CN205301544U - Photovoltaic inverter voltage rises test system suddenly - Google Patents
Photovoltaic inverter voltage rises test system suddenly Download PDFInfo
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- CN205301544U CN205301544U CN201521030463.9U CN201521030463U CN205301544U CN 205301544 U CN205301544 U CN 205301544U CN 201521030463 U CN201521030463 U CN 201521030463U CN 205301544 U CN205301544 U CN 205301544U
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Abstract
The utility model relates to a photovoltaic inverter voltage rises test system suddenly for the improvement is by the voltage of test equipment's feeder ear, makes to be born the voltage higher than rated voltage by test equipment, including power inlet wire isolation transformer, high voltage circuit breaker K2, adjustable reactor L, high voltage circuit breaker K1, condenser C, controlling resistor R, allot line isolation transformer, power inlet wire isolation transformer and high voltage circuit breaker K2 establish ties, high voltage circuit breaker K2 and reactor L establish ties, reactor L with allot line isolation transformer and establish ties, high voltage circuit breaker K1 and condenser C, controlling resistor R establishes ties, then connect in parallel at reactor L and between by testing arrangement's isolation transformer series connection point, the simulation electric wire netting high voltage process of passing through, the test photovoltaic inverter high voltage ability of passing through, with the help of the cooperation with adjustable reactor and controlling resistor, voltage overshoot and overcurrent when having avoided the condenser to drop into, can realize accurately that photovoltaic inverter voltage rises the test suddenly.
Description
Technical field
This utility model relates to a kind of photovoltaic DC-to-AC converter voltage swells test system, tests for photovoltaic generating system combining inverter voltage swells.
Background technology
In recent years, along with widely using of photovoltaic generating system and being continuously increased of grid-connected installed capacity, its operation when electric network fault and control strategy have directly influenced the safe and stable operation of power system. Existing research focuses primarily upon grid voltage sags fault and the electro-magnetic transient impact analysis of photovoltaic generating system and corresponding low voltage crossing technology is probed into, and the corresponding line voltage correlational study achievement under condition that rises sharply is then still rare. It is true that rising sharply of line voltage often occurs along with the falling fault of line voltage in practical power systems, dash forward to cut etc. such as: the load that grid voltage sags causes and can cause rising sharply of line voltage. Therefore, for off-grid of avoiding photovoltaic generating system after low voltage crossing because of transient state high pressure, it is necessary to its photovoltaic DC-to-AC converter voltage swells control strategy is studied. The decline that photovoltaic generating system combining inverter can be brought to control nargin that rises sharply of line voltage, if out of control, can cause that energy is poured in down a chimney entrance inverter by electrical network and then causes DC side overvoltage or cross stream. Transient state photovoltaic generating system combining inverter caused for improving line voltage to rise sharply is impacted, it is ensured that its safety grid-connection runs, and this article proposes a kind of photovoltaic DC-to-AC converter voltage swells test system.
At present, Chinese market accesses photovoltaic generating system combining inverter and only proposes the index of correlation of low voltage crossing, high voltage crossing wouldn't be required, and inverter that North America market main flow inverter manufacturer releases is most with high voltage crossing function, along with the development of domestic photovoltaic power generation technology and perfect, possesses the development trend that high voltage crossing function will be photovoltaic generating system combining inverter.
Therefore, for ensure large-scale photovoltaic generating access after power system safety and stability run, need badly and carry out photovoltaic DC-to-AC converter voltage swells aptitude tests, developing the test device of true simulating grid voltage swells characteristic to be then the most important thing.Utility model patent " portable wind turbine generator system high-low voltage ride through test device " patent No. is: 201220255118.5, though providing a kind of electrical network high voltage modeling scheme, it realizes the rising of Wind turbines set end voltage by transformer secondary tapping saltus step, but high voltage waveform produced by the method, its voltage increase rate is too fast, and the phase angle in actual electric network overvoltage process and quality of power supply situation of change cannot be simulated, be not suitable for the test request of Wind turbines high voltage capability.
Utility model content
This utility model is for the deficiencies in the prior art, it is provided that a kind of photovoltaic DC-to-AC converter voltage swells test system.
