CN108493958B - Broadband oscillation suppression equipment for new energy power generation station and control method thereof - Google Patents

Broadband oscillation suppression equipment for new energy power generation station and control method thereof Download PDF

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CN108493958B
CN108493958B CN201810250954.6A CN201810250954A CN108493958B CN 108493958 B CN108493958 B CN 108493958B CN 201810250954 A CN201810250954 A CN 201810250954A CN 108493958 B CN108493958 B CN 108493958B
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CN108493958A (en
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罗安
伍文华
陈燕东
周乐明
周小平
杨苓
谢志为
刘津铭
何志兴
徐元璨
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Hunan University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract

The invention discloses broadband oscillation suppression equipment for a new energy power generation station and a control method thereof. The impedance characteristic analysis unit is used for analyzing the impedance characteristics of the new energy power generation station and the power grid, diagnosing an impedance frequency band of the new energy power generation station which is easy to interact with the power grid to oscillate through an impedance analysis method, and obtaining expected output impedance of the three-phase cascade multilevel converter. The three-phase cascade multilevel converter is connected to a 35kV bus of the new energy power generation station through a 10kV/35kV coupling transformer and adopts direct-current side voltage outer-loop PI control, submodule voltage-sharing control and current inner-loop quasi-PR control. The invention can improve the stability of the new energy power station, reduce the wind and light abandoning rate of the power system and promote the consumption of new energy.

Description

Broadband oscillation suppression equipment for new energy power generation station and control method thereof
Technical Field
The invention relates to the field of small disturbance stability control in new energy power generation, in particular to broadband oscillation suppression equipment of a new energy power generation station and a control method thereof.
Background
With the increasing exhaustion of fossil energy and the aggravation of environmental problems such as global warming, the development and utilization of new energy becomes the best choice for people to seek energy structure adjustment and realize sustainable development. When the new energy power generation station is analyzed to be connected to a power grid, the impedance characteristic of the power grid has an important influence on the stable operation and control of power electronic equipment such as wind power, a photovoltaic grid-connected inverter and the like in the new energy power generation station. Ideally, the grid should behave as an ideal voltage source and the new energy generation equipment should be controlled as an ideal current source to avoid any impedance cross-coupling problems. However, in practice, large-capacity new energy power generation stations in China are mostly established in remote areas such as deserts, grasslands, mountainous areas and the like, are far away from a main network, and a power grid presents the characteristic of a high-impedance weak power grid. The impedance of the weak power grid and the impedance of the new energy power generation equipment are subjected to cross coupling, so that the stable operation of a new energy power generation system is influenced, and the large-scale development and application of new energy are severely restricted.
The method has important practical significance in researching the small disturbance stability problem of the new energy power generation station accessing the power grid system. At present, when a new energy power generation station is connected to a power grid to generate a broadband oscillation problem, the most common method in engineering is to cut off new energy power generation equipment to ensure the safety of a power system. However, the method cannot essentially solve the problems, can cause a great amount of waste of new energy, and cannot be applied along with the further increase of the installed capacity of the new energy power generation, so that the improvement of the permeability of the new energy power generation is limited. In addition, a common suppression measure is to change a control method of new energy power electronic equipment in the new energy power generation station, and reconstruct output impedance of the new energy power electronic equipment, so that equivalent loop gain of the new energy power generation station connected to a power grid meets the Nyquist stability criterion, and the safe, stable and stable operation of the system is ensured. Theoretically, the method is quite effective. However, in actual engineering practice, as new energy power generation is rapidly developed, the existing new energy power electronic equipment has huge installed capacity and various types, and if each power electronic equipment is controlled and modified, the cost is huge and the difficulty is very large. Therefore, the existing solutions for solving the problem of small disturbance stability of the new energy power station accessing to the power grid system are insufficient, the actual oscillation problem is difficult to solve, and a breakthrough of a new energy power station broadband oscillation suppression method with excellent broadband oscillation suppression effect and simple engineering practice is urgently needed.
Disclosure of Invention
The invention aims to solve the technical problem that aiming at the defects of the prior art, the invention provides equipment for suppressing broadband oscillation of a new energy power generation station and a control method thereof, so as to meet the requirement of stable operation of the new energy power generation station and make up the blank in special plug-in equipment for broadband oscillation of the new energy power generation station and the control method thereof.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a broadband oscillation suppression device of a new energy power generation station comprises an impedance characteristic analysis unit; the impedance characteristic analysis unit is connected with the three-phase cascade multilevel converter; each phase output end of the three-phase cascade multilevel converter is connected with the primary side of a coupling transformer through a filter module, and the secondary side of the coupling transformer is connected to a 35kV bus of the new energy power generation station; the three-phase cascaded multilevel converter comprises n cascaded single-phase H-bridge DC/AC converters for each phase.
