CN202758017U - Anti-islanding test load - Google Patents
Anti-islanding test load Download PDFInfo
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- CN202758017U CN202758017U CN 201220370514 CN201220370514U CN202758017U CN 202758017 U CN202758017 U CN 202758017U CN 201220370514 CN201220370514 CN 201220370514 CN 201220370514 U CN201220370514 U CN 201220370514U CN 202758017 U CN202758017 U CN 202758017U
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Abstract
The utility model relates to an anti-islanding test load, comprising a control chip and a three-phase subcircuit which is controlled and connected by the control chip, has independently controlled three phase load power and can generate a stable fundamental frequency; each phase subcircuit comprises a pure resistive load (R), an inductive load (L) and a capacitive load (C) which are in parallel connection. The anti-islanding test load can automatically and rapidly debugs stable fundamental frequency RLC loads and makes grid-tied inverters to be tested possess anti-islanding effect protection.
Description
Technical field
The utility model relates to experimental test and breadboardin, is specifically related to a kind of anti-isolated island test load for the photovoltaic DC-to-AC converter test.
Background technology
At present, photovoltaic DC-to-AC converter isolated island detection platform, the evaluation that usually is applied to the isolated island effect prevention function of photovoltaic combining inverter detects, and also being applied in also, anti-isolated island test and the evaluation of network source detect.It is the load of resistive/perception/capacitive (RLC) alternating-current measurement that the isolated island effect prevention test needs equipment, and simulation resonance occurs.When resonance occurs, inductance current=capacity current=current in resistance property, Q value=1 (Unite States Standard (USS) Q value was 2.5 originally, now also changed 1 into); During imbalance of three-phase voltage, also accurately fast debugging goes out each phase resonance point.
But because condition restriction, some businessmans of market are used as the RLC load of the aging usefulness of AC power as accurate RLC load and sell.Make some users think that the adjusting stepping amplitude of RLC load is exactly the side accuracy of measurement of instrument, this is wrong.The minimum step amplitude of accommodation of RLC load is 1W, and can not represent measuring accuracy is 1W.The precision of RLC load is also very important in addition; because accurate RLC load price is higher; some users come inverter is prevented the isolated island test with the low RLC load of precision; but ropy RLC load meeting triggers the inverter protection at any time fast; can't stably reach fundamental frequency, so cause inverter to cross underfrequency protection, cause the user to think that inverter isolated island effect prevention defencive function is effective; the result is when actual authentication, and inverter can't pass through.
The basic reason that causes passing through is that the function that anti-isolated island test load will possess has: the one, and it is high that precision is wanted, and loading procedure RLC load value can not drift about; The 2nd, parasitic amount compensate function and remote control function be arranged, otherwise can not realize high efficiency detection; The 3rd, accurate for guaranteeing measurement result, require the harmonic content of RLC load itself to be less than 2%.
The utility model content
The utility model technical issues that need to address are, how a kind of anti-isolated island test load is provided, can be automatically and debug out rapidly the RLC load of stablizing fundamental frequency, and make the tested inverter that is incorporated into the power networks possess the isolated island effect prevention protection.
The utility model technical matters solves like this: make up a kind of anti-isolated island test load, it is characterized in that, what comprise that the threephase load power of control chip and control linkage thereof independently controls can accurately produce a stable fundamental frequency
The three-phase branch road, every phase branch road comprises in parallel pure resistive load, inductive load and capacitive load.
According to the anti-isolated island test load that the utility model provides, every described pure resistive load in mutually is the resistance alloys element.
According to the anti-isolated island test load that the utility model provides, every described inductive load in mutually is to adopt magnetic path type controllable type inductive load element.
According to the anti-isolated island test load that the utility model provides, every described capacitive load in mutually is to adopt magnetic path type controllable type capacitive load element.
According to the anti-isolated island test load that the utility model provides, the components and parts that heat is just being drifted about and the negative drift of heat is cancelled out each other are adopted in every described load in mutually.
According to the anti-isolated island test load that the utility model provides, every phase branch road also comprises the sensor corresponding with described pure resistive load, inductive load and capacitive load that is electrically connected with described control chip.
The anti-isolated island test load that the utility model provides has following advantage than prior art:
But 1, perception, capacitive, resistive load power combination in any, resistive 0.001KW～peak power is adjustable, and perceptual 0.001Kvar～peak power is adjustable, and capacitive 0.001Kvar～peak power is adjustable.Satisfy fine adjustment interchange tuning-points under the imbalance of three-phase voltage condition;
2, for 34 lines mutually, 380V 50Hz and 34 lines mutually, the inverters of two kinds of different output specifications of 480V 60Hz all can accurately easily be debugged tuning-points and occur, and satisfy anti-isolated island and test.Resonance test: perceptual power consumption=capacitive power consumption is set, during resonance in theory perceptual capacitive reactive power cancel out each other, reactive power ≈ 0;
3, can simulate all kinds of complex work environment, detect the synthetic operation performance condition of inverter under various environment.