A kind of photovoltaic DC-to-AC converter voltage swells test system, including electric power incoming line isolating transformer, primary cut-out K2, REgulatable reactor L, primary cut-out K1, capacitor C, adjustable resistance R, allot line isolating transformer, described electric power incoming line isolating transformer is connected with primary cut-out K2, primary cut-out K2 connects with reactor L, reactor L connects with allotting line isolating transformer, primary cut-out K1 and capacitor C, adjustable resistance R connects, then it is connected in parallel between the isolating transformer series connection point of reactor L and device being tested, simulating grid high voltage crossing process, test photovoltaic DC-to-AC converter high voltage crossing ability, it is characterized in that, described primary cut-out K1 adopts and both can also divide the chopper or thyristor switch that put into mutually by the chopper that simultaneously puts into of three-phase, capacitor C and adjustable resistance R connects and adopts wye connection, and neutral ground, REgulatable reactor L, capacitor C and adjustable resistance R cooperate, it is achieved improve capacitive reactive power described in the voltage swells of photovoltaic DC-to-AC converter at the induction reactance X of REgulatable reactor LLUpper generation voltage drop, improves photovoltaic DC-to-AC converter voltage; Described induction reactance XLAdopt dry-type air-core reactor, the reactance value X of reactorLResistance R with reactorLRatio XL/RLShould be greater than 10.
The tap of REgulatable reactor L is connected in place before putting into test by described voltage swells test system in advance, and described primary cut-out K1 disconnects, and primary cut-out K2 disconnects; When starting test, first close described primary cut-out K2, then close described primary cut-out K1; When terminating test, first disconnect described primary cut-out K1, then, disconnect described primary cut-out K2.
By arranging different induction reactance XLFrom the voltage swells that resistance R parameter coupling realizes the different amplitude of described photovoltaic DC-to-AC converter, induction reactance XLThe voltage swells waveform making described photovoltaic DC-to-AC converter voltage swells system have 132 kinds of different voltage amplitudes within the scope of 100%Un-150%Un is selected from the parameter of resistance R; Control described vacuum circuit breaker K1 to realize described photovoltaic DC-to-AC converter voltage swells time span is controlled.
Described every phase capacitor is connected with adjustable resistor, by primary cut-out K1, can put into by three-phase, it is achieved three-phase voltage balanced voltage rises sharply simultaneously, and any one phase in three-phase can individually control, it is also possible to realizes imbalance of three-phase voltage voltage swells.
The voltage swells device realizing described high voltage crossing test system includes electric power incoming line transformator, high-tension switch cabinet, reactor cabinet, capacitor panel, resistance bin, photovoltaic DC-to-AC converter transformator; Described reactor is induction reactance XL, described capacitor is capacitive reactance XC, described high-tension switch cabinet is built with primary cut-out K1, primary cut-out K2, described capacitor panel is built with capacitor C, described resistance bin is adjustable resistor R, described primary cut-out K2 chooses general vacuum circuit breaker, described primary cut-out K1 chooses to be had the vacuum circuit breaker that both can simultaneously put into and also can divide and put into vacuum circuit breaker or thyristor switch mutually, described high-tension switch cabinet, capacitor panel, resistance bin dielectric level should 15KV and more than, described resistance bin need to install heat abstractor additional, need to install heat ray filter additional between described resistance bin and high-tension switch cabinet and capacitor panel.
Described voltage swells device serial connection is between tested photovoltaic DC-to-AC converter and electrical network, and simulating grid overvoltage tests described tested photovoltaic DC-to-AC converter voltage swells ability, and described voltage swells device includes REgulatable reactor L induction reactance XL, capacitor C capacitive reactance XC, primary cut-out K1 and primary cut-out K2, described induction reactance XLLine isolating transformer is allotted described in accessing after connecting with described switch K1, described electric power incoming line isolating transformer Secondary Winding adopts star-connection neutral-point solid ground, and described primary cut-out K1 connects with capacitor and resistance R star-connection neutral-point solid ground.
The described photovoltaic DC-to-AC converter high voltage test system that rises sharply also includes TT&C system and remote monitoring system on the spot; TT&C system is connected with described high voltage crossing test system on the spot, and TT&C system and remote monitoring system communicate on the spot; Described TT&C system on the spot, by the information gathering of system, realizes high voltage crossing control after being analyzed judgement, it is possible to voltage swells information is uploaded to the remote monitoring system of outside by network function.
Test philosophy is as follows: �� U drops in the AB both end voltage of REgulatable reactor LAB=(PRL+QXL)/Un, wherein RLFor the resistance of REgulatable reactor L, XL=�� L is the reactance of REgulatable reactor L, and Q is the reactive power by REgulatable reactor L, and P is the active power by REgulatable reactor L, when Q is lagging reactive power, Q be on the occasion of, when Q is capacitive reactive power, Q is negative value, when Q is capacitive reactive power and QXL>PRLTime, �� UAB< 0, namely B point voltage is higher than A point voltage, and so-called voltage raises, and improves the voltage at the junction point place of described photovoltaic DC-to-AC converter, in order to reduce by REgulatable reactor L active power at REgulatable reactor L resistance RLOn voltage drop, generally require XL/RLMore than 10.
Before described voltage swells device puts into test, described primary cut-out K1, K2 disconnect;
When starting test, first close described primary cut-out K2, then close described primary cut-out K1;
When terminating test, first disconnect described primary cut-out K1, be then turned off described primary cut-out K2.
Described electric capacity C is in series with a resistor, adopts wye connection neutral ground;
Described capacitive reactance capacitor XCAnd series resistance R, when primary cut-out K1 three-phase puts into simultaneously, the balance lifting of B point three-phase voltage, when putting into when primary cut-out K1 three-phase difference, B point imbalance of three-phase voltage lifting.
This utility model provides: the voltage being realized described voltage swells device and the different amplitude of described photovoltaic DC-to-AC converter by different induction reactance and different capacitive reactances and resistance R parameter coupling is risen, inductance l values is divided into 22 grades, two grades (normal condition is fixed) of capacitance, resistance R value is divided into 6 grades, different inductance l values to select the high voltage waveform making the junction point voltage of described voltage swells device and described photovoltaic DC-to-AC converter have 132 kinds of different voltage swells within the scope of 100%Un-150%Un from resistance R value;
Described primary cut-out K1 adopts both can put into simultaneously and also can divide the mechanical switch put into mutually or thyristor switch, primary cut-out K2 adopts common mechanical switch, control described primary cut-out K1, K2, it is achieved the high voltage time span of described voltage swells device Yu described tested photovoltaic DC-to-AC converter is controlled.
Described TT&C system on the spot and remote monitoring system are all connected with described voltage swells device; Described TT&C system on the spot gathers the information such as the described voltage swells device voltage with the junction point of photovoltaic DC-to-AC converter and described information is uploaded to the remote monitoring system of outside; Described voltage swells device status signal is sent to described in after control system on the spot, status signal is real-time transmitted to described remote monitoring system by the described system that controls on the spot.
This utility model is for the deficiencies in the prior art, it is provided that a kind of photovoltaic DC-to-AC converter voltage swells test system beneficial effect include:
1, a kind of photovoltaic DC-to-AC converter voltage swells test system that this utility model provides, induction reactance XLAccess after connecting with primary cut-out K2 between tested photovoltaic DC-to-AC converter and electrical network, the junction point place of voltage swells device and tested photovoltaic DC-to-AC converter is by primary cut-out K1 connect and capacitor C and resistance R series connection star-connection neutral-point solid ground, test process realizes according to the disconnection of sequential and Guan Bi by controlling primary cut-out K1 and K2, the voltage swells that test point produces is identical with the mechanism that actual electric network voltage swells produces, speed and voltage waveform quality thereof that voltage rises are all very identical with actual electric network surge characteristic, can truly simulate and produce actual power network overvoltage characteristic, 690V can be realized, the high-voltage state simulation of 10kV and 35kV power system.
2, capacitor C and resistance R connects and adopts wye connection neutral ground, and series resistance can reduce the transient process of capacitor switching immediate current and voltage; Capacitor can provide capacitive reactive power, coordinates induction reactance XLThe voltage of lifting test point. And control K1 three-phase and put into simultaneously or divide the balance lifting of test point voltage three-phase voltage or the uneven lifting that input mutually can make this voltage swells device.
