CN106291207A - A kind of chain type SVG module test system, platform and method - Google Patents

Abstract

The present invention relates to a kind of chain type SVG module test system, platform and method, test system includes test platform and at least two SVG module, and test platform includes control circuit part and main circuit part.The electric pressure of this test system is low, simple to operate, and system loss is little, it is not necessary to chain type SVG complete machine H bridge runs simultaneously, only needs two H bridges to dragging operation, can test, and will not be the most idle with electrical network exchange.

Description

A kind of chain type SVG module test system, platform and method

Technical field

The present invention relates to a kind of chain type SVG module test system, platform and method, belong to power electronics measuring technology neck Territory.

Background technology

In recent years, along with the development of alternating current-direct current electrical power trans mission/distribution system, the power system voltage to electrical network and the stability of frequency Requiring more and more higher, wherein reactive-load compensation equipment has obtained more being widely applied in terms of ensureing system stability.SVG (Static Var Generator, static reacance generator) is shunt compensation equipment important in FACTS family, to strengthening electricity The stability of pressure, raising power transmission efficiency serve the most crucial effect with quality of power supply aspect.

Along with the application of SVG, chain H bridge structure have also been obtained increasing utilization.SVG is equivalent to voltage-type inversion Device because when chain type SVG normally works be by the break-make of power semiconductor switches DC voltage is converted into AC with The output voltage of electrical network same frequency, just as a voltage source inverter, what only the output of its AC connect is, and electrical network is not nothing Source loads.Its operation principle is: three-phase H bridge change of current chain warp reactor is parallel to electrical network common port, by meritorious, reactive current Carry out uneoupled control, it is achieved capacitive, the quick compensation that perception is idle.

Due to the topological structure of single-phase employing multistage H bridge module series connection, for chain type SVG of 10kV, 35kV electric pressure, Its H bridge module number reaches dozens or even hundreds of, and this gives certain being stranded that the test especially temperature rise test of H bridge module brings Difficult.If using SVG complete machine directly to test the temperature rise of H bridge module, factory is needed to provide the high voltage environment of 10kV, 35kV, also Can be substantial amounts of idle with electrical network exchange, this will cause the voltage pulsation of electric power system, have a strong impact on the quality of power supply of system power supply. Therefore, it is necessary to design the H bridge low voltage experiment platform of a kind of simple in construction, it is possible to carry out the long-time fortune of rated voltage, electric current OK, to test temperature rise and the heat condition of switching device.

Summary of the invention

It is an object of the invention to provide a kind of chain type SVG module test system, platform, method, be used for solving test voltage The problem that high and electrical network exchanges a large amount of reactive powers.

For solving above-mentioned technical problem, the present invention proposes a kind of chain type SVG module test system, including: test platform and At least two SVG module, at least one of which SVG module is module to be measured；Described test platform include control circuit part and Main circuit part, wherein main circuit part includes the DC line for connecting SVG module DC side and DC support electric capacity, with And for connecting the alternating current circuit of SVG module AC, alternating current circuit connects AC network by transformator；Control circuit part For controlling main circuit part and described SVG module.

As the further improvement of this test system, the former limit of described transformator is additionally provided with pre-charge circuit.

As the further improvement of this test system, the alternating current circuit connecting described transformer secondary is provided with inductance.

As the further improvement of this test system, described test system also includes that the temperature rise for measuring SVG module is surveyed Electricity testing device.

For solving above-mentioned technical problem, the present invention also proposes a kind of chain type SVG module test platform, it is characterised in that bag Include: control circuit part and main circuit part；Main circuit part for being connected formation loop, main electricity with at least two SVG module Road part includes the DC line for connecting SVG module DC side and DC support electric capacity, and is used for connecting the friendship of SVG module The alternating current circuit of stream side, alternating current circuit connects AC network by transformator；Control circuit part is used for controlling main circuit part With described SVG module.

As the further improvement of this test platform, the former limit of described transformator is additionally provided with pre-charge circuit.

As the further improvement of this test platform, the alternating current circuit connecting described transformer secondary is provided with inductance.

For solving above-mentioned technical problem, the present invention also proposes the method for testing of a kind of chain type SVG module test system, including Following steps:

For forming two SVG modules of loop, one of them SVG module is DC voltage control, another SVG module For electric current control, and the referenced reactive current controlling two SVG modules is contrary.

The invention has the beneficial effects as follows: the chain type SVG module test system that the present invention proposes, this circuit system structure letter Single, the SVG module number participating in test is little, it is achieved electric pressure low, it is not necessary to factory provides the high voltage of 10kV, 35kV Environment, can be achieved with the rated voltage of SVG module, electric current operation, and participates in presenting dragging operation shape mutually between the SVG module of test Become loop, will not be the most idle with electrical network exchange, it is ensured that the voltage stabilization of power system.

