CN103941192A - Energy storage power station test load - Google Patents
Energy storage power station test load Download PDFInfo
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Abstract
The invention provides an energy storage power station test load which comprises a transformer, a load module and a master control module. High voltages are input to the transformer, the transformer outputs low voltages to be connected to the load module, and the load module comprises an impedance load array and an inductive impedance load array. The master control module is connected with the load module to control switching of the impedance load array and/or the inductive impedance load array in the load module. According to the characteristics of an actual power grid, the input high voltages are converted to the lower voltages through the transformer and then are connected to the load module in a low-voltage level, the problem of high-voltage energy storage power station testing is completely solved, the overall load module can achieve load capacity in a three-phase unbalanced state, and the requirement for a 10 W minimum regulation stride can be met.
Description
Technical field
The present invention relates to a kind of electric system band and carry testing apparatus, refer in particular to a kind of energy-accumulating power station test load.
Background technology
Along with the development of new forms of energy, for improving the stability of electrical network, electrical network accesses a lot of photovoltaics, wind-powered electricity generation and energy storage device, conventionally in electrical network, be called battery energy storage station (BESS-Battery Energy Storage Station) with energy-storage battery, it refers to taking accumulator as energy carrier, discharge and recharge by energy conversion system, and can realize with electric system the accumulator system of the meritorious of various ways and quadergy exchange.
Known, battery energy storage stands in before formal input operation of power networks, all need its accumulator system performance to test, now just need to use special proving installation---energy-accumulating power station test load (High-power Resistance And Inductive Load), adjustable resistive load, inductive load, the capacitive load of built-in classification in this energy-accumulating power station test load, thus can realize the simulation of load.
But the access point voltage at battery energy storage station mostly is 10KV level in existing electrical network, but alternating-current measurement load in the market all designs by 400V, and what it was mainly considered is the material maturation relatively of load.But, conventionally need to realize uneven loading for battery energy storage station, and load minimum step amplitude (theSmallest Step, refer to from current steady-state adjustment to next stable state, device can single single step loads the minimum capacity value that resistance sense is held power) be 10W, if adopt resistance, inductance, the contactor of 10KV, can have following problem:
1), the resistance of the single-phase resistance of 10W10KV is: 0.000577 Europe, resistance is too little.Material cost is also very high simultaneously.Powerful resistance also needs 33 of the resistance of withstand voltage 300V, and quantity is a lot, while needing series connection to use simultaneously, very high to the coherence request of every resistance in load, the duration of screening is very long, uses and also can have certain risk in the later stage, cause later maintenance workload large, the problems such as investigation difficulty.
2), the contactor of 10KV, do not have low capacity as the minimum of 10W be also 63A be applicable to 50KW power grade, can not meet the requirement of miniwatt fine adjustments completely, its cost is increased simultaneously, whole equipment volume increases relatively.
3), the operations involving high pressure environment of 10KV has higher requirement for site operation personnel's quality, necessarily required high-tension electricity cost, just can realize relevant item test, requires higher to operating personnel.
4) if press 10KV design, be 250mm according to creepage distance between standard regulation 10KV high-pressure electrified conductor, electric clearance is 125mm, if select 10KV design, increase undoubtedly the volume of equipment, it is estimated that equipment size at least increases by 1/3, equipment size is excessive, and takies larger space.The volume of realizing three-phase imbalance load cabinet is just larger.
As can be seen here, need in the industry the energy-accumulating power station test load that a kind of 10KV of meeting electrical network of design uses badly.
Summary of the invention
The object of the invention is to overcome above-mentioned defect, provide a kind of and be converted to low pressure mode and then realize the energy-accumulating power station test load of the grid-connected test in battery energy storage station by high pressure.
The object of the present invention is achieved like this: a kind of energy-accumulating power station test load, and it comprises transformer, load blocks and main control module; Described transformer input high pressure, output low pressure is connected into load blocks; Described load blocks comprises impedance load array, induction reactance load array; Described main control module be connected with load blocks impedance load array in control load module and/or the switching of induction reactance load array.