3, different induction reactance value XLDifferent voltage amplitudes can be obtained in test point, induction reactance X in embodiment from resistance R combined effectLThe voltage swells waveform that can have 132 kinds of different voltage amplitudes within the scope of voltage 100%Un-150%Un is selected from the parameter of resistance R.
4, photovoltaic DC-to-AC converter voltage swells tests the remote monitoring system that system also includes being connected externally to, and all information of test system are uploaded to remote monitoring system each through network.
Accompanying drawing explanation
It is illustrated in figure 1 the single line schematic diagram of a kind of photovoltaic DC-to-AC converter voltage swells device that this utility model provides;
It is illustrated in figure 2 the switch motion of a kind of voltage swells device that this utility model provides and the sequential chart of impedance input situation;
It is illustrated in figure 3 capacitive reactance X in a kind of voltage swells device that this utility model providesCBasic Topological figure;
It is illustrated in figure 4 the schematic layout pattern in a kind of voltage swells device practical application that this utility model provides;
A kind of photovoltaic DC-to-AC converter voltage swells test system In-situ test that being illustrated in figure 5 this utility model provides controls schematic diagram;
It is illustrated in figure 6 the actual measurement line voltage real-time waveform figure that a kind of photovoltaic DC-to-AC converter voltage swells test system is three-phase symmetric voltage embodiment when rising sharply that this utility model provides;
It is illustrated in figure 7 the line voltage effective value oscillogram that photovoltaic DC-to-AC converter voltage swells test system is three-phase symmetric voltage embodiment when rising sharply that this utility model provides;
It is illustrated in figure 8 the actual measurement condenser current real-time waveform figure that a kind of photovoltaic DC-to-AC converter voltage swells test system is three-phase symmetric voltage embodiment when rising sharply that this utility model provides;
It is illustrated in figure 9 the actual measurement line voltage real-time waveform figure that a kind of photovoltaic DC-to-AC converter voltage swells test system is embodiment during asymmetrical three-phase voltage swells that this utility model provides.
The line voltage effective value oscillogram that a kind of photovoltaic DC-to-AC converter voltage swells test system is embodiment during asymmetrical three-phase voltage swells provided for this utility model as shown in Figure 10;
The actual measurement condenser current real-time waveform figure that a kind of photovoltaic DC-to-AC converter voltage swells test system is embodiment during asymmetrical three-phase voltage swells provided for this utility model as shown in figure 11.
Detailed description of the invention
Below according to accompanying drawing, detailed description of the invention of the present utility model is described in further detail.
This utility model provides a kind of photovoltaic DC-to-AC converter voltage swells test system, including voltage swells device, the access point of this voltage swells device connects grid side, test point connection is tested allots line transformer high-pressure side, simulating grid overvoltage tests the voltage swells ability of this tested photovoltaic DC-to-AC converter, the single line schematic diagram of this voltage swells device is as shown in Figure 1, as shown in Figure 1, this voltage swells circuit includes described electric power incoming line transformator and connects with REgulatable reactor L, then REgulatable reactor L connects with allotting line isolating transformer, capacitor C is connected in parallel between the isolating transformer series connection point of REgulatable reactor L and device being tested after connecting with adjustable resistance R, after primary cut-out K1 and capacitor C and resistance R connects, neutral-point solid ground.
Test process mesohigh chopper K2 first closes, then primary cut-out K1 Guan Bi, and capacitor provides capacitive reactive power support, and this capacitive reactive power is at induction reactance XLThe voltage drop of upper generation, improves the voltage amplitude of test point, reduces the impact on grid side access point voltage simultaneously.
Further, voltage swells generating means puts in test process, cut-offfing of primary cut-out K1 and primary cut-out K2 need to perform in a certain order, it is illustrated in figure 2 the switch motion of a kind of voltage swells device that this utility model provides and the sequential chart of impedance input situation, as shown in Figure 2, before voltage swells device puts into test, primary cut-out K1 disconnects, primary cut-out K2 disconnects, and now, REgulatable reactor L and capacitor C does not all access in circuit; When starting test, first closed high chopper K2, make reactor L first put in test circuit, then closed high chopper K1, make capacitor CCPutting in test circuit, produce the voltage swells in test process, the time that the voltage swells persistent period is closed by primary cut-out K1 determines, namely the time T1 in figure determines; When terminating test, first disconnect primary cut-out K1, then broken height voltage breaker K2 again. This voltage swells device, can truly simulate and produce actual line voltage and rise sharply characteristic, the voltage swells produced is identical with the mechanism that actual electric network overvoltage produces, speed and voltage waveform quality thereof that voltage rises are all very identical with actual electric network voltage swells characteristic, and this test system can realize the high-voltage state simulation of 690V, 10kV and power system.