Description of drawings
Further the utility model is elaborated below in conjunction with the drawings and specific embodiments.
Fig. 1 is the utility model system schematic;
Fig. 2 is the utility model system test figure;
Fig. 3 is the utility model control flow chart.
Embodiment
At first, the utility model basis is described:
The accurate RLC load in the anti-main nucleus equipment of the isolated island detection platform chamber of the utility model, the load of accurate RLC alternating-current measurement is built-in with pure resistive load, inductive load, capacitive load; Threephase load power is independently controlled; Sectional type combination control is adopted in the power input; can combination in any simulate various power loads; satisfy combining inverter load detecting needs, satisfy combining inverter type approval test and delivery test check needs, can effectively detect the anti-island protect function of combining inverter.This platform can accurately be simulated isolated island and be occured, and simulation resonance occurs.
In order to simulate the islet operation environment, need the RLC load can accurately produce a stable fundamental frequency (50Hz or 60Hz), resonant frequency equation
L and C must be balanced, just can reach fundamental frequency.
The idle output that has been bound to of all tested photovoltaic DC-to-AC converters, idle may be capacitive, also may be perception.Key is when implementing the isolated island effect prevention protection test, the inverter output reactive power must auto-compensation in the RLC load debugging, avoid crossing the under-frequency trigger protection in process of the test, cause the measurement result mistake.So must attentional selection one cover can auto-compensation inverter output reactive power the RLC load.
Parasitic amount is on the impact (such as Fig. 2) of test result, so that the anti-isolated island test of inverter is very high to the requirement of RLC load, if the inductive load of experiment is larger than electric capacity, resonance frequency can be greater than 50Hz, and inductive load is less than electric capacity, and resonance frequency can be less than 50Hz, and the components and parts parasitic amount of RLC load is excessive, can cause the resonance frequency deviation, the every deviation 3% of L and C will cause resonance frequency deviation 0.8Hz.When the anti-automatic Protection of isolated island of inverter, must avoid overfrequency or the underfrequency protection of resonance frequency, cause anti-island protect experimental measurement data and measurement result mistake.
In the technique scheme, resistance element type selecting of the present utility model is extremely important, resistance R heating and cause the resistance thermal drift during for fear of long-time test, each branch road all can adopt the components and parts that just drifting about with negative drift, when operating at full capacity for a long time, can cancel out each other because the impedance change that thermal drift causes.
In the technique scheme, the utility model is equipped with intelligence version automatic testing software, satisfies long-range PC and automatically loads test function, the testing procedure of built-in standard and condition.When preventing the isolated island test, only need the input inverter power to get final product, other experimental test work is all finished automatically by software.
In the technique scheme, the control chip model of the utility model control module (in Fig. 3) is STM32F103RBT6.This chip data highway width 32bit, maximum clock frequency 72MHz, I/O terminal number amount 64 able to programme, program storage size 128KB, timer quantity 3*16bit, the flash memory of 32-to-128.
The second, the utility model is described in detail in detail in conjunction with specific embodiments realizes:
(1) specific embodiment one
Shown in accompanying drawing 1, anti-isolated island test load A phase system figure.The resistive loading power of ABC three-phase, perception load power, capacitive loads power and independently shows respectively.Built-in resistive load, inductive load and capacitive load minimum sandards power are 0.001KVA, and load power is adjustable continuously.The power of ABC three-phase resistive load, inductive load and capacitive load can independently be controlled and regulate, and satisfies fine adjustment interchange tuning-points under the Voltage unbalance condition.
(2) specific embodiment two:
Shown in accompanying drawing 2, in the anti-isolated island test load process of the test, when resistance, electric capacity, inductance are tested for a long time, can drift about, produce parasitic amount.Stray inductance appears in resistance, and electric capacity, inductance produce parasitic resistance effect (Fig. 2).The anti-built-in components and parts of isolated island test load, each branch road all can adopt the components and parts that just drifting about with negative drift, when working long hours, can cancel out each other because the impedance change that thermal drift causes.
The utility model resistive load adopts the resistance alloys element, and test process can not change owing to the resistive load element heating causes the resistance value thermal drift; Built-in induct adopts magnetic path type controllable type load elements, satisfies 0.001KVA power adjustments requirement under line voltage 400V/50Hz (phase voltage 230V/50Hz) operating mode, satisfies long time loading process inductive impedance power and can not change; Built-in induct adopts magnetic path type controllable type load inductance load elements, satisfies 0.001KVA power adjustments requirement under the line voltage 400V/50Hz operating mode, satisfies long time loading test process condensance power and can not change.
(3) specific embodiment three:
Shown in accompanying drawing 3, the isolated island test load is taken over control in photovoltaic DC-to-AC converter output, and each distinguishes separate connection ohmic load, inductive load and capacitive load mutually ABC three-phase (Fig. 3 is one phase-A phase only).Resistance sensing module, inductance sensing module and capacitance sensing module are delivered to control module with the feedback signal that obtains respectively.Control module feeds back regulation control switch according to the output load of inverter, and simulation resonance occurs, and can debug accurately district's tuning-points, reaches the photovoltaic DC-to-AC converter test purpose.
