The fast real-time application message is an object-oriented substation event-GOOSE (Generic Object Oriented Substation Event). It mainly works on the process layers and bay layers of digital substation. GOOSE intelligent substation communication network can realize the key function of the overall intelligent substation functions. This paper will make a systematic analysis of GOOSE. At first, it will provide a detailed analysis of the transmission mechanism and process of GOOSE message. As certain practical operability lacks the actual application of the multicast filtering method which is applied to GOOSE message based on IEC61850 standard, this paper will summarize three message filtering methods, compare the advantages and disadvantages in topological networks of different kinds in accordance with the instantaneity of GOOSE intelligent substation communication network and draw a conclusion that the independent configuration scheme of GOOSE and SV can adapt to the requirement of times, so as to provide theoretical references for the selection of practical intelligent substation communication network in the future.

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SVG in distribution power grid has completely entered into the practical phase, as Hbridge of the core part of SVG, which is low test efficiency, poor reliability, high cost and requires repeated manual testing in the process of production. This thesis firstly analyzes the test environment of H-bridge unit, put forward the indicators, the overall design of testing system, puts forward the solution, then describes in detail the realization of the system hardware and software solutions, and finally through the chain H-bridge unit test, test the applicability of the system and work stability, this paper designed and implemented the SVG link test system has a broad application prospect. During 2001 to 2003, the United States put the large capacity SVG into use, and proved it has advantages in improving circuit transmission capacity, damping power oscillation, and enhance the system stability is superior performance, which shows that SVG has completely entered the practical stage in transmission-distribution power grid[1]. H-bridge unit, as the core module of SVG, its performance defines the overall performance of SVG system. To improve the quality of product and system safety in production, before the system put into use the performance test is deemed to undertake, the assemble can start once the test results satisfy the standard. A 35kv / 15mvar cascading SVG has 66 H-bridge unit need to be tested which require 66 times tests. As far as no H-bridge unit performance testing molding system exists, the test of H-bridge unit mainly rely on manual testing, which of low efficiency, poor reliability, high cost, difficulty in data storage, and waste of human resources. Therefore, to develop a set of reliable performance, flexible, easy to operate, suitable for a variety of voltage grade H-bridge unit test system is very meaningful [2]. 1 H-bridge Unit Test Environment 1.1 H-bridge Unit Test Platform H-bridge unit test platform is mainly responsible for DC side capacitor to H-bridge unit module provides a controlled dc power supply, its structure includes industrial power distribution cabinets, voltage regulator, transformer, three-phase rectifier bridge and its control and protection circuit, etc. After air switch closing, test platform getting power, by adjusting the voltage regulator changing the transformer three-phase AC output voltage to achieve the input DC voltage which can change the DC side of H-bridge unit. The structure of H-bridge unit test platform is shown in Figure 1. Figure 1. the circuit of test platform The main parameters of H-bridge unit test platform are as follows: