CN100480721C - Distribution type electric power system island movement detection device and method - Google Patents
Distribution type electric power system island movement detection device and method Download PDFInfo
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- CN100480721C CN100480721C CN 200610072273 CN200610072273A CN100480721C CN 100480721 C CN100480721 C CN 100480721C CN 200610072273 CN200610072273 CN 200610072273 CN 200610072273 A CN200610072273 A CN 200610072273A CN 100480721 C CN100480721 C CN 100480721C
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Abstract
The invention relates to a check device of distribution power system island operation and a relative method, wherein a power converter of a distribution power supply is operated into a virtual capacitor or a virtual inducer which operation frequency is approach and some lower or higher than the operation frequency of a commercial power. When the commercial power is accident, the distribution power supply powers independently, and the virtual capacitor or virtual inducer works to change the amplitude and frequency of a load voltage significantly, thereby checking the island operation instantly.
Description
Technical field
The invention relates to a kind of pick-up unit and method thereof of distribution type electric power system island movement, particularly about at a distributed power supply system behind an electric power converter and a mains supply system connection, can detect the fault of this mains supply system, so that the pick-up unit and the method thereof of the island movement that this distributed power supply system and this mains supply system are de-connected.
Background technology
Small power generation system or renewable source of energy generation system can constitute the small distributed power-supply system.Renewable source of energy generation comprises solar electrical energy generation, wind-power electricity generation, fuel cell and incinerator generating etc. at present.Following will have many small distributed power-supply systems to be merged in running in the general distribution system.
The small distributed power-supply system directly is connected in parallel to the mains supply system, to supply power to load.At this moment, the due care measure that electrical power trans mission/distribution system need be correlated with wherein comprises the detection of electric power Quality Detection and island movement.The detection of so-called island movement is to hinder for some reason or safeguards and when cutting off, still have small distributed power-supply system continued power in the mains supply system, thereby the part distribution system presents and is subjected to electric island movement phenomenon separately.This island movement phenomenon causes following point:
1, harm is positioned at the maintenance personal's in island movement zone safety;
2, cause the voltage and the frequency shakiness in island movement zone, thereby damage the consumer that is positioned at the island movement zone;
3, cause the protection electricity post (protection relay) that is positioned at the island movement zone to produce misoperation (malfunction);
4, when the mains supply system recovery is powered, may produce nonsynchronous problem.
In view of this, the research institution by states such as Europe, the United States, days works out the control codes and standards one after another in the world, as IEEE929, IEEE1547, VDE0126 and UL1741 etc.
The island movement detection method mainly comprises active detection method and passive-type detection method at present.The passive-type detection method is to utilize sensed system parameter to change, to differentiate whether the island movement phenomenon takes place, as system frequency detection method, voltage amplitude detection method and harmonic content detection method etc.Yet these passive-type detection methods all have a not sensing zone, and so-called not sensing zone is the situation that these passive-type detection methods can't detect island movement, so the passive-type detection method can't satisfy above-mentioned control codes and standards fully.
As for active detection method, it is to add micro-microvariations in the output current of distributed power supply system.When the mains supply system just often because mains supply is enough strong, therefore should the trace microvariations are unlikely have any impact.Otherwise, in case during the mains supply system break, because these trace microvariations can cause the significantly variation of frequency or voltage, so it can be detected and decidable be that the island movement phenomenon takes place by the electric post of protection.At this moment, this mains supply system and distributed power supply system are de-connected immediately, to avoid taking place the island movement phenomenon.
Active detection method commonly used, as No. the 5493485th, United States Patent (USP), it discloses to utilize distributed power supply system is produced phase deviation and harmonic distortion, to detect this distributed power supply system whether the island movement phenomenon takes place.Another active detection method commonly used, as No. the 6172889th, United States Patent (USP), it discloses to utilize distributed power supply system is produced a frequency shift (FS) output current, utilizes the positive feedback mode to detect this distributed power supply system more whether the island movement phenomenon takes place.Another active detection method commonly used, as No. the 430731st, TaiWan, China patent announcement, it discloses to utilize distributed power supply system is produced an asymmetric output current, to detect this distributed power supply system whether the island movement phenomenon takes place.Another active detection method commonly used, as No. the 6603290th, United States Patent (USP), it discloses to utilize a certain amount of harmonic wave is inputed in the distributed power supply system, measures the impedance of this distributed power supply system again, to detect this distributed power supply system whether the island movement phenomenon takes place.
