CN109459615A - High pressure impedance measurement device and control method based on cascade multi-level converter - Google Patents
High pressure impedance measurement device and control method based on cascade multi-level converter Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a kind of high pressure impedance measurement device and control method based on cascade multi-level converter, the device includes voltage disturbance injection unit, signal processing unit, wide-band impedance calculates and monitoring unit, control unit, wherein voltage disturbance injection unit is constituted by multiple power modules are unit cascaded, the every n sub- power module units of phase cascade of three-phase, each unit takes electricity from power grid by the transformer that no-load voltage ratio is k:1, each mutually series connection access examining system after LC is filtered, provides voltage disturbance source.Every sub- power module unit is made of prime single-phase full bridge rectifier, rear class single-phase full-bridge inverter.Prime single-phase full bridge rectifier uses outer voltage PI electric current P double-closed-loop control, provides steady dc voltage for rear class single-phase full-bridge inverter；Cascade connection type rear class single-phase full-bridge inverter uses opened loop control, and the power device conducting and shutdown of every phase rear class single-phase full-bridge inverter are controlled by phase-shifted SPWM Multilevel modulation.Used control method makes system reliability with higher and faster dynamic response, meets system applied to high-power occasion and the requirement of broadband disturbance output impedance measurement.
Description
Technical field
The present invention relates to the impedance measurement technique fields in generation of electricity by new energy, especially a kind of to be become based on cascading multiple electrical level
The high pressure impedance measurement device and control method of parallel operation.
Background technique
The development and utilization of new energy is growing, the stable operation of new energy and its interaction between power grid at
The hot spot focused for domestic and foreign scholars.When analyzing extensive generation of electricity by new energy equipment access power grid, the impedance operator of power grid
The stable operation and control of the power electronics such as wind-force, photovoltaic combining inverter equipment are had an important influence on.Ideally, electric
Net should show as ideal voltage source, and generation of electricity by new energy equipment should control as ideal current source, to avoid any impedance friendship
Mutual coupling problem.However in practice, the new energy power station of China's large capacity is established in remote districts such as deserts more, negative apart from electricity consumption
Lotus is farther out.Since the electric network impedance that transformer and long power transmission line introduce is larger, and the external characteristics of generation of electricity by new energy equipment is not yet
Ideal current source can be shown as, this will lead to the impedance of weak grid and coupling interaction occurs for the impedance of generation of electricity by new energy equipment,
Influence the stable operation of grid-connected power generation system.Therefore, large-scale new-energy grid-connected is sent out in the impedance measurement of generation of electricity by new energy equipment
The stability study of electric system has important practical significance.Initial data needed for impedance analysis method is few and simple and effective, resistance
Anti- measurement is the data source of impedance analysis and the important channel of built impedance model Accuracy Verification, wherein disturbing harmonic injection
Accurate impedance measurement has may be implemented in method, can achieve different measurements by the different disturbing signal of selection injection and wants
Ask disturbance injection mode by the type of disturbance can be divided into voltage disturbance injection mode and current disturbing injection mode, pass through respectively to
The disturbance of series, parallel injection broadband voltage, current disturbing, the disturbance for obtaining equipment side to be measured are rung between equipment and power grid to be measured
It answers, obtains wide-band impedance characteristic curve through impedance computation.
Summary of the invention
The technical problem to be solved by the present invention is in view of the shortcomings of the prior art, provide a kind of based on cascading multiple electrical level
It is defeated applied to high-power occasion and broadband disturbance to meet system for the high pressure impedance measurement device and control method of converter
The requirement of impedance measurement out.
In order to solve the above technical problems, the technical scheme adopted by the invention is that: one kind is converted based on cascading multiple electrical level
The high pressure impedance measurement device of device, including voltage disturbance injection unit；The voltage disturbance injection unit is by multiple power modules
Unit cascaded composition, the every n sub- power module units of phase cascade of three-phase, the change that each sub- power module unit is k:1 by no-load voltage ratio
Depressor takes electricity from power grid, and each mutually series connection access examining system after LC is filtered provides voltage disturbance source；Every sub- power module list
Member is including prime single-phase full bridge rectifier and the rear class single-phase full-bridge inverter connecting with the prime single-phase full bridge rectifier.
