Systematic Application and Practical Value of Soundproof Enclosures in Noise Control of Converter Stations

Converter stations, as key facilities in the power system, ensure the stable operation of the regional power grid. However, the continuous operation of their internal transformers, reactors, and other equipment generates low-to-medium frequency electromagnetic noise and vibration, impacting the surrounding acoustic environment. With increasingly stringent national environmental policies and heightened public environmental awareness, noise control at converter stations has become a crucial issue for the green transformation of the power industry. Soundproof enclosures, as an efficient and mature noise control method, play a key role in such scenarios.

I. Main Noise Sources and Characteristics of Converter Stations

The main sources of noise in converter stations are:

Converter transformers: Generate low-frequency electromagnetic noise, primarily around 100Hz, during operation. This noise has strong penetrating power and propagates over long distances.

Smoothing reactors: Vibration and airborne noise combine, resulting in a wide frequency band and making noise control difficult.

Cooling system: Fan operation generates mid-to-high frequency aerodynamic noise.

These noises are characterized by high sound pressure levels, complex frequency bands, and slow attenuation, easily causing excessive impacts on the acoustic environment outside the station boundary.

II. Noise Reduction Mechanism and Technical Approach of Soundproof Enclosures

Soundproof enclosures achieve effective noise control through a four-in-one system design encompassing sound insulation, sound absorption, noise reduction, and sealing:

Sound Insulation Structure: The enclosure is constructed using multi-layered composite panels (such as metal plates + damping layers + sound-absorbing cotton) to enhance overall sound insulation and block noise propagation.

Sound-Absorbing Lining: Porous sound-absorbing material is laid on the inner side of the enclosure to reduce reverberation and minimize noise reflection and superposition.

Noise Reduction and Ventilation: Equipped with silencers and a ventilation and heat dissipation system, it ensures normal equipment operation while preventing sound leakage.

Sealing Design: Elastic sealing materials are used at interfaces and gaps to block the "sound bridge" effect.

By installing overall or partial soundproof enclosures, noise levels of critical equipment within the station can be reduced by 15–25 dB(A), significantly reducing the impact on the surrounding environment.

III. Legal, Regulatory, and Policy Basis

National and local governments continue to strengthen the control of noise from power facilities:

The *Noise Pollution Prevention and Control Law of the People's Republic of China* explicitly requires industrial enterprises to take effective measures to prevent and control environmental noise pollution;

The *Emission Standard for Industrial Enterprises at Boundary* (GB 12348-2008) sets strict daytime and nighttime noise limits for the functional areas where converter stations are located;

Local environmental protection departments strengthen environmental impact assessment approvals and noise monitoring during the operation of power projects, promoting the implementation of pollution control responsibilities.

The use of soundproof enclosures is a key technical means for power companies to fulfill their environmental responsibilities and achieve compliant emissions.

IV. Significance and Comprehensive Benefits of Noise Reduction Projects

Implementing noise reduction projects not only has environmental compliance value but also broad social and strategic significance:

Environmentally Friendly: Reduces noise interference to surrounding residential areas, improving the quality of the living environment;

Corporate Responsibility: Establishes a green, compliant, and responsible social image for power companies;

Sustainable Development: Contributes to the construction of "Quiet Cities," supporting the harmonious coexistence of power grid facilities and urban ecology;

Technology Promotion Value: Provides reusable system solutions for noise control of similar power facilities such as converter stations and substations.

As a professional acoustic environment system service provider, Environment is committed to providing integrated noise reduction services for power facilities such as converter stations and substations, from noise assessment, solution design, product customization to project implementation. In the future, we will continue to promote the integration of sound insulation technology and intelligent monitoring, contributing to the construction of a clean, low-carbon, safe, and quiet energy environment.