Version 3.2.2 is backward compatible to version 3.2.1, that is models developed with versions 3.0, 3.0.1, 3.1, 3.2, or 3.2.1 will work without any changes also with version 3.2.2 (with exception of the, usually uncritical, nonbackwards compatible changes listed below with regards to external object libraries, and one bug fix introduced in 3.2.1 Build.3 for noncircular pipes that can be nonbackwards compatible if a user constructed a new pipe model based on Modelica.Fluid.Pipes.BaseClasses.WallFriction.PartialWallFriction, see details below).
The exact difference between package Modelica version 3.2.2 and version 3.2.1 is summarized in the following two comparison tables:
This release of package Modelica, and the accompanying ModelicaTest, has been tested with the following tools (the tools are listed alphabetically. At the time of the test, some of the tools might not yet supported the complete Modelica package. For more details of the tests see #1867):
The following Modelica packages have been tested that they work together with this release of package Modelica (alphabetical list):
The following new
libraries have been added:
Modelica.Electrical.PowerConverters  This library offers models for rectifiers, inverters and
DC/DCconverters. (This library was developed by Christian Kral and Anton Haumer). 
Modelica.Magnetic.QuasiStatic.FundamentalWave  This library provides quasistatic models of multiphase
machines (induction machines, synchronous machines) in parallel
(with the same parameters but different electric connectors) to the
transient models in Modelica.Magnetic.FundamentalWave. Quasistatic means that electric transients are neglected, voltages and currents are supposed to be sinusoidal. Mechanical and thermal transients are taken into account. This library is especially useful in combination with the Modelica.Electrical.QuasiStationary library in order to build up very fast simulations of electrical circuits with sinusoidal currents and voltages. (This library was developed by Christian Kral and Anton Haumer). 
Sublibraries of Modelica.Magnetic.FluxTubes  New elements for modeling ferromagnetic (static) and eddy
current (dynamic) hysteresis effects and permanent magnets have
been added. The FluxTubes.Material package is also extended to
provide hysteresis data for several magnetic materials. These data
is partly based on own measurements. For modeling of ferromagnetic
hysteresis, two different hysteresis models have been implemented:
The simple Tellinen model and the considerably more detailed
Preisach hysteresis model. The following packages have been added:

Sublibraries for noise modeling  Several new sublibraries have been added allowing the modeling of reproducible noise. The most important new sublibraries are (for more details see below): (These extensions have been developed by Andreas Klöckner, Frans van der Linden, Dirk Zimmer, and Martin Otter from DLR Institute of System Dynamics and Control). 
Modelica.Utilities functions for matrix read/write  New functions are provided in the Modelica.Utilities.Streams
sublibrary to write matrices in MATLAB MAT format on file and read
matrices in this format from file. The MATLAB MAT formats v4, v6,
v7 and v7.3 (in case the tool supports HDF5) are supported by these
functions. Additionally, example models are provided under Modelica.Utilities.Examples
to demonstrate the usage of these functions in models. For more
details see below. (These extensions have been developed by Thomas Beutlich from ITI GmbH). 
Modelica.Math sublibrary for FFT  The new sublibrary FastFourierTransform
provides utility and convenience functions to compute the Fast
Fourier Transform (FFT). Additionally two examples are present to
demonstrate how to compute an FFT during continuoustime simulation
and store the result on file. For more details see below. (These extensions have been developed by Martin Kuhn and Martin Otter from DLR Institute of System Dynamics and Control). 
The following new
components have been added to existing libraries:
Modelica.Blocks.Examples  
NoiseExamples  Several examples to demonstrate the usage of the blocks in the new sublibrary Blocks.Noise. 
Modelica.Blocks.Interfaces  
PartialNoise  Partial noise generator (base class of the noise generators in Blocks.Noise) 
Modelica.Blocks.Math  
ContinuousMean  Calculates the empirical expectation (mean) value of its input signal 
Variance  Calculates the empirical variance of its input signal 
StandardDeviation  Calculates the empirical standard deviation of its input signal 
Modelica.Blocks.Noise  
GlobalSeed  Defines global settings for the blocks of sublibrary Noise, especially a global seed value is defined 
UniformNoise  Noise generator with uniform distribution 
NormalNoise  Noise generator with normal distribution 
TruncatedNormalNoise  Noise generator with truncated normal distribution 
BandLimitedWhiteNoise  Noise generator to produce bandlimited white noise with normal distribution 
Modelica.ComplexBlocks.Examples  
ShowTransferFunction  Example to demonstrate the usage of the block TransferFunction. 
