CN102156233A - Method for detecting island by intermittent two-sided reactive power disturbance - Google Patents
Method for detecting island by intermittent two-sided reactive power disturbance Download PDFInfo
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Abstract
The invention discloses a method for island detection by adopting intermittent two-sided reactive power disturbance. A frequency of a voltage of a common coupling point is out of allowance range after an island occurs by introducing the intermittent two-sided reactive power disturbance into the output reactive power of a grid-connected inverter, so that the aim of the island detection is fulfilled. By the method, an island phenomenon can be detected immediately and effectively, and grid-connected power factors are less influenced.
Description
Technical field
The present invention relates to the island detection technology in distributed generation system and the combining inverter application, the island detection method of especially intermittent bilateral reactive power disturbance.
Background technology
In the new forms of energy distributed power generation, the electric energy that wind energy, photovoltaic etc. produce is connected to the grid through after the Technics of Power Electronic Conversion.Combining inverter can carry out conversion and carry out quality of power supply control as the interface between new forms of energy and the electrical network electric energy.Usually grid-connected inverting system comprises the single-phase or three-phase grid-connected inverter based on the pulse-length modulation control of HF switch, be used for realizing between inverter and the electrical network transformer of electrical isolation, be used for the relay that inverter is incorporated into the power networks and controls, local load, electrical network and be used to produce the inverter bridge drive signal, drive locking signal and the parallel network reverse controller of the relay control signal that is incorporated into the power networks, the output of combining inverter through behind the isolating transformer by and network relay be connected with electrical network, and the tie point between network relay and the electrical network is called point of common coupling PCC.When external power grid broke down, combining inverter can break away from electrical network, formed the local electric network composition that has Blast Furnace Top Gas Recovery Turbine Unit (TRT) and local load, thereby formed isolated island.
The generation of isolated island generally is uncertain, and can bring following harm:
(1) break away from electrical network after, the distributed power generation device may damage because voltage or frequency are out of control;
(2) local consumer may be because voltage in the isolated island or frequency exceed safe range and damage;
(3) personal safety is constituted certain threat;
(4) during isolated island, if the capacity of local load is excessive, distributed power source damages because of overload;
(5) when the electrical network reclosing, voltage magnitude, frequency and the phase place of distributed power source voltage amplitude, frequency and phase place and electrical network are inconsistent during owing to isolated island, cause the failure of closing a floodgate.
The generation of isolated island generally is uncertain, and may damage the distributed power generation device, damages local consumer, simultaneously personal safety is constituted certain threat.So, must detect isolated island rapidly, and take appropriate measures.
Island detection method commonly used mainly contains three classes: (1) passive island detection method; (2) Zhu Dong island detection method; (3) PERCOM peripheral communication detection method.
Passive detection method waits by voltage magnitude, frequency, phase place and the harmonic wave that detects point of common coupling and judges whether to take place isolated island.Comprised mainly/the under-voltage method that super/the under-frequency method, voltage-phase saltus step method and voltage harmonic mensuration etc. realized simply can not influence and network electric energy quality, but detection efficiency being low that non-detection zone is bigger.
Detection method initiatively is that disturbance is introduced in the output of combining inverter, impels isolated island that front and back point of common coupling electrical parameters (comprising voltage magnitude, frequency and phase place) take place and exceeds allowed band, thereby determine that isolated island takes place.This class detection method can improve detection efficiency, reduces non-detection zone, but can to and network electric energy quality certain influence is arranged.Traditional constant reactive power disturbance island detection method belongs to a kind of detection method of active, it introduces constant disturbance to the output reactive power of inverter, the frequency of point of common coupling voltage exceeds allowed band when impelling isolated island to take place, thereby reaches the purpose that detects isolated island.But traditional constant reactive power perturbation motion method need be introduced bigger disturbance quantity to the output reactive power of combining inverter, can influence the inverter output power factor, exists bigger defective.
The PERCOM peripheral communication detection method is to set up communication contact to detect isolated island between electrical network and distributed power generation device.But these class methods realize that difficulty is bigger, and cost is than higher.
