Southeast University

State Grid Corporation of China

State Grid Jiangsu Electric Power Company

Yangzhou Power Supply Branch of State Grid Jiangsu Electric Power Co., Ltd.

Yu Chen

Wu Chen

Yang Xu

Lian Zhu Liu

Peipei Li

Ruirui Li

Renjie Sui

Dajun Ma

Xiang Wu

Jingyuan Wang

Zhong Liu

Huanhuan Wang

Xin Zhan

The invention discloses privacy protection query language PQL and system thereof, comprising PQL statement and system, the system comprises parsing module, query module and noise-injection module; the parsing module comprises lexical analyzer and syntactic analyzer; user inputs PQL statement according to predetermined semantic and syntactic rules, after parsing module receives the PQL statement, lexical analyzer performs error checks on the PQL statement, correct results are sent to syntactic analyzer; the syntactic analyzer performs grammatical and semantic checks on PQL statement, generates a mapping table and a parameter table with correct results; after receiving mapping table, the query module encapsulates the same into SQL statement, and verifies the encapsulated SQL statement; the noise-injection module obtains final query results of the query module, calculates noise injection sensitivity according to parameter table; the invention ensures the data privacy security and satisfies that the injected noise does not affect data availability.

Method to use privacy protection query language PQL to improve the security of shared date

The present disclosure relates to a submodule topology circuit for a modular multilevel converter and a method for controlling same. The submodule topology comprises an inlet port and an outlet port, at least two half-bridge submodules, a plurality of first switching devices, a plurality of thyristors and a plurality of diodes, wherein the at least two half-bridges are connected in series and are provided between the inlet port and the outlet port, and each of the half-bridge submodules is provided with an input port, a first output port and a second output port.

Submodule topology circuit for modular multilevel converter and method for controlling same

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Jiangsu, China

Yu Chen