-1, obtain described voltage adjustment amount;
When the capacitance voltage of submodule satisfies default capacitance voltage reference value UdcRef〉during capacitance voltage instantaneous value Udcj, this submodule need to come for the dc capacitor charging, until this submodule capacitance voltage instantaneous value rises to reference value by absorb energy from AC.When the capacitance voltage of submodule satisfied UdcRef＜Udcj, this submodule need to be by releasing energy to AC for the dc capacitor discharge, until this submodule capacitance voltage instantaneous value is down to reference value; In the present embodiment, default capacitance voltage reference value and the difference of described capacitance voltage instantaneous value be multiply by 1, obtain described voltage adjustment amount, thereby generate positive voltage stabilizing control signal, the sinusoidal modulation wave that is added to can increase service time of submodule; Default capacitance voltage reference value and the difference of described capacitance voltage instantaneous value be multiply by-1, obtain described voltage adjustment amount, thereby generate the voltage stabilizing control signal of bearing, the sinusoidal modulation wave that is added to can reduce service time of submodule.
In a preferred embodiment, described voltage adjustment amount is inputed to proportional and integral controller, generate described voltage stabilizing control signal, the passing ratio integral controller can generate the voltage stabilizing control signal fast.
In a preferred embodiment, described capacitance voltage control signal is pulse width modulating signal, and described voltage stabilizing control signal is added to behind the described sinusoidal modulation wave, intersects with triangular wave carrier to produce described pulse width modulating signal.
As shown in Figure 2, be the capacitance voltage control system structural representation in one embodiment of a kind of Unified Power Quality Controller of the present invention, comprising:
Voltage adjustment amount module 22 is used for obtaining the voltage adjustment amount according to default capacitance voltage reference value and described capacitance voltage instantaneous value;
Laminating module 24 inputs to the sinusoidal modulation wave of described submodule, the sinusoidal modulation wave after being adjusted for described voltage stabilizing control signal is added to;
General upper and lower half brachium pontis of Unified Power Quality Controller n the submodule of all connecting.Establishment stage at capacitance voltage, at first the output of auxiliary direct current potential source is accordingly just being received MMC, on the negative dc bus, include two identical IGBT(Insulated Gate Bipolar Transistor in each submodule, insulated gate bipolar transistor), keep the IGBT T1 in 2n the submodule to be always off state, IGBT T2 in the submodule to be charged also is off state, IGBT T2 in all the other (2n-1) individual submodules is opening state, direct voltage source is just only to the capacitor charging of this submodule to be charged like this, when this submodule electric capacity to be filled reaches working voltage by the time, its charging is complete, IGBT T2 on it is become opening state by original off state, meanwhile, IGBT T2 in the next one submodule to be charged is become off state by original opening state, direct voltage source just can turn to this submodule charging like this, by that analogy, just can realize the successively charging to 2n submodule in the phase brachium pontis.Complete to final charging, can direct voltage source be disconnected by diode or the mechanical switch of series connection.
The capacitance energy storage instantaneous value is determined jointly by the capacitance of dc capacitor and the instantaneous value of this moment capacitance voltage, after electric capacity is selected, there is one to one relation between capacitance energy storage and the capacitance voltage, thereby, can realize by the increase and decrease of control capacitance energy storage raising or reduce the target of capacitance voltage.
When capacitance voltage need to boost, can be by the charging interval that increases electric capacity in each cycle and the energy storage that increases gradually electric capacity discharge time that reduces electric capacity; In like manner, when capacitance voltage needs step-down, can be by the charging interval that reduces electric capacity in each cycle and the energy storage that reduces gradually electric capacity discharge time that increases electric capacity; Therefore, the control of the capacitance voltage of Unified Power Quality Controller can approach default capacitance voltage reference value fast and accurately by each capacitance voltage of relatively realizing of each submodule capacitance voltage instantaneous value and capacitance voltage reference value; Get access to first the current capacitance voltage instantaneous value of submodule in the Unified Power Quality Controller in the present embodiment; According to default capacitance voltage reference value and described capacitance voltage instantaneous value, obtain the voltage adjustment amount again; According to this voltage adjustment amount, then can generate the voltage stabilizing control signal; At last described voltage stabilizing control signal is added to and inputs on the sinusoidal modulation wave of described submodule the capacitance voltage control signal after being adjusted; Adjust the service time of electric capacity in the submodule according to the capacitance voltage control signal after this adjustment, thereby reduce the difference of the capacitance voltage value of each submodule and reality, control the identical capacitance voltage of each submodule output.
In a preferred embodiment, as shown in Figure 3, described voltage adjustment amount module 22 also can comprise:
First module 222 that multiplies each other is in positive half period if be used for described alternating current instantaneous value, then default capacitance voltage reference value and the difference of described capacitance voltage instantaneous value be multiply by 1, obtains described voltage adjustment amount;
When the capacitance voltage of submodule satisfies default capacitance voltage reference value UdcRef〉during capacitance voltage instantaneous value Udcj, this submodule need to come for the dc capacitor charging, until this submodule capacitance voltage instantaneous value rises to reference value by absorb energy from AC.When the capacitance voltage of submodule satisfied UdcRef＜Udcj, this submodule need to be by releasing energy to AC for the dc capacitor discharge, until this submodule capacitance voltage instantaneous value is down to reference value; In the present embodiment, default capacitance voltage reference value and the difference of described capacitance voltage instantaneous value be multiply by 1, obtain described voltage adjustment amount, thereby generate positive voltage stabilizing control signal, the sinusoidal modulation wave that is added to can increase service time of submodule; Default capacitance voltage reference value and the difference of described capacitance voltage instantaneous value be multiply by-1, obtain described voltage adjustment amount, thereby generate the voltage stabilizing control signal of bearing, the sinusoidal modulation wave that is added to can reduce service time of submodule.
