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© 2019 MOELLER & POELLER ENGINEERING LTD

INTERNATIONAL POWER SYSTEM CONSULTANTS

Offshore wind services

One of MPE's main activities in the current market is to provide consultancy & design services for large HVAC and HVDC connected offshore wind farms and offshore transmission networks. Our range of services cover concept design, reactive power optimisation, RMS & EMT studies, operational principles, loss analysis. Please say hello to let us know what your specific requirements are, and we will do our very best to help you with your project.

offshore wind farm platform design

MPE, together with our experienced offshore fabrication partners, can produce a preliminary design of an offshore substation (electrical, topside, jacket) including rating of equipment and budget estimates.
The design produced is suitable for tender specifications. We can also provide construction supervision to ensure equipment is supplied and installed to specification.

To date, MPE's clients for these activities include 50Hz and ENBW transmission companies in Germany.

reactive power planning

Whether the purpose is for grid code compliance, offshore wind farm export cable compensation, voltage stability improvement, system wide reactive power reserve planning, MPE can appropriately size and specify your reactive dynamic and static reactive power equipment in the most economic way possible while ensuring requirements and voltage stability margins are met.

Also see our project references which showcase our involvement in the OFGEM NIC NGET / UKPN Power Potential project which utilises embedded generation to provide reactive power services to transmission.

harmonic filter design

MPE can assess your project to determine if ​harmonic filtering is required. If so, we can design active or static filtering solutions to mitigate harmonic current emission or resonance issues.
We can develop concept designs, or detailed filter design including specification of individual filter components considering tolerance for frequency and voltage variation, to a level of detail suitable for tender.


MPE has experience of filter design from MV to HV including HVAC connected offshore wind farms, HVDC systems, transmission and distribution applications.

specification of equipment for tender

A good equipment specification is important to ensure that you get the most cost-effective equipment for your application with no ‘surprises’ after it is received.
Our philosophy to achieve this is to provide specifications that are clear and concise, providing enough information and requirements to ensure that equipment is suitable for the application while not placing unnecessary restrictions on the vendors which can increase costs without providing any tangible benefit.

We can provide specifications for a range of equipment, including transformers, switchgear, generators, inverters, cables, control equipment and more.

tender support & evaluation

Following specifying the equipment for your site, MPE can then help you to choose the relevant winner of each package

We can provide assistance with:

identifying suitable contracting methodologies

preparing tender documentation

determining evaluation criteria

answering tenderer questions

independent technical reviews of proposals

preparing recommendations for award

cable routing, selection & optimisation

MPE can route and select cables for your application based on technical requirements and cost impact of CAPEX and OPEX of the system. This can range from checking cable ampacity, voltage drop and short-circuit withstand to ensure compliance with applicable codes, through to optimisation of cable sizes based on installed cost, annualised losses for time-varying loads, and calculation of net present value of losses (OPEX) vs. CAPEX.

Our engineers have experience with a range of cable installation methods and voltage levels from LV to HV, and for AC and DC cabling.
We can deliver desktop and onsite surveys of cable routes using high precision GPS with RTX-correction, and a GIS (Geographic Information System)-software. Crossing of other cables, roads, and gas pipes can be considered, and alternative routes proposed as required.
We have developed an in-house tool for ampacity (temperature) calculations for unconventional cable environments and laying arrangements , e.g. for submarine cables and inhomogeneous cable groups. Our tool has additionally been extended to consider a time varying ampacity calculation. This allows us to assess the ampacity even for load profiles which are not covered by standards, e.g. load profiles of wind or PV farms.

​owner's engineer activities

MPE can act as an owner's engineer, providing independent advice and expertise to ensure the success of your project.
We have a particular specialization in acting as the owner's engineer for renewable energy projects.

initial concept design and feasibility studies
site selection and analysis
preparing technical specifications for engaging main contractors and procuring owner-supplied equipment
tender support and evaluation
design reviews
site support and supervision
monitoring budget and schedule

site support & supervision

Throughout the construction process, MPE can provide on-site support and supervision. Including:

inspecting contractor performance
monitoring progress
ensuring equipment is to specification and installed correctly
providing technical direction

RMS (dynamic) studies

Power systems must remain stable for a variety of disturbances, considering a wide range of dynamic responses for different equipment and system configurations. MPE can perform dynamic studies to assess the stability of any network. Our services include:

developing dynamic models for all types of equipment
creating network & controller models in DIgSILENT PowerFactory, PSS®E, PSCAD, ATP, RSCAD, and other software
simulations from 'single machine' to full power system
determining appropriate scenarios to study and performing stability studies
designing mitigation measures to improve or maintain power system stability
performing grid code compliance or grid integration studies for any generator type

EMT (transient) studies & insulation coordination

The results of the EMT studies can be used in insulation coordination procedures to define minimum insulation requirements for equipment, or to design mitigation measures such as surge arresters and sheath voltage limiters. These are designed in accordance with international standards such as IEC 60071 and IEEE C62.82.2.
We also specialise in circuit breaker transient recovery voltage (TRV) simulations to assess circuit breaker dielectric capabilities, and designing the most cost effective mitigation measures where required.
One area of particular expertise for MPE is with transient studies for HVAC connected offshore wind farms with long export cables (up to and in excess of 200 km and 275 kV), and array networks with voltages up to 66 kV.

MPE has world-class experience in conducting electromagnetic transient (EMT) studies to calculate the maximum system overvoltages due to:
fault occurrence/clearing
switching transients
harmonic resonance & transformer energisation
ferroresonance
lightning strike
very fast transients (VFTO) in GIS SF6 substations

harmonic studies

Harmonics in power systems can cause overvoltages, excessive heating of equipment, mal-operation of equipment, and poor power quality for end-users. Our comprehensive study approach considers different system configurations, equipment outages, harmonic voltage gain factors / transfer coefficients, and harmonic impedance loci or full harmonic network models. MPE offers a suite of services including:

requency domain harmonic studies to determine the likely impact of new or modified plant
compliance verification with national and international standards such as IEC 61000, IEEE 519 and UK ER G5/4 and G5/5
measurement for background harmonic assessment
incident investigation
development of harmonic standards
harmonic filter design to mitigate any issues
our speciality is harmonic studies for HVAC connected offshore wind farms (>200 km)

grid connection of offshore wind farms

For any size of wind farm, at any distance from shore, MPE can produce a preliminary design of the entire HVAC or HVDC grid connection of your offshore wind farm including:

Export cable selection & onshore cable routing
Transformer selection
Reactive compensation
Harmonic filtering requirements
On and offshore substation design
Budgetary estimates
Comparison of AC and DC options
Grid code compliance studies
Yield calculation and CBA of option
Together with our close partner network we can also deliver a package including offshore cable routing and geo-technical investigations.

let's talk

If you have a question about our services, or would like to talk about how we can help with one of your projects then please use the form below, or use the email addresses on our say hello page. Both methods send your query to the same location, where we will find the right person to respond to you as soon as possible: