CN203519736U

CN203519736U - Photovoltaic inverter testing platform

Info

Publication number: CN203519736U
Application number: CN201320457777.1U
Authority: CN
Inventors: 郭叙胜
Original assignee: Guodian Longyuan Electrical Co Ltd
Current assignee: Guodian Longyuan Electrical Co Ltd
Priority date: 2013-07-30
Filing date: 2013-07-30
Publication date: 2014-04-02
Anticipated expiration: 2023-07-30

Abstract

The utility model relates to a photovoltaic inverter testing platform, which comprises a DC power supply used for simulating the light intensity, an AC power supply used for simulating a power grid environment, and an anti-islanding load, wherein the DC power supply, a tested photovoltaic inverter, the anti-islanding load and the AC power supply are sequentially arranged to form a loop capable of being closed. The photovoltaic inverter testing platform is low in investment and risk, and can meet requirements of power testing.

Description

Photovoltaic DC-to-AC converter test platform

Technical field

The utility model relates to a kind of photovoltaic DC-to-AC converter test platform, particularly a kind of test platform of 500kW photovoltaic DC-to-AC converter, and it comprises performance test and power test, all applicable for the photovoltaic DC-to-AC converter below 630kW.

Background technology

Along with the development of Power Electronic Technique and country are to the great attention of clean energy resource with vigorously support, solar electrical energy generation development rapidly, photovoltaic generation share also improves just year by year, photovoltaic DC-to-AC converter converts the energy conversion of electric energy to as sun power, be transitioned into independent research and production gradually by foreign capital affiliate's monopolization.

On international market, mainly contain the capacity specifications such as 10kW, 20kW, 30kW, 60kW, 100kW, 250kW, 500kW, 1000kW at present.Domestic owing to limited by illumination condition, mainly concentrate on the illumination resources such as Inner Mongol, Qinghai-Tibet compared with the highlands of horn of plenty, what mainly build is centralized power station, capacity is substantially all at 250kW, 500kW, 1000kW; External main capacity is lower than 100kW.

In the process of inverter independent research and production, the test job important step that is absolutely necessary.Performance test is that the design of doing early stage carries out an acceptance inspection and assesses on the one hand, on the other hand for next step production work provides guidance, plays the effect of forming a connecting link.Need inverter to carry out factory testing, for user provides qualified product simultaneously.In test process, performance test guarantees that the inverter dispatching from the factory possesses the desired property indices of standard and protection requirement.And power test belongs to the project that difficulty is large, importance degree is higher.Because in full power, the situation occurrence probabilities such as high temperature, overvoltage, overcurrent can increase, and device and complete machine are had to suitable test, therefore need one independently platform photovoltaic DC-to-AC converter is carried out to burn-in test.

Conventional full power test platform need to have direct supply, AC power more than 500kVA and anti-island load more than 500k more than 500kW.In this test platform, the equipment such as direct supply, AC power and anti-island load are up to a million easily, or millions of, for enterprise, have larger financial pressure.And in power test, can only do full power test to 1 inverter at every turn, efficiency is lower.

Utility model content

Therefore, need a kind of test platform, can meet the requirement of performance test, can to inverter, carry out full power test efficiently again, invest littlely simultaneously, risk is low.

For realizing above object, the purpose of this utility model is to provide a kind of platform that meets photovoltaic DC-to-AC converter performance test and power test, and its investment is little, and risk is low, and can meet full power testing requirement.

The utility model can be realized by following proposal:

A photovoltaic DC-to-AC converter test platform, wherein, described test platform comprises for the direct supply of illumination simulation intensity, for AC power and the anti-island load of simulating grid environment,

Described direct supply, tested photovoltaic DC-to-AC converter, described anti-island load, described AC power is arranged successively and form can be closed loop,

Described test platform comprises the first tested inverter, the second tested inverter and isolating transformer, described the first tested inverter, described isolating transformer, described the second tested inverter arrange successively and form can be closed loop.

Preferably, described test platform comprises the 270V/270V transformer for isolating, and capacity is 1000kVA.

Preferably, described test platform adopts and back-to-back the mode of dragging is carried out to burn-in test to 2 inverters simultaneously.

Preferably, described test platform comprises 120kW direct supply and 300kVA AC power.

Preferably, described anti-island load capacity is 250k.

Preferably, described test platform also comprises the switch cubicle switching for test event.

Test platform investment of the present utility model is little, and risk is low, can meet full power testing requirement.

Accompanying drawing explanation

Fig. 1 is according to the schematic diagram of the photovoltaic DC-to-AC converter test platform of an embodiment of the present utility model.

Shown in Fig. 2 according to the low-voltage tolerance requirement of the high-voltage inverter of an example.

Embodiment

In the utility model, Testing Platform 100 and power test platform 200 are united two into one by switch cubicle, in actual test process by Fig. 1 in the break-make of each switch switched the test event of regulation, convenient and swift, safe reliability is high.

Below with reference to Fig. 1-2, by instantiation, principle of the present utility model and embodiment are described, the low-voltage of take tolerance and continuous working are tested as example and are described.