Correspondingly, the control of the present invention also provides a kind of high pressure impedance measurement device based on cascade multi-level converter
Method processed, comprising the following steps:
1) straight to the high pressure impedance measurement device based on cascade multi-level converter in the starting point in each sampling period
Flow side voltage va_i、vb_i、vc_i, prime single-phase full bridge rectifier input current iLa_i、iLb_i、iLc_iIt is sampled respectively；I=1,
2,…,n；
2) by DC voltage command signal VrefThe DC voltage v obtained respectively with samplinga_i、vb_i、vc_iIt is poor to make, and obtains
To voltage error amount Δ ua_i、Δub_i、Δuc_i；
3) voltage error amount Δ ua_i、Δub_i、Δuc_iThrough outer voltage PI control after clipping export, resulting value by phase with
Synchronized signal sin (ω t), sin (π/3 ω t+2), sin (π/3 ω t-2) are multiplied, and obtain current command signal irefa_i、
irefb_i、irefc_i；ω is power grid fundamental wave frequency；
4) by current command signal irefa_i、irefb_i、irefc_iThe prime single-phase full bridge rectifier obtained respectively with sampling is defeated
Enter electric current iLa_i、iLb_i、iLc_iIt is poor to make, and obtains current error amount Δ iLa_i、ΔiLb_i、ΔiLc_i；
5) by current error amount Δ iLa_i、ΔiLb_i、ΔiLc_iIt is controlled through current inner loop P, gained signal is obtained through PWM modulation
To the control signal u of prime single-phase full bridge rectifier switch pipera1、ura2、…、ura4n、urb1、urb2、…、urb4n、urc1、
urc2、…、urc4n, control opening and turning off for prime rectification circuit switching tube；
6) opened loop control command signal Uref_a、Uref_b、Uref_cThrough phase-shifted SPWM Multilevel modulation, rear class list is obtained
The control signal u of phase full-bridge inverter switching tubeia1、uia2、…、uia4n、uib1、uib2、…、uib4n、uic1、uic2、…、uic4n, control
Rear class inverter circuit switching tube processed being opened and turning off.
Compared with prior art, the advantageous effect of present invention is that: present invention accomplishes in generation of electricity by new energy base
Fining needed for power generating equipment simulation model requirement, provide it is a kind of high pressure, MW class, wide-band impedance characteristic it is accurate
Measurement method and equipment.
Detailed description of the invention
Fig. 1 be high pressure impedance measurement device system structure of the one embodiment of the invention based on cascade multi-level converter and
Its control block diagram；
Fig. 2 is the controller chassis of high pressure impedance measurement device of the one embodiment of the invention based on cascade multi-level converter
Figure.
Specific embodiment
As shown in Figure 1, a kind of high pressure impedance measurement device based on cascade multi-level converter of one embodiment of the invention
And control method, including voltage disturbance injection unit, signal processing unit, wide-band impedance calculate and monitoring unit, control list
Member, wherein voltage disturbance injection unit is constituted by multiple power modules are unit cascaded, the every n sub- power module lists of phase cascade of three-phase
Member, each unit take electricity from power grid by the transformer that no-load voltage ratio is k:1, and each mutually series connection access examining system after LC is filtered provides
Voltage disturbance source.Every sub- power module unit is made of prime single-phase full bridge rectifier, rear class single-phase full-bridge inverter.Figure
In, va_1For the DC voltage of the 1st group of rectifier of A phase, va_2For the DC voltage of the 2nd group of rectifier of A phase, va_nFor A phase
The DC voltage of n group rectifier, vb_1For the DC voltage of the 1st group of rectifier of B phase, vb_2For the straight of the 2nd group of rectifier of B phase
Flow side voltage, vb_nFor the DC voltage of B phase n-th group rectifier, vc_1For the DC voltage of the 1st group of rectifier of C phase, vc_2
For the DC voltage of the 2nd group of rectifier of C phase, vc_nFor the DC voltage of C phase n-th group rectifier, iLa_1It is whole for A phase the 1st
Flow the input current of device, iLa_2For the input current of the 2nd rectifier of A phase, iLa_nFor the input current of n-th of rectifier of A phase,
iLb_1For the input current of the 1st rectifier of B phase, iLb_2For the input current of the 2nd rectifier of B phase, iLb_nIt is whole for n-th of B phase
Flow the input current of device, iLc_1For the input current of the 1st rectifier of C phase, iLc_2For the input current of the 2nd rectifier of C phase,
iLc_nFor the input current of n-th of rectifier of C phase, L is filter inductance, and it is filter capacitor that all inductance, which take 1mH, C, in the present apparatus,
LgFor power grid equivalent inductance, RgFor power grid equivalent resistance, vpa、vpb、vpcFor the three-phase disturbance voltage of injection, iga、igb、igcIt is three
Phase power network current, vga、vgb、vgcFor three-phase power grid voltage, T11、T12、T13、T14For the switching tube of single-phase full bridge rectifier, T21、
T22、T23、T24For the switching tube of single-phase full-bridge inverter.