As mentioned above, these active detection methods all utilize the electric power converter with distributed power supply system to produce a slight distortion, detect the phenomenon of this distribution type electric power system island movement when the mains supply system break.Yet these active detection methods all must be subject to relevant international control codes and standards, so the rate of total harmonics of the supply of current of distributed power supply system must be less than 5%.In brief, the current distortion that these active detection methods produce must be restricted, thereby influence detects the time and the fiduciary level of island movement phenomenon, therefore still may have a not sensing zone, and also relative complex of its structure that adopts control circuit.
In view of this, the present invention is operable to a simulated capacitance or inductor in order to improve above-mentioned shortcoming with a distributed power supply system, and the operating frequency of this simulated capacitance or inductor is approaching and lower slightly or a little more than the operating frequency of a mains supply.When this mains supply just often, because the voltage of this mains supply is load voltage, because very strong and its voltage of this mains supply does not comprise the operating frequency of this virtual capacitor or inductor, so the output current of this distributed power supply system is influenced hardly and keep the rate of total harmonics that is lower than the control codes and standards; Otherwise, when this mains power fails or when undesired, because strong mains supply has not existed and can't provide the voltage of fixing operation frequency to be supplied to load, therefore, supply power to load separately by this distributed power supply system, so the virtual capacitor or the inductor of this distributed power supply system operation will be had an effect, thereby the operating frequency of load voltage moved near the operating frequency of this virtual capacitor or inductor, and cause the amplitude of this load voltage and frequency to produce significantly change, so can detect in real time whether the island movement phenomenon takes place, as this mains supply system and distributed power supply system are de-connected immediately when detecting the island movement phenomenon, with respect to active detection method commonly used, it can have shortening detection time, reduce the distributed power supply system output current distortion, and promote the fiduciary level that detects.
Summary of the invention
Fundamental purpose of the present invention provides a kind of pick-up unit and method thereof of island movement of distributed power supply system, it is operable to a virtual capacitor or inductor with distributed power supply system, and the operating frequency of this virtual capacitor or inductor is approaching and lower slightly or a little more than the normal running frequency of this mains supply.When this mains supply just often, load voltage is line voltage, because this mains supply is very strong and do not comprise the operating frequency of this virtual capacitor/inductor, this virtual capacitor or inductor will not produce effect, therefore, mains supply just often, the pick-up unit of this island movement and method thereof can produce the output current of distributed power source hardly and disturb.When this mains power fails or when undesired, because strong mains supply does not exist and can't provide the voltage of fixing operation frequency to be supplied to load, therefore supply power to this load separately by this distributed power supply system, and this virtual capacitor or inductor are had an effect, thereby the operating frequency of load voltage moved near the operating frequency of this virtual capacitor or inductor, and cause the amplitude of this load voltage and frequency to produce significantly change, so can detect the phenomenon whether island movement takes place in real time, make the present invention have shortening detection time, reduce the distributed power supply system output current distortion, and promote the fiduciary level that detects.
Secondary objective of the present invention provides a kind of pick-up unit and method thereof of island movement of distributed power supply system, it is in that a distributed power supply system is operable to a virtual capacitor is in parallel with load, the operating frequency of this virtual capacitor near and a little less than the normal running frequency of this mains supply.When this mains power fails or when undesired, because strong mains supply has not existed the voltage that the fixing operation frequency can't be provided to be supplied to this load, therefore power separately by this distributed power supply system, and this virtual capacitor is had an effect at this moment, the load equivalent total capacitance is increased, thereby the operating frequency of load voltage moved toward low frequency fast, and move near the setting operation frequency of this virtual capacitor, this will cause the amplitude of this load voltage and frequency to produce significantly change, so be convenient to the phenomenon whether real-time detection island movement takes place, make the present invention have shortening detection time, reduce the distributed power supply system output current distortion and promote the fiduciary level that detects.