Beneficial effect of the present invention is the characteristic according to actual electric network, first by being transformed into low pressure through a transformer to the high pressure of input, then be connected to the load blocks of low pressure grade, thereby solve high-voltage energy storage power station test problem completely, not only whole load blocks can realize three-phase imbalance state band and carries, and the minimum requirement of adjusting stride and can reach 10W.Technology entirety merits and demerits adopt the test that is converted to low pressure mode and is realized energy-accumulating power station by high pressure, have taken into account the application of ripe low-voltage load technology simultaneously, lay a good foundation for dilatation later and other performance tests, and the later maintenance cost of whole equipment also reduces greatly.
Brief description of the drawings
Below in conjunction with accompanying drawing in detail concrete structure of the present invention is described in detail
Fig. 1 is system architecture diagram of the present invention;
Fig. 2 is the system architecture diagram of the present invention's one specific embodiment;
Fig. 3 is the system architecture diagram of another specific embodiment of the present invention;
Fig. 4 is the circuit theory diagrams of impedance load array one specific embodiment of load blocks of the present invention.
41-single-phase low-power group; 42-single-phase high-power group; 43-Three-phase high-power group.
Embodiment
This patent by high electrical network distribution process-in-thinking of the transfer process of low distribution applies to energy-accumulating power station test load, changed and take into account ripe low-voltage load technology and realized the application of the test of energy-accumulating power station by high-low pressure.By describing technology contents of the present invention, structural attitude in detail, being realized object and effect, below in conjunction with embodiment and coordinate accompanying drawing 1-3 to be explained in detail.
Refer to Fig. 1, the present invention relates to a kind of energy-accumulating power station test load, it comprises transformer, load blocks and main control module; Described transformer input high pressure, output low pressure is connected into load blocks; Described load blocks comprises impedance load array, induction reactance load array; Described main control module be connected with load blocks impedance load array in control load module and/or the switching of induction reactance load array.
Thus, the present invention is according to the characteristic of actual electric network, first by being transformed into low pressure through a transformer to the high pressure of input, then be connected to the load blocks of low pressure grade, thereby solve high-voltage energy storage power station test problem completely, not only whole load blocks can realize three-phase imbalance state band and carries, and the minimum requirement of adjusting stride and can reach 10W.Technology entirety merits and demerits adopt the test that is converted to low pressure mode and is realized energy-accumulating power station by high pressure, have taken into account the application of ripe low-voltage load technology simultaneously, lay a good foundation for dilatation later and other performance tests, and the later maintenance cost of whole equipment also reduces greatly.
Embodiment mono-:
As shown in Figure 2, energy-accumulating power station test load further comprises electric quantity acquisition module, protection module, working power control module, manipulation and display module and radiating module.Wherein electric quantity acquisition module exports main control module to after accessing respectively low pressure and high pressure collection; Protection module is connected with main control module; Main control module is connected with manipulation and display module; Described working power control module input civil power, its output is connected with main control module and radiating module, is used to main control module power supply and controls according to it radiating module work that drives.
Embodiment bis-:
As shown in Figure 3, further, above-mentioned middle radiating module comprises the fan governor, hot protective relay permutation and the cooling fan permutation that connect successively; Described fan governor is connected with working power control module.
Further, above-mentioned middle electric quantity acquisition module comprises the first electric quantity acquisition unit, the first voltage transformer (VT), the first current transformer, the second electric quantity acquisition unit, second voltage mutual inductor, the second current transformer; Described high pressure accesses the first electric quantity acquisition unit by the first voltage transformer (VT), the first current transformer respectively, the first electric quantity acquisition unit access main control module; Described low pressure accesses the second electric quantity acquisition unit by second voltage mutual inductor, the second current transformer respectively.
Embodiment tri-:
Above-mentioned protection module comprises temperature sensor.Can monitor the working temperature of load blocks, environment temperature by temperature sensor, avoid its overload running.
Embodiment tetra-:
Further, above-mentioned in, the impedance load array of load blocks comprises multichannel impedance branch road, each impedance paper road comprises resistance, contactor and the fuse of series connection; The induction reactance load array of described load blocks comprises multichannel impedance branch road, and each induction reactance branch road comprises inductance, contactor and the fuse of series connection.
Contactor can be devoted oneself to work according to this road resistance of control switching, inductance thus, and fuse can be protected respectively each branch road.
Embodiment five:
In above-mentioned, load blocks also can comprise capacitive reactance load.Can realize LC resonance band and carry, realize anti-isolated island test function.
Embodiment six:
Main control module connects load blocks by middle pilot relay array, and main control module can carry out by middle pilot relay the control of switching to load blocks thus.
Embodiment seven:
As shown in Figure 4, the impedance load array of described load blocks and induction reactance load array comprise single-phase low-power group 41, single-phase high-power group 42 and Three-phase high-power group 43.Impedance load array and induction reactance load array are divided into the benefit of different three groups is that single-phase low-power group can realize that fine tuning, single-phase high-power can realize that three-phase imbalance loads herein and Three-phase high-power is realized high-power loading.
Embodiment eight:
In said structure, described high pressure is not less than 10KV, and described low pressure is not higher than 400V.This programme is particularly suitable for applying in the energy-accumulating power station of 400V electric pressure, 10KV electric pressure thus, and realizing load blocks can carry by three-phase imbalance state band, and the minimum application requirements of adjusting stride and can reach 10W.
Embodiment nine:
In security consideration, equipment enters protection, interface protection, fan protection, inductance surge protection etc. with resistance overheat protector, each loop short-circuit protection, power upper limit protection, overvoltage protection, personnel.
1) load built-in control circuit built-in over-voltage protective plate, exceedes setting value when monitoring voltage, automatic separating load
2) overcurrent protection adopts fuse hardware protection and software to protect with power upper limit, is to stop loading when electric current is greater than preset value.
3) smoke alarm unit is arranged on inductive load top, when monitoring smog alarm, and stops loading and reporting to the police.
4) radiator fan air outlet is installed wind speed detection system, when wind speed is less than protection value, can not load.
5) temperature protective device is arranged in resistance box, when resistance box temperature exceedes 120 degree, reports to the police and shuts down.
6) insulating monitoring is arranged between 10KV PT and casing, monitors insulation lower than thresholding, reports to the police and stops loading.Insulation detects principle: discontinuity is sent voltage signal, detects leakage current and whether exceedes setting.
The concrete example of embodiment bis-:
Electric quantity acquisition module is realized by current transformer PT and Current Transmit high and low pressure side parameter acquisition.In a possibility:
High-pressure side 10kv parameter acquisition adopts PT and the CT of 10KV, and PT adopts 10K/400V no-load voltage ratio, and CT adopts the high precision CT of through type, connects by bronze medal, and precision is 0.2%.
Low-pressure side 400V parameter acquisition, adopts 400V directly to adopt, and CT adopts the no-load voltage ratio of 1000:5, realizes 0-1000A current acquisition, and precision is 0.2%
High and low pressure side is equipped with respectively the electrical parameter analytical table with MC metering mark, the parameters such as the voltage at test two ends, electric current, meritorious, idle, power factor (PF), imbalance of three-phase voltage.
The concrete example of embodiment seven:
This example for be the energy-accumulating power station of 400V electric pressure, 10KV electric pressure, therein:
1, resistive load power is distributed as:
Single-phase: 0.01-0.1KW, 0.1-1KW, 1-10KW, 10-20KW, (A phase, B phase, C distinguish 31.1KW mutually); Three-phase adds up to: 93.3KW
Three-phase: 10KW, 20KW, 30KW, 50KW, 100KW, 200KW;
Amount to: 503.3KW
Can realize the adjusting of minimum 10W stepping, also can realize three-phase imbalance band and carry.