Fig. 2 is a kind of control of the high pressure impedance measurement device based on cascade multi-level converter of one embodiment of the invention
Method, which is characterized in that prime single-phase full bridge rectifier uses outer voltage PI electric current P double-closed-loop control, is that rear class is single-phase complete
Bridge inverter provides steady dc voltage；Cascade connection type rear class single-phase full-bridge inverter uses opened loop control, passes through phase-shifting carrier wave
SPWM Multilevel modulation controls the power device conducting and shutdown of every phase rear class single-phase full-bridge inverter.This method includes following step
It is rapid: in the starting point in each sampling period, to the high pressure impedance measurement device DC side electricity based on cascade multi-level converter
Press va_i(va_iIndicate i-th of rectifier of A phase DC voltage, i=1,2 ..., n, hereafter signal and so on), vb_i、
vc_i, prime single-phase full bridge rectifier input current iLa_i、iLb_i、iLc_iIt is sampled respectively；By DC voltage command signal
VrefThe DC voltage v obtained respectively with samplinga_i、vb_i、vc_iIt is poor to make, and obtains voltage error amount Δ ua_i、Δub_i、Δuc_i；
Voltage error amount Δ ua_i、Δub_i、Δuc_iClipping exports after outer voltage PI control, and resulting value is believed by phase and synchronized
Number sin (ω t), sin (π/3 ω t+2), sin (π/3 ω t-2) are multiplied (ω is power grid fundamental wave frequency), obtain current-order letter
Number irefa_i、irefb_i、irefc_i；By current command signal irefa_i、irefb_i、irefc_iThe prime obtained respectively with sampling is single-phase complete
Bridge rectifier input current iLa_i、iLb_i、iLc_iIt is poor to make, and obtains current error amount Δ iLa_i、ΔiLb_i、ΔiLc_i；Electric current is missed
Residual quantity Δ iLa_i、ΔiLb_i、ΔiLc_iIt is controlled through current inner loop P, gained signal obtains the rectification of prime single-phase full bridge through PWM modulation
The control signal u of device switching tubera1、ura2、…、ura4n、urb1、urb2、…、urb4n、urc1、urc2、…、urc4n, control prime rectification
Circuit switch pipe being opened and turning off；Opened loop control command signal Uref_a、Uref_b、Uref_cThrough the more level tune of phase-shifted SPWM
System, obtains the control signal u of rear class single-phase full-bridge inverter switching tubeia1、uia2、…、uia4n、uib1、uib2、…、uib4n、uic1、
uic2、…、uic4n, control opening and turning off for rear class inverter circuit switching tube.
Claims (2)
1. a kind of high pressure impedance measurement device based on cascade multi-level converter, which is characterized in that infused including voltage disturbance
Enter unit；The voltage disturbance injection unit is constituted by multiple power modules are unit cascaded, the every n sub- power moulds of phase cascade of three-phase
Module unit, each sub- power module unit take electricity from power grid by the transformer that no-load voltage ratio is k:1, each access of mutually connecting after LC is filtered
Examining system provides voltage disturbance source；Every sub- power module unit include prime single-phase full bridge rectifier and with it is described before
The rear class single-phase full-bridge inverter of grade single-phase full bridge rectifier connection.