Another object of the present invention provides a kind of pick-up unit and method thereof of island movement of distributed power supply system, it is in that a distributed power supply system is operable to a virtual inductor is in parallel with load, the operating frequency of this virtual inductor near and a little more than the operating frequency of a mains supply.When this mains power fails or when undesired, because strong mains supply has not existed the voltage that the fixing operation frequency can't be provided to be supplied to this load, therefore this virtual inductor is had an effect by the independent power supply of this distributed power supply system, load equivalent total inductance amount is reduced, thereby the operating frequency of load voltage moved toward high frequency fast, and move near the setting operation frequency of this virtual inductor, cause this moment the amplitude and the frequency of this load voltage to produce significantly change, so can be easy to real-time detection whether the island movement phenomenon takes place, make the present invention have shortening detection time, reduce the distributed power supply system output current distortion and promote the fiduciary level that detects.
Description of drawings
Fig. 1: the calcspar of mains supply system of the present invention and distributed power supply system framework.
Figure 1A: the process block diagram of the island movement method for detecting of distributed power supply system of the present invention.
Fig. 2: the calcspar of the pick-up unit of the island movement of the present invention's first preferred embodiment distributed power supply system.
Fig. 3: the calcspar of the pick-up unit of the island movement of the present invention's second preferred embodiment distributed power supply system.
Symbol description:
1 mains supply, 2 distributed power sources, 20 direct supplys, 21 electric power converters
3 loads, 30 load voltages, 4 first electromagnetic switch, 5 second electromagnetic switch
Pick-up unit 600 voltage detectors 601 first bandpass filter of 6 island movements
602 multipliers, 603 subtracters, 604 second bandpass filter
605 integrators, 606 totalizers, 607 electric current detectors, 608 subtracters
609 current controllers, 610 driving circuits
Pick-up unit 700 voltage detectors 701 first bandpass filter of 7 island movements
702 multipliers, 703 subtracters, 704 second bandpass filter
705 differentiators, 706 totalizers, 707 electric current detectors, 708 subtracters
709 current controllers, 710 driving circuits
Embodiment
For above-mentioned and other purpose of the present invention, feature, advantage can be become apparent, hereinafter will be especially exemplified by preferred embodiment of the present invention, and cooperate appended graphicly, be described in detail below.
Fig. 1 discloses the calcspar of mains supply system of the present invention and distributed power supply system framework.Please refer to shown in Figure 1, one mains supply 1 is in order to provide the AC energy of a fixed frequency, and distributed power supply system comprises a direct current electric energy 20 and an electric power converter 21, wherein this direct current energy 20 can be from solar cell, fuel cell, aerogenerator or other energy after the AC/DC conversion, and this electric power converter 21 is converted to an AC energy in order to the direct current energy with this direct supply 20.This mains supply 1 and distributed power source 2 form in parallel through first electromagnetic switch 4 and second electromagnetic switch 5, it is in order to provide a load voltage 30, so that supply electric energy to a load 3.One first electromagnetic switch 4 is connected between this mains supply 1 and the load 3, and it is in order to de-connect this mains supply 1.Same, one second electromagnetic switch 5 is connected between this distributed power source 2 and the load 3, and it is in order to de-connect this distributed power source 2.Wherein first electromagnetic switch 4 and second electromagnetic switch 5 also can be solid-state switch or other switch.
Please refer to shown in Figure 1A, it discloses the process block diagram of the island movement detection method of distributed power supply system of the present invention.Please refer to shown in Fig. 1 and Figure 1A, island movement detection method of the present invention comprises step: this mains supply 1 is connected to this distributed power source 2; The electric power converter 21 of controlling this distributed power source 2 provides a basic wave real power to distribution system, and with this electric power converter 21 near and be not equal under the frequency of this mains supply 1 and be operable to virtual impedance; When this mains supply 1 just often, this distributed power source 2 sees through this electric power converter 21 provides a basic wave real power to distribution system, this virtual impedance does not produce effect; When this mains supply 1 fault, this virtual impedance is had an effect, and for detecting the island movement phenomenon takes place.
Fig. 2 discloses the control calcspar of pick-up unit of the island movement of the present invention's first preferred embodiment distributed power supply system.Please refer to Figure 1 and Figure 2, the pick-up unit 6 of one island movement is operable to a virtual inductor in order to the electric power converter 21 with this distributed power source 2, the operating frequency of this virtual inductor near and a little more than the operating frequency of this mains supply 1, to detect the island movement phenomenon.
Referring again to shown in Figure 2, the pick-up unit 6 of this island movement comprises a voltage detector 600, one first bandpass filter 601, a multiplier 602, a subtracter 603, one second bandpass filter 604, an integrator 605, a totalizer 606, an electric current detector 607, a subtracter 608, a current controller 609 and one drive circuit 610.