Summary of the invention
Fundamental purpose of the present invention is to propose the island detection method of the bilateral reactive power disturbance of a kind of intermittence, can eliminate the non-detection zone of island detection, satisfies the time requirement of island detection, and very little to the influence of the power factor that is incorporated into the power networks.
The island detection method of the bilateral reactive power disturbance of intermittence of the present invention; grid-connected inverting system comprises the single-phase or three-phase grid-connected inverter based on the pulse-length modulation control of HF switch; be used for realizing between inverter and the electrical network transformer of electrical isolation; be used for the relay that inverter is incorporated into the power networks and controls; local load; electrical network and be used to produce the inverter bridge drive signal; drive the parallel network reverse controller of the locking signal and the relay control signal that is incorporated into the power networks; the output of combining inverter through behind the isolating transformer by and network relay be connected with electrical network; and the tie point between network relay and the electrical network is a point of common coupling; it is characterized in that grid-connected inverting system also comprises point of common coupling voltage sample module; phaselocked loop; the frequency judge module; the isolated island protection module; Reactive Power Control regulator and intermittent bilateral reactive power disturbing signal; intermittent bilateral reactive power disturbing signal is sent periodic disturbing signal and is given the Reactive Power Control regulator; each disturbance cycle comprises positive disturbing signal; negative disturbing signal and zero disturbing signal; the output signal of Reactive Power Control regulator is defeated by combining inverter through the parallel network reverse controller; the control combining inverter is followed the tracks of the reactive power of intermittent bilateral reactive power disturbing signal output periodic disturbance; each disturbance cycle comprises positive reactive power; negative reactive power and zero reactive power; point of common coupling voltage is imported phaselocked loop after by point of common coupling voltage sample module samples; the frequency of phaselocked loop output point of common coupling voltage; by the frequency judge module frequency values of point of common coupling voltage is judged; if frequency is greater than 50.5Hz or less than 49.5Hz; and continue 10 power frequency periods; then assert electrical network and combining inverter disengagement at this moment; isolated island takes place; the isolated island protection module is closed combining inverter, and disconnects and network relay.
Compared with prior art, the present invention has following innovative point:
(1) positive and negative bilateral reactive power disturbance has been introduced in the intermittent bilateral reactive power disturbance that proposes of the present invention, and only carries out just idle disturbance or negative idle disturbance is compared, and the amplitude of disturbance is less, and the power factor that is incorporated into the power networks is higher.
(2) after the positive and negative reactive power disturbance introduced of the intermittent bilateral reactive power disturbance that proposes of the present invention for some time combining inverter output reactive power be zero, in this intersegmental time of having a rest, the output power factor of combining inverter is 1, can effectively reduce the influence of this island detection method to power factor.
The present invention is applicable to new forms of energy grid-connected systems such as sun power, wind-force, fuel cell power generation, can effectively detect the islet operation state of combining inverter, satisfies the time requirement of island detection, and very little to the influence of the power factor that is incorporated into the power networks.
Description of drawings
The intermittent bilateral reactive power disturbance alone island detection system of Fig. 1 constitutes synoptic diagram;
The intermittent bilateral reactive power disturbance island detection method implementing procedure figure of Fig. 2;
The bilateral reactive power disturbing signal of a kind of intermittence of Fig. 3;
Fig. 4 experimental waveform that is incorporated into the power networks when adopting intermittent bilateral reactive power disturbance island detection method, CH1 among the figure: point of common coupling voltage 50V/div; CH2: grid-connected current 10A/div; CH3: inverter output reactive power 400VA/div; CH4: frequency change 0.5Hz/div; Time: 500ms/div.
Embodiment
The technical solution of the present invention is further elaborated below in conjunction with the drawings and specific embodiments.
With reference to Fig. 1; adopt the grid-connected inverting system of the island detection method of intermittent bilateral reactive power disturbance to comprise the single-phase or three-phase grid-connected inverter of controlling based on the pulse-length modulation of HF switch 1; be used for realizing between inverter and the electrical network transformer 2 of electrical isolation; be used for the relay 3 that inverter is incorporated into the power networks and controls; local load 4; electrical network 5 and be used to produce the inverter bridge drive signal; drive the parallel network reverse controller 10 of the locking signal and the relay control signal that is incorporated into the power networks; point of common coupling voltage sample module 6; phaselocked loop 7; frequency judge module 8; isolated island protection module 9; Reactive Power Control regulator 11 and intermittent bilateral reactive power disturbing signal 12; the output of combining inverter 1 through isolating transformer 2 backs by and network relay 3 be connected with electrical network 5; and the tie point between network relay 3 and the electrical network 5 is point of common coupling PCC; intermittent bilateral reactive power disturbing signal 12 is sent periodic disturbing signal and is given Reactive Power Control regulator 11; each disturbance cycle comprises positive disturbing signal; negative disturbing signal and zero disturbing signal; the output signal of Reactive Power Control regulator 11 is defeated by combining inverter 1 through parallel network reverse controller 10; control combining inverter 1 is followed the tracks of the reactive power of intermittent bilateral reactive power disturbing signal 12 output periodic disturbances; each disturbance cycle comprises positive reactive power; negative reactive power and zero reactive power; point of common coupling PCC voltage is by point of common coupling voltage sample module 6 sampling back input phaselocked loops 7; the frequency of phaselocked loop 7 output point of common coupling voltages; frequency values by 8 pairs of point of common coupling voltages of frequency judge module is judged; if frequency is greater than 50.5Hz or less than 49.5Hz; and continue 10 power frequency periods; then assert electrical network and combining inverter disengagement at this moment; isolated island takes place; isolated island protection module 9 is closed combining inverter 1, and disconnects and network relay 3.
The inventive method workflow diagram is with reference to Fig. 2, and principle is as follows:
At first, produce intermittent bilateral reactive power disturbing signal by digital signal processor TMS2808, as the reference value of Reactive Power Control regulator, this disturbing signal comprises positive disturbing signal, negative disturbing signal and zero disturbing signal.The output of Reactive Power Control regulator, through the parallel network reverse controller, the control combining inverter is followed the tracks of the reactive power that the intermittent bilateral reactive power disturbing signal output cycle changes, in a disturbance cycle, the output reactive power is the combination of three kinds of different situations, be respectively positive reactive power, negative reactive power, zero reactive power, and the order of three kinds of situations can combination in any, combining inverter runs on intermittent bilateral reactive power state of disturbance thus.
Then, the voltage of sampling point of common coupling, the process phaselocked loop calculates the frequency of point of common coupling voltage, carries out island state by the frequency judge module and judges.Concrete decision method is: phaselocked loop obtains the frequency of point of common coupling voltage; if this frequency is greater than 50.5Hz or less than 49.5Hz; think an abnormal occurrence takes place; if and abnormal occurrence in 10 continuous power frequency periods, all occurs; then assert isolated island takes place; the isolated island protection module is closed combining inverter by the parallel network reverse controller, disconnects and network relay, finishes intermittent bilateral reactive power disturbance island detection.
Combining inverter output reactive power is periodically variable, and in a disturbance cycle, the output reactive power is the combination of three kinds of different situations, be respectively positive reactive power, negative reactive power, zero reactive power, according to different combination order, can obtain two kinds of different intermittent reactive power disturbance forms, shown in Fig. 3 (a) and Fig. 3 (b), corresponding inverter output reactive power
Expression formula be
With
In the formula,
Be the amplitude of reactive power disturbance,
Be the cycle of reactive power disturbance,
Be the time of positive and negative idle disturbance,
Be that zero disturbance time was the quiescent interval, t is the time.