The voltage that REgulatable reactor L and capacitor C and resistance R combined effect obtain different voltage amplitude in test point rises, and the amplitude of voltage lifting is by induction reactance value XLTogether decide on the capacitive reactive power of capacitor and resistance R.
REgulatable reactor can adopt dry-type air-core reactor, for meeting the test request that is incorporated into the power networks under condition, reduces the impact on test point voltage magnitude of the photovoltaic DC-to-AC converter active power, it is desirable to the reactance value X of regulative reactanceLResistance value R with REgulatable reactorLRatio XL/RL(XL=�� L) should be the bigger the better (reducing active power to drop at the ohmically electricity of REgulatable reactor), generally should be greater than 10.
Described primary cut-out K1 and capacitor C and resistance R Basic Topological figure is as shown in Figure 3, the three-phase capacitive reactance branch road mode of connection adopts wye connection, neutral-point solid ground, primary cut-out K1 can put into simultaneously or divide and put into mutually, the balance lifting of test point three-phase voltage, or test point imbalance of three-phase voltage lifting.
Every electric capacity C and resistance R series arm, resistance R is for reducing the transient process of capacitor switching immediate current and voltage, and the effect of capacitor C is to provide capacitive reactive power, coordinates the voltage of REgulatable reactor lifting test point, voltage swells process is produced, due to induction reactance X in test point simulationLVoltage lifting effect, the terminal voltage of capacitor C increases, should select the rated voltage of primary cut-out K1, the rated voltage of capacitor, resistance box rated voltage 15kV and more than.
Primary cut-out K2 adopts vacuum circuit breaker, and primary cut-out K1 adopts and both the chopper put into mutually or IGCT also can be divided as switch by the chopper that simultaneously puts into of three-phase.
By different REgulatable reactor induction reactance XLValue with resistance R, it is possible to obtain the line voltage ascensional range of different size in test point, and the impact of test system electrical network access point is reached minimum. For more real simulating grid high voltage processes, its induction reactance XLValue can not be excessive, should ensure that the capacity of short circuit of test point is at least tested unit capacity more than 3 times.
The actual output performance of existing equipment illustrates:
(1) test default is three-phase symmetrical high voltage, and high voltage amplitude setting value is 130%Un, persistent period 200ms. As shown in Figure 6, Fig. 7 is the line voltage effective value in corresponding moment to actual measurement line voltage real-time waveform, and Fig. 8 is the electric current real-time waveform figure of capacitor.
(2) test default is asymmetrical three-phase high voltage, and high voltage amplitude setting value is 116%Un, persistent period 200ms. Actual measurement line voltage real-time waveform is as it is shown in figure 9, line voltage effective value that Figure 10 is the corresponding moment, and Figure 11 is the electric current real-time waveform figure of the capacitor in corresponding moment.
Finally should be noted that: above example is only in order to illustrate that the technical solution of the utility model is not intended to limit, although this utility model being described in detail with reference to above-described embodiment, those of ordinary skill in the field are it is understood that still can modify to detailed description of the invention of the present utility model or equivalent replacement, and without departing from any amendment of this utility model spirit and scope or equivalent replace, it all should be encompassed in the middle of right of the present utility model.