The impedance characteristic analysis unit obtains expected output impedance of the three-phase cascade multilevel converter according to impedance characteristics of the new energy power generation station and the power grid by adopting an impedance analysis method
Figure BDA0001607755020000021
In the invention, n is 15-40.
The coupling transformer is a Y-Y type coupling transformer of 10kV/35 kV.
Correspondingly, the invention also provides a control method of the broadband oscillation suppression equipment of the new energy power station, which comprises the following steps:
1) at the starting point of each sampling period, three-phase voltage u on the alternating current side of the three-phase cascade multilevel convertera、ub、ucAnd three-phase output current iLa、iLb、iLcAnd to a three-phase stageDC side voltage u of each single-phase H-bridge DC/AC converter of cascade multilevel converterAx、uBx、uCxSampling is respectively carried out, wherein subscripts A, B and C respectively represent A phase, B phase and C phase, subscript x represents the serial number of the single-phase H-bridge DC/AC converter, x is 1 … n, and n is the number of the single-phase H-bridge DC/AC converters of each phase;
2) calculating the average value u of the DC side voltage of each single-phase H-bridge DC/AC converter of each phaseavga、uavgb、uavgcA DC side voltage command signal
Figure BDA0001607755020000022
Are respectively connected with uavga、uavgb、uavgcMaking a difference, and sending the obtained difference value to a PI controller to obtain an active current amplitude instruction of three phases
Figure BDA0001607755020000023
3) The active current amplitude value of three phases is instructed
Figure BDA0001607755020000024
Respectively correspond to sin thetaPLL、sin(θPLL-2π/3)、sin(θPLL+2 pi/3) to obtain three-phase active current instantaneous value command
Figure BDA0001607755020000031
Wherein theta isPLLIs a voltage uaThe phase of (d);
4) will voltage ua、ub、ucAre respectively divided by
Figure BDA0001607755020000032
Obtaining current instantaneous value instruction of three-phase virtual impedance branch circuit
Figure BDA0001607755020000033
Will be provided with
Figure BDA0001607755020000034
Respectively and
Figure BDA0001607755020000035
Figure BDA0001607755020000036
adding to obtain three-phase output current instruction of three-phase cascade multilevel converter
Figure BDA0001607755020000037
Figure BDA0001607755020000038
5) Output three-phase current instruction
Figure BDA0001607755020000039
Respectively connected with three-phase output current iLa、iLb、iLcMaking difference, and sending the obtained difference value into a quasi-PR controller to obtain three-phase modulated wave signal ura、urb、urc；
6) Average value u of DC side voltage of each single-phase H-bridge DC/AC converter of three phasesavga、uavgb、uavgcRespectively connected with the DC side voltage u of each single-phase H-bridge DC/AC converter of three phasesAx、uBx、uCxMaking difference, multiplying the obtained difference values by a proportionality coefficient K, and multiplying the product by three-phase output current iLa、iLb、iLcObtaining a modulation wave signal delta u of voltage equalization of the direct current side of each single-phase H-bridge DC/AC converter of three phasesAx、ΔuBx、ΔuCx；
7) Will ura、urb、urcAnd Δ uAx、ΔuBx、ΔuCxCorrespondingly adding the signals to obtain modulation wave signals u of the single-phase H-bridge DC/AC converters of three phasesrax、urbx、urcx；
8) For u is pairedrax、urbx、urcxAnd performing carrier phase shift multi-level modulation with the triangular carrier to obtain PWM signals of the switching tubes in the three-phase single-phase H-bridge DC/AC converters to control the on and off of the switching tubesAnd (6) turning off.
In step 2), the transfer function of the PI controller is:
Figure BDA00016077550200000310
wherein Kpi_pProportional coefficient of PI controller, Kpi_iIs the integral coefficient of the PI controller, Kpi_pTaking 0.01-50, Kpi_iTaking 0.1-200.