The intermittent bilateral reactive power disturbance form of selecting for use for example is shown in Fig. 3 (a), and excitation parameter is selected the disturbance amplitude
(
PBe the inverter active power of output), the disturbance cycle
, the positive and negative disturbing signal time
, the quiescent interval
For the influence of the intermittent bilateral reactive power disturbance island detection method of weighing proposition, can write out inverter output average power factor when carrying out intermittent bilateral reactive power disturbance to the power factor that is incorporated into the power networks
Calculation expression, for
Wherein,
Be the power factor of just idle disturbance,
Be the power factor of negative idle disturbance,
It is the power factor of zero idle disturbance.According to aforesaid excitation parameter, can obtain the average power factor that is incorporated into the power networks
Theoretical value is 0.9997, and this island detection method is very little to the influence of the power factor that is incorporated into the power networks.In the 6kW three-phase grid-connected inverter system that makes up, if combining inverter is exported when reactive power is constant to be zero, record grid-connected current THD=4.02%, power factor is 0.991; If after the intermittent bilateral reactive power disturbance that adopt to propose, experiment records combining inverter when being incorporated into the power networks, grid-connected current THD=4.13%, power factor is 0.988, experimental waveform as shown in Figure 4, wherein CH1 is a point of common coupling voltage; CH2 is a grid-connected current; CH3 is an inverter output reactive power; CH4 is the poor of point of common coupling frequency and mains frequency 50Hz, and by digital-to-analog conversion output, experimental result is 0, illustrates that this moment, the point of common coupling frequency equaled 50Hz.As seen adopt intermittent bilateral reactive power island detection method, less to the influence of the power factor that is incorporated into the power networks.
Claims (3)
1. the island detection method of the bilateral reactive power disturbance of intermittence; grid-connected inverting system comprises the single-phase or three-phase grid-connected inverter (1) based on the pulse-length modulation control of HF switch; be used for realizing between inverter and the electrical network transformer (2) of electrical isolation; be used for the relay (3) that inverter is incorporated into the power networks and controls; local load (4); electrical network (5) and be used to produce the inverter bridge drive signal; drive the parallel network reverse controller (10) of the locking signal and the relay control signal that is incorporated into the power networks; the output of combining inverter (1) through isolating transformer (2) back by and network relay (3) be connected with electrical network (5); and the tie point between network relay (3) and the electrical network (5) is point of common coupling (PCC); it is characterized in that grid-connected inverting system also comprises point of common coupling voltage sample module (6); phaselocked loop (7); frequency judge module (8); isolated island protection module (9); Reactive Power Control regulator (11) and intermittent bilateral reactive power disturbing signal (12); intermittent bilateral reactive power disturbing signal (12) is sent periodic disturbing signal and is given Reactive Power Control regulator (11); each disturbance cycle comprises positive disturbing signal; negative disturbing signal and zero disturbing signal; the output signal of Reactive Power Control regulator (11) is defeated by combining inverter (1) through parallel network reverse controller (10); control combining inverter (1) is followed the tracks of the reactive power of intermittent bilateral reactive power disturbing signal (12) output periodic disturbance; each disturbance cycle comprises positive reactive power; negative reactive power and zero reactive power; point of common coupling (PCC) voltage is by point of common coupling voltage sample module (6) sampling back input phaselocked loop (7); the frequency of phaselocked loop (7) output point of common coupling voltage; by frequency judge module (8) frequency values of point of common coupling voltage is judged; if frequency is greater than 50.5Hz or less than 49.5Hz; and continue 10 power frequency periods; then assert electrical network and combining inverter disengagement at this moment; isolated island takes place; isolated island protection module (9) is closed combining inverter (1), and disconnects and network relay (3).
2. the island detection method of the bilateral reactive power disturbance of intermittence according to claim 1 is characterized in that point of common coupling voltage sample module (6) is the voltage sample sensor.
3. the island detection method of the bilateral reactive power disturbance of intermittence according to claim 1 is characterized in that phaselocked loop (7) is integrated phase lock chip CD4046B.