2, the power of inductive load distributes:
Single-phase: 0.01-0.1kVar, 0.1-1kVar, 1-10kVar, 10-20kVar, (A phase, B phase, C distinguish 31.1KVA mutually); Three-phase adds up to: 93.3kVar
Three-phase: 10kVar, 20kVar, 30kVar, 50kVar, 100kVar, 200kVar;
Amount to: 503.3kVar
Can realize the adjusting of minimum 0.01KVar stepping, also can realize three-phase imbalance band and carry, when can realizing isolated island test with capacitive load cooperation, the requirement that three phase resonances regulate.
The power that can increase capacitive load is distributed as: single-phase: 0.01-0.1kVar, 0.1-1kVar, 1-10kVar, 10-20kVar, (A phase, B phase, C distinguish 31.1KVA mutually); Three-phase adds up to: 93.3kVar
Three-phase: 10kVar, 20kVar, 30kVar, 50kVar, 100kVar, 200kVar;
Amount to: 503.3kVar
With regard to this patent, application provides a concrete example below:
This example presses accumulator system as example in south electric network 863 project energy storage problem demonstration project 2MW/10KV, its electric pressure is 10kV, rated power is 2MVA, energy storage system capacity is 2MWh, is mainly made up of accumulator, battery management system (BMS), energy conversion system (PCS), supervisory system etc.Wherein, 2MW/10kV power conversion system (PCS) is taked the topological structure of Cascade H bridge, and primary circuit adopts Y-connection.The existing 4MW/400V low pressure accumulator system that put into operation, electric pressure is 400V, rated power is 4MVA, energy storage system capacity is 16MWh, mainly formed by accumulator, battery management system (BMS), energy conversion system (PCS), supervisory system etc., adopt energy conversion system (PCS) and transformer connected mode to boost to 10KV.Press accumulator system and 4MW/400V low pressure accumulator system to carry out performance test for coordinating in 2MW/10kV, build test platform as the lonely network operation of load access 10KV bus, below the special development energy-accumulating power station test load that meets test request and match with accumulator system interface.
Overall product is by container body, the 400V/10KV transformer of 800KVA, 400V voltage access bronze medal, 10KV accesses row, 400V parameter measurement, 10KV parameter measurement, 503.3KW electric resistance array, 503.3KVA electric inductance array, resistance sense array access ABB contactor group, multifinger contactor control panel, resistance sense array access overcurrent protection fuse, overvoltage, excess temperature, gate inhibitions etc. protect control panel, resistance radiator fan group, inductance radiator fan group, manually control box, remotely controlling computer, control software, the compositions such as system control distribution.
1, structural design: adopt resistive load array and the inductive load array combination of 400V to realize resistance sense power from 0-503.3KW(KVA) adjustable continuously, the transformer that rear end adds 400V/10KV is realized the access of 10KV.
2, carrying case directly adopts 20 chi TEU (Twenty-foot Equivalent Unit)s (i.e. the 6m standard container of customization, external dimensions is: 6058*2438*2591mm), and the anterior double door that adopts of container, facilitates the equipment such as transformer to install.On door, be designed with high voltage line inlet, and high pressure edge lasso is installed, and container rear end is electric resistance array installation site, lower end is designed with the window shutter of three side motor operated switches, the container top that electric resistance array is corresponding is air outlet, and is provided with automatic lifting rain insensitive device.Middle part, side is 400V wiring bronze medal, parameter measurement table, communication interface, control power interface and cat ladder etc.The box house module of container adopts the cabinet type combination of screen, reserved capacitive load position, and transformer is independently installed.
Concrete, laterally install at box house transformer, apart from container both sides 400mm safe distance; Low pressure wiring cabinet is arranged on apart from transformer 580mm position, higher-pressure region and area of low pressure isolate by high-low pressure isolated screen, inductive load is arranged on low-pressure area one side near high-low pressure isolated screen, ohmic load is arranged on area of low pressure one side of heat emission fan top near container afterbody, and reserved electric capacity installation site, inductive load top, by the holding position that adds of reserved capacitive load, make product can escalate into easily RLC load future, the anti-isolated island test that is applied to energy-accumulating power station detects.In addition, equipment with warning lamp, can be pointed out energising, operation, three kinds of states of fault at container afterbody.The design of casing line is: high-tension cable wire inlet-outlet and high-tension cable protective jacket, and high-voltage connection adopts porcelain knob insulation, and 400V specification is pressed in low-pressure side insulation.Earth point comprises: high-tension cable crust earthing bar, and container contact, 400V outlet earth point row, device interior earth point links together.