In step 5), the transfer function of the quasi-PR controller is as follows:
Figure BDA00016077550200000311
wherein Kpquasi-PR controlled proportionality coefficient, KiIntegral coefficient, ω, for quasi-PR controlcFor the resonance bandwidth, ω0For the grid angular frequency, KpTaking 0.1-10, K i1 to 200, omegacTaking 0.1-1000.
Compared with the prior art, the invention has the beneficial effects that: the invention meets the requirement of stable access to a weak power grid of the new energy power generation station, is simple and practical, and makes up the blank in the special external hanging equipment and control method for broadband oscillation of the new energy power generation station; the equipment can actively adjust the impedance characteristic of the whole new energy power generation station, so that the equivalent loop gain of the new energy power generation station connected to a power grid meets the Nyquist stability criterion, and the broadband oscillation problem of the new energy power generation station is suppressed. The invention can improve the stability of the new energy power station, reduce the wind and light abandoning rate of the power system and promote the consumption of new energy.
Drawings
Fig. 1 is a structural diagram of a broadband oscillation suppression dedicated equipment system of a new energy power station according to an embodiment of the present invention;
fig. 2 is a control block diagram of the special equipment for suppressing broadband oscillation of the new energy power generation station according to an embodiment of the present invention;
fig. 3 is a grid-connected current simulation waveform diagram of the new energy power station after the new energy power station is put into the broadband oscillation suppression special equipment of the new energy power station.
Fig. 4 is a grid-connected voltage simulation waveform diagram of the new energy power station after the new energy power station is put into the broadband oscillation suppression special equipment of the new energy power station.
Detailed Description
As shown in fig. 1, the structure diagram of the broadband oscillation suppression special equipment system of the new energy power generation station in the embodiment of the invention includes an impedance characteristic analysis unit, a three-phase cascade multilevel converter and a 10kV/35kV coupling transformer. The impedance characteristic analysis unit obtains expected output impedance of the three-phase cascade multilevel converter according to impedance characteristics of the new energy power generation station and the power grid by adopting an impedance analysis method
Figure BDA0001607755020000041
Each phase of the three-phase cascade multilevel converter comprises n cascaded single-phase H-bridge DC/AC converters; SMA1、SMA2…SM An1 st to nth single-phase H-bridge DC/AC converters respectively representing A phases of the three-phase cascade multilevel converter; SMB1、SMB2…SM Bn1 st to nth single-phase H-bridge DC/AC converters respectively representing B phases of the three-phase cascade multilevel converter; SMC1、SMC2…SMCnThe 1 st to the nth single-phase H bridge DC/AC converters of the three-phase cascade multi-level converter C phase are respectively shown. The topological result of the single-phase H-bridge DC/AC converter mainly comprises 4 IGBT power tubes and a direct-current side capacitor. Each phase output of the three-phase cascade multilevel converter is connected with an inductive filtering module Lf. Inductance filtering module LfThe broadband oscillation suppression special equipment of the new energy power generation station is connected to a 35kV bus through a 10kV/35kV coupling transformer. The new energy power generation station can be a wind power plant, a photovoltaic power station or other new energy stations. u. ofa、ub、ucThe three-phase voltage is the three-phase voltage of the alternating current side of the three-phase cascade multilevel converter; i.e. iLa、iLb、iLcThe three-phase output current is output by the three-phase cascade multilevel converter on the alternating current side.