2. a kind of control method of the high pressure impedance measurement device based on cascade multi-level converter, which is characterized in that including
Following steps:
1) in the starting point in each sampling period, to the high pressure impedance measurement device DC side based on cascade multi-level converter
Voltage va_i、vb_i、vc_i, prime single-phase full bridge rectifier input current iLa_i、iLb_i、iLc_iIt is sampled respectively；I=1,
2,…,n；
2) by DC voltage command signal VrefThe DC voltage v obtained respectively with samplinga_i、vb_i、vc_iIt is poor to make, and obtains electricity
Hold up residual quantity Δ ua_i、Δub_i、Δuc_i；
3) voltage error amount Δ ua_i、Δub_i、Δuc_iClipping exports after outer voltage PI control, and resulting value is by phase and power grid
Synchronization signal sin (ω t), sin (π/3 ω t+2), sin (π/3 ω t-2) are multiplied, and obtain current command signal irefa_i、irefb_i、
irefc_i；ω is power grid fundamental wave frequency；
4) by current command signal irefa_i、irefb_i、irefc_iThe prime single-phase full bridge rectifier input electricity obtained respectively with sampling
Flow iLa_i、iLb_i、iLc_iIt is poor to make, and obtains current error amount Δ iLa_i、ΔiLb_i、ΔiLc_i；
5) by current error amount Δ iLa_i、ΔiLb_i、ΔiLc_iIt is controlled through current inner loop P, gained signal is through PWM modulation, before obtaining
The control signal u of grade single-phase full bridge rectifier switch pipera1、ura2、…、ura4n、urb1、urb2、…、urb4n、urc1、urc2、…、
urc4n, control opening and turning off for prime rectification circuit switching tube；
6) opened loop control command signal Uref_a、Uref_b、Uref_cThrough phase-shifted SPWM Multilevel modulation, it is single-phase complete to obtain rear class
The control signal u of bridge inverter switching tubeia1、uia2、…、uia4n、uib1、uib2、…、uib4n、uic1、uic2、…、uic4n, after control
Grade inverter circuit switching tube being opened and turning off.
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Cited By (7)
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| CN109921651A (en) * | 2019-04-01 | 2019-06-21 | 湖北工业大学 | A kind of ultrasonic power supply device based on 9 level of Mixed cascading |
| CN110618319A (en) * | 2019-10-09 | 2019-12-27 | 西南交通大学 | Device for measuring dq impedance of electric locomotive and control method thereof |
| CN111505439A (en) * | 2020-04-21 | 2020-08-07 | 国网江苏省电力有限公司电力科学研究院 | Impedance frequency sweeping device for direct current system, control method thereof and storage medium |
| CN111537799A (en) * | 2020-05-21 | 2020-08-14 | 国网江苏省电力有限公司电力科学研究院 | Topological system, control method and storage medium of series-parallel connection integrated harmonic disturbance injection impedance frequency sweeping device |
| CN111999563A (en) * | 2020-09-01 | 2020-11-27 | 浙江大学 | Multi-cascade direct current converter impedance online measurement method |
| CN113156214A (en) * | 2021-05-14 | 2021-07-23 | 西南交通大学 | Broadband impedance measuring method of dual-mode disturbance and dual-mode disturbance device |
| CN113971015A (en) * | 2021-11-10 | 2022-01-25 | 哲库科技(北京)有限公司 | UIA2 calculation circuit and data processing method, chip, electronic equipment and storage medium thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109921651A (en) * | 2019-04-01 | 2019-06-21 | 湖北工业大学 | A kind of ultrasonic power supply device based on 9 level of Mixed cascading |
| CN110618319A (en) * | 2019-10-09 | 2019-12-27 | 西南交通大学 | Device for measuring dq impedance of electric locomotive and control method thereof |
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| CN113156214A (en) * | 2021-05-14 | 2021-07-23 | 西南交通大学 | Broadband impedance measuring method of dual-mode disturbance and dual-mode disturbance device |
| CN113156214B (en) * | 2021-05-14 | 2022-04-01 | 西南交通大学 | Dual-mode broadband disturbance device and control method |
| CN113971015A (en) * | 2021-11-10 | 2022-01-25 | 哲库科技(北京)有限公司 | UIA2 calculation circuit and data processing method, chip, electronic equipment and storage medium thereof |
| CN113971015B (en) * | 2021-11-10 | 2023-09-08 | 哲库科技(北京)有限公司 | UIA2 computing circuit, data processing method, chip, electronic device and storage medium |
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Application publication date: 20190312 |