Referring again to Figure 1 and Figure 2, this electric power converter 21 adopts current control mode, and its reference signal comprises-a real power control system signal S1 and a virtual inductor control signal S2.The real merit amount of this reality power control system signal S1 in order to determine that this distributed power source 2 is sent, this reality power control system signal S1 is a string ripple signal, this reality power control system signal S1 must with the voltage same frequency and the same-phase of this mains supply 1.At first, after this load voltage 30 is detected by this voltage detector 600, deliver to this first bandpass filter 601, the centre frequency of this first bandpass filter 601 is the basic wave frequency of this mains supply 1, this first bandpass filter 601 is output as a string ripple signal, the voltage same frequency and the same-phase of itself and this mains supply 1.This multiplier 602 is that the output of this first bandpass filter 601 and an amplitude signal are multiplied each other, to obtain this reality power control system signal S1.This reality power control system signal S1 is in order to control the real power that this distributed power source 2 produces, the energy size decision that this amplitude signal is produced by this direct current energy 20.
Referring again to Figure 1 and Figure 2,, be shown below because the integrated value of the current signal of an inductor and this inductor voltage is proportional:
Therefore, if the proportional electric current of integrated value of these electric power converter 21 generations one and this load voltage 30, this electric power converter 21 has the effect of inductor, yet it is not real inductor, so title is virtual inductor.Therefore this virtual inductor control signal S2 is with the integrated value of ratio in this load voltage 30, this virtual inductor control signal S2 in order to this electric power converter 21 frequency near and be operable to a virtual inductor when being not equal to the frequency of this mains supply 1, to detect the island movement phenomenon.This load voltage 30 that this voltage detector 600 detects is delivered to this subtracter 603 with the output of this first bandpass filter 601 and is subtracted each other, and this subtracter 603 is output as the non-mains frequencies composition of this load voltage 30.The result that subtracts each other of this subtracter 603 is delivered to this second bandpass filter 604, the centre frequency of this second bandpass filter 604 near but be not equal to the operating frequency of this mains supply 1.This integrator 605 is delivered in the output of this second bandpass filter 604, and this integrator 605 is output as this virtual inductor control signal S2.
Referring again to shown in Figure 2, at last should reality power control system signal S1 and this virtual inductor control signal S2 deliver to this totalizer 606 additions, to obtain the reference signal of this electric power converter 21.The output current of this electric power converter 21 detects through this electric current detector 607, then this subtracter 608 is delivered in this totalizer 606 and the output of electric current detector 607, then the output of this subtracter 608 is delivered to this current controller 609, at last the output of this current controller 609 is delivered to the drive signal that this driving circuit 610 produces the power electronic switch assembly of this electric power converter 21 again.
Referring again to Figure 1 and Figure 2, when this mains supply 1 just often, because this mains supply 1 is very strong, and this load 3 is directly powered by this mains supply 1, so the frequency variation of this load voltage 30 is very little, and only contain a small amount of harmonic wave composition, so the output of this subtracter 603 and this second bandpass filter 604 is almost nil, so this virtual inductor control signal S2 is also almost nil.At this moment, this reference signal mainly is made up of this reality power control system signal S1, meaning promptly, when this mains supply 1 just often, 2 of this distributed power sources send operating frequency with this mains supply 1 identical and with the synchronous string ripple of this mains supply 1 voltage electric current, because this virtual inductor control signal S2 is almost nil, so work as this mains supply 1 just often, the total harmonic distortion of the output current of this distributed power source 2 is very little.
Referring again to Figure 1 and Figure 2, otherwise, when mains supply 1 fault, because setting up, the voltage of this load voltage 30 must rely on this distributed power source 2, this mains supply 1 instant of failure will produce an instantaneous variation, make the output of this second bandpass filter 604 become big, it is big that this virtual inductor control signal S2 also becomes thereupon, because the effect of this integrator 605, can learn that by Basis Theory of Circuitry the electric current of inductor is the integration of voltage, therefore, even these electric power converter 21 generations one of this virtual inductor control signal S2 are proportional to the magnitude of current of the basic wave radio-frequency component integration of non-mains supply 1 in this load voltage 30, so this electric power converter 21 promptly is operable to a virtual inductor and is parallel to this load 3, the total inductance value of load is descended, and make the natural oscillation frequency of load rise, therefore the frequency of this load voltage 30 up can be promoted, make output and this virtual inductor control signal S2 of this second bandpass filter 604 continue to amplify, the inductance effect of these electric power converter 21 operations is exaggerated again, frequency through this load voltage 30 of this process is by near the centre frequency near this second bandpass filter 604, this moment, the amplitude of load voltage also produced variation significantly, therefore, can correctly and apace detect the island movement phenomenon by the frequency of this load voltage 30 and the change of amplitude, and then cut off this mains supply 1.The present invention can correctly and apace detect the island movement phenomenon by the frequency of this load voltage 30 and the change of amplitude, and cuts off this mains supply 1.