Fig. 2 is a control block diagram of the special equipment for suppressing broadband oscillation of the new energy power station, and the control steps of the special equipment for suppressing broadband oscillation of the new energy power station are as follows:
1) at the starting point of each sampling period, three-phase voltage u on the alternating current side of the three-phase cascade multilevel convertera、ub、ucAnd three-phase output current iLa、iLb、iLcAnd a DC-side voltage u to each single-phase H-bridge DC/AC converter of three phasesAx、uBx、uCxSampling is respectively carried out, wherein subscripts A, B and C respectively represent A phase, B phase and C phase, subscript x represents the serial number of the single-phase H-bridge DC/AC converter, x is 1 … n, and n is the number of the single-phase H-bridge DC/AC converters of each phase;
2) calculating the average value u of the DC side voltage of each single-phase H-bridge DC/AC converter of each phaseavga、uavgb、uavgcA DC side voltage command signal
Figure BDA0001607755020000051
And uavga、uavgb、uavgcMaking a difference, and sending the obtained difference value to a PI controller to obtain an active current amplitude instruction of three phases
Figure BDA0001607755020000052
3) The active current amplitude value of three phases is instructed
Figure BDA0001607755020000053
Are each in contact with sin θPLL、sin(θPLL-2π/3)、sin(θPLL+2 pi/3) multiplication to obtain three-phase active current instantaneous value command
Figure BDA0001607755020000054
Wherein theta isPLLIs a voltage uaThe phase of (d);
4) will voltage ua、ub、ucAre respectively divided by
Figure BDA0001607755020000055
Obtaining current instantaneous value instruction of three-phase virtual impedance branch circuit
Figure BDA0001607755020000056
Will be provided with
Figure BDA0001607755020000057
Respectively and
Figure BDA0001607755020000058
adding to obtain three-phase output current instruction of three-phase cascade multilevel converter
Figure BDA0001607755020000059
5) Output three-phase current instruction
Figure BDA00016077550200000510
Respectively connected with three-phase output current iLa、iLb、iLcMaking difference, and sending the obtained difference value into a quasi-PR controller to obtain three-phase modulated wave signal ura、urb、urc；
6) Average value u of DC side voltage of each single-phase H-bridge DC/AC converter of three phasesavga、uavgb、uavgcRespectively connected with the DC side voltage u of each single-phase H-bridge DC/AC converter of three phasesAx、uBx、uCxMaking difference, multiplying the obtained difference values by a proportionality coefficient K, and multiplying the product by three-phase output current iLa、iLb、iLcObtaining a modulation wave signal delta u of voltage equalization of the direct current side of each single-phase H-bridge DC/AC converter of three phasesAx、ΔuBx、ΔuCx；
7) Modulating wave signal ura、urb、urcAnd modulated wave signal DeltauAx、ΔuBx、ΔuCxRespectively adding to obtain modulation wave signals u of single-phase H-bridge DC/AC converters of three phasesrax、urbx、urcx；
8) For u is pairedrax、urbx、urcxAnd carrying out carrier phase shift multi-level modulation on the triangular carrier to obtain PWM signals of switching tubes in the three-phase single-phase H-bridge DC/AC converters, and controlling the switching-on and switching-off of the switching tubes.
1. In step 2) of the control method, the transfer function of the PI control is:
Figure BDA0001607755020000061
wherein Kpi_pProportional coefficient of PI controller, Kpi_pTaking 0.01-50, Kpi_iIs the integral coefficient of the PI controller, Kpi_iTaking 0.1-200.
2. In step 5) of the control method, the transfer function of the quasi-PR control is as follows:
Figure BDA0001607755020000062
wherein Kpquasi-PR controlled proportionality coefficient, KpTaking 0.1-10, Kiquasi-PR controlled integral coefficient, K i1 to 200, omegacFor the resonance bandwidth, ωcTaking 0.1-1000, omega0Is the grid angular frequency.
Fig. 3 and 4 are a grid-connected current simulation waveform diagram and a grid-connected voltage simulation waveform diagram of a new energy power station after the new energy power station is put into a special device for broadband oscillation suppression of the new energy power station, respectively. In the figure, iga、igb、igcThe three-phase grid-connected current is the three-phase grid-connected current of the new energy power generation station; u. ofga、ugb、ugcThe three-phase grid-connected voltage is the three-phase grid-connected voltage of the new energy power generation station; and (3) the broadband oscillation suppression special equipment of the new energy power station is put into operation at the moment of 0.6 second. From the figure, after the new energy station is put into the special equipment for suppressing the broadband oscillation of the new energy power station, the oscillation phenomenon can be thoroughly solved, and the effectiveness of the preparation and the control method thereof is proved.