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Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590663A (en) * | 2012-02-02 | 2012-07-18 | 浙江大学 | Improved intermittent reactive power disturbance island detection method |
| CN102611137A (en) * | 2012-03-16 | 2012-07-25 | 北京昆兰新能源技术有限公司 | Three-phase photovoltaic inverter active anti-island method based on reactive power disturbance |
| CN102841279A (en) * | 2012-08-31 | 2012-12-26 | 天津大学 | Micro-grid island detection method |
| CN102879672A (en) * | 2012-07-11 | 2013-01-16 | 中电普瑞科技有限公司 | Bidirectional active power disturbance island detection method |
| CN102998559A (en) * | 2012-11-16 | 2013-03-27 | 华为技术有限公司 | Island detection method and device and electric system |
| CN103064035A (en) * | 2013-01-08 | 2013-04-24 | 天津大学 | Active island detection method of multi-distributed power supply tied-grid |
| CN103091578A (en) * | 2013-01-11 | 2013-05-08 | 天津理工大学 | Island detection method of photovoltaic grid-connected system |
| CN103308806A (en) * | 2013-06-18 | 2013-09-18 | 江苏大学 | Islanding detection method based on fundamental frequency and switching-frequency sub-impedance |
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| CN103713211A (en) * | 2013-11-29 | 2014-04-09 | 江苏兆伏新能源有限公司 | Single-phase and double-phase island detection method and device of three-phase grid-connected inverter |
| CN103762688A (en) * | 2014-01-24 | 2014-04-30 | 湖南大学 | Grid frequency dynamic response device of electric car charging equipment |
| WO2014067187A1 (en) * | 2012-11-05 | 2014-05-08 | 深圳航天科技创新研究院 | Mixed initiative and anti-islanding detection method and system |
| CN104007349A (en) * | 2014-06-11 | 2014-08-27 | 江苏大学 | Fuzzy control island detection method based on wavelet transformation |
| CN104198841A (en) * | 2014-08-08 | 2014-12-10 | 武汉理工大学 | Method for detecting island in photovoltaic grid-connected inverter |
| CN105591371A (en) * | 2016-02-24 | 2016-05-18 | 国网山东省电力公司电力科学研究院 | Anti-islanding protection control system and anti-islanding protection control method based on photovoltaic power station power control system |
| CN105958430A (en) * | 2016-04-27 | 2016-09-21 | 上海电气分布式能源科技有限公司 | Load fixed value switching method and method |
| 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 |
| CN108490295A (en) * | 2018-04-25 | 2018-09-04 | 合肥为民电源有限公司 | A kind of active island detection method and device based on virtually average idle phase demodulation |
| CN110350585A (en) * | 2019-07-26 | 2019-10-18 | 上海电力大学 | The isolated island of grid-connected photovoltaic system detects control method |
| CN110445422A (en) * | 2018-05-02 | 2019-11-12 | 西门子股份公司 | Drive control method, drive system, processing system and storage medium |
| CN110632413A (en) * | 2019-09-02 | 2019-12-31 | 国网吉林省电力有限公司 | Reactive power disturbance island detection method triggered in delayed mode |
| CN116047212A (en) * | 2023-03-27 | 2023-05-02 | 华中科技大学 | Island detection method and device based on reactive power disturbance |
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| CN102590663A (en) * | 2012-02-02 | 2012-07-18 | 浙江大学 | Improved intermittent reactive power disturbance island detection method |
| CN102590663B (en) * | 2012-02-02 | 2013-12-25 | 浙江大学 | Improved intermittent reactive power disturbance island detection method |
| CN102611137A (en) * | 2012-03-16 | 2012-07-25 | 北京昆兰新能源技术有限公司 | Three-phase photovoltaic inverter active anti-island method based on reactive power disturbance |
| CN102611137B (en) * | 2012-03-16 | 2014-11-26 | 北京昆兰新能源技术有限公司 | Three-phase photovoltaic inverter active anti-island method based on reactive power disturbance |
| CN102879672A (en) * | 2012-07-11 | 2013-01-16 | 中电普瑞科技有限公司 | Bidirectional active power disturbance island detection method |
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| CN103308806A (en) * | 2013-06-18 | 2013-09-18 | 江苏大学 | Islanding detection method based on fundamental frequency and switching-frequency sub-impedance |
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Application publication date: 20110817 |