Modelica.ComplexBlocks.ComplexMath  
TransferFunction  This block allows to define a complex transfer function (depending on frequency input w) to obtain the complex output y. 
Modelica.ComplexBlocks.Sources  
LogFrequencySweep  The logarithm of w performs a linear ramp from log10(wMin) to log10(wMax), the output is the decimal power of this logarithmic ramp. 
Modelica.Electrical.Machines.Examples  
ControlledDCDrives  Current, speed and position controlled DC PM drive 
Modelica.Mechanics.Rotational.Examples.Utilities.  
SpringDamperNoRelativeStates  Introduced to fix ticket 1375 
Modelica.Mechanics.Rotational.Components.  
ElastoBacklash2  Alternative model of backlash. The difference to the existing ElastoBacklash component is that an event is generated when contact occurs and that the contact torque changes discontinuously in this case. For some user models, this variant of a backlash model leads to significantly faster simulations. 
Modelica.Fluid.Examples.  
NonCircularPipes  Introduced to check the fix of ticket 1681 
Modelica.Media.Examples.  
PsychrometricData  Introduced to fix ticket 1679 
Modelica.Math.Matrices.  
balanceABC  Return a balanced form of a system [A,B;C,0] to improve its condition by a state transformation 
Modelica.Math.Random.Generators.  
Xorshift64star  Random number generator xorshift64* 
Xorshift128plus  Random number generator xorshift128+ 
Xorshift1024star  Random number generator xorshift1024* 
Modelica.Math.Random.Utilities.  
initialStateWithXorshift64star  Return an initial state vector for a random number generator (based on xorshift64star algorithm) 
automaticGlobalSeed  Creates an automatic integer seed from the current time and process id (= impure function) 
initializeImpureRandom  Initializes the internal state of the impure random number generator 
impureRandom  Impure random number generator (with hidden state vector) 
impureRandomInteger  Impure random number generator for integer values (with hidden state vector) 
Modelica.Math.Distributions.  
Uniform  Library of uniform distribution functions (functions: density, cumulative, quantile) 
Normal  Library of normal distribution functions (functions: density, cumulative, quantile) 
TruncatedNormal  Library of truncated normal distribution functions (functions: density, cumulative, quantile) 
Weibull  Library of Weibull distribution functions (functions: density, cumulative, quantile) 
TruncatedWeibull  Library of truncated Weibull distribution functions (functions: density, cumulative, quantile) 
Modelica.Math.Special.  
erf  Error function erf(u) = 2/sqrt(pi)*Integral_0_u exp(t^2)*d 
erfc  Complementary error function erfc(u) = 1  erf(u) 
erfInv  Inverse error function: u = erf(erfInv(u)) 
erfcInv  Inverse complementary error function: u = erfc(erfcInv(u)) 
sinc  Unnormalized sinc function: sinc(u) = sin(u)/u 
Modelica.Math.FastFourierTransform.  
realFFTinfo  Print information about real FFT for given f_max and f_resolution 
realFFTsamplePoints  Return number of sample points for a real FFT 
realFFT  Return amplitude and phase vectors for a real FFT 
Modelica.Utilities.Streams.  
readMatrixSize  Read dimensions of a Real matrix from a MATLAB MAT file 
readRealMatrix  Read Real matrix from MATLAB MAT file 
writeRealMatrix  Write Real matrix to a MATLAB MAT file 
Modelica.Utilities.Strings.  
hashString  Creates a hash value of a String 
Modelica.Utilities.System.  
getTime  Retrieves the local time (in the local time zone) 
getPid  Retrieves the current process id 
The following existing
components have been changed in a nonbackward compatible way:
Electrical.Analog.Semiconductors.  
HeatingDiode  Removed protected variable k "Boltzmann's constant". Calculate protected constant q "Electron charge" from already known constants instead of defining a protected variable q. 
HeatingNPN HeatingPNP 
Removed parameter K "Boltzmann's constant" and q "Elementary
electronic charge". Calculate instead protected constant q "Electron charge" from already known constants. Users that have used these parameters might have broken their models; the (although formal nonbackwards compatible) change offers the users a safer use. 