Said system may be used for temperature rise test, tests temperature and the heat condition of declared working condition lower module switching device, And whether inspection device itself can meet the area requirement of maximum temperature, it is also possible to for other test events of SVG module.

Accompanying drawing explanation

Fig. 1 is the major loop topology diagram that the present invention tests device；

Fig. 2 is the control chassis structure chart that the present invention tests device；

Fig. 3 is that module control algolithm schematic diagram tested by H bridge of the present invention.

Detailed description of the invention

Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is further described.

The embodiment of a kind of chain type SVG module of present invention test system, as a example by temperature rise is tested.

A kind of chain type SVG module temperature rise test system of the present invention, including: device for testing temperature rise, test platform and two SVG module, SVG module is H bridge construction, H1 module as shown in Figure 1 and H2 module, and wherein H1 module is module to be measured, H2 For accompanying survey module；Test platform includes control circuit part and main circuit part, and main circuit part includes isolation transformator, straight Flow Line, alternating current circuit, this main circuit part connects H1 module, H2 module forms loop, i.e. H1 module and the direct current of H2 module Side is connected in parallel by DC capacitor C.The former limit of transformator connects electrical network, and the secondary of transformator connects H1 mould by alternating current circuit Block and the AC of H2 module, and alternating current circuit is provided with inductance L1, inductance L2, inductance L3, inductance L4, with stable line electricity Stream.

The feature of this system is, two SVG modules form loop to dragging operation, and AC network has only to provide run and damages Consumption, can be achieved with between SVG module idle is exchanged with each other, and solves to exchange a large amount of reactive power problems with electrical network.

And the H1 in above-described embodiment be module to be measured, H2 for accompanying survey module, as other embodiments, two H bridge moulds Block can be that module to be measured is used in test system, especially temperature rise test system.

The test module of above-described embodiment is presenting dragging mutually of the SVG module of two H bridge constructions, and actually test module is also Can expand to 4 SVG modules, cascade two-by-two in 4 SVG modules, two pairs of SVG DC sides after cascade pass through unidirectional current Holding C to be connected in parallel, AC is used for connecting main circuit part.It is, of course, also possible to expand to more SVG module, test module As long as rated voltage is in factory allows the voltage range provided.

Do not impacted by big electric current for protection test system, precharge electricity can also be set on the former limit of transformator or secondary Road: as it is shown in figure 1, pre-charge circuit includes main branch and precharge branch, main branch is switch KM, and precharge branch includes out Close K1 and current-limiting resistance R.

The present invention tests the control circuit of system, as in figure 2 it is shown, include: master control borad, signal sampling plate, electrically open into opening Ejecting plate and power panel.Wherein, master control borad is mainly made up of DSP, FPGA and ARM, and DSP is responsible for the logic of test fixture, controls, protects The function such as protecting, and FPGA assigns parameter, FPGA is responsible for mould and enters the functions such as signal processing, input and output process, logical AND communication Processing, and drive plate to issue pwm pulse lower floor, ARM is then responsible for communicating with PC host computer.

The sampling plate of control circuit is responsible for receiving current Hall, the analog quantity voltage signal of voltage Hall output, filters Ripples etc. process, and the signal converting thereof into proper range is input to A/D chip, thus analog quantity is converted into digital quantity.

The input of the input and output plate major control switching signal of control circuit and output.Input signal is for representing catalyst Guan Bi, the low and high level of disconnection etc., after level is carried out corresponding stabilization process, be input to panel.Defeated by panel Go out low and high level, control to output auxiliary reclay, operate the Guan Bi of external contactor etc., disconnection.

The power panel of control circuit, exports stable DC 24V voltage, provides DC source, voltage for whole control circuit Fluctuation is within 5% scope.

About the particular circuit configurations of control circuit part, the mainly control to SVG, this belongs to the model of prior art Farmland, therefore the most too much introduce.

When testing, first carry out building of major loop, according to rated voltage, the electricity of H bridge module DC voltage to be measured Flowmeter calculates the parameters such as suitable transformator, catalyst, balance inductance, cable, completes building of platform.

By closing contactor, set up soft loop of H1 module to be measured, the DC capacitor of H1 module side is charged.

As it is shown on figure 3, after soft completed, control circuit gathers the phase place of transformer alternating side voltage, H1 module uses DC voltage outer shroud, the double circle controling mode of current inner loop run.

After completing the two close cycles operation of H1 module, H2 module uses electric current list operation with closed ring, regulates referenced reactive current, can Run on perception, capacitive operating mode.

According to the Feature Description of switching device, determine that device operation under rated current reaches the time of equilibrium temperature, The switching device temperature of device for testing temperature rise record H1 module rises to the temperature rise change procedure of maximum temperature.