In a preferred embodiment, described signal generation module 23 also is used for described voltage adjustment amount is inputed to proportional and integral controller, generates described voltage stabilizing control signal, and the passing ratio integral controller can generate the voltage stabilizing control signal fast.
In a preferred embodiment, the described capacitance voltage control signal in the described laminating module 24 is pulse width modulating signal, and described voltage stabilizing control signal is added to behind the described sinusoidal modulation wave, intersects with triangular wave carrier to produce described pulse width modulating signal.
Capacitance voltage control method and the system of Unified Power Quality Controller of the present invention, get access to the current capacitance voltage instantaneous value of submodule in the Unified Power Quality Controller, according to default capacitance voltage reference value and described capacitance voltage instantaneous value, obtain the voltage adjustment amount again; According to this voltage adjustment amount, then can generate the voltage stabilizing control signal; At last described voltage stabilizing control signal is added to and inputs on the sinusoidal modulation wave of described submodule the capacitance voltage control signal after being adjusted; The service time of each submodule of sinusoidal modulation wave capable of regulating after adjusting according to this, thus the difference of each submodule and actual capacitance voltage value reduced, control the identical capacitance voltage of each submodule output.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (8)
1. the capacitance voltage control method of a Unified Power Quality Controller is characterized in that, comprises the steps:
Obtain the current capacitance voltage instantaneous value of submodule in the Unified Power Quality Controller;
Capacitance voltage reference value and described capacitance voltage instantaneous value according to default obtain the voltage adjustment amount;
According to described voltage adjustment amount, generate the voltage stabilizing control signal;
Described voltage stabilizing control signal is added to inputs on the sinusoidal modulation wave of described submodule the capacitance voltage control signal after being adjusted.
2. the capacitance voltage control method of Unified Power Quality Controller according to claim 1 is characterized in that, capacitance voltage reference value and described capacitance voltage instantaneous value that described basis is default, and the step that obtains the voltage adjustment amount is:
Detect the current alternating current instantaneous value of described submodule;
If described alternating current instantaneous value is in positive half period, then default capacitance voltage reference value and the difference of described capacitance voltage instantaneous value be multiply by 1, obtain described voltage adjustment amount;
If described alternating current instantaneous value is in negative half-cycle, then default capacitance voltage reference value and the difference of described capacitance voltage instantaneous value be multiply by-1, obtain described voltage adjustment amount.
3. the capacitance voltage control method of Unified Power Quality Controller according to claim 1 and 2 is characterized in that, described voltage adjustment amount is inputed to proportional and integral controller, generates described voltage stabilizing control signal.
4. the capacitance voltage control method of Unified Power Quality Controller according to claim 3, it is characterized in that, described capacitance voltage control signal is pulse width modulating signal, described voltage stabilizing control signal is added to behind the described sinusoidal modulation wave, intersects with triangular wave carrier and produce described pulse width modulating signal.
5. the capacitance voltage control system of a Unified Power Quality Controller is characterized in that, comprising:
Acquisition module is used for obtaining the current capacitance voltage instantaneous value of Unified Power Quality Controller submodule;
Voltage adjustment amount module is used for obtaining the voltage adjustment amount according to default capacitance voltage reference value and described capacitance voltage instantaneous value;
The signal generation module is used for according to described voltage adjustment amount, generates the voltage stabilizing control signal;
Laminating module inputs to the sinusoidal modulation wave of described submodule, the capacitance voltage control signal after being adjusted for described voltage stabilizing control signal is added to.
6. the capacitance voltage control system of Unified Power Quality Controller according to claim 5 is characterized in that, described voltage adjustment amount module comprises:
Detection module is for detection of the current alternating current instantaneous value of described submodule;
First module that multiplies each other is in positive half period if be used for described alternating current instantaneous value, then default capacitance voltage reference value and the difference of described capacitance voltage instantaneous value be multiply by 1, obtains described voltage adjustment amount;
Second module that multiplies each other is in negative half-cycle if be used for described alternating current instantaneous value, then default capacitance voltage reference value and the difference of described capacitance voltage instantaneous value be multiply by-1, obtains described voltage adjustment amount.
7. according to claim 5 or the capacitance voltage control system of 6 described Unified Power Quality Controllers, it is characterized in that, described signal generation module also is used for described voltage adjustment amount is inputed to proportional and integral controller, generates described voltage stabilizing control signal.
8. the capacitance voltage control system of Unified Power Quality Controller according to claim 7, it is characterized in that, described capacitance voltage control signal in the described laminating module is pulse width modulating signal, described voltage stabilizing control signal is added to behind the described sinusoidal modulation wave, intersects with triangular wave carrier and produce described pulse width modulating signal.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103956928A (en) * | 2014-04-08 | 2014-07-30 | 华南理工大学 | Method for controlling voltage of direct current capacitors in double-output and three-switch-set MMC inverter |
| CN106921157A (en) * | 2015-12-28 | 2017-07-04 | 国网智能电网研究院 | A kind of AC singlephase earth fault control method of flexible ring net controller |
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| CN103956928A (en) * | 2014-04-08 | 2014-07-30 | 华南理工大学 | Method for controlling voltage of direct current capacitors in double-output and three-switch-set MMC inverter |
| CN103956928B (en) * | 2014-04-08 | 2017-04-12 | 华南理工大学 | Method for controlling voltage of direct current capacitors in double-output and three-switch-set MMC inverter |
| CN106921157A (en) * | 2015-12-28 | 2017-07-04 | 国网智能电网研究院 | A kind of AC singlephase earth fault control method of flexible ring net controller |
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