In Fig. 1 to Fig. 2:

100 Testing Platforms (functional test platform)

200 power test platforms

10 AC power (electrical network simulator)

20 anti-isolated island test loads

30 PV simulators

40 tested photovoltaic DC-to-AC converters

QF1 to QF10, KM1 switch

U _l0the minimum voltage limit value of normal operation

U _l1the lower voltage limit that needs tolerance

T1 voltage drops into U _l1time need to keep the grid-connected time

T2 voltage drops into U _l0time need to keep the grid-connected time.

Wherein, U _l1, the definite of T1, T2 numerical value need to consider the actual conditions such as protection and reclosing actuation time.

By QF8, realize the separated of Testing Platform 100 and power test platform 200.

1. low-voltage tolerance

1.1 standard-required

The mesohigh type inverter that is applicable to large-sized photovoltaic power station should possess the ability of certain tolerance abnormal voltage, avoids departing from when line voltage is abnormal, causes the unstable of electric network source.

When grid-connected point voltage is in Fig. 2 in voltage profile line and above region time, such inverter must guarantee to be uninterruptedly incorporated into the power networks; Grid-connected point voltage when in Fig. 2, voltage profile line is following, allows to stop to power network line power transmission.

Actual limit value should be set according to the relevant art code requirement of access electrical network competent authorities.

Standard regulation: press single-phase, two-phase, three-phase, underloading, heavy duty, 20%, 40%, 60%, 80%, the combination such as 90%, each test point is done 2 times, according to low voltage crossing curve, in all test points, the equal off-grid not of tested inverter, is considered as testing and passes through.

1.2 testing apparatus

Oscillograph, AC power, power analyzer, RLC load;

1.3 method of testing

Utilize the DC side of AC power 10 as the direct current input of inverter, according to Fig. 1 platform, carry out wiring, regulate each device parameter to make grid-connected inverters operation;

According to the requirement of low voltage crossing, in AC power 10, programme, make simulating grid voltage according to Fig. 2 curvilinear motion; By oscillograph, observe the output of inverter, should meet the requirement of low pressure tolerance.

1.4 testing procedure

The control power switch of A, closed RLC load 20, load is transferred to pure resistive, a little more than direct supply rated power, and closed KM1;

The control power switch of B, closed AC power (electrical network simulator) 10, arranges low voltage crossing pattern, and closed QF7;

C, closed QF4 and QF6, the VD of closed AC power 10 is selected button QF3;

D, when direct current input 520V being detected, tested inverter opens machine, limits its output power and is less than 300kW;

E, reach after grid-connected condition the grid-connected contactor of closed inverter, the low pattern of wearing that operation sets;

F, record the tested inverter state of each test point.

2. continuous working test

By building back-to-back, to dragging the object of test platform, be for doing the power test after tested inverter performance test, being mainly used to do aging test, require inverter to move 72 hours continuously under rated power, in operational process, without abnormal occurrence, occur.

To the method for testing of dragging, can test two inverters simultaneously, do not affect again the use of Testing Platform, improve integrated testability efficiency.

In this test, need the output of inverter to be set in rated power, the tested inverter of using when rectification need to be set in direct current output between 500～600V, guarantees that tested inverter DC/AC can work under rated power.

As shown in Figure 1, closed QF4, QF5, QF8 realize power test to connection layout, the internal switch that QF9 and QF10 are inverter.

Starting process:

A, closed QF4, QF5, QF8, QF9, when inverter, 1 output DC reaches between 500～600V, closed QF10, starting DC/AC inverter;

B, after DC/AC inverter output is normal, the grid-connected contactor in closed inverter 1;

C, adjusting inverter 1 and inverter 2, make its output power reach respectively 500kW.

Above with reference to accompanying drawing, preferred implementation of the present utility model has been described, still, has should be appreciated that above-mentioned explanation is only exemplary.Those skilled in the art can, not departing under the prerequisite of spirit and scope of the present utility model, make various modifications and variations to the utility model.Protection domain of the present utility model is limited by the accompanying claims.

Claims

1. a photovoltaic DC-to-AC converter test platform, is characterized in that, described test platform comprises for the direct supply of illumination simulation intensity, for AC power and the anti-island load of simulating grid environment,

Described test platform also comprises the first tested inverter, the second tested inverter and isolating transformer, described the first tested inverter, described isolating transformer, described the second tested inverter arrange successively and form can be closed loop.

2. test platform according to claim 1, is characterized in that, described test platform comprises the 270V/270V transformer for isolating, and capacity is 1000kVA.

3. test platform according to claim 1 and 2, is characterized in that, described test platform adopts and back-to-back the mode of dragging carried out to burn-in test to 2 inverters simultaneously.

4. test platform according to claim 1 and 2, is characterized in that, described test platform comprises 120kW direct supply and 300kVA AC power.

5. test platform according to claim 1 and 2, is characterized in that, described anti-island load capacity is 250k.

6. test platform according to claim 1 and 2, is characterized in that, described test platform also comprises the switch cubicle switching for test event.