In addition, the utility model is equipped with the backstage analysis software, can and regulate the RLC power load in the control of remote computer (PC) software, the host computer control circuit can carry out auto-compensation to the stray inductance of resistive load, dead resistance to the inductive load element is carried out auto-compensation, satisfies accurately to load and detects.
At last, in those of ordinary skills understood scope, in the utility model claim scope, various variations all belonged to protection domain of the present utility model.
Claims (6)
1. an anti-isolated island test load is characterized in that, what comprise that the threephase load power of control chip and control linkage thereof independently controls can accurately produce a stable fundamental frequency
The three-phase branch road, every phase branch road comprises in parallel pure resistive load (R), inductive load (L) and capacitive load (C).
2. described anti-isolated island test load according to claim 1 is characterized in that, every described pure resistive load (R) in mutually is the resistance alloys element.
3. described anti-isolated island test load according to claim 1 is characterized in that, every described inductive load (L) in mutually is to adopt magnetic path type controllable type inductive load element.
4. described anti-isolated island test load according to claim 1 is characterized in that, every described capacitive load (C) in mutually is to adopt magnetic path type controllable type capacitive load element.
5. each described anti-isolated island test load is characterized in that according to claim 1-4, and the components and parts that heat is just being drifted about and the negative drift of heat is cancelled out each other are adopted in every described load in mutually.
6. described anti-isolated island test load according to claim 5 is characterized in that, every phase branch road also comprises the sensor corresponding with described pure resistive load (R), inductive load (L) and capacitive load (C) that is electrically connected with described control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220370514 CN202758017U (en) | 2012-07-30 | 2012-07-30 | Anti-islanding test load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220370514 CN202758017U (en) | 2012-07-30 | 2012-07-30 | Anti-islanding test load |
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| CN202758017U true CN202758017U (en) | 2013-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220370514 Expired - Lifetime CN202758017U (en) | 2012-07-30 | 2012-07-30 | Anti-islanding test load |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995201A (en) * | 2014-05-23 | 2014-08-20 | 国家电网公司 | Wind power generation set islanding test device |
| CN104538971A (en) * | 2014-09-28 | 2015-04-22 | 江苏龙源先锋电气有限公司 | Input current signal device of low-voltage reactive power auto-compensation controller |
| CN105116254A (en) * | 2015-08-26 | 2015-12-02 | 国家电网公司 | Parasitic parameter compensation algorithm for anti-islanding detection system |
| CN110988413A (en) * | 2019-12-17 | 2020-04-10 | 国网江苏省电力有限公司检修分公司 | Matching and control method for high-capacity adjustable simulation RLC test load |
| CN117890698A (en) * | 2023-12-24 | 2024-04-16 | 苏州腾圣技术有限公司 | Island auxiliary test device |
-
2012
- 2012-07-30 CN CN 201220370514 patent/CN202758017U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995201A (en) * | 2014-05-23 | 2014-08-20 | 国家电网公司 | Wind power generation set islanding test device |
| CN103995201B (en) * | 2014-05-23 | 2017-01-11 | 国家电网公司 | Wind power generation set islanding test device |
| CN104538971A (en) * | 2014-09-28 | 2015-04-22 | 江苏龙源先锋电气有限公司 | Input current signal device of low-voltage reactive power auto-compensation controller |
| CN105116254A (en) * | 2015-08-26 | 2015-12-02 | 国家电网公司 | Parasitic parameter compensation algorithm for anti-islanding detection system |
| CN110988413A (en) * | 2019-12-17 | 2020-04-10 | 国网江苏省电力有限公司检修分公司 | Matching and control method for high-capacity adjustable simulation RLC test load |
| CN117890698A (en) * | 2023-12-24 | 2024-04-16 | 苏州腾圣技术有限公司 | Island auxiliary test device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190128 Address after: Room 330, Building A, Baiwang Building, No. 1 South Xili Songbai Road, Nanshan District, Shenzhen City, Guangdong Province, 518000 Patentee after: SHENZHEN QUNZHENG ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: 518000 Sunshine Turning Industrial Zone in Xili Street, Nanshan District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN PARWA TECHNOLOGY Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190325 Address after: 518000 Guangdong, Shenzhen, Nanshan District Xili street, Shahe West Road, Bai Mong village, South 1, A 330, Bai Wang mansion. Patentee after: Shenzhen Huayuan Technology Industry Co.,Ltd. Address before: Room 330, Building A, Baiwang Building, No. 1 South Xili Songbai Road, Nanshan District, Shenzhen City, Guangdong Province, 518000 Patentee before: SHENZHEN QUNZHENG ELECTRONIC TECHNOLOGY Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130227 |