3, the mode of connection: 400V input end adopts wye connection, three-phase four-wire system, 10KV input end adopt angle type connection, three-phase three-wire system, connector lug, 400V adopts the side bronze medal of windowing to connect, and 10KV adopts collection dress door opening, configuration high-voltage cable insulating circle, enter container, be connected to transformer bronze medal.
4, power designs: the power band that meets 500KW energy-accumulating power station carries, designs resistive 503.3KW, perceptual 503.3KVA, and applied power is 711.67KVA, and the power of 10KV transformer is 800KVA.
This transformer need to meet the duty of peak power, and the peak power becoming of boosting is 711.77KVA, considers volume and surplus, selects the transformer of the 10KV/400V of 800KVA, and for tackling different electric pressures, surplus arranges three voltages and adjusts gears.
5, parameter measurement: 400V terminal voltage, electric current, meritorious, idle, power factor (PF) etc., 10KV terminal voltage, electric current, meritorious, idle, power factor (PF), loading parameters can show, manually on control box screen, shows in gauge outfit, remote computer shows.
6, control mode: the various ways such as remote computer control (computer control is divided into manual loading and preset curve loads), local control box control (hand switch control, computer control).
7, the control of equipment and operation power acquisition 220V/50Hz.
Above-mentioned design reference to standard:
1) GB/T191 packaging--pictorial marking for handling of goods
2) GB/T2423.1 electric and electronic product Essential Environment testing regulations test A: low-temperature test method (GB/T2423.1-2001, idt IEC60068-2-1:1990)
3) GB/T2423.2 electric and electronic product Essential Environment testing regulations test B: hot test method (GB/T2423.2-2001, idt IEC60068-2-2:1974)
4) GB/T2423.3 electric and electronic product environmental test part 2 test method test Cab: steady-state damp heat test
5) GB/T2423.10 electric and electronic product Essential Environment testing regulations test Fc: vibration (sine)
6) GB4208 shell protection grade (IP code)
7) GBT1094.2-1996 power transformer part 2 temperature rise
8) GB6450-86 dry-type power transformer
9) GB/T4365-2003 electrotechnical terminology electromagnetic compatibility
10) GB/T17626.2 EMC test and the test of measuring technique esd immunity
11) GB/T17626.3 EMC test and measuring technique radio frequency electromagnetic field radiation immunity experiment
12) GB/T17626.4 EMC test and measuring technique electrical fast transient (eft) immunity experiment
13) GB/T17626.5 EMC test and measuring technique surge (impact) immunity experiment
14) the conduction interference immunity to interference of GB/T17626.6 EMC test and the induction of measuring technique radio-frequency field
15) immunity experiment of GB/T17626.11 EMC test and measuring technique voltage dip, in short-term interruption and change in voltage
16) emission standard in GB17799.3 Electromagnetic Compatibility General standard inhabitation, business and light industry environment
17) emission standard in GB17799.4 Electromagnetic Compatibility General standard industry environment
18) GB/T13384-2008 electronic product is packed general technical conditions
19) GB/T14436 industrial products ensure file general provisions
20) overvoltage protection of DL/T620-1997 alternating-current electric device and Insulation Coordination
21) the military engine load general specification of GJB2815-97
22) the military interchange moving load of GJB235A-97 general specification
23) GJB235-87 work, intermediate frequency moving load general technical specifications
24) Q/GDW676-2011 accumulator system access power distribution network test specification.
