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1. WO2022041365 - POWER LIMITING METHOD APPLICABLE TO VOLTAGE SOURCE CONVERTER

Publication Number WO/2022/041365
Publication Date 03.03.2022
International Application No. PCT/CN2020/116989
International Filing Date 23.09.2020
IPC
H02J 3/36 2006.1
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
3Circuit arrangements for ac mains or ac distribution networks
36Arrangements for transfer of electric power between ac networks via a high-tension dc link
H02J 3/24 2006.1
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
3Circuit arrangements for ac mains or ac distribution networks
24Arrangements for preventing or reducing oscillations of power in networks
H02J 3/46 2006.1
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
3Circuit arrangements for ac mains or ac distribution networks
38Arrangements for parallelly feeding a single network by two or more generators, converters, or transformers
46Controlling the sharing of output between the generators, converters, or transformers
CPC
H02J 2203/20
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
2203Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
20Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
H02J 3/24
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
3Circuit arrangements for ac mains or ac distribution networks
24Arrangements for preventing or reducing oscillations of power in networks
H02J 3/36
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
3Circuit arrangements for ac mains or ac distribution networks
36Arrangements for transfer of electric power between ac networks via a high-tension dc link
H02J 3/46
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
3Circuit arrangements for ac mains or ac distribution networks
38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
46Controlling of the sharing of output between the generators, converters, or transformers
Y02E 60/60
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
60Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
60Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Applicants
  • 东南大学溧阳研究院 LIYANG RESEARCH INSTITUTE OF SOUTHEAST UNIVERSITY [CN]/[CN]
  • 东南大学 SOUTHEAST UNIVERSITY [CN]/[CN]
Inventors
  • 李周 LI, Zhou
  • 魏子昂 WEI, Ziang
Agents
  • 南京经纬专利商标代理有限公司 NANJING JINGWEI PATENT & TRADEMARK AGENCY CO., LTD
Priority Data
202010873944.526.08.2020CN
Publication Language Chinese (zh)
Filing Language Chinese (ZH)
Designated States
Title
(EN) POWER LIMITING METHOD APPLICABLE TO VOLTAGE SOURCE CONVERTER
(FR) PROCÉDÉ DE LIMITATION DE PUISSANCE APPLICABLE À UN CONVERTISSEUR DE SOURCE DE TENSION
(ZH) 一种适用于电压源型换流器的限功率方法
Abstract
(EN) The present invention provides a power limiting method applicable to a voltage source converter. According to a transmission power of a converter station, if the transmission power exceeds the capacity of the converter station, the converter station is switched from an original control policy to a power limiting control mode, so as to limit the transmission power of the converter station, thereby ensuring that the system power is not out-of-limit. If the transmission power of the converter station returns to normal, the converter station is switched back to the original control policy. In the method of the present invention, a phase angle difference between a Pcc point and a voltage at an alternating current outlet side of the converter station is calculated according to an upper limit of the transmission capacity of the converter station, so that the phase angle of the voltage at the alternating current outlet side of the converter station is adjusted, ensuring synchronous changing of the phase angles of the two, thereby achieving the effect of power limitation. The present invention can effectively constrain power, and solve the problem that a voltage source converter cannot constrain power when stabilizing an alternating current voltage by using policies such as amplitude-phase control, amplitude-frequency control, active and reactive coupling control or constant alternating-current voltage control; in addition, the capacity of the converter can be utilized to the maximum, thereby improving the safety and stability of a direct-current system.
(FR) La présente invention concerne un procédé de limitation de puissance applicable à un convertisseur de source de tension. En fonction d'une puissance de transmission d'une station de convertisseur, si la puissance de transmission dépasse la capacité de la station de convertisseur, la station de convertisseur passe d'une politique de commande d'origine à un mode de commande de limitation de puissance, de manière à limiter la puissance de transmission de la station de convertisseur, ce qui permet de s'assurer que la puissance du système n'est pas hors limite. Si la puissance de transmission de la station de convertisseur revient à la normale, la station de convertisseur est ramenée à la politique de commande d'origine. Dans le procédé de la présente invention, une différence d'angle de phase entre un point Pcc et une tension au niveau d'un côté de sortie de courant alternatif de la station de convertisseur est calculée en fonction d'une limite supérieure de la capacité de transmission de la station de convertisseur, de sorte que l'angle de phase de la tension au niveau du côté de sortie de courant alternatif de la station de convertisseur est ajusté, ce qui permet de garantir un changement synchrone des angles de phase des deux et d'obtenir comme effet une limitation de puissance. La présente invention permet de limiter efficacement la puissance et résoudre le problème selon lequel un convertisseur de source de tension ne peut pas limiter la puissance lors de la stabilisation d'une tension en courant alternatif à l'aide de politiques telles que la commande de l'amplitude/phase, la commande de l'amplitude/fréquence, la commande d'un couplage actif et réactif ou la commande d'une tension à courant alternatif constant ; en outre, la capacité du convertisseur peut être utilisée au maximum, ce qui permet d'améliorer la sécurité et la stabilité d'un système à courant continu.
(ZH) 本发明提出一种适用于电压源型换流器的限功率方法,依据换流站传输功率,在传输功率超出换流站容量时,将换流站由原始控制策略切换为限功率控制方式,限制换流站的传输功率,保证系统功率不越限。当换流站传输功率恢复正常时,换流站重新切换为原始控制策略。本发明方法根据换流站传输容量上限,计算Pcc点和换流站交流出口侧电压的相角差,进而调整换流站交流出口侧电压的相角,保证二者相角同步变化,进而达到限功率作用。本发明能够有效约束功率,解决电压源型换流器采用幅相控制,幅频控制,有功无功耦合控制或定交流电压控制等策略来稳定交流电压时无法约束功率的问题;同时能最大限度利用换流器容量,提高了直流系统的安全性和稳定性。
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