Fig. 3 discloses the control calcspar of pick-up unit of the island movement of the present invention's second preferred embodiment distributed power supply system.Please refer to Fig. 1 and shown in Figure 4, the pick-up unit 7 of one island movement is operable to a virtual capacitor in order to the electric power converter 21 with this distributed power source 2, the operating frequency of this virtual capacitor near and a little less than the operating frequency of this mains supply 1, to detect the phenomenon of island movement.
Referring again to shown in Figure 3, the pick-up unit 7 of this island movement comprises a voltage detector 700, one first bandpass filter 701, a multiplier 702, a subtracter 703, one second bandpass filter 704, a differentiator 705, a totalizer 706, an electric current detector 707, a subtracter 708, a current controller 709 and one drive circuit 710.
Referring again to Fig. 1 and shown in Figure 3, this electric power converter 21 adopts current control mode, and its reference signal comprises-a real power control system signal S1 and a virtual capacitor control signal S2.The real merit amount of this reality power control system signal S1 in order to determine that this distributed power source 2 is sent, this reality power control system signal S1 belongs to a string ripple signal, this string ripple signal must with the voltage same frequency and the same-phase of this mains supply 1.At first, after this load voltage 30 is detected by this voltage detector 700, deliver to this first bandpass filter 701, the centre frequency of this first bandpass filter 701 is the basic wave frequency of this mains supply 1, this first bandpass filter 701 is output as a string ripple signal, the voltage same frequency and the same-phase of itself and this mains supply 1.This multiplier 702 is that the output of this first bandpass filter 701 and an amplitude signal are multiplied each other, to obtain this reality power control system signal S1.This reality power control system signal S1 is in order to control the real power that this distributed power source 2 produces, the energy size decision that this amplitude signal is produced by this direct current energy 20.
Referring again to Fig. 1 and shown in Figure 3,, be shown below because the differential value of the current signal of a capacitor and this condenser voltage is proportional:
Therefore, if this electric power converter 21 can produce one with the proportional electric current of differential value of this load voltage 30, this electric power converter 21 has the effect of capacitor, however it is not real capacitor, so be referred to as virtual capacitor.Therefore this virtual capacitor control signal S2 is with the differential value of ratio in this load voltage 30, this virtual capacitor control signal S2 in order to this electric power converter 21 frequency near and be operable to a virtual capacitor when being not equal to the frequency of this mains supply 1, to detect the island movement phenomenon.This load voltage 30 that this voltage detector 700 detects is delivered to this subtracter 703 with the output of this first bandpass filter 701 and is subtracted each other, and this subtracter 703 is output as the non-mains frequencies composition of this load voltage 30.The result that subtracts each other of this subtracter 703 is delivered to this second bandpass filter 704, the centre frequency of this second bandpass filter 704 near and be not equal to the operating frequency of this mains supply 1.This differentiator 705 is delivered in the output of this second bandpass filter 704, and this differentiator 705 is output as this virtual capacitor control signal S2.
Referring again to shown in Figure 3, at last should reality power control system signal S1 and this virtual capacitor control signal S2 deliver to this totalizer 706 additions, to obtain the reference signal of this electric power converter 21.The output current of this electric power converter 21 detects through this electric current detector 707, then this subtracter 708 is delivered in this totalizer 706 and the output of electric current detector 707, then the output of this subtracter 708 is delivered to this current controller 709, at last the output of this current controller 709 is delivered to the drive signal that this driving circuit 710 produces the power electronic switch assembly of this electric power converter 21 again.