Summary:
The art of this patent is according to the characteristic of actual electric network, used for reference electrical network distribution process and be all through too high-in-transfer process of low distribution, finally convert the thinking of civil power to, also adopt the test that is converted to low pressure mode and realizes energy-accumulating power station by high pressure in the design of this energy-accumulating power station test load.Propose especially for adopting load to design by low pressure 400V electric pressure.Energy-accumulating power station 10KV high pressure, first by being transformed into 400V low pressure through the transformer of a 800KVA, is then connected to 400V electric pressure load cabinet.All kinds of problems in background technology are overcome by the present invention program's design, solve 10KV energy-accumulating power station test problem completely, and whole equipment size can be controlled in 6m container completely, and can realize three-phase imbalance state band and carry, minimumly adjust the requirements such as stride 10W.With the input port of 400V and 10KV, two voltages can directly access simultaneously.Relatively also comparative maturity of low-voltage load technology, lays a good foundation for later dilatation and other performance tests, and the later maintenance cost of whole equipment also reduces greatly.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes instructions of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. an energy-accumulating power station test load, is characterized in that: it comprises transformer, load blocks and main control module; Described transformer input high pressure, output low pressure is connected into load blocks; Described load blocks comprises impedance load array, induction reactance load array; Described main control module be connected with load blocks impedance load array in control load module and/or the switching of induction reactance load array.
2. energy-accumulating power station test load as claimed in claim 1, is characterized in that: it also comprises electric quantity acquisition module, protection module, working power control module, manipulation and display module and radiating module; Wherein electric quantity acquisition module exports main control module to after accessing respectively low pressure and high pressure collection; Protection module is connected with main control module; Main control module is connected with manipulation and display module; Described working power control module input civil power, its output is connected with main control module and radiating module, is used to main control module power supply and controls according to it radiating module work that drives.
3. energy-accumulating power station test load as claimed in claim 2, is characterized in that: described radiating module comprises the fan governor, hot protective relay permutation and the cooling fan permutation that connect successively; Described fan governor is connected with working power control module.
4. energy-accumulating power station test load as claimed in claim 2, is characterized in that: described electric quantity acquisition module comprises the first electric quantity acquisition unit, the first voltage transformer (VT), the first current transformer, the second electric quantity acquisition unit, second voltage mutual inductor, the second current transformer; Described high pressure accesses the first electric quantity acquisition unit by the first voltage transformer (VT), the first current transformer respectively, the first electric quantity acquisition unit access main control module; Described low pressure accesses the second electric quantity acquisition unit by second voltage mutual inductor, the second current transformer respectively.
5. energy-accumulating power station test load as claimed in claim 2, is characterized in that: described protection module comprises temperature sensor.
6. energy-accumulating power station test load as claimed in claim 1, is characterized in that: the impedance load array of described load blocks comprises multichannel impedance branch road, and each impedance paper road comprises resistance, contactor and the fuse of series connection; The induction reactance load array of described load blocks comprises multichannel impedance branch road, and each induction reactance branch road comprises inductance, contactor and the fuse of series connection.
7. energy-accumulating power station test load as claimed in claim 1, is characterized in that: described load blocks also comprises capacitive reactance load.
8. energy-accumulating power station test load as claimed in claim 1, is characterized in that: described main control module connects load blocks by middle pilot relay array.
9. energy-accumulating power station test load as claimed in claim 1, is characterized in that: the impedance load array of described load blocks and induction reactance load array comprise single-phase low-power group, single-phase high-power group and Three-phase high-power group.
10. energy-accumulating power station test load as claimed in claim 1, is characterized in that: described high pressure is not less than 10KV, described low pressure is not higher than 400V.
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| CN109613331A (en) * | 2018-12-19 | 2019-04-12 | 广东电网有限责任公司 | A kind of alternating current charging stake detection load and method based on double load arrays |
| CN109613331B (en) * | 2018-12-19 | 2020-11-24 | 广东电网有限责任公司 | Load detection method and method for alternating current charging pile based on double-load array |
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Denomination of invention: Test load of energy storage plant Effective date of registration: 20230327 Granted publication date: 20170201 Pledgee: Beijing Yizhuang International Financing Guarantee Co.,Ltd. Pledgor: BEIJING QUNLING ENERGY RESOURCES TECHNOLOGY CO.,LTD. Registration number: Y2023980036371 |