Claims (6)
1. a photovoltaic DC-to-AC converter voltage swells test system, including electric power incoming line isolating transformer, primary cut-out K2, REgulatable reactor L, primary cut-out K1, capacitor C, adjustable resistance R, allot line isolating transformer, described electric power incoming line isolating transformer is connected with primary cut-out K2, primary cut-out K2 connects with reactor L, reactor L connects with allotting line isolating transformer, primary cut-out K1 and capacitor C, adjustable resistance R connects, then it is connected in parallel between the isolating transformer series connection point of reactor L and device being tested, simulating grid high voltage crossing process, test photovoltaic DC-to-AC converter high voltage crossing ability, it is characterized in that, described primary cut-out K1 adopts can the chopper that simultaneously puts into of three-phase or point chopper put into mutually or thyristor switch, capacitor C and adjustable resistance R connects and adopts wye connection, and neutral ground, REgulatable reactor L, capacitor C and adjustable resistance R cooperate, it is achieved improve the capacitive reactive power induction reactance X at REgulatable reactor L of photovoltaic DC-to-AC converter voltage swellsLUpper generation voltage drop, improves photovoltaic DC-to-AC converter voltage; Described induction reactance XLAdopt dry-type air-core reactor, the reactance value X of reactorLResistance R with reactorLRatio XL/RLShould be greater than 10.
2. a kind of photovoltaic DC-to-AC converter voltage swells test system according to claim 1, it is characterized in that, the tap of REgulatable reactor L is connected in place before putting into test by described voltage swells test system in advance, described primary cut-out K1 disconnects, and primary cut-out K2 disconnects; When starting test, first close described primary cut-out K2, then close described primary cut-out K1; When terminating test, first disconnect described primary cut-out K1, then, disconnect described primary cut-out K2.
3. a kind of photovoltaic DC-to-AC converter voltage swells test system according to claim 1, it is characterised in that by arranging different induction reactance XL, capacitor C and resistance R parameter coupling realize the voltage swells of the different amplitude of described photovoltaic DC-to-AC converter, induction reactance XL, capacitor C and the parameter of resistance R select the voltage swells waveform that makes described photovoltaic DC-to-AC converter voltage swells system have 132 kinds of different voltage amplitudes within the scope of 100%Un-150%Un; Control described chopper K1 to realize described photovoltaic DC-to-AC converter voltage swells time span is controlled.
4. a kind of photovoltaic DC-to-AC converter voltage swells test system according to claim 1, it is characterized in that, described electric power incoming line isolating transformer Secondary Winding adopts star-connection neutral-point solid ground, every mutually described capacitor is connected with adjustable resistor, star-connection neutral-point solid ground, by chopper K1, can put into by three-phase simultaneously, realizing three-phase voltage balanced voltage to rise sharply, any one phase in three-phase can individually control, it is also possible to realizes imbalance of three-phase voltage voltage swells.
5. a kind of photovoltaic DC-to-AC converter voltage swells test system according to claim 1, it is characterized in that, it is achieved the voltage swells device of described high voltage crossing test system includes electric power incoming line transformator, high-tension switch cabinet, reactor cabinet, capacitor panel, resistance bin, photovoltaic DC-to-AC converter transformator; Described reactor is induction reactance XL, described capacitor is capacitive reactance XC, described high-tension switch cabinet is built with primary cut-out K1, primary cut-out K2, described capacitor panel is built with capacitor C, described resistance bin is adjustable resistor R, described primary cut-out K2 chooses general vacuum circuit breaker, described primary cut-out K1 chooses to be had the vacuum circuit breaker that both can simultaneously put into and also can divide and put into vacuum circuit breaker or thyristor switch mutually, described high-tension switch cabinet, capacitor panel, resistance bin dielectric level should 15kV and more than, described resistance bin need to install heat abstractor additional, need to install heat ray filter additional between described resistance bin and high-tension switch cabinet and capacitor panel.
6. a kind of photovoltaic DC-to-AC converter voltage swells test system according to claim 5, it is characterised in that described photovoltaic DC-to-AC converter high voltage crossing test system also includes TT&C system and remote monitoring system on the spot; TT&C system is connected with described high voltage crossing test system on the spot, and TT&C system and remote monitoring system communicate on the spot; Described TT&C system on the spot, by the information gathering of system, realizes high voltage crossing control after being analyzed judgement, it is possible to voltage swells information is uploaded to the remote monitoring system of outside by network function.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105388430A (en) * | 2015-12-10 | 2016-03-09 | 鞍山荣泰电力电子有限公司 | Photovoltaic inverter voltage swell test system |
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| CN105388430A (en) * | 2015-12-10 | 2016-03-09 | 鞍山荣泰电力电子有限公司 | Photovoltaic inverter voltage swell test system |
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