Claims (8)

1. A control method of broadband oscillation suppression equipment of a new energy power generation station comprises the following steps of analyzing impedance characteristics; the impedance characteristic analysis unit is connected with the three-phase cascade multilevel converter; each phase output end of the three-phase cascade multilevel converter is connected with the primary side of a coupling transformer through a filter module, and the secondary side of the coupling transformer is connected to a 35kV bus of the new energy power generation station; each phase of the three-phase cascade multilevel converter comprises n cascaded single-phase H-bridge DC/AC converters; the method is characterized by comprising the following steps:
1) at the starting point of each sampling period, three-phase voltage u on the alternating current side of the three-phase cascade multilevel convertera、ub、ucAnd three-phase output current iLa、iLb、iLcAnd a direct-current side voltage u for each single-phase H-bridge DC/AC converter of the three-phase cascade type multilevel converterAx、uBx、uCxSampling is respectively carried out, wherein subscripts A, B and C respectively represent A phase, B phase and C phase, subscript x represents the serial number of the single-phase H-bridge DC/AC converter, x is 1 … n, and n is the number of the single-phase H-bridge DC/AC converters of each phase;
2) calculating the average value u of the DC side voltage of each single-phase H-bridge DC/AC converter of each phaseavga、uavgb、uavgcA DC side voltage command signal
Figure FDA0002976194540000011
Are respectively connected with uavga、uavgb、uavgcMaking a difference, and sending the obtained difference value to a PI controller to obtain an active current amplitude instruction of three phases
Figure FDA0002976194540000012
3) The active current amplitude value of three phases is instructed
Figure FDA0002976194540000013
Respectively correspond to sin thetaPLL、sin(θPLL-2π/3)、sin(θPLL+2 pi/3) to obtain three-phase active current instantaneous value command
Figure FDA0002976194540000014
Wherein theta isPLLIs a voltage uaThe phase of (d);
4) will voltage ua、ub、ucAre respectively divided by
Figure FDA0002976194540000015
Obtaining current instantaneous value instruction of three-phase virtual impedance branch circuit
Figure FDA0002976194540000016
Will be provided with
Figure FDA0002976194540000017
Respectively and
Figure FDA0002976194540000018
Figure FDA0002976194540000019
adding to obtain three-phase output current instruction of three-phase cascade multilevel converter
Figure FDA00029761945400000110
Figure FDA00029761945400000111
5) Output three-phase current instruction
Figure FDA00029761945400000112
Respectively connected with three-phase output current iLa、iLb、iLcMaking difference, and sending the obtained difference value into a quasi-PR controller to obtain three-phase modulated wave signal ura、urb、urc；
6) Average value u of DC side voltage of each single-phase H-bridge DC/AC converter of three phasesavga、uavgb、uavgcRespectively connected with the DC side voltage u of each single-phase H-bridge DC/AC converter of three phasesAx、uBx、uCxMaking difference, multiplying the obtained difference values by a proportionality coefficient K, and multiplying the product by three-phase output current iLa、iLb、iLcObtaining a modulated wave signal with voltage equalization on the direct current side of each single-phase H-bridge DC/AC converter of three phasesΔuAx、ΔuBx、ΔuCx；
7) Will ura、urb、urcAnd Δ uAx、ΔuBx、ΔuCxCorrespondingly adding the signals to obtain modulation wave signals u of the single-phase H-bridge DC/AC converters of three phasesrax、urbx、urcx；
8) For u is pairedrax、urbx、urcxAnd carrying out carrier phase shift multi-level modulation on the triangular carrier to obtain PWM signals of switching tubes in the three-phase single-phase H-bridge DC/AC converters, and controlling the switching-on and switching-off of the switching tubes.
2. The method for controlling broadband oscillation suppression equipment for a new energy power generation station according to claim 1, wherein the impedance characteristic analysis unit obtains the expected output impedance of the three-phase cascade multilevel converter according to the impedance characteristics of the new energy power generation station and the power grid by using an impedance analysis method
Figure FDA0002976194540000021
3. The control method of the broadband oscillation suppression device of the new energy power station according to claim 1, wherein n is 15-40.
4. The control method of the broadband oscillation suppression equipment of the new energy power generation station according to claim 1, wherein the coupling transformer is a Y-Y type coupling transformer of 10kV/35 kV.
5. The method according to claim 1, wherein in step 2), the transfer function of the PI controller is:
Figure FDA0002976194540000022
wherein Kpi_pProportional coefficient of PI controller, Kpi_iIs the integral coefficient of the PI controller.
6. The method of claim 5, wherein K ispi_pTaking 0.01-50, Kpi_iTaking 0.1-200.
7. The method of claim 1, wherein in step 5), the transfer function of the quasi-PR controller is:
Figure FDA0002976194540000031
wherein Kpquasi-PR controlled proportionality coefficient, KiIntegral coefficient, ω, for quasi-PR controlcFor the resonance bandwidth, ω0Is the grid angular frequency.
8. The method of claim 7, wherein K ispTaking 0.1-10, Ki1 to 200, omegacTaking 0.1-1000.
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CN110957759B (en) * 2019-11-20 2022-08-05 合肥工业大学 Control method of cascade impedance adapter for stabilizing grid-connected inverter system
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CN112736982B (en) * 2021-03-30 2021-06-25 湖南大学 Broadband oscillation suppression method and system for new energy grid-connected converter
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