Referring again to Fig. 1 and shown in Figure 3, when this mains supply 1 just often, because this mains supply 1 is very strong, and this load 3 is directly powered by this mains supply 1, so the frequency variation of this load voltage 30 is very little, and only contain a small amount of harmonic wave composition, so the output of this subtracter 703 and second bandpass filter 704 is almost nil, so this virtual capacitor control signal S2 is also almost nil.At this moment, this reference signal mainly is made up of this reality power control system signal S1.Promptly, when this mains supply 1 just often, 2 of this distributed power sources send operating frequency with this mains supply 1 identical and with the synchronous string ripple of this mains supply 1 voltage electric current, because this virtual capacitor control signal S2 is almost nil, so just often the total harmonic distortion of the output current of this distributed power source 2 is very little when this mains supply 1.
Referring again to Fig. 1 and shown in Figure 3, otherwise, when mains supply 1 fault, because setting up, the voltage of this load voltage 30 must rely on this distributed power source 2, this mains supply 1 instant of failure will produce an instantaneous variation, make the output of this second bandpass filter 704 become big, it is big that this virtual capacitor control signal S2 also becomes thereupon, because the effect of this differentiator 705, can learn that by Basis Theory of Circuitry the electric current of electric capacity is the differential of voltage, therefore, even these electric power converter 21 generations one of this virtual capacitor control signal S2 are proportional to the magnitude of current of non-mains supply 1 basic wave radio-frequency component differential in this load voltage 30, so this electric power converter 21 promptly is operable to a virtual capacitor and is parallel to this load 3, the total capacitance value of load is increased, and make the natural oscillation frequency of load descend, therefore can be with the past decline of the frequency of this load voltage 30, make output and this virtual capacitor control signal S2 of this second bandpass filter 704 continue to amplify, the capacitor effect of these electric power converter 21 operations is exaggerated again, frequency through this load voltage 30 of this process is by near the centre frequency near this second bandpass filter 704, and this moment, the amplitude of this load voltage 30 also produced variation significantly.The present invention can correctly and apace detect the island movement phenomenon by the frequency of this load voltage 30 and the change of amplitude, and cuts off this mains supply 1.
Claims (12)
1, a kind of island movement detection method of distributed power supply system, it comprises step:
One mains supply is connected to a distributed power source, and this distributed power source has a direct current power supply and is provided with an electric power converter, so that it is interconnected with this mains supply, the electric power converter of controlling this distributed power source provides a basic wave real power to distribution system, and this electric power converter is operable to a virtual impedance under the frequency near this mains supply;
When this mains supply just often, this virtual impedance does not produce effect, this distributed power source will produce one with this mains supply synchronously and the output current of low harmonics distortion, the amplitude of this load voltage and frequency are identical with this mains supply, thereby do not produce tangible change, so can determine not take place the island movement phenomenon; And
When this mains power fails, power separately by this distributed power source, thereby this virtual impedance is had an effect, this will cause the amplitude of this load voltage or frequency to produce significantly change, can detect in real time so whether the island movement phenomenon takes place, and decision de-connects this mains supply and distributed power source immediately.
2, the island movement detection method of distributed power supply system according to claim 1, wherein this electric power converter adopts current control mode.
3, the island movement detection method of distributed power supply system according to claim 1, wherein the output current of this electric power converter is determined by a reference signal.
4, the island movement detection method of distributed power supply system according to claim 3, wherein this reference signal is made up of a real power control system signal and a virtual impedance control signal.
5, the island movement detection method of distributed power supply system according to claim 4, this reality power control system signal belongs to a sinusoidal signal, the voltage same-phase and the same frequency of itself and this mains supply.
6, the island movement detection method of distributed power supply system according to claim 4, this virtual impedance control signal belong to a ratio in this load voltage composition near and be not equal to the differential or the integration of the composition of this mains frequencies.
7, the island movement detection method of distributed power supply system according to claim 4 is wherein worked as this mains supply just often, and this virtual impedance control signal will go to zero, and only there is this reality power control system signal in this reference signal; Utilize the control of an electric power converter to make this distributed power source can send a string ripple electric current, the voltage same-phase and the same frequency of this string ripple electric current and this mains supply back to.
8, the island movement detection method of distributed power supply system according to claim 4, wherein when this mains power fails, this virtual impedance control signal is non-vanishing, therefore electric power converter will be operable to a virtual impedance, this will make the operating frequency of the frequency shifts of this load voltage to this virtual impedance, or make the amplitude of this load voltage produce significantly change.
9, a kind of pick-up unit of island movement of distributed power supply system, it comprises:
One voltage detector, it is in order to detect a load voltage;
One first bandpass filter, its centre frequency are mains frequencies, and this load voltage is used to produce a string ripple signal through this first bandpass filter;
One multiplier, it is connected to this first bandpass filter, so that the string ripple signal of this first bandpass filter is delivered to this multiplier;
One amplitude signal, it delivers to this multiplier, utilizes this multiplier that the string ripple signal of this first bandpass filter and amplitude signal are multiplied each other and produces a real power control system signal;
One subtracter, it subtracts each other in order to this is detected the output of load voltage and this first bandpass filter, to obtain the composition of non-mains frequencies in this load voltage;
One second bandpass filter, it is connected to this subtracter, and its centre frequency near and be not equal to this mains frequencies;
One differentiator, it utilizes the output of this second bandpass filter to produce a virtual capacitor control signal;
One totalizer, it is in order to should reality power control system signal and this virtual capacitor control signal addition, to obtain a reference signal;
One electric current detector, it is in order to detect the output current of a distributed power supply system;
One current controller, its output current and this reference signal of importing this distributed power supply system is done control to produce a control signal; And
One drive circuit produces drive signal control electric power converter with this control signal through this driving circuit;
When a mains supply just often, this virtual capacitor control signal is zero; In case during this mains power fails, it is big that this virtual capacitor control signal becomes, thereby cause the amplitude of this load voltage or frequency to produce significantly change, so that detect the island movement phenomenon.
10, the pick-up unit of the island movement of distributed power supply system according to claim 9 is wherein worked as this mains supply just often, and this virtual capacitor control signal goes to zero, and only has this reality power control system signal; Utilize this electric power converter to control this distributed power source and can send a string ripple electric current, the voltage same-phase and the same frequency of itself and this mains supply.
11, a kind of pick-up unit of island movement of distributed power supply system, it comprises:
One voltage detector, it is in order to detect a load voltage;
One first bandpass filter, its centre frequency are mains frequencies, and this load voltage is used to produce a string ripple signal through this first bandpass filter;
One multiplier, it is connected to this first bandpass filter, so that the string ripple signal of this first bandpass filter is delivered to this multiplier;
One amplitude signal, it delivers to this multiplier, utilizes this multiplier that the string ripple signal of this first bandpass filter and amplitude signal are multiplied each other and produces a real power control system signal;
One subtracter, it subtracts each other in order to this is detected the output of load voltage and this first bandpass filter, to obtain the composition of non-mains frequencies in this load voltage;
One second bandpass filter, it is connected to this subtracter, and its centre frequency near and be not equal to this mains frequencies;
One integrator, it utilizes the output of this second bandpass filter to produce a virtual inductor control signal;
One totalizer, it is in order to should reality power control system signal and this virtual inductor control signal addition, to obtain a reference signal;
One electric current detector, it is in order to detect the output current of a distributed power supply system;
One current controller, its output current and this reference signal of importing this distributed power supply system is done control to produce a control signal; And
One drive circuit produces drive signal control electric power converter with this control signal through this driving circuit;
When a mains supply just often, this virtual inductor control signal is zero; In case during this mains power fails, it is big that this virtual inductor control signal becomes, thereby cause the amplitude of this load voltage or frequency to produce significantly change, so that detect the island movement phenomenon.
12, the pick-up unit of the island movement of distributed power supply system according to claim 11 is wherein worked as this mains supply just often, and this virtual inductor control signal goes to zero, and only has this reality power control system signal; Utilize this electric power converter to control this distributed power source and can send a string ripple electric current, the voltage same-phase and the same frequency of itself and this mains supply.
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| CN101986496A (en) * | 2010-09-29 | 2011-03-16 | 天津大学 | Method for forming islands of distribution system containing distributed power supply |
| US9520819B2 (en) | 2014-02-28 | 2016-12-13 | General Electric Company | System and method for controlling a power generation system based on a detected islanding event |
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| CN101986496B (en) * | 2010-09-29 | 2012-08-08 | 天津大学 | Method for forming islands of distribution system containing distributed power supply |
| US9520819B2 (en) | 2014-02-28 | 2016-12-13 | General Electric Company | System and method for controlling a power generation system based on a detected islanding event |
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