Below as a example by 10kV SVG, it is specifically described the test platform embodiment of H bridge module.

1, major loop parameter calculates

The rated direct voltage U of single H bridge module_dc=1000V, rated current I_e=800A.

By calculating, choose the isolating transformer of transformator 690V/690V, the modulation algorithm requirement of SPWM can be met.2 The loss of H bridge power model is taken as 16kW, adds the loss of reactor, it is contemplated that surplus and voltage pulsation problem, and considers straight The internal resistance in stream source, the capacity of transformator is at least 60kW.The then isolating transformer of final choice 690V/690V 500kVA.

Catalyst KM selects ABB model to be the catalyst of AF750-30-11, uses parallel three phase, it is possible to meet 800A electricity Stream protection requirement.

Ripple current is designed as 10%, then ripple current peak-to-peak value I_ripple=0.2 × 800 × 1.414=226A, switch Frequency is 1000Hz, obtains:

$L\≥\frac{U_{dc}}{8\·f_{switch}\·I_{ripple}}=\frac{1000}{8\×2000\×226}=276uH$

Wherein, U_dcFor DC bus-bar voltage, f_switchFor switching frequency.

Then take L₁=L₂=L₃=L₄=150uH.

2, test system control method

Gather the public direct-flow bus wire voltage U of H bridge_dc, output electric current I_h, transformer voltage, have employed DSP and carry out A/D and adopt Sample is changed, and sample frequency is 10kHz.

AC transformer voltage is carried out phase-locked, it is thus achieved that phase place.

H1 main die trial block uses DC voltage control, and concrete, H1 main die trial block can be double-closed-loop control, and outer shroud uses Voltage instruction U_{dc_ref}, virtual voltage U_dcThrough pi regulator be calculated watt current instruction, the referenced reactive current of H1 module with The referenced reactive current of H2 module is contrary；Current-order is tracked controlling by internal ring so that output electric current I_hTrace command, fortune Calculating and all perform in the interruption of DSP, interruption frequency is 2000Hz.

H2 accompanies die trial block to use electric current to control, and concrete, H2 accompanies die trial block can be electric current list closed loop control, given sense Property, capacitive internal ring referenced reactive current so that output electric current I_hTrace command, computing all performs in the interruption of DSP.

Obtain controlling the pulse needed for power switch by using SPWM modulation.

Dragging operation is tested system by designing a kind of simple and reliable H bridge module by the present invention, it is achieved the specified electricity of module Pressure, electric current run, it is not necessary to chain type SVG complete machine H bridge runs simultaneously, can carry out H bridge temperature rise data easily, before H bridge Phase hardware designs has great importance, saves design time and expense.

It addition, the chain type SVG module test platform of the present invention and method are based on chain type SVG mould described in above example The test platform of block test system and method for testing, be described in detail, the most in the above-described embodiments the most no longer to chain The embodiment of formula SVG module testing platform and method carries out repeating to repeat.

Claims (8)

1. a chain type SVG module test system, it is characterised in that including: test platform and at least two SVG module, at least One of them SVG module is module to be measured；Described test platform includes control circuit part and main circuit part, wherein main circuit Part includes the DC line for connecting SVG module DC side and DC support electric capacity, and is used for connecting the exchange of SVG module The alternating current circuit of side, alternating current circuit connects AC network by transformator；Control circuit part be used for controlling main circuit part and Described SVG module.

Chain type SVG module the most according to claim 1 test system, it is characterised in that the former limit of described transformator also sets There is pre-charge circuit.

Chain type SVG module the most according to claim 1 test system, it is characterised in that connect described transformer secondary Alternating current circuit is provided with inductance.

Chain type SVG module the most according to claim 1 test system, it is characterised in that described test system also includes using In the device for testing temperature rise measuring SVG module.

5. a chain type SVG module test platform, it is characterised in that including: control circuit part and main circuit part；Main circuit Part for being connected formation loop with at least two SVG module, and main circuit part includes for connecting the straight of SVG module DC side Flow Line and DC support electric capacity, and for connecting the alternating current circuit of SVG module AC, alternating current circuit is by transformator even Connect AC network；Control circuit part is used for controlling main circuit part and described SVG module.

Chain type SVG module test platform the most according to claim 5, it is characterised in that the former limit of described transformator also sets There is pre-charge circuit.

Chain type SVG module test platform the most according to claim 5, it is characterised in that connect described transformer secondary Alternating current circuit is provided with inductance.

8. chain type SVG module tests the method for testing of system as claimed in claim 1, it is characterised in that comprise the following steps:

For forming two SVG modules of loop, one of them SVG module is DC voltage control, and another SVG module is electricity Flow control, and the referenced reactive current controlling two SVG modules is contrary.